SU1479210A1 - Stepped-diameter face-milling cutter - Google Patents

Abstract

The invention relates to cutting tools and can be used in the design and manufacture of end mills for machining brittle materials. The purpose of the invention is to increase the productivity and quality of processing by providing optimal cutting conditions for finishing and roughing elements. The milling cutter contains a body, the working end surface of which is made in the form of the inner surface of a truncated cone, and cutting elements located on the side of this surface with the same angular step between themselves and divided into groups, in each of which they are arranged in a spiral, and the corresponding cutting elements of the groups are located concentric with respect to the mill axis of the circle, the distance between which decreases with increasing radii of these circles. In operation, the workpiece is placed within the minimum circumference of the cutting elements. Thus, the most protruding cutting elements — the finishing ones — are on a larger diameter, which makes them work with a higher cutting speed in relation to the draft elements, which remove a larger stock. 3 il.

Description

one

The invention relates to cutting tool designs and can be used in the design and manufacture of end mills for machining brittle materials.

The purpose of the invention is to increase the productivity and quality of processing by providing optimal cutting conditions for fine and rough cutting elements, namely, when finishing cutting elements remove a smaller allowance than the rough ones and operate at cutting speeds greater than the rough ones.

FIG. 1 shows an end mill, view from the side of the working end; in fig. 2 is a section A-A in FIG. one; in fig. 3 - processing scheme of the workpiece mill.

The milling cutter includes a housing I, the working end surface 2 of which is made in the form of the inner surface of a truncated cone, and cutting elements 3 located in the housing slots of the same depth relative to the conical surface and fixed with screws 4. The cutting elements are installed with the same angular pitch between themselves and are separated into groups, in each of which they are arranged in a spiral, and the corresponding cutting elements of the groups are located on circles concentric with respect to the mill axis, the distance between which decreases with increasing radii of these circles. Thus, the most prominent cutting elements (finishing) are located on the largest diameter, which predetermines their work with a higher cutting speed in relation to the rough ones; removing the main allowance. During operation, the workpiece is placed within the minimum circumference of the cutting elements, which ensures the formation of obtuse angles of the entrance of the cutting elements into the workpiece and exit from it, thereby preventing possible chipping of the material.

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THE JUICE

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Fig 1 A-A

FIG. 2

FIG. s

Claims (1)

Claim A hearth stepper mill comprising a body with a conical end surface and cutting elements located in the housings of the housing with the same ratio. The first conical surface of the depth, with the same angular pitch between each other and p; 13. Ti.no of the mill axis of the circles, characterized in that, in order to increase the productivity and quality of processing of brittle materials by ensuring optimal cutting conditions for fine ₅ and rough cutting elements, the end surface of the body is made in the form of an inner surface of a truncated cone, and the distance between concentric circles, on which the corresponding cutting elements of the groups are located, are made decreasing with increasing radii of these circles. Fig 1 Aa Figure 1 Fig.Z Compiled by V. Zolotov Editor M. Tsitkina Order 2479/10 Tehred I. Veres Corrector E. Lonchakova Circulation 832 Subscription VNIIIPI of the State Committee for Inventions and Discoveries under the State Committee for Science and Technology of the USSR 113035, Moscow, Zh-35, Raushskaya nab., 4.5 Production and Publishing Plant “Patent”, Uzh1 <. '!) <> D, Γ.ίι.ο ····:. ·>. G: