JPH0337781Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a mold clamping device for a bending machine, and more specifically, the present invention relates to a mold clamping device for a bending machine, and more specifically, the present invention relates to a mold clamping device for a bending machine. This invention relates to a device for clamping a mold such as a metal mold to a table.

[Technical background of the invention and its problems] Conventionally, in a machine that bends a workpiece in a press process, for example, a so-called press brake that works together with a lower mold to bend the workpiece into a V-shape, etc. , an upper mold having a convex shape such as a V-shape.

In this upper mold, a support member and a clamp provided at the lower end of a fixed apron hanging down from the upper part of the press body were clamped and fixed by a plurality of fastening members (for example, bolts, etc.).

In the case of such a crank type, since it is removed from or attached to the support member when replacing the mold, the larger the machine, the more it becomes necessary to operate more clamps.

The number of tightening bolts used to secure the clamping metal is large, and it takes a lot of time to tighten and loosen them.

In order to solve this problem, it may be possible to use a hydraulic cylinder to clamp or unclamp the mold, but this method has disadvantages such as the cylinder body protruding from the clamp and hitting the workpiece when bending. is the current situation.

The present invention was devised in view of the above-mentioned problems, and its purpose is to provide a clamping device that utilizes a wedge effect as a clamping device for molds, has simple operation,
Another object of the present invention is to provide a mold clamping device for a bending machine that can clamp reliably and greatly reduce the number of man-hours.

[Means for Solving the Problem] In order to achieve the above objectives, this invention forms a groove in the support member provided at the bottom of the upper table of the bending machine, into which the upper mold can be attached from below. The locking surface of the clamp lever, which is rotatably supported vertically via a pin near the bottom of the support member, is provided so as to protrude into the groove, and the locking surface is higher than the pin. The clamp lever is provided in contact with an inclined surface formed on the upper mold at a position, and the clamp lever is biased in the direction of pressing the inclined surface by the above-mentioned locking surface.

With the above configuration, the upper mold can be easily installed in the groove of the support member by inserting the upper mold into the groove of the support member from below and pushing up the locking surface of the clamp lever against the biasing force. can. After the upper mold is installed, the locking surface of the clamp lever comes into contact with the inclined surface of the upper mold and is pressed.
When the upper mold tries to separate downward from the groove of the support member, the friction between the inclined surface and the locking surface causes the locking surface side to rotate downward, and the upper mold is removed by the locking surface. This increases the pressing force of the mold and prevents the upper mold from separating from the groove.

Note that by releasing the engagement surface of the clamp lever from the inclined surface of the upper mold, the upper mold can be easily removed from the groove of the support member.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

Referring to FIGS. 1 and 2, the press brake 1 includes a movable lower table 7 that is moved up and down by a hydraulic cylinder 5 at the lower part of the machine body 3, and a support member 9 is mounted on the upper part of the movable lower table 7. It is fixedly attached to the lower mold 11 via.

Further, an upper mold 17 is fixed to the lower end of the fixed upper table 13 hanging from the upper part of the fuselage 3 via a support member 15, and the upper mold 17 and the lower mold 11 cooperate to cover each other. The workpiece W is bent.

Furthermore, clamp devices 19 and 21 are provided at a plurality of locations to secure the upper mold 17 and the lower mold 11. More specifically, as shown in FIGS. 3 and 4, one embodiment of the clamp device 19 supports a support member 15 (one part not shown) provided at the lower end of the fixed upper table 13. The constituent members 15a and 15b include a plurality of bolts 2
3 and into which the upper mold 17 is loosely fitted.
5 is formed.

A sloped surface 27 is provided on the left side of the upper mold 17 in FIG. It is formed with a slope.

The clamp lever 31 constituting the clamp member 29 that engages with this inclined surface 27 is attached to the support member 15b.
It is rotatably supported on a pin 35 that extends horizontally through a notch 33 provided in the.

Note that a tensioned spring 37 is attached to the pin 35, one free end of the spring 37 is locked to a pin 39 implanted in the side wall of a notch 33 provided in the support member 15b, and the other end is attached to a clamp lever. 31
The clamp lever 31 is always urged clockwise as shown in FIG.

With the above configuration, as is clear from FIG. 4, the locking surface 43 provided on the clamp lever 31 comes into contact with and presses the inclined surface 27 at a position higher than the pin 35, and strongly clamps the upper mold 17 due to the wedge effect. I will do it.

That is, when the upper mold 27 tries to separate from the groove 25 due to its own weight, the inclined surface 27 and the locking surface 43
The clamp lever 31 is rotated clockwise in FIG. 4 due to the friction between the clamp lever 31 and the locking surface 43, which increases the pressing force exerted by the locking surface 43 and prevents the upper mold 27 from coming off.

Further, the clamp device 19 shown in FIG. 5 has a configuration in which a plurality of divided upper molds 17 are clamped and fixed by clamp members 29, respectively. Since the structure is almost the same as that shown in FIGS. 3 and 4 except that the lower die 17 is a split die, detailed explanation will be omitted.

Furthermore, FIG. 6 shows another embodiment in which an eccentric bushing is installed at the rotational fulcrum of the clamp lever 31 when the joint surface between the locking surface 43 and the inclined surface 27 of the clamp lever 31 does not meet the required precision in machining. 45 was installed and configured. Since the other configurations are substantially the same as those in FIG. 4, detailed explanation will be omitted.

By rotating this eccentric bushing 45 and adjusting the eccentric position, the locking surface 43 of the clamp lever 31 is
It is possible to idealize the joining accuracy between the slanted surface 27 and the inclined surface 27.

In any case, to release the clamping with the upper mold 17, pull the handle part 49 of the clamp lever 31 against the elastic force of the spring 37 to release the clamping, and replace the mold with a simple operation. can be done.

In addition, in this example, the case where the lower mold is raised to perform the bending process has been explained, but it can also be used in the case where the upper mold is lowered to perform the bending process, and the clamping device is Although we have explained the mold, it can also be used for the lower mold.

[Effects of the invention] As can be understood from the above description of the embodiments, the present invention is capable of attaching the upper mold 17 from below to the support member 15 provided at the lower part of the upper table 13 of the bending machine. A groove 25 is formed and provided, and a pin 35 is provided near the bottom of the support member 15.
The locking surface 43 of the clamp lever 31, which is rotatably supported in the vertical direction through the groove 25, is provided by protruding into the groove 25, and the locking surface 43 is attached to the upper mold 17 at a position higher than the pin 35. The formed slope 27
The locking surface 43 urges the clamp lever 31 in the direction of pressing the inclined surface 27.

With the above configuration, in the present invention, the upper mold 17 is inserted into the groove 25 of the support member 15 from below,
By pushing up the locking surface 43 of the clamp lever 31 against the urging force, the groove 25 of the support member 15 is closed.
The upper mold 17 can be easily attached to the upper mold 17. After installing the upper mold 17, the upper mold 1
The locking surface 4 of the clamp lever 31 is attached to the inclined surface 27 of 7.
3 are in contact with each other and are pressed and biased, so when the upper mold 17 tries to separate downward from the groove 25 of the support member 15, it is locked due to the friction between the inclined surface 27 and the locking surface 43. The stop surface 43 side is rotated downward, and the pressing force of the stop surface 43 on the upper mold 17 increases, thereby preventing the upper mold 17 from coming off from the groove 25. In addition, upper mold 1
By releasing the locking surface 43 of the clamp lever 31 from the inclined surface 27 of the upper mold 17, the upper mold 17 can be easily removed from the groove 25 of the support member 15.

That is, according to the present invention, the groove 2 of the support member 15
The upper mold 17 can be attached to the mold 5 in a single touch, and the upper mold 17 can be reliably prevented from coming off due to its own weight or the like.

[Brief explanation of the drawing]

Figures 1 and 2 show a press brake incorporating the present invention, with Figure 1 being a front view and Figure 2 being a front view of the press brake.
It is a sectional view along the - line of a figure. 3 and 4 show an embodiment of the clamp device according to the present invention, FIG. 3 is a front view, and FIG. 4 is a -
It is a sectional view along a line. FIG. 5 is a front view showing an embodiment in which a split mold is equipped with a clamping device according to the present invention. FIG. 6 is a sectional view showing another embodiment in place of FIG. 4. [Explanation of symbols representing main parts of drawings] 15
... Support member, 17 ... Upper mold, 19 ... Clamp device, 27 ... Inclined surface, 29 ... Clamp member.

Claims (1)

[Scope of utility model registration request] A support member 15 provided at the lower part of the upper table 13 of the bending machine is provided with a groove 25 in which the upper mold 17 can be freely attached from below, and a pin 35 is provided near the lower part of the support member 15 in the vertical direction. The locking surface 4 of the clamp lever 31 is rotatably supported on the
3 is provided so as to protrude into the groove 25, and a locking surface 43 is provided in contact with the sloped surface 27 formed on the upper mold 17 at a position higher than the pin 35, and the locking surface 43 is provided so as to be in contact with the sloped surface 27 formed on the upper mold 17. A mold clamp device for a bending machine, characterized in that a clamp lever 31 is biased in a direction to press a surface 27.