Head exchangeable cutting tool holder and head exchangeable cutting tool

Abstract

This head exchangeable cutting tool holder (1) includes: a holder main body (2) and a cylindrical connection member (3), and the connection member is accommodated in a mounting hole (4) formed in the holder main body (2). ), and is made of a metal material with a hardness lower than that of the tool holder body (2). A concave portion is formed on the inner peripheral surface of the mounting hole (4), and the outer peripheral surface of the connecting member (3) is in close contact with the inner peripheral surface of the mounting hole (4) to engage with the concave portion, and the connecting member (3) is formed with a The mounting threaded portion (3E) screwed to the head side threaded portion (13) formed on the exchangeable cutting head (10).

Description

technical field [0001] The present invention relates to a head exchangeable cutting tool holder which is detachably assembled with an exchangeable cutting head having a blade to constitute a head exchangeable cutting tool, and a head exchangeable cutting tool with a cutting head mounted on the holder. tool. Background technique [0002] As a holder for such a head-exchangeable cutting tool, Patent Document 1 proposes a holder in which a steel portion is fixed to a shank portion made of cemented carbide by brazing, and the steel portion is detachably assembled. The end surface of one side of the cutting edge part (cutting head) is formed with a concave part, and an internal thread part is formed on the inside to fix the cutting edge part in the axial direction. In addition, in Patent Documents 2 and 3, it is proposed that when a cutting head made of cemented carbide is screwed to the front end of a tool holder made of steel, in order to prevent the chipping of the thread tee...

AI Technical Summary

Problems solved by technology

[0006] However, as described in Patent Document 1, in a tool holder in which a cutting head is mounted by brazing the tip of a shank formed of cemented carbide to a steel part, it is difficult to ensure the strength of the junction between these shank parts and the steel part. And there may be breakage caused by cutting resistance

[0007] In addition, since there is a steel part between the cutting head and the shank, there is a possibility of chattering and a decrease in machining accuracy due to a decrease in the rigidity of the tool as a whole, and it is not easy to separate and recycle the brazed carbide and steel after use.

On the other hand, as shown in Patent Documents 2 and 3, it is difficult to directly form threaded teeth on cemented carbide, especially if it is necessary to form threaded teeth with special shapes as described in Patent Documents 2 and 3, a large cost increase cannot be avoided. rise

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