Extrusion die and cutting tool for machining such a die

Details Extrusion die and cutting tool for machining such a die Extrusion die and cutting tool for machining such a die

1975-11-04

1977-05-03

Hinson, Harrison L.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having axial, core-receiving central portion

29103R, B23B 4102, B26D 112

Patent

active

040211347

ABSTRACT:
The invention provides a hollow mill cutting tool capable of forming a cylindrical pin on one face of a plate member by removing material from the plate member. The cutting tool comprises a generally cylindrical member terminating in a tip portion having a toroidal cross-section and having its axis aligned with the cylindrical member. The inside diameter of the protruding end of the tip portion is selected to be the desired diameter of the cylindrical pin. The tip portion includes a plurality of forward helical surfaces each terminating at a forward end in a cutting edge extending across the thickness of the toroidal cross-section. Each helical surface extends rearwardly along a cylindrical path from the cutting edge at an angle of about 8.degree.-11.degree. with a plane transverse of the axis of the cylindrical member. A back helical surface, which is inclined at an angle of at least 55.degree. to a plane parallel to the axis, is connected to each of the foward helical surfaces. A generally longitudinally-extending surface is connected at one end to the forward end of one of the forward helical surfaces to form a cutting edge, and the other end of each longitudinally-extending surface is connected to the rear end of an adjacent back helical surface.

REFERENCES:
patent: 2062257 (1936-11-01), Douglas et al.
patent: 3227013 (1966-01-01), Zimmermann
patent: 3308689 (1967-03-01), MacDonald
patent: 3351998 (1967-11-01), Theiler
patent: 3387637 (1968-06-01), Ferguson et al.
patent: 3609056 (1971-09-01), Hougen

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