US3747383A - Press for hydrostatic extrusion of long billets - Google Patents

Press for hydrostatic extrusion of long billets Download PDF

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Publication number
US3747383A
US3747383A US00230902A US3747383DA US3747383A US 3747383 A US3747383 A US 3747383A US 00230902 A US00230902 A US 00230902A US 3747383D A US3747383D A US 3747383DA US 3747383 A US3747383 A US 3747383A
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US
United States
Prior art keywords
pressure
chamber
press
piston
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
US00230902A
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English (en)
Inventor
E Westman
J Robertsfors
P Syvakari
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ABB Norden Holding AB
Original Assignee
ASEA AB
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 ASEA AB filed Critical ASEA AB
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Publication of US3747383A publication Critical patent/US3747383A/en
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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

  • ABSTRACT A press for the hydrostatic extrusion of long billets has a stand with a pressure generating chamber and a pressure generating plunger insertable in the pressure generating chamber to generate high pressure in a pressure medium contained therein.
  • a pressure chamber is arranged in line and communicates with the pressure generating chamber.
  • a stationary support table is provided to take up axial forces on a die, and is spaced from the opening of the pressure chamber so that a die can be inserted into alignment with the opening of the pressure chamber.
  • the support table contains a piston which is movable in the direction of the pressure chamber and on which the die support is carried for movement of the die into the opening of the pressure chamber opening.
  • the present invention relates to a press for hydrostatic extrusion of long billets.
  • a pressure-generating chamber may be used which has an inner diameter suitably chosen with respect to the strength of the walls of the pressure chamber and the buckling strength of the pressure-generating plunger, so that the greatest possible usuable volume is obtained under given circumstances such as available press stand and available driving power.
  • This pressure-generating chamber is connected to a separate extrusion chamber where the billet and the die are placed. If pressure above about 7 kbar are to be used, it is necessary to place the pressure chamber in line with the pressure-generating chamber so that a durable connection can be obtained between the chambers.
  • the length of the pressure chamber may be considerable. Lengths of 5 to 15 metres are possible. Presses of this type are particularly suitable for manufacturing sections with cross-sections which are difficult to roll, for example triangular crosssection.
  • a circular rod In order to fill the pressure chamber as well as possible, it is preferable to start with a circular rod. In order to increase the extrusion ratio, extrusion and drawing may be carried out simultaneously.
  • the press according to the invention has a pressuregencrating chamber and an extrusion chamber arranged in line with it. At the end of the extrustion chamber facing away from the pressure-generating chamber there is a press table which takes up the force operating on the die during the extrusion process.
  • the support table is preferably joined to the stand of the pressure-generating chamber by a number of connecting rods, but it may also be anchored in a base of sufficient stability. Between the support table and the pressure chamber is an opening which makes it possible to insert a die from the side to a position opposite the press chamber opening and then into the pressure chamber, after which a die support is inserted in the opening. This, either directly or through other elements transmits the force operating on the die to the support table.
  • the die support may comprise a support block which is inserted from the side between the pressure chamber and the support table and rests directly on the support table.
  • the die support may also be carried by one or more pistons or consist of a piston running in a cylinder in the support table.
  • the piston may be displaced towards the pressure chamber and locked in relation to the stationary support table or be influenced during the entire extrusion process by a pressure medium having such high pressure that the force of the piston with all certainty exceeds the force of the die operating in the opposite direction. In the latter case gaps can be eliminated between the various construction elements when the connecting rods are strained. In this way, reliable sealing elements can be used and the connecting rods need not be over-dimensioned to limit the displacement of the stationary support table due to the load.
  • a piston arranged in line with the pressure chamber must of course have a bore for the product being extruded and must therefore be in the form of a differential piston or ring piston.
  • FIG. 1 shows schematically a press according to the invention
  • FIG. 2 shows the support table with a die holder in the form of a differential piston
  • FIG. 3 the connection between the pressuregenerating chamber and the extrusion chamber
  • FIG. 4 the side of the pressure-generating chamber facing the operating cylinder of the press.
  • 1 designates a stand comprising two yokes 2 which are held together by a pre-stressed strip mantle 3.
  • an operating cylinder 4 having a differential piston 5 which carries a pressuregenerating plunger 6.
  • a pressure chamber 7 which is formed by a cylinder 8, plunger 6 and cylinder 9.
  • the plunger 6 is moved into the chamber 7 by supplying a pressure medium through a conduit 11 which is in communication with a pressure medium source, not shown.
  • the plunger 6 is returned by supplying pressure medium through the channel 13 to the chamber 12.
  • an extrusion chamber 14 which is formed by the tube 15, connection tube 16 and a die 17 which is inserted into the tube 15 during the extrusion process.
  • a support table 18 which takes up the force exerted on the die 17 during the extursion process.
  • the support table 18 is joined to the yoke 2 of the stand by a number of connecting rods 19.
  • An operating cylinder 20 (FIG. 2) is arranged in the support table 18, in which there is an axially movable piston 21 carrying a die support 39.
  • the piston 21 is shaped as a differential piston with a head part 21a and a tube 21b joined to the head part. Both parts are provided with bores 22, 23 and 24 to provide a passage through the piston for the extruded product.
  • the die support 39 is clamped against the piston part 21a by means of ring elements 25 and 26.
  • the piston 21a, 21b is moved towards the tube 15 by supplying pressure medium to the chamber 34 through a channel 35 which is in communication with a source of pressure medium, not shown, by means of conduits and valves, not shown.
  • the piston is returned with the help of operating cylinders, not shown.
  • the pressure chamber 14 (FIG. 3) communicates with the pressure-generating chamber 7 through holes 40 and 41 in the tube 16 and cylinder 9, respectively. Between the cylinders 9 and 8 is a seal 42. The gaps 43 and 44 between the cylinder 9 and the tube 16 and between the tube 16 and the tube 15, respectively, forming parts of the extrusion chamber 14, are bridged by expanding sealing rings 47 provided with O-rings 45 and 46.
  • the tube 15 which constitutes an element of the extrusion chamber 14 is generally arranged stationarily in the press.
  • a billet to be extruded is inserted in the chamber through the holes 22, 23, 24 in the die support 39 and the piston 21a, 21b, after which a die is placed opposite the opening of the tube 15 and the piston '21 is moved towards the tube 15 and pushes the die into the tube, keeping it in position during the extrusion process.
  • a billet holder may be used prior to the start of the extrusion process, of the type described in U.S. Pat. No. 3,531,965 or a spring inserted in the tube which rests against a support in the connecting tube 16. It is also possible to use two tubes 15 and insert a billet and a die in one of the tubes while this is outside the press and 1 the other tube is inside the press. The tube can thus be provided with a new billet while extrusion is in progress.
  • the lefthand part of the pressure-generating chamber may be designed as shown in FIG. 4.
  • the end piece 50 In the end piece is a seal 41 which seals between the end piece and the pressure-generating plunger.
  • a high pressure seal 52 Between the end piece 50 and the tube 8 is a high pressure seal 52 which seals between the tube 8 and the plunger 6 when the plunger 6 is pushed into the pressure chamber 7 and generates the pressure necessary for the extrusion process.
  • pressure chamber 7 is filled before the extrusion process with a pressure medium from a source, not shown, which is in communication with the channel 53 by a conduit and valves, not shown.
  • the channel 54 permits escape of air of the pressure chamber during filling. It is connected to a drainage conduit which may have a valve which is closed when the air has been pressed out of the pressure chamber and this chamber is therefore filled with a liquid pressure medium. The pressure can then be considerably increased even before the pressure-generating piston is inserted. Pressures of between 25 500 bar are feasible.
  • suitable hydraulic systems are shown for filling the pressure chamber in the manner indicated.
  • Press for hydrostatic extrusion of long billets comprising a press stand having spaced yokes, a first pres sure generating chamber and an operating cylinder with a pressure generating plunger to generate a high pressure in a pressure medium contained in the first pressure generating chamber, said first pressure generating chamber and said operating cylinder being arranged between said yokes in said press stand, a second pressure chamber communicating with the first pres sure generating chamber and arranged outside said press stand and in line with the first pressure generating chamber, a stationary die support connected to said press stand, said second pressure chamber being positioned between one yoke of said press stand and said stationary die support table, said table taking up axial forces exerted on the die, the second pressure chamber and the support table being spaced apart to provide an opening therebetween, and a die insertable into said opening.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Extrusion Of Metal (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
US00230902A 1971-03-12 1972-03-01 Press for hydrostatic extrusion of long billets Expired - Lifetime US3747383A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE03169/71A SE358565B (ru) 1971-03-12 1971-03-12

Publications (1)

Publication Number Publication Date
US3747383A true US3747383A (en) 1973-07-24

Family

ID=20261532

Family Applications (1)

Application Number Title Priority Date Filing Date
US00230902A Expired - Lifetime US3747383A (en) 1971-03-12 1972-03-01 Press for hydrostatic extrusion of long billets

Country Status (7)

Country Link
US (1) US3747383A (ru)
CA (1) CA955201A (ru)
FR (1) FR2128818B1 (ru)
GB (1) GB1373555A (ru)
IT (1) IT952952B (ru)
SE (1) SE358565B (ru)
SU (1) SU532321A3 (ru)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112453086A (zh) * 2020-09-30 2021-03-09 中北大学 多运动形式压扭组合加载挤压设备

Citations (5)

* 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
US3484806A (en) * 1968-03-06 1969-12-16 Atomic Energy Commission Hydrostatic extrusion apparatus
US3491565A (en) * 1966-08-17 1970-01-27 Barogenics Inc Equipment adapted for hydrostatic extrusion and other uses
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 (5)

* 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
US3491565A (en) * 1966-08-17 1970-01-27 Barogenics Inc Equipment adapted for hydrostatic extrusion and other uses
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
US3484806A (en) * 1968-03-06 1969-12-16 Atomic Energy Commission Hydrostatic extrusion apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112453086A (zh) * 2020-09-30 2021-03-09 中北大学 多运动形式压扭组合加载挤压设备

Also Published As

Publication number Publication date
FR2128818B1 (ru) 1977-12-23
FR2128818A1 (ru) 1972-10-20
DE2208861A1 (de) 1973-05-17
GB1373555A (en) 1974-11-13
SE358565B (ru) 1973-08-06
DE2208861B2 (de) 1977-03-10
CA955201A (en) 1974-09-24
IT952952B (it) 1973-07-30
SU532321A3 (ru) 1976-10-15

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