US3841128A - Press for hydrostatic extrusion of tubes - Google Patents

Press for hydrostatic extrusion of tubes Download PDF

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Publication number
US3841128A
US3841128A US00367106A US36710673A US3841128A US 3841128 A US3841128 A US 3841128A US 00367106 A US00367106 A US 00367106A US 36710673 A US36710673 A US 36710673A US 3841128 A US3841128 A US 3841128A
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US
United States
Prior art keywords
pressure
cylinder
mandrel
press
extrusion
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
US00367106A
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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 US3841128A publication Critical patent/US3841128A/en
Priority to US05/644,901 priority Critical patent/USRE29205E/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
    • B21C23/21—Presses specially adapted for extruding metal
    • B21C23/217—Tube extrusion presses
    • 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 includes a high pressure cylinder axially displaceable in a press [30] Foreign Application Priority Data stand with a die insertable into the cylinder and a June 12, 1972 Sweden 7688 72 Pressure gehfiratiflg Punch insertable into the Cylinder to generate the pressure for extrusion.
  • a mandrel is 52 US. c1. 72/60, 72/265 Carried by a rod which Passes through the pressure 511 Int. Cl.
  • B21c 25/04 generating Punch Seals are provided between the [58] Field of Search 72/60, 264, 265 mandrel and the Pressure generating punch and tween the pressure generating punch and the pressure 5 References Cited cylinder. These seals are so located that during the ac- UNTED STATES PATENTS tual extrusion they are arranged in the same transverse l 3,451,241 6/1969 Fuchs, Jr. 72/60 p ane 3,722,245 3/1973 Yamamoto et al. 72/60 3 Claims, 5 Drawing Figures PAmmunm 1 5mm 3.841.128 SHEET 10F 2 Fig.
  • the present invention relates to a press exchangers and extrusion of tubes. 2
  • tubular pressuregenerating punches For pure hydrostatic extrusion, that is, extrusion without any axial force apart from the liquid pressure operating directly on the billet, tubular pressuregenerating punches have not been successful so far. Internal overpressure causes the punch to snap while external over-pressure causes it to be compressed.
  • the press characterised in that apparatus includes a rod passing through the pressure-generating punch forming a mandrel or constituting a holder for a mandrel.
  • the rod is normally directly connected to a piston in a separate operating cylinder for axial operation of the rod during insertion of a billet.
  • seals Between the rod and the hollow in the pressure-generating punch and between the pressuregenerating punch and the high-pressure cylinder are seals which are located in approximately the same radial plane at the time whenYextrusion is taking place. The seals are generally located during the actual extrusion in a radial plane close to the end of the highpressure cylinder and thus are stationary with respect to the cylinder.
  • FIG. 1 shows the insertion of a billet opposite the die and the pressurechamber cylinder
  • FIG. 2 the closing of the pressure chamber
  • FIG. 3 a recently closed pressure chamber
  • FIG. 4 the process just before extrusion is discontinued
  • FIG. 5 the opened pressure chamber after extrusion is complete.
  • FIG. 1 designates a horizontal press stand consisting of two yokes 2 and 3 connected tov each other by a number of rods 4.
  • a high-pressure cylinder 5 is axially movable in the press stand and can be displaced by means of a number of operating cylinders, not shown.
  • the operating cylinder is constructed of two concentric tubular parts 6a and 6b which form an annular space 7.
  • In the operating cylinder is an annular piston 8.
  • Pressure medium is supplied to the space 7 through a channel 9. The pressuremedium source is not shown. Return cylinders to move the piston 8 to the left of the position shown in FIGS.
  • the piston 8 is connected to a tubular pressure-generating punch- 10.
  • a rod 14 passes through the hole 11 in the yoke 3 and the hole 12 in the part 6b and the hole 13 in the punch 10, the front part of said rod forming a mandrel 14a and the part 14b forming a holder for the mandrel 14a.
  • the mandrel holder 14b is connected to apiston 15 slidable in a cylinder 16 attached-to the yoke 3.
  • the spaces 17 and 18 on each side of the piston 15 arein communication with pressure-medium sources, not shown, through channels- 19 and 20 provided with valves.
  • a die 21 Near the yoke 2 is a die 21.
  • the yoke 2 constitutes the die sup port during an extrusion process.
  • a billet is designated at 22.
  • Seals'2S and 26 are provided in the high-pressure cylinder to seal'between thecylinder 5 and the pres sure-generating punch 10 and between the cylinder 5 and the die 21.
  • the piston 8 is provided with seals 27 and 28 to seal between itself and the cylinder sections 6a and 6b.
  • the piston .15 is provided with seals 29 and 30 which seal betweenthe piston and the cylinder 16.
  • In the opening 11in the yoke 3 is a'seal 31 which seals between the yoke and the rod 14b.
  • the mandrel 14a is provided with a seal 32 which seals between the mandrel and the pressure-generating punch 10.
  • the billet 22 is provided at the front with a cone 33 which fits the inlet cone 34 of the die.
  • the hole 35 in the billet 22 has a smaller diameter at the point 36 of the billet than the diameter of the mandrel 14a.
  • the parts of the press are in the positionsshown in FIG. 1.
  • a billet 22'and a die 21 areapplied between the yoke 2 and the cylinder 5 sothatftheir center'line's coincide with that of the high-pressure cylinder.
  • the billet and the die arethere fore'placed opposite the hole 13 in the high-pressure cylinder 5.
  • the space 17 in the operating cylinder 16 is supplied withpressure medium so that the'piston 15 will displace the holder 14band the mandrel 14a to the right.
  • the force with which the mandres presses the billet against the die 21 and thus against the yoke 3 is primarily determined by the grip between the billet and the mandrel at the point 36 of the'billet. If the grip is suitably selected, the billet can be kept in the position shown in FIG. 2 and the manipulating devices removed. The cylinder S can then be pushed in over the billet and the die to the position shown in FIG. 3. The pressure chamber 40 is now completely closed and the billet abuts the mandrel 14a and the die 21. The pressure chamber 40 is filled with oil. In this position the seals 25 and 32 are in the same plane.
  • the space 7 in the cylinder 6 is now supplied with pressure medium so that the piston 8 is displaced to the right and the pressure-generating punch 10 is pressed into the pressure chamber 40, thus increasing the pressure therein.
  • the extrusion starts.
  • a tube 41 is formed in the gap between the mandrel and the opening 42 in the die.
  • the piston 8 and punch 10 are returned to the left to their initial positions.
  • the mandrel 14a is returned a little way to the left as shown in FIG. 5, after which the tube 42 is cut and the remnants 43 of the billet and the die 21 are removed.
  • the mandrel is drawn to the left to the position shown in FIG. 1,-the billet remnants 43 are pressed against the end surface of the pressure-generating punch 10, the mandrel 14a is removed from the billet remnants and an operating cycle is completed and the next can be started.
  • Press for hydrostatic extrusion of tubes comprising a press stand, a pressure chamber constituted by a high-pressure cylinder axially displaceable in the press stand, a die insertable into the cylinder and a pressuregenerating punch insertable into the cylinder to generate the pressure necessary for the extrusion process in a pressure medium enclosed in the pressure chamber, said pressure medium surrounding a billet to be extruded, a mandrel part which shapes the hole through the tube, which includes a rod part passing slidably through the pressure-generating punch, said mandrel part being supported by said rod part, a first seal sealing between the high pressure cylinder and the pressure generating punch and a second seal sealing between the pressure generating punch and the mandrel, said sec ond seal being axially stationary in relation to the first seal during the extrusion period of an operating cycle and approximately in the same radial plane as said first seal.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
  • Forging (AREA)
US00367106A 1972-06-12 1973-06-05 Press for hydrostatic extrusion of tubes Expired - Lifetime US3841128A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US05/644,901 USRE29205E (en) 1972-06-12 1975-12-29 Press for hydrostatic extrusion of tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7207688A SE379944B (ja) 1972-06-12 1972-06-12

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US05/644,901 Reissue USRE29205E (en) 1972-06-12 1975-12-29 Press for hydrostatic extrusion of tubes

Publications (1)

Publication Number Publication Date
US3841128A true US3841128A (en) 1974-10-15

Family

ID=20272043

Family Applications (1)

Application Number Title Priority Date Filing Date
US00367106A Expired - Lifetime US3841128A (en) 1972-06-12 1973-06-05 Press for hydrostatic extrusion of tubes

Country Status (6)

Country Link
US (1) US3841128A (ja)
JP (1) JPS4955559A (ja)
DE (1) DE2327518A1 (ja)
FR (1) FR2187436B1 (ja)
GB (1) GB1428443A (ja)
SE (1) SE379944B (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4031732A (en) * 1974-06-07 1977-06-28 Asea Method for hydrostatic extrusion of tubes
US10413951B2 (en) * 2015-09-14 2019-09-17 Seyed Sajjad Jamali Hydrostatic extrusion system and method for producing high strength seamless pipes
US10981205B2 (en) 2017-05-24 2021-04-20 Ghader Faraji Apparatus and method for fabricating high strength long nanostructured tubes

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3451241A (en) * 1966-09-01 1969-06-24 Western Electric Co Methods of hydrostatic extrusion
GB1234784A (en) * 1967-10-13 1971-06-09 Atomic Energy Authority Uk Improvements in or relating to the hydrostatic extrusion of tubes
US3722245A (en) * 1971-05-18 1973-03-27 Kobe Steel Ltd Hydrostatically operated extruding machine
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
US3451241A (en) * 1966-09-01 1969-06-24 Western Electric Co Methods of hydrostatic extrusion
GB1234784A (en) * 1967-10-13 1971-06-09 Atomic Energy Authority Uk Improvements in or relating to the hydrostatic extrusion of tubes
US3722245A (en) * 1971-05-18 1973-03-27 Kobe Steel Ltd Hydrostatically operated extruding machine
US3751958A (en) * 1971-05-20 1973-08-14 Asea Ab Press for hydrostatic extrusion of tubes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4031732A (en) * 1974-06-07 1977-06-28 Asea Method for hydrostatic extrusion of tubes
US10413951B2 (en) * 2015-09-14 2019-09-17 Seyed Sajjad Jamali Hydrostatic extrusion system and method for producing high strength seamless pipes
US10981205B2 (en) 2017-05-24 2021-04-20 Ghader Faraji Apparatus and method for fabricating high strength long nanostructured tubes

Also Published As

Publication number Publication date
GB1428443A (en) 1976-03-17
SE379944B (ja) 1975-10-27
FR2187436B1 (ja) 1979-01-26
JPS4955559A (ja) 1974-05-29
FR2187436A1 (ja) 1974-01-18
DE2327518A1 (de) 1974-01-03

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