JPH0222095Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is based on a wear plate that is interposed between a movable member and a fixed member of a press die and contributes to wear resistance and clearance adjustment between the two members. This relates to the mounting structure.

(Prior Art) As a conventionally known wear plate mounting structure for a press mold, there is one shown in FIG. 3, for example.

In the figure, 1 indicates a pad as an example of a movable member, and 2
1 and 2 respectively show an upper mold holder as an example of a fixing member that guides the reciprocating movement of this pad in the vertical direction.

Here, the pad 1 is pressed downward against the upper mold holder 2 by the elastic means 3, and when the pad 1 comes out of the upper mold holder 2, it penetrates the side wall of the upper mold holder 2. This is prevented by the pad retainer 4 which projects into the side wall of the pad 1.
Although this pad retainer 4 prevents the pad 1 from coming off, it does not restrict its upward movement by a predetermined amount with respect to the upper mold holder 2.

In addition, 5 in the figure indicates the upper mold holder 2 on the outside of the pad 1.
The sectional die attached to the bottom of the 6
1 and 2 respectively show wear plates interposed between the pad 1 and the upper mold holder 2. As shown in an enlarged cross-sectional view in FIG. It acts to prevent wear of the parts 2 and to provide an appropriate clearance between them.

Further, in the figure, 8 is the lower mold holder, 9 is the pad 1
10 shows a punch fixed to the lower die holder 8 at a position opposite to the punch 9, and 10 shows a workpiece placed on the punch 9.

The wear plate 6 attached in this manner allows the pad 1 to rise relative to the upper die holder 2 based on the contact between the pad 1 and the workpiece 10 as the upper die holder 2 descends. Therefore, as the upper mold holder 2 continues to descend, the sectional die 5 can perform required processing such as bending and shearing on the workpiece 10.

(Problems to be Solved by the Invention) However, in this prior art, the wear plate 6 is bolted to the pad 1, and there is no sliding movement between the wear plate 6 and the upper die holder 2. clearance is generally 0.2~0.5mm
Since it is designed to have a value within a small range of
It is extremely difficult to fit the pad 1 into the upper die holder 2, and on the other hand, the pad 1 attached to the upper die holder 2 has a gap of 0.4 to 1.0 mm with respect to the holder 2 due to the existence of the above-mentioned clearance. There is a problem that the product may shift in either direction within the range, resulting in a defect called mold hit on the surface of the product.

Conventionally, when such a mold hit occurred, production was stopped and the pad part that caused the mold hit was ground with a grinder, for example, and then production was resumed, but when the mold hit occurred on the product surface, Since the position changes from lot to lot, in other words, it changes depending on how the pad 1 is attached to the upper mold holder 2, it has not been possible to fundamentally solve the above problem with such measures.

(Means for Solving the Problems) The press mold wear plate mounting structure of this invention is particularly designed to attach a wear plate interposed between a movable member and a fixed member to one of them. It is attached and pressed toward the other member.

Note that the fixed member herein includes not only one that literally does not move at all, but also a member that stops moving when the movable member moves.

(Function) According to the wear plate mounting structure of this invention,
When attaching the movable member to the fixed member, by restraining the wear plate in its retracted position, in other words, in its inactive position, with bolts, hoops, etc. against the pressing force, a small amount of clearance can be created between the two members. Even in the presence of , the extra clearance is taken up by the wear plate, and the uneven mounting of the movable member is effectively prevented, and as a result, the impression of the surface of the finished product is also sufficiently prevented.

On the other hand, the wear plate here also compensates for the wear of itself and the members it comes into contact with by the pressing force that is applied to it, so the processing accuracy of the press mold can be maintained over a long period of time. At the same time, the number of man-hours and costs for maintenance and repair can be reduced.

(Example) This invention will be explained below based on the drawings.

FIG. 1 is a longitudinal cross-sectional view of a main part showing an embodiment of this invention, in which 21 represents a pad as an example of a movable member, 22 represents an upper mold holder as an example of a fixed member, and 23 represents a pad holder as an example of a fixed member. shows a wear plate interposed between the pad 21 and the upper mold holder 22.

In this example, the wear plate 23 having a flange 23a at the rear end is arranged so as to be movable in a recess 21a provided in the pad 21, and the retractable limit position of the wear plate 23 is set to the bottom wall 21 of the recess 21a.
b, and the forward limit position is specified by a stopper 21c provided on the outer surface of the pad 21 and in contact with the flange 23a, and furthermore, this wear plate 23 is arranged behind the wear plate 23 within the recess 21a. A spring, rubber, or other elastic means 24 biases it toward its advancing direction, in other words, toward the upper mold holder 22 . As a result, the wear plate 23 protrudes to the forward limit position in its normal state.

Furthermore, in this example, the pad 21 is attached to the upper mold holder 2.
For the purpose of restraining the wear plate 23 in its retracted position when fitting the wear plate 23 into the
3 is provided with a female threaded portion 25 extending in the front-rear direction, and a bolt hole 26 is provided at a position corresponding to the female threaded portion 25 of the pad 21. According to this configuration, by screwing a bolt (not shown) inserted into the bolt hole 26 into the female threaded portion 25, the wear plate 23 can be brought to a desired retracted position and maintained there.

According to this mounting structure of the wear plate 23, when the pad 21 is fitted into the upper mold holder 22, the wear plate 23 is restrained in the retreated position, thereby effectively preventing the wear plate 23 from protruding from the pad 21. Therefore, in the presence of a relatively large predetermined clearance between the pad 21 and the upper mold holder 22, the fitting can be performed extremely easily. After the fitting operation is completed, the bolt (not shown) is removed and the wear plate 23 is pressed against the upper mold holder 22 by the action of the elastic means 24, thereby increasing the clearance between the pad 21 and the upper mold holder 22. , is absorbed by the relative displacement of the wear plate 23 with respect to them, so there is no risk that the pad 21 will be placed one-sidedly with respect to the upper die holder 22, regardless of how the pad 21 is fitted. Therefore,
In subsequent processing operations, the pad 21 is always moved up and down at a predetermined position while the wear plate 23 is sliding against the upper die holder 22, and the pad 21 is constantly moved up and down at a predetermined position. No mold hit occurs, and no work is required to remove the mold hit.

In addition, in such a fitted state of the pad 21, the wear plate 23 pressed toward the holder 22 effectively absorbs its own wear and the wear of the upper mold holder 22, so that the wear plate 23 presses toward the holder 22. There is no possibility that the pad 21 will shift to one side due to wear.

FIG. 2 is a cross-sectional view showing an example of application of this invention, and the example shown in FIG. While the wear plates 6, 6 similar to those described above are provided, wear plates 23 having the mounting structure according to this invention are provided at two locations on the sides of the pad 21 that are farthest from the corners thereof. Note that 4 in the figure indicates a pad retainer similar to that described in the prior art. Further, in the example shown in FIG. 2b, two wear plates 6, 6 are provided on each adjacent side of the pad 21 having a rectangular cross-sectional shape, and two wear plates 6 are provided on each of the other sides. This is equipped with wear plates 6, 6.

In any of these application examples, by restraining the wear plate 23 in its retracted position, the pad 21 can be easily fitted into the upper mold holder 22, and after the fitting is completed, the wear plate 23 is By releasing the restraint of the plate 23, under the clearance absorption effect of the wear plate 23,
The pad 21 can be brought into position horizontally relative to the upper mold holder 22.

Although not shown in the drawings, if the wear plate 6 shown in FIG. , the pad 21 can be reliably maintained at a predetermined relative position with respect to the upper mold holder 22.

This invention has been explained above based on illustrated examples, but
It is also possible to press the wear plate attached to the fixed member toward the movable member, or to use a hoop wrapped around the pad as a means for restraining the wear plate in the backward position, and an elastic means for pressing the pad. It can also be an air spring, a rubber-like elastic body, etc. having the required spring constant.

Furthermore, the structure of this invention can be applied not only between the pad and the upper mold holder, but also to other sliding parts in the press mold.

(Effect of the invention) Therefore, according to this invention, the wear plate is attached to one of the movable member or the fixed member and is pressed toward the other member, so that the wear plate is restrained in the retreated position. This makes it extremely easy to fit the movable member to the fixed member, and after the fitting, the wear plate is energized to its extended position.
The clearance between both members is sufficiently absorbed by the wear plate, and therefore, the deviation of the movable member with respect to the fixed member is effectively eliminated.

Furthermore, the wear plate, which is energized by elastic means, compensates for its own wear and the wear of the members on which it slides to maintain the relative position of the movable member relative to the fixed member in position over an extended period of time. can be maintained.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a main part showing an embodiment of this invention, Fig. 2 a and b are cross-sectional views showing an application example of this invention, and Fig. 3 a and b are longitudinal cross-sectional views showing a conventional example, respectively. They are a top view and an enlarged view of the main parts thereof. 21...pad, 22...upper mold holder, 23...
...Wear plate, 24... Elastic means, 25...
Female thread part, 26...bolt hole.

Claims (1)

[Scope of utility model registration request] A wear plate 23 interposed between the movable member 21 and a fixed member 22 that guides the reciprocating movement of the movable member 21 is attached to either one of the members 21 and 22 and is oriented toward the other member. Wear plate mounting structure for press molds.