Holemaking tool with independent drill point in the center

Abstract

The invention discloses a hole processing tool with an independent drill point in the center, which includes a cutter body and a drill point. The drill point includes an inner drill point and an outer drill point which are independent of each other. The center of the drill tip forms the core of the outer drill tip, and the depth of cut of the inner drill tip is greater than that of the outer drill tip. The drill tip of the present invention is composed of an inner drill tip and an outer drill tip. The inner and outer drill tips cut into the workpiece layer by layer in the cutting depth direction. After the inner drill tip cuts into the workpiece and stabilizes, the outer drill tip cuts into the workpiece again, prolonging the time for the drill tip to cut into the workpiece. Greatly improve the stability of the drill tip drilling into the workpiece; because the inner drill tip is independent of the outer drill tip, the inner drill tip can have a small drill tip angle and the outer drill tip can have a large drill tip angle, and the inner drill tip can have a small drill tip angle. The apex angle of the drill point can prevent the cutting process of the tool from being too fast, and the chips will be excessively squeezed on the cutting edge, which improves the stability when cutting into the workpiece; the inner drill point can be interchanged in batches, and can be flexibly combined and installed on the outer drill point, which greatly reduces the cutting time of the hole drilling tool. inventory.

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° to 140°, but such a large drill tip 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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