JPS5819139Y2 - Hot isostatic press equipment - Google Patents

Description

[Detailed description of the invention] The present invention is an improvement of a hot isostatic press device (hereinafter abbreviated as a HIP device), and in particular, the heat insulating outer layer disposed inside a high-pressure container is prevented from thermal expansion in the high temperature state during HIP processing. This invention relates to a HIP device that is prevented from deforming.

HIP equipment is a high-pressure device that sinters various metal powders or ceramic powders densely in a high-temperature, high-pressure gas atmosphere, or eliminates the pores that exist inside cast materials or ordinary sintered bodies to produce high-strength parts. This is a widely known device, and in recent years it has been expected to be used in the metal forming field.

This device typically includes a high pressure cylinder 1, as shown in FIG.
An inverted cup-shaped heat insulating outer layer 4 and a heating device are placed inside a high pressure chamber consisting of upper and lower plugs 2 and 3 fitted into the upper and lower openings of the high pressure cylinder 1 and usually equipped with gas flow holes (not shown) The furnace chamber 5 is constructed by arranging 9 internally, respectively, and the object 1 to be processed is placed on a pedestal 10 inside the lamp chamber.
Because the furnace is maintained at a high temperature of ~2000°C, each member inside the furnace must have a structure that can withstand high temperatures, and therefore heat-resistant materials are used.

In particular, the heat insulating outer layer 4 is exposed to the above-mentioned high temperature during the HIP process, and on the other hand, it comes into contact with the outside air when the object to be processed is removed and inserted, and furthermore, due to the repeated action, it reaches the highest temperature. Although it is necessary to withstand the difference, the conventional heat-insulating outer layer 4 is generally made by concentrically polymerizing a plurality of inverted cups 6a, 6b, 6C made of heat-resistant cylinders,
It is formed by filling the spaces between each cup with heat insulating fibers made of ceramic fibers, heat-resistant glass wool, or mixed fibers of alumina and silica.

However, as mentioned above, the inverted cups 6 a , 6 b ,
If 6 C were simply superposed concentrically, the above HI
Due to repeated use due to the high temperature during P processing and the contact with outside air when the object to be processed enters and exits, subtle changes gradually occur in the material of the inverted cup itself, and this gradually enlarges with repeated use, as shown in Figure 2. At high temperatures, changes occur due to thermal expansion,
Due to its own weight, buckling occurs and eventually cracks occur.

It cannot be disputed that this causes fluctuations in the temperature distribution inside the furnace 5.
In addition to the non-uniformity of the heat insulation effect, this also affects the processing mode of the object to be processed.

The present invention deals with and avoids the above-mentioned phenomenon of HIP equipment, and the above-mentioned heat-insulating outer layer is divided vertically into two or more parts at least at the lower part of the innermost layer side, and the above-mentioned heat-insulating outer layer It is characterized by a structure designed to absorb the thermal expansion of.

Hereinafter, specific embodiments of the present invention will be further described based on the accompanying drawings.

First, the overall structure of the HIP device of the present invention is shown in FIG. 1, and consists of a high-pressure cylinder 1, upper and lower plugs 2.3, and a heat-insulating outer layer 4.3 inside. The configuration in which the heating device 9 is built-in is the same as that described above, so the details will be omitted.

Therefore, the heat insulating outer layer 4 portion in the above structure is a main part of the present invention, and is placed in the high pressure chamber surrounding the object to be processed 11 on the pedestal 10 loaded inside. is a plurality of materials with different diameters, such as heat-resistant SUS, M
Heat-resistant inverted cup 6 made of Inconel for O alloy and In alloy
a, 6b, 6C, and the above-mentioned heat insulating material 7a7b filled between each cup.

Of course, the number of inverted cups to be polymerized is appropriately selected depending on the relationship between the furnace chamber 5 and the high pressure chamber, and it goes without saying that it is not limited to the above three-layer configuration.

A feature of the present invention is that the heat-resistant inverted cup of the heat insulating outer layer 4 of the HIP device as described above is divided into a middle portion.

3 to 5 show the divided structure of the heat-resistant inverted cup, which is a feature of the present invention, but when the heat-resistant inverted cup to be divided is inside, middle, and outside, it is not necessary to apply it to all of them. at least the innermost inverted cup 6
It is sufficient to divide C into upper and lower parts at a relatively lower part.

This is because, although it goes without saying that the temperature inside the HIP processing furnace is usually maintained at a substantially uniform temperature, it is natural that the inside of the furnace chamber 5 will be at the highest temperature due to the location of the heating device 9. Therefore, the innermost inverted cup 6C is exposed to the highest temperature.

However, this innermost inverted cup 6C is the part that comes into contact with the outside air when the object to be processed 11 is taken in and taken out, and is the cup most likely to be deteriorated.

However, this does not negate the application of a similar divided structure to all the inverted cups 6a, 6b, and 6C.

In addition, when dividing, the illustrated example shows the case of vertical division, and in fact, such a case is the most common,
If more division is preferable based on the function of absorbing thermal expansion, it can be divided accordingly.

In addition, as for the specific structure of the divided parts 8, in FIG. 3, the divided parts 8 are partially cut out and are configured to fit and cover each other, and in FIG. 4, the bottom of the upper cup, and The top of the lower cup is sealed with heat insulating plates 8a and 8b.

Further, in the example shown in FIG. 5, it is formed in a cut state.

In any of these cases, when the heat-resistant cup thermally expands under high-temperature conditions, if it is one piece, the internal stress cannot escape and deformation becomes unavoidable. Prevents deformation by absorbing misalignment.

Therefore, in addition to the above-mentioned divided part structure, the present invention includes all structures that are compatible with the above-mentioned purpose and capable of absorbing thermal expansion.

Therefore, one method is to use a material that can absorb thermal expansion at high temperatures.

Thus, with the tilt-up configuration, even if the object to be processed 11 is loaded into the furnace chamber 5 and subjected to HIP processing, and even if it is taken out from the furnace chamber 5 after processing, it will not be exposed to at least the highest temperature. The innermost heat-resistant cup, which is affected by temperature differences, has a thermal expansion absorption function at the split part, which prevents deformation and eliminates the buckling phenomenon that previously occurred with inverted cups, resulting in stable insulation. HIP processing can be performed under the outer layer.

As described above, in the present invention, the heat-resistant inverted cup constituting the heat-insulating outer layer of the HIP apparatus is configured to absorb thermal expansion at least at the innermost side thereof, so even if the inside of the HIP processing furnace is maintained at a high temperature state. The heat-resistant cup does not deform, so it can be HIPed under a stable high temperature and high pressure atmosphere.
As a result, the deformation caused by the thermal expansion is prevented, thereby extending the service life of the heat-resistant cup.
It has a remarkable effect of reducing the number of replacements of the insulation outer layer, increasing the safety and stability of equipment use, and also prevents damage to the heat-resistant cup, reducing the deterioration of insulation fibers and the wear-off of fibers. It also maintains the temperature inside the furnace stably and economically over a long period of time, eliminates wasted heat inside the furnace, and contributes to energy conservation.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing the basic configuration of the HIP device, Fig. 2 is an enlarged view of part A in Fig. 1 showing the state of the conventional heat insulating outer layer at high temperatures, and Figs. 3 to 5 are all based on the invention. FIG. 3 is an enlarged view showing each example of the structure of the heat insulating outer layer of FIG. 4...Insulating outer layer, 5...High temperature furnace chamber, 6
a, 6b, 6C...Heat-resistant inverted cup, 7 a
, 7 b... Insulation material, 8... Division part,
8 a, 8 b...Insulation board.

Claims (1)

[Scope of utility model registration request] 1. In a hot isostatic press apparatus having a high-temperature furnace chamber 5 surrounded by an inverted cup-shaped heat insulating outer layer 4 in a high-pressure container, at least the inner layer side of the heat insulating outer layer 4 is divided at its lower part into two or more upper and lower parts. A hot isostatic press device characterized in that the divided portion 8 absorbs thermal expansion of the heat insulating outer layer. 2. The heat-insulating outer layer 4 includes a plurality of heat-resistant inverted cups 6a, 6b,
The hot isostatic press apparatus according to claim 1, which is formed by polymerizing 6C and filling insulating materials 7a and 7b between the cups. 3. The hot isostatic press apparatus according to claim 1 or 2, wherein at least the top portion of the lower member in the heat insulating outer layer divided portion 8 is sealed by heat insulating plates 8 a and 8 b. 4. The hot isostatic press apparatus according to claim 2, wherein the outermost heat-resistant inverted cup 6a is integrated into an upper and lower part without being divided into upper and lower parts.