JPS62274004A - Production of difficultly workable molding stock - Google Patents

Abstract

PURPOSE:To permit easy working of a titled stock without subjecting the same to electric discharge machining by replacing only the part of a solidified material where post-working is required with an easily machinable material at the time of manufacturing the stock by a hot hydrostatic pressurization method. CONSTITUTION:A powder material 2 is packed into a capsule 1 and is subjected to the hot hydrostatic pressurization treatment (HIP treatment) to manufacture the difficultly workable molding stock 3. The easily machinable material 4 having a required form is preliminarily disposed in the position in the capsule 1 where the stock is to be worked in a post stage. The material is then subjected to the HIP treatment after the powder packing. The material 4 which is a dummy material is held embedded as it is in the product after the HIP treatment in some cases and is removed according to need in other cases. The stock subjected to the HIP treatment in the above-mentioned manner is subjected to machining of a screw hole, etc., in the material 4 part or in the case of forming the removed hole, the material 4 of a wire or the like is removed by machining.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Field of Industrial Application) The present invention is a method for producing a molded product material, particularly a hot isostatic pressing method (hereinafter abbreviated as HIP method). When manufacturing difficult-to-machine materials such as molds, composite molded products, or Ni-based super-alloy turbine blades that require abrasion resistance, the relevant difficult-to-machine H
The present invention relates to an improved method for producing IP molded product materials.

(Conventional technology) Recently, high-performance materials with improved properties such as wear resistance, heat resistance, and corrosion resistance have been developed using powder metallurgy technology.
Among these, molds that require particularly high abrasion resistance and strength, injection molding machines and kneading machines that have improved abrasion resistance on some surfaces, and composite parts such as cylinders, such as parts with different materials on the surface or In the field of joined parts, a method of manufacturing by solidifying and molding powder using the HIP method is currently attracting attention, and research and development is progressing.

However, the more we try to improve the wear resistance in manufacturing using the HIP method, the more the screw holes become difficult to improve.

Machining of grooves and the like becomes difficult, requiring expensive tools, and in some cases, machining is not possible, forcing the user to resort to electrical discharge machining.

On the other hand, the same is true for turbine blades that require heat-resistant strength. Cooling air is circulated internally to improve usage performance, but the air holes are made of a material that is difficult to machine and is made of fine and long materials. Therefore, it is extremely difficult, and in the end, it relies on electrical discharge machining, leading to an increase in manufacturing costs.

(Problems to be Solved by the Invention) The present invention deals with the above-mentioned actual situation, and particularly solves the above-mentioned powder HIP.
In the production of difficult-to-cut materials using the HIP method, the properties required for the main parts of the parts, such as threads and grooves, are not necessarily required, but it is necessary to partially process the HIP solidified material by machining. We focused on the fact that in some cases, there are cases where it is virtually difficult to machine holes due to minute and long lengths, and we used material that is easy to machine (dummy material) only for the parts that require post-processing, such as threads. The purpose is to improve machinability without compromising the performance of the part by facilitating replacement and post-processing, and to make it possible to omit electrical discharge machining.

(Means for solving the problems) That is, the features of the method of the present invention that meet the above objectives are as shown in FIG.
As shown in FIG. 2, before filling the powder material (2) into the capsule (11) and performing HIP treatment to produce the difficult-to-process molded product material (3), the capsule (11) is prepared in advance.
The material (4) (41') that is easy to machine in the required form is placed at the position where it will be processed in the subsequent process in step 1), and is subjected to HIP treatment after being filled with powder.

Here, the material that is easy to machine and serves as the dummy material may be buried and retained in the product as it is after the HIP treatment, or may be removed as necessary.

However, in either case, it is desirable that the easily machined material does not react with the product during HIP and subsequent processing, and is also easy to disengage after removal, especially in the latter case. For example, it is preferable to use a metal material having a higher linear expansion coefficient than the product material, or an equivalent melting point higher than the product material, with ceramics, oxides, etc. firmly adhered by means such as thermal spraying. However, even materials with a small coefficient of linear expansion such as ceramic fibers can be
After processing and cooling, it is also possible to raise the temperature again and separate the fibers and base metal in a state where no stress is applied.

In addition, the form of the above-mentioned materials that are easy to machine is selected to be suitable for the intended processing, and the number of holes corresponding to the number of punch holes is selected for parts that require post-processing, such as the threaded part (5). In the case of a small cylinder (4) made of a material that is easy to machine, or a fine and long hole (5)', the diameter is the same as that of the hole, but the diameter changes due to processing in a later process. In this case, wire rods (4)' having a size that takes into account the amount of deformation are arranged in the capsule Tl) in the number of holes.

In this way, after completing the prescribed HIP treatment by the above method, the material part that is easy to machine can be machined such as by drilling holes, or if the hole is removed, the wire material etc. can be machined. By removing machining, even materials that are difficult to machine by HIP forming, which was previously considered difficult, can be processed easily without having to undergo electrical discharge machining.
Various high performance HIP molded products can be obtained.

In the above HIP process, powder filling, sealing, and hydrostatic pressurization are performed in sequence by known methods.

More specific examples will be described below.

(Example) An example of manufacturing a die for hot extrusion of non-ferrous metals as shown in FIG. 3 using the method of the present invention will be described.

In this die, the part (11) of the die body (A) that comes into contact with the extruded material becomes high temperature and requires heat-resistant strength, but the threaded part (12) that is away from the part that comes into contact with the extruded material
The temperature rise is extremely small, and no particular heat resistance strength is required.

Therefore, it was manufactured using the combination of materials shown in Table 1 below.

The method shown in Figure 1 was used for manufacturing.

Table 1 First, using the material with the above composition, as shown in Fig. 1, a screw hole was inserted into the screw hole on the bottom of the stainless steel powder filling capsule (1) corresponding to the die shown in Fig. 3. A slightly larger cylinder made of SCM415H with a diameter of 15 mm and a diameter of 13 mm (
A capsule was made by welding 4) with 8 dots. Next, the capsule (1) was filled with the A-gold alloy gas atomized powder and sealed, and heated to 1163°C x l O00kg.
/(HIPIP processing further 119 under JIX 2h conditions
Solution treatment at 0°C x 2h/8C and aging treatment at 760°C x 16h were performed.

After the treatment, the stainless steel of the filling capsule was finally removed and machined to a predetermined size.

The screw holes of the manufactured dies could be easily finished by simple machining.

(Effects of the Invention) As described above, when producing a material for a molded product that is difficult to machine using the powder HIP method, the present invention provides a material that can be easily machined in advance at a position in a powder-filled capsule that will be processed in a subsequent process. Place and fill with powder.

1 (a method of producing the molded product material by IP treatment,
Unlike the main body which is HIP molded, the parts that require processing in the post-process are made of materials that are easy to machine, resulting in wear resistance of 9.
Screw holes are used even when manufacturing products that meet strong requirements such as strength.

Machining, such as grooves and fine long holes, which was previously difficult to machine and required expensive electric discharge machining, can be easily performed by machining, and it is possible to improve the quality of products without compromising the performance of the parts. This makes it possible to manufacture high-performance material products that can be manufactured using HIPIP, significantly reducing manufacturing costs.

The method of the present invention is particularly effective when manufacturing difficult-to-cut materials such as molds, composite molded products, and Ni-based super-alloy turbine blades that require wear resistance using the powder HIP method.
It is expected that this method will be applied to the production of these products in the future.

[Brief explanation of the drawings] Fig. 1 C) ([1] is a perspective view showing an example of a capsule used in the method of the present invention and an example of its molded product material, Fig. 2 C) (+7) is a book Other embodiments of capsules used in the invention method and perspective overview views showing examples of molded product materials thereof, FIG. 3 (
b) (o) is a sectional view and a half plan view showing an extrusion die manufactured in an example of the present invention. (1) Capsule, (2) Powder material. (3) Molded product material. (4) (4) ' ...Materials that are easy to machine 3 rods in 1 day (a) (Rono (Ino 2 (b) for rods (' If (a,)

Claims (1)

[Claims] 1. When filling a powder material into a capsule and subjecting it to hot isostatic pressing to produce a molded product material that requires high performance such as wear resistance and strength, A material having a required form that is easier to machine than the powder material is placed in a position that will be processed in a subsequent process, and then filled with powder and subjected to hot isostatic pressing to form the material. A method for manufacturing a material for a molded product that is difficult to process. 2. The method for producing a material for a molded article that is difficult to machine, as set forth in claim 1, wherein the material that is easy to machine is a material that does not react with the filler powder material during hot isostatic pressing and subsequent processing. 3. A method for producing a material for a molded product that is difficult to machine, as set forth in claim 1 or 2, wherein the material that is easy to machine is embedded and held in the material for the molded product. 4. A method for manufacturing a material for a molded product that is difficult to machine, as set forth in claim 1, 2, or 3, in which a material that is easy to machine is fixed to the capsule by a fixing means such as welding, screws, or adhesive. . 5. Claims 1 or 2 in which the material that is easy to machine is removed from the molded product material after hot isostatic pressing.
A method for producing a material for a molded product that is difficult to process as described in Section 1.