US3698220A - Press for hot hydrostatic extrusion - Google Patents

Press for hot hydrostatic extrusion Download PDF

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Publication number
US3698220A
US3698220A US145183A US3698220DA US3698220A US 3698220 A US3698220 A US 3698220A US 145183 A US145183 A US 145183A US 3698220D A US3698220D A US 3698220DA US 3698220 A US3698220 A US 3698220A
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US
United States
Prior art keywords
die
billet
pressure
pressure chamber
extrusion
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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
Application number
US145183A
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English (en)
Inventor
Jan Nilsson
Hans Larker
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ABB Norden Holding AB
Original Assignee
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 US3698220A publication Critical patent/US3698220A/en
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    • 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

  • ABSTRACT A press for hot hydrostatic extrusion of a billet, has a stand, a pressure chamber axially movable in the stand to engage a die mounted in one end against a die support carried by the stand, a punch slidable in the pressure chamber to raise a pressure medium in the pressure chamber to extrusion pressure, and a billet holder slidable in the chamber for pressing the billet against the die during sliding movement of the pressure chamber to closing position.
  • annular canted spring is arranged in a groove in the face of the die support opposite the die so as to prevent contact therebetween during closing movement of the pressure chamber.
  • the present invention relates to a press for hot hydrostatic extrusion, preferably a press in which, during the closing of the pressure chamber, a billet and a die are held in the desired position by a billet holder pressing billet and die against a die support.
  • a billet is inserted in a pressure chamber formed by a cylinder, a die having an opening with the cross-section desired for the product extruded and a pressure generating punch which, when pushed into the cylinder, generates the high pressure required for the extrusion in a pressure medium surrounding the billet and thus exerting pressure on it from all sides.
  • the ratio between the cross-sectional surface of a billet and the cross-sectional surface of a product shaped in the die is called the area reduction ratio in hydrostatic extrusion.
  • the economy of the method is, namely, to a great extent dependent on the area reduction ratio since this limits the cross-section of the billet and thus the amount produced per working cycle.
  • the magnitude of the area reduction ratio is dependent on the material and the temperature. For copper the area reduction ratio at kb pressure is about 50 at room temperature and about 800 at 300C.
  • Hot extrusion thus offers a way of con siderably increasing production and decreasing costs for hydrostatic extrusion in cases where such material, equipment and dimensions for the product are used that the reduction ratio and the operating pressure of the press limit the size of the billet so that the volume of the pressure chamber is poorly exploited.
  • a billet holder When a heated billet and a heated die are inserted, a billet holder is preferably used which is movable in the high pressure cylinder and holds the billet and die in the correct position while the pressure chamber is being closed, by pressing the billet and the die against a die support with a suitable force.
  • a billet holder of this type is described in more detail in US. Pat. No. 3,531,965.
  • the die Upon contact between the hot die and a cold die support, the die is rapidly cooled as is also the point of a billet protruding into the inlet of the die.
  • the required pressure rises at the selected area reduction ratio. This may mean that the pressure required to start the extrusion process cannot be achieved and the extrusion cannot therefore be completed.
  • an annular canted spring is arranged in a groove in the face of the die support opposite the die so as to prevent contact therebetween during closing movement of the pressure chamber.
  • FIG. 1 shows schematically a press according to the invention
  • FIG. 2 shows on a larger scale the actual pressure chamber and certain neighboring parts
  • FIG. 3 shows the die, the support and the element used to separate the die and the support, in more detail.
  • FIG. 4 shows a method of designing the die support and separating element so that this element remains in the die support.
  • 1 designates a. press stand.
  • a horizontal high pressure cylinder 2 is axially movable.
  • the required operating cylinders are not shown.
  • an operating cylinder 3 having an operating piston 4 which is in the form of a differential piston and connected to a pressure generating punch 5 which projects into the high pressure cylinder 2 and generates the pressure required for the extrusion process in the pressure chamber 6.
  • the pressure generating punch is operated by supplying pressure medium from a pressure medium source, not shown, to one of the spaces 11 or 12 formed between the cylinder 3 and the piston 4.
  • the supply conduits are designated 13 and 14.
  • a billet holder 15 which is shaped as a piston freely movable in the cylinder run.
  • the billet holder is of the type described in the previously mentioned US. Pat. No. 3,531,965.
  • the billet holder 15 divides the'space 16 in the pressure chamber 6 into two separate spaces 16a and 16b.
  • the billet holder 15 is provided with a sealing ring 17 which seals against the hollow in the cylinder 2 and with an overflow valve 18 having a valve body 19 which seals against a valve seat 20 and is pressed against this seat by a spring 21, the tension of which can be adjusted with the help of an adjustment screw 22.
  • Between the space 16a and the valve 18 is a channel 23.
  • the end members 7 and 8 connected to the ends of the cylinder 2 by means of bolts or draw rods.
  • the seals 30 and 31 seal between the pressure generating punch and the end piece 7 and between the punch and the cylinder 2, respectively.
  • the seal 31 is a high pressure seal.
  • In the end member 7 is a channel 32 which opens out between the seals 30 and 31. BY means of a conduit and valve, not shown, the channel 32 can be placed in communication with one or more sources of pressure medium.
  • a seal 33 seals between the die support and the cylinder 2.
  • In the die support 10 is an annular groove 34 and in this groove is an annular spring 35 of the cup spring or annular canted type.
  • the material of this spring is of the same thickness or slightly less than the depth of the groove 34.
  • the spring will thus be completely pressed down into the groove when the die 9 is subjected to a considerable axial load and the die will rest against the inner surface of the die support.
  • the spring ring 35 must be held in some way in the groove 34 in the die support.
  • the outer side of the groove may be formed by a ring 37 with L cross-section.
  • One leg of the L is directed radially inwards so that between the projecting part 38 formed by the leg and the bottom of the groove 34 an annular groove is formed.
  • the ring 35 is shaped with an annular projection 36 which fits into said groove.
  • the part 38 prevents the ring 35 from falling out of the die support 10.
  • a heated billet which is to be pressed, and a die, are inserted between the end member 8 of the high pressure chamber 6 and the die support 10 by a manipulator. Only the gripping means 36 and 37 of the manipulator are shown.
  • the chamber 6 is displaced to the right until the end surface of the pressure generating punch 5 is between the seals 30 and 31 in the end member 7.
  • the space 16a is now supplied with pressure medium from a source of pressure medium, not shown, the pressure of which is not less than the opening pressure of the valve 18.
  • the billet holder will be displaced to the right under the influence of the pressure medium in the space 16a and presses the billet 27 and die 9 towards the die support 10 with a pressure depending on the pressure difference between the spaces 16a and 16b.
  • the billet is fixed by the pressure so that the manipulator can be removed and the pressure chamber completely closed by the simultaneous displacement of the pressure chamber and the pressure generating punch axially to the right in the position with regard to each other which is shown in FIG. 2.
  • the strength of the ring spring 35 is chosen so that at the holding pressure a gap is formed between the die 9 and the die support 10. An insulating layer of air will then exist between the heated die and the cold die support while the pressure chamber is being closed, thus preventing rapid cooling of the die.
  • the pressure of the pressure medium in the space 16a is increased considerably above the opening pressure of the valve 18 so that pressure medium flows into the space 16b and compresses any air in this space to such a small volume that this air only negligibly affects the movement of the pressure generating punch upon the subsequent in crease in pressuriinjhe pressure chamber to the extrusion pressure by t e insertion of the pressure generating punch 5 into the space 16a.
  • the force operating on the die 9 will press down the spring element 35 completely into the ringshaped groove 34. The die will thus rest directly against the die support.
  • a complete operating cycle for a press for hot extrusion, in which the spring element can be used is further described in the application for Method of Hydrostatic Extrusion referred to above.
  • Press for hydrostatic extrusion comprising a press stand, having a die support carried thereby, a high pressure cylinder displaceable axially in the press stand constituting a pressure chamber, a die slidable in between the cylinder and the die support, a pressuregenerating punch slidable in the cylinder to generate a pressure necessary for extrusion in a pressure medium enclosed in the pressure chamber and surrounding a billet to be extruded, and a billet holder axially displaceable in the cylinder to retain the billet and the die during a part of the closing movement of the pressure chamber by pressing the billet and the die towards the die support, spring means operatively engaged with the die and the die support to keep the die and die support separated from each other when the die and the billet are held during the closing movement of the pressure chamber until the pressure on the billet exceeds predetermined amount.
  • the spring means comprises an annular spring of the canted type.
  • one of the die supports has an annular groove therein facing the die, said die having a depth which is at least equal to the thickness of the spring material, the annular spring being positioned in said groove.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Press Drives And Press Lines (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
US145183A 1970-05-26 1971-05-20 Press for hot hydrostatic extrusion Expired - Lifetime US3698220A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE07171/70A SE340605B (de) 1970-05-26 1970-05-26

Publications (1)

Publication Number Publication Date
US3698220A true US3698220A (en) 1972-10-17

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US145183A Expired - Lifetime US3698220A (en) 1970-05-26 1971-05-20 Press for hot hydrostatic extrusion

Country Status (6)

Country Link
US (1) US3698220A (de)
CA (1) CA940874A (de)
DE (1) DE2124417C3 (de)
FR (1) FR2093774A5 (de)
GB (1) GB1341591A (de)
SE (1) SE340605B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3939682A (en) * 1972-09-19 1976-02-24 Kobe Steel Ltd. Method and machine for use in hydrostatic extrusion
US4023390A (en) * 1973-09-19 1977-05-17 Kobe Steel Ltd. Machine for use in hydrostatic extrusion
US4083214A (en) * 1974-11-07 1978-04-11 Kobe Steel, Ltd. Hydrostatic extrusion method
FR2486315A1 (fr) * 1980-07-03 1982-01-08 Crouzet Sa Dispositif de liaison electrique pour circuit imprime sur carte
WO2002026409A2 (en) * 2000-09-29 2002-04-04 Mlc Extrusion Systems Ltd. A method and a system for hot hydrostatic pressing

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE403348B (sv) * 1974-12-06 1978-08-14 Asea Ab Tetningsanordning vid press for hydrostatisk strengpressning av ror
SE403345B (sv) * 1974-12-06 1978-08-14 Asea Ab Tetningsanordning for hydrostatisk strengpress
SE403346B (sv) * 1974-12-06 1978-08-14 Asea Ab Tetningsanordning for hydrostatisk strengpress
SE403347B (sv) * 1974-12-06 1978-08-14 Asea Ab Press for hydrostatisk strengpressning
DE2739904C2 (de) * 1977-09-05 1986-11-20 SMS Hasenclever Maschinenfabrik GmbH, 4000 Düsseldorf Indirekt-Metallstrang- und Rohrpresse zum isothermen Pressen
WO1990011146A1 (en) * 1989-03-27 1990-10-04 Institut Fiziki Vysokikh Davleny Imeni L.F.Vereschagina Akademii Nauk Sssr Device for making elongated articles of small cross-section by means of hot gas extrusion

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3531965A (en) * 1967-10-06 1970-10-06 Asea Ab Press stand for hydrostatic extrusion of a billet
US3563075A (en) * 1968-01-05 1971-02-16 Inst Fiz Metallov Installation for hydrostatic extrusion of rods and tubular and profiled articles

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3531965A (en) * 1967-10-06 1970-10-06 Asea Ab Press stand for hydrostatic extrusion of a billet
US3563075A (en) * 1968-01-05 1971-02-16 Inst Fiz Metallov Installation for hydrostatic extrusion of rods and tubular and profiled articles

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3939682A (en) * 1972-09-19 1976-02-24 Kobe Steel Ltd. Method and machine for use in hydrostatic extrusion
US4023390A (en) * 1973-09-19 1977-05-17 Kobe Steel Ltd. Machine for use in hydrostatic extrusion
US4083214A (en) * 1974-11-07 1978-04-11 Kobe Steel, Ltd. Hydrostatic extrusion method
FR2486315A1 (fr) * 1980-07-03 1982-01-08 Crouzet Sa Dispositif de liaison electrique pour circuit imprime sur carte
WO2002026409A2 (en) * 2000-09-29 2002-04-04 Mlc Extrusion Systems Ltd. A method and a system for hot hydrostatic pressing
WO2002026409A3 (en) * 2000-09-29 2003-10-16 Mlc Extrusion Systems Ltd A method and a system for hot hydrostatic pressing
US20040035167A1 (en) * 2000-09-29 2004-02-26 Victor Lugovskoy Method and a system for hot hydrostatic pressing
US7250131B2 (en) 2000-09-29 2007-07-31 Mlc Extrusion Systems Ltd. Method and a system for hot hydrostatic pressing

Also Published As

Publication number Publication date
GB1341591A (en) 1973-12-25
DE2124417C3 (de) 1974-05-30
SE340605B (de) 1971-11-29
DE2124417A1 (de) 1971-12-02
CA940874A (en) 1974-01-29
DE2124417B2 (de) 1973-11-08
FR2093774A5 (de) 1972-01-28

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