JP3004597U - Upper mold for press brake - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an upper die for a press brake that can be easily attached to and detached from the upper die holder device 1. In order to achieve the above object, in an upper die for a press brake, the clamping force of the upper die is gradually increased by relatively moving an operating member provided in an upper die holder device of the press brake. The mechanism is provided with a push-up operation portion for performing a push-up operation of the operation member which is vertically movable. The push-up operation portion is formed on the lower surface of the lateral engaging groove formed on the front surface or the rear surface of the upper die, and this engaging groove is substantially equal to the holder contact surface of the shoulder portion formed on the upper die. It is provided between the height position and a height position slightly lower than the upper end of the upper mold.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an upper mold that is detachably attached to an upper mold holder device in a press brake, and more specifically, operates the upper mold holder device to increase a clamping force when the upper mold is mounted on the upper mold holder device. Regarding upper mold that can be done.

[0002]

[Prior art]

 As is well known, the press brake has an upper table (sometimes referred to as an upper apron) and a lower table (sometimes referred to as a lower apron) that are vertically opposed to each other. This is a structure in which one of the upper table and the lower table is appropriately driven as a ram.

In the press brake, an upper die is attached to the lower portion of the upper table and a lower die is attached to the upper portion of the lower table in order to perform bending of a plate-shaped work. .

In the above structure, the movable table is moved up and down to engage the upper die and the lower die, thereby bending the workpiece located between the upper die and the lower die. It is something that is seen.

In the press brake, for example, in order to replace the upper mold according to the bent shape of the work, etc., a large number of upper mold holders are attached to the lower part of the upper table, and the upper mold can be attached and detached by the large number of upper mold holders. It is a structure to support.

In the conventional upper die holder, the upper die clamp is attached to the holder main body attached to the lower part of the upper table, and the upper die clamp is tightened with the tightening bolts. The upper part of the mold is strongly clamped and fixed.

Therefore, conventionally, in order to attach / detach the upper die to / from the upper table, it is necessary to operate a large number of tightening bolts provided in a large number of upper die holders, and the operation is extremely cumbersome and troublesome. There was a problem.

Therefore, an upper die holder device has been developed in which an air cylinder is attached to the upper die holder, and the upper die clamp is tightened and released by the air cylinder.

[0009]

[Problems to be solved by the device]

 In the upper die holder device having the above-mentioned configuration, a large number of upper die holder devices must be provided with air cylinders, respectively, and an air source is required. Therefore, there is a problem that the configuration becomes complicated and expensive.

Further, in the conventional upper die holder device, when the upper die clamp is released by the upper die clamp provided in the upper die holder device, there is a risk that the upper die may drop.

Further, in the conventional upper die holder device, when the upper die is mounted, the upper die clamp is lightly tightened so that the upper die does not drop, and then the lower die and the upper die are aligned with each other. There is a problem that the upper die clamp must be tightened strongly and the operation is troublesome.

Note that, as a precedent example that is considered to be related to the present invention, there is, for example, EP038712 1A1.

In this prior art, the upper die is clamped between the holder main body and the upper die clamp swingably pivotally attached to the upper table of the press brake. This is a structure in which the upper die is rotated continuously so as to avoid the pivot about which the upper die clamp is pivotally attached, and there is a problem that the shape of the upper die becomes special.

The present invention has been made in view of the conventional problems as described above, and an object thereof is to enable easy attachment / detachment / replacement of the upper mold and release the upper mold. Another object is to provide a removable upper mold for the upper mold holder device in which the upper mold does not drop.

[0015]

[Means for Solving the Problems]

 In view of the conventional problems as described above, the upper die for the press brake according to the present invention has a clamping force of the upper die due to the relative movement of the operating member provided in the upper die holder device of the press brake. In the gradually increasing clamp force increasing mechanism, there is provided a pushing-up actuating portion for pushing up the actuating member which is vertically movable.

Further, the push-up operation portion is formed on the lower surface of the lateral engaging groove formed on the front surface or the rear surface of the upper die.

Further, the push-up operation portion is formed on the lower surface of the engaging groove in the left-right direction formed on the front surface or the rear surface of the upper die, and the upper surface of the engaging groove is engageable with a part of the operating member. is there.

Further, the push-up operation portion is formed on the lower surface of the lateral engaging groove formed on the front surface or the rear surface of the upper die, and the engaging groove is abutting against the holder of the shoulder portion formed on the upper die. It is provided between a height position approximately equal to the surface and a height position slightly lower than the upper end of the upper mold.

In addition, in the clamp force increasing mechanism in which the clamp member of the upper die holder device of the press brake is relatively raised, the clamp force of the upper die is gradually increased. And a push-up actuating portion formed on the lower surface of the engaging groove having a rectangular cross section formed on the front surface or the rear surface of the upper die, and the upper surface of the engaging groove is The engaging member is engageable with the rectangular section of the operating member, and the vertical width dimension of the engaging groove is slightly larger than the vertical dimension of the rectangular section section of the operating member.

[0020]

[Action]

 In the above-mentioned configuration, when the operating member of the upper die holder device is relatively pushed up by the upper operating portion of the press brake upper die, the clamping force of the clamping force gradual increase mechanism gradually increases to ensure the upper die clamping. Done.

Therefore, the upper die can be easily attached to the upper die holder device without using a tool.

[0022]

【Example】

 In order to facilitate understanding, the overall structure of the upper die holder device 1 which is the subject of the present invention will be described first.

Referring to FIGS. 1 and 2, the upper die holder device 1 according to the present embodiment is detachably attached to a lower portion of an upper table 3 in a press break (not shown).

The upper die holder device 1 presses the upper portion 9U of the upper die 9 against the holder body 5 which is detachably attached to the upper table 3 and the support plate 7 which is integrally provided on the lower portion of the holder body 5. An upper mold clamp 11 that is swingably attached to the holder body 5 for fixing, a clamp force adjusting device 13 that can adjust the clamping force of the upper mold clamp 11, and a clamp for the upper mold 9 by the upper mold clamp 11. A clamp releasing device 15 which can be released, and a wedge-shaped member 17 provided on the lower part of the upper die clamp 11 so as to be vertically movable relative to each other, and an appropriately shaped engaging portion 9K provided on the upper die 9. This is a configuration in which a locking portion 17K that can be engaged and disengaged is provided.

More specifically, the holder body 5 has a state in which the thin support plate 7 is integrally provided below the thick upper block portion 5B in the front-rear direction (left-right direction in FIG. 2). . On the front surface (left side surface in FIG. 2) of the upper block 5B of the holder body 5, a mounting plate 21 protruding upward is attached via a plurality of bolts 19 (see FIG. 1).

The mounting plate 21 is brought into contact with the lower portion of the front surface of the upper table 3, and the clamp jaws 25 are tightened by the tightening bolts 23 screwed to the upper table 3 to press the mounting plate 21 against the upper table 3. Thus, the holder body 5 can be attached to the upper table 3.

In order to adjust the vertical position of the holder body 5, a wedge member 27 is interposed between the upper surface of the holder body 5 and the lower surface of the upper table 3, and the wedge member 27 has a front portion. A fixing bolt 31 penetrating through a long hole 29 (see FIG. 1) in the left-right direction provided in the mounting plate 21 is screwed.

In the above-mentioned structure, the wedge member 27 is held in the left-right direction in FIG. The holder body 5 can be finely adjusted up and down with respect to the upper table 3 by adjusting.

The upper die clamp 11 is made of a plate-shaped member having a width substantially the same as the width of the holder body 5 in the left-right direction, and is located between the support plate 7 and the upper die 9 U of the upper die 9. Is rotatably mounted on the holder main body 5 so as to press the support plate 7 to fix it.

More specifically, the upper mold clamp 11 has a plurality of through holes 11H provided at substantially the center of the upper mold clamp 11 in the vertical direction and is horizontally screwed and fixed to the support plate 7 through the through holes 11H. It is supported by a mounting bolt 33 so as to be swingable in the front-rear direction. In order that the upper die clamp 11 can be swung easily, spherical seats 35 are respectively interposed between the heads of the mounting bolts 33 and the upper die clamp 11. Further, between the upper clamp 11 and the support plate 7, there is mounted a coil spring 37 which acts to separate them from each other.

An inclined surface 11S is formed at a lower portion of the upper die clamp 11 so that an upper side thereof approaches the support plate 7 side, and the wedge-shaped member 17 is relatively disposed on the inclined surface 11S. It is mounted so that it can move up and down.

More specifically, vertical slots 11LH are provided on the left and right sides of the lower end of the upper clamp 11, and the mounting bolts are screwed to the wedge-shaped member 17 through the slots 11LH. A wedge-shaped member 17 is attached to the upper die clamp 11 so as to be vertically movable by interposing 39.

Then, the engaging groove in the left-right direction as the engaging portion 9K formed on the upper mold 9 and the engaging portion 17K that can be engaged and disengaged are formed to project at appropriate positions of the wedge-shaped member 17. . In other words, the engaging portion 17K is a protruding portion that protrudes from the wedge member, and its cross-sectional shape is rectangular, as is clear from FIG.

The upper die clamp 11 applies a clamping force for pressing and clamping the upper die 9 to the support plate 7, and the clamping force adjusting device 13 for adjusting the clamping force is provided in the upper block portion. It is installed inside a horizontal hole 5H provided in 5B.

More specifically, as shown in FIG. 2, the clamping force adjusting device 13 includes a nut member screwed to the adjusting screw 41 to adjust the position of the ring member 43 movably fitted to the adjusting screw 41. 45 and an elastic member 47 such as a spring mounted between the head 41H of the adjusting screw 41 and the ring member 43.

In the above-described configuration, the accumulating force of the elastic member 47 can be adjusted by adjusting the screwing position of the nut member 45 with respect to the adjusting screw 41 to adjust the compression of the elastic member 47.

The head 41H of the adjusting screw 41 in the clamping force adjusting device 13 is in contact with the inner wall of the hole 5H, and the ring member 43 has a cylindrical pressing member 49 including a nut member 45. Are in contact.

The tip of the tightening screw 51 in the clamp releasing device 15 provided on the upper die clamp 11 is in contact with the pressing member 49. More specifically, the clamp releasing device 15 is composed of the above-mentioned tightening screw 51 that is screwed through the upper part of the upper die clamp 11, and the lever 53 is integrally formed with this tightening screw 51. It is installed.

Therefore, by operating the lever 53, the tightening screw 51 can be tightened and the tightening screw 51 can be loosened. Left and right stopper pins 55 are attached to the attachment plate 21 in order to limit the operation range (rotation range) of the lever 53.

With the above-described structure, as shown in FIG. 2, when the upper portion 9U of the upper die 9 is located between the support plate 7 of the holder body 5 and the upper die clamp 11, When the lever 53 of the releasing device 15 is rotated to the position R in the right direction in FIG. 1 and the tightening screw 51 is tightened, the elastic member 47 of the clamping force adjusting device 13 is further compressed, and the elastic member 47 is formed. The accumulated force of the upper mold 9 increases, and the reaction force of the accumulated force causes the upper mold clamp 11 to more firmly clamp and fix the upper mold 9.

On the contrary, when the lever 53 is rotated to the position L in the left direction in FIG. 1 to loosen the tightening screw 51, the upper mold clamp 11 releases the tightening fixation of the upper mold 9. Become.

As described above, when the upper mold 9 is clamped and fixed by the upper mold clamp 11 by operating the lever 53, the upper mold clamp 11 is moved in the left-right direction in FIG. Rock to.

In order to guide the swing of the upper die clamp 11 and to restrict the upward movement of the upper die clamp 11, as shown in FIG. The restriction piece 57 is attached to the holder body 5 with a bolt 59.

Therefore, the upper die clamp 11 clamps and fixes the upper die 9 at a fixed position without moving up and down.

As shown in FIG. 2, the upper mold 9 that is attached to and detached from the upper mold holder device 1 having the above-described configuration includes a contact surface 9F that contacts the lower end surface 7E of the support plate 7. There is. The upper portion 9U is a portion projecting upward from the contact surface 9F, and the upper portion 9U is provided with a sliding contact surface 9S slidably contacting the front surface or the rear surface of the support plate 7. An engaging groove as the engaging portion 9K is formed on the surface opposite to the sliding contact surface 9S.

Further, the upper die 9 is provided with a work processing portion 9M for bending the work W in cooperation with the lower die 63 mounted on the lower table 61 of the press brake at the lower end portion.

As is apparent from FIG. 2, the engagement groove as the engagement portion 9K has an upper surface as an engagement surface that is engageable with an upper surface of the protrusion 17K of the wedge member 17 and the protrusion 17K. It has a rectangular cross section in which a lower surface serving as a push-up operation portion or a wedge member pushing-up portion for lowering the lower surface is opposed and parallel to each other, and the distance between the upper surface and the lower surface of the engaging groove 9K is determined. Is provided slightly larger than the vertical dimension of the protrusion 17K.

That is, although the protrusion 17K of the wedge member 17 and the engagement groove 9K of the upper die 9 can be easily engaged, the relative vertical movement of the wedge member 17 and the upper die 9 may be too large. In order to prevent this, the vertical dimension of the engaging groove 9K is formed slightly larger than the vertical dimension of the protrusion 17K.

In the above configuration, when the upper die 9 is removed from the upper die holder device 1, the following operation is performed to attach the upper die 9 to the upper die holder device 1.

First, the lever 53 of the clamp release device 15 is rotated to the position R to hold the tightening screw 51 in the tightened state. As described above, even when the tightening screw 51 is tightened, the support plate 7 and the lower wedge-shaped member 17 of the upper die clamp 11 are in an open state, and the wedge-shaped member 17 is relatively moved by its own weight. It is descending.

Therefore, the upper portion 9U of the upper die 9 is inserted from the left and right direction between the support plate 7 and the upper die clamp 11, and the engagement groove (engaging portion) 9K formed in the upper die 9 is wedge-shaped. It is hooked on the locking portion (protruding portion) 17K of the member 17.

After that, the movable side of the upper and lower tables 3 and 61 in the press brake is moved up and down to engage the upper die 9 and the lower die 63, so that the upper die 9 rises relative to the holder body 5. To be done.

When the upper die 9 gradually rises relative to the holder body 5 as described above, the lower surface of the protruding portion 17K of the wedge member 17 is pushed up by the lower surface of the engaging groove 9K of the upper die 9. Therefore, the wedge-shaped member 17 also rises integrally. Therefore, the upper die clamp 11 is gradually rotated in the counterclockwise direction in FIG. 2 and gradually compresses the elastic member 47 in the clamping force adjusting device 13.

Therefore, when the upper die 9 relatively rises and the abutment surface 9F abuts on the lower end surface 7E of the support plate 7, the upper die clamp 11 is acted on by the accumulating force of the elastic member 47. The upper mold 9U is firmly clamped.

Therefore, the upper die 9 can be easily attached to the upper die holder device 1.

As described above, after mounting the upper mold 9 on the upper mold holder device 1, in order to remove the upper mold 9 from the upper mold holder device 1, the lever 53 is rotated to the position L on the left side, As described above, loosen the tightening with the tightening screw 51. When the tightening screw 51 is loosened as described above, the upper mold clamp 11 releases the upper mold 9 from being clamped.

When the clamping of the upper die 9 by the upper die clamp 11 is released as described above, the upper die 9 and the wedge-shaped member 17 are lowered to their original lowered position by their own weight. In this case, since the upper surface of the engaging portion 9K of the upper die 9 is hooked on the engaging portion 17K of the wedge-shaped member 17, the upper die 9 does not drop and is safe.

In this way, by moving the upper mold 9 in the left-right direction when the upper mold 9 is released from the tightening fixation of the upper mold 9, the upper mold holder device 1 is moved to move the upper mold 9 from the upper mold 9. It can be removed.

As will be understood, according to the above-described embodiment, the upper die 9 can be easily attached / detached to / from the upper die holder device 1 with a simple structure without using any tool or the like. It is something you can do.

As already understood, when the protrusion 17K of the wedge member 17 is pushed up by the lower surface of the engagement groove 9K in the upper mold 9, the upper mold clamp 11 clamps the upper mold 9 to the support plate 7. Since the force (pressing force) is gradually increased, for example, in the wedge member 17, the upper die clamp 11, the clamp force adjusting device 13, etc., the wedge member 17 as an operating member is relatively raised. This constitutes a kind of clamping force increasing mechanism in which the clamping force gradually increases.

As a part of the configuration of the clamping force gradually increasing mechanism, the clamping force adjusting device 13 including the elastic member 47 is provided. Instead of the clamping force adjusting device 13, a compressible fluid (gas) is internally provided. It is also possible to employ a fluid pressure cylinder. It is also possible to configure the upper die clamp 11 itself by a leaf spring, omit the clamp adjusting device 13, and use the elastic deformation of the upper die clamp 11.

That is, various structures can be adopted as the clamping force gradually increasing mechanism of the upper die holder device.

FIG. 3 shows a second embodiment of the present invention. In the second embodiment, the engaging portion 17K of the wedge-shaped member 17 is formed in a groove shape, and the engaging portion 9K of the upper die 9 is formed. Is formed on the protrusion. That is, the wedge member 17 is pushed up by the protrusion 9K of the upper mold 9.

The other structure is the same as that of the first embodiment described above.

The second embodiment also has the same effect as that of the first embodiment.

FIG. 4 shows a third embodiment. In this embodiment, a protrusion 17P is formed on the upper part of the wedge-shaped member 17, and the protrusion 17P is brought into contact with the upper surface of the upper mold 9 to The configuration is such that the wedge member 17 is pushed up by the upper surface of 9, and the other configurations are the same as those of the first embodiment.

Also in the third embodiment, the same effect as that of the above-mentioned embodiment is obtained.

FIGS. 5 to 7 show a fourth embodiment of the upper mold holder 1 according to the present invention. The upper mold 9 can be mounted on the rear surface side of the support plate 7 by reversing the front and rear of the upper mold 9. It is composed.

Therefore, the parts having the same functions as those of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. Only the differences from the first embodiment will be described.

In order to mount the upper mold 9 on the rear surface side of the support plate 7, a rear upper mold clamp 65 is mounted on the rear surface of the support plate 7.

More specifically, on the rear surface of the support plate 7 of the holder body 5, as shown in FIG. 7, a stud 67 having a hemispherical head portion 67H is horizontally mounted by a mounting bolt 69, The upper clamp 65 is swingably supported on the stud 67.

In order to operate the mounting bolt 69, a tool hole 11T is formed in the front upper mold clamp 11, and a head 65H of the stud 67 has a groove 65G formed in the upper mold clamp 65. A detent pin 71 engaged with is attached. Therefore, when the mounting bolt 69 is rotated, the stud 67 does not rotate.

In order to use the clamping force adjusting device 13 for both the upper mold clamp 11 on the front side and the upper mold clamp 65 on the rear side, a small diameter hole 73 is formed in the inner wall of the hole 5H of the holder body 5. There is. An abutting member 75 attached to the upper part of the rear upper clamp 65 penetrates the small diameter hole 73 and abuts on the head 41H of the adjusting screw 41.

A ring nut 77 that restricts the pressing member 49 of the clamping force adjusting device 13 is screwed on the inlet side of the hole 5H.

In the above structure, by tightening the mounting bolts 69, the upper mold 9 on the rear side can firmly press and fix the upper mold 9 to the rear side surface of the support plate 7. On the contrary, by loosening the mounting bolt 69, the clamp of the upper die 9 by the upper die clamp 65 on the rear side is released.

The lever 53 is operated by holding an appropriate inclusion between the upper mold clamp 11 on the front side and the support plate 7 and holding the upper mold clamp 11 in a stationary state. Then, the upper mold 9 may be clamped and fixed by the upper mold clamp 65 on the rear side and fixedly released.

That is, in the fourth embodiment, the upper die 9 can be inverted and selectively mounted before and after the support plate 7 in accordance with the bending shape of the work and the like. The upper die 9 can be easily attached to and detached from the die holder device 1.

As can be understood from the above description of the embodiments, according to the present invention, the upper mold 9 can be easily attached / detached to / from the upper mold holder device 1 with a simple structure, and The upper die 9 does not drop when the upper die 9 is released from the upper die holder device 1, and the safety is further improved.

By the way, as described above, by moving the upper die 9 relatively upward with respect to the support plate 7 in the upper die holder apparatus 1 and pushing up the wedge member 17 as an operating member, the upper die is operated. Since the clamping force of the clamp 11 is gradually increased, it is necessary that a sufficiently large clamping force be obtained when the contact surface 9F of the upper die 9 contacts the lower end surface 7E of the support plate 7. Is.

Therefore, as schematically shown in FIG. 8, the lower surface of the engaging groove 9K as the wedge member pushing-up portion of the upper die 9 is in a state of lightly contacting the lower surface of the protruding portion 17K of the wedge member 17. At this time, the distance between the lower end surface 7E of the support plate 7 and the contact surface 9F of the upper die 9 is H; the elasticity of the clamp force adjusting device 13 that presses the upper die clamp 11 from the rotation center of the upper die clamp 11. The dimension up to the means 47 is A; the average dimension from the center of rotation to the pressing portion where the upper die clamp 11 presses the upper die 9 against the support plate 7 through the wedge member 17 is B; the upper die 9 is a support plate It is desirable that the dimension H is a dimension represented by the following equation, where P is the pressing force for pressing the elastic member 47, K is the elastic coefficient of the elastic means 47, and θ is the inclination angle of the wedge member 17.

H = (B ² · P) / (A ² · K · tan θ) Here, as the upper mold 9 rises relatively to the support plate 7, as shown in FIG. The lower part of the clamp 11 is displaced by ΔL and the upper part thereof is displaced by ΔX to compress the elastic member 47, and a clamping force is obtained.

Therefore, when the dimension H is smaller than the dimension represented by the above equation, the contact surface 9F of the upper die 9 contacts the lower end surface 7E of the support plate 7 due to the relative slight rise of the upper die 9. Since they come into contact with each other and a sufficient clamping force cannot be obtained, the upper mold 9 may be dropped, which is not desirable.

On the contrary, when the dimension H is larger than the dimension represented by the above equation, the displacement amount of the elastic member 47 when the contact surface 9F of the upper mold 9 contacts the lower end surface 7E of the support plate 7. Is larger than ΔX, and a large clamping force can be obtained, but when attempting to release the clamp of the upper mold 9 by operating the lever 53 described above, it may not be possible to fully release it, and It may be difficult to attach and detach the mold 9, which is not desirable.

FIG. 9 shows still another embodiment of the upper die holder device and the upper die.

The actuating member 103P provided in the upper die holder apparatus 101 according to this embodiment is movable upward and downward in the clamp force gradually increasing mechanism 105 in which the clamping force of the upper die 9 is gradually increased by relatively raising the operating member 103P. The upper die 9 is provided with a push-up operation unit 107 for performing the push-up operation of 103P.

More specifically, the upper die clamp 111 for pressing and fixing the upper portion 9U of the upper die 9 to the support plate 109 of the upper die holder device 101 is swingably supported by the support plate 109 via the pin 113. ing.

A tip end of a piston rod 115P, which is reciprocally provided in a clamp cylinder 115 mounted on a support plate 109, is appropriately connected to an upper portion of the upper clamp 111. An operating cylinder 103 having a piston rod as the operating member 103P is connected to the clamp cylinder 115.

A check valve CV, an opening / closing valve V, and an accumulator ACC are connected to the connection circuit that connects the operating cylinder 103 and the clamp cylinder 115.

Therefore, in this embodiment, after the upper portion 9U of the upper die 9 is positioned between the support plate 109 and the upper die clamp 111, the actuating member 103P is provided by the push-up actuating portion 107 provided in the upper die 9. Is pushed up, the working fluid in the working cylinder 103 is supplied to the inside of the clamp cylinder 115 via the check valve CV, and the piston rod 115P of the working fluid projects to rotate the upper die clamp 111 counterclockwise. , The upper part 9U of the upper mold 9 is pressed and fixed to the support plate 109.

FIG. 10 shows still another embodiment. In this embodiment, the upper surface of the upper portion 9U of the upper die 9 is used as a push-up operation portion, and a rod-like operation that can be moved up and down with this upper surface is provided. By pushing up the member 121 and pushing up the wedge member 125 via the elastic member 123 provided on the operating member 121, the upper die clamp 111 is rotated counterclockwise in FIG. This is a configuration in which the mold 9 is pressed and fixed to the support plate 109.

[0091]

[Effect of device]

 As will be understood from the above description of the embodiments, in short, the present invention is based on a clamp force in which the upper mold clamping force is gradually increased by relatively raising the operating member provided in the upper mold holder device of the press brake. Since the gradual increase mechanism is provided with a push-up operation section for pushing up and down the above-mentioned movable operation section member, no tool is required when mounting the upper die to the upper die holder device, and the upper die It is possible to reliably perform the clamping.

That is, the upper mold may be provided with a push-up operation portion for performing the push-up operation of the operating member, and the shape of the upper mold does not need to be a special shape.

Since the push-up operation portion is formed on the lower surface of the lateral engagement groove formed on the front surface or the rear surface of the upper mold, the push-up operation portion can be easily formed.

Further, the push-up operation portion is formed on the lower surface of the lateral engaging groove formed on the front surface or the rear surface of the upper die, and the upper surface of the engaging groove is engageable with a part of the operating member. Therefore, both the upper surface and the lower surface of the engaging groove are effectively used, and the structure is not wasted.

Further, the push-up operation portion is formed on the lower surface of the lateral engaging groove formed on the front surface or the rear surface of the upper die, and this engaging groove is abutting against the holder of the shoulder portion formed on the upper die. Since it is provided between a height position almost equal to the surface and a height position slightly lower than the upper end of the upper mold, it is possible to rotate the upper mold when pressing and fixing it to the support plate by the upper mold clamp. The upper part of the upper mold can be securely clamped and fixed without a moment acting.

Further, the operating member provided in the upper die holder device of the press brake is relatively moved upward to increase the clamping force of the upper die gradually. The push-up operation portion for performing push-up operation is provided, and the push-up operation portion is formed on the lower surface of the engaging groove having a rectangular cross section formed on the front surface or the rear surface of the upper die, and The upper surface is engageable with the rectangular section of the operating member, and the vertical width of the engaging groove is slightly larger than the vertical dimension of the rectangular section of the operating member. The upper mold is easily attached to and detached from the holder device, and the vertical movement of the upper mold relative to the upper die holder device does not become too large, so that stable attachment and detachment can be performed.

[Brief description of drawings]

FIG. 1 is a front view of an upper die holder device.

FIG. 2 is a sectional view taken along the line 2-2 in FIG.

FIG. 3 is a sectional view of a main portion showing a second embodiment.

FIG. 4 is a sectional view of a main portion showing a third embodiment.

FIG. 5 is a front view of an upper die holder device according to another embodiment.

6 is a sectional view taken along line 6-6 in FIG.

7 is a cross-sectional view taken along line 7-7 in FIG.

FIG. 8 is an explanatory view schematically showing the relationship between the upper die holder device and the upper die.

FIG. 9 is an explanatory view showing another embodiment of the upper die holder device and the upper die.

FIG. 10 is an explanatory view showing another embodiment of the upper die holder device and the upper die.

[Explanation of symbols]

 1 Upper Die Holder Device 7 Support Plate a Upper Die 11 Upper Die Clamp 17 Wedge Member 17K Projection 9K Engagement Groove 9F Contact Surface 9S Sliding Contact Surface

Claims (5)

[Scope of utility model registration request] 1. A clamp force gradual increasing mechanism for gradually increasing the clamping force of the upper die by relatively raising the operating member provided in the upper die holder device of the press brake to push up the vertically movable operating member. An upper die for a press brake, which is provided with a push-up operation portion for. 2. The upper die for a press brake according to claim 1, wherein the push-up operation portion is formed on a lower surface of a lateral engaging groove formed on a front surface or a rear surface of the upper die. 3. The push-up actuating portion is formed on a lower surface of a lateral engaging groove formed on a front surface or a rear surface of the upper die, and an upper surface of the engaging groove is engageable with a part of the operating member. The upper die for a press brake according to claim 1, wherein there is an upper die. 4. The push-up actuating portion is formed on a lower surface of a lateral engaging groove formed on a front surface or a rear surface of the upper die, and the engaging groove is a shoulder contact surface of a shoulder portion formed on the upper die. The upper die for a press brake according to claim 2 or 3, wherein the upper die is provided between a height position substantially equal to the above and a height position slightly lower than the upper end of the upper die. 5. A vertically movable movable operating member is pushed up by a clamp force increasing mechanism in which the upper mold clamping force is gradually increased by relatively raising the operating member provided in the upper die holder device of the press brake. Is provided on the lower surface of the engaging groove having a rectangular cross section formed on the front surface or the rear surface of the upper die, and the upper surface of the engaging groove is the operation member. For a press brake, which is engageable with a rectangular section of the member, and in which the vertical width dimension of the engaging groove is slightly larger than the vertical dimension of the rectangular section section of the operating member. Upper mold.