JPH0467490B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to improvements in the structure of a rubber pad forming press used, for example, in forming ceramic green sheets. The present invention relates to an improvement in a mounting structure for a rubber member.

[Prior Art] FIGS. 3 and 4 are schematic cross-sectional views showing an example of a conventionally used rubber pad forming device. This rubber pad forming device is constructed in a tunnel 2 extending from the front of the paper to the back of the paper, and mainly includes a punch 4 on which a workpiece 3 is placed and a rubber pad 5 placed opposite the punch 4. It is a constituent element.

A first rubber member 6 is attached to the punch 4 as shown in FIG. The workpiece 3 is placed on this rubber member 6. A mold 8 is arranged around the work 3, the first rubber member 6, and the punch 4, and the mold 8 is used to press the work 3 during pressing.
and is provided to prevent the first rubber member 6 from escaping laterally.

On the other hand, on the rubber pad 5 side, there is a diaphragm 1 filled with oil 11 as a pressure medium.
2 is provided. The diaphragm 12 is made of, for example, urethane-based or neoprene-based rubber, and is configured so that it can bulge outward with the oil 11 when pressurized. A second rubber member 13 is attached to the outside of the diaphragm 12. The rubber member 13, together with the diaphragm 12, is configured to bulge outward when pressurized, and comes into contact with the workpiece 3 to press the workpiece 3, as shown in FIG.

The mold 15 is configured to be expanded by the second rubber member 13 and pressed against the inner wall of the tunnel 2 when pressurized. Also, 1
Reference numeral 6 denotes a movable mold, which is provided to prevent the second rubber member 13 from protruding outside when pressurized. The movable mold 16 is normally urged upward by a compression spring 18 fitted onto the fixed pin 17. Therefore, during pressurization, the movable mold 16 is pressed outward and downward by the second rubber member 13, thereby moving downward against the compression spring 18, so that its lower end surface is pressed against the mold 8. is in contact with the top surface of the By this, the second
The rubber member 13 is configured to be prevented from protruding outward.

[Problems to be Solved by the Invention] In the above-described rubber pad forming press device, from the state before pressurization schematically shown in FIG.
After applying pressure, it is required that the second rubber member 13 cooperates with the first rubber member 6 to uniformly press the workpiece 3, as shown in FIG.

However, in reality, as shown in FIG. 8, the peripheral edge of the first rubber member 6 enters between the side surface of the punch 4 and the inner wall of the mold 8, and accordingly The workpiece 3 on the member 6 was also deformed so that its peripheral edge hung downward, making it difficult to press it uniformly. Furthermore, since the peripheral edge of the first rubber member 6 deforms as shown in the figure,
One pressurizing operation may break the peripheral edge, and the amount of deformation of the second rubber member 13 also increases at the peripheral edge, so the second rubber member 13
Their lifespans also tended to be shortened. In addition, if the amount of the first rubber member 6 flowing into the gap between the side surface of the punch 4 and the inner wall of the mold 8 is extremely large, the first rubber member 6 may be damaged after the pressurizing operation. In some cases, it was even impossible to take out punch 4 without giving it some damage.

Therefore, as shown in FIG. 9, it is conceivable to attach a first rubber member 6A that is smaller than the upper surface of the punch 4. However, in this case, in the pressurized state, the workpiece 3 enters the gap between the side surface of the first rubber member 6A and the mold 8,
Work 3 cannot be pressed accurately. Furthermore, since the amount of deformation of the second rubber member 13 also increases, there is a problem that the life of the second rubber member 13 is shortened.

In both the devices shown in FIGS. 3 to 8 and the device shown in FIG. 9, if the first rubber members 6, 6A enter the gap between the punch 4 and the mold 8, After the pressurizing operation, the first rubber members 6, 6A must be completely removed, but this operation is complicated and there is a problem that the effective operating time is shortened.

Therefore, an object of the present invention is to provide a rubber pad forming press device that can press a workpiece uniformly and accurately and can extend the life of the individual parts that make up the device. .

[Means for Solving the Problems] The rubber pad forming press device of the present invention includes a punch in which the workpiece mounting portion has a first rubber member and a frame member surrounding the first rubber member. , a diaphragm disposed opposite to the workpiece mounting portion of the punch and capable of being expanded by a pressure medium; and a diaphragm attached to the outside of the diaphragm, which is in pressure contact with the workpiece on the punch and expanded together with the diaphragm. and a pressure medium supply means for supplying pressure medium into the diaphragm.

[Operations and Effects of the Invention] In the present invention, the portion of the punch on which the workpiece is placed is constituted by the first rubber member and the frame member surrounding the first rubber member. Therefore, when pressurizing, the second rubber member attached to the outside of the diaphragm comes into pressure contact with the workpiece, and the first
Even if a pressing force is applied to the first rubber member, the first rubber member will not spread laterally because the circumference of the first rubber member is restricted by the frame member. Therefore, the various problems described above caused by the lateral expansion of the first rubber member provided on the workpiece mounting portion of the punch can be solved.

That is, since the first rubber member provided on the workpiece mounting portion of the punch does not expand laterally, the workpiece placed on the first rubber member can be pressed evenly and accurately. In addition, since the lateral expansion of the first rubber member is restricted, the amount of deformation of not only the first rubber member but also the second rubber member is not large, so each rubber member is less likely to be damaged. Therefore, the life of each rubber member can be extended.

Furthermore, since the first rubber member does not enter the gap between the punch and the mold placed around the punch, it does not take time to remove the first rubber member. The effective operating time of the entire device can be extended.

[Description of Embodiments] FIG. 1 is a sectional view showing the main parts of a rubber pad forming press device according to an embodiment of the present invention. This embodiment is characterized by the punch 24 and the first rubber member 25 made of silicone rubber attached to the workpiece mounting portion of the punch 24, and the other configuration is different from the conventional device shown in FIGS. 3 and 4. Since they are similar, their explanations will be used.

As shown in a perspective view in FIG. 10, a first rubber member 25 is embedded in the workpiece mounting portion of the punch 24 so as to be surrounded by an outer peripheral upright wall 24a formed above the punch 24. It is installed in In other words, the first rubber member 25
is attached so as to be surrounded by the outer circumferential wall 24a above the punch 24 as a frame member. Therefore, the first rubber member 25
is surrounded on the sides by the outer peripheral wall 24a,
Even in a pressurized state, it does not move laterally as shown in FIG. Therefore, the first rubber member 25 does not enter the gap between the punch 24 and the mold 8. Therefore, the first rubber member 25 will not be damaged or greatly deformed by one pressurizing operation, so the life of the first rubber member 25 can be dramatically extended compared to the conventional case. is considered possible.

In addition, since the amount of deformation of the second rubber member 13 that is pressed against the first rubber member 25 and the workpiece 3 does not become large, the second rubber member 13
The lifespan of can also be extended.

Moreover, as shown in FIGS. 11 and 12,
The cross-sectional shape of the upper outer peripheral wall 24a of the punch 24 is as follows:
This is optional, and the outer peripheral edge of the first rubber member 25 may be inclined (as in the example shown in FIG. 11) or curved (as in the example in FIG. 12).
Furthermore, the width and height of this outer peripheral wall 24a are also arbitrary, and in the configuration shown in FIG.
It has been confirmed through experiments that there is no problem in terms of strength even when a pressure of 1500 Kgf/cm ² is applied when the thickness is 0.5 mm and the depth is 0.5 mm.

Note that the first rubber member 25 may be simply placed on the upper surface of the punch 24 or may be attached using an adhesive or the like. may be formed.

Further, the first rubber member 25 may be made of neoprene-based or urethane-based rubber, or may be made of any elastic member other than rubber such as foam or resin.

In the embodiment shown in FIG.
is provided so as to be embedded in the punch 24, but as shown in FIG. 13, it may be arranged so that the first rubber member 35 is surrounded by a frame member 36 that is separate from the punch 34. In this case, the frame member 36
The shape of the inner wall may be such that the corner portions are curved as shown in FIG. Also,
The frame member 36 may have an opening that accommodates the first rubber member 35, or may have a bottom wall below where the first rubber member 35 is accommodated.

Furthermore, as shown in FIG. 15, a frame member 46 consisting of frame member halves 46a and 46b which are butted together at an inclined abutting portion 47 may be used. In this case, when pressurizing, the first rubber member 45
Both frame member halves 46
This can be absorbed by moving a and 46b away from each other at the butt portion 47.

Note that in the embodiments shown in FIGS. 13 to 15, the frame member and the first rubber member may be fixedly provided on the upper surface of the punch, or may simply be placed on the upper surface of the punch. . In addition, frame member 3
6 and 46 can be made of any material harder than the first rubber member 35, for example, metal material, synthetic resin, or rubber (high hardness at 70° C. or higher). .

The present invention can be suitably used, for example, to compress and form laminated ceramic green sheets in the production of ceramic capacitors;
It should be pointed out that it can be used in general applications where uniform and flat pressing is required.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing essential parts of an embodiment of the present invention, FIG. 2 is a sectional view showing a pressurized state, and FIG. 3 is a sectional view showing an example of a conventional rubber pad forming press device. FIG. 4 is a cross-sectional view showing the pressurized state in the device shown in FIG. 3, FIG. 5 is a perspective view showing the punch and the first rubber member in the device shown in FIG. 3, and FIGS. 6 and 7 are Fig. 3 is a cross-sectional view for explaining the ideal pressurizing operation in the conventional device, Fig. 8 is a cross-sectional view for explaining the problems in the device in Fig. 3, and Fig. 9 is a cross-sectional view for explaining the ideal pressurizing operation in the conventional device. 10 is a perspective view showing the punch and the first rubber member in the embodiment shown in FIG. 1; FIGS. 11 and 12 are , sectional views for explaining a modification of the embodiment shown in FIG. 10, and FIGS. 13 to 15 are perspective views for explaining other embodiments of the present invention. In the figure, 5 is a rubber pad, 11 is oil as a pressure medium, 12 is a diaphragm, 13 is a second rubber member, 24 is a punch, 24a is an outer peripheral upright wall as a frame member, and 25 is a first rubber member. .

Claims (1)

[Scope of Claims] 1. The workpiece mounting section includes a first rubber member and a first rubber member.
a punch having a frame member surrounding a rubber member; a diaphragm disposed opposite to the workpiece mounting portion of the punch and capable of being expanded by a pressure medium; and a diaphragm attached to the outside of the diaphragm, the diaphragm Rubber pad forming comprising: a second rubber member that is pressed against a workpiece on a punch that is expanded at the same time; and pressure medium supply means for supplying a pressure medium into the diaphragm. Press equipment.