US3225581A - Metal forming process for shaping ends of tubes - Google Patents
Metal forming process for shaping ends of tubes Download PDFInfo
- Publication number
- US3225581A US3225581A US132868A US13286861A US3225581A US 3225581 A US3225581 A US 3225581A US 132868 A US132868 A US 132868A US 13286861 A US13286861 A US 13286861A US 3225581 A US3225581 A US 3225581A
- Authority
- US
- United States
- Prior art keywords
- tube
- punch
- enlarged
- edge
- clamping device
- 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 - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
- F16L19/04—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts using additional rigid rings, sealing directly on at least one pipe end, which is flared either before or during the making of the connection
-
- 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
- B21D41/00—Application of procedures in order to alter the diameter of tube ends
- B21D41/02—Enlarging
- B21D41/025—Enlarging by means of impact-type swaging hand tools
Definitions
- Such metal forming may be applied, as in one example, to copper tubing or brass tubing or the like, to provide a curved flange at one end; the flange is used for attaching the tube to a fitting, such as the inlet side of a faucet.
- the tube may be coupled to the inlet, as for a wash basin faucet, to connect the faucet to a shut-off valve located below the basin.
- a series of forming tools or punches is used, operating in succession to provide an enlargement at the end of the tube, and then reversely to bend the edge of the enlargement to form three layers of metal around the end of the tube.
- FIGURE 1 is a diagrammatic elevation of a press incorporating the invention
- FIG. 2 is a pictorial view, showing the stages of folding the end of the tube
- FIG. 3 is an enlarged sectional view, showing the manner in which the tube may be attached to a fitting
- FIG. 4 is a View, mainly in section, illustrating the means for accomplishing the first step in the process of forming the tube, the blank and the punch structure being shown ready for the punching operation;
- FIG. 5 is a view similar to FIG. 4, but illustrating the completion of the first step, and enlarged;
- FIG. 6 is a view similar to FIG. 5, but illustrating the completion of the second step in which there is a further enlargement formed at the end of the tube;
- FIG. 7 is a view similar to FIG. 4, illustrating the completion of the third or last step.
- FIGS. 7a and 7b are views similar to FIG. 7, illustrating intermediate positions of the punches.
- a tube blank 1 (FIGS. 1, 2(a), and 4) is adapted to be releasably clamped by the clamping structures 2.
- This blank is normally made of quite malleable metal such as copper, to ensure that the bending operations will not injure the tube walls.
- the blank 1 is a straight tube of uniform diameter, adapted to be supplied to the clamps 2 in any conventional manner.
- the blank is operated upon in succession by three punch structures 5, 6, and 7. These punch structures are supported in the present instance in vertical arrangement, upon a common support 8. This support is vertically moveable so as to align the punch structures 5, 6, and 7, in succession with the axis of blank 1.
- Each of the punch structures at its right-hand end is provided with a disc-like abutment 9, 10, or 11; and is, furthermore, longitudinally moveable in the support 8.
- the blank 1 In the position shown in FIG. 1, the blank 1 is in alignment with the first punch structure 5.
- This structure 5 may be urged toward the left by a piston 12.
- This piston 12 can be hydraulically operated by the aid of the cylinder structure 13.
- stage b illustrated by reference character 35 in FIG. 2.
- This stage now includes an enlarged end 15, joined to the main body of tube 35 by the tapered shoulder 34.
- the second stage 0 is illustrated by reference character 36 in FIG. 2.
- a further enlargement 46 is formed at the end of the tube.
- the last stage d corresponding to the completion of the operation by punch structure 7 is illustrated by tube 14 in FIG. 2.
- the end is reversely bent to define a spherical zone surface on the exterior.
- the punch structures 5, 6, and 7 produce the finished product, shown enlarged in FIG. 3.
- the completed tube 14 is shown with its enlarged portion 15.
- Folded around this enlarged portion are two layers of material formed integrally with the tube 14 and around the outer periphery forming with the tube three layers in all. These layers 16, 17, and 18 are quite closely folded the outer two forming a reinforced collar around the exterior of the enlarged part 15.
- external layer 18 is curved, preferably as a spherical zone, which fits a spherical seat 19 of fitting 20.
- This fitting 20 may correspond to the inlet for a valve or the like.
- the spherical surface formed on the external layer 18 is urged into place by the aid of a conventional nut 21 having an inwardly directed flange 22. This flange engages the loop form between the layers 17 and 18, and urges the tube 14 tightly against the seat 19.
- the first punch structure 5 is adapted to form the enlargement 15 (FIGS. 2, 3, and 5) by expanding the end of the blank 1.
- the punch structure 5 as shown in FIGS. 4 and 5, includes the punch holder 23 of generally cylindrical form and integrally formed with the disc 9.
- the punch structure carries the punch proper 24, as by the aid of a threaded extremity 24b formed on the shank 24a of the punch 24.
- the punch 24 furthermore has an operating cylindrical portion 25 which is adapted to enter into the blank 1 so as to expand the end of the blank 1.
- This operating portion 25 is of slightly larger diameter than the shank 24a, and it is surrounded at a slight distance therefrom by the cylindrical walls 27 of a circular recess in the external end of the sleeve member 26.
- This recess communicates with an adjacent concentric recess of smaller diameter in the opposite end of the sleeve member, this smaller diameter being substantially the same as that of the aperture 28 which fits the shank 24a.
- This construction permits the sleeve member 26 to be attached to the shank between the punch holder 23 and the end of the tube. The punch proper 25 thus can seat against the shoulder 29 formed between the aperture 28 and the cylindrical surface 27.
- a conical or tapered portion 31 Extending from the punch proper 25 is a conical or tapered portion 31. When this tapered portion enters the end of blank 1, the expansion begins. A somewhat narrower tapered portion 32 extends to the left of the portion 31 and terminates in a cylindrical piloting end 33. Furthermore, a set screw 64 serves to hold the punch 24 securely in place in the holder 23.
- the punch structure 5 When the punch structure 5 is in alignment with the blank 1, as illustrated in FIG. 1, the punch structure 5 can be urged toward the left by the aid of the piston 12. When this force is exerted, the piloting end 33 snugly enters the end of the blank 1 and continued pressure applied to the punch structure finally results in the forming of the end of the tube, as illustrated in FIG. 5, to provide the enlarged portion 15, and a tapered portion 34.
- the support 8 is moved upwardly so as to align the punch structure 6 with the axis of the tube 35 (FIG. 6).
- the punch holder 37 serves in the same manner to support a punch 38 having a cylindrical shank 39. This cylindrical shank terminates in an extension 40 threaded into the holder 37 and held securely against removal by set screw 41.
- a flange 42 integral with the punch 38 serves to hold the sleeve 43 in place against the left-hand end of the holder 37, the sleeve 43 and the cylindrical portion 44 of the punch 38 defining annular space 45 corresponding to the still further enlarged extremity 46 of the tube 36.
- a tapered shoulder 47 extends from the left-hand end of the cylindrical portion 44 and joins reversely tapered portion 48.
- the tapered portion 48 has a taper of one or two degrees, and serves to permit ready removal of the punch after it has completed its operation.
- This punch structure 7 shown in FIG. 7, includes the holder 23 and is held as by the set screw 34 in a firmly fixed position.
- the punch proper 52 includes a shank 53 and an enlarged cylindrical portion 54. This cylindrical portion 54 serves to hold the sleeve 55 tightly against the left-hand end of the holder 23. This is accomplished in the same manner as before.
- the sleeve 55 defines at its left-hand end a concave spherical surface 56 (see also FIGS. 7a and 7b).
- This surface is that of a spherical zone having a center 57 on the axis of the finished tube 14.
- the larger end of the zone corresponds to the left-hand end of the sleeve. It has a diameter corresponding to the outer diameter of the enlarged end 46.
- the punch 52 has a narrow tapered shoulder 58.
- the taper of this shoulder is such that the. cone elements defining this taper are centered on the center 57.
- the punch 52 has in succession a cylindrical portion 59 which is about the same diameter as the internal diameter of the enlarged portion 15.
- the punch structure also includes the tapered shoulder 60 and a piloting end 61.
- the enlarged end 46 of tube 36 is bent inwardly to define a spherical member 63, which ultimately forms the outermost layer 18 of FIG. 3. This inward bend is effected by continued contact of the concave zone 56 with the outer periphery of the portion 46.
- FIG. 7a The conclusion of this part of the folding is illustrated in FIG. 7a.
- the continued application of the compressive force toward the left exerted by the punch structure 7 causes a fold to develop shown in incipient form by reference character 62 in FIG. 7a.
- the bending ring 62 is formed at the inner end of the outer enlarged portion 46.
- the bending ring is formed by the frustoconical part 47 (FIG. 6).
- the fold thus begun as indicated in FIG. 7a is compressed as shown in FIG. 7b and ends with a complete fold as shown in FIG. 7.
- the small end of the zone has a stop defined by the tapered shoulder 58. This tapered shoulder thus prevents further inward movement of the metal and ensures folding to the ultimate form shown in FIGS. 3 and 7.
- the process of making a plumbing fitting from a malleable tube of substantially uniform cross-section which comprises: securing the tube by a clamping device so that a length of the tube is exposed beyond the device; driving a forming tool into the end of the tube to define an enlarged end that merges with the main body of the tube at a substantially conical part to form a bending ring; forcing the edge of the enlarged end progressively into a converging recess to provide an external surface contour; and applying a longitudinal compressive force between points of the tube spaced on opposite sides of said bending ring to fold material from the enlarged end rearwardly beyond the bending ring at a place spaced from said clamping device.
Description
Claims (1)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US132868A US3225581A (en) | 1961-08-21 | 1961-08-21 | Metal forming process for shaping ends of tubes |
US447936A US3263476A (en) | 1961-08-21 | 1965-03-15 | Metal forming process for shaping ends of tubes and the product thereof |
US447935A US3266822A (en) | 1961-08-21 | 1965-03-15 | Metal forming process for shaping ends of tubes and the product thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US132868A US3225581A (en) | 1961-08-21 | 1961-08-21 | Metal forming process for shaping ends of tubes |
Publications (1)
Publication Number | Publication Date |
---|---|
US3225581A true US3225581A (en) | 1965-12-28 |
Family
ID=22455948
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US132868A Expired - Lifetime US3225581A (en) | 1961-08-21 | 1961-08-21 | Metal forming process for shaping ends of tubes |
Country Status (1)
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US (1) | US3225581A (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3468153A (en) * | 1967-11-20 | 1969-09-23 | Nat Can Corp | Die set unit and method for can manufacture |
US4102173A (en) * | 1977-03-30 | 1978-07-25 | Wheatland Tube Company | End forming apparatus for elongated work pieces |
US4148269A (en) * | 1976-02-26 | 1979-04-10 | Standard Container Company | Method of making dripless metal can nozzle |
US4262518A (en) * | 1979-07-16 | 1981-04-21 | Caterpillar Tractor Co. | Tube expander and method |
FR2599647A1 (en) * | 1986-06-05 | 1987-12-11 | Mitsuboshi Seisakusho | Process for manufacturing a gear-change lever and lever obtained |
US4732030A (en) * | 1986-06-17 | 1988-03-22 | Takeru Tanaka | Method of manufacturing gear-shift lever and the lever constitution |
US5582054A (en) * | 1993-11-26 | 1996-12-10 | Nippondenso Co., Ltd. | Method of producing bulge-shaped pipe |
US6068380A (en) * | 1998-07-28 | 2000-05-30 | Gentex Corporation | Mirror mount having an integral spherical bearing |
US6932358B1 (en) * | 2002-10-31 | 2005-08-23 | Lomar Machine & Tool Co. | Quick change endform tool cartridge |
US20150285296A1 (en) * | 2014-04-08 | 2015-10-08 | U.S. Manufacturing Corporation | Variable-Wall Light-Weight Axle Shaft with an Integral Flange Member and Method for Making the Same |
US9630451B2 (en) | 2014-06-18 | 2017-04-25 | American Axle & Manufacturing, Inc. | Method of manufacturing hollow axle shaft for a vehicle |
CN113579135A (en) * | 2021-06-29 | 2021-11-02 | 中联重科股份有限公司 | Pipe fitting machining method |
CN113579134A (en) * | 2021-06-29 | 2021-11-02 | 中联重科股份有限公司 | Pipe fitting processing equipment |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1152858A (en) * | 1914-12-16 | 1915-09-07 | Nat Supply Co | Method of making tubing-rings. |
GB312024A (en) * | 1928-11-15 | 1929-05-23 | Ver Stahlwerke Ag | Improved method of and apparatus for producing reinforced ends of pipes of at least triple wall thickness |
US1804814A (en) * | 1928-02-03 | 1931-05-12 | Simplex Copper Joint Company | Pipe coupling and method of forming the same |
US1817854A (en) * | 1929-06-11 | 1931-08-04 | Sorensen John | Process of producing coupling flanges |
US2460110A (en) * | 1947-10-30 | 1949-01-25 | H B Sherman Mfg Company | Coupling means |
US2552768A (en) * | 1949-08-17 | 1951-05-15 | Joseph J Brophy | Thread joint for tubular members |
GB709061A (en) * | 1949-10-31 | 1954-05-12 | Teves Gmbh Alfred | Improvements in or relating to pipe couplings |
US2746325A (en) * | 1952-12-12 | 1956-05-22 | George E Kjellberg | Tube end forming hand tool |
US2780122A (en) * | 1955-09-20 | 1957-02-05 | Joe F Mccown | Tool for removing dents from thin wall pipe |
US2857666A (en) * | 1950-12-11 | 1958-10-28 | Walter O Beyer | Making coupling assemblies |
-
1961
- 1961-08-21 US US132868A patent/US3225581A/en not_active Expired - Lifetime
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1152858A (en) * | 1914-12-16 | 1915-09-07 | Nat Supply Co | Method of making tubing-rings. |
US1804814A (en) * | 1928-02-03 | 1931-05-12 | Simplex Copper Joint Company | Pipe coupling and method of forming the same |
GB312024A (en) * | 1928-11-15 | 1929-05-23 | Ver Stahlwerke Ag | Improved method of and apparatus for producing reinforced ends of pipes of at least triple wall thickness |
US1817854A (en) * | 1929-06-11 | 1931-08-04 | Sorensen John | Process of producing coupling flanges |
US2460110A (en) * | 1947-10-30 | 1949-01-25 | H B Sherman Mfg Company | Coupling means |
US2552768A (en) * | 1949-08-17 | 1951-05-15 | Joseph J Brophy | Thread joint for tubular members |
GB709061A (en) * | 1949-10-31 | 1954-05-12 | Teves Gmbh Alfred | Improvements in or relating to pipe couplings |
US2857666A (en) * | 1950-12-11 | 1958-10-28 | Walter O Beyer | Making coupling assemblies |
US2746325A (en) * | 1952-12-12 | 1956-05-22 | George E Kjellberg | Tube end forming hand tool |
US2780122A (en) * | 1955-09-20 | 1957-02-05 | Joe F Mccown | Tool for removing dents from thin wall pipe |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3468153A (en) * | 1967-11-20 | 1969-09-23 | Nat Can Corp | Die set unit and method for can manufacture |
US4148269A (en) * | 1976-02-26 | 1979-04-10 | Standard Container Company | Method of making dripless metal can nozzle |
US4102173A (en) * | 1977-03-30 | 1978-07-25 | Wheatland Tube Company | End forming apparatus for elongated work pieces |
US4262518A (en) * | 1979-07-16 | 1981-04-21 | Caterpillar Tractor Co. | Tube expander and method |
FR2599647A1 (en) * | 1986-06-05 | 1987-12-11 | Mitsuboshi Seisakusho | Process for manufacturing a gear-change lever and lever obtained |
US4732030A (en) * | 1986-06-17 | 1988-03-22 | Takeru Tanaka | Method of manufacturing gear-shift lever and the lever constitution |
US5582054A (en) * | 1993-11-26 | 1996-12-10 | Nippondenso Co., Ltd. | Method of producing bulge-shaped pipe |
US6068380A (en) * | 1998-07-28 | 2000-05-30 | Gentex Corporation | Mirror mount having an integral spherical bearing |
US6932358B1 (en) * | 2002-10-31 | 2005-08-23 | Lomar Machine & Tool Co. | Quick change endform tool cartridge |
US20150285296A1 (en) * | 2014-04-08 | 2015-10-08 | U.S. Manufacturing Corporation | Variable-Wall Light-Weight Axle Shaft with an Integral Flange Member and Method for Making the Same |
US9670951B2 (en) * | 2014-04-08 | 2017-06-06 | A.A.M International S.A.R.L. | Variable-wall light-weight axle shaft with an integral flange member and method for making the same |
US10543717B2 (en) | 2014-04-08 | 2020-01-28 | Aam International S.À R.L. | Variable-wall light-weight axle shaft with an integral flange member and method for making the same |
US9630451B2 (en) | 2014-06-18 | 2017-04-25 | American Axle & Manufacturing, Inc. | Method of manufacturing hollow axle shaft for a vehicle |
CN113579135A (en) * | 2021-06-29 | 2021-11-02 | 中联重科股份有限公司 | Pipe fitting machining method |
CN113579134A (en) * | 2021-06-29 | 2021-11-02 | 中联重科股份有限公司 | Pipe fitting processing equipment |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: PRICE-PFISTER BRASS MFG. CO. 13500 PAXTON ST., PAC Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:NI WEST, INC.;REEL/FRAME:004196/0677 Effective date: 19830624 Owner name: PRICE PFISTER, INC. Free format text: CHANGE OF NAME;ASSIGNOR:PRICE PFISTER, NI INDUSTRIES, INC.;REEL/FRAME:004196/0672 Effective date: 19830627 |
|
AS | Assignment |
Owner name: WELLS FARGO BANK, N.A., REGIONAL COMMERCIAL BANKIN Free format text: SECURITY INTEREST;ASSIGNOR:PRICE PFISTER, INC., A CORP. OF DE;REEL/FRAME:004259/0685 Effective date: 19840328 |
|
AS | Assignment |
Owner name: PRUDENTIAL INSURANCE COMPANY OF AMERICAN THE, C/O Free format text: SECURITY INTEREST;ASSIGNOR:PRICE PFISTER, INC., A CORP. OF DE.;REEL/FRAME:004605/0690 Effective date: 19860711 |
|
AS | Assignment |
Owner name: PRICE PFISTER, INC., 13500 PAXTON STREET, PACOIMA, Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PRUDENTIAL INSURANCE COMPANY OF AMERICAN, THE,;REEL/FRAME:004747/0743 Effective date: 19870710 Owner name: PRICE PFISTER, INC., CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PRUDENTIAL INSURANCE COMPANY OF AMERICAN, THE,;REEL/FRAME:004747/0743 Effective date: 19870710 |