US3654785A - Liquid pressure bulge forming apparatus - Google Patents

Liquid pressure bulge forming apparatus Download PDF

Info

Publication number
US3654785A
US3654785A US6258A US3654785DA US3654785A US 3654785 A US3654785 A US 3654785A US 6258 A US6258 A US 6258A US 3654785D A US3654785D A US 3654785DA US 3654785 A US3654785 A US 3654785A
Authority
US
United States
Prior art keywords
pressure
pipe
piston rods
piston
liquid
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
Application number
US6258A
Other languages
English (en)
Inventor
Terumori Ueda
Tunemichi Imai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
National Institute of Advanced Industrial Science and Technology AIST
Original Assignee
Agency of Industrial Science and Technology
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Agency of Industrial Science and Technology filed Critical Agency of Industrial Science and Technology
Application granted granted Critical
Publication of US3654785A publication Critical patent/US3654785A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/28—Making tube fittings for connecting pipes, e.g. U-pieces
    • B21C37/29—Making branched pieces, e.g. T-pieces
    • B21C37/294—Forming collars by compressing a fluid or a yieldable or resilient mass in the tube
    • 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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/039—Means for controlling the clamping or opening of the moulds
    • 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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/041—Means for controlling fluid parameters, e.g. pressure or temperature
    • 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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/043—Means for controlling the axial pusher
    • 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
    • Y10T29/49805—Shaping by direct application of fluent pressure

Definitions

  • a pipe to be formed is placed into a die having a cavity corc l. ..72/2s,72 6 1 29g 1 responding to the form desired.
  • High pressure liquid is u I I I 8 I I l l I I I u u n v n 5 l l u 5 u I u [58] FieldofSearch ..72/57,58,60,6l,62,28 pressed thus bulging the pipe without heating it in the die cavity to the form desired.
  • the present invention relates to a liquid pressure bulge forming apparatus for a metal working process. More particularly, it relates to an apparatus for bulge forming pipe wherein the part of the pipe to the processed can be bulged to the form desired by conducting a high pressure liquid thereinto.
  • the present invention which is a further improvement of the prior art, provides a novel bulge forming apparatus of simpler construction with which machinery parts such as T-joints, expandable corrugated pipe, head lugs and seat lugs for bicycles, etc., can be efficiently produced at a low cost.
  • FIG. 1 is a front view, partly in section, of an apparatus incorporating the oil pressure piping system of the present invention
  • FIG. 2 is a side view of the above apparatus
  • FIG. 3 is a perspective view of a die for forming corrugated pipes.
  • FIG. 4 is a piping diagram for the continuously variable pressure regulator in accordance with the present invention.
  • metal pipe 1 cut to a proper length and having a polished surface is placed in lower die 2 fixed to frame 13.
  • Upper split die 2 fixed to piston 3 is then pressed down on die 2.
  • the split die has only one die cavity 15.
  • a plurality of die cavities can be provided, if they are the same in diameter. These cavities can further be formed as shown in FIG. 3 to make a die for the production of expandable corrugated pipe.
  • the pressure applied for sealing both ends of the pipe by piston rods 4 and 4' should be such that the pressure at the contact surfaces of the pipe 1 with piston rods 4 and 4' is higher than the pressure of the liquid introduced into pipe 1. At the same time, such pressure should be controlled so that the pipe is not axially deformed by excessive pressure. If the pipe is axially deformed at this step, the pipe will undergo work hardening which hinders proper bulge formation.
  • Liquid is supplied from low-pressure pump 26 through check valve 27, high pressure piping 25, high pressure connecting cylinder 5 fixed to frame 13 and high pressure liquid passage 29' within connecting rod 6' into and filling pipe 1 so that any existing air within pipe 1 is forced out through high pressure liquid passage 29 within connecting rod 6, high pressure connecting cylinder 5 fixed to frame 13, and high pressure pilot check valve 28 thus completely replacing the air by the liquid.
  • reaction offset means is provided. This reaction ofiset is effected by utilizing continuously variable pressure regulator 36 which as shown in FIG. 4 comprises lever 37, pressure ratio changing cylinder 32, buffer cylinder 39 and relief valve 38.
  • pressure ratio changing cylinder 32 can be set at a position along the side surface of lever 37 thereby determining the pushing force applied to relief valve 38 through buffer cylinder 39 and making it possible for the continuously variable pressure regulator to control the relationship between pressure P in the piping system for generating high pressure liquid by means of pump 21 and pressure I, in the piping system for reaction offset generated by pump 31 in accordance with the equation P m-P (where m is a parameter determined by the diameter of the pipe to be bulged).
  • the reaction force generated by the high pressure liquid introduced into pipe 1 is higher at the time of processing a pipe of large diameter than at the time of processing a pipe of small diameter, and the pushing force of pressure piston 20 due to the reaction force becomes higher.
  • cylinder 32 should be moved to a position closer to relief valve 38 as the diameter of the pipe becomes larger, thus increasing the pressure generated by pump 31 and applied on pressure piston 20. That is, an appropriate parameter m is selected by changing the position of cylinder 32 in accordance with the diameter of the pipe to be formed.
  • pressure P in the piping system for generating high pressure liquid and the pushing force of pressure piston 20, namely, pressure P; in the piping system for reaction ofiset are maintained in a proportional relation, whereby breaking of the seal is prevented.
  • knock-out piston 34 is operated by the liquid pressure supplied by pump 35 after upper die 2 is elevated, such elevation being effected by liquid pressure from pump 43 to the lower inlet of die clamping cylinder 44. The product can then be removed from lower die 2'.
  • the shape of cam 11 is of symmetrical shape and the pipe is compressed an equal length on both ends.
  • the bulge formation on a pipe having different diameters at both ends thereof can be easily achieved by making the inclined surfaces of said links unsymmetrical in accordance with the difference in the diameters of the ends of the pipe to be processed and thus making degree of compression different at each end.
  • guide plates 13 serving also as space plates on frame 13 are provided at the lower portions of the cam.
  • Pressure indicators are provided at the sides where these guide plates face with each other. Pressure indicators 30 indicate any unbalance in the links moving downwardly. When indicators 30 detect over a predetermined degree of pressure the machine is automatically shut down and the safety of the apparatus is thus always maintained.
  • the link mechanism of the present invention is of more simple construction than the conventional mechanism. Further, if both sides of the cam of the link mechanism are formed to have an inclination corresponding to the pressure force respectively exerted at the pipe ends, a pipe having different diameters at both ends thereof can be easily formed.
  • a liquid bulge forming apparatus comprising a die comprising a plurality of members with cavities of various shapes which hold a pipe to be formed therein and permit bulging of said pipe to a desired form,
  • a stepless and continuously variable reaction offset means for preventing a break of the seal between said piston rods and said pipe when introducing said high pressure liquid into said pipe
  • a safety means responsive to the pressure in said pipe and for shutting down said apparatus when said pressure exceeds predetermined pressures
  • reaction offset means constitutes a continuously variable pressure regulator comprising, a one-armed lever
  • a pressure ratio changing cylinder freely settable at any position along the surface of said lever wherein the position at which said pressure ratio changing cylinder is set determines the ratio between the pressure for forming the bulge and the pressure operatively applied to said means for causing said piston rods to move forward.
  • said safety means comprises,
  • pressure indicator means disposed at the sides of said guide plates where the latter face each other and for detecting pressures over predetermined pressures and for shutting down said apparatus thereupon.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
US6258A 1969-01-29 1970-01-27 Liquid pressure bulge forming apparatus Expired - Lifetime US3654785A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44006516A JPS4841427B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1969-01-29 1969-01-29

Publications (1)

Publication Number Publication Date
US3654785A true US3654785A (en) 1972-04-11

Family

ID=11640554

Family Applications (1)

Application Number Title Priority Date Filing Date
US6258A Expired - Lifetime US3654785A (en) 1969-01-29 1970-01-27 Liquid pressure bulge forming apparatus

Country Status (3)

Country Link
US (1) US3654785A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS4841427B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1280252A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2472428A1 (fr) * 1979-12-27 1981-07-03 Mo Aviat I Installation pour la fabrication de tubes a parois gaufrees
FR2472429A1 (fr) * 1979-12-27 1981-07-03 Mo Aviat I Installation pour la fabrication de tubes a parois gaufrees
US5865054A (en) * 1989-08-24 1999-02-02 Aquaform Inc. Apparatus and method for forming a tubular frame member
US6006567A (en) * 1997-05-15 1999-12-28 Aquaform Inc Apparatus and method for hydroforming
US6502822B1 (en) 1997-05-15 2003-01-07 Aquaform, Inc. Apparatus and method for creating a seal on an inner wall of a tube for hydroforming

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1530000A (en) * 1924-03-27 1925-03-17 John J Kauffman Drawing die
US3072085A (en) * 1959-05-08 1963-01-08 American Radiator & Standard Method and apparatus for producing hollow articles
US3335590A (en) * 1964-08-07 1967-08-15 Boeing Co Accurate control system for axial load bulge forming
US3350905A (en) * 1963-12-21 1967-11-07 Agency Ind Science Techn Liquid pressure bulge forming apparatus
US3358488A (en) * 1965-06-03 1967-12-19 Western Electric Co Method and apparatus for increasing the ductility of an article during a forming operation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1530000A (en) * 1924-03-27 1925-03-17 John J Kauffman Drawing die
US3072085A (en) * 1959-05-08 1963-01-08 American Radiator & Standard Method and apparatus for producing hollow articles
US3350905A (en) * 1963-12-21 1967-11-07 Agency Ind Science Techn Liquid pressure bulge forming apparatus
US3335590A (en) * 1964-08-07 1967-08-15 Boeing Co Accurate control system for axial load bulge forming
US3358488A (en) * 1965-06-03 1967-12-19 Western Electric Co Method and apparatus for increasing the ductility of an article during a forming operation

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2472428A1 (fr) * 1979-12-27 1981-07-03 Mo Aviat I Installation pour la fabrication de tubes a parois gaufrees
FR2472429A1 (fr) * 1979-12-27 1981-07-03 Mo Aviat I Installation pour la fabrication de tubes a parois gaufrees
US5865054A (en) * 1989-08-24 1999-02-02 Aquaform Inc. Apparatus and method for forming a tubular frame member
US6006567A (en) * 1997-05-15 1999-12-28 Aquaform Inc Apparatus and method for hydroforming
US6502822B1 (en) 1997-05-15 2003-01-07 Aquaform, Inc. Apparatus and method for creating a seal on an inner wall of a tube for hydroforming

Also Published As

Publication number Publication date
JPS4841427B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-12-06
GB1280252A (en) 1972-07-05

Similar Documents

Publication Publication Date Title
US3350905A (en) Liquid pressure bulge forming apparatus
US3914975A (en) Hydraulic press brake
US3509754A (en) Method and apparatus for deep drawing metal
US3478565A (en) Forging machine
GB2057322A (en) Process and apparatus for the formation of hollow objects having varying cross section
US3654785A (en) Liquid pressure bulge forming apparatus
US2580078A (en) Press mechanism
US3757555A (en) Can body expanding and flanging apparatus
US3358488A (en) Method and apparatus for increasing the ductility of an article during a forming operation
US3734673A (en) Die casting and like apparatus
US5445004A (en) Extrusion method with gas evacuation, and extrusion press
US2302953A (en) Method of metal stretching, using blank-holder types of presses
US2799317A (en) Resilient wheel apparatus and method for forming strip material
US2553092A (en) Apparatus for stretch-bending work in different directions under a predetermined tension
US1861337A (en) Hydraulic metal drawing press
US3831414A (en) Means for making pulleys
US2673480A (en) Apparatus for shaping bimetallic articles
US3651683A (en) Cold moulding press
US3702555A (en) Press for hot hydrostatic extrusion
US4549421A (en) Method and apparatus for reducing the section of elongated components
RU1814942C (ru) Устройство дл выдавливани длинномерных изделий
PL169841B1 (pl) Sposób i urzadzenie do ksztaltowania blachy z zastosowaniem plynnego podloza PL
US3677049A (en) Method of and appratus for positive fluid flow extrusion
SU871989A1 (ru) Устройство дл выдавливани
SU1747224A1 (ru) Способ волочени изделий, преимущественно коротких, в режиме гидродинамического трени и устройство дл его осуществлени