EP0447839B2 - Method to forge with a swaging machine, and a swaging machine suitable to carry out the method - Google Patents

Method to forge with a swaging machine, and a swaging machine suitable to carry out the method Download PDF

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Publication number
EP0447839B2
EP0447839B2 EP91102753A EP91102753A EP0447839B2 EP 0447839 B2 EP0447839 B2 EP 0447839B2 EP 91102753 A EP91102753 A EP 91102753A EP 91102753 A EP91102753 A EP 91102753A EP 0447839 B2 EP0447839 B2 EP 0447839B2
Authority
EP
European Patent Office
Prior art keywords
piston
swaging machine
carry out
swaging
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
EP91102753A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0447839A1 (en
EP0447839B1 (en
Inventor
Antonino Duri'
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.)
Danieli and C Officine Meccaniche SpA
Original Assignee
Danieli and C Officine Meccaniche SpA
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
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Application filed by Danieli and C Officine Meccaniche SpA filed Critical Danieli and C Officine Meccaniche SpA
Publication of EP0447839A1 publication Critical patent/EP0447839A1/en
Application granted granted Critical
Publication of EP0447839B1 publication Critical patent/EP0447839B1/en
Publication of EP0447839B2 publication Critical patent/EP0447839B2/en
Anticipated expiration legal-status Critical
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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
    • B21J11/00—Forging hammers combined with forging presses; Forging machines with provision for hammering and pressing
    • 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
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J7/00—Hammers; Forging machines with hammers or die jaws acting by impact
    • B21J7/20—Drives for hammers; Transmission means therefor
    • B21J7/46—Control devices specially adapted to forging hammers, not restricted to one of the preceding subgroups

Definitions

  • the invention concerns a hydraulic swaging machine.
  • the invention concerns a device which makes it possible to obtain a differentiated frequency of hammering during the forging step with a hydraulic swaging machine for metals.
  • Hydraulic swaging machines of the type to which the invention is applied are disclosed and illustrated, for instance, in EP-A-0.297.312, US-A-4,745,793 or US-A-3,707, 866.
  • swaging machines are required which can work firstly for the roughing and then for the finishing.
  • DE-A-2.306.566 is known and discloses a swaging machine with a pump having two displacements and driven by a motor the speed of which can be adjusted according to the desired frequency.
  • This system makes necessary power commutation valves, power switching assemblies and other power devices.
  • the hydraulic swaging machine according to the invention is defined in the claim.
  • the hammers of the swaging machine can perform at least two different strokes, a long stroke and a short stroke; the short stroke is associated with a greater frequency of hammer blows; this frequency may be four times or more greater than the slow frequency.
  • the drive motor may be an electric D.C. motor or an electric motor with a sliding connection or any other system which enables the speed of the drive shaft to be varied.
  • Each pump assembly of the hydraulic swaging machine is equipped with means suitable to modify its displacement.
  • This modification in its simplest form provides for the obtaining of two different displacements for each piston of the pump.
  • Modification of the displacement alters the quantity of oil aspirated by and pumped into the actuation chamber of the piston that bears the hammer in question.
  • the auxiliary piston may be formed with concentric elements, each of which can take up both the inactive and the working positions. These concentric elements, being one or more in number, can be set to work as required so as to obtain as many different displacements.
  • alteration of the displacement alters also the quantity of hydraulic oil displaced and thus modifies the stroke of the specific piston that bears the hammer in question.
  • Fig.1 shows a diagram of a vertical section of a pump 10 corresponding to a main piston 11.
  • a chamber 13 in which the main piston 11 plunges is connected to the specific piston of the hydraulic swaging machine (not shown in the figures) through a pipe 12.
  • the hydraulic swaging machine may be of the type disclosed in EP-A-0.297.312 or in US-A-4,745,793 or be of another known type.
  • the main piston 11 is displaced axially by a connecting rod 14 actuated by a crankshaft 15 set in rotation by a motor 16.
  • the number of strokes per unit of time can be varied by speeding up or slowing down the rotation of the crankshaft 15, namely by acting on the motor 16 and crankshaft 15.
  • auxiliary piston 18 is positioned by an actuation piston 19 actuated by fluid under pressure coming from the pipe of a reservoir 17.
  • a variant of the invention shown diagrammatically in Fig.2 for instance, provides for two or more auxiliary pistons cooperating with the upper surface of the main piston 11.
  • auxiliary pistons may be independent and be positioned, for instance, along a circumference, or may be coaxial.
  • Fig.2 shows an example of coaxial auxiliary pistons.
  • each auxiliary piston 18 has a positioner assembly 20 comprising, for instance, a gear wheel-rack coupling 22, which in this case includes springs 21 to enable the auxiliary piston 18 to follow the stroke of the main piston 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Press Drives And Press Lines (AREA)
EP91102753A 1990-03-19 1991-02-25 Method to forge with a swaging machine, and a swaging machine suitable to carry out the method Expired - Lifetime EP0447839B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT83351A IT1240874B (it) 1990-03-19 1990-03-19 Procedimento di fucinatura con una martellatrice e martellatrice idonea a concretizzare tale procedimento
IT8335190 1990-03-19

Publications (3)

Publication Number Publication Date
EP0447839A1 EP0447839A1 (en) 1991-09-25
EP0447839B1 EP0447839B1 (en) 1994-08-10
EP0447839B2 true EP0447839B2 (en) 1997-12-03

Family

ID=11320576

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91102753A Expired - Lifetime EP0447839B2 (en) 1990-03-19 1991-02-25 Method to forge with a swaging machine, and a swaging machine suitable to carry out the method

Country Status (7)

Country Link
EP (1) EP0447839B2 (it)
AT (1) ATE109696T1 (it)
DE (1) DE69103301T3 (it)
ES (1) ES2060217T5 (it)
IT (1) IT1240874B (it)
RU (1) RU2035253C1 (it)
UA (1) UA27251C2 (it)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113172189A (zh) * 2021-04-09 2021-07-27 河南中原特钢装备制造有限公司 细化长棒类钢锻件晶粒度的锻造方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT264974B (de) * 1966-12-13 1968-09-25 Voest Ag Schmiedemaschine zum Pressen und Schalgen von Formstücken
DE1627421A1 (de) * 1967-08-01 1970-11-05 Otto Dr Ing Georg Sowohl als Hammer als auch als Presse betreibbare Umformmaschine
AT271143B (de) * 1967-10-09 1969-05-27 Langestein & Schemann Ag Maschine zur Unformung eines Werkstückes zwischen zwei Bären
AT289513B (de) * 1969-06-27 1971-04-26 Ges Fertigungstechnik & Maschb Schmiedemaschine

Also Published As

Publication number Publication date
RU2035253C1 (ru) 1995-05-20
EP0447839A1 (en) 1991-09-25
ES2060217T5 (es) 1998-02-16
DE69103301D1 (de) 1994-09-15
IT1240874B (it) 1993-12-17
DE69103301T3 (de) 1998-03-05
IT9083351A1 (it) 1991-09-19
ATE109696T1 (de) 1994-08-15
UA27251C2 (uk) 2000-08-15
DE69103301T2 (de) 1995-01-05
IT9083351A0 (it) 1990-03-19
ES2060217T3 (es) 1994-11-16
EP0447839B1 (en) 1994-08-10

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