SU1202761A1 - Method and broaching tool for machining by deforming and cutting - Google Patents

Abstract

1, A method of deforming-cutting machining of parts, including plastic deformation of the surface layer of a part by a deforming element and subsequent elastic loading by a deforming-cutting element with simultaneous cutting of the surface layer, characterized in that, in order to increase productivity by reducing cutting forces, the surface layer is cut are in the direction of compression. (L 1HE about to vl OS FIG. I

Description

 2. Forming and cutting broaching, including deforming elements and

 cutting teeth placed between them with an equal angular pinch, characterized in that, in order to increase productivity by reducing cutting forces, the deforming elements are made as after. The invention relates to metal working and can be used for finishing and semi-finishing of internal surfaces, for example, givania

The purpose of the invention is to increase productivity by reducing cutting forces.

Figure 1 shows a deforming, broaching, general view; Fig. 2 shows a side view of the deforming-cutting broach; in fig. 3 — deforming-cutting, axonometric in FIG. 4 — a diagram of the occurrence of stresses in the workpiece during the passage of the first wedge-shaped step} in FIG. 5 — the same with the passage of the second wedge-shaped step.

The pull for the implementation of the deforming-cutting processing comprises deforming elements 1 and cutting elements 2. Deforming elements 1 have a first wedge-shaped step 3, which passes to the second wedge-shaped step 4 and a rectangular shape 5 with parallel side edges. Stage 3 is complete with a diametral excess above step 4, equal to the radial shrinkage of the hole. The cutting edge 6 of the cutting element 2 is located at the transition point of the deforming wedge-shaped step 4 to the step 5. Such elements of the deforming-cutting broach combining the deforming and cutting teeth should be arranged in pairs, each

two wedge-shaped and one rectangular steps, the first in the course of the work of the stretching step is made with a diametral excess over the second, & the cutting edges of the teeth are located at the point of transition of the second wedge-shaped step to the step of the rectangular form,

which is offset relative to the neighboring angular displacement. In this case, the cutting edges 6 of the first pair of elements cut off only the elastically loaded surface layer. All other cutting teeth 7, starting with the second pair, cut off the elastically and plastically deformed surface layer. As a variant of equalizing the condition of 9 VIY cutting for all cutting elements 2, including the first one, the deforming element 8 with a continuous or intermittent working edge, de 5 forming the surface layer, is installed first in the course of the drawing, only in places subjected to subsequent shearing. With the passage of the initial stage 3 of the deforming element 1, a longitudinal groove is formed,

20, circumferential tensile and radially compressive stresses along the bottom of the grooves occur. When the second wedge-shaped step 4 passes through the already formed grooves, the opening shrinks due to a decrease in diameter along the tops of the steps 4. At the same time, the radial stresses in the zone of the formed grooves weaken, but comprehensive squeezing occurs

30 strains on the protrusions, which at the time of a thorough reduction are cut off along the MN line.

The implementation of the initial 35 plastic deformation is necessary in order to increase the degree of subsequently generated compressive stresses.

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Compiled by I.Lihopoy Editor N.Pushnenkova Tehred Z.Kayelevich Proofreader V.Sinitska

Order 8357/14 Circulation 1085 Subscription All-Russian Institute of Scientific and Technical Information, USSR State Committee for Inventions and Discoveries 4/5, Moscow, Zh-35 113035, Moscow

Branch PPP Patent, Uzhgorod, st. Driveway 4

5

Claims (2)

1. The method of deforming and cutting processing of parts, including plastic deformation of the surface layer of the part with a deforming element and subsequent elastic loading of the deforming and cutting element with simultaneous cutting of the surface layer, characterized in that, in order to increase productivity by reducing cutting forces, cutting of the surface layer is carried out in the direction of compression. '2. D ^ forming and cutting broach, including deforming elements and cutting teeth placed between them with equal angular pitch, characterized in that, in order to increase productivity by reducing cutting forces, the deforming elements are made in the form of subsequently arranged two wedge-shaped and one rectangular steps, and the first step along the broach is made with a diametrical excess over the second, And the cutting edges of the teeth are located at the transition point of the second wedge-shaped step into the step directly golnoyformy