Fixing method of superhard tool and hard contact

Abstract

Provided are a tool wherein a super-hard tip, such as a cemented carbide tip, is fixed to a steel base, and which is suitable for use primarily for purposes such as opening a taphole; and a practical method of fixing the super-hard tip in the case of said tool. Said tool is a cemented carbide tool which is characterized in that a super-hard tip is inserted into an internally threaded tip hole formed in the steel base, and that a hold-down ring which is provided with a male thread around the external periphery thereof and is capable of being threadably engaged with said tip hole, is threadably installed in the tip hole in such a way as to be fitted over the super-hard tip, resulting in the super-hard tip being pressed and fixed. It is desirable that the external peripheral surface of the super-hard tip be formed as a conical inclined surface wherein the diameter in the upper portion (tip portion) is smaller and the diameter in the lower portion (base portion) is larger, and that the internal peripheral surface of the hold-down ring be formed as a trumpet-shaped inclined surface which closely mates with the conical inclined surface of the super-hard tip.

Description

technical field [0001] The present invention relates to a tool (hereinafter referred to as "superhard tool") that uses a contact (hereinafter referred to as "hard contact") mounted with cemented carbide such as a drill bit, an impact tool, or ceramics, etc. The fixing method of the hard contact. Background technique [0002] Hole cutting drills or surface finishing tools used in masonry are in many cases embedded with hard contacts (usually superhard contacts) in a steel matrix. As the installation method of the above-mentioned hard contact, the most common method is to drill a contact hole to fit the hard contact on the substrate, and to fit the hard contact to the contact hole and perform brazing. Or burning embedded method. [0003] However, when the object to be heated is high temperature, the tool itself that fixes the hard contact by the above-mentioned brazing or caulking method will be heated to a high temperature. Damaged or falling off such a problem. For examp...

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Problems solved by technology

[0003] However, when the object to be heated is high temperature, the tool itself that fixes the hard contact by the above-mentioned brazing or caulking method will be heated to a high temperature. Problems such as damaged or falling off

For example, the milling hole of the melting furnace is closed again at the end of the milling of the molten milling iron and moved to the next melting operation. (In order to make the front end of the mud gun for sealing (mud gun) close contact with the peripheral part of the milling hole opening, it needs to be flattened.) Since the furnace wall is at a high temperature, if the hard contact is used The drill bit after brazing or the drill bit after sintering will have the problem that the superhard contact will fall off immediately

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