Patent ID: 9346109
Filing Date: 2016-05-24
CPC Classification: B23C,Y10T

Claim Text:
1. An unequal helix-angle end mill comprising a cutting part and a handle part, wherein said cutting part has a column shape and defines an outer peripheral face, wherein said entire cutting part is provided with a plurality of flutes which have different pitches along a circumferential direction, wherein each of said flutes spirally extends from a bottom end of said cutting part to said handle part, wherein a face of each flute facing a cutting rotation direction is a rake face, wherein said rake face and said outer peripheral face of said cutting part are intersected to form an outer peripheral blade, wherein a helix-angle of at least one of said peripheral blades is different from those of the other peripheral blades, wherein a face joined with said peripheral blade among said outer peripheral face of said cutting part is a rear face, wherein the width B of an edge flap of each of said peripheral blades is equal on a plane orthogonal to a rotating axis of said end mill, wherein the width B of said edge flap of each of said peripheral blades is constant along an axial direction of said end mill, so that a strength of each peripheral blade is substantially constant along said axial direction of said end mill to further enhance an equability of the strength of said peripheral blades, avoid an existence of several weak sites on said peripheral blades on a predetermined sectional plane orthogonal to said rotating axis, prevent relatively fast abrasion which takes place in a part of said end mill that results in a decrease of a durability of said end mill, and further enhance a performance of said end mill in a process of roughing feed and deep sawing.