EP2160257B1 - Device for locking of dies on press brakes - Google Patents
Device for locking of dies on press brakes Download PDFInfo
- Publication number
- EP2160257B1 EP2160257B1 EP08738091A EP08738091A EP2160257B1 EP 2160257 B1 EP2160257 B1 EP 2160257B1 EP 08738091 A EP08738091 A EP 08738091A EP 08738091 A EP08738091 A EP 08738091A EP 2160257 B1 EP2160257 B1 EP 2160257B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lower beam
- clamping
- die
- clamping plate
- clamping surface
- 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.)
- Not-in-force
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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
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
- B21D5/0209—Tools therefor
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- 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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/14—Particular arrangements for handling and holding in place complete dies
Definitions
- the present invention relates to a device for locking of dies on press brakes, according to the preamble of claim 1.
- press brakes comprise a fixed lower beam on which at least one die is secured, which die has a seat normally defined by a V-shaped notch, and an upper beam to which a punch having a lower working end is linked.
- the upper beam is vertically movable being driven by suitable hydraulic actuators between a rest position and a work position. In the rest position the upper beam keeps the punch spaced apart from the die, to enable insertion of a sheet metal to be bent. In the work position, the upper beam brings the lower end of the punch partly into the die seat, so as to bend the sheet metal positioned between said two elements. Based on the thickness of the sheet metal to be bent, as well as on the bending angle and the sheet metal material, different punches and dies are mounted on the press brake.
- plates or locking elements are used that are mounted on opposite sides of the beam and have surfaces for engagement with a die base.
- One of the locking plates is usually fastened to the beam while the other is pushed or pulled against the die base by means of hydraulic and/or pneumatic actuators. Said die base therefore remains clamped between the two plates, with possible interposition of spacer elements.
- a lower die fixing device of press brake is known from document JP 2003 191017 .
- Such device comprises a lower die supporter having a lower die supporting surface to support the lower die and a lower die abutting surface freely abutted on a rear side of the lower die is provided, a clamp lever oscillating in the longitudinal direction is provided on the front side of the lower die supporter, a holding piece facing the lower die abutting surface is provided on an upper end part of the clamp lever, a hydraulic cylinder to press a lower end part of the clamp lever is provided on the lower die supporter and the lower die placed on the lower die supporting surface is fixed thereto via the holding piece.
- the locking plates of the above described type are complex and expensive, since at the inside of same it is necessary to make the hydraulic ducts bringing the working fluid to the actuators.
- actuators of the hydraulic type has an influence not only on the cost of the whole press brake but also on the brake consumption because it is necessary to supply power to the pumps feeding the actuators.
- plates with manual clamping that are pushed or pulled against the die base exclusively by a plurality of screws which pass through the plate itself and are screwed down in the lower beam. Assembling or disassembling of plates of this type is long and arduous because the worker responsible for the press brake must operate on each screw before being able to mount or remove a die. For this reason plates with manual clamping are usually rather short and each of them is provided with few screws. In order to clamp several dies disposed in side by side relationship several plates with manual clamping are used which are aligned along the extension of the lower beam. However, disadvantageously, between one plate and the subsequent one there is a slit at which it is not possible to mount a die of reduced sizes because it could not be locked in a sufficiently safe and steady manner.
- Another aim of the invention is to propose a device for locking of dies on press brakes enabling the production cost of the press and the servicing costs for same to be maintained within limits.
- a still further aim of the invention is to provide a device at all events enabling quick mounting/dismantling of dies.
- a device for locking of dies on press brakes is identified by reference numeral 1.
- Device 1 - can be installed on a press brake, known by itself and therefore not shown, which comprises a base, a lower beam 2 installed on the base, an upper beam mounted above the lower beam 2 and suitable actuators, of the hydraulic type for example, adapted to enable vertical movement of the upper beam close to or away from the lower beam 2.
- Punches can be installed in a removable manner on the upper beam and dies 3 can be installed on the lower beam 2.
- Die 3 comprises a base 4 from which a lug 5 extends, which lug 5 at a distal end thereof has a seat 6 adapted to bend a sheet metal, in co-operation with a punch.
- Seat 6 is preferably defined by a V-shaped notch.
- only the cross-section of die 3 is shown, which die can extend along the lower beam 2 over the whole length of same or over portions of said beam. In this case, several dies 3 can be disposed in mutual side by side relationship along the extension of the lower beam 2.
- the lower beam 2 has an upper surface 7 adapted to receive, in a rest condition, a lower surface 8 of base 4 of die 3.
- the lower beam 2 further has a first clamping surface 9 transversely extending from the rest surface 7 and, preferably, forming a right angle with said rest surface 7.
- this first clamping surface 9 is not of one piece construction with the lower beam 2 but it belongs to an auxiliary plate 10 fastened to the lower beam 2 in a detachable manner, by means of screws, not shown, for example.
- Said auxiliary plate 10 can extend over the whole length of the lower beam 2 or only over a portion of same. As shown, the auxiliary plate 10 has a face 11 partly coupled to a first side face 12 of the lower beam 2. In particular, face 11 of the auxiliary plate 10 projects beyond the rest surface 7 and defines the first clamping surface 9.
- Device 1 further comprises a clamping plate 13 to be linked to the lower beam 2 on the side opposite to the first clamping surface 9 relative to the rest surface 7.
- the clamping plate 13 has a second clamping surface 14 facing the first clamping surface 9 and spaced apart therefrom, so as to delimit a seat for die 3.
- first and second clamping surfaces 9, 14 together with the rest surface 7 delimit the seat receiving base 4 of die 3.
- spacers could be interposed between the base 4 of die 3 and the first and second clamping surfaces 9, 14, if the width of said base 4 were smaller than the width of the lower beam 2.
- Said clamping plate 13 too can extend over the whole length of the lower beam 2 or only over a portion of same.
- Locking means is used for clamping die 3 between the first and second clamping surfaces 9, 14.
- opposite faces 15, 16 of base 4 of die 3 are sandwiched between the first and second clamping surfaces 9, 14.
- the locking means pushes the second clamping surface 14 against the base 4 and the latter against the auxiliary plate 10.
- This thrust generates friction forces on the opposite surfaces 15, 16 of base 4 of such a nature that they alone are able to prevent any movement of die 3 both along the longitudinal extension of the lower beam 2 and in a direction orthogonal to the rest surface 7 (vertical direction).
- the first and second clamping surfaces 9, 14 are substantially smooth and do not have any projecting part engaged in recesses formed on the die.
- the second clamping surface 14 too when it is closed on die 3, extends transversely from the rest surface 7 and preferably forms a right angle with said rest surface 7.
- the locking means comprises at least one pin 17 fastened to the lower beam 2 and extending along a direction "Y" substantially transverse to the longitudinal extension of the lower beam 2 itself ( Fig. 4 ).
- Pin 17 is inserted with a predetermined clearance into a respective hole 18 formed in the clamping plate 13, so that the clamping plate 13 is free to oscillate in a plane transverse to the longitudinal extension of the lower beam 2 ( Fig. 4 ).
- device 1 comprises a plurality of pins 17 inserted into respective holes 18 formed in the clamping plate 13 and disposed along the longitudinal extension "X" of the clamping plate 13 itself ( Fig. 2 ).
- pins 17 are screws provided with heads 19 and screwed down in the lower beam 2 with their axes "Y" substantially perpendicular to a second side face 20 of said lower beam 2.
- Holes 18 pass through the thickness of the clamping plate 13 and have axes substantially perpendicular to the clamping surface 14. Said hole/holes further has/have portions of different diameters so as to form an annular abutment 21 interfering with head 19, in order to retain the clamping plate 13.
- the portion of greater diameter houses head 19 of screw 17 and the portion of smaller diameter houses the shank.
- the diameter of holes 18 is slightly greater than that of screws 17 (both at the shank and at the head) and the annular abutment 21 of screws 17 is not pushed against the clamping plate 13. Therefore, the clamping plate 13 is free to slightly oscillate around an ideal axis "Z" (shown in Fig. 4 ) passing through the screws 17, also in a plane substantially perpendicular to its longitudinal extension "X".
- Spring means 22 is interposed between the clamping plate 13 and lower beam 2 and is located at an end 23 of the clamping plate 13 opposite to the second clamping surface 14 relative to pin 17.
- the spring means 22 pushes this end 23 away from the lower beam 2 (arrow A in Fig. 5 ) and, through rotation of the clamping plate 13 around the ideal axis "Z", pushes the second clamping surface 14 towards the first clamping surface 9 and towards die 3 (arrow B in Fig. 5 ).
- the spring means 22 comprises at least one spring 24 having a first end 24a in abutment against the clamping plate 13 and a second end 24b in abutment against the lower beam 2.
- Spring 24 works in compression and therefore exerts pressure against both the clamping plate 13 and the lower beam 2.
- spring 24 is of the helical type and is substantially contained in a housing 25 formed in the clamping plate 13.
- the clamping plate 13 has a plurality of housings 25 arranged along its longitudinal extension ( Fig. 3 ). Housings 25 are blind holes opening onto a face 26 of the clamping plate 13 facing beam 2. The second end 24b of spring 24 projects from face 26 of the clamping plate 13 to abut against the second side face 20 of the lower beam 2 ( Fig. 5 ).
- a protrusion 27 is present on face 26 of the clamping plate 13 and it carries the second clamping surface 14 which extends along an upper edge of the plate 13 itself. Therefore, while springs 24 push the second clamping surface 14 against die 3, the remaining surface 26 keeps slightly spaced apart from the lower beam 2 ( Fig. 5 ).
- An insert 28 is introduced into protrusion 27 and defines part of the second clamping surface 14.
- This insert 28 is made of a softer material than that of die 3 and is preferably made of plastic material.
- the insert allows damage of die 3 to be avoided and ensures coupling thereto with high friction.
- this insert adapts itself to possible unevennesses of the die surface. Insert 28, as shown in Fig. 3 , preferably extends along the whole length of the clamping plate 13.
- device 1 further comprises means 29 capable of moving the second clamping surface 14 away from die 3 against the action of the spring means 22, i.e. causing rotation of plate 13 around the ideal axis "Z".
- this means 29 comprises at least one dowel 30 ( Fig. 6 ) inserted in a threaded through hole formed in the clamping plate 13 and located close to the second clamping surface 14.
- Dowel 30 has a first end 32 suitable for abutment against the lower beam 2 and a second end 33 operable by means of a tool or provided with a lever for example (not shown), adapted to rotate dowel 30.
- a single dowel 30 is present and it is inserted in a hole 31 formed at an intermediate point of the clamping plate 13.
- die 3 can be slipped off upwards or it is removed by causing its sliding along the beam, and then replaced.
- a new die 3 is introduced between the first and second clamping surfaces 9, 14 (from top or causing sliding of same along the lower beam) and dowel 30 is unscrewed so that the first end 32 is retracted and the second clamping surface 14 is brought back against base 4 of the new die 3.
- the present invention reaches the intended purposes and achieves important advantages.
- the device of the invention is of simple and cheap structure. In fact, it is an exclusively mechanical device, surely simpler and cheaper than known hydraulic and/or pneumatic devices. As a result, maintenance costs are reduced too.
- the device ensures excellent clamping also of 10, 15 and 20 mm long pieces that, as known, cannot be forcibly clamped by traditional systems.
- clamping plates of important length can be made, because in any case with a single movement (a rotation of a 3/4 revolution of the fastening dowel at most) it is possible to lock/unlock the die itself. On the contrary, in traditional hand systems, it may happen that eight screws are to be loosened or tightened, the die length being the same.
Abstract
Description
- The present invention relates to a device for locking of dies on press brakes, according to the preamble of
claim 1. - It is known that press brakes comprise a fixed lower beam on which at least one die is secured, which die has a seat normally defined by a V-shaped notch, and an upper beam to which a punch having a lower working end is linked. The upper beam is vertically movable being driven by suitable hydraulic actuators between a rest position and a work position. In the rest position the upper beam keeps the punch spaced apart from the die, to enable insertion of a sheet metal to be bent. In the work position, the upper beam brings the lower end of the punch partly into the die seat, so as to bend the sheet metal positioned between said two elements. Based on the thickness of the sheet metal to be bent, as well as on the bending angle and the sheet metal material, different punches and dies are mounted on the press brake.
- In particular, it is known that for linking the die to the lower beam, plates or locking elements are used that are mounted on opposite sides of the beam and have surfaces for engagement with a die base. One of the locking plates is usually fastened to the beam while the other is pushed or pulled against the die base by means of hydraulic and/or pneumatic actuators. Said die base therefore remains clamped between the two plates, with possible interposition of spacer elements.
- A lower die fixing device of press brake is known from document
JP 2003 191017 - The locking plates of the above described type are complex and expensive, since at the inside of same it is necessary to make the hydraulic ducts bringing the working fluid to the actuators.
- In addition, this cost is high because usually employment of several plates sequentially arranged along the lower beam extension is required, so as to clamp the dies mutually aligned on the beam itself.
- Furthermore, use of actuators of the hydraulic type has an influence not only on the cost of the whole press brake but also on the brake consumption because it is necessary to supply power to the pumps feeding the actuators.
- It is also possible that, after a great number of mounting and dismantling cycles of the dies, overhauling is required for plates and actuators because for instance starting of losses in the hydraulic and/or pneumatic circuit may occur.
- Also known are locking plates with manual clamping, that are pushed or pulled against the die base exclusively by a plurality of screws which pass through the plate itself and are screwed down in the lower beam. Assembling or disassembling of plates of this type is long and arduous because the worker responsible for the press brake must operate on each screw before being able to mount or remove a die. For this reason plates with manual clamping are usually rather short and each of them is provided with few screws. In order to clamp several dies disposed in side by side relationship several plates with manual clamping are used which are aligned along the extension of the lower beam. However, disadvantageously, between one plate and the subsequent one there is a slit at which it is not possible to mount a die of reduced sizes because it could not be locked in a sufficiently safe and steady manner.
- Accordingly, it is an object of the present invention to provide a device for locking of dies on press brakes enabling the problems of the known art to be solved.
- It is a particular aim of the invention to propose a device for locking of dies on press brakes that is simple and cheap.
- Another aim of the invention is to propose a device for locking of dies on press brakes enabling the production cost of the press and the servicing costs for same to be maintained within limits.
- It is a further aim of the invention to propose a device for locking of dies on press brakes capable of reducing energy consumption as compared with known presses.
- A still further aim of the invention is to provide a device at all events enabling quick mounting/dismantling of dies.
- Finally, it is an aim of the present invention to propose a device for locking of dies on press brakes that can be installed on already existing presses.
- The foregoing and still further aims are achieved by a device for locking of dies on press brakes comprising the features set out in
claim 1. Dependent claims 2 to 10 define preferred embodiments of the device according to the invention. A press brake comprising a device for locking of dies according to the invention is defined inclaim 11. - Description of a device for locking of dies on press brakes in accordance with the present invention is now given, by way of an example, with reference to the accompanying drawings, in which:
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Fig. 1 is a side view of a device for locking of dies on press brakes according to a preferred embodiment of the present invention; -
Fig. 2 is a front view of an element of the device seen inFig. 1 ; -
Fig. 3 is a rear view of the element inFig. 2 ; -
Fig. 4 shows the device inFig. 1 with the element seen inFig. 2 sectioned along line IV-IV; -
Fig. 5 shows the device seen inFig. 1 with the element inFig. 3 sectioned along line V-V; -
Fig. 6 shows the element seen inFig. 2 sectioned along line VI-VI. - With reference to the drawings, a device for locking of dies on press brakes according to a preferred embodiment of the present invention is identified by
reference numeral 1. - Device 1 -can be installed on a press brake, known by itself and therefore not shown, which comprises a base, a
lower beam 2 installed on the base, an upper beam mounted above thelower beam 2 and suitable actuators, of the hydraulic type for example, adapted to enable vertical movement of the upper beam close to or away from thelower beam 2. Punches can be installed in a removable manner on the upper beam anddies 3 can be installed on thelower beam 2. - Die 3 comprises a
base 4 from which alug 5 extends, which lug 5 at a distal end thereof has aseat 6 adapted to bend a sheet metal, in co-operation with a punch. Seat 6 is preferably defined by a V-shaped notch. In the attached drawings, only the cross-section of die 3 is shown, which die can extend along thelower beam 2 over the whole length of same or over portions of said beam. In this case,several dies 3 can be disposed in mutual side by side relationship along the extension of thelower beam 2. - The
lower beam 2 has anupper surface 7 adapted to receive, in a rest condition, a lower surface 8 ofbase 4 of die 3. Thelower beam 2 further has afirst clamping surface 9 transversely extending from therest surface 7 and, preferably, forming a right angle with saidrest surface 7. - Preferably, this
first clamping surface 9 is not of one piece construction with thelower beam 2 but it belongs to anauxiliary plate 10 fastened to thelower beam 2 in a detachable manner, by means of screws, not shown, for example. - Said
auxiliary plate 10 can extend over the whole length of thelower beam 2 or only over a portion of same. As shown, theauxiliary plate 10 has aface 11 partly coupled to afirst side face 12 of thelower beam 2. In particular,face 11 of theauxiliary plate 10 projects beyond therest surface 7 and defines thefirst clamping surface 9. -
Device 1 further comprises aclamping plate 13 to be linked to thelower beam 2 on the side opposite to thefirst clamping surface 9 relative to therest surface 7. Theclamping plate 13 has asecond clamping surface 14 facing thefirst clamping surface 9 and spaced apart therefrom, so as to delimit a seat for die 3. - In more detail, the first and
second clamping surfaces rest surface 7 delimit the seat receivingbase 4 of die 3. - Possibly, spacers could be interposed between the
base 4 of die 3 and the first andsecond clamping surfaces said base 4 were smaller than the width of thelower beam 2. - Said
clamping plate 13 too can extend over the whole length of thelower beam 2 or only over a portion of same. - Locking means is used for clamping die 3 between the first and
second clamping surfaces opposite faces base 4 of die 3 are sandwiched between the first andsecond clamping surfaces - Preferably, the locking means pushes the
second clamping surface 14 against thebase 4 and the latter against theauxiliary plate 10. This thrust generates friction forces on theopposite surfaces base 4 of such a nature that they alone are able to prevent any movement of die 3 both along the longitudinal extension of thelower beam 2 and in a direction orthogonal to the rest surface 7 (vertical direction). In fact, the first andsecond clamping surfaces - The
second clamping surface 14 too, when it is closed on die 3, extends transversely from therest surface 7 and preferably forms a right angle with saidrest surface 7. - The locking means comprises at least one
pin 17 fastened to thelower beam 2 and extending along a direction "Y" substantially transverse to the longitudinal extension of thelower beam 2 itself (Fig. 4 ). -
Pin 17 is inserted with a predetermined clearance into arespective hole 18 formed in theclamping plate 13, so that theclamping plate 13 is free to oscillate in a plane transverse to the longitudinal extension of the lower beam 2 (Fig. 4 ). - As can be viewed,
device 1 comprises a plurality ofpins 17 inserted intorespective holes 18 formed in theclamping plate 13 and disposed along the longitudinal extension "X" of theclamping plate 13 itself (Fig. 2 ). - In particular,
pins 17 are screws provided withheads 19 and screwed down in thelower beam 2 with their axes "Y" substantially perpendicular to asecond side face 20 of saidlower beam 2. -
Holes 18 pass through the thickness of theclamping plate 13 and have axes substantially perpendicular to theclamping surface 14. Said hole/holes further has/have portions of different diameters so as to form anannular abutment 21 interfering withhead 19, in order to retain the clampingplate 13. The portion of greater diameter houses head 19 ofscrew 17 and the portion of smaller diameter houses the shank. - The diameter of
holes 18 is slightly greater than that of screws 17 (both at the shank and at the head) and theannular abutment 21 ofscrews 17 is not pushed against the clampingplate 13. Therefore, the clampingplate 13 is free to slightly oscillate around an ideal axis "Z" (shown inFig. 4 ) passing through thescrews 17, also in a plane substantially perpendicular to its longitudinal extension "X". - Spring means 22 is interposed between the clamping
plate 13 andlower beam 2 and is located at anend 23 of the clampingplate 13 opposite to thesecond clamping surface 14 relative to pin 17. The spring means 22 pushes thisend 23 away from the lower beam 2 (arrow A inFig. 5 ) and, through rotation of the clampingplate 13 around the ideal axis "Z", pushes thesecond clamping surface 14 towards thefirst clamping surface 9 and towards die 3 (arrow B inFig. 5 ). - Preferably, the spring means 22 comprises at least one
spring 24 having a first end 24a in abutment against the clampingplate 13 and asecond end 24b in abutment against thelower beam 2.Spring 24 works in compression and therefore exerts pressure against both the clampingplate 13 and thelower beam 2. - In the preferred embodiment herein shown,
spring 24 is of the helical type and is substantially contained in ahousing 25 formed in the clampingplate 13. In particular, the clampingplate 13 has a plurality ofhousings 25 arranged along its longitudinal extension (Fig. 3 ).Housings 25 are blind holes opening onto aface 26 of the clampingplate 13 facingbeam 2. Thesecond end 24b ofspring 24 projects fromface 26 of the clampingplate 13 to abut against thesecond side face 20 of the lower beam 2 (Fig. 5 ). - A
protrusion 27 is present onface 26 of the clampingplate 13 and it carries thesecond clamping surface 14 which extends along an upper edge of theplate 13 itself. Therefore, whilesprings 24 push thesecond clamping surface 14 againstdie 3, the remainingsurface 26 keeps slightly spaced apart from the lower beam 2 (Fig. 5 ). - An
insert 28 is introduced intoprotrusion 27 and defines part of thesecond clamping surface 14. Thisinsert 28 is made of a softer material than that ofdie 3 and is preferably made of plastic material. The insert allows damage ofdie 3 to be avoided and ensures coupling thereto with high friction. In addition, this insert adapts itself to possible unevennesses of the die surface.Insert 28, as shown inFig. 3 , preferably extends along the whole length of the clampingplate 13. - To remove die 3 from the
lower beam 2 and install another die,device 1 further comprises means 29 capable of moving thesecond clamping surface 14 away fromdie 3 against the action of the spring means 22, i.e. causing rotation ofplate 13 around the ideal axis "Z". - Preferably this means 29 comprises at least one dowel 30 (
Fig. 6 ) inserted in a threaded through hole formed in the clampingplate 13 and located close to thesecond clamping surface 14.Dowel 30 has afirst end 32 suitable for abutment against thelower beam 2 and asecond end 33 operable by means of a tool or provided with a lever for example (not shown), adapted to rotatedowel 30. Preferably asingle dowel 30 is present and it is inserted in ahole 31 formed at an intermediate point of the clampingplate 13. - By screwing
dowel 30 inhole 31, thefirst end 32 is brought to project beyondface 26 ofplate 13, so as to move thissecond clamping surface 14 away frombase 4 ofdie 3. After this operation, die 3 can be slipped off upwards or it is removed by causing its sliding along the beam, and then replaced. - A
new die 3 is introduced between the first and second clamping surfaces 9, 14 (from top or causing sliding of same along the lower beam) anddowel 30 is unscrewed so that thefirst end 32 is retracted and thesecond clamping surface 14 is brought back againstbase 4 of thenew die 3. - The present invention reaches the intended purposes and achieves important advantages.
- The device of the invention is of simple and cheap structure. In fact, it is an exclusively mechanical device, surely simpler and cheaper than known hydraulic and/or pneumatic devices. As a result, maintenance costs are reduced too.
- In addition, it is possible to apply this device substantially to any press without modifying it.
- By virtue of the insert of plastic material and the even distribution of the clamping springs, the device ensures excellent clamping also of 10, 15 and 20 mm long pieces that, as known, cannot be forcibly clamped by traditional systems.
- Unlike some known systems, it is possible to cause insertion of the die on the lower beam either vertically or by making it slide horizontally.
- In addition, clamping plates of important length (typically 835 mm) can be made, because in any case with a single movement (a rotation of a 3/4 revolution of the fastening dowel at most) it is possible to lock/unlock the die itself. On the contrary, in traditional hand systems, it may happen that eight screws are to be loosened or tightened, the die length being the same.
Claims (11)
- A device for locking of dies on press brakes, comprising:- a clamping plate (13 ) to be linked to a lower beam (2) of a press brake; said lower beam (2) having a rest surface (7) for a die (3) and a first clamping surface (9) extending in a transverse direction from the rest surface (7); the clamping plate (13) being able to be linked to the lower beam (2) on the side opposite to the first clamping surface (9) relative to the rest surface (7) and having a second clamping surface (14) facing the first clamping surface (9) so as to delimit a seat for the die (3);- locking means for clamping the die (3) between the first and second clamping surfaces (9, 14);
wherein the locking means comprises:- at least one pin (17) fastened to the lower beam (2) and extending along a direction substantially transverse to the longitudinal extension of said lower beam (2); said at least one pin (17) being inserted, with a predetermined clearance, in a respective hole (18) formed in the clamping plate (13), in such a manner that the clamping plate (13) is free to oscillate in a plane transverse to the longitudinal extension of the lower beam (2);charaterised in that the locking means further comprises:- spring means (22) interposed between the clamping plate (13) and the lower beam (2) and located at an end (23) of the clamping plate (13) opposite to the second clamping surface (14) relative to said at least one pin (17), to push said end (23) away from the lower beam (2) and push the second clamping surface (14) towards the first clamping surface (9) and the die (3); wherein the spring means (22) comprises at least one spring (24) having an end (24a) in abutment against the clamping plate (13) and an opposite end (24b) in abutment against the lower beam (2); and characterised in that the device further comprises means for moving the second clamping surface (14) away from the die (3) against the action of the spring weans (22) and allowing removal of said die (3). - A device as claimed in claim 1, further comprising an insert (28) defining part of the second clamping surface (14) and made of a softer material than that of the die (3).
- A device as claimed in claim 1, wherein locking of the die (3) in a direction orthogonal to the rest surface (7) is only ensured by friction of said die (3) with the first or the second clamping surface (9, 14).
- A device as claimed in claim 1 or 3, wherein the spring means (22) is substantially contained in a housing (25) formed in the clamping plate (13).
- A device as claimed in claim 1, wherein said at least one pin (17) is a screw, screwed down in the lower beam (2) and having a head (19) adapted to retain the clamping plate (13).
- A device as claimed in claim 1, wherein the means for moving the second clamping surface (14) away comprises at least one dowel (30) inserted in a hole (31) formed in the clamping plate (13) in the vicinity of the second clamping surface (14); said dowel (30) having an end (32) suitable for abutment against the lower beam (2).
- A device as claimed in claim 1, comprising a plurality of pins (17) inserted in respective holes (18) evenly distributed along the longitudinal extension of the clamping plate (13).
- A device as claimed in claim 4, wherein the clamping plate (13) has a plurality of housings (25), for respective springs (24), evenly distributed along the longitudinal extension of said clamping plate (13).
- A device as claimed in claim 6, wherein the means for moving the second clamping surface (14) away comprises a single dowel (30) inserted in a hole (31) formed in an intermediate point of the clamping plate (13).
- A device as claimed in claim 1, further comprising an auxiliary plate (10) that can be fastened to the lower beam (3) and carries the first clamping surface (9).
- A press brake comprising a base, a lower beam (2) fastened to the base and supporting at least one die (3), an upper beam movable close to or away from the lower beam and supporting at least one punch, actuators for moving the upper beam relative to the lower beam (2); characterised in that it comprises a device (1) for locking of dies on press brakes as claimed at least in one of claims 1 to 10.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT001174A ITMI20071174A1 (en) | 2007-06-11 | 2007-06-11 | DEVICE FOR LOCKING DIES ON BENDING PRESSES |
PCT/IB2008/051783 WO2008152536A2 (en) | 2007-06-11 | 2008-05-07 | Device for locking of dies on press brakes |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2160257A2 EP2160257A2 (en) | 2010-03-10 |
EP2160257B1 true EP2160257B1 (en) | 2010-11-24 |
Family
ID=40086429
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08738091A Not-in-force EP2160257B1 (en) | 2007-06-11 | 2008-05-07 | Device for locking of dies on press brakes |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2160257B1 (en) |
AT (1) | ATE489180T1 (en) |
DE (1) | DE602008003689D1 (en) |
IT (1) | ITMI20071174A1 (en) |
WO (1) | WO2008152536A2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114778058B (en) * | 2022-06-20 | 2022-09-02 | 中国飞机强度研究所 | Control method of gas circuit system of secondary air cannon for high-speed impact test of airplane structure |
CN116060518B (en) * | 2023-03-20 | 2023-06-16 | 厦门海普锐科技股份有限公司 | Locking device of bending die |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4612796A (en) * | 1984-03-15 | 1986-09-23 | Cincinnati Incorporated | Hydraulically actuated tooling clamps for the ram and bed of a press brake and the like |
US6119503A (en) * | 1999-04-02 | 2000-09-19 | Wilson Tool International, Inc. | Universal die holder assembly for press brakes |
JP2001030010A (en) * | 1999-07-22 | 2001-02-06 | Amada Co Ltd | Die holder |
JP3495335B2 (en) * | 2001-01-22 | 2004-02-09 | 株式会社アマダ | Mold support device |
JP2003191017A (en) * | 2001-10-15 | 2003-07-08 | Amada Co Ltd | Lower die fixing device of press brake |
DE60201169T2 (en) * | 2002-03-08 | 2005-11-17 | Cornelis Hendricus Liet | Device for bending a metal sheet |
JP4233921B2 (en) * | 2003-05-21 | 2009-03-04 | 株式会社アマダ | Mold fixing device |
-
2007
- 2007-06-11 IT IT001174A patent/ITMI20071174A1/en unknown
-
2008
- 2008-05-07 AT AT08738091T patent/ATE489180T1/en not_active IP Right Cessation
- 2008-05-07 WO PCT/IB2008/051783 patent/WO2008152536A2/en active Application Filing
- 2008-05-07 DE DE602008003689T patent/DE602008003689D1/en active Active
- 2008-05-07 EP EP08738091A patent/EP2160257B1/en not_active Not-in-force
Also Published As
Publication number | Publication date |
---|---|
DE602008003689D1 (en) | 2011-01-05 |
EP2160257A2 (en) | 2010-03-10 |
WO2008152536A3 (en) | 2009-02-26 |
WO2008152536A2 (en) | 2008-12-18 |
ATE489180T1 (en) | 2010-12-15 |
ITMI20071174A1 (en) | 2008-12-12 |
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