JP5965074B2 - Pressure impregnation mold - Google Patents

Description

The present invention relates to a pressure impregnation mold, and in particular, when a composite material of an impregnated substrate is produced by press impregnating an impregnated body with a melt impregnating agent, the position and orientation of the impregnated body vary. The present invention relates to a pressure impregnation mold that can suppress the occurrence of the pressure as much as possible.

In various fields including semiconductors, in order to improve the performance and durability of the entire product by combining the thermal conductivity, thermal expansion coefficient and strength with the counterpart parts, metal-ceramic, metal-carbon, resin-resin, Composite materials such as pitch-fiber have been developed. Among such methods for producing a composite material, there is a pressure impregnation method for producing a composite material by pressure-impregnating a material to be impregnated with a melt impregnating agent.

A carbon-based aluminum composite material may be used for heat dissipation of a semiconductor element or LED. Such a carbon-based aluminum composite material can be manufactured by a pressure impregnation method. Of course, in addition to this, the carbon-based aluminum composite material is used in various applications.

FIG. 1 is a view for explaining a conventional pressure impregnation mold used for producing a carbon-based aluminum composite material. A method for producing a carbon-based aluminum composite material will be described with reference to FIG. 1. After a carbon molded body or a carbon fired body having a predetermined porosity is inserted as an impregnated body 30 in a mold 10, melt impregnation is performed. A molten aluminum alloy is injected into the mold 10 as the agent 40. Further, when the inlet of the mold 10 is pushed by the pressure punch 20, the melt impregnating agent 40 is impregnated in the gap of the body 30 to be impregnated by the pressure applied by the pressure punch 20, and the composite material of the base material to be impregnated 30 is used. A carbon-based aluminum composite material is obtained.

  At this time, in the process of performing the pressure impregnation, as shown in FIG. 2, several problems occur.

First, as shown in FIG. 2A, in the process of injecting the melt impregnating agent 40 into the mold 10, a side pressure is generated in the impregnated body 30 and the impregnated body 30 is unexpectedly pushed sideways. The phenomenon occurs. Such a side pressure may be generated due to a drop impact of the melt impregnating agent 40 when the melt impregnating agent 40 is injected into the mold 10. It may occur due to the difference in the liquid level of the molten metal between the two.

  Secondly, as shown in FIG. 2B, a phenomenon in which the impregnated body 30 is unexpectedly lifted due to the buoyancy generated by the specific gravity difference between the impregnated body 30 and the melt impregnating agent 40 occurs. Such a phenomenon occurs because the molten aluminum alloy used as the melt impregnating agent 40 has a specific gravity greater than that of the carbon molded body or carbon fired body as the impregnated body 30.

  In particular, as shown in FIG. 2C, the influence of such buoyancy is conspicuous when the impregnated body 30 is surrounded by a protective film 50 in order to protect the impregnated body 30.

Before the pressure impregnation, the carbon molded body that is the object to be impregnated 30 is subjected to a preheating process in the range of about 300 to 950 ° C. The carbon molded body thus preheated is moved into the mold 10. When the carbon molded body is exposed to oxygen in the process of forming the carbon molded body, there is a problem that the carbon molded body is unexpectedly oxidized, and in addition, heat is released from the carbon molded body during the process of moving into the mold 10. Therefore, in order to solve such a problem, the impregnated body 30 is surrounded by the protective film 50. As a matter of course, the protective film 50 is formed of a material having fine through holes so that the melt impregnating agent 40 can pass therethrough.

  As described above, in the conventional case, there is a problem that the position and posture of the impregnated body 30 are changed due to the combined action of lateral pressure and buoyancy on the impregnated body 30 during pressure impregnation. In particular, since the impregnated body 30 is lifted by buoyancy, the problem is more serious in that the movement direction and posture of the impregnated body 30 are irregularly unpredictable. Since the mold 10 is made of an opaque material such as a metal, the operator hardly notices such a change in the position and posture of the impregnated body 30.

Normally, when the pressure impregnation is finished, the impregnated body 30 is taken out from the mold 10 and an unnecessary portion is cut out. As described above, the position and posture of the impregnated body 30 change during the pressure impregnation. If it is done, it will be difficult to determine what part should be cut out as an unnecessary part after the pressure impregnation process. When the part to be actually used is cut out, the production yield is lowered. On the other hand, when the part to be cut out is used as a composite material, the reliability of the product quality is lowered.

Therefore, the problem to be solved by the present invention is to prevent the object to be impregnated from being moved by side pressure or buoyancy in the process of pressure impregnation, thereby improving the production yield and producing the composite material with high accuracy. It is to provide a pressure impregnation mold that can be used.

A pressure impregnation mold according to the present invention for solving the above-mentioned problems is hollow inside to accommodate an object to be impregnated and a melt impregnation agent, and has a mold having an inlet, and is fitted into the inlet. A pressure punch provided to apply pressure to the inside of the mold, and provided in the mold to restrict the movement of the impregnated body, the impregnated body is accommodated in the interior, An empty box-like movement restricting means in which a plurality of through holes are formed on the surface of the box so that the melt impregnating agent flows toward the object to be impregnated, and the gold restricting means to restrict the movement of the movement restricting means. Fluctuation suppression means is provided so as to protrude inwardly on the inner wall of the mold .

A through hole is formed in the bottom surface of the mold, and a lower block is detachably provided on the bottom surface of the mold so as to close the through hole, and an inlet of the mold is provided on the top surface of the mold. The movement restricting means is more preferably fixed to the lower block.

A protective film is provided so as to surround the movement restricting means, and the melt impregnating agent can pass through the protective film so that the melt impregnating agent flows through the protective film and flows toward the movement restricting means. It is more preferable to have a through hole.

More preferably, the movement restricting means is formed of a material having a specific gravity greater than that of the melt impregnating agent.

More preferably, the fluctuation suppressing means is further provided so as to protrude downward from the pressure punch.

More preferably, a fixed piece is fitted into a gap between the movement restricting means and the impregnated body so that the impregnated body does not move in the movement restricting means.

According to the present invention, in the process of pressure-impregnating the material to be impregnated with the melt impregnating agent, it is possible to suppress the position and posture of the material to be impregnated from being affected by the side pressure and buoyancy, so that the production yield is improved. And it becomes possible to aim at manufacture of a composite material with sufficient precision.

FIG. 1 is a view for explaining a conventional pressure impregnation mold used for producing a carbon-based aluminum composite material. FIG. 2a is a diagram for explaining a problem of a conventional pressure impregnation mold. FIG. 2b is a diagram for explaining a problem of a conventional pressure impregnation mold. FIG. 2 c is a diagram for explaining a problem of a conventional pressure impregnation mold. FIG. 3 is a view for explaining a pressure impregnation mold according to the present invention. FIG. 4 is a view for explaining a process in which the movement restricting means 160 and the protective film 150 are provided on the impregnated body 130. FIG. 5 is a view of the impregnated body 130 stored in the movement restricting means 160 as viewed from above.

10, 110: mold 20, 120: pressure punch 115, 125: fluctuation suppression means 30, 130: impregnated body 40, 140: melt impregnating agent 50, 150: protective film 160: movement restricting means 165: fixed piece 170 : Lower block

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. The following embodiments are merely presented for understanding the contents of the present invention, and many modifications are possible within the technical idea of the present invention as long as they have ordinary knowledge in the field. You can understand that there is. Therefore, the scope of rights of the present invention should not be construed as being limited to such embodiments.

FIG. 3 is a view for explaining a pressure impregnation mold according to the present invention. Referring to FIG. 3, the mold 110 is hollow so that the object to be impregnated 130 and the melt impregnation agent 140 are accommodated, and the pressure punch 120 is fitted into the inlet. When the object to be impregnated 130 is inserted into the mold 110 and the melt impregnating agent 140 is injected, and then pressed by the pressure punch 120, the melt impregnating agent 140 permeates into the voids of the object to be impregnated 130.

As the impregnated body 130, carbon powder, carbon block, or the like can be used. At this time, the carbon block is a carbon molded body or a carbon fired body manufactured in a bulk shape using carbon powder so as to have voids. Say. As the melt impregnating agent 140, a molten aluminum, aluminum alloy, copper, copper alloy, or the like can be used.

  In such a pressure impregnation process, as described above, the melt impregnating agent 140 generates side pressure and buoyancy in the impregnated body 130 and the position and orientation of the impregnated body 130 are likely to be changed. In order to prevent this, a box-shaped movement restricting means 160 is provided and the impregnated body 130 is accommodated in the internal space.

Then, since the impregnated body 130 can only move within the movement restricting means 160 smaller than the mold 110, the positional fluctuation amount of the impregnated body 130 is considerably reduced, and the posture of the impregnated body 130 hardly changes. As shown in FIG. 5, the fixed piece 165 is fitted in the gap between the impregnated body 130, the movement restricting means 160, and the impregnated body 130 so that the impregnated body 130 does not move in the movement restricting means 160. It is preferable.

FIG. 5 is a view of the impregnated body 130 stored in the movement restricting means 160 as viewed from above. As the fixing piece 165, when the impregnated body 130 is a carbon block, it is preferable to use a graphite plate so that the impregnated body 130 is not contaminated. In the case of FIG. 5, the movement restriction means 160 is assumed to be a hexahedron. However, the movement restriction means 160 is not limited to this, and may have a cylindrical shape or other various shapes. Also good.

  When the movement restricting means 160 is provided, the movement restricting means 160 is larger than the object to be impregnated 130, so that the movement restricting means 160 is in the mold 110 compared to the conventional case where the object to be impregnated 130 moves in the mold 110. In the case of movement, the position and posture of the movement restriction means 160 do not fluctuate significantly due to spatial restrictions.

For this reason, by providing the movement restricting means 160, it is possible to greatly reduce fluctuations in the position and orientation of the impregnated body 130, which is a conventional problem. Of course, it is preferable that a plurality of through holes are formed on the surface of the box constituting the movement restricting means 160 so that the melt impregnating agent 140 flows into the impregnated body 130.

It is preferable that the movement restricting means 160 is made of a heavy material, in particular, a material having a specific gravity greater than that of the melt impregnating agent 140 so that the movement restricting means 160 does not move due to lateral pressure and buoyancy.

The protective film 150 is provided so as to surround the movement restricting means 160, and a fine through hole through which the molten impregnating agent can pass so that the melt impregnating agent 140 flows into the movement restricting means 160 through the protective film 150 is formed in the protective film 150. It is formed. FIG. 4 shows a process in which the movement restricting means 160 and the protective film 150 are provided on the impregnated body 130.

  A process of preheating the object to be impregnated 130 is performed before the pressure impregnation. For example, when the to-be-impregnated body 130 is a carbon molded body, a preheating process is performed in a temperature range of 300 to 950 ° C. At this time, if the impregnated body 130 is exposed to oxygen during the process of moving the preimpregnated body 130 into the mold 110, the impregnated body 130 is unexpectedly oxidized. In addition, in the process of moving the object to be impregnated 130 into the mold 110, a problem that heat escapes from the object to be impregnated 130 occurs. Therefore, the protective film 150 is provided to prevent this.

  Providing the protective film 150 in this manner reduces the influence of buoyancy and may cause the position and posture of the movement limiting means 160 to fluctuate due to side pressure and buoyancy even when the movement limiting means 160 is heavy. In order to prevent this, the movement restricting means 160 is preferably fixed to the mold 110. At this time, the movement restricting means 160 is preferably fixed to the lower block 170 by welding or the like.

  The lower block 170 is detachably provided in a through hole formed in the bottom surface of the mold 110 so as to face the entrance of the mold 110. The lower block 170 is for pushing up the movement restricting means 160 after the pressure impregnation process is finished, and the movement restricting means 160 is carried out of the mold 110 by such an operation.

  In order to further prevent fluctuations in the position and posture of the movement restricting means 160, it is preferable to provide fluctuation suppressing means 115, 125 projecting inwardly on the inner wall and the upper wall of the mold 110. Here, the upper wall of the mold 110 means the bottom surface of the pressure punch 120.

  As described above, according to the present invention, in the process of pressure impregnating the object to be impregnated 130 with the melt impregnating agent 140, the position and posture of the object to be impregnated 130 are changed as much as possible due to the influence of the side pressure and buoyancy. Therefore, the production yield can be improved, and the composite material can be manufactured with high accuracy.

The pressure impregnation mold of the present invention can be suitably used when producing composite materials such as metal-ceramic, metal-carbon, resin-resin, and pitch-fiber in various fields including semiconductors. Yes, this is expected to dramatically improve the production yield of composite materials.

Claims (6)

A mold that is hollow inside to contain the material to be impregnated and the melt impregnating agent and has an inlet;
A pressure punch that is fitted into the inlet and provided to apply pressure to the interior of the mold;
It is provided in the mold so that the movement of the impregnated body is restricted, the impregnated body is accommodated inside, and a plurality of the melt impregnating agent flows on the surface of the box so as to flow toward the impregnated body. An empty box-shaped movement restricting means in which through-holes are formed,
Fluctuation suppression means to project inwardly on the inner wall of the mold so that movement of the movement restriction means is restricted, and
A pressure impregnation mold characterized by comprising: A through hole is formed in the bottom surface of the mold, and a lower block is detachably provided on the bottom surface of the mold so as to close the through hole, and an inlet of the mold is provided on the top surface of the mold. The pressure impregnation die according to claim 1, wherein the movement restricting means is fixed to the lower block. A protective film is provided so as to surround the movement restricting means, and the melt impregnating agent can pass through the protective film so that the melt impregnating agent flows through the protective film and flows toward the movement restricting means. 2. The pressure impregnation mold according to claim 1, which has a through-hole. 2. The pressure impregnation mold according to claim 1, wherein the movement restricting means is made of a material having a specific gravity greater than that of the melt impregnating agent. 2. The pressure impregnation die according to claim 1, wherein the fluctuation suppressing means is further provided so as to protrude downward from the pressure punch. 2. The pressure impregnation device according to claim 1, wherein a fixed piece is fitted into a gap between the movement restricting unit and the impregnated body so that the object to be impregnated does not move in the movement restricting unit. Mold.

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