JPS5925547Y2 - Mold support device in press machine - Google Patents

Description

[Detailed description of the invention] This invention relates to a mold support device in a press machine that bends a workpiece (metal plate, etc.) between an upper mold and a lower mold. In a press machine in which a rotatable eccentric shaft is provided between a supported mold support member, and the mold is raised and lowered by rotating the eccentric shaft, and the amount of deflection of the mold is finely adjusted. This invention relates to a mold support device.

In general, in a bending device such as a press brake, it is known that the longitudinal center portion of the upper mold bends upward relative to the support portions at both ends thereof during bending of the workpiece.

The causes of the bending of the upper mold include, for example, the fact that the mold support body (upper apron) that supports the upper mold is supported and suspended by frames at both left and right ends, and the reaction force of the pressing force during bending. This is thought to be due to the fact that the receiving parts are the frames at both left and right ends, and that the mold support (lower apron) that supports the lower mold receives the reaction force of the pressing force evenly during bending. There is.

As mentioned above, if the center part of the upper mold bends during the bending process, the bending angle at the center part of the workpiece becomes larger than the bending angle at both ends, resulting in the so-called sagging phenomenon, which causes the product to fail to meet product standards. The problem arises that the product cannot be manufactured.

For this reason, in the past, a wedge-shaped block member was placed in advance between the mold support and the upper mold.
An adjustment means is used to flex the central portion of the upper mold downwardly relative to both ends thereof by driving in accordance with the amount of deflection of the lower mold support (upper apron) and the lower mold support (lower apron).

However, since the above adjustment means is performed by driving a wedge-shaped block member between the mold support and the upper mold, the striking head of the block member is easily damaged, and Driving the block member requires a high degree of skill and a lot of effort, and furthermore, it is difficult to adjust it accurately.

This invention was devised to effectively solve these conventional problems, and its first purpose is to:
A rotatable eccentric shaft is interposed between the upper apron and the mold support member that supports the mold, and by rotating this eccentric shaft, the amount of deflection of the upper mold can be finely adjusted. The present invention provides a mold support device for a press machine.

The second purpose of this invention is that the amount of deflection of the mold is adjusted using an eccentric shaft instead of using a wedge-shaped block member as in the past, so the adjustment operation is extremely simple and quick. The present invention provides a mold support device for a press machine that can perform the following steps.

A third object of this invention is to provide a mold support device for a press machine that can be manufactured at a relatively low cost since it does not use a wedge-shaped block member that requires a high degree of precision.

Hereinafter, a preferred embodiment of this invention will be described based on the accompanying drawings.

FIG. 1 shows a schematic front view of a press machine 1, in which a lower mold 7 is provided on a lower apron 3 via a mold support member 5, and a lower mold 7 is provided on the lower mold 7. An upper mold 13 is suspended via a plurality of mold support members 11 attached to the upper apron 9.

As shown in FIG. 2, the upper mold 13 is a metal mold that is attached to the front side wall (on the left side in FIG. 2) of the two-part apron 9 with a fastener 15 and a fastener bolt 17 so that it can be raised and lowered. It is suspended via a mold support member 11.

On the inner wall of the mold support member 11, in a direction perpendicular to the longitudinal direction (horizontal direction in FIG. 1) of the upper mold 13,
A plurality of eccentric shafts 19 are rotatably arranged at predetermined intervals, and a worm wheel 23 is integrally provided at the center of each of these eccentric shafts 19. The shaft center of is eccentrically provided, and the eccentric shaft 1
9 and the worm wheel 23 form a step on the outer periphery,
In addition, a gear part 2 is attached to a part of the outer circumference of the worm wheel 23.
1 is provided.

The upper part of the worm wheel 23 is surrounded by a pressure receiving plate 25, and the eccentric shaft 19 protruding from both ends of the worm wheel 23 is connected to the side surface of the mold support member 11 and the support bolt 27 between the mold support member 11 and the support bolt 27. It is rotatably supported by a side surface of a support plate 29 which is disposed oppositely therebetween.

A worm 31 that constantly meshes with the gear part 21 of the worm wheel 23 is provided at the lower part of the worm wheel 23. Both ends of a worm shaft 33, which is integrally formed with the worm 31, are connected to the upper mold 13. It is rotatably supported by the pressure receiving plate 25 in parallel with the longitudinal direction.

A knob 37 with a scale 35 engraved on the outer peripheral surface is attached to the worm shaft 33 protruding from one side of the pressure receiving plate 25, and the pressure receiving plate 2 faces the scale 35 engraved on the knob 37.
5, a pointer 39 is attached to the side of the mold support member 11 so as not to interfere with the mold support member 1].

Also, a mold support member 1 rotatably supports the eccentric shaft 19.
The outer wall of the eccentric shaft 19 is engraved with a scale 41 for reading the rotation angle of the eccentric shaft 19, and the end face of the eccentric shaft 19, which is in sliding contact with the circumferential surface provided with the scale 41, is marked with an arrow that serves as a guide. 43
is engraved.

The upper part of the pressure-receiving support plate 45 is suspended between the mold support member 11 below the worm shaft 33 provided with the form 31 and the support plate 29 via the support bolt 27, and the intermediate part , the fastener 15 and the fastener are fixed with bolts 17.

The lower end surface of this pressure-receiving support plate 45 contacts the newly curved upper surface 47 on the upper mold 13, and the protrusion 49 provided on the side wall contacts the lower surfaces of the mold support device 11 and the support plate 29. ing.

Next, a method of operating this device having the above-described configuration will be explained.

First, when bending a predetermined position of the upper mold 13 by a predetermined amount with respect to the lower mold 7, the knob 3
While reading the scale 35 of 7, rotate it by a predetermined angle.

When the knob 37 is rotated, the worm wheel 23 is rotated by a predetermined angle via the worm shaft 33 and the worm 31, and at the same time, the eccentric shaft 19 is rotated about the rotation center O of the worm wheel 23 as a fulcrum.

When this eccentric shaft 19 rotates and its rotation center 01 starts to descend, the mold support member 11 and support plate 29 that support the eccentric shaft 19 descend, and at the same time, the lower surface of the mold support member 5 and the support plate 29 descend. The upper mold 13 is lowered via the pressure receiving support plate 45 that comes into contact with the lower surface of the plate 29.

That is, the amount of descent (deflection ε) of the upper mold 13 is
9 eccentricity, that is, the rotation center O of the worm wheel 23
This corresponds to the distance l between the eccentric shaft 19 and the rotation center 01.

Therefore, by reading the scale 35 of the knob 37 and the rotation angle of the eccentric shaft 19 with the scale 41 provided on the mold support member 11, the amount of deflection ε of the upper mold 13 can be accurately adjusted. .

In addition, although the above embodiment has been described in detail regarding the case where the amount of deflection ε of the upper mold 13 is adjusted, it is also possible to adjust the amount of deflection ε of the lower mold 7 by using a similar configuration.

Furthermore, in the embodiment of this invention, a case has been described in which the knob 37 is manually operated as a means for rotating the eccentric shaft 19, but one end of the worm shaft 33 is connected to an output shaft of an electric motor etc. The shaft 19 may also be rotated.

As described above, this invention provides a rotatable eccentric shaft 19 between the aprons 9, 3 and the mold support members 11, 5, and by rotating the eccentric shaft 19, the mold 13,7
Since the amount of deflection ε is adjusted, the following excellent effects can be achieved.

■ The amount of deflection ε can be adjusted without using a wedge-shaped block member as in conventional equipment, making it extremely easy and quick to adjust the amount of deflection ε, improving work efficiency. can be achieved.

■ Also, the scale 35 provided on the knob 37 and the mold support member 1
Since the amount of deflection ε can be adjusted while reading the scale 41 provided at 1, fine adjustment is possible and products with high precision can be processed.

(2) In addition, each component does not require higher precision than conventional block members, and it also does not break, making it possible to improve the durability of the adjustment device.

[Brief explanation of the drawing]

The drawings show a preferred embodiment of this invention; FIG. 1 is a schematic front view of the press machine, FIG. 2 is a partially longitudinal side view showing how the upper mold is installed, and FIG. III-III
It is a partially vertical front view taken along a line. Explanation of main symbols shown in the drawings, 3... Lower apron, 5, 11... Mold support member, 7... Lower mold, 9... Upper apron, 13... Upper mold, 19
...Eccentric shaft, 23...Worm wheel, 31...
・Worm, 33... Worm axis.

Claims (1)

[Scope of utility model registration request] A mold is installed on the apron via a mold support member,
An eccentric shaft 19 is rotatably interposed between the apron and the mold support member, and by rotating the eccentric shaft 19, the mold is raised and lowered via the mold support member. A mold support device in a press machine.