JPH0857542A - Upper die holder in press brake - Google Patents

Abstract

PURPOSE: To facilitate attaching/detaching and exchange of an upper die by providing a clamp operating means and a means to always lightly press and energize an upper die clamp in the direction to clamp the upper die. CONSTITUTION: For attaching an upper die 5 onto an upper die holder 1 from the lower side, an operating level 65 is positioned at an up and down attaching and detaching position, an upper die clamp 11 is turned against a pressing and energizing means, and the lower side of the upper die clamp 11 is opened. Between an upper die supporting part 9 of the holder body 7 and the upper die clamp 11, the upper part of the upper die 5 is inserted from the lower side. When it is inserted, because the upper die clamp 11 is always pressed and energized lightly in the direction to clamp the upper die 5 with the action of the pressing and energizing means 17, energizing projections 11P installed on the lower part of the upper die clamp 11 are engaged with a drop preventing groove 5G installed on the upper die 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upper die holder device for a press brake, and more particularly to an upper die holder device for easily attaching and detaching an upper die to and from an upper table of the press brake.

[0002]

2. Description of the Related Art 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 table is configured to be vertically driven by using one of the tables as a ram.

In the press brake having the above structure, a lower die (die) is attached to the upper portion of the lower table and an upper die (lower portion) to the lower portion of the upper table in order to bend a plate-shaped work. Punch) is attached.

In the above structure, after the work is positioned on the lower die, the work can be bent by engaging the upper die and the lower die.

By the way, in the press brake, in order to replace the upper mold due to the difference in the bending shape of the work, for example, a large number of upper mold holder devices are attached to the lower portion of the upper table, and the large upper mold holder devices are mounted. The upper die is detachably and replaceably supported by the upper table.

In the conventional upper die holder device, an upper die clamp is swingably attached to a holder body attached to a lower portion of an upper table through a tightening bolt, and the upper die clamp is inserted between the upper die clamp and the holder body. The upper part of the upper mold is strongly clamped and fixed by the upper mold clamp by tightening the tightening bolt.

[0007]

Therefore, in the conventional construction, 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 holder devices. However, there is a problem that this operation is extremely troublesome and troublesome.

Therefore, an upper die holder device having a structure in which an air cylinder is attached to the upper die holder device and operations such as tightening and releasing of the upper die clamp by the air cylinder have been developed.

In the upper die holder device having the above-mentioned structure, it is necessary to provide an air cylinder for each of the upper die holder devices, and an air source is required. Therefore, there is a problem that the structure becomes complicated and expensive. .

Further, in the conventional upper die holder device,
There is a risk that the upper mold will fall if the upper mold clamp is released.

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 and the lower die are aligned and centered. In this state, the upper mold clamp must be strongly tightened, and there is a problem that the operation is troublesome.

As a precedent example related to the present invention, for example, EP0387121A1 (hereinafter referred to as "preceding example 1").
And JP-A-6-23436 (hereinafter referred to as Prior Art 2).

In the above-mentioned first example, the upper die is clamped between the holder body and the upper die clamp swingably pivotally attached to the upper table of the press brake. The configuration is performed while rotating the upper die 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 is special and machining of the upper die is troublesome.

In the prior art example 2, the upper die can be easily attached to and detached from the upper die holder device by operating the operation lever provided in the upper die holder device to the clamp position and the unclamp position. However, in the prior art example 2, since the upper die is moved in the longitudinal direction (horizontal direction) with respect to the upper die holder device so as to be attached / detached and replaced, the upper die has a plurality of split dies having different lengths. This is a combined configuration, and there is a problem in that the detachable replacement is troublesome when attempting to attach / detach the split mold near the central portion.

[0015]

In view of the problems of the prior art as described above, the upper die holder device according to the present invention has an upper die at the bottom of a holder body detachably attached to an upper table in a press brake. An upper die support portion for supporting is provided, and a pressing portion for pushing the upper die to the upper die support portion is provided under the upper die clamp that is swingably supported by the holder body around the central portion in the vertical direction as a fulcrum. A locking protrusion that is provided and is provided in the fall prevention groove provided in the upper die is provided to press the upper side of the upper die clamp to apply a clamping force for clamping the upper die by the upper die clamp. Clamping force applying means is provided on the holder main body, clamping operation means is provided which can transmit and release the clamping force by the clamping force applying means to the upper die clamp, and clamps the upper die. Those formed by providing a pressing energizing means for constantly pressed lightly urging the upper tool clamp to direction.

Further, in the upper die holder device according to the present invention, an upper die supporting portion for supporting the upper die is provided at the lower portion of the holder body detachably mounted on the upper table in the press brake, and the upper and lower portions of the holder body are vertically moved. In the lower part of the upper mold clamp, which is swingably supported about the central portion in the direction, a pressing portion for pressing the upper mold to the upper mold supporting portion is provided, and is locked in a fall prevention groove provided in the upper mold. The holder body is provided with a clamping force applying means for providing a free locking protrusion, and for applying an clamping force for pressing the upper side of the upper die clamp to clamp the upper die by the upper die clamp. Provided is clamp operation means capable of transmitting and releasing the clamping force by the applying means to the upper die clamp,
In addition, a pressing biasing means for constantly pressing the upper mold clamp in the direction of clamping the upper mold is provided, and the upper mold clamp is released in a state where the upper mold clamp is released against the pressing biasing means. A release state holding means that can be held is provided.

Further, in the upper die holder device according to the present invention, an upper die supporting portion for supporting the upper die is provided on the lower portion of the holder body detachably mounted on the upper table in the press brake, and the holder body is vertically moved. A pressing portion for pressing the upper die against the upper die supporting portion is provided below the upper die clamp that is swingably supported around the center of the upper die, and can be locked in the fall prevention groove provided in the upper die. And a clamping force applying means for applying a clamping force for pressing the upper side of the upper die clamp to clamp the upper die by the upper die clamp, and providing the clamping force. A clamp operating means is provided that can transmit and release the clamping force by the means to the upper clamp.
Further, a wedge piece that is engageable with a fall prevention groove provided on the upper die is provided above the locking protrusion provided on the lower portion of the upper die clamp by urging in a direction that can advance and retreat and engage with the fall prevention groove. It will be.

The clamp operating means includes a pressing control member rotatably provided on the upper die clamp and capable of coming into contact with and separating from the pusher portion of the clamping force applying means. The clamping position for clamping the upper mold, the unclamping position where the upper mold clamp movably supports the upper mold in the longitudinal direction, and the upper and lower attachment / detachment positions where the upper mold can be vertically attached to and detached from the upper mold clamp. An operation lever for freely rotating the control member is provided so as to be attachable to and detachable from the pressing control member.

Further, a stopper member for positioning the operation lever at the clamp position and the unclamp position is provided, and the stopper member is provided so as to be retractable from the moving region of the operation lever.

Further, a wedge piece engageable with a fall prevention groove provided on the upper die is urged in an upper direction of a locking protrusion provided on a lower portion of the upper die clamp so as to be capable of advancing and retracting and engaging with the fall prevention groove. It is provided by doing.

Furthermore, the released state holding means for holding the upper die clamp in a state where the upper die clamp is released is provided with a locking recess or a plunger at the upper portion of the upper die clamp, and a holder body supporting the upper die clamp. The side is provided with a plunger or a locking recess that can be engaged with and disengaged from the locking recess or the plunger.

[0022]

As is apparent from the above construction, in the present invention, the upper die clamp is swingably supported on the holder body mounted on the upper table of the press brake. A pressing portion for pressing the upper die is provided to an upper die supporting portion provided at a lower portion of the holder main body, and a locking projection capable of engaging with a fall prevention groove provided in the upper die is provided.

The holder body is provided with a clamping force applying means for applying a clamping force to the upper die clamp, and the upper die clamp can transmit the clamping force by the clamping force applying means to the upper die clamp. In addition, a clamp operating means that can be released is provided. Further, there is provided a pressing urging means for constantly urging the upper mold clamp lightly in the direction of clamping the upper mold.

Therefore, by holding the upper mold clamp in a lightly biased state by the pressing biasing means, and engaging the locking projection provided at the lower portion of the upper mold clamp with the fall prevention groove provided in the upper mold. The fall of the upper mold from the upper mold holder device can be reliably prevented.

When the clamping force by the clamping force applying means is transmitted to the upper die clamp by the operation of the clamp operating means, the upper die clamp firmly presses and fixes the upper die onto the upper die supporting portion of the holder body. The mold can be securely fixed.

Further, since the released state holding means for holding the upper die clamp in a state where the upper die clamp is released against the pressing biasing means is provided, the clamp applying means is operated by the operation of the clamp operating means. When the transmission of the clamping force to the upper mold clamp is released, the upper mold clamp can be held in a state where the upper mold clamp is released against the pressing biasing means by the released state holding means.

As described above, when the upper die clamp releases the upper die clamp, it is easy to remove the upper die downward from the upper die holder device.

Further, in the present invention, the clamp operating means includes a pressing control member which is rotatably provided on the upper mold clamp and which is capable of coming into contact with and separating from the pusher portion of the clamping force applying means. The control member is provided with an operation lever that can be rotated to three positions of a clamp position, an unclamp position, and an upper and lower attachment / detachment position, and the operation lever is detachably attached to the pressing control member.

Therefore, when the pressing control member is rotated to the clamp position by the operation of the operating lever to bring the pressing control member into contact with the pusher portion of the clamping force applying means, the clamping force of the clamping force applying means is applied to the upper die clamp. It can be transmitted, and the upper mold clamp can be performed by the upper mold clamp.

When the pressing control member is rotated to the unclamping position by operating the operation lever, the upper die clamp releases the pressing fixation of the upper die clamp, and the upper die is movable in the upper die holder in the longitudinal direction. Supported.

When the pressing control member is pivotally moved to the upper and lower attachment / detachment positions by operating the operation lever, the transmission of the clamp force from the clamp force applying means to the upper mold clamp is released, and the clamp force is lowered to the upper mold holder device. The upper die can be attached and detached and replaced from the direction.

Further, since the operation lever is attachable to and detachable from the pressing control member, when the operation lever interferes with the bending shape of the work, the operation lever can be removed so as not to interfere. It is a thing.

Further, in the present invention, since the stopper member for positioning the operation lever at the clamp position and the unclamp position is provided so as to be retractable from the moving area of the operation lever, the operation lever can be easily positioned and the workpiece can be easily positioned. Depending on the bent shape, it can be immersed beforehand so as not to get in the way.

Further, in the present invention, since the wedge piece that can be engaged with the fall prevention groove provided in the upper die is provided above the locking protrusion provided in the lower portion of the upper die clamp, the upper die can be moved forward and backward. The play (clearance) between the provided fall prevention groove and the locking projection can be reduced, and the upper die can be prevented from falling more reliably.

Further, the released state holding means has a structure in which a locking recess is provided in the upper part of the upper mold clamp, and a plunger which can be engaged with and disengaged from the locking recess is provided on the holder main body side. The upper die clamp can be securely held in the released state when detaching.

[0036]

1 and 2, an 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 brake (the entire structure is not shown). . The upper die holder device 1 is used by being mounted on the lower portion of the upper table 3 in a large number in the left-right direction at appropriate intervals.

That is, the upper die 5 in the press brake
In the left-right direction (in FIG. 1, the direction perpendicular to the paper surface,
In some cases, the upper die holder device may be a long one in the left-right direction, or may be used by appropriately combining a plurality of split dies having different length dimensions. A number 1 is mounted on the upper table 3 at appropriate intervals.

As is apparent from FIG. 1, the upper die holder device 1 includes a holder main body 7 which is detachably mounted on the upper table 3, and an upper die supporting portion integrally provided under the holder main body 7. 9, the upper die 5U of the upper die 5 can be pressed and fixed, the upper die clamp 11, the clamping force applying means 13 for imparting a clamping force to the upper die clamp 11, and the clamping force by the clamping force applying means 13 Clamp operating means 15 that can be transmitted and released to the mold clamp 11
And a pressing urging means 17 for constantly pressing the upper mold clamp 11 lightly in the direction of pressing and fixing the upper mold 5 (see FIG. 2).
And a release state holding means 19 capable of holding the upper die clamp 11 in a state where the clamp of the upper die 5 is released against the pressing biasing means 17.

More specifically, the holder body 7 has a shape in which the thin upper die support portion 9 is integrally provided under the thick block portion 7B in the front-rear direction. A mounting plate 25 projecting upward is integrally attached to the front surface (left side surface in FIG. 1) of the block body 7B of the holder body 7 by a plurality of bolts 21 and pins 23 (see FIG. 2).

As shown in FIG. 2, the mounting plate 25 has a mode in which a divergent cutout is provided at the center of the lower portion. As shown in FIG. 1, the upper protruding portion of the mounting plate 25 is brought into contact with the lower front surface of the upper table 3, and the clamping jaws 29 are screwed by the tightening bolts 27 screwed to the upper table 3.
The upper plate 3 of the upper plate 3
The holder main body 7 can be attached to the upper table 3 by pressing and fixing to.

Although the holder body 7 and the mounting plate 25 are separately provided and integrally fixed in this embodiment, the holder body 7 and the mounting plate 25 may be integrally provided in advance. That is, the mounting plate 25 can be regarded as a part of the holder body 7.

In order to adjust the vertical position of the holder main body 7, a wedge member 31 is interposed between the upper surface of the holder main body 7 and the lower surface of the upper table 3 so that the position of the wedge member 31 can be adjusted in the left-right direction. A fixing bolt 35 is threadedly attached to the member 31 so as to pass through an elongated hole 33 in the left-right direction provided in the mounting plate 25.

In the above-mentioned structure, the wedge member 31 is adjusted in the left-right direction in FIG. 2 while the clamp jaws 29 are held in a slightly tightened state and the fixing bolts 35 are loosened so that the holder body 7 does not fall. By doing so, the holder body 7 can be finely adjusted up and down with respect to the upper table 3.

The upper mold clamp 11 is made of a plate-shaped member having a width substantially the same as the width of the holder body 7 in the left-right direction, and is provided at a portion corresponding to a divergent notch of the mounting plate 25. Has an upper protrusion of a corresponding shape, and is swingably supported by the holder main body 7 so as to press and fix the upper portion 5U of the upper die 5 between the upper die support portion 9 and the upper die support portion 9.

More specifically, a plurality of through holes 11H are provided in the upper die clamp 11 in the vicinity of the vertical center thereof.
It is swingably supported by the head portion of a mounting bolt 39 which is passed through the through hole 11H and horizontally screwed and fixed to the upper die support portion 9 via a nut 37. A coil spring 41, which acts so as to separate the upper die support portion 9 and the upper die clamp 11 from each other, is elastically mounted.

The contact portion between the head of the mounting bolt 39 and the through hole 11H is formed into a spherical contact surface so that the upper clamp 11 can be swung smoothly.

At the lower end of the upper die clamp 11, a locking projection 11P which is capable of locking the horizontal drop prevention groove 5G formed on the upper die 5 is projected toward the upper die supporting portion 9. Has been formed. A pressing member 43 that abuts the inclined surface 5S of the upper portion 5U of the upper die 5 and presses the upper die 5 against the upper die support portion 9 is provided slightly above the locking protrusion 11P.

The pressing member 43 has a shape obtained by processing a part of the peripheral surface of the cylinder into a flat surface, and is attached to the lower part of the upper mold clamp 11 via a plurality of screws 45 so as to be slightly rotatable.

A wedge piece 47, which is engageable with the fall prevention groove 5G of the upper mold 5, is provided between the upper portion of the locking projection 11P and the pressing member 43 so as to be movable back and forth.
The wedge piece 47 is constantly urged in a direction to engage with the fall prevention groove 5G by the action of an elastic member 49 such as a coil spring elastically mounted between the wedge piece 47 and the upper die clamp 11.

The movement of the wedge piece 47 due to the urging force is restricted by a part of the wedge piece 47 contacting a part of the pressing member 43, and the fall prevention groove is formed on the upper surface of the tip of the wedge piece 47. An inclined surface 47S is formed so that engagement and disengagement with respect to 5G can be easily performed.

The clamping force applying means 13 for applying a clamping force for pressing and fixing the upper die 5 to the upper die supporting portion 9 by the pressing member 43 provided under the upper die clamp 11. Is installed in a hole 7H in the front-rear direction provided in the block portion 7B of the holder body 7.

More specifically, as shown in FIG. 1, the clamping force applying means 13 includes a nut member screwed to the adjusting screw 51 to adjust the position of the ring member 53 movably fitted to the adjusting screw 51. 55 and the head 51 of the adjusting screw 51
It is provided with a strong elastic member 57 such as a disc spring mounted between the H and the ring member 53.

The head portion 51H of the adjusting screw 51 has the hole 7
The ring member 53 is in contact with the inner wall of the H, and the ring member 53 is in contact with one end of a cylindrical pressing member 59 that encloses the nut member 55 and is movably provided in the hole 7H. The other end of the pressing member 59 is in contact with a ring nut 61 screwed into the entrance of the hole 7H in a positionally adjustable manner, and is a pin-shaped pusher provided on the other end of the pressing member 59. The portion 59P is projected from the ring nut 61 to the outside.

The clamp operating means 15 capable of transmitting and releasing the clamping force by the clamping force applying means 13 to the upper die clamp 11 is provided on the upper side of the upper die clamp 11.

More specifically, the above-mentioned clamp operating means 15
Includes a pressing control member 63 that is rotatably provided on the upper die clamp 11 and that is capable of abutting and separating from the pusher portion 59P.

In this embodiment, the pressing control member 6 is used.
3, the pressing screw 63 is screwed onto the upper part of the upper clamp 11 so as to be able to move forward and backward, and the tip end of the pressing screw 63 is in contact with the pusher portion 59P.

Therefore, when the pressing screw 63 is rotated with respect to the upper die clamp 11 in a loosening direction, the pressing screw 63 is separated from the pusher portion 59P. On the contrary, when the pressing screw 63 is tightened, the pressing screw 63 is in a state of abutting lightly on the pusher portion 59P. When the pressing screw 63 is further tightened, the pusher portion 59P
Is strongly pressed to compress the elastic member 57. Therefore, the accumulating force of the elastic member 57 is applied as a reaction force.

In order to rotate the pressing screw 63,
An operating lever 65 is detachably attached to the pressing screw 63. That is, the pressing screw 63 is provided with an engagement hole 63H, and the operation lever 65 is integrally attached with an engagement block 67 which can be engaged with and disengaged from the engagement hole 63H. The engagement block 67 has a ball plunger 6 that can be engaged and disengaged with a groove (not shown) provided in the engagement hole 63H.
9 are provided. The ball plunger 69 is for restricting relative rotation of the engagement block 67 with respect to the pressing screw 63.

When the engaging hole 63H is non-circular such as oval or gear-shaped, the engaging block 67 does not rotate relative to the pressing screw 63. The ball plunger 69 can be omitted.

With the above structure, the pressing screw 63 can be rotated by rotating the operation lever 65.

That is, the operating lever 65 has a clamp position A (FIG. 2) at which the upper die clamp 11 clamps the upper die 5.
), An unclamp position B where the upper die clamp 11 supports the upper die 5 so as to be movable in the longitudinal direction, and the upper die clamp 1
The upper mold 5 can be pivotally operated to the upper and lower attachment / detachment positions C where the upper die 5 can be attached / detached in the up / down direction.

A stopper member 71 that can position the operating lever 65 at the clamp position A and the unclamp position B.
(See FIG. 2) is attached to the attachment plate 25.

More specifically, a slit 73 is formed in the mounting plate 25 corresponding to the clamp position A and the unclamp position B, and the stopper member 71 has a pin 75 (FIG. 3) in the slit 73. See)).

Therefore, the stopper member 71 is retractable with respect to the moving surface of the operating lever 65, in other words, the front surface of the mounting plate 25. Note that a hole 25H is formed in the mounting plate 25 so as to communicate with the tip of the slit 73 so that the stopper member 71 recessed in the slit 73 can be easily pulled up. In addition, the stopper member 71
In order to maintain the state of protruding from the mounting plate 25 and the state of being immersed in the slit 73, the ball plunger 77 that can be engaged with and disengaged from the recess provided in the arc-shaped portion of the stopper member 71.
Is provided on the mounting plate 25.

The pressing biasing means 17 for constantly pressing the upper mold clamp 11 lightly in the direction of clamping the upper mold 5 is provided between the upper part of the upper mold clamp 11 and the block portion 7B of the holder body 7. It is composed of an elastic member 17S (see FIG. 2) such as a coil spring that is mounted on the.

The released state holding means 19 capable of holding the upper die clamp 11 in a state in which the clamp of the upper die 5 is released against the pushing force of the pushing means 17 as shown in FIG. A ball plunger 81 which can be engaged and disengaged with a locking recess 79 such as a groove or a hole formed in the upper part of the upper clamp 11 is attached to the mounting plate 25.

The locking recess 79 may be provided in the mounting plate 25 and the ball plunger 81 may be provided in the upper clamp 11.

With the above construction, the upper die 5 is shown in FIG.
As indicated by the imaginary line, the upper die support portion 9 of the holder main body 7
When the upper die 5 is clamped between the upper die 5 and the upper die clamp 11, the operation lever 65 is rotated to the clamp position A to tighten the pressing screw 63, which is the pressing control member. The elastic member 57 in the means 13 is further compressed.

Therefore, the accumulating force of the elastic member 57 increases, and the reaction force of the accumulating force causes the upper mold clamp 11 to rotate counterclockwise in FIG. The mold 5 is more strongly pressed and fixed.

On the contrary, when the operation lever 65 is rotated to the unclamp position B and the pressing screw 63 is loosened slightly, the pressing screw 63 and the pusher portion 59 of the clamping force applying means 13 are released.
The upper die 5 is released from the pressing and fixing of the upper die 5 by the abutment with P, and the upper die 5 is brought into a state in which the locking projection 11P of the upper die clamp 11 is engaged with the drop prevention groove 5G. Therefore, it is supported so as to be movable in the longitudinal direction (left-right direction).

Stopper member 7 at the unclamp position B
1 into the slit 73, and the operation lever 65
When is rotated up and down to the attachment / detachment position C, the pressing screw 63 is largely moved leftward in FIG. 1, and the pressing screw 63 is separated from the pusher portion 53P of the clamp applying means 13.

That is, the upper mold clamp 11 is released from the clamp applying means 13, and the upper mold clamp 1
1 is rotated against the elastic member 17S of the pressing and urging means 17, so that the engagement recess 79 provided on the upper portion of the upper die clamp 11 and the ball plunger 81 can be engaged with each other.

The locking recess 79 and the ball plunger 81.
In the state in which and are engaged, the lower portion of the upper die clamp 11 opens in a direction away from the upper die support portion 9, and the upper die 5 can be attached to and detached from the upper die clamp 11 in the vertical direction. Become.

When the locking recess 79 of the upper clamp 11 and the ball plunger 81 are engaged with each other as described above, the operating lever 65 is moved to the unclamp position B.
Back to the pressing screw 63 and the clamping force applying means 13
Of the upper die clamp 1 and the pusher portion 59P of
1 is rotated counterclockwise in FIG. 1, and the engagement between the locking recess 79 and the ball plunger 81 is released.

Now, in order to mount the upper mold 5 on the upper mold holder device 1 from the lower side in the above-described structure, the operating lever 65 is positioned at the vertical mounting / dismounting position C as shown in FIG. When the operating lever 65 is located at the upper and lower attachment / detachment position C, the upper mold clamp 11 is pressed by the biasing means 1 as described above.
It can be rotated against 7, and the lower side of the upper die clamp 11 can be opened, and the upper portion 5U of the upper die 5 is inserted from the lower side between the upper die supporting portion 9 of the holder main body 7 and the upper die clamp 11. Can be inserted.

When the upper portion 5U of the upper die 5 is inserted between the upper die supporting portion 9 and the upper die clamp 11, the upper die clamp 11 is always lightened in the clamping direction of the upper die 5 by the action of the pressing biasing means 17. Since it is pressed and urged, the upper mold clamp 1
The locking projection 11P provided on the lower portion of the first member engages with the fall prevention groove 5G provided on the upper die 5.

As described above, when the locking projection 11P of the upper die clamp 11 is engaged with the drop prevention groove 5G of the upper die 5, the operation lever 65 is moved to the unclamp position B as shown in FIG. Turn to.

When the operating lever 65 is rotated to the unclamping position B, the pressing screw 63 comes into contact with the pusher portion 59P of the pressing force applying means 13 and a clamping force is applied to prevent the upper mold 5 from falling, thereby preventing the upper mold 5 from falling. 5 in the longitudinal direction (left-right direction)
It becomes a state that it is movably supported.

Therefore, when the operating lever 65 is in the unclamp position B, the upper die 5 is moved in the left-right direction and the upper die 5 is positioned in the left-right direction with respect to the upper die holder device 1. In this case, when the upper die 5 is composed of a plurality of split dies, the split dies are brought into contact with each other for positioning.

Next, in order to strongly press and fix the upper die 5 to the upper die supporting portion 9 of the holder main body 7 in the upper die holder device 1, as shown in FIG. 6, the operation lever 65 is rotated to the clamp position A. Dynamic positioning. When the operating lever 65 is positioned at the clamp position A, the pressing screw 63 strongly presses the pusher portion 59P of the clamping force applying means 13, and the reaction force causes the upper die clamp 11 to move the upper die 5 to the upper die supporting portion 9. Press and fix.

After that, when the movable table of the press brake is moved up and down to engage the upper die 5 and the lower die (not shown), the upper die 5 is placed between the upper die support 9 and the upper die clamp 11. Is relatively elevated and is inserted.

At this time, the inclined surface 5S of the upper die 5 is pressed by the pressing member 4
Since the upper die 5 is pushed relative to the upper die 5, the upper die 11 is rotated clockwise in FIG. 1, and the pressing screw 63 gradually pushes the pusher portion 59P of the clamping force applying means 13. , The elastic force of the elastic member 57 is gradually increased. Therefore, the upper die clamp 11 is
Is gradually and strongly pressed and fixed.

When the shoulder portion of the upper die 5 contacts the lower end surface of the upper die supporting portion 9, the upper die 5 is strongly pressed and fixed to the upper die supporting portion 9 by the upper die clamp 11, and 1,
As shown in FIG. 7, the wedge piece 47 is engaged with the fall prevention groove 5G of the upper die 5 to close the play (gap) between the engagement protrusion 11P and the fall prevention groove 5G.

As described above, the wedge piece 47 has the upper mold 5
In the state in which the play between the engagement protrusion 11P and the drop prevention groove 5G is closed by engaging with the drop prevention groove 5G, the upper die 5 is released even if the pressing fixation by the upper die clamp 11 is released.
Does not fall by its own weight.

As described above, the upper die 5 is firmly pressed and fixed to the upper die supporting portion 9 by the upper die clamp 11, and the work is bent in cooperation with the lower die. To remove, as shown in FIG. 8, the operation lever 65 is rotationally positioned at the vertical attachment / detachment position C.

Thereafter, the lower side of the upper die 5 is rotated in the direction of arrow R to engage the locking recess 79 provided in the upper portion of the upper die clamp 11 with the ball plunger 81, and the lower side of the upper die clamp 11 is engaged. Is opened so as to be separated from the upper die support portion 9. Then, by pulling the upper die 5 downward, the upper die 5 can be removed downward from the upper die clamp 11 and the like.

After removing the upper die 5 in this manner, the operation lever 65 is once rotated to the unclamp position B to release the engagement between the locking recess 79 and the ball plunger 81, and then the operation is performed. As shown in FIG. 4, the lever 65 is again positioned at the upper and lower attachment / detachment positions C, so that the upper die 5 can be attached to the upper die holder device from below as described above.

Referring again to FIG. 1, the holder body 7
On the rear surface (right side surface in FIG. 1), a rear upper mold clamp 83 is swingably provided so that the front and rear of the upper mold 5 can be reversed and mounted.

More specifically, a support pin 85 corresponding to the mounting bolt 39 is horizontally attached to the rear surface of the upper die support portion 7 by a fixing bolt 89 penetrating a pipe-shaped spacer 87. The rear upper clamp 83 is swingably supported by the pin 85.

The head of the bolt 91 mounted on the upper part of the rear upper die clamp 83 has the above-mentioned clamping force applying means 13.
The head 51H of the adjusting screw 51 in FIG.

Further, in order to prevent relative rotation of the support pin 85 with respect to the rear upper die clamp 83, the locking pin 93 provided on the support pin 85 engages with the groove 83G provided on the rear upper die clamp 83. It is matched.

Since the other structures are the same as those of the upper clamp 11 described above, the same reference numerals are given to the components having the same functions, and detailed description thereof will be omitted.

The unclamping of the upper mold 5 by the rear upper mold clamp 83 is performed by rotating the fixing bolt 89.

The upper die 5 by the rear upper die clamp 83
The clamp is substantially the same as that of the above-mentioned prior art example 2, so that a more detailed description will be omitted.

The present embodiment is not limited to the above-mentioned embodiments, but can be implemented in other modes by making appropriate changes.

For example, a gas spring can be used as the clamping force applying means 13. Further, instead of the pressing screw 63 as the pressing control member, it is possible to employ a cylindrical cam in which the contact portion with the pusher portion 59P is formed as a three-stage cam.

[0097]

As will be understood from the above description of the embodiments, in the present invention, the upper die clamp is swingably supported on the holder body mounted on the upper table of the press brake. The lower part of the upper mold clamp is provided with a pressing part for pressing the upper mold against the upper mold supporting part provided in the lower part of the holder body, and a locking projection that can be locked in the fall prevention groove provided in the upper mold. There is.

The holder body is provided with a clamping force applying means for applying a clamping force to the upper die clamp, and the upper die clamp can transmit the clamping force by the clamping force applying means to the upper die clamp. In addition, a clamp operating means that can be released is provided. Further, there is provided a pressing urging means for constantly urging the upper mold clamp lightly in the direction of clamping the upper mold.

Therefore, according to the present invention, the upper die clamp is held in a state of being lightly biased by the pressing biasing means,
In addition, by engaging the locking protrusion provided on the lower portion of the upper die clamp with the drop prevention groove provided on the upper die, it is possible to reliably prevent the upper die from falling from the upper die holder device.

Further, according to the present invention, when the clamping force by the clamping force applying means is transmitted to the upper die clamp by the operation of the clamp operating means, the upper die clamp firmly presses the upper die against the upper die supporting portion of the holder body. Since it will be fixed, the upper mold can be reliably fixed.

Further, since the released state holding means for holding the upper die clamp is provided in a state where the upper die clamp is released against the pressing biasing means, according to the present invention, the clamp operating means is provided. When the transmission of the clamping force by the clamp applying means to the upper die clamp is released by the operation of, the released state holding means holds the upper die clamp in a state where the upper die clamp is released against the pressing biasing means. You can

When the upper die clamp releases the upper die clamp as described above, it is easy to remove the upper die downward from the upper die holder device.

Further, in the present invention, the clamp operating means includes a pressing control member which is rotatably provided on the upper die clamp and which is capable of coming into contact with and separating from the pusher portion of the clamping force applying means. The control member is provided with an operation lever that can be rotated to three positions of a clamp position, an unclamp position, and an upper and lower attachment / detachment position, and the operation lever is detachably attached to the pressing control member.

Therefore, according to the present invention, when the pressing control member is rotated to the clamp position by the operation of the operation lever to bring the pressing control member into contact with the pusher portion of the clamping force applying means, the clamping force applying means clamps. The force can be transmitted to the upper mold clamp, and the upper mold can be clamped by the upper mold clamp.

Further, according to the present invention, when the pressing control member is rotated to the unclamp position by the operation of the operation lever, the pressing and fixing of the upper die clamp by the upper die clamp is released, and the upper die is moved to the upper die. The holder is movably supported in the longitudinal direction.

Further, in the present invention, when the pressing control member is pivotally moved to the upper and lower attachment / detachment positions by the operation of the operation lever, the transmission of the clamp force from the clamp force applying means to the upper mold clamp is released, and the upper mold holder is released. The upper die can be attached to and detached from the device from below.

Further, according to the present invention, since the operation lever can be attached to and detached from the pressing control member, when the operation lever interferes with the bending shape of the work, the operation lever is operated so as not to interfere. The lever can be removed.

Further, in the present invention, since the stopper member for positioning the operation lever at the clamp position and the unclamp position is provided so as to be retractable from the moving area of the operation lever, the operation lever can be easily positioned and the workpiece can be easily positioned. Depending on the bent shape, it can be immersed beforehand so as not to get in the way.

Further, in the present invention, since the wedge piece that can be engaged with the fall prevention groove provided on the upper die is provided on the upper portion of the locking projection provided on the lower portion of the upper die clamp, the upper die can be moved back and forth. The play (clearance) between the provided fall prevention groove and the locking projection can be reduced, and the upper die can be prevented from falling more reliably.

Further, in the present invention, the released state holding means has a structure in which the upper mold clamp is provided with the engaging recess and the engaging recess is provided with the plunger which can be engaged and disengaged. The upper clamp can be securely held in the released state when the is removed downward.

[Brief description of drawings]

1 is a cross-sectional view of an upper die holder device according to the present invention, and FIG.
2 is a sectional view taken along line II-II in FIG.

FIG. 2 is a front view of an upper die holder device according to the present invention.

3 is a cross-sectional view taken along the line III-III in FIG.

FIG. 4 is an explanatory view of an operation when the upper die is mounted on the upper die holder device.

FIG. 5 is an operation explanatory view when the upper die is mounted on the upper die holder device.

FIG. 6 is an explanatory view of an operation when the upper die is mounted on the upper die holder device.

FIG. 7 is an explanatory view of an operation when the upper die is mounted on the upper die holder device.

FIG. 8 is an explanatory view of an operation when the upper die is removed from the upper die holder device.

[Explanation of symbols]

 1 Upper Die Holder Device 3 Upper Table 5 Upper Die 7 Holder Body 9 Upper Die Support Part 11 Upper Die Clamp 11P Locking Protrusion 13 Clamping Force Applying Means 15 Clamp Operating Means 17 Pressing Biasing Means 19 Release State Holding Means 47 Wedge Pieces 63 Pressing Control member (press screw) 65 Operation lever 71 Stopper member 79 Locking recess 81 Ball plunger

Claims (7)

[Claims] 1. An upper die supporting portion for supporting an upper die is provided at a lower portion of a holder main body detachably attached to an upper table of a press brake, and the holder main body swings around a central portion in a vertical direction as a fulcrum. A pressing portion for pressing the upper die against the upper die supporting portion is provided in the lower portion of the upper die clamp that is movably supported, and a locking projection that can be engaged with a fall prevention groove provided in the upper die is provided. Clamping force applying means for pressing the upper side of the die clamp to apply a clamping force for clamping the upper die by the upper die clamp is provided in the holder body, and the clamping force by the clamping force applying means is applied to the upper die clamp. A clamp operating means that can be transmitted to and released from the upper die is provided, and a pressing urging means that constantly urges the upper die clamp lightly in the direction of clamping the upper die is provided. Upper die holder device for press brakes. 2. An upper die supporting portion for supporting an upper die is provided at a lower portion of a holder body detachably mounted on an upper table of a press brake, and the holder body swings about a central portion in a vertical direction as a fulcrum. A pressing portion for pressing the upper die against the upper die supporting portion is provided in the lower portion of the upper die clamp that is movably supported, and a locking projection that can be engaged with a fall prevention groove provided in the upper die is provided. Clamping force applying means for pressing the upper side of the die clamp to apply a clamping force for clamping the upper die by the upper die clamp is provided in the holder body, and the clamping force by the clamping force applying means is applied to the upper die clamp. A clamp operating means that can be transmitted to and released from the upper die is provided, and a pressing urging means that constantly urges the upper die clamp in the direction of clamping the upper die is provided. An upper die holder device in a press brake, comprising release state holding means capable of holding the upper die clamp in a state in which the upper die clamp is released against the pressure urging means. 3. An upper die supporting portion for supporting an upper die is provided at a lower portion of a holder main body detachably attached to an upper table of a press brake, and the holder main body swings about a central portion in a vertical direction as a fulcrum. A pressing portion for pressing the upper die against the upper die supporting portion is provided in the lower portion of the upper die clamp that is movably supported, and a locking projection that can be engaged with a fall prevention groove provided in the upper die is provided. Clamping force applying means for pressing the upper side of the die clamp to apply a clamping force for clamping the upper die by the upper die clamp is provided in the holder body, and the clamping force by the clamping force applying means is applied to the upper die clamp. A clamp operating means that can be transmitted to and released from the upper mold is provided, and a wedge piece that can be engaged with the fall prevention groove provided on the upper mold is advanced and retracted above the locking protrusion provided on the lower part of the upper mold clamp. An upper die holder device in a press brake, wherein the upper die holder device is freely urged in a direction to engage with the drop prevention groove. 4. The clamp operating means includes a pressing control member rotatably provided on an upper part of the upper die clamp and capable of coming into contact with and separating from a pusher portion of the clamping force applying means. The clamping position for clamping the upper mold, the unclamping position where the upper mold clamp movably supports the upper mold in the longitudinal direction, and the upper and lower attachment / detachment positions where the upper mold can be vertically attached to and detached from the upper mold clamp. The upper die holder device for a press brake according to claim 1, wherein an operation lever for freely rotating the control member is provided so as to be attachable to and detachable from the pressing control member. 5. The stopper member for positioning the operation lever at the clamp position and the unclamp position is provided, and the stopper member is provided so as to be retractable from the moving region of the operation lever. Upper die holder device for the press brake of the company. 6. A wedge piece engageable with a fall prevention groove provided on the upper die is urged in an upper direction of a locking projection provided on a lower portion of the upper die clamp so as to be able to advance and retract and engage with the fall prevention groove. The upper die holder device in the press brake according to claim 1 or 2, wherein the upper die holder device is provided in the press die. 7. The released state holding means for holding the upper die clamp in a state where the upper die clamp is released is provided with a locking recess or a plunger on an upper portion of the upper die clamp, and a holder main body side supporting the upper die clamp. The upper die holder device in the press brake according to claim 2, further comprising a plunger or a locking recess that is engageable with and disengageable from the locking recess or the plunger.