JPH0442715Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a press device used in a sintering furnace for new materials, and in particular to a press device that can equalize the surface pressure on the pressure-receiving surface. It is something.

[Conventional technology] Generally, when making new materials such as ceramics,
As shown in FIG. 4, a die 2 filled with a powder sample M is placed in a heating furnace 1, the sample M inside the die 2 is sandwiched between upper and lower receiving plates 3 and 4, and an upper ram 5 and a lower The sample M is pressurized by pressing the upper and lower receiving plates 3 and 4 with the ram 6, and is heated in this state to obtain a sintered product. 7 and 8 are adjustment plates.

In this case, in the conventional device, the rams 5,
6. The pressure receiving surfaces of the receiving plates 3 and 4 and the adjusting plates 7 and 8 are all formed flat.

[Problems that the invention aims to solve] However, when the surface pressure on the pressure-receiving surface was measured through an accuracy test, it was found that the surface pressure was highest from the outer periphery to slightly inside, and that damage tended to occur from the outer periphery. I understood. For this reason, it is necessary to design the product in accordance with the large surface pressure, which necessitates uneconomical selection of materials and uneconomical dimension settings.
In addition, since the pressure receiving surface is flat, the rams 5 and 6
There was also the problem that if the receiving plates 3 and 4 were misaligned, the surface pressure would further increase.

In view of the above circumstances, an object of the present invention is to provide a press device in which the surface pressure generated on the pressure-receiving surface is made equal.

[Means for Solving the Problems] The present invention provides that the pressing end surface of the pressing side of the upper and lower rams is gradually inclined in a concave direction from the outer periphery toward the center to form a concave shape, and the pressing end surface is brought into contact with the pressing end surface. It is characterized in that the surface of the receiving plate has a convex shape that matches the concave surface.

[Function] Due to the inclination of the pressing end surface of the ram and the inclination of the receiving plate,
The pressing force from the ram is transmitted to the receiving plate in a slightly inwardly biased state. Therefore, an additional surface pressure acts on the central portion where the surface pressure was relatively small, and the surface pressure is applied evenly as a whole.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment. In this embodiment, the pressing surface of the upper ram 15 is formed into a concave conical shape. Also, the receiving plate 13 that comes into contact with that surface
The surface is formed into a convex conical surface that matches the concave conical surface. Furthermore, the contact surface between the adjustment plate 17 and the receiving plate 13, and the contact surface between the adjusting plate 18 and the receiving plate 14,
The surfaces on the side of the receiving plates 13 and 14 are formed in a concave conical shape,
The surfaces on the adjustment plates 17 and 18 side are formed in a convex conical shape.

With this configuration, when the upper ram 15 is lowered and a pressing force is applied, the pressing force is applied to the receiving plate 13 in a state that is slightly biased inward.
It is transmitted to Further, the pressing force applied to the receiving plate 13 also acts on the adjusting plate 17 in a state slightly biased inward. Therefore, an additional surface pressure acts on the central portion where the surface pressure was relatively small, and the surface pressure is applied evenly as a whole. In addition, since the abutting surfaces have irregularities and these are designed to match each other, an alignment effect is achieved when the centers of the two are misaligned.

FIG. 2 shows a second embodiment. In this embodiment, the pressing surface of the upper ram 25 is formed into a concave spherical shape. In addition, the receiving plate 23 that comes into contact with that surface
The surface is formed into a convex spherical shape that matches the concave spherical surface. Furthermore, the contact surfaces between the adjustment plate 27 and the receiving plate 23 and the contact surfaces between the adjusting plate 28 and the receiving plate 24 are formed so that the surfaces facing the receiving plates 23 and 24 are concave spherical surfaces, and the adjusting plate 2
The surfaces on the 7 and 28 sides are formed in a convex spherical shape.

FIG. 3 shows a third embodiment. In this embodiment, the pressing surface of the upper ram 35 is formed into a concave surface with a trapezoidal cross section. Further, the surface of the receiving plate 33 that comes into contact with this surface is formed into a convex shape that matches the concave surface. Furthermore, the contact surface between the adjustment plate 37 and the receiving plate 33, and the contact surface between the adjusting plate 38 and the receiving plate 34,
The surfaces on the receiving plates 33 and 34 side are formed to be concave, and the surfaces on the adjusting plates 37 and 38 side are formed as convex surfaces.

[Effects of the invention] As described above, in the press device of the invention, the pressing force by the ram is transmitted to the receiving plate in a state that is slightly biased inward. Therefore,
Surface pressure comes to act extra on the center part, where surface pressure is relatively small, and the surface pressure becomes evenly applied as a whole.

This eliminates the phenomenon of damage occurring from the outer periphery, extending the life of the ram itself. This can be said to be particularly effective in hot press equipment that often uses heat-resistant and expensive graphite as the ram material. Furthermore, since damage to the ram is reduced, damage to the furnace itself is also reduced.

Furthermore, if the ram is designed in accordance with the average surface pressure, a more economical design becomes possible. Furthermore, even if the pressure receiving surface is misaligned, the misalignment is eliminated by the alignment action, and the surface pressure does not increase due to misalignment.

[Brief explanation of the drawing]

Figures 1 to 3 are the first to third figures of the present invention, respectively.
A side sectional view of the embodiment, and FIG. 4 is a side sectional view of a conventional device. 2...Dice, 6...Lower ram, 13,14,2
3, 24, 33, 34...receiving plate, 15, 25, 3
5...Upper ram, M...sample.

Claims (1)

[Scope of utility model registration request] In a press device that presses the sample by sandwiching the sample charged inside the die between upper and lower receiving plates and pressing the upper and lower receiving plates with an upper ram and a lower ram, the pressing end surface of the pressing side ram is moved from the outer periphery to the center. 1. A press device characterized in that the surface of the receiving plate is formed into a concave surface by gradually inclining in a concave direction as it goes, and the surface of the receiving plate that comes into contact with the pressing end surface is formed into a convex surface that matches the concave surface.