Hole-machining tool with independent drill tip in center

Abstract

The invention discloses a hole-machining tool with an independent drill tip in center. The hole-machining tool with the independent drill tip in center comprises a tool body and the drill tip, the drill tip comprises an inner drill tip and an outer drill tip which are independent from each other, the outer drill tip is arranged on the tool body, the inner drill tip is arranged at the center of theouter drill tip in a penetrating mode and is arranged on the tool body, and the cutting depth of the inner drill tip is larger than the cutting depth of the outer drill tip. The drill tip is composedof the inner drill tip and the outer drill tip, the inner drill tip and the outer drill tip sequentially cut into a workpiece in a layered mode along the cutting depth direction, the inner drill tipcuts into the workpiece stably and then the outer drill tip cuts into the workpiece, so that the time for the drill tip to cut into the workpiece is prolonged and the stability of the drill tip duringdrilling into the workpiece is greatly improved; due to the fact that the inner drill tip is independent from the outer drill tip, the inner drill tip is provided with a small drill tip angle, the outer drill tip is provided with a large drill tip angle, the tool can be prevented from drilling excessively fast in the cut-in process, so that excessive extrusion to cutting edges by cut chips can beprevented, and the stability of the tool during cutting into the workpiece is improved; and the inner drill tips can be interchanged in batches, flexibly combined and installed on the outer drill tip, so that the inventory of hole drilling tools 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 point 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. The pressure reduces the stability when cutting into the workpiece, especially when drilling on an inclined surface. In order to improve the processing accuracy, pre-drilling is generally required, and the processing efficiency is low.

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