JPH0839148A - Punch for press brake - Google Patents

Abstract

PURPOSE:To enable secure pressing and fixing of a punch by providing a punch mounting part with a wedge-shaped part formed to a shape having the thickness larger in the cross sectional shape on the lower side than on the upper side. CONSTITUTION:A bent part PV is formed at the top end of the punch P and a stepped joint surface Po engaging with a holder plate 9 is formed on the rear surface side of the upper part. This joint surface PO is formed to a stepped joint surface by having a perpendicular surface and a horizontal surface and forming these surfaces to an L shape. A slope PS with which a pressing and fixing member 17 comes into sliding contact is formed on the front surface side of the upper part of the punch P. This slope PS is formed with a taper in such a manner that the thickness is larger toward the lower side. The top end of the punch P is projectingly provided with a hook part PF. The mounting part PM of the punch P is designed to have the wedge-shaped part of the shape made larger in the thickness of the sectional shape on the lower side than on the upper side by forming the slope PS. As a result, the spacing between the holder plate and the pressing and fixing member is forced to be widened and the punch is securely fixed by the reaction thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an upper die for a press brake, and more specifically, by raising the upper die relative to the die holder, the upper die is firmly fixed to the die holder. Regarding the upper mold that can be fixed to.

[0002]

2. Description of the Related Art Conventionally, an upper die of a press brake is joined to a holder plate 101 to which the upper die P is joined by a stepped portion P _D formed on the upper die P as shown in FIG. , Tightening bolt 10 screwed to the holder plate 101
A clamp, which is the press-fixing member 105, is provided via 3. Then, the upper mold P is fixed by the pressing fixing member 105 by tightening the tightening bolt 103.

To mount the upper die P on the holder plate 101, the stepped portion P _D of the upper die P is inserted between the pressing fixing member 105 and the holder plate 101 in the longitudinal direction. At this time, a gap B is provided between the pressure fixing member 105 and the front surface side of the upper mold P. After inserting the upper mold P, tighten bolt 1
03 is lightly tightened to raise the lower mold D, the upper mold P is pushed up by the V surface of the lower mold D, the gap A is made zero, and then the tightening bolt 103 is tightened again to finish the mounting of the upper mold P. Was there.

[0004]

By the way, in order to mount and dismount the upper die of the conventional press brake described above, a very troublesome operation is required, and the tightening bolt 103 has a long die P. There are many of them, for example, there are about 30 in an average machine. When mounting the upper mold P, all the tightening bolts 103 must be tightened. It is necessary to insert a wrench or the like into the attached bolt 103 and loosen one by one to remove the upper mold P. Therefore, it takes a lot of manpower and time to replace the upper mold P, and there is a problem that workability cannot be improved.

SUMMARY OF THE INVENTION An object of the present invention is to provide an upper die for a press brake, which can improve workability by enabling the upper die to be attached to or detached from the holder plate with one touch in order to solve the above problems. is there.

[0006]

In view of the conventional problems as described above, the present invention provides an upper die for a press brake having a working portion for bending a plate material in cooperation with a lower die at a lower end edge thereof. In the above, the upper die mounting portion with respect to the press brake is provided with a wedge-shaped portion whose cross-sectional shape is thicker on the lower side than on the upper side.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings. Since the press brake has a known structure, illustration and description thereof will be omitted.

First, the upper mold which is the main part of the present invention will be described.

Referring to FIG. 1, a bent portion P _V is formed at the tip of the upper die P, and the back side of the upper portion of the upper die P (see FIG.
On the right side of the figure), a stepped contact surface P _{D that} is engaged with a holder plate described later is formed. As will be understood from FIG. 1, this contact surface P _D is formed into an L-shaped contact surface having a vertical surface and a horizontal surface to form a stepped contact surface.

Further, an inclined surface P _S is formed on the upper surface side of the upper mold P (on the left side in FIG. 1) to which a pressing fixing member described later is in sliding contact. The inclined surface P _S is inclined so that the thickness becomes thicker toward the lower side. A hook portion P _F serving as a locking portion is provided so as to project from the upper end portion of the upper mold P.

As is apparent from FIG. 1, the mounting portion PM of the upper die P has a wedge-shaped portion whose cross-sectional shape is thicker in the lower side than in the upper side due to the formation of the inclined surface P _S. It is a configuration provided with.

The upper mold P shown in FIG. 2 is another embodiment example, and this embodiment example is a type in which the thickness of the upper mold P is thicker than that of the above-mentioned embodiment example, and the structure Are completely the same, the same reference numerals are given and the description thereof is omitted.

The structure for assembling the upper die P as described above to the press brake will be described in detail.

Referring to FIGS. 3 and 4, the mold holder 1
Is attached to a lower portion of an upper table 3 of a press brake (not shown) via a fixture 5 so as to be vertically adjustable.

More specifically, a support plate 7 is mounted on the front surface of the upper table 3 through the fixture 5 so as to be adjustable in the vertical direction, and a holder plate 9 is provided on the lower rear surface of the support plate 7 with a plurality of bolts 11. It is attached integrally by. Between the upper surface of the holder plate 9 and the lower surface of the upper table 3, a wedge member 1 for vertically adjusting the mold holder 1 is provided.
3 is interposed.

The holder plate 9 is provided with a mounting bolt 1
A plate-shaped pressing and fixing member 17 is swingably attached via 5. A spherical washer 19 is interposed between the pressure fixing member 17 and the head portion 15H of the mounting bolt 15, and
Between the holder plate 9 and the pressure fixing member 17,
A spring 21 that acts to separate the two is mounted.

At the lower end of the pressing and fixing member 17, an abutting member 23 that abuts the inclined surface P _S formed on the upper die P is attached by a bolt 25. And this contact member 23
In order to urge the holder plate 9 against the inclined surface P _S of the upper mold P, the holder plate 9 is provided with a pressing urging device 27 having an appropriate structure.

More specifically, a large-diameter hole 9H is formed in the upper part of the holder plate 9 on the front side (left side in FIG. 3).
Is formed in the hole 9H, and an elastic body supporting member 2 such as a bolt whose disk-shaped head is in contact with the bottom of the hole 9H.
There are 9 interiors. A strong elastic member 33 such as a coil spring, a disc spring, or urethane rubber is elastically mounted between the elastic body supporting member 29 and the spring seat 31 which slidably penetrates.

A nut 35 for preventing the spring seat 31 from coming off is screwed and fixed to the tip of the elastic body supporting member 29.

The spring seat 31 includes the nut 35.
Is attached to a cylindrical movable block 37 in which is accommodated, and the movable block 37 is in contact with the tip of an adjusting screw 39 screwed onto the upper portion of the pressing and fixing member 17. An operation lever 41 is fixed to the adjusting screw 39, and a restriction pin 43 for restricting the rotation range of the operation lever 41 is planted in the support plate 7. The pressure fixing member 1 is provided at a plurality of locations on the holder plate 9.
7, the regulating member 45 for regulating the upward movement of the bolt 4
It is attached by 7.

In the configuration as described above, the operation lever 4
When 1 is rotated to the right in FIG. 4 and the adjusting screw 39 is screwed in, the movable block 37 is pressed by the adjusting screw 39 to compress the elastic member 33, so that the accumulating force of the elastic member 33 increases.

On the other hand, the lower table 49 is provided with a lower metal D, and the lower metal D has a bending die D _V having substantially the same shape as the bending portion P _V provided on the upper die P described above. be formed, it desired bending the plate material is subjected by the bending tool D _V and folded to form the upper mold P bent portion P _V cooperation.

In the above-mentioned construction, the action is that the elastic force of the elastic member 33 is increased as described above, and the pressing and fixing member 1 is actuated by the action of the spring 21.
When the space between the lower end of 7 and the holder plate 9 is open, the pressing fixing member 17 and the holder plate 9 are
The upper mounting portion of the upper mold P is inserted between and. Then, the hook portion P _F provided on the upper end portion of the upper die P is pressed and fixed by the pressing and fixing member 17
The lower protrusion 17P is locked and supported.

As described above, after the mounting portion of the upper die P is inserted between the pressing and fixing member 17 and the holder plate 9, between the horizontal plane of the contact surface P _D of the upper die P and the lower surface of the holder plate 9. In order to make the gap A zero, the upper table 3 is lowered or the lower table 49 is raised so that the bending die D _V of the lower die D mounted on the lower table 49.
The processed portion P _V of the upper mold P is engaged with the upper mold P to raise the upper mold P relative to the holder plate 9 and the like.

[0025] As described above, when allowed to relatively increase the upper mold P with respect to the holder plate 9 or the like, contact with the lower end of the pressing fixation member 17 by the inclined surface P _S in the mounting portion of the upper mold P The member 23 is pressed against the urging force of the pressing urging device 27 and gradually moved in the X arrow direction (left direction) in FIG. When the lower part of the pressure fixing member 17 is pressed and moved as described above, the pressure fixing member 1
7 is swung clockwise in FIG. 3, and the adjusting screw 39 pushes the movable block 37.

When the movable block 37 is pushed and moved, the elastic member 33 is gradually compressed, and the stored force thereof is gradually increased. Therefore, the contact member 23 provided under the pressing and fixing member 17 gradually and strongly presses the upper mold P against the holder plate 9 by the increasing reaction force of the elastic member 33, and the upper mold P presses. It will be fixed.

Since the vertical dimension of the inclined surface P _S of the upper die P is larger than the gap A as can be understood from FIG. 1, when the gap A is set to zero and the upper die P is pressed and fixed, The lower part of the pressing and fixing member 17 is in the maximum moved state, and the elastic force of the elastic member 33 is maximum. Therefore, the upper mold P is reliably fixed by pressing.

That is, according to this embodiment, the upper die P can be easily and firmly attached to the die holder 1 with one touch without using a tool or the like, and the workability is improved. Can be planned.

When removing the upper die P mounted on the die holder 1, the operation lever 41 is rotated to the left side in FIG. When the operation lever 41 is rotated as described above, the adjustment screw 39 moves backward to release the pressing of the movable block 37, and the reaction force due to the accumulating force of the elastic member 33 becomes weak.

Therefore, the pressing force of the upper die P by the contact member 23 is reduced, and the upper die P can be easily removed.

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

[0032]

As can be understood from the above description, the present invention is essentially a press brake upper die having a working portion for bending a plate material in cooperation with the lower die at the lower end edge. This is a configuration in which the upper die mounting portion for the press brake has a wedge-shaped portion whose cross-sectional shape is thicker on the lower side than on the upper side.

Therefore, when the mounting portion of the upper die is positioned between the holder plate and the pressing and fixing member of the die holder and the upper die is raised relative to the holder plate, the mounting portion has Since the cross-sectional shape is provided with a wedge-shaped portion in which the lower side is thicker than the upper side, the wedge-shaped portion is pushed and widened between the holder plate and the pressing and fixing member, and the reaction force of the upper die It is a strong fixing.

That is, according to the present invention, after the upper die mounting portion is positioned between the holder plate and the pressing and fixing member, the upper die is simply raised relative to the holder plate. Therefore, the upper mold can be firmly pressed and fixed to the holder plate.

[Brief description of drawings]

FIG. 1 is a side view of an upper die showing a main part of the present invention.

FIG. 2 is a side view of an upper die showing another embodiment example according to the present invention.

FIG. 3 is a side cross-sectional explanatory view of a mold holder in which an upper mold is mounted on the press brake according to the embodiment of the present invention.

FIG. 4 is a front explanatory view of the mold holder of the above.

FIG. 5 is a side cross-sectional explanatory view of a mold holder on which an upper mold is mounted, showing a conventional example.

[Explanation of symbols]

3 Upper table 9 Holder plate 17 Press fixing member P Upper die P _D Contact surface P _S Inclined surface PM Mounting part

Claims (1)

[Claims] 1. An upper die for a press brake having a working portion for bending a plate material in cooperation with a lower die at a lower end edge, wherein a mounting portion of the upper die for the press brake has a cross-sectional shape from an upper side. Also, an upper die for a press brake, which is configured to have a wedge-shaped portion in which the lower side is thicker.