JPH04323303A - Hip processing for long-sized body - Google Patents

Abstract

PURPOSE:To produce a long-sized body subjected to HIP processing at a high yield without warping the body by subjecting the suspended body to HIP. CONSTITUTION:A long-sized body 10 is placed in an HIP furnace 1 and subjected to HIP to produce the long-sized body. In this process, the step 10A of the body 10 is hitched to the peripheral part of a supporting hole 4 formed in the guide 3 of an HIP processing jig 2 to vertically suspend the body 10. The body is subjected to HIP processing under these conditions. Consequently, the total weight is vertically supported, the body 10 is not warped, and a long- sized body with the shape approximating that of the end product is obtained.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a method for HIPing a long object to be HIPed, and particularly to a method for HIPing a long object to be HIPed, which can prevent warpage caused by HIP processing.
This relates to a processing method.

0002

[Prior art] Conventional HIP (hot isostatic pressing)
The case of manufacturing a so-called long object using the processing method will be explained based on FIGS. 4 to 6. First, a HIP processing jig 2 is provided in a HIP processing furnace 1. The HIP process is performed under predetermined HIP conditions while the long object to be HIPed 5 is propped up in the support hole 4 of the guide 3 formed in the HIP process jig 2 to prevent it from falling down. .

The object to be HIPed 5 may be a HIP capsule 6 filled with metal or ceramic powder, or a solid cylindrical body 5A with a surface layer 5B of a different material (molten material or powder). There are some things that have been set up.

However, at high temperatures during HIP processing, the deformation resistance of the object 5 to be HIPed is small;
Due to the weight of the processing body 5, the HIP processing target 5 warps as shown in FIG. 5 (FIG. 5 shows a bimetallic body in which a surface layer 5B is provided around a solid cylindrical body 5A). .

[0005] Therefore, there is a problem in that defective products are likely to be produced, resulting in poor product yield. In addition, when manufacturing a bimetallic body from the object to be HIPed 5, FIG.
As shown in FIG. 2, since it is necessary to cut the warped portion during product processing, there is also the problem that the surface layer 5B becomes uneven in thickness, and as a result, the product cannot be manufactured.

[0006]

[Problems to be Solved by the Invention] The present invention was conceived in view of the above-mentioned problems, and it is possible to prevent warping of the object to be HIPed during HIP treatment when manufacturing a long object. An object of the present invention is to provide a method for HIPing a long object to be HIPed, which can improve the yield.

[0007]

[Means for Solving the Problems] That is, the present invention performs HIP (hot isostatic pressing) on a long object to be HIPed having a predetermined length with its length direction being in the vertical direction. A method for HIPing a long object to be HIPed, characterized in that the HIPing process is performed with the long object to be HIPed suspended. This is a processing method.

The present invention will be explained in more detail based on FIGS. 1 to 3. As shown in FIG. 1, the guide 3 is installed at a slightly higher position than before in the HIP processing jig 2,
Instead of leaning the object 5 to be HIPed on this guide 3, a step 10A is formed on the object 10 to be HIPed which corresponds to the object 5 to be HIPed, and this step 10A is connected to the peripheral edge of the support hole 4 of the guide 3. The HIP process is performed while the object 10 to be HIP process is suspended in the vertical direction by being hooked on the HIP process.

[0009] Thus, the bottom of the object 10 to be HIPed is
Since there is no contact with the internal bottom surface of the IP processing jig 2, warping is not caused by the own weight of the HIP processing object 10, but this own weight is effectively used to prevent warping. can do.

[0010] The guide 3 is a disk-shaped object that is not subjected to HIP.
It may have a simple shape with a support hole 4 into which the object to be processed 10 is inserted, but it must have sufficient mechanical strength to withstand the weight of the object to be HIPed 10 at the HIP processing temperature, and
It is necessary to attach this to the P processing jig 2 sufficiently firmly. As another example, as shown in FIG. 2, there is a configuration in which the guide 3 is placed by forming a stepped portion 2A in the HIP processing jig 2. Or as shown in Figure 3, HIP
The guide 3 may be placed directly on the upper edge of the processing jig 2.

The shape of the object 10 to be HIPed is shown in FIG.
In addition to forming the stepped portion 10A shown in , any configuration can be adopted as long as it has a shape that can be suspended by a predetermined hanging mechanism.

0012

[Operation] HIPing a long object to be HIPed according to the present invention
In the processing method, we decided to perform HIP processing with the object to be HIPed suspended, so that the weight of the long object is applied to the entire object in the vertical direction, and this weight acts in the direction of the long object to topple over. Therefore, it is possible to prevent warping due to its own weight at high temperatures where plastic deformation easily occurs during HIP processing. In this way, it is possible to reduce the number of defective products and improve yield.

[0013]

[Embodiment] Next, an embodiment of the present invention will be described. HI
The P-treated body 10 is a solid cylindrical body made of iron arranged in a stainless steel capsule, around which is filled an alloy powder having wear resistance, and the total length is 270 mm, the diameter of the main body is 16 mm, A stepped portion 10A having a diameter of 25 mm was prepared. With this object to be HIPed 10 suspended in the support hole 4 of the guide 3, normal HIP treatment was performed. H
The IP conditions were a treatment temperature of 1000 degrees Celsius, a pressure of 1000 atm, and a treatment time of 3 hours. When the product after such HIP treatment was compared with the product treated by the conventional method of placing and processing, the amount of warpage was suppressed to less than half.

[0014]

Effects of the Invention As described above, according to the present invention,
The simple process of hanging the object to be treated
Warping of the processing body can be easily prevented. Therefore, it is possible to prevent defective products, improve product yield, and manufacture processed bodies that more closely resemble the final product shape.

[0015]

[Brief explanation of drawings]

FIG. 1 is a cross-sectional explanatory diagram of an apparatus for carrying out a treatment method according to the present invention.

[Figure 2] Guide 3 for suspending the object to be HIPed 10
FIG.

[Figure 3] Guide 3 for suspending the object to be HIPed 10
It is another block diagram of.

FIG. 4 is a cross-sectional explanatory diagram of a conventional apparatus for performing HIP processing on an object to be HIPed 5. FIG.

FIG. 5 is a sectional view of the object to be HIPed 5 after HIP processing in the same embodiment.

FIG. 6 is a sectional view of the final form of the product after cutting.

[Explanation of symbols]

1 HIP processing furnace 2 Jig for HIP processing 2A Stepped part of HIP processing jig 2 3 Guide 4 Support hole 5 Object to be HIPed (long object) 6 Capsule for HIP 10 Object to be HIPed (long object) 10A Stepped portion of object to be HIPed 10

Claims (1)

[Claims] [Claim 1] A long HI having a predetermined length.
HI with the length direction of the P-treated body placed in the vertical direction.
A method for HIPing a long object to be HIPed which is subjected to P (hot isostatic pressing) treatment, the method comprising:
A method for HIPing a long object to be HIPed, characterized in that HIPing is performed with the object being suspended.