Overall arc-edge step drill with function of controlling burr form

Abstract

The invention provides an overall arc-edge step drill with a function of controlling the burr form. The overall arc-edge step drill with the function of controlling the burr form comprises a drill handle and a drill bit; and the drill bit comprises a front tool face, a main rear tool face, a main cutting edge and an auxiliary cutting edge. The main rear tool face and the main cutting edge are in a step shape; and the main cutting edge is divided into three segments, namely, a front cutting edge, a transition cutting edge and a rear cutting edge. The front cutting edge and the rear cutting edge are each in an arc shape; and the transition cutting edge is in a straight line shape and is arranged between the front cutting edge and the rear cutting edge. The vertex angle of the front cutting edge at the position of a drill point is not larger than 118 degrees; the difference between the diameter of the cylindrical face where the rear cutting edge is located and the diameter of the cylindrical face where the front cutting edge is located is smaller than 5 mm; and the helical angle of the auxiliary cutting edge ranges from 35 degrees to 40 degrees. The overall arc-edge step drill with the function of controlling the burr form can effectively control production of burrs in drilling machining, the drilling quality and the drilling efficiency are both improved, and the overall arc-edge step drill with the function of controlling the burr form is simple in structure and convenient to manufacture and can be widely used in the machining field.

Description

technical field [0001] The invention belongs to the technical field of drilling, and in particular relates to an integral circular arc edge stepped drill with controllable burrs. Background technique [0002] The drill bit is used to process the connecting (fixed) holes of mechanical parts. The structure and performance of the drill bit directly affect the processing quality and efficiency of the hole. With the advancement of machining technology towards precision and high-precision machining, there are higher requirements for drilling efficiency and drilling quality. However, the current standard twist drill often produces burrs at the entrance and exit of the drill during drilling, which directly affects the quality of the hole. If necessary, a deburring process is required to complete the entire process of part hole processing. Among them, the size of the burr at the exit of the drill bit is relatively large, and the removal work is more difficult, which directly affects...

AI Technical Summary

Problems solved by technology

However, the current standard twist drill often produces burrs at the entrance and exit of the drill bit during the drilling process, which directly affects the quality of the hole. If necessary, a deburring process is required to complete the entire process of part hole processing

Among them, the size of the burr at the exit of the drill bit is relatively large, and the removal work is more difficult, which directly affects the processing quality and efficiency of the hole

The generation of drilling burrs greatly reduces the drilling efficiency and destroys the surface integrity of precision parts

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