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US3893320A - Extrusion press for hydrostatic extrusion with a billet-holding piston in the pressure chamber - Google Patents

Extrusion press for hydrostatic extrusion with a billet-holding piston in the pressure chamber Download PDF

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Publication number
US3893320A
US3893320A US511301A US51130174A US3893320A US 3893320 A US3893320 A US 3893320A US 511301 A US511301 A US 511301A US 51130174 A US51130174 A US 51130174A US 3893320 A US3893320 A US 3893320A
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US
United States
Prior art keywords
billet
mandrel
holder
pressure
pressure chamber
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
US511301A
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English (en)
Inventor
Pertti Syvakari
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
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
Application granted granted Critical
Publication of US3893320A publication Critical patent/US3893320A/en
Anticipated expiration legal-status Critical
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

  • ABSTRACT A press for the hydrostatic extrusion of tubes includes a billet holder through which passes a mandrel. There is an annular rib on the front face of the billet holder which is engageable with the back end of the billet. There are also passages opening from the rear of the billet holder into the spaces within and outside of the annular rib. Resiliently held valves with different spring pressures acting thereon control these passages.
  • a billet is inserted having an opening in its front end smaller than the diameter of the mandrel, and upon the application of pressure to a mandrel holder the mandrel is driven through the front end of the billet, enlarging the opening therein, while the pressure in the spaces referred to above prevents harmful tensile stresses in the die.
  • the present invention relates to a press for hydrostatic extrusion of the type having a billet holder shaped as a piston which divides the pressure chamber into two spaces and, which, when pressure medium is supplied to one of these spaces, achieves a difference in pressure between the two spaces when the axial movement of the piston is slowed down.
  • a tubular billet is the starting material and a mandrel for shaping the hole in the tube is used.
  • This mandrel is part of a unit in the pressure chamber, which is axially fixed by spacing tubes and sealing rings at the ends of the high-pressure chamber.
  • a hollow billet may be used which, at the front end, has a diameter which is less than the diameter of the mandrel. The mandrel is pressed into this front path in connection with the insertion of the billet, thus obtaining a seal.
  • the mandrel must then be axially fixed and the forces will be taken up by a spacing tube and a sealing ring.
  • the permissible axial force is limited and in many cases insufficient for pressing in the mandrel.
  • the invention makes it possible to press in the mandrel without subjecting said sealing ring to axial forces from the mandrel by way of said support tube, by making use of the pressure medium in a suitable manner and achieving suitable pressure differences between various spaces in the pressure chamber.
  • the billet holder is provided with elements which are intended to seal against the end of a billet inserted in the pressure chamber, thus separating a first space between the billet and the cylinder wall from a second space between the billet and the mandrel.
  • Extending axially through the billet holder are two separate flow paths.
  • a first flow path opens out into the space between the billet and the cylinder wall and a second flow path opens out into the space between the billet and the mandrel.
  • valve members which open the flow paths at different pressure differences between the spaces of the billet holder.
  • the mandrel is axially displaceably arranged and is pressed into the portion of the hollow billet having the smaller diameter by means of the pressure medium.
  • FIG. I shows a pressure chamber in a press for hydrostatic extrusion according to the invention and FIG. 2 in more detail the billet holder and the die and the pressure chamber parts around these.
  • I designates a pressure chamber formed from a high'pressure cylinder 2, a pressuregenerating punch 3 and a die 4 resting on a die support 5.
  • the cylinder 2 may be built up of an inner tube 6 (liner), which is surrounded by an outer prestressed tube 7, possibly a prestressed strip sheath, and end pieces 8 and 9. These end pieces act as support for high-pressure seats 10 and I1. Between these seals there are two spacing tubes 12 and 13, a holder I4 for a mandrel l5 and a spacing tube 16 which transmits axial forces, acting on the mandrel during the extrusion, to the die 4.
  • the mandrel I5 is provided with a head 17 which is able to move in the bore hole I8 between the seat I9 in the holder 14 and the lid 20.
  • the mandrel is shown in its left limit position before it has been pushed into the front part of the billet.
  • the mandrel is shown in its right limit position completely inserted into the billet. During extrusion it is located in this position.
  • In the mandrel holder 14 is a channel 2].
  • the billet holder 25 divides the pressure chamber into two spaces 26a, 26b and 27a, 27b.
  • the space between the pressure-generating punch 3 and the billet holder 25 is divided into two parts 26a and 26b by the mandrel holder 14:
  • the other space is divided into two parts, one part 27a between the billet 28 and the spacing tube 16, and another part 27b between the billet 28 and the mandrel F5.
  • the spaces 27a and 27b are separated from each other by the annnular rib 30 on the billet holder 25.
  • a first flow path is formed by the channel 31, the valve chamber 32 and the channel 33. This opens out into the space 27a.
  • a second flow path is formed by the channel 34, the valve chamber 35 and the channel 36.
  • valve chambers there are valve members 37 and 38, respectively, which are influenced by springs 39 and 40 with different strengths.
  • the billet holder In the billet holder is a bore hole 41 with a bushing, fitting on the mandrel [5, which is secured by a locking ring 43. When the dimension of the tube is to be changed, the mandrel 15 and said bushing 42 are changed.
  • a seal 45 sealing between the opening in the end piece and the pressure-generating punch 3, and a channel 46 through which the space 26a can be supplied with pressure medium when the pressure-generating punch has the position shown in the figure.
  • the seal 10 and the seal II which is not shown here, are of the types having an outer sealing ring 50 and an inner sealing ring 5].
  • the ring 50 in the seal 11 transmits axial forces on the mandrel l5 acting to the left if the mandrel is completely axially fixed so that it is forced into the billet when the billet and the die are moved into the pressure chamber. This ring should not be subjected to great forces.
  • the billet holder 25 may consist of a disc 53 having a bore hole 41 for the bushing 42 for the mandrel l and a number of bore holes 54 and 55 for a number of valve units consisting of valve housings 56 and 57, respectively, with valve cones 58 and 59, respectively, which are influenced by springs 60 and 61, respectively, of different strengths.
  • the channels 3 1 and 34, respectively, are then situated in the valve housings and the channels 33 and 36, respectively, are positioned in the disc 53. in the valve housings there are radial openings 63 and 64, respectively.
  • the mode of operation of the press is as follows. When a billet and a die are inserted, they are placed straight in front of the cylinder, whereupon the cylinder is pushed to the right, a little bit over the billet. At the same time pressure medium is supplied to the spaces 26a and 26b through channel 46 in the end piece 9.
  • the valves in the billet holder 25 achieve a pressure difference between the two sides of the billet holder so that a force is obtained which displaces the holder 25 towards the billet 28 and presses the billet against the die 4 and the die support 5.
  • the billet and the die are retained in this position by the force of the billet holder.
  • the inserting appliance can be removed and the cylinder 2 be moved in over the billet to the position shown in the figures.
  • the hole 66 at the billet point 65 has a smaller diameter than the mandrel 15.
  • the billet point 65 engages the mandrel 15, it moves the mandrel to-the left, as shown in the lower halves of the figures.
  • an axial force of such magnitude can be obtained that the mandrel is pressed into the front part 65 of the billet to the position shown in the upper halves of the figures.
  • This pressure required for inserting the mandrel is much higher than the pressure required for holding the billet and the mandrel together.
  • valve members 37 and 58 which open at a relatively low pressure, in the first flow path opening out in the space 270, the space 27d, can be filled with pressure medium before the pressure in the spaces 26a and 26b is raised to the level required for inserting the mandrel 15.
  • the valve members 38 and 59 respectively, in the other flow path, opening out into the space 27h, are opened so that this space also is filled with pressure medium and extrusion takes place.
  • Press for hydrostatic extrusion of tubes comprising a press stand, a pressure chamber comprising a highpressure cylinder displaceably arranged in the press stand, a die support, a die held by such holder sealing one opening of the cylinder, said die having an opening for forming a profile, and a punch insertable in the other opening of the cylinder for generating a pressure within a pressure medium enclosed in the pressure chamber and surrounding a billet for extrusion of the billet, a mandrel in the pressure chamber, a billet holder shaped like a piston dividing the pressure chamber into two spaces and having an opening for the mandrel, said piston holding the billet and the die pressed against the die support while the pressure chamber is closed, the billet holder having means thereon sealingly engageable against a billet in the pressure chamber, thereby separating a first space between the billet and the cylinder wall from a second space between the billet and the mandrel, a first and a second flow path through the billet holder opening out into the first and the second spaces, respectively,
  • the separating means comprises an annular rib on the end surface of the billet holder facing a billet and sealingly engageable against the end surface of the billet.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Forging (AREA)
US511301A 1973-10-12 1974-09-30 Extrusion press for hydrostatic extrusion with a billet-holding piston in the pressure chamber Expired - Lifetime US3893320A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7313874A SE386383B (sv) 1973-10-12 1973-10-12 Rorpress for hydrostatisk strengpressning med emneshallande kolv i tryckkammare

Publications (1)

Publication Number Publication Date
US3893320A true US3893320A (en) 1975-07-08

Family

ID=20318791

Family Applications (1)

Application Number Title Priority Date Filing Date
US511301A Expired - Lifetime US3893320A (en) 1973-10-12 1974-09-30 Extrusion press for hydrostatic extrusion with a billet-holding piston in the pressure chamber

Country Status (7)

Country Link
US (1) US3893320A (ru)
JP (1) JPS5066465A (ru)
DE (1) DE2446405C3 (ru)
FR (1) FR2247296B1 (ru)
GB (1) GB1481878A (ru)
SE (1) SE386383B (ru)
SU (1) SU568339A3 (ru)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE409003B (sv) * 1977-11-22 1979-07-23 Asea Ab Press for hydrostatisk pressning av ror
US6884012B2 (en) * 2003-09-04 2005-04-26 Illinois Tool Works Inc. Heavy duty toggle bolt fastener assembly, and method of installing and removing the same

Citations (4)

* 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
US3702555A (en) * 1971-02-25 1972-11-14 Asea Ab Press for hot hydrostatic extrusion
US3751957A (en) * 1971-03-15 1973-08-14 Asea Ab Press for hydrostatic extrusion of tubes
US3751958A (en) * 1971-05-20 1973-08-14 Asea Ab Press for hydrostatic extrusion of tubes

Patent Citations (4)

* 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
US3702555A (en) * 1971-02-25 1972-11-14 Asea Ab Press for hot hydrostatic extrusion
US3751957A (en) * 1971-03-15 1973-08-14 Asea Ab Press for hydrostatic extrusion of tubes
US3751958A (en) * 1971-05-20 1973-08-14 Asea Ab Press for hydrostatic extrusion of tubes

Also Published As

Publication number Publication date
DE2446405C3 (de) 1980-07-31
SE7313874L (ru) 1975-04-14
DE2446405B2 (de) 1979-11-15
FR2247296B1 (ru) 1978-06-09
SU568339A3 (ru) 1977-08-05
GB1481878A (en) 1977-08-03
JPS5066465A (ru) 1975-06-04
DE2446405A1 (de) 1975-04-17
SE386383B (sv) 1976-08-09
FR2247296A1 (ru) 1975-05-09

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