EP0630700A1 - Oberes Werkzeug für Biegepresse - Google Patents

Oberes Werkzeug für Biegepresse Download PDF

Info

Publication number
EP0630700A1
EP0630700A1 EP94107730A EP94107730A EP0630700A1 EP 0630700 A1 EP0630700 A1 EP 0630700A1 EP 94107730 A EP94107730 A EP 94107730A EP 94107730 A EP94107730 A EP 94107730A EP 0630700 A1 EP0630700 A1 EP 0630700A1
Authority
EP
European Patent Office
Prior art keywords
upper tool
wedge
shaped member
engage
support plate
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
Application number
EP94107730A
Other languages
English (en)
French (fr)
Other versions
EP0630700B1 (de
Inventor
Susumu Kawano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Amada Metrecs Co Ltd
Original Assignee
Amada Metrecs Co Ltd
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 Amada Metrecs Co Ltd filed Critical Amada Metrecs Co Ltd
Publication of EP0630700A1 publication Critical patent/EP0630700A1/de
Application granted granted Critical
Publication of EP0630700B1 publication Critical patent/EP0630700B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B21D5/02—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
    • B21D5/0236—Tool clamping
    • 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

Definitions

  • the present invention relates to an upper tool removably attached to an upper tool holder device for a press brake, and more specifically to an upper tool which can actuate the upper tool holder device so that the clamping force can be increased when attached to the upper tool holder device.
  • the structure of a press brake is such that an upper table (referred to as an upper apron, sometimes) and a lower table (referred to as a lower apron, sometimes) are provided so as to be opposed vertically to each other and further any one of the upper and lower tables is moved up and down relative to the other as a ram.
  • an upper table referred to as an upper apron, sometimes
  • a lower table referred to as a lower apron, sometimes
  • an upper tool is attached to the lower portion of the upper table and a lower tool is attached to the upper portion of the lower table.
  • work disposed between the upper and lower tools can be bent when both the tools are engaged with each other by moving the movable-side table up and down.
  • a number of upper tool holder devices are attached to the lower portion of the upper table, and further a number of tools are removably supported by a number of the upper tool holder devices, respectively.
  • an upper tool clamp is mounted on a holder body attached to the lower portion of the upper table, and the upper portion of the upper tool is strongly fastened and fixed between the holder body and the upper tool clamp when the upper clamp is fastened with fastening bolts.
  • the present invention provides an upper tool for a press brake which comprises push actuating means for actuating upward an actuated member movable up and down, in a clamping force increasing mechanism such that an upper tool clamping force can be increased gradually when the actuated member mounted on an upper holder device of the press brake is moved upward.
  • the push actuating means is a lower surface of an engage groove portion extending horizontally and formed in any of a front or rear surface of the upper tool.
  • the push actuating means is a lower surface of an engage groove portion extending horizontally and formed in any of front and rear surfaces of the upper tool, an upper surface of the engage groove portion being engageable with a part of the actuated member.
  • the push actuating means is a lower surface of an engage groove portion extending horizontally and formed in any of front and rear surfaces of the upper tool, the engage groove portion being formed between a vertical position roughly the same as a holder contact surface formed at a shoulder portion of the upper tool and another vertical position slightly lower than an upper end of the upper tool.
  • an upper tool for a press brake which comprises push actuating means for actuating upward an actuated member movable up and down, in a clamping force increasing mechanism such that an upper tool clamping force can be increased gradually when the actuated member mounted on an upper holder device of the press brake is moved upward, said push actuating means being a lower surface of an engage groove portion rectangular in cross section and formed in any of front and rear surfaces of the upper tool, the upper surface of said engage groove portion being engageable with a projecting portion rectangular in cross section of the actuated member, and a vertical dimension of the rectangular projecting portion of the actuated member being determined to be slightly larger than that of the engage groove portion.
  • the upper tool for a press brake when the actuated member of the upper tool holder device is pushed upward by the push actuating means of the upper tool for a press brake relative to the upper tool holder device, since the clamping force increases gradually by the clamping force increasing mechanism, it is possible to clamp the upper tool securely. Accordingly, the upper tool can be mounted to the upper tool holder device easily and securely without use of any tool.
  • the present invention provides an upper tool for a press brake removably attached between an support plate provided at a lower portion of a holder body of an upper tool holder device mounted on an upper table of the press brake and an upper tool clamp pivotally attached to the upper holder body so as to push the upper tool against the support plate, wherein the upper tool is formed with: a contact surface brought into tight contact with a lower surface of the support plate; a slide surface brought into slidable contact with any of front and rear surfaces of the support plate; a wedge pushing-up portion for pushing upward a wedge-shaped member provided movably up and down at a lower portion of the upper tool clamp, in order to increase an upper tool clamping force by the upper tool clamp when the upper tool is moved upward relative to the support plate so that the contact surface of the upper tool can be brought into tight contact with the lower surface of the support plate; and a processing portion for processing work in cooperation with a lower tool.
  • the wedge pushing-up portion is a lower surface formed in an engage groove portion formed in the upper tool so as to be engageable with and disengageable from an engage projecting portion of the wedge-shaped member.
  • the engage groove portion is formed with an upper engage surface engageable with an upper surface of the engage projecting portion of the wedge-shaped member for prevention of the upper tool from being dropped from the upper tool holder device.
  • the wedge pushing-up portion is an upper surface formed in an engage projecting portion formed in the upper tool so as to be engageable with and disengageable from an engage groove portion formed in the wedge-shaped member.
  • the present invention provides an upper tool for a press brake removably attached between an support plate provided at a lower portion of a holder body of an upper tool holder device mounted on an upper table of the press brake and an upper tool clamp pivotally attached to the upper holder body so as to push the upper tool against the support plate, wherein the upper tool is formed with: a contact surface brought into tight contact with a lower surface of the support plate; a slide surface brought into slidable contact with any of front and rear surfaces of the support plate; a wedge pushing-up portion for pushing upward a wedge-shaped member provided movably up and down at a lower portion of the upper tool clamp in order to increase an upper tool clamping force by the upper tool clamp when the upper tool is moved upward relative to the support plate so that the contact surface of the upper tool can be brought into tight contact with the lower surface of the support plate; and a processing portion for processing work in cooperation with a lower tool, and wherein under the condition that the wedge pushing-up portion is brought into loose contact with the wedge-shaped member to
  • A denotes a dimension between a pivotal center of the upper tool clamp and an elastic member for pushing the upper tool clamp
  • B denotes an average dimension between the same pivotal center and a push actuating portion at which the upper tool clamp pushes the upper tool against the support plate via the wedge-shaped member
  • P denotes a pushing force for pushing the upper tool against the support plate
  • K denotes the elastic modulus of the elastic member
  • ⁇ denotes an inclination angle of the wedge-shaped member.
  • the upper portion of the upper tool is pinched between the support plate of the upper tool holder device and the pivotal upper tool clamp; the engage groove portion formed in the upper tool is engaged with the engage projecting portion of the wedge-shaped member provided movably up and down at the lower portion of the upper tool clamp; and the upper tool is moved upward relative to the support plate to move upward the wedge-shaped member by the wedge pushing-up portion formed at the lower surface of the engage groove portion of the upper tool.
  • the clamping force increases gradually by an elastic force of the elastic member, with the result that it is possible to clamp the upper tool securely.
  • the upper tool holder device 1 is removably attached to the lower portion of an upper table 3 of a press brake (not shown).
  • the upper tool holder device 1 is provided with a holder body 5 removably attached to the upper table 3, an upper tool clamp 11 pivotally attached to the holder body 5 to push and fix an upper portion 9U of an upper tool 9 against and to a support plate 7 formed integrally with the lower portion of the holder body 5, a clamping force adjusting mechanism 13 for adjusting the clamping force to the upper tool clamp 11, a clamp releasing mechanism 15 for releasing the upper tool 9 clamped by the upper tool clamp 11, and a wedge-shaped member 17 (actuated member) movable up and down relative to the lower portion of the upper clamp 11 and formed with an engage projecting portion 17K engageable with an engage groove portion 9K (push actuating means) formed in the upper tool 9.
  • the holder body 5 is formed with an upper block portion 5B having a thick wall extending in the front and rear direction (the right and left direction in Fig. 2) and a support plate 7 having a thin wall extending in the same direction and formed integral with the upper block portion 5B. Further, a mounting plate 21 is attached onto the front surface (on the left side surface in Fig. 2) of the upper block 5B of the holder body 5 with a plurality (two) of bolts 19 (see Fig. 1) so as to project upward away from the upper end portion of the holder body 5.
  • a wedge member 27 extending horizontally is interposed between the upper surface of the holder body 5 and the lower surface of the upper table 3.
  • a fixing bolt 31 is passed through a slot 29 formed in the mounting plate 21 so as to extend in the horizontal direction, and screwed into the wedge member 27 (see Fig. 2).
  • the above-mentioned upper tool clamp 11 is a plate member having a width (in the right and left direction in Fig. 1) roughly the same as that of the holder body 5, and pivotally attached to the holder body 5 so as to fasten and fix the upper portion 9U of the upper tool 9 between the upper tool clamp 11 and the support plate 7 (as shown in Fig. 2) and to the support plate 7.
  • the upper clamp 11 is supported so as to be pivotal in the front and rear direction by a plurality of mounting bolts 33 passing through a plurality (two) of through holes 11H formed at roughly the vertically middle portion of the upper tool clamp 11 and fixedly fastened toward the support plate 7 in the horizontal direction.
  • a spherical washer 35 is interposed between each head of the mounting bolts 33 and the upper tool clamp 11, as shown in Fig.2.
  • two coil springs 37 are elastically interposed between the upper tool clamp 11 and the support plate 7 so as to be urged away from each other.
  • the upper tool clamp 11 is formed with an inclined surface 11S at the lower portion thereof, whose upper end portion is inclined toward the support plate 7.
  • the wedge-shaped member (actuated member) 17 is disposed so as to be movable up and down relative to the inclined surface 11S.
  • the upper tool clamp 11 is formed with two slots 11LH extending in the vertical direction on the left and right sides at the lower end portion thereof. Further, two mounting bolts 39 passing through these slots 11LH, respectively are screwed into the wedge-shaped member (actuated member) 17, so that the wedge-shaped member 17 can be attached to the upper tool clamp 11 so as to be movable up and down, because the two mounting bolts 29 are movable within the slots 11LH. Further, the wedge-shaped member 17 is formed with the engage projecting portion 17K at an appropriate position thereof so as to be removably engageable with a horizontal engage groove portion 9K formed in the upper tool 9.
  • the engage projecting portion 17K is a projecting portion projecting outward from the wedge-shaped member (actuated member) 17, the cross-sectional shape of the engage projecting portion 17K is rectangular in shape, as shown in Fig. 2.
  • clamping force adjusting mechanism 13 is provided in a horizontal hole 5H formed in the upper block portion 5B of the holder body 5, so as to apply an adjustable clamping force to the upper tool 9 clamped between the upper clamp 11 and the support plate 7.
  • the clamping force adjusting mechanism 13 is composed of an adjust screw 41, a ring member 43 loosely fitted to the adjust screw 41, a nut member 45 in mesh with the adjust screw 41 to adjust the position of the ring member 43, and an elastic member 47 such as a spring disposed between a head portion 41H of the adjust screw 41 and the ring member 43.
  • the head portion 41H of the adjust screw 41 is in contact with the inner bottom wall portion of the hole 5H, and further a cylindrical push member 49 (into which the nut member 45 is inserted) is in contact with the ring member 43. Further, the end portion of the fastening screw 51 of the clamping force releasing mechanism 15 provided on the upper tool clamp 11 is in contact with the push member 49.
  • the clamp releasing mechanism 15 is composed of the fastening screw 51 passing through and screwed into the upper portion of the upper tool clamp 11 and a lever 53 formed integral with the fastening screw 51.
  • a plurality of small restriction pieces (or members) 57 are attached to the holder body 5 with bolts 59 so as to be in contact with the upper surface of the upper tool clamp 11. Accordingly, the upper clamp 11 can fasten or fix the upper tool 9 at any predetermined position stably without being moved up and down.
  • the upper tool 9 removably attached to the upper tool holder device 1 constructed as described above is formed with a contact surface 9F brought into contact with a lower end surface 7E of the support plate 7. Further, the upper tool 9 is formed with the upper portion 9U projecting upward from the contact surface 9F and with a slide surface 9S brought into slidable contact with the front surface of the support plate 7. Further, the upper tool 9 is formed with an engage groove portion (push actuating means) 9K on the surface opposite to the slide surface 9S. Further, the upper tool 9 is formed with a work processing portion 9M at the lower end portion thereof to bend a work K in cooperation with a lower tool 63 attached to the lower table 61 of the press brake.
  • the engage groove of the engage groove portion 9K is formed into a rectangular shape in cross section in such a way that the upper surface of the engage groove portion (push actuating means) 9K serves as an engage surface engageable with the upper surface of the engage projecting portion 17K of the wedge-shaped member (actuated member) 17, and further the lower surface thereof parallel to the upper surface thereof serves as a push actuating means or a wedge pushing-up portion for pushing up the lower surface of the engage projecting portion 17K of the wedge-shaped member 17. Accordingly, the engage projecting portion 17K of the wedge-shaped member 17 can be engaged with the engage groove portion 9K of the upper tool 9. Further, the vertical dimension of the engage groove portion 9K is determined to be slightly larger than that of the engage projecting portion 17K so that the wedge-shaped member 17 is not moved up and down excessively relative to the upper tool 9.
  • the upper tool 9 in the case where the upper tool 9 has been removed from the upper tool holder device 1, the upper tool 9 can be attached again to the upper tool holder device 1 as follows:
  • the lever 53 of the clamp releasing mechanism 15 is pivoted clockwise in Fig. 1 to the rightward position (R) to fasten the fastening screw 51.
  • R rightward position
  • the movable side of the upper and lower tables 3 and 61 of the press brake is moved up and down to engage the upper and lower tools 9 and 63 correctly with each other.
  • the upper tool 9 is generally moved upward relative to the holder body 5.
  • the upper tool clamp 11 can clamp the upper portion 9U of the upper tool 9 more strongly and tightly due to the increased elastic force of the elastic member 47 of the clamping force adjusting mechanism 13, with the result that it is possible to attach the upper tool 9 easily to the upper tool holder device 1.
  • the upper tool 9 in the case where the upper tool 9 has been already attached to the upper tool holder device 1, the upper tool 9 can be removed from the upper tool holder device 1 as follows:
  • the lever 53 of the clamp releasing mechanism 15 is pivoted to the leftward position (L) in Fig. 1 to unfasten the fastening screw 51, so that the upper tool 9 is released from the fastening condition by the upper tool clamp 11.
  • both the upper tool 9 and the wedge-shaped member 17 drop to the lowermost position due to their weights, respectively.
  • an upper surface of the engage groove portion 9K of the upper tool 9 is engaged with the engage projecting portion 17K of the wedge-shaped member 17, it is possible to prevent the upper tool 9 from being further dropped, thus maintaining the safety.
  • the upper tool holder device 1 As understood already, in the upper tool holder device 1 according to the present invention, it is possible to attach and remove the upper tool 9 to and from the upper tool holder device 1 easily, without use of any tool, in spite of the simple construction.
  • the structure is such that when the lower surface of the engage groove portion 9K (push actuating means) of the upper tool 9 pushes upward the engage projecting portion 17K of the wedge-shaped member (actuated member) 17, the clamping force (push force) of the upper tool clamp 11 against the support plate 7 increases gradually with increasing upward movement of the wedge-shaped member 17. Therefore, the wedge-shaped member 17, the upper clamp 11 and the clamp force adjusting mechanism 13, etc. construct a sort of clamp force increasing mechanism for increasing the clamping force gradually when the wedge-shaped member 17 (which serves as an actuated member) is moved upward relative to the support plate 7.
  • a clamping force adjusting mechanism 13 including the elastic member 47 As a part of the above-mentioned clamping force increasing mechanism, there is provided a clamping force adjusting mechanism 13 including the elastic member 47.
  • a hydraulic cylinder filled with a compressive fluid e.g., gas
  • the upper tool clamp 11 itself by a leaf spring without use of the clamping force adjusting mechanism 13.
  • the elastic deformation of the upper tool clamp 11 itself is used to generate the clamping force.
  • the clamping force increasing mechanism of the upper tool holder device can be constructed in various ways.
  • Fig. 3 shows a second embodiment of the upper tool holder device 1 according to the present invention, in which the wedge-shaped member (actuated member) 17 is formed with an engage groove portion 17K, and the upper tool 9 is formed with an engage projecting portion 9K (push actuating means) so as to be engageable with the engage groove portion 17K of the wedge-shaped member 17.
  • the wedge-shaped member 17 Is pushed upward by the engage projecting portion 9K of the upper tool 9.
  • Fig. 4 shows a third embodiment of the upper tool holder device 1 according to the present invention, in which the wedge-shaped member (actuated member) 17 is additionally formed with an upper engage projecting portion 17P.
  • the wedge-shaped member 17 is pushed upward by the upper surface of the upper tool 9.
  • Figs. 5 to 7 show the fourth embodiment of the upper tool holder device 1 according to the present invention, in which both the surfaces of the upper tool 9 can be reversed relative to each other and further an additional upper tool 9 can be attached to the rear surface side of the support plate 7 in cooperation with another rear side upper tool clamp 65. Accordingly, the same reference numerals have been retained for the similar parts or elements which have the same functions as with the case of the first embodiment, and only the points different from the first embodiment will be described hereinbelow, without repeating the similar detailed description thereof.
  • the rear side upper tool clamp 65 is provided on the rear side of the support plate 7.
  • a stud 67 formed with a semi-spherical head 67H is provided horizontally by use of a mounting bolt 69 on the rear surface of the support plate 7 of the holder body 5.
  • the rear side upper tool clamp 65 is pivotally supported by this stud 67.
  • a tool hole 11T is formed in the front side upper tool clamp 11. Further, a rotation-stop pin 71 is attached to the head portion 67H of the stud 67 so as to be engaged with a groove 65G formed in the rear side upper tool clamp 65. Therefore, even when the mounting bolt 69 is rotated, the stud 67 will not be rotated.
  • a small-diameter hole 73 is formed in the bottom wall portion of the hole 5H of the holder body 5. Further, a contact member 75 mounted on the upper portion of the rear side upper tool clamp 65 is passed through this small-diameter hole 73 and brought into contact with the head portion 41H of the adjusting screw 41.
  • a ring nut 77 is screwed into the hole 5H on the left side (in Fig. 2) to restrict the movement of the push member 49 of the clamping force adjusting mechanism 13.
  • the fourth embodiment it is possible to selectively attach the upper tool 9 reversed in the front and rear direction to the support plate 7 according to the bending shape of the work W. Further, the upper tool 9 can be attached to and removed from the upper tool holder device 1 easily for tool exchange.
  • the upper tool holder device 1 and the upper tool 9 according to the present invention it is possible to attach and remove the upper tool 9 to and from the upper tool holder device 1 easily in spite of the simple construction, without dropping the upper tool 9 even when the upper tool 9 is released from the upper tool holder device 1, thus improving the safety of the upper tool exchange work.
  • the upper tool 9 can be moved upward relative to the support plate 7 of the tool holder device 1, and the tool clamping force by the upper tool clamp 11 can be increased gradually when the wedge-shaped member (actuated member) 17 is pushed upward. Therefore, when the contact surface 9F of the upper tool 9 is brought into contact with the lower end surface 7E of the support plate 7, it is possible to obtain a sufficiently large clamping force.
  • A denotes a dimension between the pivotal center of the upper tool clamp 11 and the elastic means 47 of the clamping force adjusting mechanism 13 for pushing the upper tool clamp 11
  • B denotes an average dimension between the same pivotal center and the push actuating portion at which the upper tool clamp 11 pushes the upper tool 9 against the support plate 7 via the wedge-shaped member 17
  • P denotes a pushing force for pushing the upper tool 9 against the support plate 7
  • K denotes the elastic modulus of the elastic means 47
  • ⁇ denotes an inclination angle of the wedge-shaped member 17.
  • Fig. 9 shows a fifth embodiment of the upper tool holder device 101 and the upper tool 9 according to the present invention.
  • an upper tool holder device 101 is provided with a work cylinder 103. Further, the upper tool 9 is provided with a push actuating member (means) 107 for pushing upward an actuated rod (actuated member) 103P of the work cylinder 103.
  • actuated member actuated member
  • an upper clamp 111 is pivotally supported by a support plate 109 via a pin 113. This upper clamp 111 pushes and fixes the upper portion 9U of the upper tool 9 against and to the support plate 109 of the upper tool holder device 101.
  • a piston rod 115P is provided at the upper portion of the upper tool clamp 111.
  • the end of this piston rod 115P is reciprocatingly inserted into a clamp cylinder 115 attached to the support plate 109.
  • the cylinder 115 is linked with the work cylinder 103 provided with the actuated rod 103P via a hydraulic circuit composed of a check valve CV, an open/close valve V, and an accumulator ACC.
  • Fig. 10 shows a sixth embodiment of the present invention.
  • the upper surface of the upper portion 9U of the upper tool 9 is used as a push actuating means. That is, when an actuated (rod) member 121 (movable up and down) is pushed upward by this push actuating means (the upper surface) of the upper tool 9, since an upper wedge member 125 is pushed upward via an elastic member 123 disposed on the upper portion of the actuated rod member 121, the upper clamping 111 is pivoted in the counterclockwise direction in Fig. 10, so that the upper tool 9 can be pushed against and fixed to the support plate 109.
  • the upper tool for a press brake comprises push actuating means (9K, 107, 9U) for actuating upward an actuated member (17, 103P, 121) movable up and down, in a clamping force increasing mechanism such that an upper tool clamping force can be increased gradually when the actuated member (17, 103P, 121) mounted on an upper holder device (1) of the press brake is moved upward. Therefore, it is possible to clamp the upper tool securely to the upper tool holder device without use of any tool.
  • the upper tool is formed with only the push actuating means for pushing upward the actuated member. In other words, it is unnecessary to form the upper tool into a special shape.
  • the push actuating means is a lower surface of an engage groove portion (9K) extending horizontally and formed in any of a front or rear surface of the upper tool (9). Therefore, the shape of the push actuating means is simple.
  • the push actuating means is a lower surface of an engage groove portion (9K) extending horizontally and formed in any of front and rear surfaces of the upper tool (9), and an upper surface of the engage groove portion (9K) is engageable with a part of the actuated member (17). Therefore, the upper and lower surfaces of the engage groove portion formed in the upper tool can be utilized effectively.
  • the push actuating means is a lower surface of an engage groove portion (9K) extending horizontally and formed in any of front and rear surfaces of the upper tool (9), and the engage groove portion (9K) is formed between a vertical position roughly the same as a holder contact surface (9F) formed at a shoulder portion of the upper tool (9) and another vertical position slightly lower than an upper end of the upper tool. Therefore, when the upper tool is clamped between the upper tool clamp and the support plate, no moment for pivoting the upper tool will not be generated, so that it is possible to fix and clamp the upper tool more securely.
  • the upper tool for a press brake comprises push actuating means (9K) for actuating upward an actuated member (17) movable up and down, in a clamping force increasing mechanism such that an upper tool clamping force can be increased gradually when the actuated member (17) mounted on an upper holder device (1) of the press brake is moved upward.
  • the push actuating means (9K) is a lower surface of an engage groove portion (9K) rectangular in cross section and formed in any of front and rear surfaces of the upper tool (9); the upper surface of the engage groove portion (9K) is engageable with an engage projecting portion (17K) rectangular in cross section of the actuated member (17); and a vertical dimension of the rectangular engage projecting portion (17k) of the actuated member is determined to be slightly larger than that of the engage groove portion. Therefore, the upper tool can be removably attached to the upper tool holder device without applying an excessive vertical movement of the upper tool relative to the upper tool holder device, with the result that the upper tool can be exchanged stably.
  • the present invention provides an upper tool for a press brake removably attached between an support plate (7) provided at a lower portion of a holder body (5) of an upper tool holder device (1) mounted on an upper table (3) of the press brake and an upper tool clamp (11) pivotally attached to the upper holder body (5) so as to push the upper tool (9) against the support plate (7), wherein the upper tool is formed with: a contact surface (9F) brought into tight contact with a lower surface of the support plate (7); a slide surface (9S) brought into slidable contact with any of front and rear surfaces of the support plate; a wedge pushing-up portion (9K) for pushing upward a wedge-shaped member (17) provided movably up and down at a lower portion of the upper tool clamp (11), in order to increase an upper tool clamping force by the upper tool clamp (11) when the upper tool (9) is moved upward relative to the support plate (7) so that the contact surface (9F) of the upper tool can be brought into tight contact with the lower surface of the support plate; and a processing portion
  • the wedge pushing-up portion (9K) is a lower surface formed in an engage groove portion (9K) formed in the upper tool so as to be engageable with and disengageable from an engage projecting portion (17K) of the wedge-shaped member (17). Further, the engage groove portion (9K) is formed with an upper engage surface engageable with an upper surface of the engage projecting portion (17K) of the wedge-shaped member (17) for prevention of the upper tool from being dropped from the upper tool holder device (1). Further, the wedge pushing-up portion (9K) is an upper surface formed in an engage projecting portion (9K) formed in the upper tool so as to be engageable with and disengageable from an engage groove portion (17K) formed in the wedge-shaped member (17).
  • the upper tool for a press brake it is possible to facilitate mounting and dismounting of the upper tool to and from the upper tool holder device, in the mechanism by which the upper tool clamping force can be increased gradually when the upper tool is moved upward relative to the support plate of the upper tool holder device. Further, since a sufficient clamping force can be obtained whenever the upper tool is mounted to the upper tool holder device, it is possible to prevent the upper tool from being dropped from the upper tool holder device due to insufficient clamping force, while preventing that the upper tool is difficult to be dismounted from the upper tool holder device due to an excessive tool clamping force. Furthermore, since the upper tool is kept held by the upper tool holder device whenever the upper tool is being replaced, it is possible to improve the safety of upper tool exchange work.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
EP19940107730 1993-05-18 1994-05-18 Oberes Werkzeug für Biegepresse Expired - Lifetime EP0630700B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP11566593 1993-05-18
JP11566593 1993-05-18
JP115665/93 1993-05-18

Publications (2)

Publication Number Publication Date
EP0630700A1 true EP0630700A1 (de) 1994-12-28
EP0630700B1 EP0630700B1 (de) 1999-08-04

Family

ID=14668272

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940107730 Expired - Lifetime EP0630700B1 (de) 1993-05-18 1994-05-18 Oberes Werkzeug für Biegepresse

Country Status (4)

Country Link
EP (1) EP0630700B1 (de)
JP (1) JP3004597U (de)
CA (1) CA2123844A1 (de)
DE (1) DE69419838T2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5782308A (en) * 1995-12-15 1998-07-21 Amada Gmbh Quick clamping device for at least one tool of a machine tool
CN101417303B (zh) * 2008-12-01 2010-11-10 米路加（深圳）科技发展有限公司 一种模具夹具

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004052570A1 (ja) * 2002-12-12 2004-06-24 Aoki, Eisuke プレスブレーキ用上型ホルダー装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3932629A1 (de) * 1988-09-29 1990-04-05 Wila Maschf Bv Klemmvorrichtung, zum beispiel fuer das oberwerkzeug einer kantpresse
EP0387121A1 (de) * 1989-03-02 1990-09-12 Amada S.A. Haltevorrichtung für ein längliches Werkstück, wie ein Stempel, eine Matrize oder ein ähnliches Werkzeug auf einem Werktisch einer Abkantpresse
EP0569880A2 (de) * 1992-05-15 1993-11-18 Amada Metrecs Company, Limited Oberwerkzeug und Oberwerkzeugträger für eine Presse

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3932629A1 (de) * 1988-09-29 1990-04-05 Wila Maschf Bv Klemmvorrichtung, zum beispiel fuer das oberwerkzeug einer kantpresse
EP0387121A1 (de) * 1989-03-02 1990-09-12 Amada S.A. Haltevorrichtung für ein längliches Werkstück, wie ein Stempel, eine Matrize oder ein ähnliches Werkzeug auf einem Werktisch einer Abkantpresse
EP0569880A2 (de) * 1992-05-15 1993-11-18 Amada Metrecs Company, Limited Oberwerkzeug und Oberwerkzeugträger für eine Presse

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5782308A (en) * 1995-12-15 1998-07-21 Amada Gmbh Quick clamping device for at least one tool of a machine tool
CN101417303B (zh) * 2008-12-01 2010-11-10 米路加（深圳）科技发展有限公司 一种模具夹具

Also Published As

Publication number Publication date
DE69419838D1 (de) 1999-09-09
DE69419838T2 (de) 1999-11-25
EP0630700B1 (de) 1999-08-04
JP3004597U (ja) 1994-11-22
CA2123844A1 (en) 1994-11-19

Similar Documents

Publication Publication Date Title
US5572902A (en) Upper tool holder apparatus for press brake and upper tool attachable thereto
US5513514A (en) Upper tool and upper tool holding device for press brake
EP1213062B1 (de) Oberwerkzeug und Oberwerkzeugzusammenbau für eine Biegepresse und Verfahren zum Spannen des Oberwerkzeuges
US5619885A (en) Upper tool holder apparatus for press brake and method of holding the upper tool
US5507170A (en) Upper tool for press brake
US5782308A (en) Quick clamping device for at least one tool of a machine tool
US5794486A (en) Upper tool holder apparatus for press brake
US5511407A (en) Upper tool for press brake
EP0644002B1 (de) Oberes Werkzeug für Biegepresse
US6138492A (en) Tool holder for press brakes
US5685191A (en) Upper tool for press brake
US9211578B2 (en) Upper tool holder for press brake
EP0630700B1 (de) Oberes Werkzeug für Biegepresse
JP3170143B2 (ja) プレスブレーキ用上型
JP2740122B2 (ja) プレスブレーキ用上型
US6263721B1 (en) Upper tool holder apparatus in press brake
JP3006018U (ja) プレスブレーキ用上型
US5495743A (en) Lower tool device for press brake
SU1741953A1 (ru) Устройство дл креплени штампа на плите
JP2747224B2 (ja) プレスブレーキの上型ホルダ
SU1274839A1 (ru) Штамп дл групповой клепки
RU1811949C (ru) Устройство дл фиксации и прижима деталей
JPH06328135A (ja) プレスブレーキ用上型ホルダ装置
WO2023088790A1 (en) Bending machine
SU1449181A1 (ru) Гибочный штамп

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19950303

17Q First examination report despatched

Effective date: 19961206

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

REF Corresponds to:

Ref document number: 69419838

Country of ref document: DE

Date of ref document: 19990909

ITF It: translation for a ep patent filed

Owner name: JACOBACCI & PERANI S.P.A.

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20050503

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20050518

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20050629

Year of fee payment: 12

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060518

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20060531

Year of fee payment: 13

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20061201

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20060518

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20070131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070518