WO2008128914A2 - Punching machine. - Google Patents

Punching machine. Download PDF

Info

Publication number
WO2008128914A2
WO2008128914A2 PCT/EP2008/054478 EP2008054478W WO2008128914A2 WO 2008128914 A2 WO2008128914 A2 WO 2008128914A2 EP 2008054478 W EP2008054478 W EP 2008054478W WO 2008128914 A2 WO2008128914 A2 WO 2008128914A2
Authority
WO
WIPO (PCT)
Prior art keywords
plate
punch
seat
diameter
base
Prior art date
Application number
PCT/EP2008/054478
Other languages
French (fr)
Other versions
WO2008128914A3 (en
Inventor
Sergio Dallan
Original Assignee
Dallan S.P.A.
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 Dallan S.P.A. filed Critical Dallan S.P.A.
Priority to AT08736181T priority Critical patent/ATE492359T1/en
Priority to DE602008004134T priority patent/DE602008004134D1/en
Priority to PL08736181T priority patent/PL2146811T3/en
Priority to EP08736181A priority patent/EP2146811B1/en
Priority to SI200830177T priority patent/SI2146811T1/en
Publication of WO2008128914A2 publication Critical patent/WO2008128914A2/en
Publication of WO2008128914A3 publication Critical patent/WO2008128914A3/en

Links

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
    • B21D28/24—Perforating, i.e. punching holes
    • B21D28/26—Perforating, i.e. punching holes in sheets or flat parts
    • 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
    • B21D19/00—Flanging or other edge treatment, e.g. of tubes
    • B21D19/12—Edge-curling
    • B21D19/14—Reinforcing edges, e.g. armouring same

Definitions

  • the present invention relates to a punching machine.
  • the object of the invention is to provide a punching machine which also radiuses the edge of the hole formed by the punch. This object is attained according to the invention by a punching machine for sheet metal strip as described in claim 1 .
  • Figure 1 is a longitudinal section through a punching machine according to the invention
  • Figures 2, 3, 4, 5 and 6 show it in its various operating stages
  • Figure 7 is a detailed view of the punch head.
  • the punching machine of the invention comprises substantially a base 2 provided with columns 4 for guiding an upper horizontal plate 6 drivable vertically by a piston 8.
  • the plate 6 is provided with a seat 10 for housing the heads 12 of threaded bolts 14 which with their lower end engage in a second plate 16 supporting a punch guide 18 within which a punch 20 slides rigid with the plate 6.
  • the plate 16 is guided along the columns 4, and is also guided along columns 22 provided lowerly with a plate 24 housed in a seat 26 provided in the base 2.
  • the plate 24 is provided upperly with a die 28 within which a counter- punch slides rigid with the plate 2.
  • the die is provided internally with two channels 32, 34 for feeding an air jet and discharging scrap respectively.
  • Pairs of springs 36 are interposed between the plate 6 and the plate 16, with pairs of springs 38 interposed between the bottom of the seat 26 and the lower surface of the plate 24.
  • the springs 36 have a rigidity less than that of the springs 38.
  • the head 40 of the punch 20 has smaller dimensions than those of its shank 42 (the diameter of which is less than the diameter of the counter- punch 30) and is connected to it by a frusto-conical portion 44.
  • the upper surface of the counter-punch is provided with a frusto- conical portion 46, the outer diameter of which is greater than the diameter of the head 40 of the punch 20 but less than the diameter of the shank 42.
  • the machine of the invention operates in the following manner.
  • the plate 6 When not in use, the plate 6 is in the configuration of maximum distance from the plate 2, the springs 36 and 38 maintaining the plate 6 with the plate 16, and the plate 24 with the base 2, in the configuration of greatest distance apart (see Figure 1 ).
  • the punch 20 is completely inserted into the punch guide 18.
  • the metal sheet 48 is advanced so that it becomes positioned on the die 28, after which the piston 8 is operated to lower the plate 6 and hence the plate 16 (by means of the springs 36) until the punch guide 18 rests on the die 28 to retain the metal sheet (see Figure 2).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

A punching machine for sheet metal strip, characterised by comprising: -a base (2), -a horizontal first plate (6) movable vertically under external command, -a punch (20) rigid with saidfirst plate (6) and slidable within a punch guide (18) rigid with a horizontal second plate (16), -means (12, 14) for slidably constraining said second plate (16) relative to said first plate (6), -first elastic means (36) interposed between said first plate (6) and said second plate (16), -a horizontal third plate (24) housed in a seat provided in the base (2), -means (22) enabling said third plate (24) to be moved vertically by said first plate (6), -second elastic means (38) interposed between the lower surface of said third plate (24) and the bottom of the seat (26), said second means having a greater constant of elastic rigidity than the first elastic means, -a die (28) rigid with the base (2) and facing the punch guide (18), -a counter-punch (30) slidable within said die (18), rigid with said movable third plate (24), said die (18) being provided internally with an air jet feed channel (32) and a scrap discharge channel (34), these communicating with the seat of the counter-punch (30), the punchhead (40) having a diameter less than the diameter of its seat in the punch guide (18), said seat being of smaller diameter than the counter-punch (30), the counter-punch (30) being provided at that end facing the punch (20) with a frusto-conical portion (46), the major base of which has a diameter less than the diameter of the punch seat and the minor base of which has a diameter greater than the diameter of the punch head (40).

Description

PUNCHING MACHINE
The present invention relates to a punching machine.
The object of the invention is to provide a punching machine which also radiuses the edge of the hole formed by the punch. This object is attained according to the invention by a punching machine for sheet metal strip as described in claim 1 .
A preferred embodiment of the present invention is further clarified hereinafter with reference to the accompanying drawings, in which: Figure 1 is a longitudinal section through a punching machine according to the invention,
Figures 2, 3, 4, 5 and 6 show it in its various operating stages, and Figure 7 is a detailed view of the punch head.
As can be seen from the figures, the punching machine of the invention comprises substantially a base 2 provided with columns 4 for guiding an upper horizontal plate 6 drivable vertically by a piston 8.
The plate 6 is provided with a seat 10 for housing the heads 12 of threaded bolts 14 which with their lower end engage in a second plate 16 supporting a punch guide 18 within which a punch 20 slides rigid with the plate 6. The plate 16 is guided along the columns 4, and is also guided along columns 22 provided lowerly with a plate 24 housed in a seat 26 provided in the base 2.
The plate 24 is provided upperly with a die 28 within which a counter- punch slides rigid with the plate 2. The die is provided internally with two channels 32, 34 for feeding an air jet and discharging scrap respectively. Pairs of springs 36 are interposed between the plate 6 and the plate 16, with pairs of springs 38 interposed between the bottom of the seat 26 and the lower surface of the plate 24.
The springs 36 have a rigidity less than that of the springs 38. The head 40 of the punch 20 has smaller dimensions than those of its shank 42 (the diameter of which is less than the diameter of the counter- punch 30) and is connected to it by a frusto-conical portion 44.
The upper surface of the counter-punch is provided with a frusto- conical portion 46, the outer diameter of which is greater than the diameter of the head 40 of the punch 20 but less than the diameter of the shank 42.
The machine of the invention operates in the following manner.
When not in use, the plate 6 is in the configuration of maximum distance from the plate 2, the springs 36 and 38 maintaining the plate 6 with the plate 16, and the plate 24 with the base 2, in the configuration of greatest distance apart (see Figure 1 ). The punch 20 is completely inserted into the punch guide 18.
The metal sheet 48 is advanced so that it becomes positioned on the die 28, after which the piston 8 is operated to lower the plate 6 and hence the plate 16 (by means of the springs 36) until the punch guide 18 rests on the die 28 to retain the metal sheet (see Figure 2).
Subsequent lowering of the plate 2 has the following effect (see Figure
3):
- emergence of the punch from the punch guide,
- commencement of the punching step by the punch head, - lowering of the plate 24 into the seat 26. As the descent of the plate 24 continues, the initial effect (Figure 4) is as follows:
- further lowering of the plate 24,
- total punching of the metal sheet, - compression of the springs 36 and 38, followed by (see Figure 5):
- fall of the punched-out scrap,
- its expulsion along the channel 34 by the programmed air jet,
- 90° flanging of the profile edge about the hole by the mutual interaction between the die 28 and the punch guide 18.
At this point the plate 2 is made to rise by the piston 8, resulting in (see Figure 6):
- raising of the punch 20 along the punch guide, this being always in contact with the die 28 by virtue of the elastic reaction of the spring 38, which is greater than the elastic reaction of the spring 36,
- interaction between the frusto-conical portion 46 of the counter-punch 30 and the flanged edge of the metal sheet to bend it U-shaped against the punch guide 18.

Claims

C L A I M S 1 . A punching machine for sheet metal strip, characterised by comprising:
- a base (2),
- a horizontal first plate (6) movable vertically under external command, - a punch (20) rigid with said first plate (6) and slidable within a punch guide (18) rigid with a horizontal second plate (16),
- means (12, 14) for slidably constraining said second plate (16) relative to said first plate (6),
- first elastic means (36) interposed between said first plate (6) and said second plate (16),
- a horizontal third plate (24) housed in a seat provided in the base (2),
- means (22) enabling said third plate (24) to be moved vertically by said first plate (6),
- second elastic means (38) interposed between the lower surface of said third plate (24) and the bottom of the seat (26), said second means having a greater constant of elastic rigidity than the first elastic means,
- a die (28) rigid with the base (2) and facing the punch guide (18),
- a counter-punch (30) slidable within said die (18), rigid with said movable third plate (24), said die (18) being provided internally with an air jet feed channel (32) and a scrap discharge channel (34), these communicating with the seat of the counter-punch (30), the punch head (40) having a diameter less than the diameter of its seat in the punch guide (18), said seat being of smaller diameter than the counter-punch (30), the counter-punch (30) being provided at that end facing the punch (20) with a frusto-conical portion (46), the major base of which has a diameter less than the diameter of the punch seat and the minor base of which has a diameter greater than the diameter of the punch head (40). 2. A machine as claimed in claim 1 , characterised in that the horizontal plate is movable, driven by a hydraulic cylinder-piston unit (8). 3. A machine as claimed in claim 1 , characterised in that the base (2) is provided with columns (4) for guiding the second and third plate. 4. A machine as claimed in claim 1 , characterised in that the slidable constraining means consist of bolts (14) which at one end engage the second plate and have their head (12) housed in a seat provided in the first plate. 5. A machine as claimed in claim 1 , characterised in that the movement enabling means (22) consist of a punch (20).
PCT/EP2008/054478 2007-04-24 2008-04-14 Punching machine. WO2008128914A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AT08736181T ATE492359T1 (en) 2007-04-24 2008-04-14 PUNCHING MACHINE
DE602008004134T DE602008004134D1 (en) 2007-04-24 2008-04-14 PUNCHING MACHINE
PL08736181T PL2146811T3 (en) 2007-04-24 2008-04-14 Punching machine.
EP08736181A EP2146811B1 (en) 2007-04-24 2008-04-14 Punching machine.
SI200830177T SI2146811T1 (en) 2007-04-24 2008-04-14 Punching machine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVE2007A000026 2007-04-24
IT000026A ITVE20070026A1 (en) 2007-04-24 2007-04-24 PUNCHING MACHINE.-

Publications (2)

Publication Number Publication Date
WO2008128914A2 true WO2008128914A2 (en) 2008-10-30
WO2008128914A3 WO2008128914A3 (en) 2008-12-18

Family

ID=39798122

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/054478 WO2008128914A2 (en) 2007-04-24 2008-04-14 Punching machine.

Country Status (9)

Country Link
EP (1) EP2146811B1 (en)
AT (1) ATE492359T1 (en)
DE (1) DE602008004134D1 (en)
ES (1) ES2356583T3 (en)
IT (1) ITVE20070026A1 (en)
PL (1) PL2146811T3 (en)
PT (1) PT2146811E (en)
SI (1) SI2146811T1 (en)
WO (1) WO2008128914A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102699229B (en) * 2012-05-25 2014-08-06 王瑞峰 Waste detecting and discharging device and punch press with same
CN102699230A (en) * 2012-05-28 2012-10-03 奇瑞汽车股份有限公司 Trimming scrap iron discharging mechanism for automobile covering part
ITPD20120177A1 (en) 2012-05-31 2013-12-01 Dallan Spa LAMELLA FOR VENETIAN CURTAINS, VENETIAN CURTAINS AND METHOD OF PRODUCTION OF SUCH A VENETIAN TENT

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0060355A1 (en) * 1981-03-17 1982-09-22 Edward Donald Bennett Apparatus for producing a blank from stock material
JPH11319990A (en) * 1998-05-18 1999-11-24 Toyota Motor Corp Press die for combined working
DE10149546A1 (en) * 2001-10-08 2003-04-30 Fraunhofer Ges Forschung Forming method for functional area in metal plates, e.g. for hydraulics, pneumatics, IC engines, etc. uses forming tool with punch to upset plate edge against shaping tool to create material build-up
DE202005010990U1 (en) * 2005-07-11 2005-09-22 Großmann, Hans, Dipl.-Ing.(FH) Stamping and/or deforming device for workpieces has second stamp guide plate of upper tool in form of holding-down element

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0060355A1 (en) * 1981-03-17 1982-09-22 Edward Donald Bennett Apparatus for producing a blank from stock material
JPH11319990A (en) * 1998-05-18 1999-11-24 Toyota Motor Corp Press die for combined working
DE10149546A1 (en) * 2001-10-08 2003-04-30 Fraunhofer Ges Forschung Forming method for functional area in metal plates, e.g. for hydraulics, pneumatics, IC engines, etc. uses forming tool with punch to upset plate edge against shaping tool to create material build-up
DE202005010990U1 (en) * 2005-07-11 2005-09-22 Großmann, Hans, Dipl.-Ing.(FH) Stamping and/or deforming device for workpieces has second stamp guide plate of upper tool in form of holding-down element

Also Published As

Publication number Publication date
SI2146811T1 (en) 2011-04-29
EP2146811B1 (en) 2010-12-22
ES2356583T3 (en) 2011-04-11
DE602008004134D1 (en) 2011-02-03
ATE492359T1 (en) 2011-01-15
PT2146811E (en) 2011-01-28
ITVE20070026A1 (en) 2008-10-25
EP2146811A2 (en) 2010-01-27
WO2008128914A3 (en) 2008-12-18
PL2146811T3 (en) 2011-05-31

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