US3528269A - Method of extrusion with liquidpressure and means for carrying out the method - Google Patents

Method of extrusion with liquidpressure and means for carrying out the method Download PDF

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Publication number
US3528269A
US3528269A US714159*A US3528269DA US3528269A US 3528269 A US3528269 A US 3528269A US 3528269D A US3528269D A US 3528269DA US 3528269 A US3528269 A US 3528269A
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US
United States
Prior art keywords
pressure
punch
pressure cylinder
billet
die
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
US714159*A
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English (en)
Inventor
Jan Nilsson
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.)
ABB Norden Holding AB
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ASEA AB
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Filing date
Publication date
Application filed by ASEA AB filed Critical ASEA AB
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Publication of US3528269A publication Critical patent/US3528269A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/007—Hydrostatic extrusion

Definitions

  • a pressure cylinder having a bore therethrough is arranged horizontally within a collapsible open-topped container for liquid. At one end of this container is arranged a rod having a central opening therethrough, the end of which fits into the bore of the cylinder, and carries a die. The other end of the container is connected to a hydraulic pressure piston which has a projecting plunger engaging in the other end of the bore in the pressure cylinder, with a spring on the end of this rod supporting a pressure member.
  • a billet is inserted into the bore and is pressed by the hydraulic pressure piston until the carrier for the rod connected to this piston engages the cylinder, whereupon the cylinder is caused to move along with the rod over the rod connected to the fixed end, so as to express the billet completely.
  • the present invention relates to a method of rod extrusion with fluid-pressure and means for carrying out the method.
  • the die With conventional means for carrying out rod extrusion with fluid-pressure the die is arranged at one end of the hollow space in a pressure cylinder while the billet-and afterwards the punch-is inserted at the other end.
  • the diameter of the billet is limited to a certain maximum value which is determined by the size of the rod cross section, fluid-pressure available and the material properties of the billet and which may not be exceeded if the billet material is to be extruded through the nozzle. Neither can the length of the billet be greater than the length of the punch, which length for reasons of strength must be limited to a certain maximum value determined by the diameter of the punch and the pressure used.
  • a method according to the invention is characterised in that a part of the billet is pressed through the die with the help of a first punch inserted at one end of the pressure cylinder, while said pressure cylinder is held in its initial position by a pull-back device, and the die is arranged at the other end of the pressure cylinder and mechanically connected to a stationary second punch provided with a central channel, after which said pressure cylinder, by means of a stopping disc on the punch-holder of the first punch, is pressed towards said second punch, after which the pressure piston and pressure cylinder are removed from the die and said second punch by means of said pull-back device, and a fresh billet is inserted in the die, after which the pressure cylinder and said first punch are returned to their initial positions and the cylinder space thus produced is supplied with the required quantity of fluid pressure medium.
  • the invention also relates to a means for carrying out the above-mentioned method, which means comprises a first punch connected to the pressure piston in a high pressure press and insertable into one end of the pressure cylinder, a container for pressure medium which can communicate with the pressure cylinder, a die to be suspended in the pressure cylinder and a pull-back means for axial movement of the pressure cylinder, characterised in that the device also comprises a second punch insertable at the other end of the pressure cylinder, said first punch is at its attachment end being furnished with a stopping surface facing an end surface of the pressure cylinder, and said second punch being rigidly arranged in relation to a fixed table, provided with a central channel for the extruded rod and mechanically connected to said die.
  • FIG. 1 designates the pressure piston of a hydraulic press having horizontal pressing directions and 2 the stationary table which is arranged with the surface in a vertical plane.
  • the device comprises a movable punch 3 and a stationary punch 4.
  • the stamp 3 is attached to the piston 1 by means of a clamping device 5 and the punch 4 to the fixed table 2.
  • the punches 3 and 4 are arranged to have by their active ends inserted into the respective ends of the pressure cylinder 6 which has a pressure chamber 7 in the form of a through-running axial bore.
  • the pressure cylinder 6 is displaceable in axial direction and can be set in the desired position by means of pull-back cylinders 8 in the fixed table and pistons, not shown in the figures.
  • the mechanical connection between the pistons of the operating cylinders and the pressure cylinder is effected by rods 9.
  • the die 10 is rigidly connected to the stationary punch 4 which is provided with a central channel 11 for the extruded rod, which also runs through a corresponding channel 12 in the fixed table.
  • the pressure punch 3 is provided with a stopping disc 17 which abuts the end of the pressure cylinder when the punch is fully inserted.
  • a spring 13 is attached by one end to the active end of the punch 3 and by its other end to a Washer 14 which has sufficient clearance in relation to the inner walls of the pressure cylinder for pressure medium to be able to flow in the gap.
  • the pressure cylinder 6 and the punches 3 and 4 are immersed in a bellows-like container 15 for pressure medium, which is flexible in horizontal direction and clamped by one end in the fixed table 2 and by the other end to the punch-holder 5.
  • the pressure medium 16 has a surface level which is higher than the upper edge of punches and the container 15 is open at the top so that the billet 16 can easily be placed in the tool.
  • the working cycle is as follows:
  • FIG. l.-The billet 16 is held by the spring 13 against the die 10 so that the fluid pressure does not influence the billet surface abutting the die.
  • the movable punch 3 is pressed into the pressure chamber 7 in the pressure cylinder 6 and the billet starts to be forced out through the die 10.
  • FIG. 2 The punch 3 is pressed with its entire active length into the pressure cylinder 6 and the pressure transfer between the piston 1 and the pressure cylinder 6 takes place through the stopping disc 17, whereupon the pressure cylinder 6 is set in movement in relation to the stationary punch 4 which is then pressed into the pressure chamber 7.
  • FIG. 3.--Pressing is completed.
  • FIG. 4. The pressure cylinder 6 and piston 1 are returned by the pull-back cylinders 8 to the position shown in FIG. 4.
  • the extruded rod is cut and the die 10 is rinsed or replaced by a new die. New billet is inserted and held between the pressure cylinder 6 and the die 10.
  • FIG. 5 The pressure piston is set in movement towards the stationary punch 2 so that the billet is clamped against the die by the spring 13 and the punch 3 is pressed out of the pressure cylinder so that the pressure cylinder and punch finally take up the same position as in FIG. 1.
  • a method of rod extrusion with fluid pressure by means of a mechanism which includes a pressure cylinder with a longitudinal bore arranged between a table and a pressure piston, a pull-back device, a hollow punch mounted on said table, a solid punch connected to said piston and having a stop surface at its base, and a die,
  • Device for rod extrusion with fluid pressure comprising a high pressure press with a pressure piston, a fixed table, a pressure cylinder with an axial bore, a die, a hollow punch, a solid punch, a pull-back means, stopping means for said solid punch, first punch fastening means for rigidly attaching said hollow punch to said table, second punch fastening means for rigidly attaching said solid punch to said pressure piston, said pull-back means including means movably supporting said pressure cylinder between said table and pressure piston, the center line of said bore coinciding .with the center line of said punches, said punches and said die being slidable in said bore, means rigidly attaching said die to said hollow punch, said stopping means including means to stop relative movement between said pressure cylinder and said solid punch at an intermediate extrusion stage and simultaneously establish a, force transferring connection between the pressure cylinder and the pressure piston, the pressure cylinder being movable under influence of the force transmitted, and the die being moved into said bore beginning at said intermediate extrusion stage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Forging (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
US714159*A 1967-03-03 1968-02-29 Method of extrusion with liquidpressure and means for carrying out the method Expired - Lifetime US3528269A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE3001/67A SE345816B (fr) 1967-03-03 1967-03-03

Publications (1)

Publication Number Publication Date
US3528269A true US3528269A (en) 1970-09-15

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Application Number Title Priority Date Filing Date
US714159*A Expired - Lifetime US3528269A (en) 1967-03-03 1968-02-29 Method of extrusion with liquidpressure and means for carrying out the method

Country Status (5)

Country Link
US (1) US3528269A (fr)
DE (1) DE1652574A1 (fr)
FR (1) FR1560697A (fr)
GB (1) GB1208971A (fr)
SE (1) SE345816B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3696652A (en) * 1969-10-01 1972-10-10 Western Electric Co Continuous material deformation process and apparatus therefor
US4023390A (en) * 1973-09-19 1977-05-17 Kobe Steel Ltd. Machine for use in hydrostatic extrusion

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3364716A (en) * 1965-07-07 1968-01-23 Fielding & Platt Ltd Extrusion apparatus
US3390563A (en) * 1965-12-09 1968-07-02 Western Electric Co Concentric band high pressure forming chambers
US3434320A (en) * 1966-02-04 1969-03-25 Atomic Energy Authority Uk Hydrostatic extrusion apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3364716A (en) * 1965-07-07 1968-01-23 Fielding & Platt Ltd Extrusion apparatus
US3390563A (en) * 1965-12-09 1968-07-02 Western Electric Co Concentric band high pressure forming chambers
US3434320A (en) * 1966-02-04 1969-03-25 Atomic Energy Authority Uk Hydrostatic extrusion apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3696652A (en) * 1969-10-01 1972-10-10 Western Electric Co Continuous material deformation process and apparatus therefor
US4023390A (en) * 1973-09-19 1977-05-17 Kobe Steel Ltd. Machine for use in hydrostatic extrusion

Also Published As

Publication number Publication date
GB1208971A (en) 1970-10-14
FR1560697A (fr) 1969-03-21
SE345816B (fr) 1972-06-12
DE1652574A1 (de) 1971-11-04

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