US3595047A - Method of forming o-ring grooves - Google Patents

Method of forming o-ring grooves Download PDF

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Publication number
US3595047A
US3595047A US800575A US3595047DA US3595047A US 3595047 A US3595047 A US 3595047A US 800575 A US800575 A US 800575A US 3595047D A US3595047D A US 3595047DA US 3595047 A US3595047 A US 3595047A
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United States
Prior art keywords
tube
resilient member
die
plunger
forming
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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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US800575A
Inventor
William K Fanning
Vincent R Hodel
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Caterpillar Inc
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Caterpillar Tractor Co
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Publication of US3595047A publication Critical patent/US3595047A/en
Assigned to CATERPILLAR INC., A CORP. OF DE. reassignment CATERPILLAR INC., A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CATERPILLAR TRACTOR CO., A CORP. OF CALIF.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21D15/00—Corrugating tubes
    • B21D15/04—Corrugating tubes transversely, e.g. helically
    • B21D15/10—Corrugating tubes transversely, e.g. helically by applying fluid pressure
    • B21D15/105—Corrugating tubes transversely, e.g. helically by applying fluid pressure by applying elastic material
    • 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
    • B21D22/105—Stamping using yieldable or resilient pads of tubular products
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49938—Radially expanding part in cavity, aperture, or hollow body
    • Y10T29/4994—Radially expanding internal tube

Definitions

  • Herbst Altarney--Fryer, Tjensvold, Feix, Phillips & Lempio ABSTRACT A method of forming O-ring grooves in a tube; inserting an end of the tube within a die and pulling or pushing a plunger against a cylindrical resilient member, forcing the resilient member to exert a pressure against the walls of the tube, thereby forcing the tube against the die surfaces.
  • FIG. 1 is a sectional view of an embodiment of apparatus which may be utilized to form the O-ring grooves according to the method of the present invention, with the parts in position prior to formation of the groove;
  • FIG. 2 is a view similar to FIG. 1 with the parts in position upon completion of formation of the groove.
  • a tube is inserted into a pair of identical split dies 12 and 14 until it abuts against a stop 18 in a collar 20 which is immediately adjacent the split dies.
  • the resilient member 21 may be manufactured from urethane or any suitable resilient material. It is preferred that the material utilized be able to regain its original shape upon completion of the method described herein. This will allow the cylindrical member to be reused, providing greater economy.
  • hydraulic pressure is applied to a plunger 22 extending through the member 21 so as to cause the head 24 of the plunger to compress the resilient material. Since the resilient material is confined between the tube and the collar, the hydraulic pressure causes the thin wall of the tubing to yield and take the shape of the inside diameter of the die cavity 26.
  • a solid, cylindrically shaped resilient member could be used and the hydraulic force may be applied to a piston, which replaces head 24, so that the plunger shank would not be needed.
  • a method of simultaneously grooving and flaring out the end of a tube to a diameter which is greater than its diameter prior to forming comprising the steps of placing the tube within a die such that the tube end is radially adjacent one of a plurality of spaced circumferential grooves in said die, placing a resilient member within the tube and confiningthe resilient member within the tube and exerting a force on the resilient member in a direction coincident with the tube axis, thereby causing said resilient member to expand radially and deform the tube into each of said grooves whereby forming of O-ring grooves in the tube wall and flaring of the tube end to a diameter which is greater than its diameter prior to forming occurs simultaneously.
  • the method of claim 2 including the step of positioning a plunger head in the tube and adjacent the resilient member and moving the plunger head against the resilient member to exert the force thereon.
  • the method ofclaim 2 including the steps of positioning a plunger so as to extend through an aperture in the resilient member, thereby positioning a plunger head against the resilient material, and drawing upon the plunger so that its head moves against the resilient member to exert the force thereon.
  • the method of claim 1 including the steps of abutting the tube and the resilient member against a collar situated at one end of the die, and drawing a plunger through the resilient material and the collar so as to accomplish the step ofexerting a force on the resilient member by confining the resilient member between a head on the plunger, the collar, and the die cavity and decreasing the distance between the plunger head and the collar.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Tyre Moulding (AREA)

Abstract

A method of forming O-ring grooves in a tube; inserting an end of the tube within a die and pulling or pushing a plunger against a cylindrical resilient member, forcing the resilient member to exert a pressure against the walls of the tube, thereby forcing the tube against the die surfaces.

Description

United States Patent William K. Fanning Morton:
Vincent R. I-lodel. Roanoke, both of, III. 800,575
Feb. 19, 1969 July 27, 197 1 Caterpillar Tractor Co.
Peoria, 111.
Inventors Appl. No. Filed Patented Assignee METHOD OF FORMING O-RING GROOVES 5 Claims, 2 Drawing Figs.
29/523, 72/370 Int. Cl BZld 13/06 Field of Search 72/54, 57,
[56] References Cited UNITED STATES PATENTS 2,417,202 3/1947 Hull et a1. 72/62 2,458,854 1/1949 Hu" et a1. 72/58 2,704,104 3/1955 Mueller 72/58 FOREIGN PATENTS 639,103 6/1950 Great Britain 72/62' Primary Examiner-Richard J. Herbst Altarney--Fryer, Tjensvold, Feix, Phillips & Lempio ABSTRACT: A method of forming O-ring grooves in a tube; inserting an end of the tube within a die and pulling or pushing a plunger against a cylindrical resilient member, forcing the resilient member to exert a pressure against the walls of the tube, thereby forcing the tube against the die surfaces.
PATENTEDJUL27I9?! 3,595,047
INVENTOR S WILLIAM K. FANNING VINCENT Hi, HODEL BY '7: w w, m 747% METHOD OF FORMING O-RING GROOVES BACKGROUND AND SUMMARY OF THE INVENTION This invention relates to the formation of O-ring grooves in tubing.
In the conventional methods of manufacturing O-ring I grooves, such as the machining of connectors which are then brazed to tubes, two-step die upsetting, and similar methods, problems have long been encountered in the high cost of manufacture, waste of material, and addition of unnecessary weight to the product.
The method disclosed in this application is preferred over any of the known methods since only one operation is required and the groove may be formed out on the tube wall without adding extra material to the product.
Therefore it is an object of this invention to provide a method of forming O-ring grooves on tubing.
It is also an object of this invention to provide such a method which greatly reduces the cost of forming such grooves.
It is a further object of this invention to disclose such a method in which the parts utilized to form the grooves are reusable.
Other objects and advantages of the present invention will become apparent from the following description and claims as illustrated in the accompanying drawing which, by way of illustration, shows a preferred embodiment of the present inverition and principles thereof and what is now considered to be the best mode contemplated for applying these principles. It is recognized that other embodiments of the invention utilizing the same or equivalent principles may be used, and structural changes may be made as desired by those skilled in the art, without departing from the present invention and purview of the appended claims.
BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a sectional view of an embodiment of apparatus which may be utilized to form the O-ring grooves according to the method of the present invention, with the parts in position prior to formation of the groove; and
FIG. 2 is a view similar to FIG. 1 with the parts in position upon completion of formation of the groove.
DETAILED DESCRIPTION OF THE DRAWING As shown in HO. 1, a tube is inserted into a pair of identical split dies 12 and 14 until it abuts against a stop 18 in a collar 20 which is immediately adjacent the split dies.
A hollow, cylindrically shaped slug of resilient material 21, having an outside diameter approximately equal to the inside diameter of the tube and an inside diameter approximately equal to the inside diameter of the collar 20, is placed in the tube and within the die as shown.
The resilient member 21 may be manufactured from urethane or any suitable resilient material. It is preferred that the material utilized be able to regain its original shape upon completion of the method described herein. This will allow the cylindrical member to be reused, providing greater economy.
With the two halves of the split die 12 and 14 secured so as to prevent their separation, hydraulic pressure is applied to a plunger 22 extending through the member 21 so as to cause the head 24 of the plunger to compress the resilient material. Since the resilient material is confined between the tube and the collar, the hydraulic pressure causes the thin wall of the tubing to yield and take the shape of the inside diameter of the die cavity 26.
If desired, a solid, cylindrically shaped resilient member could be used and the hydraulic force may be applied to a piston, which replaces head 24, so that the plunger shank would not be needed.
Although only one embodiment ofa machine which may be utilized to practice the present invention has been disclosed, it Will be obvious to those skilled in the art that a great number of machines can be utilized to practice the invention, without exceeding the purview of the following claims.
What we claim is:
1. A method of simultaneously grooving and flaring out the end of a tube to a diameter which is greater than its diameter prior to forming which is accomplished from within comprising the steps of placing the tube within a die such that the tube end is radially adjacent one of a plurality of spaced circumferential grooves in said die, placing a resilient member within the tube and confiningthe resilient member within the tube and exerting a force on the resilient member in a direction coincident with the tube axis, thereby causing said resilient member to expand radially and deform the tube into each of said grooves whereby forming of O-ring grooves in the tube wall and flaring of the tube end to a diameter which is greater than its diameter prior to forming occurs simultaneously.
2. The method of claim 1 including the step of abutting one end of the tube against a stop adjacent one end of the die when placing the tube within the die.
3. The method of claim 2 including the step of positioning a plunger head in the tube and adjacent the resilient member and moving the plunger head against the resilient member to exert the force thereon.
4. The method ofclaim 2 including the steps of positioning a plunger so as to extend through an aperture in the resilient member, thereby positioning a plunger head against the resilient material, and drawing upon the plunger so that its head moves against the resilient member to exert the force thereon.
5. The method of claim 1 including the steps of abutting the tube and the resilient member against a collar situated at one end of the die, and drawing a plunger through the resilient material and the collar so as to accomplish the step ofexerting a force on the resilient member by confining the resilient member between a head on the plunger, the collar, and the die cavity and decreasing the distance between the plunger head and the collar.
323? UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,595,0 4? Dated July 27, 97
Inventor(s) WILT-TAM K. FANNING, et a1 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:
Claim 1, line 6, after "die", insert --and the tube wall is radially adjacent a second one of a plurality of spaced circumferential grooves in said die-.
Signed and sealed this 1 8th day of January 1 972.
(SEAL) Atte st:
EDWARD M.FLETCHER,JR. ROBERT GOTTSCHALK Attesting Officer Acting Commissioner of Patents

Claims (5)

1. A method of simultaneously grooving and flaring out the end of a tube to a diameter which is greater than its diameter prior to forming which is accomplished from within comprising the steps of placing the tube within a die such that the tube end is radially adjacent one of a plurality of spaced circumferential grooves in said die, placing a resilient member within the tube and confining the resilient member within the tube and exerting a force on the resilient member in a direction coincident with the tube axis, thereby causing said resilient member to expand radially and deform the tube into each of said grooves whereby forming of O-ring grooves in the tube wall and flaring of the tube end to a diameter which is greater than its diameter prior to forming occurs simultaneously.
2. The method of claim 1 including the step of abutting one end of the tube against a stop adjacent one end of the die when placing the tube within the die.
3. The method of claim 2 including the step of positioning a plunger head in the tube and adjacent the resilient member and moving the plunger head against the resilient member to exert the force thereon.
4. The method of claim 2 including the steps of positioning a plunger so as to extend through an aperture in the resilient member, thereby positioning a plunger head against the resilient material, and drawing upon the plunger so that its head moves against the resilient member to exert the force thereon.
5. The method of claim 1 including the steps of abutting the tube and the resilient member against a collar situated at one end of the die, and drawing a plunger through the resilient material and the collar so as to accomplish the step of exerting a force on the resilient member by confining the resilient member between a head on the plunger, the collar, and the die cavity and decreasing the distance between the plunger head and the collar.
US800575A 1969-02-19 1969-02-19 Method of forming o-ring grooves Expired - Lifetime US3595047A (en)

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GB (1) GB1281672A (en)

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3744115A (en) * 1971-09-09 1973-07-10 Dow Chemical Co Apparatus for the flanging of lined conduit
JPS4921371A (en) * 1972-06-20 1974-02-25
JPS4952757A (en) * 1972-09-25 1974-05-22
US3815394A (en) * 1971-09-15 1974-06-11 Elbows Automatic Inc Machine and method for forming tubular adjustable elbows
US3866457A (en) * 1973-08-24 1975-02-18 Caterpillar Tractor Co Method and apparatus for tube forming
JPS5217335U (en) * 1975-07-24 1977-02-07
US4068372A (en) * 1976-02-18 1978-01-17 Hitachi, Ltd. Tube expander
US4235013A (en) * 1978-10-30 1980-11-25 Westinghouse Electric Corp. Tube guide-expander
US4387507A (en) * 1981-04-20 1983-06-14 Haskel Engineering & Supply Co. Method and apparatus for radially expanding tubes
US4641407A (en) * 1985-05-14 1987-02-10 The Boeing Company Tooling for elastomeric swaging machine
EP0441174A2 (en) * 1990-02-09 1991-08-14 Metallwarenfabrik Schelklingen GmbH Method and form tool for heading a nipple
US5823031A (en) * 1996-11-20 1998-10-20 Tools For Bending, Inc. Method and apparatus for bulge forming and bending tubes
US6523261B1 (en) * 1999-07-22 2003-02-25 Mapress Gmbh & Co. Kg Method of making a metallic press fitting element
US20030209047A1 (en) * 2002-05-07 2003-11-13 Nelepovitz Donald Owen Die apparatus and method for high temperature forming of metal products
US20040107754A1 (en) * 2001-02-08 2004-06-10 Egbert Frenken Expansion tool for expanding tube ends and pressing device comprising such an expansion tool
US20060117830A1 (en) * 2004-11-30 2006-06-08 Hwang Peter K Transition forming machine
US20090041882A1 (en) * 2007-06-05 2009-02-12 Greg Sabourin Elastomeric seal sizer
US20090174182A1 (en) * 2008-01-04 2009-07-09 Michael Duggan Fluid conduits with integral end fittings and associated methods of manufacture and use
US20090173130A1 (en) * 2008-01-04 2009-07-09 Cerro Flow Products, Inc. Fluid conduits with integral end fittings and associated methods of manufacture and use
US20090293579A1 (en) * 2008-05-28 2009-12-03 The Boeing Company. Net-shaped duct forming apparatus and method
US8002139B1 (en) 2005-04-19 2011-08-23 Thermaco, Inc. Method of joining a plastic tube to another tube
RU2468878C1 (en) * 2011-04-12 2012-12-10 Федеральное государственное автономное образовательное учреждение высшего профессионального образования "Уральский федеральный университет имени первого Президента России Б.Н. Ельцина" Device for making fluted tubes
US8359725B1 (en) 2009-11-20 2013-01-29 The Boeing Company Single action swage
CN105057378A (en) * 2015-07-21 2015-11-18 郑祥钿 Convex shoulder forming device for cylindrical metal tubes
CN109848315A (en) * 2019-03-01 2019-06-07 西格迈股份有限公司 The split type moulding stamper and forming method of special-shaped surge drum
CN110227748A (en) * 2019-06-25 2019-09-13 中国航发贵州黎阳航空动力有限公司 A kind of minor diameter thin wall wavy metal pipe forming apparatus and method

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA747674B (en) * 1974-12-03 1976-01-28 P Herr Improvements in or relating to stanchions
NO148060C (en) * 1979-06-06 1983-08-03 Johnson Matthey Co Ltd METHOD AND APPARATUS FOR MANUFACTURE OF PIPE-TUBED COUPLES OF DUKTIL METAL
DE3409549A1 (en) * 1984-03-15 1985-09-26 Gesenkschmiede Schneider Gmbh, 7080 Aalen Method for the production of flanges or collars on hollow parts
DE3817707A1 (en) * 1988-05-25 1989-11-30 Guenter Otto METHOD AND DEVICE FOR DEFORMING MATERIAL LIKE HOLLOW PROFILES, TUBES, ETC.
DE4309932A1 (en) * 1993-03-26 1994-09-29 Hermann Bartels Method and device for deforming hollow profile workpieces
DE19600755C1 (en) * 1996-01-11 1997-04-10 Daimler Benz Ag Stackable drawn part, especially of sheet metal
US6006577A (en) * 1996-01-11 1999-12-28 Daimlerchrysler Ag Stackable drawn pieces and process and apparatus for manufacture thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2417202A (en) * 1943-05-20 1947-03-11 Parker Appliance Co Machine for beading or flanging tubes
US2458854A (en) * 1945-01-10 1949-01-11 Parker Appliance Co Machine for beading tubes by radial expansion followed by axial pressure
GB639103A (en) * 1948-05-12 1950-06-21 Harrison Venning Tool Company Improvements in metal tube expanders
US2704104A (en) * 1949-12-09 1955-03-15 Mueller Co Pipe expanding tool

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2417202A (en) * 1943-05-20 1947-03-11 Parker Appliance Co Machine for beading or flanging tubes
US2458854A (en) * 1945-01-10 1949-01-11 Parker Appliance Co Machine for beading tubes by radial expansion followed by axial pressure
GB639103A (en) * 1948-05-12 1950-06-21 Harrison Venning Tool Company Improvements in metal tube expanders
US2704104A (en) * 1949-12-09 1955-03-15 Mueller Co Pipe expanding tool

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3744115A (en) * 1971-09-09 1973-07-10 Dow Chemical Co Apparatus for the flanging of lined conduit
US3815394A (en) * 1971-09-15 1974-06-11 Elbows Automatic Inc Machine and method for forming tubular adjustable elbows
JPS4921371A (en) * 1972-06-20 1974-02-25
JPS571333B2 (en) * 1972-09-25 1982-01-11
JPS4952757A (en) * 1972-09-25 1974-05-22
US3866457A (en) * 1973-08-24 1975-02-18 Caterpillar Tractor Co Method and apparatus for tube forming
JPS5217335U (en) * 1975-07-24 1977-02-07
US4068372A (en) * 1976-02-18 1978-01-17 Hitachi, Ltd. Tube expander
US4235013A (en) * 1978-10-30 1980-11-25 Westinghouse Electric Corp. Tube guide-expander
US4387507A (en) * 1981-04-20 1983-06-14 Haskel Engineering & Supply Co. Method and apparatus for radially expanding tubes
US4641407A (en) * 1985-05-14 1987-02-10 The Boeing Company Tooling for elastomeric swaging machine
EP0441174A3 (en) * 1990-02-09 1992-01-15 Metallwarenfabrik Schelklingen Gmbh Method and form tool for heading a nipple
EP0441174A2 (en) * 1990-02-09 1991-08-14 Metallwarenfabrik Schelklingen GmbH Method and form tool for heading a nipple
US5823031A (en) * 1996-11-20 1998-10-20 Tools For Bending, Inc. Method and apparatus for bulge forming and bending tubes
US6523261B1 (en) * 1999-07-22 2003-02-25 Mapress Gmbh & Co. Kg Method of making a metallic press fitting element
US20040107754A1 (en) * 2001-02-08 2004-06-10 Egbert Frenken Expansion tool for expanding tube ends and pressing device comprising such an expansion tool
US7065995B2 (en) * 2001-02-08 2006-06-27 Gustav Klauke Gmbh Expansion tool for expanding tube ends and pressing device comprising such an expansion tool
US20030209047A1 (en) * 2002-05-07 2003-11-13 Nelepovitz Donald Owen Die apparatus and method for high temperature forming of metal products
US6910359B2 (en) * 2002-05-07 2005-06-28 Hi-Tech Welding Services, Inc. Die apparatus and method for high temperature forming of metal products
US20060117830A1 (en) * 2004-11-30 2006-06-08 Hwang Peter K Transition forming machine
US7287406B2 (en) * 2004-11-30 2007-10-30 The Boeing Company Transition forming machine
US8002139B1 (en) 2005-04-19 2011-08-23 Thermaco, Inc. Method of joining a plastic tube to another tube
US8062012B2 (en) * 2007-06-05 2011-11-22 Metaldyne, Llc Elastomeric seal sizer
US20090041882A1 (en) * 2007-06-05 2009-02-12 Greg Sabourin Elastomeric seal sizer
US20090174182A1 (en) * 2008-01-04 2009-07-09 Michael Duggan Fluid conduits with integral end fittings and associated methods of manufacture and use
US20090173130A1 (en) * 2008-01-04 2009-07-09 Cerro Flow Products, Inc. Fluid conduits with integral end fittings and associated methods of manufacture and use
US7942456B2 (en) 2008-01-04 2011-05-17 Cerro Flow Products, Inc. Fluid conduits with integral end fittings and associated methods of manufacture and use
US7987690B2 (en) 2008-01-04 2011-08-02 Cerro Flow Products Llc Fluid conduits with integral end fittings and associated methods of manufacture and use
US20090293579A1 (en) * 2008-05-28 2009-12-03 The Boeing Company. Net-shaped duct forming apparatus and method
US9296031B2 (en) * 2008-05-28 2016-03-29 The Boeing Company Net-shaped duct forming apparatus and method
US9623460B2 (en) 2008-05-28 2017-04-18 The Boeing Company Net-shaped duct forming apparatus
US8359725B1 (en) 2009-11-20 2013-01-29 The Boeing Company Single action swage
RU2468878C1 (en) * 2011-04-12 2012-12-10 Федеральное государственное автономное образовательное учреждение высшего профессионального образования "Уральский федеральный университет имени первого Президента России Б.Н. Ельцина" Device for making fluted tubes
CN105057378A (en) * 2015-07-21 2015-11-18 郑祥钿 Convex shoulder forming device for cylindrical metal tubes
CN105057378B (en) * 2015-07-21 2017-06-30 郑祥钿 A kind of convex shoulder shaped device of metal circular tube
CN109848315A (en) * 2019-03-01 2019-06-07 西格迈股份有限公司 The split type moulding stamper and forming method of special-shaped surge drum
CN110227748A (en) * 2019-06-25 2019-09-13 中国航发贵州黎阳航空动力有限公司 A kind of minor diameter thin wall wavy metal pipe forming apparatus and method
CN110227748B (en) * 2019-06-25 2021-02-23 中国航发贵州黎阳航空动力有限公司 Forming device and method for small-diameter thin-wall metal corrugated pipe

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Publication number Publication date
GB1281672A (en) 1972-07-12
BE746242A (en) 1970-08-19
FR2031527A1 (en) 1970-11-20
FR2031527B1 (en) 1974-03-15

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AS Assignment

Owner name: CATERPILLAR INC., A CORP. OF DE.,ILLINOIS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CATERPILLAR TRACTOR CO., A CORP. OF CALIF.;REEL/FRAME:004669/0905

Effective date: 19860515

Owner name: CATERPILLAR INC., 100 N.E. ADAMS STREET, PEORIA, I

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CATERPILLAR TRACTOR CO., A CORP. OF CALIF.;REEL/FRAME:004669/0905

Effective date: 19860515