Hole machining tool with independent drill tip in center

Abstract

The invention discloses a hole machining tool with an independent drill tip in the center. The hole machining tool comprises a tool body and the drill tip. The drill tip comprises an inner drill tip body and an outer drill tip body independent of each other. The outer drill tip body is arranged on the tool body. The inner drill tip body is mounted in the center of the outer drill tip body to forma core of the outer drill tip body. The cutting depth of the inner drill tip body is larger than that of the outer drill tip body. The drill tip is composed of the inner drill tip body and the outer drill tip body, the inner drill tip body is cut into a workpiece successively in a layered manner in the cutting depth direction, after the inner drill tip body is cut into the workpiece stably, the outer drill tip body is cut into the workpiece, the time that the drill tip is cut into the workpiece is prolonged, and the stability that the drill tip is drilled in the workpiece is greatly improved;due to the fact that the inner drill tip body is independent relative to the outer drill tip body, the inner drill tip body can have a small drill tip vertex angle, the outer drill tip body can have alarge drill tip vertex angle, the situation that the tool cut-in process is too fast and consequently a cutting edge is excessively extruded by cutting scraps can be avoided by means of the small drill tip vertex angle of the inner drill tip body, and stability generated when the drill tip is cut into the workpiece is improved; and the inner drill tip body can be mounted on the outer drill tip body in a batched interchanging manner and a flexible combination manner, and the inventory of the hole drilling tool is greatly reduced.

Description

technical field [0001] The invention relates to a metal cutting tool, in particular to a hole processing tool with an independent drill point in the center. Background technique [0002] When the drilling tool is cutting, the cutting end is mainly subjected to the cutting force, and the chips can only be discharged from the cutting end through the chip groove. Since the cutting speed of the drilling tool varies greatly, and the center cutting speed is zero, the drilling During processing, especially during drilling into the workpiece, most of the axial cutting force is borne by the central cutting edge of the drilling tool. Drill points with small apex angles have strong centering ability but high cutting force and poor strength when drilling. Drill points with large apex angles have poor centering ability but small cutting load when drilling. In order to ensure drilling accuracy and cutting efficiency. In order to reduce the cutting force and improve the efficiency of the ...

AI Technical Summary

Problems solved by technology

The drill point with a small apex angle has strong centering ability when drilling, but the cutting force is large and the strength is poor. The centering ability of the drill point with a large apex angle is poor when drilling, but the cutting load is small.

In order to reduce the cutting force and improve the efficiency of the tool, the drill tip angle of the drilling tool is generally 120°~140°, but such a large drill point angle will cause the cutting process of the drilling tool to be too fast, and the chips will be excessively squeezed on the cutting edge. Reduce the stability when cutting into the workpiece, especially when drilling on inclined surfaces, in order to improve the machining accuracy, pre-drilling is generally required, and the machining efficiency is low

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