End milling cutter with equal actual rake angles and unequal spiral angles

Abstract

The invention discloses an end milling cutter with equal actual rake angles and unequal spiral angles. The end milling cutter comprises a cutting part and a handle part, wherein the whole cutting part is provided with a plurality of chip removal grooves which spirally extend from the bottom end to the handle part; the surfaces, which face the cutting rotation direction, of the chip removal grooves are front cutter surfaces; the front cutter surfaces are intersected with the peripheral surface of the cutting part to form peripheral blades; the spiral angle beta of at least one peripheral bladeis different from that of other peripheral blades; the radial rake angle gamma of at least one peripheral blade is different from that of other peripheral blades; and the actual rake angles gamma n of the peripheral blades are equal and accord with a formula: sine gamma n is equal to the sum of sine 2beta and cosine 2beta sine gamma. The end milling cutter with equal actual rake angles and unequal spiral angles can inhibit vibration during milling and improve milling stability and the collapse-resistant and wear-resistant comprehensive properties of the peripheral blades, so that the processing efficiency of the cutter is improved, and the service life of the cutter is prolonged.

Description

technical field

[0001] The invention relates to the field of metal cutting, in particular to end mills with equal actual rake angles and unequal helix angles. Background technique

[0002] Usually, the vibration generated by the end mill during cutting will cause the surface roughness to be machined to be reduced, and the tool will wear or chip prematurely, thereby limiting the life of the tool. Therefore, in order to suppress the vibration of the end mill, it has been proposed to make the helix angle of each helical tooth different, or to make the rake angle of each helical tooth or end tooth unequal.

[0003] The U.S. patent document with the document number US20040120777A1 discloses such an end mill: the end mill body has a chip discharge flute, a cutting edge and a shank, and is formed on the outer peripheral side of a wall surface of a plurality of chip discharge flutes facing the rotation of the end mill Cutting edges, each cutting edge is not equally divided in the c...

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