EP1445041B1 - Device for the detection of the position of punches in a sheet metal punching machine with several punches - Google Patents

Device for the detection of the position of punches in a sheet metal punching machine with several punches Download PDF

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Publication number
EP1445041B1
EP1445041B1 EP04075318A EP04075318A EP1445041B1 EP 1445041 B1 EP1445041 B1 EP 1445041B1 EP 04075318 A EP04075318 A EP 04075318A EP 04075318 A EP04075318 A EP 04075318A EP 1445041 B1 EP1445041 B1 EP 1445041B1
Authority
EP
European Patent Office
Prior art keywords
pistons
punches
piston
transducer
detection
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
EP04075318A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1445041A1 (en
Inventor
Ruggero Battaglia
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.)
Salvagnini Italia SpA
Original Assignee
Salvagnini Italia 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
Application filed by Salvagnini Italia SpA filed Critical Salvagnini Italia SpA
Publication of EP1445041A1 publication Critical patent/EP1445041A1/en
Application granted granted Critical
Publication of EP1445041B1 publication Critical patent/EP1445041B1/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
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • 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
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/24—Perforating, i.e. punching holes
    • B21D28/246—Selection of punches

Definitions

  • the present invention concerns a device for the detection of the position of the punches in a sheet metal punching machine with several punches (see for instance US-A-5 301 585)
  • punching machines with multipress head that are made up of a plurality of hydraulic presses, one near the other, each one of which controls the vertical motion of a single punch.
  • the object of the present invention is to provide a device for the detection of the position of the punch, that is usable for a plurality of punches of a machine with a number of punches of the aforesaid type.
  • a device for the detection of the position of punches in a sheet metal punching machine comprising a plurality of punches controlled by respective pistons, characterised in that it comprises a single position transducer that is operatingly coupled to all the aforesaid pistons in unidirectional way so as to follow the punching movement of any piston, while the other pistons remain in rest position.
  • Each press 1-4 is made up of a hydraulic cylinder 6-9 and of a piston 10-13 to which a respective punch 5 is fastened.
  • a stem 35-38 extends upward onto which an arm 39-42 that projects laterally is fastened.
  • the arms 39-42 of all the pistons 10-13 rest on a same plate 43 which is fastened in the mobile part 44 of a position transducer 45 connected with an electronic control unit 46.
  • the plate 43 is thrust upward by a spring 47.
  • a hydraulic control circuit which comprises a servovalve 34 with outlet connected with the lower chambers of logical elements 16-19 by a duct 20 and pre-setting valves 14-15 connected, downstream, with the upper chambers of the logical elements 16-19 and with control inlets of nonreturn valves 21-24 by ducts 25-28 and, upstream, with the bottom chambers of the hydraulic cylinders 6-9 by a duct 29.
  • the duct 29 of the hydraulic circuit is supplied by a pump 48 which is connected by a duct 49 with the inlet of the servovalve 34, with a pressure accumulator 50 and with a safety valve 51.
  • the servovalve 34 and the pre-setting valves 14-15 are controlled by the control unit 46.
  • FIG 2 the hydraulic circuit is shown in the condition in which the position B 34 of the servovalve and the position A of the pre-setting valve 14 cause the pre-setting of the piston 10 and the relative punch 5 to the descent.
  • Such pre-setting is generated by the closing of the nonreturn valve 21, whose control inlet is connected to discharge.
  • the piston 10 is ready to receive pressure on the upper face.
  • the nonreturn valves 22-24, the pre-setting valve 15 and the pistons 11-13 are in the condition of Figure 1.
  • FIG 3 the hydraulic circuit is shown in the condition in which the operating position A of the servovalve 34 and the operating position A of the pre-setting valve 14 cause the descent of the piston 10.
  • Such movement is generated by the increase in pressure of the upper chamber of the hydraulic cylinder 6, due to the lifting movement of the logical element 16, caused by the discharge of the upper chamber of the same logical element 16.
  • the lower chamber of piston 10 remains in pressure, but its thrust area is smaller than the one of the upper chamber so that the net force on the piston 10 is as a result directed downward.
  • the non-return valve 21 is closed; the nonreturn valves 21, 23 and 24, the pre-setting valve 15 and the pistons 10, 12 and 13 are in the condition of Figure 1.
  • the descent of the piston 11 is controlled in similar way by switching the valve 14 in position C from the situation in Figure 1 to the one in Figure 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Punching Or Piercing (AREA)
  • Details Of Cutting Devices (AREA)
  • Control Of Presses (AREA)
EP04075318A 2003-02-07 2004-02-03 Device for the detection of the position of punches in a sheet metal punching machine with several punches Expired - Lifetime EP1445041B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20030217 2003-02-07
IT000217A ITMI20030217A1 (it) 2003-02-07 2003-02-07 Dispositivo per il rilevamento della posizione dei punzoni

Publications (2)

Publication Number Publication Date
EP1445041A1 EP1445041A1 (en) 2004-08-11
EP1445041B1 true EP1445041B1 (en) 2005-10-19

Family

ID=32652467

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04075318A Expired - Lifetime EP1445041B1 (en) 2003-02-07 2004-02-03 Device for the detection of the position of punches in a sheet metal punching machine with several punches

Country Status (6)

Country Link
EP (1) EP1445041B1 (it)
AT (1) ATE306995T1 (it)
DE (1) DE602004000132T2 (it)
DK (1) DK1445041T3 (it)
ES (1) ES2248782T3 (it)
IT (1) ITMI20030217A1 (it)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109013864A (zh) * 2018-09-14 2018-12-18 河南均美铝业有限公司 一种铝合金用冲压组合模具

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3295105B2 (ja) * 1991-05-27 2002-06-24 株式会社アマダ パンチプレス機
EP0700736B1 (en) * 1991-10-18 1999-03-24 Institute Of Technology Precision Electrical Discharge Work's Index-feed machining system
IT1278959B1 (it) * 1995-02-24 1997-12-02 Sapim Amada Spa Attuatore idraulico per punzoni e simili organi scorrevoli per la lavorazione di lamiere, ed impianto incorporante tale attuatore.

Also Published As

Publication number Publication date
ES2248782T3 (es) 2006-03-16
DK1445041T3 (da) 2006-05-29
ITMI20030217A1 (it) 2004-08-08
DE602004000132T2 (de) 2006-07-06
EP1445041A1 (en) 2004-08-11
DE602004000132D1 (de) 2006-03-02
ATE306995T1 (de) 2005-11-15

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