US3751957A - Press for hydrostatic extrusion of tubes - Google Patents

Press for hydrostatic extrusion of tubes Download PDF

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Publication number
US3751957A
US3751957A US00225073A US3751957DA US3751957A US 3751957 A US3751957 A US 3751957A US 00225073 A US00225073 A US 00225073A US 3751957D A US3751957D A US 3751957DA US 3751957 A US3751957 A US 3751957A
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US
United States
Prior art keywords
mandrel
die
press according
point
pressure
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
US00225073A
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English (en)
Inventor
J 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
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 US3751957A publication Critical patent/US3751957A/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

  • a press for hydrostatic extrusion of tubes has a pressure chamber containing a pressure generating fluid and a spacer element arranged in the cylinder with a mandrel axially fixed at its inner end by the spacer tube.
  • the mandrel has a point part cooperating with the die in the cylinder. This point part of the die has a smaller cross-section than the rear part of the die,
  • the present invention relates to a press for hydrostatic extrusion of tubes, having a pressure chamber containing a high pressure cylinder, a pressuregenerating punch insertable in this cylinder and a die arranged in the cylinder.
  • a spacer element In the pressure chamber is a spacer element, usually a tube, which at its inner end axially positions a mandrel which together with the die forms a gap, in which a tubular billet is shaped to a tube when it is subjected to high all-sided hydrostatic pressure in a liquid surrounding the billet.
  • the invention relates to a mandrel attachment in a press for hydrostatic extrusion of tubes, which eliminates the problems which have existed so far in getting the mandrel to hold at the attachment point.
  • a press for hydrostatic extrusion of tubes has a pressure chamber containing a pressure generating fluid and a spacer element arranged in the cylinder with a mandrel axially fixed at its inner end by the spacer tube.
  • the mandrel has a point part cooperating with the die in the cylinder.
  • This point part of the die has a smaller cross-section than the rear part of the die, which rear part is secured to a support from which it is separate.
  • the joint between the support and the inner end of the die is sealed.
  • the pressure exerted by the pressure fluid on the larger part of the mandrel in a direction away from the die is greater than the friction force between the billet being extruded and the point of the mandrel.
  • FIGS. 1 and 2 show previous ways of designing the attachment of a mandrel.
  • FIGS. 3 and 4 show the design and attachment according to the invention.
  • 1 designates a pressure chamber consisting of a high pressure cylinder 2, a piston 3 insertable in this chamber, and a die 4- inserted at the opposite end of the cylinder. Between the piston 3 and the cylinder 2 and between the die 4 and the cylinder 2 are seals 5 and 6, respectively. A spacer tube 8 resting against the die 4 is arranged in the pressure chamber space 7.
  • a mandrel 9 is mounted in an annular plate 10 which is supported against the spacer tube 8, so that mandrel is positioned axially in relation to the die.
  • the mandrel At its rear end the mandrel is provided with a conical attachment part 11 and the ring 10 is provided with a conical annular seat 12 to fit the attachment part.
  • a tubular billet 13 is inserted in the pressure chamber and shaped in the gap 14 between the mandrel and the die to form a tube 15, because of the action of a pressure medium in the pressure chamber space 7.
  • the spacer tube 8 are openin gs so that the space 7a between the mandrel 9, the plate 10, the spacer tube 8 and the die 4 is in permanent communication with the interior of the pressure chamber space 7.
  • mandrel l7 and plate 18 are made in one piece.
  • the pressure P is taken up by the plate 10 and transmitted by this plate to thespacer tube 8. It has been found that the mandrel is likely to rupture at or close to the attachment point even if the attachment point is extremely carefully dimensioned and shaped.
  • the mandrel usually ruptures at the conical part 11 a distance a above the edge 21 in the conical seat 12 of the ring 10. The rupture probably occurs because at this section an extremely high combined tension is obtained because of the unbalanced pressure, the contact pressure between the conical part 11 of the mandrel and the seat 12 and bending stresses in the conical part 11 due to the deformation of the ring 10 under the load P.
  • the embodiment according to FIG. 2 presents an even greater risk of rupture just at the transition between the mandrel l7 and the plate 18.
  • a mandrel 25 has a conical attachment part 26 at its inner end.
  • the plate 27 is solid and is provided with a machined guide 28 for the conical attachment part 26 of the mandrel.
  • a sealing ring 31, for example an O-ring or the like, is placed around the attachment part 26 and is pressed by means of an annular holder 29 against the part 26 and the guide 28. A seal is therefore obtained between the mandrel part 26 and the plate 27, so that pressure medium is prevented from penetrating into the space 30 between the mandrel and the plate 27.
  • the unbalanced pressure P a p p (1rd I/4) is taken up directly by the plate 27 and therefore does not affect the mandrel 25.
  • the tension in the mandrel attachment is therefore decreased.
  • the attachment must be able to take up the tensile force F which occurs because of friction between the billet l3 and the front part of the mandrel 25.
  • the pressure can be considerably reduced if the front part of the mandrel is made conical.
  • the pressure medium in the space 7a acts on the conical part 26 of the mandrel. An upwardly directed pressure P is thus obtained which balances the friction force F.
  • the diameter d should be chosen so great than F, 2 F.
  • the mandrel may be provided with a drainage channel 31 to drain the space 30 so that any oil which penetrates will not jeopardize the strength of the joint.
  • the transition between the larger and small cross-sections of the mandrel is close to the front end and is used in the invention to attach a mandrel point of wear-resistant material on a mandrel otherwise consisting of some other material.
  • a plate 40 resting against the support tube 8 has a cylindrical machined guide 41 with a triangular bevel 42.
  • a cylindrical mandrel part 43 is provided with an attachment ring 44.
  • the mandrel part 43 is pressed against the plate 40 by a ring 45 attached to the plate.
  • the triangular space between the bevel 42, the mandrel part 43 and the ring 44 is a sealing ring 46, for example an O-ring.
  • the mandrel is provided with a point 47.
  • the joint between the mandrel part 43 and the point 47 is bridged by a sleeve 48 having sealing rings 49 and 50 which seal between the sleeve 48 and the mandrel part 43 and between the sleeve 48 and the point 45, respectively.
  • the pressure component P forces the point 47 against the mandrel part 43 and this part against the plate 40.
  • the spaces 50 and 51 can be drained through the channels 52 and 53.
  • Press for hydrostatic extrusion of tubes having a pressure chamber containing a high-pressure cylinder, a pressure-generating punch insertable in the cylinder, a die arranged in the cylinder, a spacer element arranged in the cylinder and a mandrel axially fixed at its inner end by the spacer element, the mandrel having a point part cooperating with the die to form a gap in which a tubular billet is shaped to a tube when it is subjected to an all-sided hydrostatic pressure, the part of the mandrel projecting into the die having a smaller cross-section than the rear part, and a support member separate from the mandrel, the inner end of the mandrel abutting the support member, and means sealing such abutting inner end in a liquid-tight manner with respect to said support member.
  • said sealing means comprises an annular seal arranged to seal between the mandrel and the guide surface.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Insertion Pins And Rivets (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
US00225073A 1971-03-15 1972-02-10 Press for hydrostatic extrusion of tubes Expired - Lifetime US3751957A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE03277/71A SE364649B (ja) 1971-03-15 1971-03-15

Publications (1)

Publication Number Publication Date
US3751957A true US3751957A (en) 1973-08-14

Family

ID=20261763

Family Applications (1)

Application Number Title Priority Date Filing Date
US00225073A Expired - Lifetime US3751957A (en) 1971-03-15 1972-02-10 Press for hydrostatic extrusion of tubes

Country Status (9)

Country Link
US (1) US3751957A (ja)
JP (1) JPS5436144B1 (ja)
CA (1) CA961439A (ja)
CH (1) CH543316A (ja)
FR (1) FR2130264B1 (ja)
GB (1) GB1374031A (ja)
IT (1) IT952973B (ja)
NL (1) NL7203298A (ja)
SE (1) SE364649B (ja)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3789642A (en) * 1972-06-12 1974-02-05 Asea Ab Method for hydrostatic extrusion of tubes
US3866306A (en) * 1973-01-30 1975-02-18 Asea Ab Method of hydrostatically extruding compound material and compound billets
US3877272A (en) * 1973-03-07 1975-04-15 Asea Ab Method for hydrostatic extrusion of tubes and billets
US3893320A (en) * 1973-10-12 1975-07-08 Asea Ab Extrusion press for hydrostatic extrusion with a billet-holding piston in the pressure chamber
US3946584A (en) * 1973-04-11 1976-03-30 Kobe Steel, Ltd. Hydrostatic extrusion method and apparatus
US4031732A (en) * 1974-06-07 1977-06-28 Asea Method for hydrostatic extrusion of tubes
US4085606A (en) * 1976-12-09 1978-04-25 Westinghouse Electric Corporation Hydrostatic extrusion apparatus for producing hollow elongated bodies of rectangular cross section

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3789642A (en) * 1972-06-12 1974-02-05 Asea Ab Method for hydrostatic extrusion of tubes
US3866306A (en) * 1973-01-30 1975-02-18 Asea Ab Method of hydrostatically extruding compound material and compound billets
US3877272A (en) * 1973-03-07 1975-04-15 Asea Ab Method for hydrostatic extrusion of tubes and billets
US3946584A (en) * 1973-04-11 1976-03-30 Kobe Steel, Ltd. Hydrostatic extrusion method and apparatus
US3893320A (en) * 1973-10-12 1975-07-08 Asea Ab Extrusion press for hydrostatic extrusion with a billet-holding piston in the pressure chamber
US4031732A (en) * 1974-06-07 1977-06-28 Asea Method for hydrostatic extrusion of tubes
US4085606A (en) * 1976-12-09 1978-04-25 Westinghouse Electric Corporation Hydrostatic extrusion apparatus for producing hollow elongated bodies of rectangular cross section

Also Published As

Publication number Publication date
CA961439A (en) 1975-01-21
FR2130264B1 (ja) 1977-12-23
JPS5436144B1 (ja) 1979-11-07
DE2211650A1 (de) 1972-09-21
IT952973B (it) 1973-07-30
CH543316A (de) 1973-10-31
FR2130264A1 (ja) 1972-11-03
NL7203298A (ja) 1972-09-19
GB1374031A (en) 1974-11-13
DE2211650B2 (de) 1975-11-27
SE364649B (ja) 1974-03-04

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