US3050849A - Method of cold forming metal - Google Patents

Method of cold forming metal Download PDF

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Publication number
US3050849A
US3050849A US816976A US81697659A US3050849A US 3050849 A US3050849 A US 3050849A US 816976 A US816976 A US 816976A US 81697659 A US81697659 A US 81697659A US 3050849 A US3050849 A US 3050849A
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Prior art keywords
punch
disk
forming
blanking
metal
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Expired - Lifetime
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US816976A
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Jr John O Etchison
Erle M Hutchins
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AT&T Corp
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Western Electric Co Inc
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Priority to US816976A priority Critical patent/US3050849A/en
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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
    • B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00

Definitions

  • 'It is an object of this invention to provide a method of cold forming metal into cups in a continuous operation.
  • a further object of this invention is to provide a method of cold forming metal into cups during a single forward stroke of a blanking and forming die.
  • a method of forming cups embodying certain features of this invention may include the steps of inserting a metal disk into a die, depressing the central portion of the disk while simultaneously thickening the marginal portions of the disk, advancing the central depressed portion of the disk to form a cup while simultaneously forcing the metal in the thickened marginal portion of the disk into the side wall of the cup being formed.
  • FIG. 1 is a cross-sectional view of a press supporting a metal plate in a blanking position
  • PIG. 2 is a cross-sectional view of the press showing a metal disk being blanked out of the metal plate and inserted into a forming die by a blanking punch;
  • FIG. 3 is a cross-sectional View of the press showing the disk as it is bottomed on the forming die by a forming punch mounted within the blanking punch;
  • ⁇ FIG. 4 is a cross-sectional view of the press showing the central portion of the disk being depressed and the marginal portion being thickened by the forming punch;
  • FIG. 5 is a cross-sectional View of the press showing the central portion of the disk as it is advanced by the forming punch;
  • FIG. 6 is a cross-sectional View of the press showing the forming punch in a withdrawn position and the metal cup as it is stripped therefrom.
  • a ⁇ strip of sheet metal 11, or other like material from which it is desired to form a cup-like receptacle is shown supported on a rigidly xed forming die 12 and over a cylindrical die cavity 13 formed in the die 12.
  • a vertically supported cylindrical blanking punch 14 of a diameter slightly less than that of the die cavity 13 is reciprocated by any suitable means, not shown, to blank out a cylindrical disk of any desired diameter'7 as determined by the diameter of the blanking punch, and force it into the die cavity 13. The diameter of the disk determines the volume of the cornpleted cup.
  • the blanking punch 14 is stopped before the disk 15 bottoms in the die cavity 13.
  • a forming punch 16 mounted axially with the blanking punch 14 and reciprocated in a continuous stroke at a constant speed correspending to that of the blanking punch by suitable means, not shown, continues its descent after punch 14 is stopped and bottoms the disk 15 within the die cavity 13 and against a spring-biased backing punch 17 which extends to the bottom of die cavity 13 through an opening 1S in the forming die 12.
  • the center portion of the disk is depressed until it is the same thickness aS that of the base of a cup desired to he formed.
  • the matates tfatent ice terial displaced from the center of the disk 15 is forced outwardly around the end of the forming punch 16 which extends beyond the blanking punch 14, filling the space between the blanking punch 14 and the bottom of the die cavity 13.
  • the combined pressure of the blanking punch 1d and the forming punch 16 on the disk 15 overcomes the resistance of the backing punch 17, permitting the forming punch 16 to continue its descent and advance the central portion of the disk 15 into the opening 1S and against the backing punch 17 which now moves at the same rate as the forming punch.
  • the blanking punch descends simultaneously with the forming punch 16, compressing the metal within the die cavity 13 and uniformly forcing it toward the center of the disk where it is evenly formed into the side walls of a cup 19. l
  • the rate of movement between the blanking punch 14 and forming punch 16 is relative and may be varied as desired to produce the required iiow of metal into predetermined areas.
  • Blanking punch 14 forces the metal within the thickened marginal portion of the disk 15 into the opening 18 and stops upon reaching the bottom of its stroke, at which time the forming punch 16 also reaches the bottom of its stroke, thus completing the forming operation.
  • the backing punch 17 Upon withdrawal of the blanking punch 14 and the forming punch 16, the backing punch 17 will return to its initial position within the opening 15 as shown in FIGS. l-4.
  • the blanking punch 14 clears the die cavity 13 a suitable distance, it is stopped and continued movement of the forming punch 16 within the blanking punch 14 strips the cup 19 from the forming punch 16.
  • the metal strip 11 then is advanced to a position for a repeat operation.
  • the relative speed of the blanking punch 14 with respect to the fornung punch 16 and the lengths of their respective strokes may be varied to regulate the length 0f the cup las is required.
  • the sizes and shapes of the cups and the wall thicknesses thereof formed may be varied by a proper choice of diameters and congurations of the blanking punch ⁇ and the forming punch.
  • a method of cold formingmetal cups which comprises moving two coaxially mounted punches at the same Speed into engagement with a metal strip, blanking out a disk from said strip, inserting the disk into a die cavity, stopping one of said punches, forcing the second punch to engage the central portion of the disk whereby the central metal is displaced from the center to the periphery of the disk, and simultaneously advancing the two punches at different relative speeds whereby the material in the periphery is forced toward the displaced central portion to form a cup.
  • a method of forming a flanged cup by operating ⁇ a pair of coaxially mounted punches with a die which comprises, moving said punches in unison into engagement with a sheet material to blank out a disk from the material and advance the disk into the die, momentarily stop-V ping the outer punch at a predetermined distance from the bottom of the die, advancing the center punch relative to the outer punch to displace a portion of the central material of the disk toward the periphery thereof, advancing the center punch to further displace the central material of the disk, and simultaneously moving the outer punch at a slower rate than the center punch to extrude the previously displaced material into the space between the center punch and the die wall.
  • a method Vof forming a flanged cup With an annular applying afoce 4to'said annular punch to force the diswith respect to eachothe'r ⁇ so that the faces thereof are in theY same plane which comprises positioning' a sheet of material over a die having a cavity communicating with Ya coaxially extending opening, simultaneously advancing blanking'punch anda k,coaxial*forming punch positioned said punches to'sever a'disk from the materaLstOpping L its the annular punch, moving the disk out of engagement .with the annularpunch, and seating the diskon a step.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Description

Aug. 28, 1962 J. o. ETcHlsoN, JR., ETAL 3,050,849
METHOD OF COLD FORMING METAL Filed May 29, 1959 ATTORNEY 311513549 MBH-D 0F 01,13 ESRB/1W@ METAL john 0. Etchison, lr., Clemmons, and Erle M. Hutchins,
WinstonSem, N11., assignors to Western Electric Company, Incorporated, New York, NX., a corporation of New York Filed May 29, 1959, Ser. No. 816376 4 Claims. (Cl. 29-531-1) lThis invention relates to a method of cold forming metal and more particularly to a method of cold forming metal cups.
'It is an object of this invention to provide a method of cold forming metal into cups in a continuous operation.
A further object of this invention is to provide a method of cold forming metal into cups during a single forward stroke of a blanking and forming die.
A method of forming cups embodying certain features of this invention may include the steps of inserting a metal disk into a die, depressing the central portion of the disk while simultaneously thickening the marginal portions of the disk, advancing the central depressed portion of the disk to form a cup while simultaneously forcing the metal in the thickened marginal portion of the disk into the side wall of the cup being formed.
Other objects and advantages of the present invention will become apparent from the following detailed description when taken in conjunction with the following drawings, wherein:
FIG. 1 is a cross-sectional view of a press supporting a metal plate in a blanking position;
PIG. 2 is a cross-sectional view of the press showing a metal disk being blanked out of the metal plate and inserted into a forming die by a blanking punch;
FIG. 3 is a cross-sectional View of the press showing the disk as it is bottomed on the forming die by a forming punch mounted within the blanking punch;
`FIG. 4 is a cross-sectional view of the press showing the central portion of the disk being depressed and the marginal portion being thickened by the forming punch;
FIG. 5 is a cross-sectional View of the press showing the central portion of the disk as it is advanced by the forming punch; and
FIG. 6 is a cross-sectional View of the press showing the forming punch in a withdrawn position and the metal cup as it is stripped therefrom.
Referring to the drawings, a `strip of sheet metal 11, or other like material from which it is desired to form a cup-like receptacle, is shown supported on a rigidly xed forming die 12 and over a cylindrical die cavity 13 formed in the die 12. A vertically supported cylindrical blanking punch 14 of a diameter slightly less than that of the die cavity 13 is reciprocated by any suitable means, not shown, to blank out a cylindrical disk of any desired diameter'7 as determined by the diameter of the blanking punch, and force it into the die cavity 13. The diameter of the disk determines the volume of the cornpleted cup.
The blanking punch 14 is stopped before the disk 15 bottoms in the die cavity 13. A forming punch 16, mounted axially with the blanking punch 14 and reciprocated in a continuous stroke at a constant speed correspending to that of the blanking punch by suitable means, not shown, continues its descent after punch 14 is stopped and bottoms the disk 15 within the die cavity 13 and against a spring-biased backing punch 17 which extends to the bottom of die cavity 13 through an opening 1S in the forming die 12.
As the forming punch 16 continues to descend against the resistance of the backing punch 1'7, the center portion of the disk is depressed until it is the same thickness aS that of the base of a cup desired to he formed. The matates tfatent ice terial displaced from the center of the disk 15 is forced outwardly around the end of the forming punch 16 which extends beyond the blanking punch 14, filling the space between the blanking punch 14 and the bottom of the die cavity 13.
After the marginal portion of the disk 15 Ibecomes thickened, the combined pressure of the blanking punch 1d and the forming punch 16 on the disk 15 overcomes the resistance of the backing punch 17, permitting the forming punch 16 to continue its descent and advance the central portion of the disk 15 into the opening 1S and against the backing punch 17 which now moves at the same rate as the forming punch. The blanking punch descends simultaneously with the forming punch 16, compressing the metal within the die cavity 13 and uniformly forcing it toward the center of the disk where it is evenly formed into the side walls of a cup 19. l The rate of movement between the blanking punch 14 and forming punch 16 is relative and may be varied as desired to produce the required iiow of metal into predetermined areas.
Blanking punch 14 forces the metal within the thickened marginal portion of the disk 15 into the opening 18 and stops upon reaching the bottom of its stroke, at which time the forming punch 16 also reaches the bottom of its stroke, thus completing the forming operation. Upon withdrawal of the blanking punch 14 and the forming punch 16, the backing punch 17 will return to its initial position within the opening 15 as shown in FIGS. l-4. When the blanking punch 14 clears the die cavity 13 a suitable distance, it is stopped and continued movement of the forming punch 16 within the blanking punch 14 strips the cup 19 from the forming punch 16. The metal strip 11 then is advanced to a position for a repeat operation.
It is to be understood that they above-described method of cold forming metal is simply illustrative of one application of the broad principles of the invention. For eX- ample, the relative speed of the blanking punch 14 with respect to the fornung punch 16 and the lengths of their respective strokes may be varied to regulate the length 0f the cup las is required. Further, the sizes and shapes of the cups and the wall thicknesses thereof formed may be varied by a proper choice of diameters and congurations of the blanking punch `and the forming punch.
What is claimed is:
l. A method of cold formingmetal cups which comprises moving two coaxially mounted punches at the same Speed into engagement with a metal strip, blanking out a disk from said strip, inserting the disk into a die cavity, stopping one of said punches, forcing the second punch to engage the central portion of the disk whereby the central metal is displaced from the center to the periphery of the disk, and simultaneously advancing the two punches at different relative speeds whereby the material in the periphery is forced toward the displaced central portion to form a cup.
2. A method of forming a flanged cup by operating `a pair of coaxially mounted punches with a die which comprises, moving said punches in unison into engagement with a sheet material to blank out a disk from the material and advance the disk into the die, momentarily stop-V ping the outer punch at a predetermined distance from the bottom of the die, advancing the center punch relative to the outer punch to displace a portion of the central material of the disk toward the periphery thereof, advancing the center punch to further displace the central material of the disk, and simultaneously moving the outer punch at a slower rate than the center punch to extrude the previously displaced material into the space between the center punch and the die wall.
3. A method of forming a flanged cup with an annular blanking punch and a coaxial forming punch positioned atx-*50,8419
ing with a coaxially extending opening, advancing said punches inj unisonVV to sever a disk from the materiaLstopping the annular punch While advancing the forming punch to seat the disk cna step formed between the cavk,ity andopeningso that Vsaid annular @inch is spaced from the top of the disk, applying a counterfrorcethrough said opening to` opposedisplacement of the disk into said opening, applying a force Vto said lforming punch to displace-the material of .the ,center of the disk into the space formedihetween the disk and said annular punch, applying a force to said forming punch to overcome the coun- Y `ter force todraW the disk into said opening, and then placed material into said opening. r A 1 1 `4. A method Vof forming a flanged cup With an annular applying afoce 4to'said annular punch to force the diswith respect to eachothe'r `so that the faces thereof are in theY same plane which comprises positioning' a sheet of material over a die having a cavity communicating with Ya coaxially extending opening, simultaneously advancing blanking'punch anda k,coaxial*forming punch positioned said punches to'sever a'disk from the materaLstOpping L its the annular punch, moving the disk out of engagement .with the annularpunch, and seating the diskon a step.Y
formed between the cavity and opening so that said annular punch is spaced from the disk, applying a counterV force through said opening to oppose' displacement of the disk into said opening, applying a forceto said forming punchr to displace themateral of the center VofV the disk Y into the space formed betwen the disk and said annular punch, applying al force Yto said forming punch to'over'- come the counter force to draw the disk Vinto saidopening, and then simultaneously applying aforce 'to said an` nular punch to force the displaced material into said j opening.
References Cited in the le of this patent UNTED STATES PATENTS,
US816976A 1959-05-29 1959-05-29 Method of cold forming metal Expired - Lifetime US3050849A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3158931A (en) * 1962-01-22 1964-12-01 Bendix Corp Process for fixedly locating a member in a bore
US3195769A (en) * 1961-08-31 1965-07-20 Gerald A Miller Burst diaphragm and method of making same
US3197857A (en) * 1962-12-21 1965-08-03 Nippert Electric Products Comp Method of producing cup-shaped conductive semi-conductor housing
US3365926A (en) * 1964-11-17 1968-01-30 Monarch Rubber Company Manufacture of plate metal parts with integral threaded fasteners
US3387481A (en) * 1964-12-11 1968-06-11 Harvey Aluminum Inc Process for the deformation of sheet material
US4245491A (en) * 1976-10-21 1981-01-20 Kabushiki Kaisha Wako Method and device for producing hollow articles having flanges
FR2479042A1 (en) * 1980-03-27 1981-10-02 Modine Mfg Co METHOD AND APPARATUS FOR FORMING POCKETS AND COLLARS FROM MATERIAL IN A SHEET AND PRODUCT OBTAINED
US4356717A (en) * 1976-04-02 1982-11-02 Honda Giken Kogyo Kabushiki Kaisha Method and apparatus for forge-shaping sheet members
US5519934A (en) * 1991-11-13 1996-05-28 Eckold Gmbh & Co. Kg Method and apparatus for local forming of brittle material
US6122814A (en) * 1997-12-11 2000-09-26 Firma Carl Freudenberg Method for forming a ring with a chamfered section
CN108856479A (en) * 2018-05-07 2018-11-23 广东智科精创科技股份有限公司 The technique of punching press positioning column on a kind of plate

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1348007A (en) * 1919-06-10 1920-07-27 William C Huntoon Die for extruding collapsible tubes
US1925823A (en) * 1928-03-22 1933-09-05 Singer Fritz Manufacture of casings
US2343253A (en) * 1941-02-12 1944-03-07 Bridgeport Brass Co Method of preparing blanks for producing containers such as metallic cartridge casesor the like
FR1102764A (en) * 1953-06-24 1955-10-25 Kellver A G Method and device for the manufacture of hollow bodies, seamless, open on one side
US2814863A (en) * 1954-11-01 1957-12-03 Haut Rhin Manufacture Machines Method of forming metal cups, out of which hollow metal bodies with closed bottom can be manufactured by further drawing

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1348007A (en) * 1919-06-10 1920-07-27 William C Huntoon Die for extruding collapsible tubes
US1925823A (en) * 1928-03-22 1933-09-05 Singer Fritz Manufacture of casings
US2343253A (en) * 1941-02-12 1944-03-07 Bridgeport Brass Co Method of preparing blanks for producing containers such as metallic cartridge casesor the like
FR1102764A (en) * 1953-06-24 1955-10-25 Kellver A G Method and device for the manufacture of hollow bodies, seamless, open on one side
US2814863A (en) * 1954-11-01 1957-12-03 Haut Rhin Manufacture Machines Method of forming metal cups, out of which hollow metal bodies with closed bottom can be manufactured by further drawing

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3195769A (en) * 1961-08-31 1965-07-20 Gerald A Miller Burst diaphragm and method of making same
US3158931A (en) * 1962-01-22 1964-12-01 Bendix Corp Process for fixedly locating a member in a bore
US3197857A (en) * 1962-12-21 1965-08-03 Nippert Electric Products Comp Method of producing cup-shaped conductive semi-conductor housing
US3365926A (en) * 1964-11-17 1968-01-30 Monarch Rubber Company Manufacture of plate metal parts with integral threaded fasteners
US3387481A (en) * 1964-12-11 1968-06-11 Harvey Aluminum Inc Process for the deformation of sheet material
US4356717A (en) * 1976-04-02 1982-11-02 Honda Giken Kogyo Kabushiki Kaisha Method and apparatus for forge-shaping sheet members
US4245491A (en) * 1976-10-21 1981-01-20 Kabushiki Kaisha Wako Method and device for producing hollow articles having flanges
US4400964A (en) * 1976-10-21 1983-08-30 Kabushiki Kaisha Wako Method and device for continuous production of flanged hollow article
FR2479042A1 (en) * 1980-03-27 1981-10-02 Modine Mfg Co METHOD AND APPARATUS FOR FORMING POCKETS AND COLLARS FROM MATERIAL IN A SHEET AND PRODUCT OBTAINED
US5519934A (en) * 1991-11-13 1996-05-28 Eckold Gmbh & Co. Kg Method and apparatus for local forming of brittle material
US6122814A (en) * 1997-12-11 2000-09-26 Firma Carl Freudenberg Method for forming a ring with a chamfered section
CN108856479A (en) * 2018-05-07 2018-11-23 广东智科精创科技股份有限公司 The technique of punching press positioning column on a kind of plate

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