Hard alloy combined screw tap

Abstract

The invention discloses a tool for machining inner hole threads, and particularly relates to a hard alloy combined screw tap which comprises a rod and a cutting portion. The cutting portion is divided into an inner layer and an outer layer, the inner layer of the cutting portion and the rod are integrally formed by the aid of steel materials, and the inner layer of the cutting portion is integrally welded with the outer layer of the cutting portion. By the aid of the structure, as the cutting portion is divided into the inner layer and the outer layer, the inner layer is made of materials with high toughness, the outer layer is made of hard alloy materials, abrasion resistance and heat resistance of a hard alloy screw tap are achieved, the toughness of a high-speed steel wire tap is exceeded, the hard alloy combined screw tap does not easily fracture and is suitable for high-speed cutting, production efficiency is improved, a large number of hard alloy materials are saved as compared with an integrated hard alloy screw tap, a lot of high-speed steel is saved as compared with the high-speed steel wire tap, and production cost is reduced.

Description

technical field [0001] The invention relates to a cutting tool for machining inner hole threads, in particular to a cemented carbide composite tap. Background technique [0002] Existing taps are roughly divided into tool steel, high-speed steel, high-speed steel powder metallurgy, solid carbide, etc. according to material classification. Among them, the performance of tool steel taps cannot be compared with the latter three. Therefore, Slightly high-end taps are made of the latter three. Compared with taps made of solid carbide, high-speed steel and high-speed steel powder metallurgy taps have higher toughness than cemented carbide, but their heat resistance And wear resistance is poor, it is not easy to cut at high speed. In addition, because the quenching hardness is not as good as that of cemented carbide, it limits its processing on some harder parts. After quenching, the hardness of the wire tooth section of high-speed steel is also Higher, which will inevitably r...

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Problems solved by technology

[0002] Existing taps are roughly divided into tool steel, high-speed steel, high-speed steel powder metallurgy, solid carbide, etc. according to material classification. Among them, the performance of tool steel taps cannot be compared with the latter three. Therefore, Slightly high-end taps are made of the latter three. Compared with taps made of solid carbide, high-speed steel and high-speed steel powder metallurgy taps have higher toughness than cemented carbide, but their heat resistance And wear resistance is poor, it is not easy to cut at high speed. In addition, because the quenching hardness is not as good as that of cemented carbide, it limits its processing on some harder parts. After quenching, the hardness of the wire tooth section of high-speed steel is also Higher, which will inevitably reduce the toughness and increase the probability of breaking. Therefore, the heat resistance and wear resistance of high-speed steel taps are not as good as those of cemented carbide, while the overall cemented carbide taps have higher wear resistance and heat resistance. It is suitable for high-speed cutting and processing of hard parts, which can significantly improve production efficiency and reduce production costs. However, cemented carbide has poor toughness and is prone to fracture. The characteristics of cemented carbide taps are reduced. Its scope in the processing field

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