US3851511A - Method for hydrostatic extrusion - Google Patents

Method for hydrostatic extrusion Download PDF

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Publication number
US3851511A
US3851511A US00397303A US39730373A US3851511A US 3851511 A US3851511 A US 3851511A US 00397303 A US00397303 A US 00397303A US 39730373 A US39730373 A US 39730373A US 3851511 A US3851511 A US 3851511A
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United States
Prior art keywords
billet
pressure
extrusion
pressure medium
cavity
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Expired - Lifetime
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US00397303A
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English (en)
Inventor
B Aberg
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ABB Norden Holding AB
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ASEA AB
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Filing date
Publication date
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Publication of US3851511A publication Critical patent/US3851511A/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, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS 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 billet for hydrostatic extrusion if provided near its rear end with holes therein which are left open so as to be filled by the fluid extrusion medium or are filled with a material of less resistance to deformation than the material of the billet.
  • the billet is extruded through a conical die. When the portion of the billet containing the holes enters the die, the pressure in the pressure medium drops and in response to such drop in pressure the supply of pressure medium is stopped. The extruded portion is broken off from the unextruded part and the material in the holes escapes and this causes a noise which may also be used to indicate that extrusion should be stopped.
  • the invention relates to hydrostatic extrusion.
  • the present invention relates to a method for hydrostatic extrusion, in which a billet is enclosed in a pressure chamber in an extrusion press.
  • the pressure chamber is filled with a pressure medium and the pressure in the pressure medium which surrounds the billet is then raised to such a level that the billet, under the influence of the pressure medium, is pressed out through an opening in a die which gives a product of the desired cross-section.
  • the invention also relates to a method of cutting off a pressed profile.
  • the billet is provided at its rear part with a cavity means by which is filled with pressure medium or another substance of less resistance to deformation than the material of the billet and which is separated from the pressure chamber at the end of the extrusion.
  • a cavity means by which is filled with pressure medium or another substance of less resistance to deformation than the material of the billet and which is separated from the pressure chamber at the end of the extrusion.
  • a change of pressure is measured indirectly for a transducer which senses the pressure in the operating cylinder for the pressure-generating punch.
  • a second effect is that the pressure medium expands when the cavity passes through the die opening and gives rise to a bang which may be detected and used as a control signal for interrupting the extrusion.
  • a third effect is that the pressure medium bursts the pressed product when it a has passed the die opening. When the cavity is of a suitable shape and size, the pressed product can be completely broken off.
  • the cavity may be shaped in many ways. It may consist of one or more preferably radially drilled holes which may either be drilled so that they are separated from each other or pass completely through the billet and communicate with each other at the point of crossing in the centre of the billet.
  • the invention can also be applied tothe extrusion of tubes. In this case a tubular billet is the starting material.
  • FIG. 1 shows schematically a pressure chamber with an inserted billet
  • FIGS. 2 to 5 show alternative embodiments of the rear end of the billet
  • FIGS. 6 to 10 illustrate what happens when extruding a billet having bores according to FIG. 1;
  • FIGS. 11 to 15 illustrate what happens when extruding a tubular billet having radial holes drilled through the wall of the tube and;
  • FIG. 16 shows a time-pressure curve for the pressure chamber or the operating cylinder for the pressuregenerating punch.
  • l designates a part of a stand in an extrusion press, the rest of which is not shown.
  • a high pressure cylinder 2 which forms a closed pressure chamber 5 together with a die 3 projecting into the cylinder 2 and a pressure-generating punch 4.
  • a billet is inserted into the pressure chamber 5.
  • the pressure chamber 5 is filled with a pressure-medium, normally castor oil.
  • the forward, pointed part 9 of the billet 8 seals against the conical inlet opening 10 of the die 3.
  • the billet 8 is provided at its rear part with a number of drilled holes 11 which do not communicate with each other.
  • FIGS. 2 and 3 show an embodiment in which an annular slot 21 forms the cavity which is filled with pressure medium.
  • FIGS. 6 to 10 show the extrusion of the last part of a billet 8 having a number of radial holes 11.
  • a bar 14 has been shaped in the die opening 13.
  • the holes communicate with the surrounding space in the pressure chamber 5, as shown in FIG. 6.
  • the drilled holes are separated from the pressure chamber by the wall in the inlet cone.
  • the depth of the holes 11 is reduced.
  • the constant volume of the enclosed pressure medium expands the hole in a manner shown in FIGS. 8 and 9.
  • the pressure medium enclosed in the holes flows out and is able to tear off the bar 14 when the holes 11 are suitably dimensioned. In this way a cone of the pressed profile can be obtained.
  • FIGS. 11 to 15 shows the last part of the extrusion of a hollow billet 16, in which a tube 17 is formed in the gap between the opening 13 in the die 3 and a mandrel 18.
  • a tube 17 is formed in the gap between the opening 13 in the die 3 and a mandrel 18.
  • FIGS. 11 to 15 correspond essentially to FIGS. 6 to 10. A detailed description is therefore not necessary.
  • the holes drilled into the billet can also be filled with a solid material which gives less resistance to deformation than the material of the billet.
  • Plastic plugs for example, can be inserted into the holes 11 and 19, respectively.
  • Method for hydrostatic extrusion which comprises enclosing a solid billet in a pressure chamber in an extrusion press, surrounding the billet by a pressure medium, raising the pressure in the pressure medium to such a level that the material in the billet, under the influence of the pressure medium, is pressed out through an opening in a die which gives a product of the desired cross-section, in which the billet at its rear part is provided with cavity means opening in the side wall of the billet which communicates directly with the pressure medium during the greater part of the extrusion and which is filled during the extrusion with a material having less resistance to deformation than the material of the billet.
  • the cavity means comprises at least one hole extending from the side surface of the billet into the interior thereof.
  • Method according to claim 1, which comprises interrupting the supply of pressure to the pressure chamber in response to the exit of the cavity means from the die.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
US00397303A 1972-09-14 1973-09-14 Method for hydrostatic extrusion Expired - Lifetime US3851511A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7211872A SE383269B (sv) 1972-09-14 1972-09-14 Forfarande vid hydrostatisk strengpressning

Publications (1)

Publication Number Publication Date
US3851511A true US3851511A (en) 1974-12-03

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ID=20294758

Family Applications (1)

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US00397303A Expired - Lifetime US3851511A (en) 1972-09-14 1973-09-14 Method for hydrostatic extrusion

Country Status (4)

Country Link
US (1) US3851511A (enrdf_load_stackoverflow)
JP (1) JPS4967862A (enrdf_load_stackoverflow)
GB (1) GB1434848A (enrdf_load_stackoverflow)
SE (1) SE383269B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5916616A (en) * 1995-08-11 1999-06-29 Nakano Vinegar Co., Ltd. Process for producing starch noodles by extrusion
US20160052035A1 (en) * 2015-11-04 2016-02-25 Vahid Shatermashhadi System and method for hydrostatic backward extrusion

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3344507A (en) * 1962-12-19 1967-10-03 Atomic Energy Authority Uk Hydrostatic extrusion of sheathed ceramic nuclear fuel material
US3592032A (en) * 1968-07-02 1971-07-13 Asea Ab Control means for hydrostatic extrusion
US3620059A (en) * 1968-03-15 1971-11-16 Asea Ab Hydrostatic extrusion of compound material
US3751955A (en) * 1971-03-30 1973-08-14 Asea Ab Method of preventing complete extrusion of a billet during hydrostatic extrusion

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3344507A (en) * 1962-12-19 1967-10-03 Atomic Energy Authority Uk Hydrostatic extrusion of sheathed ceramic nuclear fuel material
US3620059A (en) * 1968-03-15 1971-11-16 Asea Ab Hydrostatic extrusion of compound material
US3592032A (en) * 1968-07-02 1971-07-13 Asea Ab Control means for hydrostatic extrusion
US3751955A (en) * 1971-03-30 1973-08-14 Asea Ab Method of preventing complete extrusion of a billet during hydrostatic extrusion

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5916616A (en) * 1995-08-11 1999-06-29 Nakano Vinegar Co., Ltd. Process for producing starch noodles by extrusion
US20160052035A1 (en) * 2015-11-04 2016-02-25 Vahid Shatermashhadi System and method for hydrostatic backward extrusion
US9700925B2 (en) * 2015-11-04 2017-07-11 Vahid Shatermashhadi System and method for hydrostatic backward extrusion

Also Published As

Publication number Publication date
GB1434848A (en) 1976-05-05
SE383269B (sv) 1976-03-08
JPS4967862A (enrdf_load_stackoverflow) 1974-07-01

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