JPS5935937A - Composite abrasion-resisting member - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field The present invention relates to a wear-resistant composite member used for mold materials, etc., in which a thin cemented carbide member and a steel member are joined.

(b) Background of the technology Mold materials are used for dies, punches, etc. used for punching precision parts, and are processed into the desired shape by electrical discharge machining, wire cutting, etc. Mold materials are required to have high hardness, wear resistance, and impact resistance, and high-speed steel, die steel, etc. have been used, but they are insufficient in terms of hardness and life, so alternatives have been developed. Cemented carbide has come into use, but if cemented carbide is used alone as a material, it is extremely expensive and difficult to process, resulting in high processing costs and limited shapes.

For this reason, conventionally, a composite material has been used in which cemented carbide is used only in the necessary parts, steel is used in other parts, and the two are joined by brazing or the like. However, since such materials are soldered over a wide area, such as those used for molds, the difference in thermal expansion coefficient between the cemented carbide and steel can cause tensile stress to act on the cemented carbide during cooling, resulting in misalignment of the brazing. There were many problems such as cracks forming in the cemented carbide. In order to prevent this problem, the tensile stress is dispersed by dividing the cemented carbide part into several parts, but this increases the number of processing steps, which is undesirable.

(C) Disclosure of the Invention The present invention solves the above-mentioned problems with cemented carbide composite materials, and provides a composite wear-resistant member that can be manufactured without dividing the cemented carbide part, does not come off with fxR, and does not generate cracks. This is what we provide.

That is, the objective is achieved by specifying the composition and structure of the cemented carbide in a composite member in which a cemented carbide and an iron-based member are firmly joined.

The characteristics of the present invention are that the grain size of WC in the cemented carbide, which consists of a hard phase consisting of WC and other compounds, and a binding metal, is set to 0.3μ or more and 1μ or less, and that the total amount of binding metals of iron group metals is 1μ or less.
The content should be 5% by weight or more and 30% or less.

If the WC particle size is less than 0.3 μm, the sinterability of the cemented carbide is unstable and abnormal particles are likely to appear, which adversely affects chipping, which is undesirable. If the WC grain size is more than 1 μm, the cutting edge loses its sharpness, resulting in poor wear resistance.

If the bond metal content is less than 15%, the cutting edge will have no toughness, and the
If the content exceeds 2%, the strength and wear resistance of the cemented carbide will decrease. Furthermore, if the bonding metal content is less than 15%, cracks will occur in the cemented carbide due to bonding stress with iron-based members.

The iron-based member to be joined to the cemented carbide may be SCM material, die steel, high-speed steel, or iron-based sintered body.

Furthermore, the joining method is not particularly limited, but may include a driving method for Ni or Cu, an electron beam welding method, or a diffusion joining method simultaneously with infiltration with a copper-based infiltrant when joining iron-based sintered bodies. But that's fine.

After the composite member of the present invention is joined and integrated, it can be processed into a desired shape by wire cutting, electrical discharge machining, etc., and used as a mold material.It has high toughness and wear resistance, and is resistant to chipping at the cutting edge. It turned out that there were no problems and it had a long lifespan.

In conventional mold members, tensile and compressive stresses act on the cutting edge due to repeated loads, and at the same time impact force is applied, resulting in wear and chipping, which significantly shortens the mold life.However, with the product of the present invention, These problems have been resolved.

Another feature of the product of the present invention is that it can meet strict requirements in terms of processing accuracy.

B) Best Mode for Carrying Out the Invention Example 0.7μ WC powder 78%, 2μ TaC 2% and 1
A 100 x 100 x 8 mm cemented carbide plate was manufactured by mixing 20% by weight of μ Co powder and sintering after stamping. To this cemented carbide plate, a block of 5KDll x 00x100x50mx was vacuum brazed using Ni solder. A punch for punching a silicon steel plate was manufactured by wire cutting from the joined blocks, and a punching test was conducted, and the life was 20 times longer than that of die steel. Also, as a cemented carbide, 88%-12% of WC with a grain size of 2-5μ
8 compared to the punch made in the same manner as above using CO.
It showed twice the lifespan. The properties of the conventional cemented carbide and the cemented carbide of the present invention are shown in Table 1, and the alloy of the present invention has the same hardness as the conventional alloy, but has higher toughness and strong chipping resistance. I understand that there is something.

5- The thickness of the cemented carbide plate is 1/17 of the total thickness, but 1. A range of /10 to 1/3 is economical and provides sufficient performance.

(E) Industrial Applicability The product of the present invention can be applied not only to mold materials but also to wear-resistant sliding parts and structural members such as slitters, cutting blades, rollers, and guides.

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Claims (1)

[Claims] (1) In a composite member in which a cemented carbide and an iron-based alloy member are firmly joined, the grain size of WC, which is the main component of the hard phase in the cemented carbide, is 0.3μ or more and 1μ or less, and the bonding metal is Iron group metals, the total amount of which is 15% by weight or more and 80% by weight
A composite wear-resistant member characterized by: