A head-exchangeable rotary cutter

Abstract

The invention discloses a head exchangeable rotary cutter, which comprises a cutter head part and a cutter bar part; one end of the cutter head part is provided with a cutting part, and the other end is provided with an external thread connection part; the cutter bar part One end of one end is provided with an internally threaded connecting portion and matches with the externally threaded connecting portion of the cutter head component; in the externally threaded connecting portion of the cutter head component, along the axial direction of the externally threaded connecting portion, the thread is larger The diameter remains unchanged, the small diameter of the thread changes in a taper, and gradually decreases from the inside to the outside, the distance between the crests of the same side of adjacent thread teeth is equal, and the width of the crests of each thread is the same; the cutter head In the externally threaded connection portion of the component, the distance between the roots of adjacent screw teeth changes in a certain manner along the axial direction of the externally threaded connection portion. The invention can ensure that the thread pretightening force of the cutter head part is large enough to increase the strength of the interface between the cutter head part and the cutter bar part, realize stable processing, and realize precise positioning of the cutter.

Description

technical field [0001] The invention relates to the technical field of cutters, in particular to a head-exchangeable rotary cutter. Background technique [0002] In order to improve the economy of the tool, head-exchangeable rotary tools are widely used. One of the main features of this type of tool is that the head part (the part containing the cutting edge) and the shank part (the part containing the shank) are independent , that is, the cutter head part and the tool bar part are two independent parts that can be disassembled. When in use, the cutter head part and the tool bar part are assembled together to form an integral rotary tool for cutting. , after the cutting edge processing of the cutter head parts reaches the scrap standard, the cutter head parts (that is, the cutting edge) can be replaced, and the tool bar parts (ie, the handle) can be used repeatedly, so that the tool bar parts can also be used economically. It can be processed and manufactured with more dura...

AI Technical Summary

Problems solved by technology

[0003] 1. The root of the standard straight thread is prone to stress concentration, which can easily lead to deformation or even breakage of the thread root, reducing the strength of the tool thread interface, which will have a great impact on safe processing and tool life;

[0004] 2. Increasing the diameter of the thread core will lead to insufficient pre-tightening force of the threaded interface and a decrease in connection strength, which will bring safety hazards to actual processing and production

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