High-strength unequal helical angle end mill

Abstract

The invention discloses a high-strength unequal helical angle end mill, which includes a cutting part and a handle part, the whole cutting part is provided with a plurality of chip discharge grooves helically extending from a bottom end to the handle part, a surface of each chip discharge groove towards a cutting rotation direction is a front knife face crossed with a peripheral face of the cutting part to form a peripheral blade, the helical angle of at least one peripheral blade is different from that of other peripheral blades, a face of the peripheral faces of the cutting part connected with the peripheral blade is a first rear knife face, and a face connected with the first rear knife face is a second knife face, a total length of the cutting part is Ap, the first rear knife face extends from the bottom end of the cutting part to the handle part, and the second rear knife face at least extends from the bottom end of the cutting part to a site Ap / 3 away from the handle part. The high-strength unequal helical angle end mill has the advantages of integral improvement on strength of each peripheral blade, high cutting efficiency, and long service life.

Description

technical field [0001] The invention relates to the field of metal cutting, in particular to a high-strength end mill with unequal helix angles. Background technique [0002] In recent years, in the cutting of difficult-to-machine materials (such as stainless steel 316, titanium alloy TA15), in order to improve the strength and rigidity of the tool, while ensuring chip discharge and surface quality of the workpiece, end mills with different helix angles are widely used. The unequal helix angle end mill is formed with a plurality of peripheral cutting edges twisted in a helical shape, and the helix angle of each peripheral cutting edge is different from that of the other peripheral cutting edges, so that the milling time intervals of the peripheral cutting edges in the direction of rotation of the end mill are not equal , the time interval between each peripheral edge cutting into the workpiece is also different, the included angle between each peripheral edge and the effecti...

AI Technical Summary

Problems solved by technology

[0003] However, in these end mills with unequal helix angles, since the time intervals between the peripheral edges in the rotation direction of the end mill are not equal, the time intervals for each peripheral edge to cut into the workpiece are also not equal, and the distance between the peripheral edges The included angle and the effective cutting length from the bottom cutting edge to the shank are not the same, so the thickness and deformation of the chips produced by these peripheral edges are also different, so the cutting load and chip shape on each peripheral edge also change, and immediately The strength and rigidity of the peripheral edge of the milling cutter are not equal everywhere, and there must be a weak part, especially the peripheral edge with a larger helix angle, which has a shorter effective edge length than other peripheral edges, and the strength of the peripheral edge is also higher. Worse, the cutting load on the peripheral edge is greater, so wear and breakage are more likely to occur than other peripheral edges

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