Indexable rotating tool

Abstract

By screwing a threaded shaft (24) provided on a tip (14) into a threaded hole (26) provided on a body (12), the tip (14) is detachably installed on the body (12). Additionally, a restraining part (40) of the tip (14) is fitted into a restraining hole (38) provided in the body (12) and the body (12) and the tip (14) are positioned to be concentric with the shaft center (O). As a result, a separate installation screw is unnecessary and the tool is configured from two parts, the body (12) and the tip (14). Therefore, high centering precision is easily obtained. Additionally, the cross-sectional areas of the respective parts increase and strength increases, variation in tool life is limited, and excellent tool life can be stably obtained. Moreover, because the surface (24f) of the tip of the threaded shaft (24) is pressed to adhere closely to the bottom surface (26f) of the threaded hole (26) and the tip (14) is fixed to the body (12) to form a unit, a compressive stress acts on the threaded shaft (24) and the tip (14) can be fastened to the body (12) with a higher fastening strength than when a tensile stress is in operation.

Description

Technical field [0001] The present invention relates to an indexable rotary tool, in particular to an improvement of an indexable rotary tool in which a cutting insert is detachably mounted on the front end of a main body through a threaded connection. Background technique [0002] An indexable rotary tool is proposed. The indexable rotary tool has (a) a shaft-shaped main body and (b) a cutting blade. The cutting blade is concentrically and detachably mounted on the main body through a threaded connection. The front end portion is driven to rotate around the axis O together with the main body to perform predetermined processing. The tap described in Patent Document 1 is an example. The main body is provided with a threaded hole concentrically with the axis O, and the cutting insert is provided with a mounting hole concentrically with the axis O. The mounting screw penetrates the mounting hole of the cutting insert Screwed into the threaded hole of the main body, the cutting blad...

AI Technical Summary

Problems solved by technology

[0003] Figure 17 and Figure 18 It is a figure which shows the extrusion tap 150 as an example of such a prior art indexable rotary tool, and the cutting insert 156 is detachably mounted on the main body 152 via the mounting screw 154, and when the main body 152 and the cutting Blades 156 face each other in the axial direction on the opposing faces, respectively as Figure 18 As shown, many meshing teeth 160 and tooth grooves 162 are provided alternately and radially, and are integrally fixed so that they cannot rotate relative to each other by meshing with each other.

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