EP0251796B1 - Improvements in or relating to punches and presses - Google Patents
Improvements in or relating to punches and presses Download PDFInfo
- Publication number
- EP0251796B1 EP0251796B1 EP19870305861 EP87305861A EP0251796B1 EP 0251796 B1 EP0251796 B1 EP 0251796B1 EP 19870305861 EP19870305861 EP 19870305861 EP 87305861 A EP87305861 A EP 87305861A EP 0251796 B1 EP0251796 B1 EP 0251796B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- piston
- punch
- piston arrangement
- assembly
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
- B30B1/007—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen using a fluid connection between the drive means and the press ram
-
- 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
- B21D28/32—Perforating, i.e. punching holes in other articles of special shape
Definitions
- the present invention relates to punches and presses and especially, but not exclusively, to punches for piercing, forming or trimming apertures in sheet metal or other material.
- the invention is concerned also with auxiliary presses where a moving tool, normally shaped, is moved towards a fixed tool to shape a sheet metal member therebetween. Effectively the difference between punches and auxiliary presses is that the punch pierces the workpiece while the press does not.
- punches and presses will be referred to as punches.
- a known system comprises one or more punches which are fixed to a lower non-movable member of a press or press tool and are operated by lowering an upper member of the press or press tool, the sheet material to be punched being placed on the bed of the press.
- a problem with this system is that the holes may only be punched at a defined angle (normally at right angles) with respect to the workpiece. Where the workpiece is non-planar it often has to be subjected to several operations to achieve apertures in desired positions.
- a punch assembly adapted for mounting on a press tool including a first piston arrangement adapted to carry a punch for forming a workpiece on said tool and mounted in a first cylinder, a second piston arrangement mounted in a second cylinder, fluid connection means between said first and second cylinders and mounting means for said assembly adapted for mounting said assembly on the press tool with the second piston arrangement in the path of travel of a movable member of the press tool, whereby on movement of said member said second piston arrangement is moved into its cylinder to compress fluid therein and said first piston arrangement is moved out of its cylinder by said fluid, characterised in that the said first piston is attached to a guiding member external of the cylinder and received in a guide bore in the mounting means, the punch being mounted, in use, on the guiding member.
- a press tool for shaping sheet metal having a profiled fixed member on which the workpiece to be shaped is supportable and a correspondingly shaped member movable towards said fixed member to shape the workpiece and including also a punch assembly for further forming the workpiece by deforming it in a direction angularly displaced from the direction of movement of said movable member, said punch assembly including a first piston arrangement mounted in a first cylinder, a second piston arrangement mounted in a second cylinder, fluid connection means between said first and second cylinders and mounting means adapted for mounting said assembly on said fixed member of the pressing tool with the second piston arrangement in the path of travel of the movable member whereby movement of the movable member causes movement of said second piston arrangement into its cylinder and corresponding movement of the first piston out of its cylinder to cause said further forming of the workpiece, characterised in that the said first piston is attached to a guiding member external of the cylinder and received in a guide bore in the mounting means, the punch being mounted, in use
- a punch assembly is illustrated in Fig. 1 and comprises a first piston arrangement 10 and a second piston arrangement 20.
- the first piston arrangement comprises a piston 11 and seal 12 and a piston rod 14 attached to a punch mounting member 16.
- the piston is spring urged by a return spring 18 into the position as shown.
- the second piston arrangement 20 comprises an operating plunger or piston 21 with a seal 22 which is operated by a force applied in the direction of arrow 24.
- the piston 21 is movable in a cylinder 28 arranged substantially at right angles in the same block 13 as the cylinder 15 in which piston 11 is movable.
- the piston arrangement 20 is driven in operation into the cylinder 28 by a member (not shown) of a press on which the punch assembly is mounted and therefore the speed at which the piston travels is determined by the operating speed of the press.
- the punch mounting member 16 attached to the end of piston rod 14 by a screw 34 is adapted to mount any commercial headed or ball lock punch retainer (not shown).
- a hydraulic line may be connected to an inlet 50 (shown blocked off in the embodiment of Fig. 1).
- the line is connected to a cylinder 28 in a block (not shown) mounted on the press remote from the block housing piston arrangement 10. It will be realised therefore that one piston arrangement 20 can drive several piston arrangement 10.
- Fig. 1 the piston arrangements 10, 20 are at right angles to each other thereby allowing a vertical operating press to punch holes in a horizontal direction.
- Figs. 2 and 3 show punch assemblies 102 and 103 in which the first and second piston arrangements 10, 20 may be set at different angles.
- angle A between the direction of applied force 24 and punch movement 25 is acute ( ⁇ 90°) and in Fig. 3 angle A is obtuse (> 90°).
- the punch assembly of the invention is therefore extremely versatile being adjustable both in speed, in the angle of punching and in the travel of the punch per unit travelled by the press.
- a complex shaped channel section 60 is shown with two major front faces 62, 64. Face 62 is inclined at an angle forward of the vertical and face 64 rearward of the vertical.
- Both faces can be punches perpendicularly to the face.
- the punch assemblies 102, 103 etc may be operated directly by the upper movable member 66 of a press or may as illustrated, be connected by hydraulic lines 102', 103' to a separate block 52 carrying a piston arrangement 20.
- the spring 18 is replaced by an air or gas spring.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Press Drives And Press Lines (AREA)
Description
- The present invention relates to punches and presses and especially, but not exclusively, to punches for piercing, forming or trimming apertures in sheet metal or other material. The invention is concerned also with auxiliary presses where a moving tool, normally shaped, is moved towards a fixed tool to shape a sheet metal member therebetween. Effectively the difference between punches and auxiliary presses is that the punch pierces the workpiece while the press does not. For simplicity, in this specification, punches and presses will be referred to as punches.
- A known system comprises one or more punches which are fixed to a lower non-movable member of a press or press tool and are operated by lowering an upper member of the press or press tool, the sheet material to be punched being placed on the bed of the press. A problem with this system is that the holes may only be punched at a defined angle (normally at right angles) with respect to the workpiece. Where the workpiece is non-planar it often has to be subjected to several operations to achieve apertures in desired positions.
- A system described in Japanese Patent Application JP-A-60 40 621 and according to the pre-characterising parts of claims 1 and 6 respectively uses a piston and cylinder arrangement to drive the punch. Seal members around the pistons are required to provide a seal and also to guide the piston in the cylinder. It is found to be extremely difficult in practice to satisfactorily achieve both aims.
- It is an object of the present invention to obviate or mitigate the above and other problems.
- According to the present invention there is provided a punch assembly adapted for mounting on a press tool including a first piston arrangement adapted to carry a punch for forming a workpiece on said tool and mounted in a first cylinder, a second piston arrangement mounted in a second cylinder, fluid connection means between said first and second cylinders and mounting means for said assembly adapted for mounting said assembly on the press tool with the second piston arrangement in the path of travel of a movable member of the press tool, whereby on movement of said member said second piston arrangement is moved into its cylinder to compress fluid therein and said first piston arrangement is moved out of its cylinder by said fluid, characterised in that the said first piston is attached to a guiding member external of the cylinder and received in a guide bore in the mounting means, the punch being mounted, in use, on the guiding member.
- Further according to the present invention there is provided a press tool for shaping sheet metal having a profiled fixed member on which the workpiece to be shaped is supportable and a correspondingly shaped member movable towards said fixed member to shape the workpiece and including also a punch assembly for further forming the workpiece by deforming it in a direction angularly displaced from the direction of movement of said movable member, said punch assembly including a first piston arrangement mounted in a first cylinder, a second piston arrangement mounted in a second cylinder, fluid connection means between said first and second cylinders and mounting means adapted for mounting said assembly on said fixed member of the pressing tool with the second piston arrangement in the path of travel of the movable member whereby movement of the movable member causes movement of said second piston arrangement into its cylinder and corresponding movement of the first piston out of its cylinder to cause said further forming of the workpiece, characterised in that the said first piston is attached to a guiding member external of the cylinder and received in a guide bore in the mounting means, the punch being mounted, in use, on the guiding member.
- Embodiments of the present invention will now be described by way of example only with reference to the accompanying drawings, in which:-
- Fig. 1 shows a cross-sectional view of a punch assembly;
- Fig. 2 shows a first angled punch assembly;
- Fig. 3 shows a second angled punch assembly; and
- Fig. 4 shows, diagrammatically, a plurality of punch assemblies illustrating the punching of holes in a complex shaped workpiece.
- A punch assembly is illustrated in Fig. 1 and comprises a
first piston arrangement 10 and asecond piston arrangement 20. - The first piston arrangement comprises a piston 11 and seal 12 and a piston rod 14 attached to a punch mounting member 16. The piston is spring urged by a
return spring 18 into the position as shown. - The
second piston arrangement 20 comprises an operating plunger or piston 21 with aseal 22 which is operated by a force applied in the direction ofarrow 24. The piston 21 is movable in acylinder 28 arranged substantially at right angles in thesame block 13 as thecylinder 15 in which piston 11 is movable. Thepiston arrangement 20 is driven in operation into thecylinder 28 by a member (not shown) of a press on which the punch assembly is mounted and therefore the speed at which the piston travels is determined by the operating speed of the press. - In operation downward movement of the piston 21 into
cylinder 28 increases the pressure of hydraulic fluid in thecylinder 28 which flows through apassage 30 tocylinder 15. This flow of fluid causes piston arrangement 14 to move forward in a horizontal direction out ofcylinder 15 at a force which depends upon the ratio areas of the pistons 11 and 21. - The punch mounting member 16 attached to the end of piston rod 14 by a screw 34 is adapted to mount any commercial headed or ball lock punch retainer (not shown).
- As an alternative to using piston 21 to cause movement of piston 11 a hydraulic line may be connected to an inlet 50 (shown blocked off in the embodiment of Fig. 1). The line is connected to a
cylinder 28 in a block (not shown) mounted on the press remote from the blockhousing piston arrangement 10. It will be realised therefore that onepiston arrangement 20 can driveseveral piston arrangement 10. - In Fig. 1 the
piston arrangements - Figs. 2 and 3
show punch assemblies second piston arrangements force 24 and punch movement 25 is acute (< 90°) and in Fig. 3 angle A is obtuse (> 90°). - The punch assembly of the invention is therefore extremely versatile being adjustable both in speed, in the angle of punching and in the travel of the punch per unit travelled by the press.
- With reference now to Fig. 4 a complex shaped channel section 60 is shown with two major front faces 62, 64. Face 62 is inclined at an angle forward of the vertical and face 64 rearward of the vertical. By using a plurality of punch assemblies as shown in Figs. 2 and 3 both faces can be punches perpendicularly to the face. The
punch assemblies separate block 52 carrying apiston arrangement 20. - In a modification the
spring 18 is replaced by an air or gas spring.
Claims (9)
- A punch assembly adapted for mounting on a press tool including a first piston arrangement (10) adapted to carry a punch for forming a workpiece on said tool and mounted in a first cylinder (15), a second piston arrangement (20) mounted in a second cylinder (28), fluid connection means (30) between said first and second cylinders (15,28) and mounting means (13) for said assembly adapted for mounting said assembly on the press tool with the second piston arrangement (20) in the path of travel of a movable member of the press tool, whereby on movement of said member said second piston arrangement (20) is moved into its cylinder to compress fluid therein and said first piston arrangement (10) is moved out of its cylinder (15) by said fluid, characterised in that the said first piston (10) is attached to a guiding member external of the cylinder (15) and received in a guide bore in the mounting means (13), the punch being mounted, in use, on the guiding member.
- A punch assembly as claimed in claim 1, characterised in that a return spring (18) is provided in said first cylinder (15) to urge the first piston arrangement (10) into said cylinder.
- A punch assembly as claimed in claim 1 or claim 2, characterised in that said first and second cylinders (15,28) are formed in the same cylinder block (13).
- A punch assembly as claimed in any one of the preceding claims, characterised in that the axes of said first and second cylinders (15,28) are mutually perpendicular.
- A punch assembly as claimed in any one of the preceding claims, characterised in that the diameters of said first and second cylinders (15,28) are unequal.
- A press tool for shaping sheet metal having a profiled fixed member on which the workpiece to be shaped is supportable and a correspondingly shaped member movable towards said fixed member to shape the workpiece and including also a punch assembly for further forming the workpiece by deforming it in a direction angularly displaced from the direction of movement of said movable member, said punch assembly including a first piston arrangement (10) mounted in a first cylinder (15), a second piston arrangement (20) mounted in a second cylinder (28), fluid connection means (30) between said first and second cylinders (15,28) and mounting means (13) adapted for mounting said assembly on said fixed member of the pressing tool with the second piston arrangement (20) in the path of travel of the movable member whereby movement of the movable member causes movement of said second piston arrangement (20) into its cylinder (28) and corresponding movement of the first piston (10) out of its cylinder (15) to cause said further forming of the workpiece, characterised in that the said first piston (10) is attached to a guiding member external of the cylinder and received in a guide bore in the mounting mean (13), the punch being mounted, in use, on the guiding member.
- A press tool as claimed in claim 6, characterised in that the longitudinal axis of said first cylinder (15) is perpendicular to the longitudinal axis of said second cylinder (28).
- A press tool as claimed in claim 6 or claim 7, characterised in that said first and second cylinders (15,28) are formed in the same block (13).
- A press tool as claimed in claim 6, characterised in that a plurality of first piston arrangements (15) and cylinders (10) are provided connected to a single second piston and cylinder assembly by hydraulic lines.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB868615709A GB8615709D0 (en) | 1986-06-27 | 1986-06-27 | Punches |
GB8615709 | 1986-06-27 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0251796A2 EP0251796A2 (en) | 1988-01-07 |
EP0251796A3 EP0251796A3 (en) | 1988-11-30 |
EP0251796B1 true EP0251796B1 (en) | 1992-04-29 |
Family
ID=10600189
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19870305861 Expired EP0251796B1 (en) | 1986-06-27 | 1987-07-02 | Improvements in or relating to punches and presses |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0251796B1 (en) |
DE (1) | DE3778592D1 (en) |
GB (1) | GB8615709D0 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2654037B1 (en) * | 1989-11-07 | 1994-08-05 | Renault | PRESS TOOLS WITH HYDRAULIC SLIDER CONTROL DEVICE. |
US5606910A (en) * | 1993-04-26 | 1997-03-04 | Danly Corporation | Press-driven tool module in particular press-driven cross-punching or bending unit |
DE69708242T2 (en) * | 1996-09-26 | 2002-05-02 | Simone Bordignon | Hydraulic press with automatic oil compensation |
DE19830825B4 (en) * | 1998-07-09 | 2006-10-12 | Schnupp Gmbh & Co Hydraulik Kg | forming tool |
KR100391453B1 (en) * | 2000-12-30 | 2003-07-12 | 현대자동차주식회사 | Piercing device for press system |
KR101072305B1 (en) | 2005-07-15 | 2011-10-11 | 현대자동차주식회사 | Piercing Press |
GB2464756B (en) * | 2008-10-28 | 2013-06-05 | Linval Rodney | Improvements in or relating to punches or presses |
JP6197766B2 (en) * | 2014-08-26 | 2017-09-20 | Jfeスチール株式会社 | Press mold equipment |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2112153A (en) * | 1936-05-25 | 1938-03-22 | Midwest Production Engineering | Hydraulic punch and die unit |
DE1919095C3 (en) * | 1969-04-15 | 1974-03-21 | Gabriel, Guenther, 8035 Gauting | Hydropneumatic piston-cylinder unit for exerting forces on workpieces |
FR2348051A1 (en) * | 1976-04-12 | 1977-11-10 | Polymatic Sa | Hydraulically operated sheet metal piercing tool - has intermediate chamber between pressure multiplier head and double acting piercing cylinder |
JPS6040621A (en) * | 1983-08-11 | 1985-03-04 | Nissan Motor Co Ltd | Press die |
-
1986
- 1986-06-27 GB GB868615709A patent/GB8615709D0/en active Pending
-
1987
- 1987-07-02 EP EP19870305861 patent/EP0251796B1/en not_active Expired
- 1987-07-02 DE DE8787305861T patent/DE3778592D1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE3778592D1 (en) | 1992-06-04 |
EP0251796A3 (en) | 1988-11-30 |
GB8615709D0 (en) | 1986-08-06 |
EP0251796A2 (en) | 1988-01-07 |
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