EP1552893A1 - Device for sheet metal forming in surface critical panels - Google Patents
Device for sheet metal forming in surface critical panels Download PDFInfo
- Publication number
- EP1552893A1 EP1552893A1 EP04000331A EP04000331A EP1552893A1 EP 1552893 A1 EP1552893 A1 EP 1552893A1 EP 04000331 A EP04000331 A EP 04000331A EP 04000331 A EP04000331 A EP 04000331A EP 1552893 A1 EP1552893 A1 EP 1552893A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- forming
- sub
- forming member
- main
- forming body
- 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.)
- Granted
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/10—Stamping using yieldable or resilient pads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
Definitions
- the present invention relates to a sheet metal forming apparatus and method for preventing surface defects in a perimeter area around a local depression in a larger forming area.
- the apparatus comprises a first main forming body and a second main forming body, at least one of said main forming bodies being movable towards the other for forming a sheet metal blank there-between into a desired shape.
- the surface defects occur as a result of substantial local variations in tension around the depression as the metal is formed, which in current methods of production often leads to several permanent defects, in the form of uneven surfaces, left after the sheet metal springs back as the formed panel is released and ejected from the forming apparatus.
- the above mentioned problem is solved by the invention providing a sheet metal forming apparatus for preventing surface defects in a perimeter area around a local depression in a larger forming area.
- the apparatus comprises a first main forming body and a second main forming body, at least one of said main forming bodies being movable towards the other for forming a sheet metal blank there-between into a desired shape.
- the invention is especially characterized in:
- the forming of said local depression is adapted to be completed when the second main forming body is at a distance not exceeding 10 mm from its final abutment position.
- the forming of said local depression is adapted to be completed when the second main forming body is at a distance not exceeding 4 mm from its final abutment position.
- the first main forming body is a stationary die and the second main forming body is a movable punch.
- the sub-forming member is adapted to remain in its retracted position during ejection of a finished sheet metal part.
- the protrusion distance of the sub-forming member in its protruding position is adjustable by means of an exchangeable spacer element seated between the first main forming body and an abutment flange provided on the sub-forming member.
- the spring element is a gas spring assembly.
- it may alternatively be of another suitable kind, such as a coil spring assembly.
- the invention also includes a sheet metal forming method for preventing surface defects in a perimeter area around a local depression in a larger forming area.
- the method includes the use of a forming apparatus comprising a first main forming body and a second main forming body, at least one of said main forming bodies being movable towards the other for forming a sheet metal blank there-between into a desired shape.
- the method is especially characterized in:
- Fig. 1 part of a car door panel 1 is shown as an example of surface defects 2 around a door handle depression 4 , as produced with current, prior art production methods.
- the surface defects 2 are drawn with dashed lines in Fig. 1 and - as described initially - frequently occurs as a result of substantial local variations in tension around the depression as the metal is formed. More particularly, the undesired surface defects 2 are in the form of uneven surfaces which are left after the sheet metal springs back as the formed car door panel 1 is released and ejected from the prior art forming apparatus (not shown). It is the general object of the present invention to prevent such surface defects 2 from occurring in a perimeter area 6 around a local depression 4 - in this case the door handle depression - in a larger forming area 1 (i.e. in this case the car door panel).
- the perimeter area 6 is loosely shown in Fig. 1 with bold face dash-dotted lines.
- Fig. 2 shows a schematic cross-sectional view of a sheet metal forming apparatus 8 according to an exemplifying embodiment of the present invention.
- the view in Fig. 2 shows the apparatus 8 in an initial position, wherein a sheet metal blank 10 to be formed has been inserted between a first main forming body 12 and a second main forming body 14.
- at least one of said main forming bodies 12, 14 is movably arranged in a known manner by means of hydraulic or pneumatic actuators (not shown) towards the other for forming the sheet metal blank 10 there-between into a desired shape.
- the first main forming body 12 is a stationary die and the second main forming body 14 is a movable punch positioned directly above the die.
- the forming movement is vertical, which is generally the most common arrangement due to the weight and size of the forming apparatus 8.
- the most common material for car body panels is still steel sheet material, but it should be understood that other metals, such as aluminium may alternatively be used as the sheet metal blank 10 .
- the thickness of the sheet metal blank 10 is preferably uniform and commonly ranging between 0.5 - 1.5 mm, depending on application.
- first main forming body 12 and the second main forming body 14 are not used here in a limiting sense.
- first main forming body 12 may thus be referred to as a lower die
- second main forming body 14 may be referred to as an upper punch.
- the sheet metal blank 10 is held in place during the forming by means of a blank holder 16 which is retractable after the forming of the sheet metal blank 10 is finished. Since this is a well-established feature, it will not be discussed in further detail here.
- a separate, movable sub-forming member 16 is provided in the first main forming body 12 at a position corresponding to the local depression 4 .
- the local depression 4 constitutes a door handle depression in a car door panel 1 , such as the one shown in Fig. 1 .
- the apparatus and method is specially suited for application on so called surface critical areas, such as automobile body panels (in this case) or surfaces on other products where high demands on an even finished surface apply.
- a form recess 20 is formed in the second main forming body 14 (i.e. the punch in this case), which recess 20 is adapted for engagement with a corresponding projection 22 in a form surface 24 on the movable sub-forming member 18.
- the sub-forming member 18 is movably arranged between a protruding position, as shown in Figs 2 and 3, and a retracted position, as shown in Fig. 4 .
- the significance of these two positions will be made readily apparent below.
- the form surface 24 on the sub-forming member 18 protrudes relative to a surrounding form surface 26 of the first main forming body 12 , i.e. upwards in Fig. 2 .
- a further feature of the invention is that the sub-forming member 18 is biased towards its protruding position by means of a spring element 28 .
- the spring element will be further described below.
- a first phase the forming of said local depression 4 is completed - i.e. fully formed - before the second main forming body 14 reaches a final abutment position and before the sub-forming member 18 reaches its retracted position.
- the sheet metal blank 10 within said perimeter area 6 is stretched radially outwards around the local depression 4 due to continued travel of the sub-forming member 18 immediately before the second main forming body 14 reaches its final abutment position and before the sub-forming member 18 reaches its retracted position.
- the term immediately here corresponds to the last few millimeters - or thereabout - of the sub-forming member's 18 downward travel.
- the sheet metal forming method for use with the above-described apparatus 8 thus involves:
- the second main forming body 14 has reached its final abutment position and the sub-forming member 18 has reached its retracted position, in which the spring element 28 is now fully compressed.
- the second phase which may also be referred to as a stretching phase, is now completed.
- the sheet metal blank 10 within said perimeter area 6 is - as described above - stretched radially outwards around the local depression 4 , resulting in a more even tension around the local depression 4, in comparison with prior art forming apparatuses. This even tension prevents the undesired forming of surface defects 2 during spring back in the perimeter area 6 around the local depression 4 in the larger forming area 1 (In this case the car door panel, as illustrated in Fig. 1).
- the forming of said local depression 4 is completed when the second main forming body 14 is at a distance not exceeding 10 mm from its final abutment position.
- Succesful tests have been performed at distances ranging from 1-10 mm. More preferably, said distance does not exceed 4 mm from its final abutment position. In an advantageous embodiment in the shown door handle depression application, this distance is preferably in close proximity of 3 mm.
- the spring element 28 is a gas spring assembly, known per se.
- the spring element 28 may alternatively be a coil spring assembly or an assembly comprising an elastically compressible cushion element (not shown).
- the spring element 28 comprises a cylinder housing 30 and a piston 32, which piston is arranged in the cylinder housing 30 for movement in the axial direction of the same, i.e. vertically in the shown exemplifying Figs. 2-4 .
- the cylinder housing 30 is fixedly attached to the first main forming body 12 , whilst a distal end 34 of the piston is attached to a rear face 36 of the sub-forming member 18.
- the spring element 28 is of a controllable type, so that the sub-forming member 18 is adapted to remain in its retracted position (as seen in Fig. 4 ) during ejection of a finished sheet metal part. This is achieved by locking the piston 32 in a bottom position and controlling the return stroke of the piston 32.
- the spring element 28 is controlled by a control valve unit 44, which is connected to the cylinder housing 30 via gas & air control conduits 46 .
- the control valve unit 44 is further connected sources of pressurized air and gas (not shown) via gas & air supply conduits 48 .
- the control valve unit 44 , the gas & air control conduits 46 and the gas & air supply conduits 48 are simplified in Figs. 2-4, and are drawn schematically.
- the spring element 28 biases the sub-forming member 18 with a force (upwardly directed in Figs. 2-4 ) which is sufficient to hold the sub-forming member 18 in a fixed axial position during the first phase until the forming of the local depression 4 is completed and which is then overcome by the second main forming body 14, thus initiating continued travel in the second phase when the stretching action takes place.
- the biasing force is slightly lower, so as to allow continuous downward travel of the sub-forming member 18 also during the first phase, i.e. during the forming of the local depression 4 .
- the sub-forming member 18 is axially movable within a bore 38 in the first main forming body 12.
- the protrusion distance D of the sub-forming member 18 in its protruding position may be adjusted by means of an exchangeable annular spacer element 40 seated between the first main forming body 12 and an abutment flange 42 provided on the sub-forming member 18.
- the spacer element 40 is preferably made of steel, but may also be made of other suitable materials.
- protrusion distance, D is meant the distance between the form surface on the sub-forming member 18 and the surrounding form surface 26 of the first main forming body 12, in the axial direction of the sub-forming member 18 .
- the sub-forming member 18 correspondingly has an initial protrusion distance which will accommodate for sufficient axial travel both for the first phase and the second phase of operation.
- the first main forming body may be provided with several separate sub-forming members 18 in conjunction with respective local depressions 4 in one large forming area 1 .
Abstract
Description
- The present invention relates to a sheet metal forming apparatus and method for preventing surface defects in a perimeter area around a local depression in a larger forming area. The apparatus comprises a first main forming body and a second main forming body, at least one of said main forming bodies being movable towards the other for forming a sheet metal blank there-between into a desired shape.
- Current methods of sheet metal forming may result in minor surface defects around local depressions or abrupt form changes. These defects are particularly undesirable in so called surface critical areas, which may for example be found on automobile body panels. An example of such a surface critical area is a door handle depression in an outer car door panel. Any surface defects in this area will lead to either a rejection of the panel or extensive and costly surface refinishing work.
- The surface defects occur as a result of substantial local variations in tension around the depression as the metal is formed, which in current methods of production often leads to several permanent defects, in the form of uneven surfaces, left after the sheet metal springs back as the formed panel is released and ejected from the forming apparatus.
- The above mentioned problem is solved by the invention providing a sheet metal forming apparatus for preventing surface defects in a perimeter area around a local depression in a larger forming area. The apparatus comprises a first main forming body and a second main forming body, at least one of said main forming bodies being movable towards the other for forming a sheet metal blank there-between into a desired shape. The invention is especially characterized in:
- a separate sub-forming member provided in the first main forming body at a position corresponding to said local depression,
- said sub-forming member being movably arranged between:
- a protruding position, in which a form surface on the sub-forming member protrudes relative to a surrounding form surface of the first main forming body, and
- a retracted position, in which the form surface on the sub-forming member is level with said surrounding form surface,
- said sub-forming member being biased towards its protruding position by means of a spring element,
- In an advantageous embodiment of the invention, the forming of said local depression is adapted to be completed when the second main forming body is at a distance not exceeding 10 mm from its final abutment position.
- In a well adapted embodiment, the forming of said local depression is adapted to be completed when the second main forming body is at a distance not exceeding 4 mm from its final abutment position.
- In a suitable embodiment, the first main forming body is a stationary die and the second main forming body is a movable punch.
- Advantageously, the sub-forming member is adapted to remain in its retracted position during ejection of a finished sheet metal part.
- In a well functioning embodiment, the protrusion distance of the sub-forming member in its protruding position is adjustable by means of an exchangeable spacer element seated between the first main forming body and an abutment flange provided on the sub-forming member.
- In an advantageous embodiment, the spring element is a gas spring assembly. However, it may alternatively be of another suitable kind, such as a coil spring assembly.
- The invention also includes a sheet metal forming method for preventing surface defects in a perimeter area around a local depression in a larger forming area. The method includes the use of a forming apparatus comprising a first main forming body and a second main forming body, at least one of said main forming bodies being movable towards the other for forming a sheet metal blank there-between into a desired shape. The method is especially characterized in:
- a first phase, during which the local depression is formed between the second main forming body and a separate sub-forming member provided in the first main forming body at a position corresponding to said local depression, said sub-forming member being movably arranged between a protruding position, in which a form surface on the sub-forming member protrudes relative to a surrounding form surface of the first main forming body, and a retracted position, in which the form surface on the sub-forming member is level with said surrounding form surface, said sub-forming member being biased towards its protruding position by means of a spring element, in such a way that said local depression is completed before the second main forming body reaches a final abutment position and before the sub-forming member reaches its retracted position, and
- a second phase, during which the sheet metal blank within said perimeter area is stretched radially outwards around the local depression due to continued travel of the sub-forming member immediately before the second main forming body reaches a final abutment position and before the sub-forming member reaches its retracted position.
- Further features and advantages of the invention will be described in the detailed description of embodiments below.
- The invention will now be described in greater detail by way of example only and with reference to the attached drawings, in which
- Fig. 1 shows a schematic illustration of surface defects around a door handle depression as produced with current production methods;
- Fig. 2 shows a schematic cross-sectional view of a sheet metal forming apparatus according to an embodiment of the invention. The view shows the apparatus in an initial position, wherein a sheet metal blank to be formed has been inserted between the first and second main forming bodies;
- Fig. 3 shows a schematic cross-sectional view of the sheet metal forming apparatus as seen in Fig. 2, only in an intermediate position, in which the depression is completed before the second main forming body reaches a final abutment position and before the sub-forming member reaches its retracted position, and
- Fig. 4 finally shows a schematic cross-sectional view of the sheet metal forming apparatus as seen in Figs 2 and 3, only in a final position, in which the second main forming body has reached a final abutment position and the sub-forming member is in its retracted position.
-
- In Fig. 1, part of a
car door panel 1 is shown as an example ofsurface defects 2 around adoor handle depression 4, as produced with current, prior art production methods. Thesurface defects 2 are drawn with dashed lines in Fig. 1 and - as described initially - frequently occurs as a result of substantial local variations in tension around the depression as the metal is formed. More particularly, theundesired surface defects 2 are in the form of uneven surfaces which are left after the sheet metal springs back as the formedcar door panel 1 is released and ejected from the prior art forming apparatus (not shown). It is the general object of the present invention to preventsuch surface defects 2 from occurring in aperimeter area 6 around a local depression 4 - in this case the door handle depression - in a larger forming area 1 (i.e. in this case the car door panel). Theperimeter area 6 is loosely shown in Fig. 1 with bold face dash-dotted lines. - Fig. 2 shows a schematic cross-sectional view of a sheet
metal forming apparatus 8 according to an exemplifying embodiment of the present invention. The view in Fig. 2 shows theapparatus 8 in an initial position, wherein a sheet metal blank 10 to be formed has been inserted between a first main formingbody 12 and a second main formingbody 14. In the widest meaning, at least one of said main formingbodies body 12 is a stationary die and the second main formingbody 14 is a movable punch positioned directly above the die. Thus, in this case, the forming movement is vertical, which is generally the most common arrangement due to the weight and size of the formingapparatus 8. In the automotive industry, the most common material for car body panels is still steel sheet material, but it should be understood that other metals, such as aluminium may alternatively be used as the sheet metal blank 10. The thickness of the sheet metal blank 10 is preferably uniform and commonly ranging between 0.5 - 1.5 mm, depending on application. - The skilled man in the art will recognise that the shown orientation and labelling of constituent parts, such as for example the first main forming
body 12 and the second main formingbody 14, are not used here in a limiting sense. Alternatively - where appropriate - the first main formingbody 12 may thus be referred to as a lower die, whilst the second main formingbody 14 may be referred to as an upper punch. - In a known manner, the sheet metal blank 10 is held in place during the forming by means of a
blank holder 16 which is retractable after the forming of the sheet metal blank 10 is finished. Since this is a well-established feature, it will not be discussed in further detail here. - According to the invention, a separate,
movable sub-forming member 16 is provided in the first main formingbody 12 at a position corresponding to thelocal depression 4. In Figs. 2-4, thelocal depression 4 constitutes a door handle depression in acar door panel 1, such as the one shown in Fig. 1. It should be noted that the apparatus and method is specially suited for application on so called surface critical areas, such as automobile body panels (in this case) or surfaces on other products where high demands on an even finished surface apply. - For forming the
local depression 4, aform recess 20 is formed in the second main forming body 14 (i.e. the punch in this case), which recess 20 is adapted for engagement with acorresponding projection 22 in aform surface 24 on themovable sub-forming member 18. - The
sub-forming member 18 is movably arranged between a protruding position, as shown in Figs 2 and 3, and a retracted position, as shown in Fig. 4. The significance of these two positions will be made readily apparent below. - In the protruding position, the
form surface 24 on thesub-forming member 18 protrudes relative to a surroundingform surface 26 of the first main formingbody 12, i.e. upwards in Fig. 2. - In the retracted position, the
form surface 24 on thesub-forming member 18 is level with the surroundingform surface 26. - A further feature of the invention is that the
sub-forming member 18 is biased towards its protruding position by means of aspring element 28. The spring element will be further described below. - In a first phase according to the invention, the forming of said
local depression 4 is completed - i.e. fully formed - before the second main formingbody 14 reaches a final abutment position and before thesub-forming member 18 reaches its retracted position. Then, in a second phase, thesheet metal blank 10 within saidperimeter area 6 is stretched radially outwards around thelocal depression 4 due to continued travel of thesub-forming member 18 immediately before the second main formingbody 14 reaches its final abutment position and before thesub-forming member 18 reaches its retracted position. The term immediately here corresponds to the last few millimeters - or thereabout - of the sub-forming member's 18 downward travel. - The sheet metal forming method for use with the above-described
apparatus 8, thus involves: - a first phase, during which the
local depression 4 is formed between the second main formingbody 14 and the separatesub-forming member 18, and - a second phase, during which the
sheet metal blank 10 within saidperimeter area 6 is stretched radially outwards around thelocal depression 4 due to continued travel of thesub-forming member 18 immediately before the second main formingbody 14 reaches a final abutment position and before thesub-forming member 18 reaches its retracted position. - In Fig. 3, the forming of the
local depression 4 has just been completed - thus marking the end of the first phase - whereby thesub-forming member 18 begins to move downwards whilst thespring element 28 is compressed - urged by the second main formingbody 14. - In Fig. 4, the second main forming
body 14 has reached its final abutment position and thesub-forming member 18 has reached its retracted position, in which thespring element 28 is now fully compressed. Thus, the second phase, which may also be referred to as a stretching phase, is now completed. Thesheet metal blank 10 within saidperimeter area 6 is - as described above - stretched radially outwards around thelocal depression 4, resulting in a more even tension around thelocal depression 4, in comparison with prior art forming apparatuses. This even tension prevents the undesired forming ofsurface defects 2 during spring back in theperimeter area 6 around thelocal depression 4 in the larger forming area 1 (In this case the car door panel, as illustrated in Fig. 1). - Suitably, the forming of said
local depression 4 is completed when the second main formingbody 14 is at a distance not exceeding 10 mm from its final abutment position. Succesful tests have been performed at distances ranging from 1-10 mm. More preferably, said distance does not exceed 4 mm from its final abutment position. In an advantageous embodiment in the shown door handle depression application, this distance is preferably in close proximity of 3 mm. - In the shown embodiment, the
spring element 28 is a gas spring assembly, known per se. However, it should be noted that thespring element 28 may alternatively be a coil spring assembly or an assembly comprising an elastically compressible cushion element (not shown). Thespring element 28 comprises acylinder housing 30 and apiston 32, which piston is arranged in thecylinder housing 30 for movement in the axial direction of the same, i.e. vertically in the shown exemplifying Figs. 2-4. Thecylinder housing 30 is fixedly attached to the first main formingbody 12, whilst adistal end 34 of the piston is attached to arear face 36 of thesub-forming member 18. Preferably, thespring element 28 is of a controllable type, so that thesub-forming member 18 is adapted to remain in its retracted position (as seen in Fig. 4) during ejection of a finished sheet metal part. This is achieved by locking thepiston 32 in a bottom position and controlling the return stroke of thepiston 32. Thespring element 28 is controlled by acontrol valve unit 44, which is connected to thecylinder housing 30 via gas &air control conduits 46. Thecontrol valve unit 44 is further connected sources of pressurized air and gas (not shown) via gas &air supply conduits 48. For the sake of clarity, thecontrol valve unit 44, the gas &air control conduits 46 and the gas &air supply conduits 48 are simplified in Figs. 2-4, and are drawn schematically. - In one embodiment of the invention, the
spring element 28 biases thesub-forming member 18 with a force (upwardly directed in Figs. 2-4) which is sufficient to hold thesub-forming member 18 in a fixed axial position during the first phase until the forming of thelocal depression 4 is completed and which is then overcome by the second main formingbody 14, thus initiating continued travel in the second phase when the stretching action takes place. In an alternative embodiment, the biasing force is slightly lower, so as to allow continuous downward travel of thesub-forming member 18 also during the first phase, i.e. during the forming of thelocal depression 4. - With reference again to Fig. 2, the
sub-forming member 18 is axially movable within abore 38 in the first main formingbody 12. In the shown embodiment, the protrusion distance D of thesub-forming member 18 in its protruding position may be adjusted by means of an exchangeableannular spacer element 40 seated between the first main formingbody 12 and anabutment flange 42 provided on thesub-forming member 18. Thespacer element 40 is preferably made of steel, but may also be made of other suitable materials. By the term protrusion distance, D, is meant the distance between the form surface on thesub-forming member 18 and thesurrounding form surface 26 of the first main formingbody 12, in the axial direction of thesub-forming member 18. If the bias-force is adjusted so as to allow continuous downward travel of thesub-forming member 18 also during the first phase, i.e. during the forming of thelocal depression 4, thesub-forming member 18 correspondingly has an initial protrusion distance which will accommodate for sufficient axial travel both for the first phase and the second phase of operation.. - Finally, it is to be understood that the invention is by no means limited to the embodiments described above, and may be varied freely within the scope of the appended claims. For example, the first main forming body may be provided with several separate
sub-forming members 18 in conjunction with respectivelocal depressions 4 in one large formingarea 1. -
- 1.
- Car door panel (or Larger forming area)
- 2.
- Surface defects (resulting from Prior Art methods)
- 4.
- Local depression (e.g. door handle depression)
- 6.
- Perimeter area around local depression
- 8.
- Sheet metal forming apparatus
- 10.
- Sheet metal blank
- 12.
- First main forming body
- 14.
- Second main forming body
- 16.
- Blank holder
- 18.
- Sub-forming member
- 20.
- Recess in second main forming member
- 22.
- Projection on sub-forming member
- 24.
- Form surface on sub-forming member
- 26.
- Surrounding form surface on first forming member
- 28.
- Spring element
- 30.
- Piston
- 32.
- Cylinder housing
- 34.
- Distal end of piston
- 36.
- Rear face of sub-forming member
- 38.
- Bore for sub-forming member
- 40.
- Spacer element
- 42.
- Abutment flange
- 44.
- Control valve unit
- 46.
- Gas & air control conduits
- 48.
- Gas & air supply conduits
- D:
- Protrusion distance for sub-forming member
whereby, in a second phase, the sheet metal blank within said perimeter area is stretched radially outwards around the local depression due to continued travel of the sub-forming member immediately before the second main forming body reaches its final abutment position and before the sub-forming member reaches its retracted position.
Claims (10)
- Sheet metal forming apparatus (8) for preventing surface defects (2) in a perimeter area (6) around a local depression (4) in a larger forming area (1), said apparatus (8) comprising a first main forming body (12) and a second main forming body (14), at least one of said main forming bodies (12, 14) being movable towards the other for forming a sheet metal blank (10) there-between into a desired shape,
characterized in:a separate sub-forming member (18) provided in the first main forming body (12) at a position corresponding to said local depression (4),said sub-forming member (18) being movably arranged between:a protruding position, in which a form surface (24) on the sub-forming member (18) protrudes relative to a surrounding form surface (26) of the first main forming body (12), anda retracted position, in which the form surface (24) on the sub-forming member (18) is level with said surrounding form surface (26),said sub-forming member (18) being biased towards its protruding position by means of a spring element (28),
whereby, in a second phase, the sheet metal blank (10) within said perimeter area (6) is stretched radially outwards around the local depression (4) due to continued travel of the sub-forming member (18) immediately before the second main forming body (14) reaches its final abutment position and before the sub-forming member (18) reaches its retracted position. - Apparatus (8) according to claim 1, characterized in that the forming of said local depression (4) is adapted to be completed when the second main forming body (14) is at a distance not exceeding 10 mm from its final abutment position.
- Apparatus (8) according to claim 2, characterized in that the forming of said local depression (4) is adapted to be completed when the second main forming body (14) is at a distance not exceeding 4 mm from its final abutment position.
- Apparatus (8) according to claim 1, 2 or 3, characterized in that said first main forming body (12) is a stationary die and that said second main forming body (14) is a movable punch.
- Apparatus (8) according to any of the preceding claims, characterized in that the sub-forming member (18) is adapted to remain in its retracted position during ejection of a finished sheet metal part.
- Apparatus (8) according to any of the preceding claims, characterized in that the protrusion distance (D) of the sub-forming member (18) in its protruding position is adjustable by means of an exchangeable spacer element (40) seated between the first main forming body (12) and an abutment flange (42) provided on the sub-forming member (18).
- Apparatus (8) according to any of the preceding claims, characterized in that the spring element (28) is a gas spring assembly.
- Apparatus (8) according to any of claims 1 to 7, characterized in that the spring element (28) is a coil spring assembly.
- Sheet metal forming method for preventing surface defects (2) in a perimeter area (6) around a local depression (4) in a larger forming area (1), said method including the use of a forming apparatus (8) comprising a first main forming body (12) and a second main forming body (14), at least one of said main forming bodies (12, 14) being movable towards the other for forming a sheet metal blank (10) there-between into a desired shape,
characterized in:a first phase, during which the local depression (4) is formed between the second main forming body (14) and a separate sub-forming member (18) provided in the first main forming body (12) at a position corresponding to said local depression (4), said sub-forming member (18) being movably arranged between a protruding position, in which a form surface (20) on the sub-forming member (18) protrudes relative to a surrounding form surface (24) of the first main forming body (12), and a retracted position, in which the form surface (24) on the sub-forming member (18) is level with said surrounding form surface (26), said sub-forming member (18) being biased towards its protruding position by means of a spring element (28), in such a way that said local depression (4) is completed before the second main forming body (14) reaches a final abutment position and before the sub-forming member (18) reaches its retracted position, anda second phase, during which the sheet metal blank (10) within said perimeter area (6) is stretched radially outwards around the local depression (4) due to continued travel of the sub-forming member (18) immediately before the second main forming body (14) reaches a final abutment position and before the sub-forming member (18) reaches its retracted position. - Method according to claim 9, characterized in that the sub-forming member (18) remains in its retracted position during ejection of a finished sheet metal part.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE602004001441T DE602004001441T2 (en) | 2004-01-09 | 2004-01-09 | Apparatus and method for forming metal sheets on critical surfaces of trim parts |
EP20040000331 EP1552893B1 (en) | 2004-01-09 | 2004-01-09 | Device and method for sheet metal forming in surface critical panels |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20040000331 EP1552893B1 (en) | 2004-01-09 | 2004-01-09 | Device and method for sheet metal forming in surface critical panels |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1552893A1 true EP1552893A1 (en) | 2005-07-13 |
EP1552893B1 EP1552893B1 (en) | 2006-07-05 |
Family
ID=34585962
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20040000331 Expired - Fee Related EP1552893B1 (en) | 2004-01-09 | 2004-01-09 | Device and method for sheet metal forming in surface critical panels |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1552893B1 (en) |
DE (1) | DE602004001441T2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1844871A2 (en) * | 2006-04-14 | 2007-10-17 | Honda Motor Co., Ltd | Press working method and press working apparatus |
CN101054003B (en) * | 2006-04-14 | 2010-05-26 | 本田技研工业株式会社 | Press working method and press working apparatus |
JP2018158351A (en) * | 2017-03-22 | 2018-10-11 | 新日鐵住金株式会社 | Apparatus and method for manufacturing panel having character line |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007012657A1 (en) | 2007-03-16 | 2008-09-18 | Wilhelm Karmann Gmbh | Tool for shaping plate, has one tool part with stamp and recess provided in another tool part, where plate is arranged between recess and stamp, and holder is adjusted relative to stamp |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3197996A (en) * | 1962-12-07 | 1965-08-03 | Budd Co | Redrawing dies for deep drawing to varying depths |
US4358263A (en) * | 1980-07-26 | 1982-11-09 | Honda Giken Kogyo Kabushiki Kaisha | Press apparatus |
JPS58157531A (en) * | 1982-03-16 | 1983-09-19 | Nissan Motor Co Ltd | Press die |
EP0730919A2 (en) * | 1995-03-09 | 1996-09-11 | Toyota Jidosha Kabushiki Kaisha | Method of and apparatus for deep drawing |
EP1043090A1 (en) * | 1999-04-07 | 2000-10-11 | RAINER S.r.l. | Die for drawing sheet metal and similar |
-
2004
- 2004-01-09 EP EP20040000331 patent/EP1552893B1/en not_active Expired - Fee Related
- 2004-01-09 DE DE602004001441T patent/DE602004001441T2/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3197996A (en) * | 1962-12-07 | 1965-08-03 | Budd Co | Redrawing dies for deep drawing to varying depths |
US4358263A (en) * | 1980-07-26 | 1982-11-09 | Honda Giken Kogyo Kabushiki Kaisha | Press apparatus |
JPS58157531A (en) * | 1982-03-16 | 1983-09-19 | Nissan Motor Co Ltd | Press die |
EP0730919A2 (en) * | 1995-03-09 | 1996-09-11 | Toyota Jidosha Kabushiki Kaisha | Method of and apparatus for deep drawing |
EP1043090A1 (en) * | 1999-04-07 | 2000-10-11 | RAINER S.r.l. | Die for drawing sheet metal and similar |
Non-Patent Citations (1)
Title |
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PATENT ABSTRACTS OF JAPAN vol. 0072, no. 83 (M - 263) 16 December 1983 (1983-12-16) * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1844871A2 (en) * | 2006-04-14 | 2007-10-17 | Honda Motor Co., Ltd | Press working method and press working apparatus |
EP1844871A3 (en) * | 2006-04-14 | 2007-12-26 | Honda Motor Co., Ltd | Press working method with a punch step and press working apparatus with a movable punch |
CN101054003B (en) * | 2006-04-14 | 2010-05-26 | 本田技研工业株式会社 | Press working method and press working apparatus |
US7765848B2 (en) | 2006-04-14 | 2010-08-03 | Honda Motor Co., Ltd. | Press working method and press working apparatus |
US7963141B2 (en) | 2006-04-14 | 2011-06-21 | Honda Motor Co., Ltd. | Press working method and press working apparatus |
JP2018158351A (en) * | 2017-03-22 | 2018-10-11 | 新日鐵住金株式会社 | Apparatus and method for manufacturing panel having character line |
Also Published As
Publication number | Publication date |
---|---|
DE602004001441D1 (en) | 2006-08-17 |
EP1552893B1 (en) | 2006-07-05 |
DE602004001441T2 (en) | 2007-06-28 |
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