US3355931A - Die forging machine - Google Patents

Die forging machine Download PDF

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Publication number
US3355931A
US3355931A US458661A US45866165A US3355931A US 3355931 A US3355931 A US 3355931A US 458661 A US458661 A US 458661A US 45866165 A US45866165 A US 45866165A US 3355931 A US3355931 A US 3355931A
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United States
Prior art keywords
hammers
pair
die
workpiece
forging machine
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Expired - Lifetime
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US458661A
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English (en)
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Kralowetz Bruno
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Individual
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Individual
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Publication of US3355931A publication Critical patent/US3355931A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J7/00—Hammers; Forging machines with hammers or die jaws acting by impact
    • B21J7/02—Special design or construction
    • B21J7/14—Forging machines working with several hammers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/14—Bending rods, profiles, or tubes combined with measuring of bends or lengths
    • 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
    • B21J9/02—Special design or construction
    • B21J9/06—Swaging presses; Upsetting presses

Definitions

  • This invention relates to a die forging machine, in which die-carrying hammers blow from opposite sides against the bar stock which is introduced between the dies.
  • a known machine of this type comprises two hammers, which constitute connecting rods driven by eccentrics. Each hammer carries a preforging die and a finishing die one beside the other.
  • a feeding mechanism consisting of a plurality of displaceable grippers, which grip in alternation, is provided for an intermittent feeding of the workpiece. The entire deformation of each workpiece portion is effected by a plurality of hammer blows. As the number of blows per unit of time cannot be indefinitely increased with such eccentric-driven hammers, for design reasons, deforming speeds in excess of 0.3-0.4 meter per second cannot be used.
  • the invention resides essentially in that a pair of hammers provided with finishing dies, and another pair of hammers, which are offset by an angle of 90 from the former and whose axis lies in the same normal plane to the workpiece aXis, are provided, said other pair of hammers carrying preshaping dies or preshaping tools, the two pairs of hammers blow in alternation and at least the pair of hammers which carries the finishing dies is adapted to be driven by compressed gas in known manner.
  • the drive by means of compressed gas permits an increase in blowing speed to 15 meters per second and more and ensures that the workpiece is finished by one blow and at high speed and with a short contact time between the tool and the workpiece.
  • each hammer can be designed with small dimensions and with a light weight as it must carry only one die or tool so that it can be accelerated to a very high velocity by a desired, predetermined blowing energy.
  • the preshaping may be effected in a plurality of blows.
  • the workpiece may be rotated and may also be displaced in its longitudinal direction. In many cases it will be necessary to rotate the workpiece through when it has been preshaped so that the workpiece is in its correct position relative to the finishing dies.
  • the arrangement according to the invention is particularly desirable for forging cranked portions because in this case the finishing dies can be applied immediately after the workpiece has been prebent or offset by the preshaping tools without need for rotating the workpiece.
  • FIGS. 1 and 2 show a die forging machine in a sectional view taken transversely to the workpiece axis and in a sectional view taken along this axis.
  • the feeding mechanism and other details are not shown.
  • a forging box 1 forms guides 2 for four hammers 3, 4, which are angularly spaced 90 apart and whose axes lie in the same vertical plane.
  • the hammers 3, 4 are connected by rods 5 to pistons 6, which are slidable in cylinders 7.
  • the blowing movements of the hammers 3 and 4 are directed toward each other and effected by compressed gas, which does not act directly on the pistons 6, but operates an auxiliary piston, not shown, from which the movement is hydraulically transmitted by the supply conduits 8 to the pistons 6.
  • the return of the pistons 6 to their initial position and of the hammers 3, 4 to their position of rest is effected by the application of pressure liquid to the rod ends of the pistons 6 through the conduits 9.
  • the pressure fluid is displaced from this end of the piston into a pressure accumulator 10 associated with each piston.
  • the two hammers 3 carry pre-shaping dies 11 and the hammers 4 are provided with the finishing dies 12.
  • the bar stock When the bar stock has been heated, it is moved between the pairs of hammers 3, 4 by a feeding mechanism, which is not shown. While the hammers 4 are retracted, the bar end is then preforged by means of the hammers 3 and the preshaping tools 11.
  • the workpiece may then be rotated through 90 and is subsequently finished by a single blow of the hammers 4 and the finishing dies 12.
  • a temperature measuring instrument (not shown) checks each workpiece for the correct forging temperature and by means of an electric control circuit initiates the automatic forging cycle only when the forging temperatures are within the desired, adjustable range. When the first workpiece has been finished, the bar is advanced to a suitable extent and the entire cycle is repeated.
  • a die forging machine which comprises a first pair of mutually opposite hammers, each of which carries a pre-shaping tool, a second pair of mutually opposite hammers, each of which carries a finishing die, said pairs of hammers being disposed in a common plane and spaced from each other by an angle of 90, and hammer drive means for driving said pairs of hammers in alternation to perform blows against opposite sides of bar stock introduced between said hammers in a longitudinal direction which is normal to said plane, said hammer drive means comprising a compressed gas source for driving said second pair of hammers.
  • a die forging machine which comprises a first pair of mutually opposite hammers, each of which carries a pre-shaping tool, a second pair of mutually opposite hammers, each of which carries a finishing die, said pairs of hammers being disposed in a common plane and spaced References Cited UNITED STATES PATENTS 330,262 11/1885 Richardson 72-404- 443,030 12/1890 Wood 72-402 455,905 7/1891 Thomson 72403 3,263,465 8/1966 Way 72-294 CHARLES W. LANHAM, Primary Examiner.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
US458661A 1964-07-10 1965-05-25 Die forging machine Expired - Lifetime US3355931A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT594564A AT244716B (de) 1964-07-10 1964-07-10 Gesenkschmiedemaschine

Publications (1)

Publication Number Publication Date
US3355931A true US3355931A (en) 1967-12-05

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ID=3581267

Family Applications (1)

Application Number Title Priority Date Filing Date
US458661A Expired - Lifetime US3355931A (en) 1964-07-10 1965-05-25 Die forging machine

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US (1) US3355931A (de)
AT (1) AT244716B (de)
DE (1) DE1303852C2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4446580A1 (de) * 1994-12-24 1996-07-04 Pahnke Eng Gmbh & Co Kg Doppelpresse

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US330262A (en) * 1885-11-10 richardson
US443030A (en) * 1890-12-16 Pneumatic tool
US455905A (en) * 1891-07-14 Automatic hammer
US3263465A (en) * 1961-12-14 1966-08-02 Arthur L Way Apparatus for and method of severing and sealing hollow conduit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US330262A (en) * 1885-11-10 richardson
US443030A (en) * 1890-12-16 Pneumatic tool
US455905A (en) * 1891-07-14 Automatic hammer
US3263465A (en) * 1961-12-14 1966-08-02 Arthur L Way Apparatus for and method of severing and sealing hollow conduit

Also Published As

Publication number Publication date
DE1303852C2 (de) 1974-01-31
AT244716B (de) 1966-01-25
DE1303852B (de) 1973-07-05

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