EP0682995B1 - Oberwerkzeug und Oberwerkzeugträger mit einem solchen Oberwerkzeug zur Verwendung mit einer Biegepresse und Verfahren zur Befestigung des Oberwerkzeuges - Google Patents

Oberwerkzeug und Oberwerkzeugträger mit einem solchen Oberwerkzeug zur Verwendung mit einer Biegepresse und Verfahren zur Befestigung des Oberwerkzeuges Download PDF

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Publication number
EP0682995B1
EP0682995B1 EP95401135A EP95401135A EP0682995B1 EP 0682995 B1 EP0682995 B1 EP 0682995B1 EP 95401135 A EP95401135 A EP 95401135A EP 95401135 A EP95401135 A EP 95401135A EP 0682995 B1 EP0682995 B1 EP 0682995B1
Authority
EP
European Patent Office
Prior art keywords
upper tool
clamp member
clamping force
press brake
tool clamp
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95401135A
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English (en)
French (fr)
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EP0682995A1 (de
Inventor
Susumu Kawano
Mamoru Sugimoto
Toshiro 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 Co Ltd
Original Assignee
Amada 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
Priority claimed from JP6149785A external-priority patent/JP2747224B2/ja
Priority claimed from JP6195434A external-priority patent/JP2740125B2/ja
Application filed by Amada Co Ltd filed Critical Amada Co Ltd
Priority to EP01123583A priority Critical patent/EP1213062B1/de
Publication of EP0682995A1 publication Critical patent/EP0682995A1/de
Application granted granted Critical
Publication of EP0682995B1 publication Critical patent/EP0682995B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • 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

Definitions

  • the present invention relates to an upper tool for a press brake, an upper tool holder assembly for a press brake, and a method of holding the upper tool by the upper tool holder assembly for a press brake.
  • An upper tool according to the pre-characterising part of claim 1 is known from EP-A-0 569 880.
  • a press brake is provided with an upper table (referred to as an upper apron, sometimes) and a lower table (referred to as a lower apron, sometimes) in mutually opposing positional relationship with respect to each other. Further, any one of the upper and lower tables is driven in the vertical direction as a ram.
  • an upper tool (referred to as a punch) is attached to the upper table and further a lower tool (referred to as a die) is attached to the lower table in order to bend plate-shaped work to various desired shapes.
  • the press brake in general, since the upper tools must be exchanged according to the bending shapes of work, a number of upper tool holders are arranged on the lower portion of the upper table. That is, a plurality of upper tools are supported by a plurality of upper tool holders so as to be exchanged with respect to each other.
  • an upper tool clamp member is attached to a holder body mounted on the lower portion of the upper table, and further fastened by use of fastening bolts, so that the upper portion of the upper tool can be strongly clamped between the holder body and the upper tool clamp member.
  • the upper tool clamp member must be half fastened to such an extent that the upper tool does not drop for alignment with the die, and after that the upper tool clamp member must be full fastened tightly after the upper tool and die have been aligned with each other.
  • the tool setting work is troublesome.
  • the upper tool can be clamped between the upper clamp member pivotally supported by the upper table and the holder body, since the upper tool must be attached to or removed from the upper table by pivoting the upper tool so as not to interfere with a pivotal axle of the upper tool clamp member; that is, since the upper tool must be pivoted by supporting the upper tool as heavy as 20 to 30 kg manually on the front side of the press brake, there exists a problem in that this work is dangerous for the worker (in particular for the worker's hand and waist.
  • the upper tool since the upper tool is clamped between the upper tool clamp member (pivotally supported by the upper table) and the holder body, the upper tool must be exchanged by pivoting the upper tool so as not to interfere with a pivotal axle of the upper tool clamp member, so that there exists another problem in that the shape of the upper tool is not simple, that is, complicated and thereby the upper tool cannot be processed easily.
  • the upper tool can be attached to or removed from the upper tool holder apparatus by pivoting an operation lever provided on the upper tool holder apparatus from a clamp position to an unclamp position or vice versa to facilitate the upper tool exchange.
  • the upper tool is exchanged by the upper tool holder apparatus by shifting the upper tool in the longitudinal (the right and left) direction, when some upper tool elements of a series of the split type upper tools of different lengths are required to be exchanged at the middle portion thereof, there exists a problem in that the upper tool exchange work is rather troublesome.
  • an upper tool clamp member 403 is attached to an upper holder body 401 fixed to a lower portion of an upper table (not shown). Therefore, an upper tool 407 can be fixed or clamped between the clamp member 403 and the upper tool holder body 401 when the clamp member 403 is fastened by use of a fastening bolt 405. Therefore, whenever the upper tools 407 are required to be exchanged with other upper tools, a great number of fastening bolts 405 must be rotated to unfasten and fasten the upper tool clamp members 403, with the result that the upper tool exchange work is troublesome.
  • an angle ulower end surface 409E of an upper support portion 409 of the upper holder body 401) and a sliding surface 407F slidable in contact with a vertical surface 409F of the upper tool support portion 409 is formed accurately at 90 degrees in correspondence to the angle between the lower surface 409E and the vertical surface 409F of the upper support body 409.
  • this angle is process as ⁇ ⁇ 90 degrees to prevent ⁇ > 90 degrees under consideration of the processing error. The reason is as follows: if ⁇ > 90 degrees, as shown in Fig. 25A exaggeratively, a gap is produced between the lower end surface 409E of the upper tool support portion 409 and the shoulder portion 407S.
  • the upper tool 407 when work is bent, the upper tool 407 is deformed in a direction that this gap is reduced. As a result, the lower end portion 407E of the upper tool 407 is deformed relatively large (due to the punching pressure) in accompany with this deformation due to the pressure of this gap, thus degrading the bending precision.
  • the fastening force applied to the fastening bolt 405 differs according to the worker
  • the deformation at the lower end portion 407E of the upper tool 407 differs according to the worker and/or worker's fatigued conditions.
  • Another object of the present invention is to provide an upper tool holder apparatus, which can clamp the upper tool under a constant clamping force and under excellent upper tool exchange reproducibility, without modifying the construction of the conventional structure largely.
  • the other object of the present invention is to provide a method of holding the upper tool by the upper tool holder apparatus under a constant upper tool clamping force whenever the upper tools are exchanged with other ones.
  • the present invention provides an upper tool for a press brake, as defined in claim 1.
  • the present invention provides an upper tool for a press brake in combination with a holding device as defined in any of claims 9 to 13.
  • the present invention provides an upper tool assembly for a press brake, comprising an upper tool and an upper tool holder apparatus, as defined in any of claims 14 to 28 and a method of clamping an upper tool as defined in claim 29.
  • the upper tool can be supported by the upper tool clamp member, the upper tool exchange work can be facilitated in safety. Further, since the vertical surface of the upper tool is used as the clamping surface, the upper tool according to the present invention can be clamped to the upper table by use of the ordinary upper tool clamp member.
  • the upper tool holder apparatus since the clamping force control means (the pusher screw) is thread-engaged with the upper tool clamp member and further since the clamp operation means (the operation lever) fixed to the pusher screw is selectively pivoted to the clamp position A for firmly clamping the upper tool, an unclamp position B for shifting the upper tool horizontally for upper tool adjustment and alignment, and further to the exchange position C for upper tool exchange, it is possible to adjust and exchange the upper tool easily and safely.
  • the upper tool clamp member urging means (the coil springs) are provided, when the operation lever is pivoted to the unclamp position B, the upper tool clamp member can be urged slightly in the clamp direction, so that it is possible to prevent the upper tool from being dropped during the upper tool adjustment or alignment.
  • the clamp release holding means (the engage recess and the ball plunger) are provided, when the operation lever is pivoted to the exchange position C, the upper tool clamp member can be kept away from the upper tool, so that it is possible to exchange the upper tool with a new one in the vertical direction easily.
  • stopper members are provided for determining the clamp position A and the unclamp position B of the operation lever, it is possible to easily pivot the operation lever to the respective positions.
  • the wedge piece is provided on the engage projection of the upper tool so as to be engaged with the drop prevention groove of the upper tool, it is possible to reduce the gap between the engage projection of the upper tool clamp member and the drop prevention groove of the upper tool for improvement of the upper tool drop.
  • the upper tool holder apparatus can be exchanged easily by use of the upper tool holder apparatus. Further, whenever the upper tools of the same upper wedge dimension are exchanged, since the clamping force of the upper tool can be kept at a constant value, it is possible to obtain an excellent reproducibility of the alignment between the upper tool and the die, ever after the upper tools are exchanged for various bending process. As a result, the upper tool exchange work can be facilitated and further the bending precision can be improved.
  • the upper tool holder apparatus 1 of the embodiment is removably attached to the lower portion of an upper table 3 of a press brake (not shown).
  • the upper tool holder apparatus 1 is composed of a holder body 5 removably attached to the upper table 3 and having a support plate 7, an upper tool clamp member 11 pivotally supported by the holder body 5 to clamp the upper portion 9U of an upper tool (punch) 9 in cooperation with the support plate 7 of the holder body 5, a clamping force adjusting device 13 for adjusting the clamping force applied to the upper tool clamp member 11, and a clamping force releasing device 15 for releasing the clamping force applied from the upper tool clamp member 11 to the upper tool 9. Further, a small pivotal contact member 17 is attached to end portion of the upper tool clamp member 11 in such a way that a contact surface 17S thereof is brought into slidable contact with an inclined surface 9S of the upper tool 9, as shown in Fig. 2.
  • the holder body 5 is composed of a thick-wall upper block portion 5B and a thin-wall support plate 7 formed integral with each other (when the thickness is seen from the right and left direction in Figs. 2 and 3). Further, a mounting plate 21 is fixed to the front surface (the left side in Fig. 2) of the upper block 5B of the holder body 5 with a plurality of bolts 19 (See Fig. 1).
  • the mounting plate 21 when the mounting plate 21 is brought into contact with the lower front surface of the upper table 3 and after that a clamp jaw 25 is fastened with a fastening bolt 23 to the upper table 3, the mounting plate 21 can be urged against the upper table 3, so that the holer body 5 can be fixed to the upper table 3.
  • a wedge member 27 is interposed between the upper surface of the holder body 5 and the lower surface of the upper table 3.
  • a fixing bolt 31 passed through a slot 29 (See Fig. 1) formed in the front mounting plate 21 so as to extend in the right and left direction is thread-engaged with the wedge member 27 (See Fig. 3).
  • the upper tool clamp member 11 is a plate member having roughly the same width as that of the holder body 5 (in Fig. 1), and pivotally supported by the holder body 5 via a plurality of mounting bolts 33 (when seen in Fig. 2). Therefore, the upper portion 9U of the upper tool 9 is clamped between the lower end of the upper tool clamp member 11 and the support plate 7 of the upper tool holder body 5.
  • the upper tool clamp member 11 is supported by a plurality of mounting bolts 33 passed through a plurality of through holes 11H formed at a vertically middle portion of the upper tool clamp member 11 and thread-engaged with the support plate 7 in the horizontal direction so as to be pivotal in the front and rear direction (the right and left direction in Fig. 2).
  • the contact surfaces between the head of the respective mounting bolts 33 and the upper tool clamp member 11 are formed into a spherical shape, respectively.
  • an elastic body 37 e.g., coil spring, rubber body, etc.
  • an inclined surface 11S is formed so as to approach the support plate 7 at the upper portion thereof. Further, a contact member 17 is attached to the inclined surface 11S so as to be pivotal slightly.
  • two through holes are formed on both sides of the lower portion of the upper tool clamp member 11 (See Fig. 1).
  • a mounting bolt 39 is passed through each of the through holes and further thread-engaged with the contact member 17.
  • a clearance is formed between each through hole and the mounting bolt 39, so that the contact member 17 can be pivotal slightly relative to the upper tool clamp member 11.
  • an engage projection 11K is formed at the lower portion of the upper tool clamp member 11 (below the contact member 17) so as to be engaged with an engage groove 9G (extending in the right and left direction in Fig. 1) formed in the upper tool 9.
  • the upper tool clamp member 11 serves to give a force for clamping the upper tool 9 in cooperation with the support plate 7. Further, a clamping force adjusting device 13 (See Fig. 3) for adjusting the upper tool clamping force is fitted to a horizontal hole 5H formed in the upper block portion 5B of the holder body 5.
  • the clamping force adjusting device 13 is composed of an adjust screw 41, a nut member 45 thread-engaged with the adjust screw 41 to adjust the position of a ring member 43 movably engaged with the adjust screw 41, and an elastic member (e.g., spring) 47 interposed between a head portion 41H of the adjust screw 41 and the ring member 43.
  • an elastic member e.g., spring
  • the adjust screw 41 when the adjust screw 41 is adjustably rotated, since the engage position between the adjust screw 41 and the nut member 45 can be shifted, the compression force or the clamping force of the elastic member 47 can be adjusted.
  • the head portion 41H of the adjust screw 41 of the clamping force adjusting device 13 is in contact with the bottom wall portion of the hole 5H, and further a cylindrical push member 49 enclosing the nut member 45 is in contact with the ring member 43, as shown in Fig. 3.
  • a fastening screw 51 of the clamping force releasing device 15 (provided at the upper portion of the upper tool clamp member 11) is in contact with the push member 49.
  • the clamping force releasing device 15 is a fastening screw 51 passed through and thread-engaged with the upper portion of the upper tool clamp member 11. Further, a lever 53 is fixed to the fastening screw 51.
  • the fastening screw 51 is fastened toward or unfastened away from the push member 49 to apply or release the upper tool clamping force of the clamping force adjusting device 13.
  • two stopper pins 55 are implanted in the mounting plate 21, as shown in Fig. 1.
  • a clamp opening springs 59 is interposed between each of the two bolts 57 (passed through the upper portion of the upper tool clamp member 11 and thread-engaged with the holder body 5 as shown in Fig. 2) and the holder body 5, so that the lower portion of the upper tool clamp member 11 can be opened, whenever the upper tool 9 is unclamped.
  • the upper tool clamp member 11 can clamp and unclamp the upper tool 9 at the fixed position.
  • the upper tool 9 is formed with a contact surface 9F brought into contact with the lower end surface 7E of the support plate 7. Further, a vertical sliding surface 9V brought into slidably contact with the front 7F or rear surface of the support plate 7 is formed in the upper portion 9U projecting from the contact surface 9F of the upper tool 9.
  • An engage groove 9G is formed on a surface opposite to the sliding surface 9V of the upper tool 9.
  • a short vertical surface 9SV is formed between the inclined surface 9S formed above the engage groove 9G and the engage groove 9G.
  • the vertical surface 9SV can be used when the upper tool 9 is clamped by the ordinary upper tool clamp member.
  • the upper tool 9 is formed with a work processing portion 9M at the lower end portion thereof to bend work W in cooperation with a die (lower tool) 63 attached to the lower table 61 as shown in Fig.2.
  • the lower surface 9GL of the engage groove 9G of the upper tool 9 is formed at a position higher than the contact surface 9F thereof.
  • the upper surface 9GF of the engage groove 9G is formed so as to be slightly inclined downward toward the groove bottom in correspondence to the upper surface of the engage projection 11K of the upper tool clamp member 11.
  • the lower end portion of the upper tool clamp member 11 can be determined relatively short at a position higher than the lower end surface 7E of the support plate 7, it is possible to prevent the upper tool clamp member 11 from interfering with work W bent at an acute angle, for instance.
  • the engage groove 9G of the upper tool 9 is located at a position higher than the contact surface 9F thereof, the width of the upper portion 9U of the upper tool 9 from a corner (at an intersection between the contact surface 9F and the sliding surface 9V) can be increased, so that the strength of the upper tool 9 can be increased.
  • the upper tool 9 can be attached to the upper tool holer apparatus 1 in the procedure as follows:
  • the lever 53 of the clamping force releasing device 15 is pivoted to the position R to fasten the fastening screw 51. Even under the condition that the fastening screw 51 is fastened, a gap can be formed between the lower portion of the upper tool clamp member 11 and the support plate 7.
  • the upper portion 9U of the upper tool 9 can be inserted between the upper tool clamp member 11 and the support plate 7 horizontally (in the right and left direction in Fig. 1) in such a way that the engage groove 9G formed in the upper tool 9 is engaged with the engage projection 11K of the lower portion of the upper tool clamp member 11 as shown in Fig. 2 and further the inclined surface 9S of the upper tool 9 is in contact with the contact surface 17S of the contact member 17.
  • the movable table any one of the upper table 3 and the lower table 61 of the press brake is moved in the vertical direction to engage the upper tool 9 with the die 63. Therefore, the upper tool 9 is moved upward relative to the holder body 5.
  • the upper tool 9 when the upper tool 9 is moved upward and thereby the contact surface 9F is brought into contact with the lower end surface 7E of the support plate 7, the upper tool 9 can be clamped strongly by the upper tool clamp member 11 on the basis of an elastic force of the elastic member 47. Therefore, the upper tool 9 can be easily clamped by the upper tool holder apparatus 1.
  • the upper tool 9 can be removed from the upper tool holder apparatus 1 as follows: First, the lever 53 is pivoted to the left side L to loosen the fastening screw 51. Then, the upper tool 9 is released from the upper tool clamp member 11.
  • the upper tool 9 When the upper tool 9 has been released from the upper tool clamp member 11, the upper tool 9 drops to the original lower position (as shown in Fig. 2) by the weight of itself. In this case, since the upper surface 9GF of the engage groove 9G of the upper tool 9 is engaged with the engage projection 11K of the upper tool clamp member 11, it is possible to prevent the upper tool 9 from being dropped, so that the upper tool removal operation is safe.
  • the upper tool 9 can be removed from the upper tool holder apparatus 1 by shifting the upper tool 9 horizontally in the right and left direction in Fig. 1.
  • the upper tool clamp member 11 when the upper tool 9 is engaged with the die 63, since the lower portion of the upper tool clamp member 11 is urged upward or clockwise by the inclined surface 9S of the upper tool 9, the clamping force of the upper tool 9 between the upper tool clamp member 11 and the support plate 7 can be increased gradually as the upper tool 9 is moved upward. Therefore, it is possible to consider that the upper tool clamp member 11, the clamping force adjusting device 13, etc. constitutes a kind of clamping force increasing mechanism such that when the upper tool 9 is moved upward relative to the support plate 7, the clamping force can be increased gradually.
  • the clamping force adjusting device 13 having the elastic member 47 is used as a part of the clamping force increasing mechanism, it is also possible to adopt a hydraulic (e.g., gas) cylinder including a compressive fluid (gas) instead of the clamping force adjusting device 13. Further, it is also possible to replace the upper tool clamp member 11 with a leaf spring to use the elastic deformation of the upper tool clamp member itself, without use of the clamping force adjusting device 13. In other words, various constructions can be adopted as the clamping force increasing mechanism of the upper tool holer apparatus 1.
  • the upper tool 9 can be attached to the rear surface of the support plate 7 by inverting the front and rear sides of the upper tool 9, as shown in Fig. 3.
  • a rear side upper tool clamp member 65 is pivotally provided on the rear surface of the support plate 7 in such a way that the upper tool 9 can be clamped between the rear side upper tool clamp member 65 and the rear surface side of the support plate 7.
  • a stud 67 having a semi-spherical head 67H is attached horizontally to the rear surface of the support plate 7 of the holder body 5 with the use of a mounting bolt 69.
  • the upper tool clamp member 65 is pivotally supported by the head 67H of this stud 67.
  • a tool hole 11T is formed in the front-side upper tool clamp member 11.
  • a stop pin 71 engaged with a groove 65G formed in the upper tool clamp member 65 is attached to the head 67H of the stud 67. Therefore, even when the mounting bolt 69 is rotated, the stud 67 will not be rotated together with the mounting bolt 69.
  • 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 thread-engaged with the upper portion of the rear-side upper tool clamp member 65 is passed through the small diameter hole 73 and further brought into contact with the head 41H of the adjust screw 41.
  • a ring nut 77 for stop the movement of the push member 49 of the clamping force adjusting device 13 is thread-engaged with the holder body 5.
  • the upper tool 9 when the mounting bolt 69 is fastened, the upper tool 9 can be clamped between the rear-side upper tool clamp member 65 and the rear surface of the support plate 7. In contrast with this, when the mounting bolt 69 is loosened, the upper tool 9 can be released from the rear-side upper tool clamp member 65.
  • the upper tool 9 can be selectively clamped between any one of the upper tool clamp members 11 and 65 and any one of the front and rear surfaces of the support plate 7 according to the bending shape of work W.
  • the upper tool 9 can be exchanged easily by use of the upper tool holder apparatus 1.
  • the upper tool 9 can be easily exchanged by use of the upper tool holer apparatus 1. In this exchange work, even if the upper tool 9 is released from the clamping force of the upper tool holder apparatus 1, since the upper tool 9 will not drop, it is possible to improve the safety of the upper tool holer apparatus 1.
  • H (B 2 • P) / (A 2 • K • tan ⁇ )
  • A denotes the distance between a pivotal center of the upper tool clamp member 11 and the elastic means 47 of the clamping force adjusting device 13 for urging the upper tool clamp member 11
  • B denotes an average distance between a pivotal center of the upper tool clamp member 11 and a clamping force application point (at which the upper tool clamp member 11 pushes the upper tool 9 against the support plate 7 via the contact member 17)
  • P denotes the clamping force for pushing the upper tool 9 against the support plate 7
  • K denotes the elastic coefficient (modulus of elasticity) of the elastic member 47; and the inclined surface 9S from the
  • the distance H is smaller than that expressed by the above formula. This is because 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 by a slight upward movement of the upper tool 9 relative to the support plate 7, a sufficient clamping force cannot be obtained. As a result, there exists a danger that the upper tool 9 drops.
  • the inclination angle ⁇ of the inclined surface 9S of the upper tool 9 lies between 5 and 20 degrees. That is, when the inclination angle is less than 5 degrees, the distance H must be increased to deform the elastic member 47 sufficiently. Further, when more than 20 degrees, although the distance H can be reduced, this is not desirable because the downward component force becomes large.
  • the frictional force (the maximum static friction force) can be expressed as (static friction coefficient x contact force), and the friction coefficient can be expressed as tan ⁇ (where ⁇ is a friction angle).
  • the friction coefficient changes according to the surface conditions of the inclined surface 9S and the contact surface 17S (i.e., surface roughness, material, presence or absence of lubricant, etc.). However, since the friction coefficient between two metals usually lies between 0.15 and 0.20, it is desirable that the inclination angle ⁇ of the inclined surface 7S lies between 7 and 11 degrees.
  • the upper tool holder apparatus can be modified as follows:
  • a high hardness portion 9H at the inclined surface 9S and the sliding surface 9H of the upper tool 9, in order to improve the abrasion resistance.
  • a hard alloy chip is attached onto the surfaces, or the surfaces are coated with a hard material or quenched.
  • an upper tool clamp member 101 is fastened to the support plate 7 of the holder body 5 by use of a bolt 103, and further a clamp piece 105 is provided at the lower portion of the upper tool clamp member 101.
  • the clamp piece 105 is formed into a semi-spherical or semi-cylindrical shape, and pivotally supported by a slider 107 slidably fitted to a hole 101H formed in the lower portion of the upper tool clamp member 101. Further, an elastic member 109 (such as a dish spring, urethane rubber, etc.) is interposed between the slider 107 and the bottom portion of the hole 101H of the upper tool clamp member 101.
  • an elastic member 109 such as a dish spring, urethane rubber, etc.
  • the space between the support plate 7 of the holder body 5 and the upper tool clamp member 101 can be kept constant, so that the space between the support plate 7 and the clamp piece 105 can be also kept constant.
  • the upper portion 9U of the upper tool 9 is inserted between the support plate 7 and the clamp pieced 105 horizontally in the right and left direction (perpendicular to the paper).
  • a wedge-shaped spring washer 111 is disposed at the bottom portion of the hole 101H formed in an upper tool clamp member 101 in such a way as to be adjusted by another wedge member 115 moved by an adjust screw 113.
  • the structure other than the above is the same as that shown in Fig. 7.
  • a thin-wall portion 101A is formed at a part of the upper tool clamp member 101 in such a way as to be deformed elastically.
  • the upper tool clamp member 101 itself is provided with the elastic member.
  • a bolt 103 is passed through the support plate 7, and an elastic member 119 is interposed between a nut member 117 thread-engaged with the end of the bolt 103 and the support member 7.
  • the upper tool can be supported by the upper tool clamp member, the upper tool exchange work can be facilitated in safety. Further, since the vertical surface of the upper tool is used as the clamping surface, the upper tool according to the present invention can be clamped to the upper table by use of the ordinary upper tool clamp member.
  • the upper tool holder apparatus 201 of the present embodiment is removably attached to the lower portion of an upper table 203 of a press brake (not shown). Further, a plurality of the upper tool holder apparatus 201 are mounted being arranged at appropriate intervals horizontally in the right and left direction of the lower portion of the upper table 203 in Fig. 11. In other words, since various types of the upper tools 205 such as a single long upper tool (extending horizontally in the right and left direction perpendicular to Fig. 12), a plurality of split-type upper tools of different short lengths, etc. are used for a press brake, a plurality of the upper tool holder apparatus 29 are arranged at intervals on the upper table 203.
  • the upper tool holder apparatus 201 is composed of a holder body 207 removably attached to the upper table 203 and having an upper tool support portion 209 at the lower portion thereof, an upper tool clamp member 211 for clamping ar upper portion 205U of an upper tool 205 in cooperation with the upper tool support portion 209 of the holder body 207, clamping force generating means (e.g., a spring) 213 for applying a clamping force to the upper tool clamp member 211, clamp operating means (e.g., a lever) 215 for controllably transmitting a clamping force of the clamping force generating means 213 to the upper tool clamp member 211, upper tool clamp member urging means (springs) 217 (See Fig.
  • clamping force generating means e.g., a spring
  • clamp operating means e.g., a lever
  • upper tool clamp member urging means springs
  • the holder body 207 is formed with a thick-wall upper block portion 207B and a thin-wall lower support plate 209 both integral with each other (when seen from the right and left direction in Fig. 12). Further, a mounting plate 225 projecting upward is fixed to the front surface (the left side in Fig. 12) of the upper block portion 207B of the holder body 207 with a plurality of bolts 221 and pins 223 (both shown in Fig. 11).
  • the mounting plate 225 is formed with a cutout portion 255C widened downward at the lower middle portion thereof. Further, as shown in Fig. 12, the upward projecting portion of the mounting plate 225 is brought into contact with the front lower portion of the upper table 203. When a clamp jaw 229 is fastened with a fastening bolt 227 thread-engaged with the upper table 203, the upper projecting portion of the mounting plate 225 is fixed to the upper table 203, so that the holder body 207 can be fixed to the upper table 203.
  • the holder body 207 and the mounting plate 225 are provided separately and fixed to each other, it is also possible to form the holder body 207 and the mounting plate 225 integral with each other.
  • the mounting plate 225 is regarded as a part of the holder body 207.
  • a wedge member 231 is adjustably interposed between the upper surface of the holder body 207 and the lower surface of the upper table 203 so as to be movable horizontally in the right and left direction (in Fig. 11).
  • a fixing bolt 235 passed through a slot 233 (extending in the right and left direction in Fig. 11) formed in the mounting plate 225 is thread-engaged with the wedge member 231.
  • the upper tool clamp member 211 is a plate member having a width roughly the same as that of the holder body 207. Further, the upper tool clamp member 211 is formed with a projection fitted to the downward-widened cutout portion 255C formed in the mounting plate 225. The upper tool clamp member 221 is pivotally supported by the holder body 207 to clamp and unclamp the upper portion 205U of the upper tool 205.
  • a plurality of through holes 211H are formed at the vertically middle portion of the upper tool clamp member 211.
  • a plurality of mounting bolts 239 are passed through these through holes 211H, thread-engaged with the upper tool support portion 209 horizontally, and further fixed by nuts 237, respectively. Therefore, the upper tool clamp member 211 can be pivotally supported by head portions of the mounting bolts 239. Further, a coil springs 241 is elastically interposed between the upper tool support portion 209 and the upper tool clamp member 211, respectively.
  • the contact surfaces of the head portion of the mounting bolt 239 and the through hole 211H are both formed into a spherical surface, respectively to allow the upper tool clamp member 211 to be pivoted smoothly.
  • an engage projection 211P engaged with a drop prevention groove 205G formed at the upper portion of the upper tool 205 is formed so as to project toward the upper tool support member 209. Further, a push contact member 243 brought into contact with the inclined surface 205S of the upper portion 205U of the upper tool 205 to urge the upper tool 205 against the upper tool support portion 209 is provided slightly above the engage projection 211P.
  • the push contact member 243 is formed by cutting parts of the circumferential surface of a cylindrical body into flat surfaces, and mounted at the lower portion of the upper tool clamp member 211 via a plurality of screws 245 so as to be pivoted slightly when seen in Fig. 12.
  • a wedge member 247 engaged with the drop prevention groove 205G of the upper tool 205 is provided between the engage projection 211P of the upper tool clamp member 211 and the push contact member 243.
  • This wedge member 247 is always urged by an elastic member 249 such as a coil spring interposed between the upper tool clamp member 211 and the wedge member 247 in the direction as to be engaged with the drop prevention groove 205G of the upper tool 205.
  • the horizontal movement of the wedge member 247 by the elastic member 249 is restricted when brought into contact with a part of the push contact member 243.
  • the upper rear-side (right side in Fig. 12) end surface of the wedge member 247 is chamfered (247S) to facilitate engagement with and disengagement from the drop prevention groove 205G of the upper tool 205.
  • the clamping force generating means 213 is provided in a hole 207H formed in the block portion 207B of the holder body 207.
  • the clamping force generating means 213 applies a clamping force for urging the upper tool 205 against the upper tool support portion 209 of the holder body 207, via the push contact member 243 provided at the lower portion of the upper tool clamp member 211.
  • the clamping force generating means 213 is composed of an adjust screw 251, a ring member 253 slidably fitted to the adjust screw 251, a nut member 255 thread-engaged with the adjust screw 251, and an elastic member 257 such as a dish spring interposed between the head 251H of the adjust screw 251 and the ring member 253.
  • the head portion 251H of the adjust screw 251 is in contact with the bottom wall of the hole 207H. Further, one end of the cylindrical push member 259 enclosing the nut member 255 and slidably fitted into the hole 207H is in contact with the ring member 253. The other end of the push member 259 is in contact with a ring nut 261 adjustably thread-engaged with the hole 207H of the holder body 207. Further, a pin-shaped pusher member 259P provided at the other end of the cylindrical push member 259 projects from the ring nut 261 to the left side in Fig. 12.
  • the clamp operating means 215 for transmitting the clamping force of the clamping force generating means 213 to the upper tool clamp member 211 is provided above the upper tool clamp member 211.
  • the clamp operating means 215 has a clamping force control member (a pusher screw) 263 thread-engaged with the upper portion of the upper tool clamp member 211. Therefore, the pusher screw 263 can be pivoted together with the upper tool clamp member 211.
  • the clamping force control member (pusher screw) 263 is brought into contact or away from the pin-shaped pusher member 259P.
  • an operation lever 265 is removably attached to the pusher screw 263. That is, an engage hole 263H is formed in the pusher screw 263, and an engage block 267 of the operation lever 265 is engaged with the engage hole 263H. Further, a ball plunger 269 is attached to the engage block 267 in such a way as to be engaged with an groove (not shown) formed in the engage hole 263H. This ball plunger 269 prevents the engage block 267 from being rotated relative to the pusher screw 263.
  • the operation lever 265 can be pivoted to a clamp position A (See Fig. 11) at which the upper tool clamp member 211 clamps the upper tool 205 in cooperation with the upper tool support portion 209, to an unclamp position B at which the upper tool clamp member 211 unclamps the upper tool 205 (so that the upper tool 205 can be shifted horizontally in the right and left direction in Fig. 11) for upper tool horizontal position adjustment, and to an exchange position C at which the upper tool 205 can be removed vertically from the upper tool clamp member 211 for upper tool exchange.
  • two stoppers 271 are attached to the mounting plate 225 to locate the operation lever 265 at the clamp and unclamp positions A and B, respectively.
  • two slits 273 are formed in the mounting plate 225 at such positions as to correspond to the clamp and unclamp positions A and B, respectively.
  • a stopper member 271 is pivotally supported via a pin 275 in such a way as to project from or retract from the front surface of the mounting plate 225.
  • a recessed portion 225H communicating with the slit 273 is additionally formed in the mounting plate 225 so that the stopper member 271 can be easily pivoted upward and downward relative to the surface of the mounting plate 225.
  • a ball plunger 277 engaged with a recessed portion formed in the outer circular-arc shaped portion of the stopper member 271 is attached to the mounting plate 225 to keep the raised stopper member 271 and retracted stopper member 271 at its position, respectively.
  • the upper tool clamp member urging means 217 (See Fig. 11) push and urge the upper tool clamp member 211 so that the upper tool 205 can be urged slightly against the upper tool support portion 209.
  • the upper tool clamp member urging means 217 are elastic members 217S such as coil springs interposed between the upper portion of the upper tool clamp member 211 and the block portion 207B of the holder body 207, as shown in Fig. 11.
  • the clamp release holding means 219 holds the upper tool clamp member 211 at such a position that the upper tool 205 is perfectly released from the upper tool clamp member 211, against an elastic force of the upper tool clamp member urging means 217.
  • the clamp release holding means 219 is a ball plunger 281 attached on the mounting plate 225 and engaged with an engage recess 279 (e.g., groove, hole, etc.) formed in the upper portion of the upper tool clamp member 211. Further, it is also possible to form the recessed portion 279 in the mounting plate 225 and to attach the ball plunder 281 to the upper tool clamp member 211, in the opposite way thereto.
  • the upper tool 205 can be exchanged by moving the upper tool 205 in the vertical direction relative to the upper tool clamp member 211.
  • the upper tool 205 can be adjustably moved in the horizontal direction to locate the upper tool 205 relative to the upper tool holder apparatus 201.
  • the upper tool 205 is of split type, a plurality of split upper tools are arranged and located so as to be brought into contact with each other.
  • the upper tool 205 can be firmly clamped between the upper tool support portion 209 of the holder body 207 and the upper tool clamp member 211 of the upper tool holder apparatus 201. That is, since the pusher screw 263 pushes strongly the pusher member 259P of the clamping force generating means 213, the upper tool clamp member 211 firmly clamps the upper tool 205 in cooperation with the upper tool support portion 209 by a reaction force of the clamping force generating means 213 (the elastic member 257), as shown in Fig. 16B.
  • the operation lever 256 is pivoted counterclockwise to the vertical exchange position C, as shown in Fig. 18A.
  • the upper tool clamp member 211 since the upper tool clamp member 211 is released from the clamping force, the upper tool clamp member 211 can be pivoted clockwise (the arrow direction R) in Fig. 18B manually to engage the ball plunger 281 with the recess 279 of the upper tool clamp member 211, against an elastic force of the upper tool clamp member urging means 217, so that the lower portion of the upper tool clamp member 211 can be kept opened. Therefore, the upper tool 205 can be moved vertically downward, so that it is possible to remove the upper tool 205 from the upper tool clamp member 211 easily in the downward direction.
  • the operation lever 265 is pivoted clockwise to the unclamp position B once to disengage the engage recessed portion 279 from the ball plunger 281. After that, the operation lever 265 is pivoted counterclockwise again to the vertical exchange position C, as shown in Fig. 14A. Under these conditions, the upper tool 205 can be attached to the upper tool holder apparatus 211 again from below.
  • a rear upper tool clamp member 283 can be pivotally attached on the rear surface (on the right side surface in Fig. 12) of the holder body 207 so that the upper tool 205 can be clamped by turning over the upper tool 205 from the front side to the rear side.
  • a support pin 285 (which corresponds to the mounting bolt 239) is mounted horizontally with a fixing bolt 289 passed through a pipe-shaped spacer 287. Further, the rear upper tool clamp member 283 is pivotally supported by the support pin 285. Further, the head portion 291 of a bolt 291 mounted on the upper portion of the rear upper tool clamp member 283 is in contact with the head portion 251H of the adjust screw 251 of the clamping force generating means 213.
  • an engage pin 293 fixed to the support pin 285 is engaged with a groove 283G formed in the rear upper tool clamp member 283, to prevent the support pin 285 from being pivoted relative to the rear upper tool clamp member 283.
  • the upper tool 205 can be unclamped from the rear upper tool clamp member 283 by rotating the fixing bolt 289. Further, the upper tool 205 can be clamped by the rear upper tool clamp member 283 in the same way as with the case of the second prior art example, so that any detailed description thereof is omitted herein.
  • a gaseous spring can be used as the clamping force generating means 213.
  • a cylindrical cam formed with three-stage cams brought into contact with the pusher member 259P can be adopted.
  • the clamping force control means (the pusher screw) is thread-engaged with the upper tool clamp member and further since the clamp operation means (the operation lever) fixed to the pusher screw is selectively pivoted to the clamp position A for firmly clamping the upper tool, an unclamp position B for shifting the upper tool horizontally for upper tool adjustment and alignment, and further to the exchange position C for upper tool exchange, it is possible to adjust and exchange the upper tool easily and safely.
  • the upper tool clamp member urging means (the coil springs) are provided, when the operation lever is pivoted to the unclamp position B, the upper tool clamp member can be urged slightly in the clamp direction, so that it is possible to prevent the upper tool from being dropped during the upper tool adjustment or alignment.
  • the clamp release holding means (the engage recess and the ball plunger) are provided, when the operation lever is pivoted to the exchange position C, the upper tool clamp member can be kept away from the upper tool, so that it is possible to exchange the upper tool with a new one in the vertical direction easily.
  • stopper members are provided for determining the clamp position A and the unclamp position B of the operation lever, it is possible to easily pivot the operation lever to the respective positions.
  • the wedge piece is provided on the engage projection of the upper tool so as to be engaged with the drop prevention groove of the upper tool, it is possible to reduce the gap between the engage projection of the upper tool clamp member and the drop prevention groove of the upper tool for improvement of the upper tool drop.
  • an upper tool holder apparatus which is not according to the present invention will be described hereinbelow with reference to Figs. 19 and 20.
  • an upper tool holder 301 is removably attached to the lower portion of an upper table 303 of a press brake (not shown). Although only one upper tool holder apparatus 301 is shown, in practice, however, a plurality of upper tool holder apparatus 301 are attached at appropriate intervals to the lower portion of the upper table 303.
  • the upper tool holder apparatus 301 is composed of a holder body 307 for supporting the upper tool 305, and an upper tool clamp member 309 for clamping the upper tool 305 in cooperation of the upper tool holder body 307.
  • the upper tool holder body 307 is formed with a thick-wall upper block portion 311 and a thin-wall upper tool support portion 313 integral with each other. Further, a mounting plate 317 is fixed to the front surface (the right side in Fig. 20) of the upper block portion 311 of the upper tool holder body 307 with a plurality of bolts 315 (See Fig. 19).
  • the mounting plate 317 when the mounting plate 317 is brought into contact with the lower front surface of the upper table 303 and after that a clamp jaw 321 is fastened by a fastening bolt 319 thread-engaged with the upper table 303, the mounting plate 317 can be fixed to the upper table 303, so that the upper tool holer body 307 can be mounted to the upper table 303.
  • a wedge member 323 extending horizontally in the right and left direction (in Fig. 19) is interposed between the upper surface of the upper block portion 311 and the lower surface of the upper table 303.
  • a fixing bolt 325 passed through a slot 317H (See Fig. 20) formed in the mounting plate 317 so as to extend in the right and left direction is thread-engaged with the wedge member 323.
  • the upper tool clamp member 309 is formed by a plate member, and is pivotally (when seen in Fig. 20) supported by the upper tool holder body 307 via a bolt 327 (fastening means) passed through a through hole 309H formed in the upper tool clamp member 309.
  • a contact portion 309T is formed in the upper and inner surface of the upper tool clamp member 309 so as to be brought into contact with the front surface of the upper block portion 311 of the upper tool holder body 307, and an engage projection 309P engaged with an engage groove 5G of the upper tool 305 is formed at the lower portion of the upper tool clamp member 309 so as to project inward.
  • an inclined surface 309F widened downward and brought into contact with an inclined surface 305F formed at the upper wedge portion 305W of the upper tool 305 is formed in the lower inner surface of the upper tool clamp member 309.
  • the inclined surface 309F is so inclined that the space between the upper tool support portion 313 of the upper tool holder body 307 and the upper tool clamp member 309 can be narrowed upward.
  • both the end edges of the inclined surface 309F and the upper surface of the engage projection 309P of the upper tool clamp member 309 are chamfered (309C) so that the upper tool 305 can be inserted smoothly between the upper tool support portion 313 and the upper tool clamp member 309 horizontally in the right and left direction in Fig. 19.
  • the bolt 327 (fastening means) is formed with a small-diameter threaded portion 327S thread-engaged with the upper tool support portion 313 and a large-diameter body portion 327B, so that the upper tool clamp member 309 can be fastened by the bolt 327 always at a constant fastening position relative to the upper tool support portion 313.
  • an elastic member 329 e.g., dish spring, urethane rubber, etc.
  • a weak coil spring 331 is interposed to widen the space between the upper tool clamp member 309 and the upper tool support portion 313.
  • the bolt 327 is previously fastened tightly to the upper tool support portion 313 by use of a fastening tool 333 (e.g., wrench).
  • a fastening tool 333 e.g., wrench
  • the wedge portion 305W of the upper tool 305 is inserted into the above-mentioned space horizontally in the right and left direction in Fig. 19.
  • the chamfered surfaces 309C are formed in the upper tool clamp member 309, the wedge portion 305W of the upper tool 305 can be inserted smoothly between the upper tool support portion 313 and the upper tool clamp member 309.
  • the upper table 303 or the lower table 335 of the press brake is moved up and down relative to each other to engage the lower end portion 305E of the upper tool 305 with a die 337 mounted on the lower table 335.
  • the upper tool 305 is moved upward relative to the upper tool holder body 307.
  • the shoulder portion 305S of the upper tool 305 is brought into contact with the lower end surface 313E of the upper tool support portion 313, the upper tool 305 stops moving upward and thereby the upper tool 305 can be located (setup) relative to the upper tool holder body 307.
  • the wedge portion 305W of the upper tool 305 can be clamped between the upper tool clamp member 309 and the upper tool support portion 313.
  • the clamping force is kept constant, as far as the upper tool 305 of the same wedge portion in dimension are clamped. Accordingly, it is possible to prevent the lower end portion 305E of the upper tool 305 from being dislocated slightly due to a difference in the clamping force of the upper tool clamp member 309, so that the lower end portion 305E of the upper tool 305 can be held always at a constant position.
  • the bolt 327 is slightly loosened by use of the tool 333.
  • the loosening rate of the bolt 327 is small, because the elastic force of the elastic member 329 is reduced to such an extent that the upper tool 305 can be moved. Therefore, it is possible to exchange the upper tool 305 easily by use of the upper tool holder apparatus 301.
  • annular spacer 339A is interposed between the upper tool support portion 313 and the body portion 237B of the bolt 327.
  • another spacer 339B is interposed between the upper tool clamp member 309 and the elastic member 329 or between the elastic member 329 and the head portion 327H of the bolt 327.
  • Fig. 22 shows a modification of the apparatus of Figures 19 and 20.
  • the head portion of the bolt 327 shown in Fig. 20 is replaced with a push member 341, a lever 347 and a cam member 345.
  • the annular push member 341 is fitted to the body portion 327B of the bolt 327 so as to be brought into contact with the elastic member 329.
  • the cam member 345 is pivotally supported by the bolt 327 via a pin 343.
  • the lever 347 is attached to the cam member 345.
  • the push member 341 can be shifted by the cam member 345 by a predetermined distance, so that a space between the upper tool clamp member 309 and the annular push member 341 can be determined at a previously determined constant value to obtain a constant clamping force of the elastic means 329.
  • the lever 347 When the upper tool 305 is required to be released from the clamping force, the lever 347 is pivoted horizontally, for instance. Then, since the annular push member 341 is released via the cam member 345, the clamping force of the elastic member 239 can be released.
  • the effect is the same as that of the third embodiment. Further, the clamp and unclamp conditions of the upper tool holder apparatus 301 can be confirmed easily by seeing whether the lever 347 is pivoted vertically or horizontally.
  • Fig. 23 shows still another modification of the apparatus of Figures 19 and 20.
  • the bolt 327 is passed through the upper tool support portion 313, and the elastic member 329 is interposed between a nut member (fastening member) 349 thread-engaged with the end portion of the bolt 327 and the upper tool support portion 313, without use of the elastic member interposed between the head portion 327H of the bolt 327 and the upper tool clamp member 309.
  • the upper tool 305 can be clamped at a constant clamping force, and thereby the same effect as described above can be obtained.
  • an upper tool clamp member 351 is formed with a hole 351H, and a semi-spherical clamp piece 353 fixed to a piston slider 355 is fitted to the hole 351. Further, a nitrogen gas is introduced into the hole 351H. The clamping force of the elastic means is adjusted by the pressure of the nitrogen gas introduced into the hole 351H. In this modification, the same effect can be obtained.
  • the upper tool can be exchanged easily by use of the upper tool holder apparatus. Further, whenever the upper tools of the same upper wedge dimension are exchanged, since the clamping force of the upper tool can be kept at a constant value, it is possible to obtain an excellent reproducibility of the alignment between the upper tool and the die, ever after the upper tools are exchanged for various bending process. As a result, the upper tool exchange work can be facilitated and further the bending precision can be improved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Clamps And Clips (AREA)

Claims (29)

  1. Oberwerkzeug zum Einsatz mit einer Biegepresse, die mit einer Haltevorrichtung (1), vorzugsweise wie die Oberwerkzeug-Haltevorrichtung, die in Anspruch 14 oder 24 definiert ist, versehen ist, wobei die Haltevorrichtung (1) einen Oberwerkzeug-Halterkörper (5), der mit einer Stützplatte (7) versehen ist, und ein Oberwerkzeug-Klemmelement (11) enthält, wobei das Oberwerkzeug an dem Halterkörper (5), der an einem Obertisch (3) angebracht ist, durch eine Klemmkraft des Oberwerkzeug-Klemmelementes (11) festgeklemmt wird, wobei das Oberwerkzeug (9) umfasst:
    eine geneigte Fläche (9S), die dazu geeignet ist, in Funktion mit dem Oberwerkzeug-Klemmelement (11) so zusammenzuwirken, dass das Oberwerkzeug (9) relative Bewegungen in Bezug auf das Oberwerkzeug-Klemmelement (11) ausführen kann, um so eine allmählich zunehmende Klemmkraft zu erzeugen;
    eine vertikale Gleitfläche (9V), die geeignet ist, um in Funktion an einer vorderen oder einer hinteren Fläche der Stützplatte (7) zu gleiten;
    einen Oberwerkzeug-Abschnitt (9U), der eine Kontaktfläche (9F) aufweist, die in Funktion mit einer unteren Endfläche (7E) der Stützplatte (7) in Kontakt kommen kann; und
    einen Erzeugnisbearbeitungs-Abschnitt (9M) zum Bearbeiten eines Werkstücks (W) im Zusammenwirken mit einem Unterwerkzeug (63),
    dadurch gekennzeichnet, dass das Oberwerkzeug (9) des Weiteren eine Eingriffsnut (9G) auf der gleichen Seite wie die geneigte Fläche (9S) und unter ihr umfasst, die dazu geeignet ist, in Funktion mit einem Eingriffsvorsprung (11K) in Eingriff zu kommen, der an dem Oberwerkzeug-Klemmelement (11) ausgebildet ist, wobei die Kontaktfläche (9F) so angeordnet ist, dass sie niedriger ist als eine untere Fläche der Eingriffsnut (9G).
  2. Oberwerkzeug für eine Biegepresse nach Anspruch 1, dadurch gekennzeichnet, dass die geneigte Fläche (9S) mit einem Neigungswinkel von 5-20° zu einer vertikalen Richtung geneigt ist.
  3. Oberwerkzeug für eine Biegepresse nach Anspruch 1, dadurch gekennzeichnet, dass die geneigte Fläche mit einem Neigungswinkel von 7-11° zu einer vertikalen Richtung geneigt ist.
  4. Oberwerkzeug für eine Biegepresse nach Anspruch 1, dadurch gekennzeichnet, dass eine obere Fläche der Eingriffsnut (9G) so ausgebildet ist, dass sie in einer Richtung senkrecht zu der vertikalen Richtung geneigt ist.
  5. Oberwerkzeug für eine Biegepresse nach Anspruch 1, dadurch gekennzeichnet, dass eine vertikale Fläche (9SV) zwischen der geneigten Fläche (9S) und der Eingriffsnut (9G) ausgebildet ist.
  6. Oberwerkzeug für eine Biegepresse nach Anspruch 1, dadurch gekennzeichnet, dass eine obere Fläche (9GF) der Eingriffsnut (9G) leicht nach unten von einer horizontalen Linie nach innen geneigt ist, um das Oberwerkzeug an die Stützplatte (7) zu drücken.
  7. Oberwerkzeug für eine Biegepresse nach Anspruch 1, dadurch gekennzeichnet, dass die geneigte Fläche (9S) des Oberwerkzeugs gehärtet wird, indem ein Hartmetall an der Oberfläche derselben angebracht wird.
  8. Oberwerkzeug für eine Biegepresse nach Anspruch 1, dadurch gekennzeichnet, dass die geneigte Fläche (9S) des Oberwerkzeugs gehärtet wird, indem ein Hartmetall auf die Oberfläche derselben aufgetragen wird.
  9. Oberwerkzeug für eine Biegepresse nach Anspruch 1 in Kombination mit der Haltevorrichtung (1), dadurch gekennzeichnet, dass eine Abmessung der geneigten Fläche (9S) in einer vertikalen Richtung, wenn ein oberer Vorsprungsabschnitt des Oberwerkzeugs mit dem Oberwerkzeug-Klemmelement (11) in Eingriff kommt, größer ist als ein Zwischenraum (H) zwischen einer unteren Endfläche (7E) des Halterkörpers (5) und einem Schulterabschnitt (9F) des Oberwerkzeugs (9).
  10. Oberwerkzeug für eine Biegepresse nach Anspruch 1 in Kombination mit der Haltevorrichtung (1), dadurch gekennzeichnet, dass das Oberwerkzeug (9) abnehmbar zwischen der Stützplatte (7) und dem Oberwerkzeug-Klemmelement (11) angebracht ist, wobei die Stützplatte (7) an einem unteren Teil eines Halterkörpers (5) in einem Oberwerkzeug-Halter (1) angeordnet ist, der an einer Unterseite des Obertischs (3) der Biegepresse angebracht ist, wobei das Oberwerkzeug-Klemmelement (11) schwenkbar an dem Halterkörper (5) angebracht und so aufgebaut ist, dass es in der Lage ist, das Oberwerkzeug (9) an die Stützplatte (7) zu pressen,
    die geneigte Fläche (9S) bewirkt, dass das Oberwerkzeug-Klemmelement (11) geschwenkt wird, um eine Klemmkraft des Oberwerkzeugs (9) aufgrund des Oberwerkzeug-Klemmelementes (11) zu vergrößern, wenn das Oberwerkzeug (9) in Bezug auf die Klemmplatte (7) angehoben wird, um die Kontaktfläche (9F) mit der unteren Endfläche der Stützplatte (107) in Kontakt zu bringen,
    wobei in einem Zustand, in dem eine obere Fläche der Eingriffsnut (9G), die in dem Oberwerkzeug (9) vorhanden ist, von einem Eingriffsvorsprung (11K) getragen wird, der in dem Oberwerkzeug-Klemmelement (11) vorhanden ist, ein Abstand H zwischen der unteren Endfläche (7E) der Trägerplatte (7) und der Kontaktfläche (9F) des Oberwerkzeugs (9) mit dem folgenden Ausdruck errechnet werden kann: H = (B2 • P) / (A2 • K • tan )
    wobei A einen Abstand zwischen einem Schwenkmittelpunkt des Oberwerkzeug-Klemmelementes (11) und einer elastischen Einrichtung zum Ausüben einer Klemmkraft auf das Oberwerkzeug-Klemmelement bezeichnet;
    B einen durchschnittlichen Abstand zwischen dem Schwenkmittelpunkt des Oberwerkzeug-Klemmelementes und einem Klemmkraft-Wirkpunkt bezeichnet;
    P die auf das Oberwerkzeug-Klemmelement wirkende Klemmkraft bezeichnet;
    K einen Elastizitätsmodul der elastischen Einrichtung bezeichnet;
    und  den Neigungswinkel der geneigten Fläche (9S) des Oberwerkzeugs gegenüber der vertikalen Linie bezeichnet.
  11. Oberwerkzeug für eine Biegepresse nach Anspruch 1 in Kombination mit der Haltevorrichtung (1), wobei das Oberwerkzeug (9) elastisch zwischen der Stützplatte (7) des Halterkörpers (5), der an einem unteren Abschnitts des Obertischs (3) angebracht ist, und dem Oberwerkzeug-Klemmelement (11) eingeklemmt wird, dadurch gekennzeichnet, dass die geneigte Fläche (9S) in Kontakt mit einer geneigten Fläche des Oberwerkzeug-Klemmelementes (11) gebracht wird, wenn das Oberwerkzeug zwischen dem Oberwerkzeug-Halterkörper (5) und dem Oberwerkzeug-Klemmelement (11) so eingeklemmt wird, dass die Klemmkraft weiter vergrößert werden kann, wenn das Oberwerkzeug mit einem Gesenk (63) in Eingriff gebracht wird.
  12. Oberwerkzeug und Haltevorrichtung (1) nach Anspruch 11, dadurch gekennzeichnet, dass eine untere Fläche (9GL) der Eingriffsnut (9G) des Oberwerkzeugs an einer Position ausgebildet ist, die vertikal höher liegt als eine Kontaktfläche (9F), die mit einer unteren Endfläche (7E) der Stützplatte (7) des Halterkörpers (5) in Kontakt gebracht wird.
  13. Oberwerkzeug und Haltevorrichtung (1) nach Anspruch 11, dadurch gekennzeichnet, dass ein Abstand (H) zwischen der unteren Fläche (7E) der Stützplatte (7) und einer oberen Fläche (7E) der Stützplatte (7) sowie einer oberen Fläche (9F) des Oberwerkzeugs (9), der entsteht, wenn die obere Fläche der Eingriffsnut (9G) des Oberwerkzeugs mit dem Eingriffsvorsprung (11K) des Oberwerkzeug-Klemmelementes (11) in Kontakt ist, wie folgt bestimmt wird: H = (B2•P)/(A2•K•tan )
    wobei A einen Abstand zwischen einem Schwenkmittelpunkt des Oberwerkzeug-Klemmelementes (11) und einer elastischen Einrichtung zum Ausüben einer Klemmkraft auf das Oberwerkzeug-Klemmelement bezeichnet;
    B einen durchschnittlichen Abstand zwischen dem Schwenkmittelpunkt des Oberwerkzeug-Klemmelementes und einem Klemmkraft-Wirkpunkt bezeichnet;
    P die auf das Oberwerkzeug-Klemmelement wirkende Klemmkraft bezeichnet;
    K ein Elastizitätsmodul der elastischen Einrichtung bezeichnet;
    und  den Neigungswinkel der geneigten Flächen (9S) des Oberwerkzeugs gegenüber der vertikalen Linie bezeichnet.
  14. Oberwerkzeug-Anordnung für eine Biegepresse, die ein Oberwerkzeug nach einem der Ansprüche 1 bis 8 und eine Oberwerkzeug-Haltervorrichtung zum Festklemmen eines Oberwerkzeugs (205) zwischen einem Oberwerkzeug-Stützabschnitt (209) eines Oberwerkzeug-Halterkörpers (207), der an einem unteren Abschnitt eines Obertischs (203) angebracht ist, und einem schwenkbaren Oberwerkzeug-Klemmelement (211) mit einer Klemmkraft-Erzeugungseinrichtung (213) umfasst, dadurch gekennzeichnet, dass:
    das schwenkbare Oberwerkzeug-Klemmelement (211) mit einem Eingriffsvorsprung (211P) versehen ist, der mit einer Fallverhinderungs-Nut (205G) in Eingriff ist, die in dem Oberwerkzeug (205) ausgebildet ist; und
    die Oberwerkzeug-Haltervorrichtung des Weiteren eine Klemmbetätigungs-Einrichtung (215) zum wahlweisen Bewegen an eine Klemmposition A, in der die Klemmkraft von der Klemmkraft-Erzeugungseinrichtung (213) auf das Oberwerkzeug-Klemmelement (211) ausgeübt werden kann, um das Oberwerkzeug festzuklemmen, eine Losklemm-Position B, in der die Klemmkraft verringert werden kann, um das Oberwerkzeug verstellbar horizontal zu verschieben und eine Austauschposition C in der das Oberwerkzeug-Klemmelement (211) von dem Oberwerkzeug weg bewegt werden kann, so dass das Oberwerkzeug vertikal gegen ein anderes ausgetauscht werden kann, umfasst.
  15. Oberwerkzeug-Anordnung für eine Biegepresse nach Anspruch 14, dadurch gekennzeichnet, dass die Klemmbetätigungs-Einrichtung (215) umfasst:
    ein Schiebeelement (259P), das die Klemmkraft-Erzeugungseinrichtung (213) schiebt, um die Klemmkraft der Klemmkraft-Erzeugungseinrichtung (213) zu erzeugen;
    einen Betätigungshebel (265); und
    eine Klemmkraft-Steuereinrichtung (263), die an dem Betätigungshebel angebracht ist und gesteuert mit dem Schiebeelement (259P) in Kontakt gebracht und von ihm getrennt wird, um die von der Klemmkraft-Erzeugungseinrichtung (213) auf das Oberwerkzeug ausgeübte Klemmkraft zu steuern.
  16. Oberwerkzeug-Anordnung für eine Biegepresse nach Anspruch 14, dadurch gekennzeichnet, dass die Oberwerkzeug-Haltervorrichtung des Weiteren eine Oberwerkzeug-Klemmelement-Drückeinrichtung (217) umfasst, die das Oberwerkzeug-Klemmelement (211) leicht in Klemmrichtung drückt, wenn die Klemmbetätigungs-Einrichtung (215) an die Austauschposition C bewegt wird.
  17. Oberwerkzeug-Anordnung für eine Biegepresse nach Anspruch 16, dadurch gekennzeichnet, dass die Oberwerkzeug-Klemmelement-Drückeinrichtung (217) wenigstens eine Schraubenfeder ist, die zwischen dem Oberwerkzeug-Klemmelement (211) und dem Oberwerkzeug-Halterkörper (207) angeordnet ist.
  18. Oberwerkzeug-Anordnung für eine Biegepresse nach Anspruch 15, dadurch gekennzeichnet, dass die Klemmkraft-Steuereinrichtung, die an dem Betätigungshebel (265) angebracht ist, eine Druckschraube (263) ist, die an dem Betätigungshebel befestigt und in Gewindeeingriff mit dem Oberwerkzeug-Klemmelement (211) ist, wobei die Druckschraube in Bezug auf das Oberwerkzeug-Klemmelement (211) verschoben wird, wenn sie durch den Betätigungshebel gedreht wird.
  19. Oberwerkzeug-Anordnung für eine Biegepresse nach Anspruch 14, dadurch gekennzeichnet, dass die Oberwerkzeug-Haltevorrichtung des Weiteren eine Klemmlöse-Halteeinrichtung (219) umfasst, die das Oberwerkzeug-Klemmelement (211) in einem Klemmkraft-Lösezustand hält, um einen Oberwerkzeug-Austauschraum zwischen dem Oberwerkzeug-Stützabschnitt (209) in dem Zustand auszubilden, in dem sich die Klemmbetätigungs-Einrichtung (215) in der Austauschposition C befindet.
  20. Oberwerkzeug-Anordnung für eine Biegepresse nach Anspruch 19, dadurch gekennzeichnet, dass die Klemmlöse-Halteeinrichtung (219) umfasst:
    eine Eingriffsaussparung (279), die in dem Oberwerkzeug-Klemmelement (211) ausgebildet ist; und
    einen Kolben (218), der an dem Halterkörper (207) angebracht ist und mit der Eingriffsaussparung in Eingriff kommt, wenn das Oberwerkzeug-Klemmelement (211) von dem Oberwerkzeug-Stützabschnitt (209) weg geschwenkt wird.
  21. Oberwerkzeug-Anordnung für eine Biegepresse nach Anspruch 15, dadurch gekennzeichnet, dass die Oberwerkzeug-Haltervorrichtung des Weiteren zwei Klemmbetätigungs-Hebel-Stoppeinrichtungen (271) umfasst, die den bewegten Klemmbetätigungs-Hebel (265) in der Losklemm-Position B bzw. der Austauschposition C stoppen.
  22. Oberwerkzeug-Anordnung für eine Biegepresse nach Anspruch 21, dadurch gekennzeichnet, dass jede der Klemmbetätigungs-Hebel-Stoppeinrichtungen (217) umfasst:
    einen Zapfen (275), der an einer Seitenfläche eines Schlitzes (273) angebracht ist, der in einer Anbringungsplatte (225) ausgebildet ist;
    ein Anschlagelement (271), das schwenkbar von dem Zapfen so getragen wird, dass es von einer Fläche der Anbringungsplatte aus vorsteht oder eingezogen ist; und
    einen Kolben (277), der an der Anbringungsplatte angebracht ist, um den Anschlag in der vorstehenden bzw. eingezogenen Position zu halten.
  23. Oberwerkzeug-Anordnung nach Anspruch 14, dadurch gekennzeichnet, dass die Oberwerkzeug-Haltervorrichtung des Weiteren umfasst:
    ein Keilstück (247), das über dem Eingriffsvorsprung (211P) angebracht ist, der in dem Oberwerkzeug-Klemmelement (211) ausgebildet ist, um mit der Fallverhinderungs-Nut (205G) in Eingriff zu kommen, die in dem Oberwerkzeug (205) ausgebildet ist; und
    eine Schraubenfeder (249), die das Keilstück in einer Richtung drückt, in der das festgeklemmte Oberwerkzeug in einer Klemmrichtung gedrückt werden kann.
  24. Oberwerkzeug-Anordnung für eine Biegepresse, die ein Oberwerkzeug nach einem der Ansprüche 1 bis 8 und eine Oberwerkzeug-Haltervorrichtung zum Einklemmen des Oberwerkzeugs (305) zwischen einem Oberwerkzeug-Stützabschnitt (313) eines Oberwerkzeug-Körpers (301), der an einem unteren Abschnitt eines Obertischs (303) angebracht ist, und einem Oberwerkzeug-Klemmelement (309) mit einem Befestigungselement (327) umfasst, dadurch gekennzeichnet, dass das Oberwerkzeug (305) mit einem Befestigungselement (327) eingeklemmt wird, das mit einem elastischen Element (329) zusammenwirkt, um das Oberwerkzeug zwischen dem Oberwerkzeug-Stützabschnitt (313) und dem Oberwerkzeug-Klemmelement (309) elastisch einzuklemmen, wobei das elastische Element (329) zwischen dem Oberwerkzeug-Klemmelement (309) und dem Befestigungselement (327) angeordnet ist.
  25. Oberwerkzeug-Anordnung für eine Biegepresse nach Anspruch 24, dadurch gekennzeichnet, dass das Oberwerkzeug-Klemmelement (309) mit einer geneigten Fläche (309F) versehen ist, die an einem oberen Abschnitt derselben nach unten verbreitert ist und mit einer geneigten Fläche (305F) eines Oberwerkzeugs (305) in Kontakt gebracht wird, wenn das Oberwerkzeug zwischen dem Oberwerkzeug-Stützabschnitt (313) und dem Oberwerkzeug-Klemmelement (309) so eingeklemmt wird, dass die Klemmkraft weiter vergrößert werden kann, wenn das Oberwerkzeug mit einem Gesenk (363) in Eingriff gebracht wird.
  26. Oberwerkzeug-Anordnung für eine Biegepresse nach Anspruch 24, dadurch gekennzeichnet, dass die Befestigungseinrichtung (327) aus einem Gewindeabschnitt (327S), der in Gewindeeingriff mit dem Oberwerkzeug-Halterkörper (313) ist, und einem zylindrischen Körperabschnitt (327B) besteht, der einen konstanten Raum zum Anordnen des Oberwerkzeug-Klemmelementes (309) und des elastischen Elementes (329) bestimmt.
  27. Oberwerkzeug-Anordnung für eine Biegepresse nach Anspruch 24, dadurch gekennzeichnet, dass das Oberwerkzeug-Klemmelement (309) mit einem Eingriffsvorsprung (309P) versehen ist, der mit einer Eingriffsnut (305F) in Eingriff kommt, die in dem Oberwerkzeug (305) ausgebildet ist.
  28. Oberwerkzeug-Anordnung für eine Biegepresse nach Anspruch 24, dadurch gekennzeichnet, dass die rechte und die linke Seitenkante (309C) des Oberwerkzeug-Klemmelementes (309) abgeschrägt sind, um das Einführen des Oberwerkzeugs zwischen den Oberwerkzeug-Stützabschnitt (313) und das Oberwerkzeug-Klemmelement (309) zu erleichtern.
  29. Verfahren zum Festklemmen eines Oberwerkzeugs (305) mit einer Oberwerkzeug-Anordnung nach Anspruch 24 zwischen einem Oberwerkzeug-Halterkörper (307), der an einem Obertisch (303) einer Biegepresse angebracht ist, und einem Oberwerkzeug-Klemmelement (309) durch eine elastische Klemmkraft eines elastischen Elementes, das die folgenden Schritte umfasst:
    Befestigen eines Befestigungselementes (327), um das Oberwerkzeug-Klemmelement (309), das mit einer geneigten Fläche (309F) versehen ist, an einer konstanten Befestigungsposition in Bezug auf den Oberwerkzeug-Halterkörper (307) auf den Oberwerkzeug-Halterkörper (307) zu zu drücken;
    Einführen des Oberwerkzeugs (305), das mit einer geneigten Fläche (305F) versehen ist, in den vorgegebenen Raum von unten, und zwar so, dass die geneigte Fläche (305F) des Oberwerkzeugs mit der geneigten Fläche (309F) des Klemmelementes in Kontakt gebracht wird; und
    Herstellen von Eingriff des Oberwerkzeugs (305) mit einem Gesenk (327), indem entweder das Oberwerkzeug oder das Gesenk so bewegt werden, dass das Oberwerkzeug in Bezug auf den Oberwerkzeug-Halterkörper (307) nach oben bewegt wird, um so ein elastisches Element (329), das sich zwischen dem Befestigungselement (327) und dem Oberwerkzeug-Klemmelement (309) befindet, aufgrund einer Keilwirkung zwischen den zwei geneigten Flächen des Oberwerkzeugs (305) und des Oberwerkzeug-Klemmelementes (309) stets mit einem konstanten Zusammendrückverhältnis zusammenzudrücken, so dass das Oberwerkzeug (305) zwischen dem Oberwerkzeug-Halterkörper (307) und dem Oberwerkzeug-Klemmelement (309) stets mit einer konstanten Klemmkraft eingeklemmt werden kann.
EP95401135A 1994-05-17 1995-05-16 Oberwerkzeug und Oberwerkzeugträger mit einem solchen Oberwerkzeug zur Verwendung mit einer Biegepresse und Verfahren zur Befestigung des Oberwerkzeuges Expired - Lifetime EP0682995B1 (de)

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EP01123583A EP1213062B1 (de) 1994-05-17 1995-05-16 Oberwerkzeug und Oberwerkzeugzusammenbau für eine Biegepresse und Verfahren zum Spannen des Oberwerkzeuges

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JP10270094 1994-05-17
JP10270094 1994-05-17
JP102700/94 1994-05-17
JP149785/94 1994-06-30
JP6149785A JP2747224B2 (ja) 1994-06-30 1994-06-30 プレスブレーキの上型ホルダ
JP14978594 1994-06-30
JP19543494 1994-08-19
JP6195434A JP2740125B2 (ja) 1994-08-19 1994-08-19 プレスブレーキにおける上型ホルダ装置
JP195434/94 1994-08-19

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EP95401135A Expired - Lifetime EP0682995B1 (de) 1994-05-17 1995-05-16 Oberwerkzeug und Oberwerkzeugträger mit einem solchen Oberwerkzeug zur Verwendung mit einer Biegepresse und Verfahren zur Befestigung des Oberwerkzeuges

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CN110479808A (zh) * 2019-09-23 2019-11-22 江苏弘东工业自动化有限公司 折弯机用手动夹块
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KR100377710B1 (ko) 2003-06-25
DE69528684D1 (de) 2002-12-05
SG38842A1 (en) 1997-04-17
CN1063989C (zh) 2001-04-04
KR950031491A (ko) 1995-12-18
TW365857U (en) 1999-08-01
MY114880A (en) 2003-02-28
EP0682995A1 (de) 1995-11-22
DE69535526T2 (de) 2008-03-06
CN2312084Y (zh) 1999-03-31
CN1125647A (zh) 1996-07-03
EP1213062A3 (de) 2005-02-02
EP1213062A2 (de) 2002-06-12
EP1213062B1 (de) 2007-06-27
DE69535526D1 (de) 2007-08-09
DE69528684T2 (de) 2003-07-10

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