EP0610706A1 - Improvement in a plate bending process and related machine - Google Patents
Improvement in a plate bending process and related machine Download PDFInfo
- Publication number
- EP0610706A1 EP0610706A1 EP94100971A EP94100971A EP0610706A1 EP 0610706 A1 EP0610706 A1 EP 0610706A1 EP 94100971 A EP94100971 A EP 94100971A EP 94100971 A EP94100971 A EP 94100971A EP 0610706 A1 EP0610706 A1 EP 0610706A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- knife
- bending
- piston
- blank
- holder
- 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.)
- Granted
Links
- 238000005452 bending Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000008569 process Effects 0.000 title claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract 2
- 239000002184 metal Substances 0.000 claims description 35
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims 2
- 238000005516 engineering process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
Images
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
- B21D5/04—Bending sheet metal along straight lines, e.g. to form simple curves on brakes making use of clamping means on one side of the work
- B21D5/045—With a wiping movement of the bending blade
-
- 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
- B21D5/04—Bending sheet metal along straight lines, e.g. to form simple curves on brakes making use of clamping means on one side of the work
- B21D5/042—With a rotational movement of the bending blade
Definitions
- This invention relates to a new sheet-metal bending process for metal plates, in particular to make bends with a greater angle than 90° in the butt-end or edge portion of sheet-metal plates with an elongated shape, as performed preferably by numerical-control (NC) presses, as well as the machines arranged to carry out such a process.
- NC numerical-control
- Press-bending is a widely known technology in the sheet-metal forming industry, where it is used in much the same manner by the various manufacturers, except for some minor differences due mainly to various extents of automation implemented in the respective manufacturing processes.
- Such a technology is substantially based on the following fabrication cycle, which is briefly outlined below in order to facilitate a comparison with the cycle according to the present invention, which will be described further on.
- the sheet-metal bending process is carried out in two distinct phases, which consist in Placing the sheet-metal plate to be folded on an appropriate anvil, which is generally known in the art by its name of 'dihedron' and is accordingly provided with an angled concavity, and in the downstroke of a plunger carrying, duly attached to its downward facing end, an appropriately shaped tool, which is generally known in the art by its name of 'knife'.
- the process according to the present invention is based essentially on the fact that the bending operation is performed in three distinct phases, wherein a blank-holder is lowered in the first phase, by means of an appropriate motor-driven piston, on to the plate to be bent so as to keep it firmly between said blank-holder and an appropriate anvil , wherein in the second phase the continuation of said downward displacement of the piston that caused the blank-holder to go down causes a knife to be pushed downward, the lower end of said knife abutting then against the sheet-metal plate to be bent and causing it to therefore rotate around an appropriate edge of said anvil so as to cause said plate to undergo a first 90°-bending, and wherein in the third phase she continued downward movement of said piston forces the rotation of said knife so that one of its ends presses on the bent side of the sheet-metal plate, thereby causing it to further bend around the corresponding inclined and reentrant edge of the anvil , as this is apparent from the illustrations in the Figures and the following description of the machine.
- the body of the piston 3 is raised and, therefore, both the spring 5 of the blank-holder 4, arranged between said blank-holder and the piston 3, and the spring 14 contrasting the knife 11, arranged between the lever 11a of said knife and the piston 3, are extended, ie. relaxed, since they work as compression springs.
- the knife 11 and its actuation lever 11a are connected with the piston 3 through the rod 10 that is fixedly provided on said piston, said rod being the force transmitting element that actually causes said knife and said lever to rotate with respect to the piston 3.
- the thrust pin 6 which is firmly associated with the blank-holder on its upper portion, lies at the bottom end of its stroke with respect to the piston 3, the blank-holder 4 lies in a raised position with respect to the sheet-metal plate 1, while the knife 11, which is at rest, lies in a substantially vertical position, rotated to its clockwise uttermost position, due to the action of the spring 14 that pushes the actuation lever 11a against an appropriate abutment (not shown) situated on the piston 3.
- the lower end 12 of said knife 11 is separated from the sheet-metal plate by a distance which is greater than the distance separating the same plate from the lower surface of the blank-holder 4.
- the thrust generating and transmitting piston 3 continuing in its downward displacement, pushes through the rod 10 the knife 11 further downward, so that the lower end 12 of said knife 11 is now able to push, and bend by a 90°-angle in an anti-clockwise direction, the edge portion 1a of the sheet-metal plate protruding from the anvil 2.
- said terminal tip of the knife imparts an anti-clockwise rotary thrust to the same edge portion in such a way that said edge portion (1b) of the plate undergoes further bending about the edge of the anvil toward the reentrant inclined edge 15, however without touching the latter, and takes therefore the desired inclination which, apart from the sizing of the various afore described components, will also depend on the particular sequencing of the various actuators and movements of the machine, as made possible by the numerical-control technology.
- This process in conjunction with the described machine, enable following further advantages to be achieved: simpler bending process, shorter bending times, use of a single anvil for a greater number of inclination or bending angles, easier programming of the whole machine by using the possibilities offered in this connection by the numerical-control technology, simpler and easier implementation of the process, greater operational safety and reliability.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
- Treatment Of Fiber Materials (AREA)
Abstract
Description
- This invention relates to a new sheet-metal bending process for metal plates, in particular to make bends with a greater angle than 90° in the butt-end or edge portion of sheet-metal plates with an elongated shape, as performed preferably by numerical-control (NC) presses, as well as the machines arranged to carry out such a process.
- Press-bending is a widely known technology in the sheet-metal forming industry, where it is used in much the same manner by the various manufacturers, except for some minor differences due mainly to various extents of automation implemented in the respective manufacturing processes.
- Such a technology is substantially based on the following fabrication cycle, which is briefly outlined below in order to facilitate a comparison with the cycle according to the present invention, which will be described further on.
- Essentially, the sheet-metal bending process is carried out in two distinct phases, which consist in Placing the sheet-metal plate to be folded on an appropriate anvil, which is generally known in the art by its name of 'dihedron' and is accordingly provided with an angled concavity, and in the downstroke of a plunger carrying, duly attached to its downward facing end, an appropriately shaped tool, which is generally known in the art by its name of 'knife'.
- In general, such an angled concavity of the dihedron and the knife are given such a shape that they are capable of fitting together perfectly.
- The progressively applied pressure of the knife against the sheet-metal plate, whereas the dihedron acts as an opposing and forming element, brings about the desired bending and plastic deformation effect in the sheet-metal plate while the latter is clamped by said elements, as anyone skilled in the art is well aware of. However, the use of this technique is limited to the bending of sheet-metal plates being quite small in their size. Actually, the following rule-of-thumb applies in general: the greater the bending angle, the smaller the size of the sheet-metal plate.
- The problems, therefore, arise when handling larger-sized sheet-metal plates and, particularly, when the need arises to bend beyond 90°, ie. creating 'undercuts', the butt-end or edge portions of elongated-shape sheet-metal plates, preferably by means of a single sheet-metal bending operation.
- Actually, it is theoretically possible to bend by such a large angle the butt-end or edge portion of a sheet-metal plate with a single sheet-metal bending operation. This, however, would require that the plate is not clamped in the process, but on the contrary stays free, and this would in turn bring about a number of undesired consequences. As a matter of fact, in such a case the penetration of the knife in the dihedron and the resulting deformation of the sheet-metal plate placed therebetween would cause the 'length' portion of the same plate, ie. the portion which is not actually involved by the bending process, to be rotated by an angle corresponding to the desired inclination of the bend.
- This has a number of unavoidable drawbacks as a consequence: on one hand, a great amount of raising motion by the rotation of the sheet-metal plate due to the sheet-metal bending operation is in general considered to be unacceptable owing to the really huge space requirements that this would imply, also in connection with the safety areas to be arranged therearound. On the other hand, if the sheet-metal plate is rather long, its raising may cause the plate to sag near the bending line owing to the flexural or bending load imposed by the weight of the raised portion of the sheet-metal plate. In practice, it is therefore not possible to obtain, by a single sheet-metal bending operation, the formation of a butt-end or edge bend in a sheet-metal plate with large bending angles, in particular with bending angles larger than 90° or undercuts, while keeping the plate in its horizontal position.
- Furthermore, for each shape of butt-end bend to be made a special set of tools needs to be employed, ie. a special knife and a corresponding dihedron. This, of course, brings about considerable costs owing to both the number of tool sets needed and their replacement, or setup, at each model change in production.
- It therefore would be desirable, and it is actually a scope of the present invention, to provide a sheet-metal bending process which is able to eliminate all of the afore cited drawbacks and, in particular, to enable the length portion of the sheet-metal plate to be kept constantly on its horizontal plane , and which is reliable, cost-effective, easily implemented through the use of currently available techniques and equipment, as well as to provide a machine which is capable of performing said process.
- In order that the present invention may more readily be understood, the following description is given, merely by way of non-limiting example, reference being made to the accompanying drawings in which:
- Figure 1 is a schematical view of a machine according to the present invention in its starting position;
- Figures 2, 3, 4 and 5 are views showing four subsequent operating positions of the machine according to the present invention.
- The process according to the present invention is based essentially on the fact that the bending operation is performed in three distinct phases, wherein a blank-holder is lowered in the first phase, by means of an appropriate motor-driven piston, on to the plate to be bent so as to keep it firmly between said blank-holder and an appropriate anvil , wherein in the second phase the continuation of said downward displacement of the piston that caused the blank-holder to go down causes a knife to be pushed downward, the lower end of said knife abutting then against the sheet-metal plate to be bent and causing it to therefore rotate around an appropriate edge of said anvil so as to cause said plate to undergo a first 90°-bending, and wherein in the third phase she continued downward movement of said piston forces the rotation of said knife so that one of its ends presses on the bent side of the sheet-metal plate, thereby causing it to further bend around the corresponding inclined and reentrant edge of the anvil , as this is apparent from the illustrations in the Figures and the following description of the machine.
- Referring now to the accompanying Figures, these are seen to illustrate a machine comprising following elements:
- 1 ·
- Sheet-metal plate to be bent
- 1a ·
- Edge portion of the plate bent by a 90°-angle
- 1b ·
- Edge portion of the plate bent by a greater angle than 90°
- 2 ·
- Anvil or dihedron
- 3 ·
- Thrust generating and transmitting piston
- 4 ·
- Blank-holder
- 5 ·
- Spring transmitting pressure from
piston 3 toblank holder 4 - 6 ·
- Thrust pin acting on
knife 11 - 7 ·
- Head of said
pin 6 - 8 ·
- Abutment of the
head 7 of thepin 6 against thelever 11a - 9 ·
- Travel path of the
pin 6 - 10 ·
- Rotation rod of
knife 11 - 11 ·
- Knife for bending
edge portion 1a, 1b ofplate 1 - 11a ·
- Actuating lever for
knife 11 - 12 ·
- Lower operating end of
knife 11 - 13 ·
- Terminal bending tip of
knife 11 - 14 ·
- Spring contrasting rotation of
knife 11 - 15 .
- Lower re-entrant edge of
anvil 2. - All these elements are interconnected and operate as follows:
At the beginning of the process (Fig. 1), the sheet-metal plate 1 is laid upon theanvil 2. The blank-holder 4 and thepiston 3 are separated by a free space of mutual displacement and are connected by aspring 5 and apin 6 whose purpose, operation and peculiarities will be further explained later on. - The body of the
piston 3 is raised and, therefore, both thespring 5 of the blank-holder 4, arranged between said blank-holder and thepiston 3, and thespring 14 contrasting theknife 11, arranged between thelever 11a of said knife and thepiston 3, are extended, ie. relaxed, since they work as compression springs. Theknife 11 and itsactuation lever 11a are connected with thepiston 3 through therod 10 that is fixedly provided on said piston, said rod being the force transmitting element that actually causes said knife and said lever to rotate with respect to thepiston 3. - The
thrust pin 6 , which is firmly associated with the blank-holder on its upper portion, lies at the bottom end of its stroke with respect to thepiston 3, the blank-holder 4 lies in a raised position with respect to the sheet-metal plate 1, while theknife 11, which is at rest, lies in a substantially vertical position, rotated to its clockwise uttermost position, due to the action of thespring 14 that pushes theactuation lever 11a against an appropriate abutment (not shown) situated on thepiston 3. Thelower end 12 of saidknife 11 is separated from the sheet-metal plate by a distance which is greater than the distance separating the same plate from the lower surface of the blank-holder 4. - In the next phase of the process (Fig. 2), the thrust generating and transmitting
piston 3 is lowered until the blank-holder 4 is enabled to come into contact with the sheet-metal plate 1. All of the remaining elements of the system keep on the other hand an unchanged position with respect to each other. - By continuing its downward displacement (Fig. 3), said
piston 3 completes a further downstroke by a length that is equal to the height difference "L" between the lower surface of the blank-holder 4 and thelower end 12 of theknife 11, thereby compressing thespring 5. In this phase of the process, thelower end 12 of theknife 11, which is actuated by therod 10, goes down to come into contact with the protruding edge portion of theplate 1, however without exerting any pressure on it yet. Furthermore, thespring 14 between thelever 11a and thepiston 3 is not compressed, since it is not being loaded yet, due to thehead 7 of thepin 6 not having yet reached the abutment 8 located on the lower side of thelever 11a. - In the following phase (Fig. 4), the thrust generating and transmitting
piston 3, continuing in its downward displacement, pushes through therod 10 theknife 11 further downward, so that thelower end 12 of saidknife 11 is now able to push, and bend by a 90°-angle in an anti-clockwise direction, the edge portion 1a of the sheet-metal plate protruding from theanvil 2. - The further downward displacement of the
piston 3, as it continues its downward stroke even after the blank-holder has come down onto the sheet-metal plate and thelower end 12 of theknife 11 has come down onto the protruding edge portion of the sheet-metal plate 1, is enabled by the fact that there is a free travel space between said piston and said blank-holder, said space being partially used by thepressure transmitting spring 5, saidpressure transmitting spring 5 being guided by thecoaxial pin 5a and thepin 6. - The downstroke of the thrust generating and transmitting
piston 3 continues (Fig. 5) down to the point at which thepin 6, which is rigidly associated with the blank-holder 4, strikes with itshead 7 against the abutment 8; from this point on, the further downward movement of thepiston 3 causes thehead 7 of thepin 6 to accordingly push against said abutment 8 and this, in turn, causes thelever 11a to be pushed upward, so that the latter, which is journalled on therod 10 attached to thepiston 3, acts in turn to cause in this way theknife 11, and in particular itsterminal tip 13, to rotate in an anti-clockwise direction. - Being already in contact with the edge portion 1a of the plate which has just been bent at right angle, said terminal tip of the knife imparts an anti-clockwise rotary thrust to the same edge portion in such a way that said edge portion (1b) of the plate undergoes further bending about the edge of the anvil toward the reentrant inclined edge 15, however without touching the latter, and takes therefore the desired inclination which, apart from the sizing of the various afore described components, will also depend on the particular sequencing of the various actuators and movements of the machine, as made possible by the numerical-control technology.
- Once this last process phase is completed, the machine is restored in its initial starting condition shown in Fig. 1 by simply raising the
piston 3 so that the latter will move with it the various afore cited operating elements of the machine by performing automatically, in a reverse sequence, the various afore illustrated movements until the initial positions of said elements are fully recovered owing also to the action of thesprings - This process, in conjunction with the described machine, enable following further advantages to be achieved: simpler bending process, shorter bending times, use of a single anvil for a greater number of inclination or bending angles, easier programming of the whole machine by using the possibilities offered in this connection by the numerical-control technology, simpler and easier implementation of the process, greater operational safety and reliability.
- Anyone skilled in the art will now be in a position as to appreciate that this last operation sequence to reset the machine can be easily integrated with the afore described sequences, by simply programming in a suitable way, as anyone skilled in the art is certainly able to do, the control and actuation system of the machine.
- It will be further apparent that the above illustrated process and machine may be the subject of any modification and/or addition to accomodate any of a number of construction and/or operation variants that may be considered to be appropriate, such as for instance a construction geometry that is the inverse of the one being shown and illustrated here, or the use of springs that operate in an extension mode rather than in a compression one and that are appropriately relocated, or even an inverted arrangement of the
pin 6 which may therefore be attached to thelever 11a and operated to act on the blank-holder 4, instead of the opposite arrangement described and illustrated here by way of example, without departing from the scope of the present invention.
Claims (6)
- Process for bending a plate of press-formable material, comprising the use of a blank-holder means to firmly hold the plate on its horizontal plane between said blank-holder means and an appropriate anvil, and the subsequent actuation of a knife-shaped tool to perform the bending operation, characterized in that said actuation of said knife-shaped tool consists of a first purely translational movement and a second purely rotational movement.
- Bending process according to claim 1, characterized in that said first purely translational movement brings about a first bending by a 90°-angle of the edge portion of the plate to be bent, and that said second purely rotational movement is effective in increasing the bending angle to any greater angle than 90°.
- Machine for bending a sheet-metal plate, comprising an actuation piston (3), a knife (11), an anvil (2), a blank-holder (4) arranged on one side of the piston on the same side of the anvil, characterized in that:- said knife (11) is provided with a lever (11a) which is pivotally attached through a rod (10) to said piston (3) and is arranged in a substantially transverse way with respect to the direction of its movement, and is connected to said piston by means od a spring means (14);- said knife is provided with an extension which is substantially parallel to the movement of the piston;- said blank-holder (4) is movable with respect to the piston and is connected to the latter by means of a second spring means (5);- said blank-holder is equipped with a pin (6) protruding toward said piston and is provided with a head (7) that is capable of being displaced into a position of greatest separation from an opposite abutment (8) situated on an edge of said lever (11a) in correspondence of the position of greatest separation of the blank-holder from the piston.
- Bending machine according to claim 3, characterized in that said extension of the knife (11) is provided with an end portion (12) which is substantially flat and terminates with a tip (13) that is oriented orthogonally with respect to the plane of the anvil.
- Bending machine according to claim 4, characterized in that the maximum distance (9) covered by the pin (6) in its displacement before starting to act on the lever (11a) corresponds to the sum of the distance (L) between the level of said end portion (12) of said knife and the working surface of said blank-holder on one side, and the distance (D) that has to be covered by said end portion (12) when moving from the position in which it is just in contact with the plate (1) to the position in which said plate is bent by a 90°-angle.
- Bending machine according to claim 5, characterized in that it works in accordance with any of the preceding claims 1 to 3.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITPN930005 | 1993-02-08 | ||
IT93PN000005A IT1265553B1 (en) | 1993-02-08 | 1993-02-08 | PROCESS AND MACHINE PERFECTED BY PRESS-BENDING |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0610706A1 true EP0610706A1 (en) | 1994-08-17 |
EP0610706B1 EP0610706B1 (en) | 1996-10-09 |
Family
ID=11394744
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94100971A Expired - Lifetime EP0610706B1 (en) | 1993-02-08 | 1994-01-24 | Improvement in a plate bending process and related machine |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0610706B1 (en) |
AT (1) | ATE143839T1 (en) |
DE (1) | DE69400647T2 (en) |
ES (1) | ES2095687T3 (en) |
IT (1) | IT1265553B1 (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1584385A1 (en) * | 2004-04-06 | 2005-10-12 | Trumpf Maschinen Austria GmbH & CO. KG. | Bending tool for bending workpieces, in particular metal sheets, as well as bending machine with such a bending tool |
CN102294399A (en) * | 2011-06-30 | 2011-12-28 | 江苏科行环境工程技术有限公司 | Device for processing clamping sleeve of anode plate of electric precipitator |
CN104190757A (en) * | 2014-08-22 | 2014-12-10 | 上海元阳金属制品有限公司 | Bending machine |
CN106001271A (en) * | 2016-06-22 | 2016-10-12 | 苏州天朋精密元器件有限公司 | Bending die |
WO2018055193A1 (en) | 2016-09-26 | 2018-03-29 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Tool, machine tool, and method for machining planar workpieces |
EP3357597A1 (en) * | 2017-02-02 | 2018-08-08 | K.A. Holding Støvring ApS | Bending piston |
CN109127895A (en) * | 2017-06-15 | 2019-01-04 | 嘉意机床(上海)有限公司 | A kind of bending machine is turned over to shaping dies and method |
IT201900009657A1 (en) * | 2019-06-20 | 2020-12-20 | Dallan Spa | BENDING MACHINE FOR SHEETS AND METHOD OF BENDING SHEETS |
CN113083952A (en) * | 2021-03-18 | 2021-07-09 | 卢长寿 | High-end equipment manufacturing cold rolled steel bending equipment |
EP3932577A1 (en) * | 2020-07-03 | 2022-01-05 | Schröder Maschinenbau GmbH | Corner tool for a swivel bending machine |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108480425B (en) * | 2018-04-17 | 2019-07-09 | 张玉芙 | Full-automatic bending machine and bending method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0089904A1 (en) * | 1982-03-19 | 1983-09-28 | Alexis Pauzin | Flat bending device |
JPS5933032A (en) * | 1982-08-16 | 1984-02-22 | Hitachi Ltd | Metallic die for bending sheet |
JPS642726A (en) * | 1986-12-27 | 1989-01-06 | Maru Kikai Kogyo Kk | Bending die |
-
1993
- 1993-02-08 IT IT93PN000005A patent/IT1265553B1/en active IP Right Grant
-
1994
- 1994-01-24 ES ES94100971T patent/ES2095687T3/en not_active Expired - Lifetime
- 1994-01-24 AT AT94100971T patent/ATE143839T1/en not_active IP Right Cessation
- 1994-01-24 EP EP94100971A patent/EP0610706B1/en not_active Expired - Lifetime
- 1994-01-24 DE DE69400647T patent/DE69400647T2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0089904A1 (en) * | 1982-03-19 | 1983-09-28 | Alexis Pauzin | Flat bending device |
JPS5933032A (en) * | 1982-08-16 | 1984-02-22 | Hitachi Ltd | Metallic die for bending sheet |
JPS642726A (en) * | 1986-12-27 | 1989-01-06 | Maru Kikai Kogyo Kk | Bending die |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 13, no. 163 (M - 816) 19 April 1989 (1989-04-19) * |
PATENT ABSTRACTS OF JAPAN vol. 8, no. 132 (M - 303)<1569> 20 June 1984 (1984-06-20) * |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7237419B2 (en) | 2004-04-06 | 2007-07-03 | Trumpf Maschinen Austria Gesmvh & Co Kg | Bending machine |
EP1584385A1 (en) * | 2004-04-06 | 2005-10-12 | Trumpf Maschinen Austria GmbH & CO. KG. | Bending tool for bending workpieces, in particular metal sheets, as well as bending machine with such a bending tool |
CN102294399A (en) * | 2011-06-30 | 2011-12-28 | 江苏科行环境工程技术有限公司 | Device for processing clamping sleeve of anode plate of electric precipitator |
CN104190757A (en) * | 2014-08-22 | 2014-12-10 | 上海元阳金属制品有限公司 | Bending machine |
CN106001271A (en) * | 2016-06-22 | 2016-10-12 | 苏州天朋精密元器件有限公司 | Bending die |
CN109789466A (en) * | 2016-09-26 | 2019-05-21 | 通快机床两合公司 | Tool, lathe and method for machining plate-like workpieces |
WO2018055193A1 (en) | 2016-09-26 | 2018-03-29 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Tool, machine tool, and method for machining planar workpieces |
US11478835B2 (en) | 2016-09-26 | 2022-10-25 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Machining planar workpieces |
EP3357597A1 (en) * | 2017-02-02 | 2018-08-08 | K.A. Holding Støvring ApS | Bending piston |
CN109127895A (en) * | 2017-06-15 | 2019-01-04 | 嘉意机床(上海)有限公司 | A kind of bending machine is turned over to shaping dies and method |
IT201900009657A1 (en) * | 2019-06-20 | 2020-12-20 | Dallan Spa | BENDING MACHINE FOR SHEETS AND METHOD OF BENDING SHEETS |
EP3753645A1 (en) * | 2019-06-20 | 2020-12-23 | Dallan S.p.A. | Sheet metal bending machine and sheet metal bending method |
US11618068B2 (en) | 2019-06-20 | 2023-04-04 | Dallan S.P.A. | Sheet metal bending machine and sheet metal bending method |
EP3932577A1 (en) * | 2020-07-03 | 2022-01-05 | Schröder Maschinenbau GmbH | Corner tool for a swivel bending machine |
CN113083952A (en) * | 2021-03-18 | 2021-07-09 | 卢长寿 | High-end equipment manufacturing cold rolled steel bending equipment |
Also Published As
Publication number | Publication date |
---|---|
ATE143839T1 (en) | 1996-10-15 |
DE69400647D1 (en) | 1996-11-14 |
DE69400647T2 (en) | 1997-05-07 |
ES2095687T3 (en) | 1997-02-16 |
ITPN930005A1 (en) | 1994-08-08 |
IT1265553B1 (en) | 1996-11-22 |
EP0610706B1 (en) | 1996-10-09 |
ITPN930005A0 (en) | 1993-02-08 |
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