CA1317721C - Universal cold runner block - Google Patents
Universal cold runner blockInfo
- Publication number
- CA1317721C CA1317721C CA000610599A CA610599A CA1317721C CA 1317721 C CA1317721 C CA 1317721C CA 000610599 A CA000610599 A CA 000610599A CA 610599 A CA610599 A CA 610599A CA 1317721 C CA1317721 C CA 1317721C
- Authority
- CA
- Canada
- Prior art keywords
- drop holes
- cold runner
- mold
- runner block
- nozzles
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000012530 fluid Substances 0.000 claims abstract description 53
- 239000012778 molding material Substances 0.000 claims abstract description 37
- 238000004891 communication Methods 0.000 claims abstract description 36
- 230000006854 communication Effects 0.000 claims abstract description 36
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 238000001746 injection moulding Methods 0.000 claims description 9
- 230000000903 blocking effect Effects 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims 3
- 230000037431 insertion Effects 0.000 claims 3
- 238000000465 moulding Methods 0.000 description 7
- 229940090044 injection Drugs 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 208000015943 Coeliac disease Diseases 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2616—Moulds having annular mould cavities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2725—Manifolds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2101/00—Use of unspecified macromolecular compounds as moulding material
- B29K2101/10—Thermosetting resins
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
UNIVERSAL COLD RUNNER BLOCK
A cold runner block (38) has spaced drop holes (54) arranged in a selected pattern for supplying fluid molding material to nozzles (60) con-nected to the mold gates (62). The drop holes (54) open on nozzle runners (52) in the cold runner block (38) which are in communication with a source of fluid molding material. Close-off rods (68) are selectively positioned in the runners (52) to block the flow of fluid molding material beyond the drop holes (54) communicating with a mold (12) for an object of a particular size and shape. Drop hole plugs (66) are provided for the drop holes (54) which open on the nozzle runners (52) in the section of the runners (52) not blocked by the close-off rods (68).
UNIVERSAL COLD RUNNER BLOCK
A cold runner block (38) has spaced drop holes (54) arranged in a selected pattern for supplying fluid molding material to nozzles (60) con-nected to the mold gates (62). The drop holes (54) open on nozzle runners (52) in the cold runner block (38) which are in communication with a source of fluid molding material. Close-off rods (68) are selectively positioned in the runners (52) to block the flow of fluid molding material beyond the drop holes (54) communicating with a mold (12) for an object of a particular size and shape. Drop hole plugs (66) are provided for the drop holes (54) which open on the nozzle runners (52) in the section of the runners (52) not blocked by the close-off rods (68).
Description
UNIVERSAL COLD RUNNER BLOCK
This invention relates to injection molding objects having different sizes and shapes such as ring members and especially tire treads where it is desirable to use the same cold runner 1olock for different diameter treads. HeretoEore it has been necessary to use a dif:Eerent cold runner block for tread molds of different: diameters. This has increased the cost of molding the treads and also required sorage space for storing the cold runner blocks.
The present invention provides a universal cold runner block having drop holes at different diameters opening on nozzle runners for supplying the fluid molding material to nozzles which are connected to the gates of the mold. Close-off rods are provid-ed to block the nozzle runners at positions adjacent the drop holes for the particular size tread mold.
Close-off plugs are provided for closing drop holes for other diameter treads which open on the sections of the runners not closed of:E by the close-off rods.
In accordance with an aspect oE this inven-tion there is provided an injection mold universal ~5 cold runner block for injection molding objects having different shapes or sizes with different size molds comprising:
(a) a plate member;
(b) fluid passages in the plate member for the circulation of temperature moderating fluids;
(c) a manifold in the plate member for receiving and distributing fluid molding material;
(d) a supply runner extending from the manifold to a location outside the plate member for 1 31 77~1 communication with a source of the fluid molding material;
(e) a plurality of spaced drop holes in the plate member arranged for communication with nozzles for the molds disposed between the plate member and one of the different size molds for the objects of different shapes or sizes.
(f) nozzle runners in the plate member extending Erom the manifold to at least one edge oE
the plate member and to positions adjacent the drop holes to communica-te the Eluid molding material to the nozzles;
(g) close-off rods for selectively closing off portions of the nozzle runners; and (h) at least one of the close-oEf rods being fastened to the plate member in a position adjacent one of the drop holes in communi.cation with one of the nozzles for one of the molds to direct the fluid molding material into the one of the molds through the one of the nozzles.
In accordance with another aspect of this invention there is provided an apparatus for injec-tion molding tire treads of different diameters comprising a generally cylindrical mold having a mold cavity for a tire tread of a predetermined diameter, a plurality of inlet gates in the mold in connection with the mold cavity, a cold runner block member connected to the mold, a central manifold at a central portion of the block member for receiving and distributing a fluid molding material, a supply runner extending from the manifold to an edge of said cold runner block member for communication with a source of the Eluid molding material, a plurality of A
circumferentially spaced drop holes in the cold runner block member arranged in generally circular portions about the manifold at different diameters for communication with nozzles mounted between the block member and the mold, the drop holes being positioned in the generally circular portions so that at least some of the drop holes in one of the circular portions are in alignment with some of the drop holes in another of the circular portions, nozzle runners in the block member extending from the manifold to a radially ou-tside edge of the cold runner block, each of the nozzle runners extending to positions adjacent the drop holes to com~unica-te the fluid molding material to the nozzles, and close-oEf rods Eastened to the cold runner block member in positions adjacent the drop holes at one of the circular portions to block the nozzle runners and direct the fluid molding material into the drop holes and through the nozzles to the inlet gates of the mold, and the nozzles and the cold runner block being cooled whereby the Eluid molding material remaining in the nozzles and in the cold runner block is prevented from curing so that the cured fluid molding material remaining in the mold is removable after curing of the tire tread.
In accordance with a further aspect of this invention there is provided a method of injection molding objects of different shapes and sizes with a universal cold runner block having fluid passages in the cold runner block for the circulation of temperature moderating fluid, a manifold in the cold runner block, a supply runner extending from the manifold to a location outside the cold runner block, a plurality of spaced drop holes in the cold runner A
1 31 77~1 block arranged for communication with nozzles disposed between the cold runner block and gates of different size molds for the objects of different shapes and sizes, nozzle runners in the cold runner block extending from the manifold to positions adjacent the drop holes comprising:
(a) mounting one of said different size molds for one of the objects of different .shapes or sizes on the universal cold runner bloc~ with at least some of the nozzles being in communication with the gates of the rnold;
(b) circulating temperature rnoderating fluid through the fluid passages in the cold runner block;
(c) blocking the nozzle runners with close-ofE rods at positions adjacent the drop holes in communication with the nozzles in communication with the gates oE the mold and closing off -the drop holes not in communication with the nozzles and the gates;
(d) communicating the -Eluid material through the supply runner -to the manifold;
(e) communicating the fluid molding material from the manifold through the nozzle runners to the drop holes and the nozzles in com~unication with the gates of the mold for filling a mold cavity of the mold;
~ f) heating the mold to cure the fluid molding material while cooling the fluid molding material in the nozzles and drop holes in communication with the gates of the mold; and (g) opening the mold and removing the one of the objects of different shapes and si~es.
Fig 1 is a fragmentary sectional view oE one half of a segmental mold moun-ted in a tire press showing the cold runner block embodying the invention with one of the nozzles positioned for injection of a tread of one diameter.
Fig 2 is a sectional view of the cold runner block taken along line 2-2 in Fig 1 with parts being broken away to show the passages for the temperature moderating fluid.
Fig 3 is a view like Fig 1 showing one of the nozzles positioned for injection of a tread of another diameter with a close-off plug inserted in one of the drop holes in the section of the nozzle runner not blocked by the close-off rod.
Fig 4 is a sectional view like Fig 1 of the cold runner block showing a modification of the invention with vertically disposed intersecting close-off rods for blocking the nozzle runners spaced from the supply runner and with one of the rods at a position adjacent one of the drop ho]es at a radially inner, generally circular, portion of the cold runner block. In this modification the supply runner is spaced circumferentially from the nozzle runner and is therefore not shown in this sectional view.
Fig 5 is a sectional view like Fig 4 showing one of the vertically disposed close-off rods blocking the nozzle runner at a position adjacent one of the drop holes in a radially outer circular por-tion of the cold runner block and showing a close-off plug inserted in a drop hole in the section of the nozzle runner not blocked by the close-off rodO
Referring to Figs 1, 2 and 3, part of an apparatus 10 for injection molding ring members such as tire treads is shown. A generally cylindrical mold 12 is fastened to a top end plate 14 of the apparatus 10 which, in this case, is a tire press. A
core 16 is mounted on the top end plate 14. Mold segments 18a and l~b, shown in Figs 1 and 3, respec-tively, have slide blocks 20a and 20b slidably mounted on slide rods 22 Eor radial movement of the segments. In the embodiment shown, eight mold segments 20a, 20b provide a continuous segmental outer tread insert 24 which defines mold cavities 26a and 26b with the surface of the core 16.
5egmental mold actuating cylinder~ 28 are supported on brackets mounted to the top end plate 14 and connected to the mold segments 18a and 18b by piston rods 30. The mold actuating cylinders 28 may be in communication with a source of fluid pressure and suitable controls for radially contracting and expanding the mold segments 20a and 20b, as desired.
A container ring 32 is mounted on a bottom hot plate 34 and has a tapered inner surface for engagement with tapered surfaces of the mold segments 18a, 18b.
The upper edge of the container ring 32 may have slots for the piston rods 30 and extends within a tapered register 36 of the top end plate 14 providing a register for seating the container ring and holding it in position during the molding proaess.
The bottom hot plate 34 is supported on a cold runner block 38 insulated from the bottom hot plate 34 by suitable insulation 40. The cold runner block 38 may be supported on a vertically movable plate of the press (not shown).
The cold runner block 38 is a generally flat plate member having fluid passages 42 in communication with a suitable source of temperature moderating fluid such as water. A central manifold 4~ is provided at a cen-tral portion of the cold runner block 38 and is connected to a conduit 46 at an edge of the cold runner block by a supply runner 48 extending from the manifold to the conduit. The conduit 46 may be mounted in a connecting block 50 fastened to the edge of the cold runner block 38 and positioned for engagement with a source of fluid molding material such as an injection molding machine (not shol~n).
Nozzle runners 52 in the cold runner block 38 extend from the central manifold 44 to at least one edge of the cold runner block and are in com-munication ~ith drop holes 54 circumferentiallyspaced in the cold runner block in generally circular portions 56 and 58 having different diameters.
Cooled nozzles 60 are attached to the cold runner block 38 and are in communication with the drop holes 54. The cooled nozzles 60 are also connected to cir-cumferentially spaced gates 62 along at least one side of the mold cavity 26a and 26b by tapered sprues 64. The fluid molding ~aterial remaining in the cooled nozzles 60 and in the nozzle runners 52 and supply runner 48 is prevented from curing. The cured fluid molding material in the gates 62 and sprues 64 is removable after curing of the treads in the mold cavities 26 and 26b.
~eferring to Figs l and 2, the mold cavity 26a is for molding a tread ring having a diameter A
which corresponds with the drop holes 54 in the cir-cular portion 56. Close-off means for directing the fluid molding material from the manifold 44 to the drop holes 54 include plug members 66 and close-off rods 68. In the embodiment shown in Fig 1 and 2, the plug members 66 are mounted on the cold runner block 38 and close the drop holes 54 in the circular por-tion 58 between the manifo]d 44 and the drop holes 54 in the circular portion 56. The close off rods 68 have substantially the same diameter as the nozzle runners 52 and are slidable into the nozzle runners to a position adjacent the drop holes 5~ in the cir-cular portion 56. The c:Lose-off rods 68 may have threaded portions 70 for threaded engagement with threads in the nozzle runners 52 to hold the rods in position. An opening 72 may be provided in the con-necting block 50 through which one of the close~off rods 68 is inserted into one of the nozzle runners 52 which leads to the connecting block.
When it is desired to injection mold tread rings of a smaller diameter B into the mold cavity 26b, as shown in Fig 3, longer close-off rods 74 are slidably inserted in the nozzle runners 52 and are of a length to block the nozzle runners at positions adjacent the drop holes 54 in the circular portion 58. The plug members 66 are removed and the cooled nozzles 60 mounted for communicating the fluid molding material through the sprues 64 to the gates 62 of the mold cavity 26b. The mold segments 18b are also substituted for the mold segments 18a.
In operation of the apparatus 10, shown in Figs 1, 2 and 3, the segmental molds 12 are closed by closing the tire press and applying a clamping pressure which is preferably from 600 to 1000 tons (609.62 to 1016 metric tons~. Heating of the segmen-tal molds 12 may be provided by heating passages (not g shown) in communication with a suitable heating means such as steam. The molds 12 are heated to a rela-tively high temperature in the range from 300F to 400~F (149C to 204C) and preferably to around 340F
(171C). The curing time of the ring treads in the mold cavities 26a and 26b may be from one and one-half to eight minutes, depending upon the curing properties of the injected rubber, the temperature of the segmental molds 12 and the thickness of the ring treads which may be in the range of ~rom 12/32 to one inch (0.95 to 2.54cm).
Vacuum passages (not shown) may be provided in the segmental mold 12 in communication with the mold cavities 26a and 26b. Also a bumping cycle may be used if required. The cold runner block 38 is cooled by circulating a suitable cooling medium through the fluid passages 42 and around the no~zles 60. For e~ample, water, which may be in the range of 160F to 260F (71C to 127C), and preferably around 220F (104C) at 80 psi (5.62 kg/cm2) may be used.
The temperature of the cold runner block 38 is main-tained between 200F and 280F (93C to 138C) for optimum results. After injection and curing of the treads in the mold cavities 26a and 26b, the press is opened by separating the cold runner block 38 from the top end plate 14 whereupon the container ring 32 is moved away from the mold segments 18a and 18b so that the segments and the outer tread insert 24 may be pulled away from the core 16 by retracting the piston rods 30 into the mold actuating cylinders 28.
The tread can then be removed in a manner well known to those skilled art.
Referring to Figs 4 and 5, a modification of the cold runner block 38' is shown in which all of -lo-l3l772l the parts are identical with the parts of the cold runner block shown in Figs 1, 2 and 3 except close-off rods 76, 77 and 78 are used instead of the close-off rods 68 and 74~ Also the supply runner 48 is not in the same plane as any of the nozzle runners 52'.
In describing the construction of the modification shown in Figs 4 and 5, those parts, which are iden~
tical with the parts of the cold runner block 38 shown in Figs 1, 2 and 3, will be identified with the same number and a prime mar]~. As shown in Fig 4, the drop holes 54' in comm~lnication with the nozzles 60' for molding a tread with a diameter A open on the nozzle runner 52'. Adjacent the drop holes 54' are elongated holes 80 in the cold runner block 38' intersecting the nozzle runners 52'. The close-off rods 76 are slidably inserted in the elongated holes 80 and project into the nozzle runners 52' at posi-tions adjacent the drop holes 54' in the circular portion 56'. Plug members 66' are mounted on the cold runner block 38' to block the drop holes 54' and prevent movement of the fluid molding material through the drop holes. Second elongated holes 82 are provided in the cold runner block 38' at posi-tions adjacent the drop hole 54' in the circular por-tion 58' and in this case the holes are filled withthe close-off rods 78 which have a length terminating at the side of the no~zle passage 52' so that the fluid molding material can flow by the plug members 66' and the close-off rods 78 for communication with the nozzles 60'.
Referring to Fig 5, the cold runner block 38' has the nozzles 60' located in the circular por-tion 58' for communication with the mold cavity 26b for molding tread rings having diameter B. Close-off rods 77 having a length the same as the close-off rods 76 are slidably inserted in the elongated holes 82 to block the nozzle runners 52'. The operation of the apparatus 10 with the cold runner block 38' shown in Figs 4 and 5 is substantially the same as the operation described hereinabove for the cold runner block shown in Figs 1, 2 and 3.
It can be seen that the drop holes 54 and 54', which are located in the circular portions 56, 56', 58 and 58' may be located in other circular por-tions having lesser or greater diameters. Also, additional drop holes 54 and 54' may be added in cir-cular portions having other diameters in a manner such as that described for the embodiments shown in the drawings. Although the invention has been applied to circular objects such as tire molds, it is applicable to universal cold runner blocks for molding other objects. This can be accomplished by arranging the drop holes in a selected pattern in communication with nozzle runners positioned for com-munication with a manifold and the drop holes.
While certain representative eillbodiments and details have been shown for the purpose of illustrating the invention, it will be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the spirit or scope of the invention.
This invention relates to injection molding objects having different sizes and shapes such as ring members and especially tire treads where it is desirable to use the same cold runner 1olock for different diameter treads. HeretoEore it has been necessary to use a dif:Eerent cold runner block for tread molds of different: diameters. This has increased the cost of molding the treads and also required sorage space for storing the cold runner blocks.
The present invention provides a universal cold runner block having drop holes at different diameters opening on nozzle runners for supplying the fluid molding material to nozzles which are connected to the gates of the mold. Close-off rods are provid-ed to block the nozzle runners at positions adjacent the drop holes for the particular size tread mold.
Close-off plugs are provided for closing drop holes for other diameter treads which open on the sections of the runners not closed of:E by the close-off rods.
In accordance with an aspect oE this inven-tion there is provided an injection mold universal ~5 cold runner block for injection molding objects having different shapes or sizes with different size molds comprising:
(a) a plate member;
(b) fluid passages in the plate member for the circulation of temperature moderating fluids;
(c) a manifold in the plate member for receiving and distributing fluid molding material;
(d) a supply runner extending from the manifold to a location outside the plate member for 1 31 77~1 communication with a source of the fluid molding material;
(e) a plurality of spaced drop holes in the plate member arranged for communication with nozzles for the molds disposed between the plate member and one of the different size molds for the objects of different shapes or sizes.
(f) nozzle runners in the plate member extending Erom the manifold to at least one edge oE
the plate member and to positions adjacent the drop holes to communica-te the Eluid molding material to the nozzles;
(g) close-off rods for selectively closing off portions of the nozzle runners; and (h) at least one of the close-oEf rods being fastened to the plate member in a position adjacent one of the drop holes in communi.cation with one of the nozzles for one of the molds to direct the fluid molding material into the one of the molds through the one of the nozzles.
In accordance with another aspect of this invention there is provided an apparatus for injec-tion molding tire treads of different diameters comprising a generally cylindrical mold having a mold cavity for a tire tread of a predetermined diameter, a plurality of inlet gates in the mold in connection with the mold cavity, a cold runner block member connected to the mold, a central manifold at a central portion of the block member for receiving and distributing a fluid molding material, a supply runner extending from the manifold to an edge of said cold runner block member for communication with a source of the Eluid molding material, a plurality of A
circumferentially spaced drop holes in the cold runner block member arranged in generally circular portions about the manifold at different diameters for communication with nozzles mounted between the block member and the mold, the drop holes being positioned in the generally circular portions so that at least some of the drop holes in one of the circular portions are in alignment with some of the drop holes in another of the circular portions, nozzle runners in the block member extending from the manifold to a radially ou-tside edge of the cold runner block, each of the nozzle runners extending to positions adjacent the drop holes to com~unica-te the fluid molding material to the nozzles, and close-oEf rods Eastened to the cold runner block member in positions adjacent the drop holes at one of the circular portions to block the nozzle runners and direct the fluid molding material into the drop holes and through the nozzles to the inlet gates of the mold, and the nozzles and the cold runner block being cooled whereby the Eluid molding material remaining in the nozzles and in the cold runner block is prevented from curing so that the cured fluid molding material remaining in the mold is removable after curing of the tire tread.
In accordance with a further aspect of this invention there is provided a method of injection molding objects of different shapes and sizes with a universal cold runner block having fluid passages in the cold runner block for the circulation of temperature moderating fluid, a manifold in the cold runner block, a supply runner extending from the manifold to a location outside the cold runner block, a plurality of spaced drop holes in the cold runner A
1 31 77~1 block arranged for communication with nozzles disposed between the cold runner block and gates of different size molds for the objects of different shapes and sizes, nozzle runners in the cold runner block extending from the manifold to positions adjacent the drop holes comprising:
(a) mounting one of said different size molds for one of the objects of different .shapes or sizes on the universal cold runner bloc~ with at least some of the nozzles being in communication with the gates of the rnold;
(b) circulating temperature rnoderating fluid through the fluid passages in the cold runner block;
(c) blocking the nozzle runners with close-ofE rods at positions adjacent the drop holes in communication with the nozzles in communication with the gates oE the mold and closing off -the drop holes not in communication with the nozzles and the gates;
(d) communicating the -Eluid material through the supply runner -to the manifold;
(e) communicating the fluid molding material from the manifold through the nozzle runners to the drop holes and the nozzles in com~unication with the gates of the mold for filling a mold cavity of the mold;
~ f) heating the mold to cure the fluid molding material while cooling the fluid molding material in the nozzles and drop holes in communication with the gates of the mold; and (g) opening the mold and removing the one of the objects of different shapes and si~es.
Fig 1 is a fragmentary sectional view oE one half of a segmental mold moun-ted in a tire press showing the cold runner block embodying the invention with one of the nozzles positioned for injection of a tread of one diameter.
Fig 2 is a sectional view of the cold runner block taken along line 2-2 in Fig 1 with parts being broken away to show the passages for the temperature moderating fluid.
Fig 3 is a view like Fig 1 showing one of the nozzles positioned for injection of a tread of another diameter with a close-off plug inserted in one of the drop holes in the section of the nozzle runner not blocked by the close-off rod.
Fig 4 is a sectional view like Fig 1 of the cold runner block showing a modification of the invention with vertically disposed intersecting close-off rods for blocking the nozzle runners spaced from the supply runner and with one of the rods at a position adjacent one of the drop ho]es at a radially inner, generally circular, portion of the cold runner block. In this modification the supply runner is spaced circumferentially from the nozzle runner and is therefore not shown in this sectional view.
Fig 5 is a sectional view like Fig 4 showing one of the vertically disposed close-off rods blocking the nozzle runner at a position adjacent one of the drop holes in a radially outer circular por-tion of the cold runner block and showing a close-off plug inserted in a drop hole in the section of the nozzle runner not blocked by the close-off rodO
Referring to Figs 1, 2 and 3, part of an apparatus 10 for injection molding ring members such as tire treads is shown. A generally cylindrical mold 12 is fastened to a top end plate 14 of the apparatus 10 which, in this case, is a tire press. A
core 16 is mounted on the top end plate 14. Mold segments 18a and l~b, shown in Figs 1 and 3, respec-tively, have slide blocks 20a and 20b slidably mounted on slide rods 22 Eor radial movement of the segments. In the embodiment shown, eight mold segments 20a, 20b provide a continuous segmental outer tread insert 24 which defines mold cavities 26a and 26b with the surface of the core 16.
5egmental mold actuating cylinder~ 28 are supported on brackets mounted to the top end plate 14 and connected to the mold segments 18a and 18b by piston rods 30. The mold actuating cylinders 28 may be in communication with a source of fluid pressure and suitable controls for radially contracting and expanding the mold segments 20a and 20b, as desired.
A container ring 32 is mounted on a bottom hot plate 34 and has a tapered inner surface for engagement with tapered surfaces of the mold segments 18a, 18b.
The upper edge of the container ring 32 may have slots for the piston rods 30 and extends within a tapered register 36 of the top end plate 14 providing a register for seating the container ring and holding it in position during the molding proaess.
The bottom hot plate 34 is supported on a cold runner block 38 insulated from the bottom hot plate 34 by suitable insulation 40. The cold runner block 38 may be supported on a vertically movable plate of the press (not shown).
The cold runner block 38 is a generally flat plate member having fluid passages 42 in communication with a suitable source of temperature moderating fluid such as water. A central manifold 4~ is provided at a cen-tral portion of the cold runner block 38 and is connected to a conduit 46 at an edge of the cold runner block by a supply runner 48 extending from the manifold to the conduit. The conduit 46 may be mounted in a connecting block 50 fastened to the edge of the cold runner block 38 and positioned for engagement with a source of fluid molding material such as an injection molding machine (not shol~n).
Nozzle runners 52 in the cold runner block 38 extend from the central manifold 44 to at least one edge of the cold runner block and are in com-munication ~ith drop holes 54 circumferentiallyspaced in the cold runner block in generally circular portions 56 and 58 having different diameters.
Cooled nozzles 60 are attached to the cold runner block 38 and are in communication with the drop holes 54. The cooled nozzles 60 are also connected to cir-cumferentially spaced gates 62 along at least one side of the mold cavity 26a and 26b by tapered sprues 64. The fluid molding ~aterial remaining in the cooled nozzles 60 and in the nozzle runners 52 and supply runner 48 is prevented from curing. The cured fluid molding material in the gates 62 and sprues 64 is removable after curing of the treads in the mold cavities 26 and 26b.
~eferring to Figs l and 2, the mold cavity 26a is for molding a tread ring having a diameter A
which corresponds with the drop holes 54 in the cir-cular portion 56. Close-off means for directing the fluid molding material from the manifold 44 to the drop holes 54 include plug members 66 and close-off rods 68. In the embodiment shown in Fig 1 and 2, the plug members 66 are mounted on the cold runner block 38 and close the drop holes 54 in the circular por-tion 58 between the manifo]d 44 and the drop holes 54 in the circular portion 56. The close off rods 68 have substantially the same diameter as the nozzle runners 52 and are slidable into the nozzle runners to a position adjacent the drop holes 5~ in the cir-cular portion 56. The c:Lose-off rods 68 may have threaded portions 70 for threaded engagement with threads in the nozzle runners 52 to hold the rods in position. An opening 72 may be provided in the con-necting block 50 through which one of the close~off rods 68 is inserted into one of the nozzle runners 52 which leads to the connecting block.
When it is desired to injection mold tread rings of a smaller diameter B into the mold cavity 26b, as shown in Fig 3, longer close-off rods 74 are slidably inserted in the nozzle runners 52 and are of a length to block the nozzle runners at positions adjacent the drop holes 54 in the circular portion 58. The plug members 66 are removed and the cooled nozzles 60 mounted for communicating the fluid molding material through the sprues 64 to the gates 62 of the mold cavity 26b. The mold segments 18b are also substituted for the mold segments 18a.
In operation of the apparatus 10, shown in Figs 1, 2 and 3, the segmental molds 12 are closed by closing the tire press and applying a clamping pressure which is preferably from 600 to 1000 tons (609.62 to 1016 metric tons~. Heating of the segmen-tal molds 12 may be provided by heating passages (not g shown) in communication with a suitable heating means such as steam. The molds 12 are heated to a rela-tively high temperature in the range from 300F to 400~F (149C to 204C) and preferably to around 340F
(171C). The curing time of the ring treads in the mold cavities 26a and 26b may be from one and one-half to eight minutes, depending upon the curing properties of the injected rubber, the temperature of the segmental molds 12 and the thickness of the ring treads which may be in the range of ~rom 12/32 to one inch (0.95 to 2.54cm).
Vacuum passages (not shown) may be provided in the segmental mold 12 in communication with the mold cavities 26a and 26b. Also a bumping cycle may be used if required. The cold runner block 38 is cooled by circulating a suitable cooling medium through the fluid passages 42 and around the no~zles 60. For e~ample, water, which may be in the range of 160F to 260F (71C to 127C), and preferably around 220F (104C) at 80 psi (5.62 kg/cm2) may be used.
The temperature of the cold runner block 38 is main-tained between 200F and 280F (93C to 138C) for optimum results. After injection and curing of the treads in the mold cavities 26a and 26b, the press is opened by separating the cold runner block 38 from the top end plate 14 whereupon the container ring 32 is moved away from the mold segments 18a and 18b so that the segments and the outer tread insert 24 may be pulled away from the core 16 by retracting the piston rods 30 into the mold actuating cylinders 28.
The tread can then be removed in a manner well known to those skilled art.
Referring to Figs 4 and 5, a modification of the cold runner block 38' is shown in which all of -lo-l3l772l the parts are identical with the parts of the cold runner block shown in Figs 1, 2 and 3 except close-off rods 76, 77 and 78 are used instead of the close-off rods 68 and 74~ Also the supply runner 48 is not in the same plane as any of the nozzle runners 52'.
In describing the construction of the modification shown in Figs 4 and 5, those parts, which are iden~
tical with the parts of the cold runner block 38 shown in Figs 1, 2 and 3, will be identified with the same number and a prime mar]~. As shown in Fig 4, the drop holes 54' in comm~lnication with the nozzles 60' for molding a tread with a diameter A open on the nozzle runner 52'. Adjacent the drop holes 54' are elongated holes 80 in the cold runner block 38' intersecting the nozzle runners 52'. The close-off rods 76 are slidably inserted in the elongated holes 80 and project into the nozzle runners 52' at posi-tions adjacent the drop holes 54' in the circular portion 56'. Plug members 66' are mounted on the cold runner block 38' to block the drop holes 54' and prevent movement of the fluid molding material through the drop holes. Second elongated holes 82 are provided in the cold runner block 38' at posi-tions adjacent the drop hole 54' in the circular por-tion 58' and in this case the holes are filled withthe close-off rods 78 which have a length terminating at the side of the no~zle passage 52' so that the fluid molding material can flow by the plug members 66' and the close-off rods 78 for communication with the nozzles 60'.
Referring to Fig 5, the cold runner block 38' has the nozzles 60' located in the circular por-tion 58' for communication with the mold cavity 26b for molding tread rings having diameter B. Close-off rods 77 having a length the same as the close-off rods 76 are slidably inserted in the elongated holes 82 to block the nozzle runners 52'. The operation of the apparatus 10 with the cold runner block 38' shown in Figs 4 and 5 is substantially the same as the operation described hereinabove for the cold runner block shown in Figs 1, 2 and 3.
It can be seen that the drop holes 54 and 54', which are located in the circular portions 56, 56', 58 and 58' may be located in other circular por-tions having lesser or greater diameters. Also, additional drop holes 54 and 54' may be added in cir-cular portions having other diameters in a manner such as that described for the embodiments shown in the drawings. Although the invention has been applied to circular objects such as tire molds, it is applicable to universal cold runner blocks for molding other objects. This can be accomplished by arranging the drop holes in a selected pattern in communication with nozzle runners positioned for com-munication with a manifold and the drop holes.
While certain representative eillbodiments and details have been shown for the purpose of illustrating the invention, it will be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the spirit or scope of the invention.
Claims (12)
1. An injection mold universal cold runner block for injection molding objects having different shapes or sizes with different size molds comprising:
(a) a plate member;
(b) fluid passages in said plate member for the circulation of temperature moderating fluids;
(c) a manifold in said plate member for receiving and distributing fluid molding material;
(d) a supply runner extending from said manifold to a location outside said plate member for communication with a source of said fluid molding material;
(e) a plurality of spaced drop holes in said plate member arranged for communication with nozzles for said molds disposed between said plate member and one of said different size molds for said objects of different shapes or sizes;
(f) nozzle runners in said plate member extending from said manifold to at least one edge of said plate member and to positions adjacent said drop holes to communicate said fluid molding material to said nozzles;
(g) close-off rods for selectively closing off portions of said nozzle runners; and (h) at least one of said close-off rods being fastened to said plate member in a position adjacent one of said drop holes in communication with one of said nozzles for one of said molds to direct said fluid molding material into said one of said molds through said one of said nozzles.
(a) a plate member;
(b) fluid passages in said plate member for the circulation of temperature moderating fluids;
(c) a manifold in said plate member for receiving and distributing fluid molding material;
(d) a supply runner extending from said manifold to a location outside said plate member for communication with a source of said fluid molding material;
(e) a plurality of spaced drop holes in said plate member arranged for communication with nozzles for said molds disposed between said plate member and one of said different size molds for said objects of different shapes or sizes;
(f) nozzle runners in said plate member extending from said manifold to at least one edge of said plate member and to positions adjacent said drop holes to communicate said fluid molding material to said nozzles;
(g) close-off rods for selectively closing off portions of said nozzle runners; and (h) at least one of said close-off rods being fastened to said plate member in a position adjacent one of said drop holes in communication with one of said nozzles for one of said molds to direct said fluid molding material into said one of said molds through said one of said nozzles.
2. An injection mold universal cold runner block according to Claim 1 including plug members for insertion in said drop holes opening on said nozzle runners and not in communication with said nozzles for said one of said molds for said objects.
3. An injection mold universal cold runner block according to Claim 1 wherein said one of said close-off rods is of substantially the same diameter as said nozzle runner and is slidable into said nozzle runners from an edge of said plate member to said position adjacent one of said drop holes and is fastened to said plate member by threaded engagement with threads in said nozzle runner.
4. An injection mold universal cold runner block according to Claim 1 wherein said one of said close-off rods is slidably mounted in an elongated hole in said plate member intersecting and blocking said nozzle runner at said position adjacent one of said drop holes and is fastened to said plate member by threaded engagement with threads in said elongated hole.
5. An injection mold universal cold runner block according to claim 1 wherein said objects are ring members of different diameters, said manifold is at a central portion of said plate member, said supply runner extends from an edge of said plate member to said manifold, said drop holes are arranged in generally circular portions about said manifold at said different diameters, said drop holes are positioned in said generally circular portions so that at least some of said drop holes in said circular portions are in alignment with some of said drop holes in another of said circular portions, said nozzle runners in said plate member extend from said manifold to at least one edge of said plate member, and said close-off means are positioned adjacent said drop holes at one of said circular portions to direct said fluid molding material into said drop holes in communication with said nozzles for one of said ring members of a desired diameter.
6. An injection mold universal cold runner block according to claim 5 wherein said close-off means includes plug members for insertion in said drop holes opening on said nozzle runners at said circular portions between said manifold and said drop holes adjacent said close-off rods.
7. Apparatus for injection molding tire treads of different diameters comprising a generally cylindrical mold having a mold cavity for a tire tread of a predetermined diameter, a plurality of inlet gates in said mold in connection with said mold cavity, a cold runner block member connected to said mold, a central manifold at a central portion of said block member for receiving and distributing a fluid molding material, a supply runner extending from said manifold to an edge of said cold runner block member for communication with a source of said fluid molding material, a plurality of circumferentially spaced drop holes in said cold runner block member arranged in generally circular portions about said manifold at different diameters for communication with nozzles mounted between said block member and said mold, said drop holes being positioned in said generally circular portions so that at least some of said drop holes in one of said circular portions are in align-ment with some of said drop holes in another of said circular portions, nozzle runners in said block member extending from said manifold to a radially outside edge of said cold runner block, each of said nozzle runners extending to positions adjacent said drop holes to communicate said fluid molding material to said nozzles, and close-off rods fastened to said cold runner block member in positions adjacent said drop holes at one of said circular portions to block said nozzle runners and direct said fluid molding material into said drop holes and through said nozzles to said inlet gates of said mold, and said nozzles and said cold runner block being cooled whereby said fluid molding material remaining in said nozzles and in said cold runner block is prevented from curing so that said cured fluid molding material remaining in said mold is removable after curing of said tire tread.
8. Apparatus in accordance with claim 7 wherein said close-off rods are of substantially the same diameter as said nozzle runners and are slidable into said nozzle runners from an edge of said block member to said positions adjacent said drop holes and means to fasten said close-off rods to said cold runner block in said positions including threaded engagement with threads in said nozzle runners.
9. Apparatus in accordance with claim 7 wherein said close-off rods are slidably mounted in elongated holes in said cold runner block member intersecting said nozzle runners at said positions adjacent said drop holes for blocking said nozzle runners and means to fasten said close-off rods to said cold runner block in said positions.
10. Apparatus in accordance with claim 7 including plug members for insertion in said drop holes opening on said nozzle runners at said circular portions between said manifold and said drop holes adjacent said close-off means.
11. A method of injection molding objects of different shapes and sizes with a universal cold runner block having fluid passages in said cold runner block for the circulation of temperature moderating fluid, a manifold in said cold runner block, a supply runner extending from said manifold to a location outside said cold runner block, a plurality of spaced drop holes in said cold runner block arranged for communication with nozzles disposed between said cold runner block and gates of different size molds for said objects of different shapes and sizes, nozzle runners in said cold runner block extending from said manifold to positions adjacent said drop holes comprising:
(a) mounting one of said different size molds for one of said objects of different shapes or sizes on said universal cold runner block with at least some of said nozzles being in communication with said gates of said mold;
(b) circulating temperature moderating fluid through said fluid passages in said cold runner block;
(c) blocking said nozzle runners with close-off rods at positions adjacent said drop holes in communication with said nozzles in communication with said gates of said mold and closing off said drop holes not in communication with said nozzles and said gates;
(d) communicating said fluid material through said supply runner to said manifold;
(e) communicating said fluid molding material from said manifold through said nozzle runners to said drop holes and said nozzles in communication with said gates of said mold for filling a mold cavity of said mold;
(f) heating said mold to cure said fluid molding material while cooling said fluid molding material in said nozzles and drop holes in communica-tion with said gates of said mold; and (g) opening said mold and removing said one of said objects of different shapes and sizes.
(a) mounting one of said different size molds for one of said objects of different shapes or sizes on said universal cold runner block with at least some of said nozzles being in communication with said gates of said mold;
(b) circulating temperature moderating fluid through said fluid passages in said cold runner block;
(c) blocking said nozzle runners with close-off rods at positions adjacent said drop holes in communication with said nozzles in communication with said gates of said mold and closing off said drop holes not in communication with said nozzles and said gates;
(d) communicating said fluid material through said supply runner to said manifold;
(e) communicating said fluid molding material from said manifold through said nozzle runners to said drop holes and said nozzles in communication with said gates of said mold for filling a mold cavity of said mold;
(f) heating said mold to cure said fluid molding material while cooling said fluid molding material in said nozzles and drop holes in communica-tion with said gates of said mold; and (g) opening said mold and removing said one of said objects of different shapes and sizes.
12. The method of claim 11 including the step of blocking said nozzle runners by inserting close-off rods in said nozzle runners to positions adjacent said drop holes and said nozzles in communication with said gates of said mold.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/258,385 US4980111A (en) | 1988-10-17 | 1988-10-17 | Injection molding method and apparatus using a universal cold runner block |
| US258,385 | 1988-10-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1317721C true CA1317721C (en) | 1993-05-18 |
Family
ID=22980327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000610599A Expired - Fee Related CA1317721C (en) | 1988-10-17 | 1989-09-07 | Universal cold runner block |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4980111A (en) |
| EP (1) | EP0365464B1 (en) |
| JP (1) | JPH0521387Y2 (en) |
| AU (1) | AU621155B2 (en) |
| CA (1) | CA1317721C (en) |
| DE (1) | DE68923342T2 (en) |
| ES (1) | ES2075069T3 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0757507B2 (en) * | 1991-04-25 | 1995-06-21 | 住友ゴム工業株式会社 | Injection mold |
| TW304911B (en) * | 1995-03-07 | 1997-05-11 | Ciba Sc Holding Ag | |
| US5798127A (en) * | 1995-09-15 | 1998-08-25 | The Goodyear Tire & Rubber Company | Injection molding of a tire component |
| US6379603B1 (en) | 1997-06-09 | 2002-04-30 | The Goodyear Tire & Rubber Company | Lattice gate for injection molding of rubber compounds |
| FR2775214B1 (en) * | 1998-02-26 | 2000-05-05 | Plastic Omnium Cie | METHOD FOR PRODUCING A MOTOR VEHICLE BODY PIECE BY INJECTING PLASTIC MATERIAL, METHOD FOR SEQUENTIAL INJECTION OF PLASTIC MATERIAL, MOLD USED AND PART OBTAINED |
| US6419476B1 (en) | 1998-08-25 | 2002-07-16 | Joseph P. Ouellette | Thermally insulated runner manifold and injection nozzle construction for plastic molding apparatus |
| SE524038C2 (en) * | 2001-10-10 | 2004-06-15 | Nolato Ab | Method and aggregates for injection molding and tools included in this assembly, and use of this injection molding assembly for the manufacture of mobile phone components |
| CN101031404A (en) * | 2004-07-28 | 2007-09-05 | 纳幕尔杜邦公司 | Encapsulation mold assembly and interchangeable cartridge |
| CN109648888B (en) * | 2018-12-27 | 2021-09-10 | 中国航空工业集团公司基础技术研究院 | Liquid forming method for composite material cavity block |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3231938A (en) * | 1962-01-22 | 1966-02-01 | Milton I Ross | Injection molding apparatus |
| US3807921A (en) * | 1972-03-13 | 1974-04-30 | Phillips Petroleum Co | Apparatus for manufacturing foamed plastic materials |
| GB1503668A (en) * | 1974-05-28 | 1978-03-15 | Dunlop Ltd | Manufacture of pneumatic tyres |
| DE2559461C3 (en) * | 1975-04-05 | 1980-03-06 | Sopecom S.A., Freiburg (Schweiz) | Device for the injection molding of molded bodies consisting of several parts made of different materials, in particular pneumatic vehicle tires |
| DE2514973C3 (en) * | 1975-04-05 | 1978-06-08 | Sopecom S.A., Freiburg (Schweiz) | Injection molding device for manufacturing vehicle tires |
| DE2750232A1 (en) * | 1977-11-10 | 1979-05-17 | Desma Werke Gmbh | MOLD, IN PARTICULAR INJECTION MOLD, FOR PRODUCING MOLDINGS FROM RUBBER, IN PARTICULAR APEX RINGS |
| DE2938832A1 (en) * | 1979-09-26 | 1981-04-09 | EWIKON Entwicklung und Konstruktion GmbH & Co KG, 4900 Herford | DEVICE WITH A HOT-TUBE SYSTEM FOR FEEDING A PLASTIC MELT TO AN INJECTION MOLD |
| JPS57178721A (en) * | 1981-04-27 | 1982-11-04 | Yoshida Kogyo Kk <Ykk> | Automatic regulation of molded length at injection molding |
| US4416604A (en) * | 1981-06-01 | 1983-11-22 | Associated Enterprises, Inc. | Universal molding system and method |
| CH653286A5 (en) * | 1981-07-22 | 1985-12-31 | Apparate & Werkzeugbau Ag | Multi-cavity injection mould |
| FR2542252B1 (en) * | 1983-03-10 | 1985-08-16 | Capy Gilbert | METHOD AND DEVICE FOR INJECTING PLASTIC MATERIAL INTO A MULTI-FOOTPRINT MOLD |
| US4500279A (en) * | 1983-07-06 | 1985-02-19 | Kona Corporation | Heat pipe manifold system |
| JPS6377724A (en) * | 1986-09-20 | 1988-04-07 | Nissei Plastics Ind Co | Injection molding machine |
| US4826416A (en) * | 1988-06-02 | 1989-05-02 | The Goodyear Tire & Rubber Company | System for injection molding tire treads |
-
1988
- 1988-10-17 US US07/258,385 patent/US4980111A/en not_active Expired - Lifetime
-
1989
- 1989-09-07 CA CA000610599A patent/CA1317721C/en not_active Expired - Fee Related
- 1989-10-10 DE DE68923342T patent/DE68923342T2/en not_active Expired - Fee Related
- 1989-10-10 EP EP89630188A patent/EP0365464B1/en not_active Expired - Lifetime
- 1989-10-10 ES ES89630188T patent/ES2075069T3/en not_active Expired - Lifetime
- 1989-10-16 JP JP1989119785U patent/JPH0521387Y2/ja not_active Expired - Lifetime
- 1989-10-16 AU AU42924/89A patent/AU621155B2/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| AU621155B2 (en) | 1992-03-05 |
| JPH0254518U (en) | 1990-04-19 |
| US4980111A (en) | 1990-12-25 |
| DE68923342D1 (en) | 1995-08-10 |
| EP0365464A3 (en) | 1991-05-29 |
| DE68923342T2 (en) | 1996-03-07 |
| EP0365464A2 (en) | 1990-04-25 |
| ES2075069T3 (en) | 1995-10-01 |
| EP0365464B1 (en) | 1995-07-05 |
| AU4292489A (en) | 1990-04-26 |
| JPH0521387Y2 (en) | 1993-06-01 |
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