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AssigneesSumitomo Electric Industries, Ltd., Matsushita Electric Industrial Co., Ltd.
InventorsMakoto Abe, Yuichiro Kohno, Nobuo Yasuhira, Shuji Ueda, Kiyoji Aburaya, Seiji Nakatani, Makoto Kawanishi
Estimating the term…
A spiral end mill which can mill a substantially sharp inside corner of a work surface and attain a stable working accuracy for a long time. The spiral end mill has a hard sintered compact insert portion, a negative relief face a first circular land provided along the outer periphery of the insert portion, and a second circular land on the negative relief face so as to be continuous with the first circular land. The widths of the two circular lands may be the same as or different from each other, and the helix angle of a back line of the second circular land is less than that of the first circular land. A method of manufacturing the spiral end mill involves machining a relief angle in the outer periphery of the insert portion while changing the helix angle between the negative relief face and the rest of the outer periphery.
A spiral end mill having a hard sintered compact being arranged on an insert portion of said spiral end mill and a negative relief face having a chamfer for reducing the angle of an axial rake being provided on a forward end of said insert portion, said spiral end mill comprising:
A spiral end mill comprising a tool body and a hard sintered compact insert bonded to said tool body, wherein said insert has a helical outer peripheral edge extending substantially along said insert, a forefront edge at a forward axial end of said insert, a negative relief face adjacent and interposed between said forefront edge and said outer peripheral edge, a first circular land having a substantially constant first width and extending adjacently along said helical outer peripheral edge, and a second circular land having a second width and extending adjacently along said negative relief face uninterrupted and continuous with said first circular land.
Dependencies are inferred from the claim text.