SU1282988A1 - Mill for working keyways - Google Patents

Abstract

The invention relates to the field of metal cutting and can be used in the processing of key grooves on the details of rotation. The aim of the invention is to expand the technological capabilities of the mills when machining the grooves on the bodies of the wormheads. The milling cutter for machining keyways contains a shank 1 and a working part with helical main shears, with their edges 2 located on a truncated conical surface 3 having an inclination angle p. At the end 4, there is a conic surface on which the auxiliary straight cutting edges 5 are spaced, while the angles between the generatrix of the truncated conical surface and the axis of the cutter, as well as between the generatrix of the conic surface and the base are equal. 6 Il.

Description

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The invention relates to metal cutting and can be used in the processing of key, slotted and similar grooves.

The purpose of the invention is to expand the technological capabilities of the mills when machining keyed slots on the turning bodies by changing the geometry of the cutters and their edges.

FIG. 1 shows a milling cutter for machining longitudinal grooves; in fig. 2 is a section A-A in FIG. one; in fig. 3 is a section BB in FIG. I; in fig. 4 shows a section B-B in FIG. one; in fig. 5 is a view of FIG. one; in fig. 6 is a groove processing circuit.

The milling cutter for machining keyways comprises a shank 1 and a working part with helical main rezush, their edges 2, located on a conical surface 3 having an angle of inclination p. At the end 4, there is a conic surface on which the auxiliary straight cutting edges 5 are located, which are also inclined at an angle P with respect to the plane perpendicular to the axis of the cutter and form a right angle with the main cutting edges.

To process the longitudinal groove in a Vrash body type part, such as a turning center with three coordinates X, Z to C, two transverse drills are made at the ends of the keyway to exit the cutter. Further, these drillings are connected by reciprocating movements of the cutter by successively machining the left and right sides of the groove with a corresponding rotation of the workpiece left and right along the coordinate C by the total angle p to each side. Angle p is determined from the ratios

/ I / j

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p arcsin (a4-p) -arcsina; sin (a + P) 4; since;

-V (t) 4 (i-ov

e D is the diameter of the workpiece; b-width of the groove; t is the depth of the groove;

R is the radius passing through the apex of the angle formed by the base and side wall of the groove;

a is the angle between the mill axis and the radius passing through the center of the workpiece and the point of intersection of the main and auxiliary cutting edges; d is the diameter of the common base.

Claims (1)

Invention Formula A milling cutter for machining keyways, comprising a shank and a working part with main cutting edges located on a truncated conical surface with a smaller base at the shank and auxiliary cutting edges located at the end of the milling cutter, characterized in that its end face has a conic surface having a common base with a truncated conical surface, with auxiliary cutting edges located on the conical surface, and the angles between forming a truncated conical surface and the axis of the cutter, as well as between the generatrix of the conical surface and the base are equal. 7 dl / gL (puff. 5 dzig.6