US3777539A - Forging press - Google Patents

Forging press Download PDF

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Publication number
US3777539A
US3777539A US00200957A US3777539DA US3777539A US 3777539 A US3777539 A US 3777539A US 00200957 A US00200957 A US 00200957A US 3777539D A US3777539D A US 3777539DA US 3777539 A US3777539 A US 3777539A
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United States
Prior art keywords
press
piston
cylinder
cross
piston rod
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
US00200957A
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English (en)
Inventor
F Priebe
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.)
Schloemann AG
Original Assignee
Schloemann AG
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 Schloemann AG filed Critical Schloemann AG
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Publication of US3777539A publication Critical patent/US3777539A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/10—Drives for forging presses
    • B21J9/12—Drives for forging presses operated by hydraulic or liquid pressure

Definitions

  • ABSTRACT 72/453 In order to shorten the height of a. hydraulic Press and [58] Fie'ld R to provide a reliable two-point guide, there is a fixed cross-head and the cylinder of a press ram is fixed to [56] References Cited the cross-head; the press piston carrIesthe forgIng tool and retract1on means such as a cross-pIece and retrac- UNITED STATES PATENTS tion rams act on the press piston rod to retract the 3,010,432 11/1961 Robra I 100/269 R press piston. 2,169,113 8/1939 Sheppard...
  • the present invention relates to a pressure fluid actuated (normally hydraulically actuated), preferably single-cylinder, forging press, in which a moving part of a press ram (piston and cylinder arrangement) fixed to a cross-head of a press carries a forging tool (e.g.
  • the press has main columns which are used as guides for a moving main cross-head which is fixed to the piston in order to guide the piston.
  • the present invention particularly relates to a forging press of a type which has no moving main cross-head fixed to the moving part of the press ram, for guiding the moving part of the press ram.
  • the main columns of the press frame are not used as guides, in order to avoid bending stresses in the columns when there is an eccentric forging load, and the wear and tear which would occur on the columns if they were used as guide members.
  • the moving masses are also relatively small.
  • the moving part of the press ram can be guided on two guides (i.e. at two guide locations) spaced apart in the axial direction of the press.
  • the press can be of column or frame construction, and such presses normally have a platen arranged to carry a second forging tool for cooperating with the first forging tool.
  • the presscylinder in the press ram is designed to move up and down together with a moving cross-head which guides the press cylinder.
  • a retraction cross-piece connected to the cylinder is, when the die is retracted, locatedat a distance from the cross-head which isequal to the stroke of the press.
  • the fixed piston of the piston and cylinder arrangement projects out of the cylinder and is attached to a fixed cross-head by means of tie rods which extend through the retraction cross-piece.
  • the press cylinder carrying the die is guided at two guide locations, one on the moving cross-head and the other on the piston; during a stroke of the press, the two guide locations move closer to each other so that ultimately there is no stable and accurate two location (two-point) guide for the die.
  • Securing the fixed piston by means of tie rods is not only costly but also increases the height of the press.
  • the present invention provides a pressure fluid actuated press having a fixed cross-head
  • a press ram having a press cylinder, a press piston and a piston rod connected to the press piston, the press cylinder being fixed to the fixed cross-head and the press piston being arranged for carrying a forging tool, and
  • retraction means for acting on the press piston rod to retract the press piston.
  • the retraction means preferably include a crosspiece cooperating with the press piston rod and pressure fluid means for retracting the crosspiece.
  • the press can have aplaten arranged to carrya second forging tool for cooperating with the first forging tool and tensile members connecting the platen to the fixed cross-head.
  • the piston/piston rod unit is stepped and is subjected to fluid pressure on the annular face between the piston and the piston rod.
  • This piston/piston rod unit constitutes the guide shaft and tool carrier and is the mainmovable weight of the press.
  • Two guides bushings may advantageously be inserted in the press cylinder to constitute the only guide members.
  • the press of the invention need have no tie rods and its maximum height can be: determined by the retracted retraction cross-piece. Thus, the height of the press can be less than in the conventional press referred to above, its construction can be less expensive and it can have a reliable two-point guide for the moving press piston.
  • FIG. 1 is a hydraulic push-down forging press in accordance with the invention, shown in longitudinal section;
  • FIG. 2 is a hydraulic push-up forging press in accordance with the invention, shown in longitudinal section.
  • FIGS. .1 and 2 have a rigid frame which is composed of a cylinder cross-head l, a base platen 2, columns 3 and nuts 4.
  • a stepped guide or press piston 7 has a piston rod 8 and an annular working face to which hydraulic fluid is supplied through a bore 9 in the press cylinder 5.
  • the cylinder 5,- piston 7 and piston rod 8 constitute a press ram.
  • a retraction crosspiece 14 Connected to the piston rod 8 is a retraction crosspiece 14 with which there engage retraction pistons 15 which move in retraction cylinders 16, with the cylin ders 16 being in their turn mounted in the fixed cylinder cross-head 1.
  • Packings 19, 20 seal the press cylinder 5 in relation tothe pressurized fluid.
  • the press with the push-down drive shown in FIG. 1 may be equipped with a sliding table 21 which carries the bottom die holder 13. The press rests on column bases 22 below the platen 2.
  • the press with the push'up drive shown in FIG. 2 cannot be equipped with a sliding table for the die holder 13-.
  • Deflector members 23 on the bottom die here prevent scale falling through the opening in the floor (through which the die holder 13 projects).
  • the push-up press rests on blocks 24 fixed to the cylinder cross-head l.
  • the forging operation is, in this case, effected in an upwards direction.
  • a forging S is positioned against the upper die by a crane or manipulator. It will be seen that in the presses of FIGS. 1' and 2, there is no moving cross-head to which the piston 7 is fixed for guiding the piston 7.
  • the guide bushings l7, 18 are fixed in position and the distance apart of the guide cations does not alter as the piston 7 moves.
  • a hydraulic forging press having a fixed cross-head
  • a press ram having an internally stepped press cylinder, a press piston, a piston rod connected to the press piston, the piston rod being of smaller diameter than the press piston to define a step therebetween and the press cylinder having an internal wall defining a corresponding step, and means for admitting pressure fluid between said steps to actuate the piston, the press cylinder being fixed to the fixed crosshead and the press piston being for carrying a forging tool,
  • a platen for carrying a second forging tool for cooperating with the first forging tool
  • retraction piston means for acting on the piston rod to retract the press piston.
  • the retraction piston means includes a cross-piece cooperating with the piston rod and pressure fluid means for retracting the cross-piece.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Press Drives And Press Lines (AREA)
US00200957A 1970-11-20 1971-11-22 Forging press Expired - Lifetime US3777539A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2056994A DE2056994C2 (de) 1970-11-20 1970-11-20 Hydraulische Einzylinder-Schmiedepresse

Publications (1)

Publication Number Publication Date
US3777539A true US3777539A (en) 1973-12-11

Family

ID=5788602

Family Applications (1)

Application Number Title Priority Date Filing Date
US00200957A Expired - Lifetime US3777539A (en) 1970-11-20 1971-11-22 Forging press

Country Status (5)

Country Link
US (1) US3777539A (it)
DE (1) DE2056994C2 (it)
FR (1) FR2115216B1 (it)
GB (1) GB1365539A (it)
IT (1) IT940609B (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4260346A (en) * 1979-10-09 1981-04-07 Anderson Jr Raymond B Press assembly for powder material

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10164C (de) * FREYBURGER'schem System. P. PFLEIDERER in London Neuerungen an Knet- und Mischmaschinen insbesondere nach
DE477298C (de) * 1929-06-05 Adolf Kreuser G M B H Stehende Lochpresse
DE674113C (de) * 1935-11-10 1939-04-05 Adolf Kreuser G M B H Fuehrung fuer das Querhaupt einer durch Druckfluessigkeit angetriebenen Schmiedepresse
US2169113A (en) * 1938-04-29 1939-08-08 Charles F Elmes Engineering Wo Hydraulic bending press
US3010432A (en) * 1957-01-30 1961-11-28 Schloemann Ag Controlling means for a hydraulic press
FR1295576A (fr) * 1960-01-05 1962-06-08 Loewy Eng Co Ltd Presse hydraulique verticale
FR1409250A (fr) * 1963-07-05 1965-08-27 Presse à estamper ou presse analogue commandée par un fluide de pression
US3592131A (en) * 1969-06-11 1971-07-13 Verson Allsteel Press Co Hydraulic cylinder apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1145462B (de) * 1959-05-20 1963-03-14 Hydraulik Gmbh Hydraulische Schmiedpresse in Unterflur-Bauart

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10164C (de) * FREYBURGER'schem System. P. PFLEIDERER in London Neuerungen an Knet- und Mischmaschinen insbesondere nach
DE477298C (de) * 1929-06-05 Adolf Kreuser G M B H Stehende Lochpresse
DE674113C (de) * 1935-11-10 1939-04-05 Adolf Kreuser G M B H Fuehrung fuer das Querhaupt einer durch Druckfluessigkeit angetriebenen Schmiedepresse
US2169113A (en) * 1938-04-29 1939-08-08 Charles F Elmes Engineering Wo Hydraulic bending press
US3010432A (en) * 1957-01-30 1961-11-28 Schloemann Ag Controlling means for a hydraulic press
FR1295576A (fr) * 1960-01-05 1962-06-08 Loewy Eng Co Ltd Presse hydraulique verticale
FR1409250A (fr) * 1963-07-05 1965-08-27 Presse à estamper ou presse analogue commandée par un fluide de pression
US3592131A (en) * 1969-06-11 1971-07-13 Verson Allsteel Press Co Hydraulic cylinder apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4260346A (en) * 1979-10-09 1981-04-07 Anderson Jr Raymond B Press assembly for powder material

Also Published As

Publication number Publication date
DE2056994A1 (de) 1972-05-25
GB1365539A (en) 1974-09-04
FR2115216B1 (it) 1974-08-19
FR2115216A1 (it) 1972-07-07
DE2056994C2 (de) 1982-03-25
IT940609B (it) 1973-02-20

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