JPH0732043A - Upper die for press brake - Google Patents

Abstract

PURPOSE:To facilitate attaching/detaching of an upper die by raising the wedge member with an upper die, when the upper die is relatively raised against a support plate, and thereby increasing the clamping force of the upper die. CONSTITUTION:An upper die 9 and a lower die 63 are engaged with each other by vertically moving the movable side of an upper and a lower table 3, 61. The upper die 9 is relatively raised against the main body 5 of a holder. At this time, the lower face of the protruding part 17K of a wedge member 17 is pushed up with the lower face of an engaging groove 9K in the upper die 9, and the wedge member 17 is raised. Consequently, an upper die clamp 11 is rotated, the elastic member 47 of a device 13 for adjusting a clamp force is gradually compressed, and the upper die 9U is firmly clamped. A clamp force is adequately obtained at the time of attaching the upper die 9; the falling is prevented of the upper die 9 due to an insufficient clamp force; and the difficulty is eliminated of detaching the upper die 9 due to an excessive clamp force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upper mold which is attachable to and detachable from an upper mold holder device in a press brake, and more specifically, to increase a clamping force when the upper mold is mounted on the upper mold holder device. The present invention relates to an upper mold capable of operating the upper mold holder device.

[0002]

2. Description of the Related Art As is well known, a press brake has an upper table (sometimes called an upper apron) and a lower table (sometimes called a lower apron) which are vertically opposed to each other. The configuration is such that 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 bend the plate-shaped work.

In the above construction, 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 a thing.

In the press brake, for example, in order to replace the upper mold depending on the bent shape of the work, a large number of upper mold holders are attached to the lower part of the upper table, and the upper molds 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 body attached to the lower portion of the upper table, and the upper die clamp is tightened with the tightening bolts, so that the upper die clamp is used to attach the upper die clamp to the upper die. The upper part is firmly tightened and fixed.

Therefore, conventionally, in order to attach and detach the upper die to and from the upper table, it is necessary to operate a large number of tightening bolts provided in a large number of upper die holders, which is extremely troublesome 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]

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

Further, in the conventional upper die holder device,
When the upper mold clamp released by the upper mold holder device is released, the upper mold 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 upper die is aligned with the lower die. There is a problem that the clamp has to be strongly tightened and the operation is troublesome.

As a prior art example which seems to be related to the present invention, there is, for example, EP0387121A1.

In this prior art example, the upper die is clamped between the holder body and the upper die clamp pivotally mounted on the upper table of the press brake so that the upper die can be attached and detached as described above. This is a configuration in which the upper die is rotated while avoiding 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 its object is to allow the upper die to be easily attached and detached and replaced and to release the upper die from the fixed state. Another object of the present invention is to provide a removable upper mold for an upper mold holder device in which the upper mold does not drop.

[0015]

In view of the conventional problems as described above, the present invention provides a support plate mounted on the lower part of the upper table of the press brake and provided on the lower part of the holder main body of the upper die holder device, and the above-mentioned support plate. An upper die for press brake that is swingable on the die holder body and is detachable between the upper die and the upper die clamp that is pressably attached to the support plate. When the upper surface of the support plate is raised relative to the support plate so that the contact surface and the front or rear surface of the support plate are slidable and the lower surface of the support plate contacts the contact surface. A wedge member push-up portion that pushes up a wedge member that is vertically movable below the upper die clamp in order to increase the clamping force of the upper die by the upper die clamp; A processing unit for performing machining of the workpiece with the lower mold in cooperation with the over key is made comprises a.

The wedge member pushing-up portion is formed on the lower surface of the engaging groove formed in the upper mold so as to be engageable with and disengageable from the protrusion provided on the wedge member.

Further, on the upper surface of the engaging groove, there is formed an engaging surface for preventing a drop which engages with an upper surface of the protruding portion of the wedge member and prevents the upper die from falling.

Further, the wedge member pushing-up portion is formed on the upper surface of the engaging groove provided in the wedge member and the projecting portion provided in the upper mold so as to be engageable and disengageable.

Further, according to the present invention, a support plate provided on a lower portion of a holder main body of an upper die holder device mounted on a lower portion of an upper table of a press brake, and an upper die which is swingable to the upper die holder body and has the upper support plate. A press brake upper die that can be freely attached to and detached from an upper die clamp that is pressed against the contact surface that can abut the lower surface of the support plate and the front or rear surface of the support plate. Increasing the clamping force of the upper mold by the upper mold clamp when the upper mold is relatively raised with respect to the support plate so that the free sliding contact surface and the contact surface contact the lower surface of the support plate. In order to do this, the wedge member push-up portion that pushes up a wedge member that is vertically movable below the upper die clamp, and the lower die provided in the press brake work together to process the workpiece. And a processing portion for performing, and when the wedge member push-up portion is in a state of lightly contacting the wedge member to push up the wedge member, a distance dimension between the lower surface of the support plate and the contact surface of the upper die. H is a press brake upper die given by the following equation.

H = (B ² · P) / (A ² · k · tan θ) where A is the dimension from the rotation center of the upper mold clamp to the elastic means for pressing the upper mold clamp, and B is the rotation. The average size from the center to the pressing action part where the upper mold clamp presses the upper mold against the support plate via the wedge member, P is the pressing force for pressing the upper mold against the support plate, and K is the elastic coefficient of the unitary means. , Θ are the inclination angles of the wedge members.

[0021]

In the above structure, the upper part of the upper mold is positioned between the support plate and the swingable upper mold clamp in the upper mold holder device, and the engaging groove formed in the upper mold is fitted to the lower part of the upper mold clamp. The wedge member push-up portion formed on the lower surface of the engaging groove is engaged with a protruding portion of a wedge member that is vertically movable in the upper portion, and moves the upper die relatively upward with respect to the support plate. Therefore, when the wedge member is relatively moved upward, the wedge member pushes the lower part of the upper die clamp and the support plate, so that the clamping force due to the reaction force of the elastic means gradually increases. , The upper mold is securely clamped.

When the clamping force is released, the upper surface of the protruding portion of the wedge member engages with the upper surface of the upper die engaging groove,
The upper mold is prevented from falling.

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

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to facilitate understanding, first, the overall structure of an upper die holder device 1 to which the present invention is applied will be described.

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

The upper die holder device 1 press-fixes the upper portion 9U of the upper die 9 to the holder body 5 detachably attached to the upper table 3 and the support plate 7 integrally provided on the lower portion of the holder body 5. In order to do so, the upper mold clamp 11 that is swingably mounted on the holder body 5, and the upper mold clamp 11
Clamping force adjusting device 13 capable of adjusting the clamping force of
A clamp releasing device 15 capable of releasing the clamp of the upper die 9 by the upper die clamp 11, and a wedge-shaped member 17 provided on the lower portion of the upper die clamp 11 so as to be vertically movable relative to the upper die. 9 is provided with an appropriately shaped engaging portion 9K and an engaging / disengaging engaging portion 17K.

More specifically, the holder body 5 has a thick upper block portion 5 in the front-rear direction (left-right direction in FIG. 2).
In the lower part of B, the thin support plate 7 is integrally provided. 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 via a plurality of bolts 19 (see FIG. 1).
Is installed.

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.

A wedge member 27 is interposed between the upper surface of the holder body 5 and the lower surface of the upper table 3 in order to adjust the vertical position of the holder body 5. A long hole 29 formed in the plate 21 in the left-right direction (see FIG.
The fixing bolt 31 that penetrates through (see) is screwed.

In the above structure, the wedge member 27 is moved to the left and right in FIG. 1 while the clamp jaw 25 is held in a state of being weakly tightened to the extent that the holder body 5 does not fall and the fixing bolt 31 is loosened. By adjusting, the holder body 5 can be finely adjusted up and down with respect to the upper table 3.

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 the upper die 9U of the upper die 9 is provided between the upper die clamp 11 and the support plate 7. It is swingably mounted on the holder body 5 so as to be pressed against the support plate 7 and fixed by tightening.

More specifically, the upper mold clamp 11 has a plurality of through holes 11H provided at a substantially central portion in the vertical direction of the upper mold clamp 11 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, a coil spring 37 that acts so as to separate them from each other is mounted between the upper mold clamp 11 and the support plate 7.

An inclined surface 11S is formed at a lower portion of the upper clamp 11 so that an upper side thereof approaches the support plate 7 side. The wedge-shaped member 17 is vertically moved on the inclined surface 11S. It is movably attached.

More specifically, vertical holes 11LH are provided on the left and right sides of the lower end of the upper clamp 11, and the mounting bolts 39 are screwed into the wedge-shaped member 17 through the holes 11LH. The wedge-shaped member 17 is attached to the upper die clamp 11 so as to be movable up and down.

The engaging portion 9K formed on the upper die 9
The engaging groove 17K in the left-right direction and the engaging portion 17K which can be engaged and disengaged are formed so as to project at appropriate positions on 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 on the upper block portion 5B. It is installed inside the horizontal hole 5H provided.

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

In the above construction, 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 portion 41H of the adjusting screw 41 in the clamping force adjusting device 13 is in contact with the inner wall portion of the hole 5H, and the ring member 43 is contacted with the cylindrical pressing member 49 including the nut member 45. I'm in contact.

The pressing member 49 is provided with the clamp releasing device 15 provided on the upper die clamp 11.
The tip portion of the tightening screw 51 in FIG. More specifically, the clamp releasing device 15 includes the upper clamp 11
The tightening screw 51 is screwed through the upper part of the screw and the lever 53 is integrally attached to the tightening screw 51.

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

In 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, the clamp releasing device is released. The lever 53 in 15,
When the tightening screw 51 is tightened by turning to the position R in the right direction in FIG.
7 is further compressed, and the accumulating force of the elastic member 47 increases, and the upper mold clamp 1 is caused by the reaction force of the accumulating force.
1 more firmly clamps and fixes 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 9 is released from the tightening fixation of the upper mold 9. .

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 regulate the upward movement of the upper die clamp 11, as shown in FIG. 1, a plurality of restraints contacting the upper surface of the upper die clamp 11 are provided. The piece 57 is attached to the holder body 5 with bolts 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 die 9 which is attached to and detached from the upper die holder device 1 having the above-described structure has an abutment surface 9 that abuts a lower end surface 7E of the support plate 7.
Equipped with F. 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 engaging groove as the engaging portion 9K and the upper surface as the engaging surface that is engageable with the upper surface of the protruding portion 17K of the wedge member 17 and the protruding portion 17K.
The lower surface of the engaging groove 9K has a rectangular cross section in which a lower surface as a pushing-up operation portion or a lower surface as a wedge member pushing-up portion is provided in parallel with each other. 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 engaging groove 9K of the upper die 9 can be easily engaged, the wedge member 17 is not necessary.
So that the relative vertical movement between the upper die 9 and the upper die 9 is not too large, the engagement groove 9 is larger than the vertical dimension of the protrusion 17K.
The vertical dimension of K is slightly larger.

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

First, the lever 53 of the clamp releasing device 15 is rotated to the position R to hold the tightening screw 51 in the tightened state. In this way, even when the tightening screw 51 is tightened, the support plate 7 and the upper clamp 11
The wedge-shaped member 17 at the lower part of the is open, and the wedge-shaped member 17 is relatively lowered by its own weight.

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 in the left and right direction, and the engaging 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.

Thereafter, the movable sides of the upper and lower tables 3 and 61 in the press brake are 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.

As described above, the upper mold 9 is attached to the holder body 5.
Is gradually increased, the protrusion 17 of the wedge member 17
Since the lower surface of K is pushed up by the lower surface of the engaging groove 9K in the upper die 9, the wedge-shaped member 17 also integrally rises. Therefore, the upper mold clamp 11 is gradually rotated counterclockwise in FIG.
The elastic member 47 in No. 3 is gradually compressed.

Therefore, the upper die 9 moves up relatively,
When the contact surface 9F contacts the lower end surface 7E of the support plate 7, the upper die clamp 11 is in a state of firmly clamping the upper die 9U by the action of the accumulating force of the elastic member 47.

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

As described above, the upper die 9 is attached to the upper die holder device 1.
In order to remove the upper mold 9 from the upper mold holder device 1 after mounting, the lever 53 is rotated to the left position L, and the tightening by the tightening screw 51 is loosened as described above. When the tightening screw 51 is loosened as described above, the tightening and fixing of the upper mold 9 by the upper mold clamp 11 is released.

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 released.
Is lowered to its original lowered position by its 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.

As described above, when the upper die 9 is released from the clamping and fixing of the upper die 9, the upper die 9 is moved in the left-right direction to remove the upper die 9 from the upper die holder device 1. Is something that can be done.

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. Is something that can be done.

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

As a part of the configuration of the clamp force increasing mechanism, the clamp force adjusting device 13 having the elastic member 47 is provided. Instead of the clamp force adjusting device 13, a compressive fluid (gas) is incorporated. It is also possible to employ a fluid pressure cylinder. Alternatively, the upper die clamp 11 itself may be configured by a leaf spring, the clamp adjusting device 13 may be omitted, and the elastic deformation of the upper die clamp 11 may be used.

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 locking portion 17 of the wedge-shaped member 17 is used.
K is formed in a groove shape, and the engaging portion 9K of the upper die 9 is formed in a protruding portion. That is, the wedge member 17 is pushed up by the protrusion 9K of the upper mold 9.

The other construction is the same as that of the first embodiment.

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

FIG. 4 shows a third embodiment. In this embodiment, a protruding portion 17P is formed on the upper part of the wedge-shaped member 17, and the protruding portion 17P is brought into contact with the upper surface of the upper die 9 to make the upper die. The wedge member 17 is pushed up by the upper surface of the member 9, and the other structures are the same as those of the first embodiment.

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

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 configured.

Therefore, parts having the same functions as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. Only 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.
7H hemispherical shaped stud 67 has mounting bolt 6
The upper die clamp 65 is swingably supported by the stud 67.

In order to operate the mounting bolt 69, a tool hole 11T is formed in the front upper die clamp 11, and the head die 67H of the stud 67 has the upper die clamp 6 attached thereto.
A detent pin 71 that engages with the groove 65G formed in No. 5 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. The contact member 75 attached to the upper part of the rear upper mold 65 penetrates the small diameter hole 73 and contacts the head 41H of the adjusting screw 41.

A ring nut 77 for restricting 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 bolt 69, the upper mold clamp 65 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 clamping of the upper mold 9 by the rear upper mold clamp 65 is released.

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

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

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

By the way, as described above, the upper die 9 is relatively moved upward with respect to the support plate 7 in the upper die holder device 1, and the wedge member 17 as an operating member is pushed up to perform an operation. Since the clamping force by the clamp 11 is gradually increased, it is necessary to obtain a sufficiently large clamping force when the contact surface 9F of the upper mold 9 contacts the lower end surface 7E of the support plate 7.

Therefore, as shown schematically 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 dimension between the lower end surface 7E of the support plate 7 and the contact surface 9F of the upper die 9 is H; the elastic means of the clamping force adjusting device 13 for pressing the upper die clamp 11 from the rotation center of the upper die clamp 11. The dimension up to 47 is A; the average dimension from the rotation center to the pressing portion where the upper die clamp 11 presses the upper die 9 against the support plate 7 via the wedge member 17 is B; the upper die 9 is supported by the support plate 7. It is desirable that the dimension H is a dimension represented by the following equation, where P is the pressing force for pressing to P, 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 relative 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 fall, 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, the clamp may not be released sufficiently. It may be difficult to attach and detach 9, which is not desirable.

[0086]

As will be understood from the above description of the embodiments, according to the present invention, the upper die is clamped by moving the upper die relative to the support plate in the upper die holder device. The upper die can be easily attached to and detached from the upper die holder device configured to increase the force.

Further, when the upper die is mounted on the upper die holder device, the clamping force can be obtained just enough.
It is possible to prevent the upper mold from falling due to insufficient clamping force, and
The upper clamp does not become difficult to attach and detach due to excessive clamping force.

Further, at the time of attaching / detaching / replacement of the upper die, the upper die 9 is in a locked state for safety.

[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.

[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 (8)

[Claims] 1. A support plate mounted on the lower part of an upper table of a press brake and provided on a lower part of a holder main body of an upper mold holder device, and swingable on the upper mold holder main body and capable of pressing the upper mold to the support plate. An upper die for a press brake that is detachable between an upper die clamp provided and an abutment surface that abuts against the lower surface of the support plate and a front or rear surface of the support plate that can slide. A surface and a lower surface of the support plate to increase the clamping force of the upper mold by the upper mold clamp when the upper mold is relatively raised with respect to the support plate so as to contact the contact surface. A wedge member push-up portion that pushes up a wedge member that is vertically movable below the upper die clamp, and a processing portion that cooperates with a lower die provided in the press brake to perform work processing. An upper mold for a press brake, which is equipped with. 2. The wedge member push-up portion is formed on a lower surface of an engagement groove formed in an upper mold so as to be engageable with and disengageable from a protrusion provided on the wedge member. Upper mold for the press brake described. 3. An engagement surface for preventing a drop is formed on an upper surface of the engagement groove to engage with an upper surface of the protrusion of the wedge member to prevent the upper die from falling. The upper die for a press brake according to Item 2. 4. The wedge member pushing-up portion is formed on the upper surface of an engaging groove provided on the wedge member and a projecting portion provided on the upper die so as to be engageable and disengageable. Upper mold for press brake. 5. A support plate provided on a lower portion of a holder main body of an upper die holder device mounted on a lower portion of an upper table of a press brake, and swingable on the upper die holder body and capable of pressing the upper die to the support plate. An upper die for a press brake that is detachable between an upper die clamp provided and an abutment surface that abuts against the lower surface of the support plate and a front or rear surface of the support plate that can slide. A surface and a lower surface of the support plate to increase the clamping force of the upper mold by the upper mold clamp when the upper mold is relatively raised with respect to the support plate so as to contact the contact surface. A wedge member push-up portion that pushes up a wedge member that is vertically movable below the upper die clamp, and a processing portion that cooperates with a lower die included in the press brake to perform work processing. And a distance dimension H between the lower surface of the support plate and the abutment surface of the upper die is expressed by the following equation when the wedge member pushing-up portion is in a state of lightly contacting the wedge member to push up the wedge member. Upper mold for press brakes characterized by being given. H = (B ² · P) / (A ² · k · tan θ) where A is the dimension from the center of rotation of the upper mold clamp to the elastic means for pressing the upper mold clamp, and B is the distance from the center of rotation to the above. The average size up to the pressing action portion where the upper mold clamp presses the upper mold against the support plate via the wedge member, P is the pressing force that presses the upper mold against the support plate, K is the elastic coefficient of the unitary means, and θ is It is the inclination angle of the wedge member. 6. The wedge member push-up portion is formed on a lower surface of an engagement groove formed in an upper mold so as to be engageable with and disengageable from a protrusion provided on the wedge member. Upper mold for the press brake described. 7. An upper surface of the engagement groove is formed with an engagement surface for engagement with the upper surface of the protrusion of the wedge member to prevent the upper die from falling. The upper die for a press brake according to Item 6. 8. The wedge member push-up portion is formed on an upper surface of a projection portion provided on an upper die so as to be engageable with and disengageable from an engagement groove provided on the wedge member. Upper mold for press brake.