JPS61238902A - Production of joint material product composed of melting material and metallic powder - Google Patents

Abstract

PURPOSE:To produce easily a joined material product joined securely with a melting material and metallic powder at a low cost by pressurizing the green compact of the metallic powder and the melting material during sintering thereby executing simultaneously sintering and diffusion joining. CONSTITUTION:The green compact 3 consisting of the preform of the necessary shape obtd. by molding the high-speed steel powder under pressure to about 50-80% density in a metallic mold is press-welded to the prescribed position of the machined melting material 5 consisting of an alloy steel. The assembly of the above-mentioned green compact 3 and the material 5 is heated to about 1200-1300 deg.C in a vacuum and is pressurized by about 10-30g/mm<2> load exerted from an arrow P direction. The green compact 3 is thereby sintered and at the same time the diffusion joining is induced at the side face Q and base R. The green sintered body is then subjected to required machinning, by which a punching die 1 joined securely with the material 5 and the green compact 3 is obtd.

Description

[Detailed description of the invention] a. Industrial application field The present invention utilizes a preform, which is a characteristic of powder metallurgy, to produce a bonded product of metal powder and molten materials having different coefficients of thermal expansion or transformation points. The present invention relates to a method for manufacturing the same.

In this specification, the term "melted material" refers to a metal material that is generally crushed by melting, agglomeration, and expansion processing, to distinguish it from a sintered product of metal powder.

The term "preform" refers to intermediate processing such as machining performed on a green compact or preliminary sintered body before final sintering.

A green compact refers to an unsintered product made by putting powder into a mold and compressing it at room temperature.

b. Prior Art In general, in wear-resistant parts and tools, it is not necessary that the entire product or part has the required performance, and in many cases only a local part of the product or part is required to have the characteristics.

Other parts often have higher added value if they have other properties. Furthermore, since alloys that have properties for wear-resistant parts and tools are extremely expensive, it is desirable to improve the material yield, use inexpensive materials for other parts, and bond the two together. It has been adopted in some cases.

However, dissimilar materials are difficult to join, and special care must be taken in the case of high-alloy steel.

Currently used joining methods include (1) brazing method, (
2) Friction welding, flash butt welding, and (3) crimping, which mainly involves forging or rolling.

C9 Problems to be Solved by the Invention However, the brazing method 1) cannot be used in many cases where heat resistance or post-joining heat treatment is required.

In addition, in (2) @friction welding and flash butt welding, it is difficult to remove burrs during rework, and it is not suitable for thin parts.

Furthermore, with the crimping method (3), local joining is difficult;
There are significant restrictions on the shape of the product that can be obtained.

Means for Solving the d1 Problem The present invention eliminates the above-mentioned drawbacks that are unavoidable when joining dissimilar metals, and utilizes a preform, which is a feature of powder metallurgy. In other words, metal powder is pressure-molded into the required shape in a mold, the compacted powder is placed or pressed onto the required location of the molten material, and the powder is compressed and heated and sintered in a vacuum furnace. This method solves the disadvantages of the conventional bonding methods described above by obtaining a composite material in which the bonding material and the melting material are firmly bonded.

01 Effects According to the joining method of the present invention, the green compact and the molten material are sintered and simultaneously diffusion joined, and heat treatment can be performed afterwards, making it possible to join even thinner materials without causing flakes. Thus, the disadvantages of conventional bonding methods can be overcome.

EXAMPLE 1 Punching die (2) for joining by the method of the present invention will be explained below with reference to FIG.

First, for example, high-speed steel powder (SK-153) is preformed into a green compact (1) having a required shape and having a density of 75%. Next, it is crimped with machined melted material (alloy steel). At this time, the green compact should have such a thickness that it protrudes from the top surface of the melted material even after sintering is completed.

While applying a load of, for example, 20a/mm2 from the P direction in a vacuum, the bonded body of the 5KH53 powder and the melted material is
Sinter by heating to around 0°C.

This load is applied because when the green compact ■ is joined to the melted material ■ and sintered, the green compact ■ shrinks in volume as the sintering progresses, but the melted material ■ hardly shrinks, so the bonding A phenomenon of separation occurs on the surface.

On the other hand, by applying a load from the P direction, the volumetric shrinkage due to the progress of sintering does not reach the joint surface, but occurs only in the thickness direction, and diffusion occurs on both the Q and R surfaces. .

Then, after annealing, quenching, tempering, grinding and electrical discharge machining were performed to produce, for example, a punching die (2).

The cutting edge 5KH53 of the above punching die ■ is HRC6
The melted material (alloy steel) had a hardness of HRC48.

The result of the punching test for this die is 5K1-15.
The performance was better than that of the melting material 3, and no abnormalities were observed in the joints.

FIGS. 2 and 3 show a second embodiment and a third embodiment of a punch (2) in which the method of the present invention was implemented.

g0 Effects of the Invention As is clear from the detailed explanation above, according to the method for manufacturing a bonding material product of the present invention, a bonding material product of molten material and metal powder, which was previously impossible, can be easily obtained. Performance is comparable to tools made entirely of sintered products.

Therefore, it has been possible to overcome the disadvantages of conventional joining methods and to obtain a composite material product at low cost.

It is also clear that changes in the procedure, such as changing the order of steps, can be easily made without departing from the technical idea of the present invention.

[Brief explanation of drawings]

1 (Δ) and (B) are a plan view and an elevational sectional view of the first embodiment explaining the manufacturing method of the present invention, and FIGS. 2 (A) and (8
) is the same as the second embodiment, and Figures 3 (A) and (B) are the same as the third embodiment.
This is an example. (Explanation of the symbols representing the main parts of the drawing) ■... Punching die ■... Green compact ■...
Melting material P... Load direction Q... Diffusion side R... Diffusion bottom Figure 1 (A) Figure 1 (B) 5R) (') Figure 2 (A) Figure 3 (A) Procedure Neho Seisho (self-proposal) December 23, 1985 Michibu Uga, Commissioner of the Patent Office 1, Indication of the case, Patent Application No. 60-79397 2,
Name of the invention: Method for manufacturing a bonding material product between molten material and metal powder 3, Relationship to the case of the person making the amendment Patent applicant address (residence): 200 Ishida, Isehara City, Kanagawa Prefecture Name (
Name) AMADA Co., Ltd. Representative: Ten 1) Mankai 4, Agent address: 1-2-3 Toranomon, Minato-ku, Tokyo 105
Toranomon No. 5 Building 5th Floor Telephone: Tokyo (504) 3075, 3076, 3077
6. Contents of amendment (1), ``75%'' on page 4, line 6 of the specification is changed to ``50%''.
Correct to ~80%. (2) "Compressed body" and "wa" on page 4, line 9 of the specification
Insert "■" between. (3), Specification page 4, line 12 r 20(] /m
Correct m2 J to [10~30'(]/mm2 J. (4), "N 250℃" on page 4, line 13 of the specification
Correct to 200-1300℃J. (5) Correct "Die ■" on the 8th line of page 5 of the specification to "Bunch die ■".

Claims (1)

[Claims] A method for manufacturing a bonded material product, characterized in that sintering and diffusion bonding are performed simultaneously by pressurizing a compact and a melted material during sintering.