SU865638A1 - Method of mechanical working of parts in several stages - Google Patents

Description

(54) METHOD OF MECHANICAL TREATMENT OF PARTS BY SEVERAL TRANSITIONS

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The invention relates to the technology of cold metal processing, more precisely to the processing of metal parts by surface plastic deformation.

The known method of machining parts with several transitions, in which the part at the last transition is fixed with the concave side on the table of the machine 1.

However, it is difficult to compare the resulting deflection on the second transition with the emerging deflection on the third transition, which is mainly due to the distortion of parts due to the redistribution of internal residual stresses.

The purpose of the invention is to improve the shape accuracy by reducing the amount of distortion of the part with the previous operation.

This goal is achieved by the fact that at the first transition one half of the surface of the part is rolled to the axis of symmetry with power P), and the deflection f | before knurling and deflection f after knurling, then on the second transition set the knurling force PI -.rf to roll the other half of the surface of the part with the overlapping of the surface rolled at the first transition.

FIG. 1-3 shows the transitions of machining parts.

After finishing with a blade tool, surface A is bent by fi. The part is rigidly fixed on the table of the machine. On the first transition from base B, the part is rolled up to the axis of symmetry with a span of P |. After knurling, the part is loosened and the newly formed deflection fi of surface A, measured relative to the base, is measured. This deflection is less than the previous by an amount fpi proportional to Pi

ft - f2 fp, cr,.

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Claims (1)

In order to reduce or reduce to zero the amount of deflection of 1g. On the second transition roll the other half of the surface of the part. At the same time provide the overlap of the originally rolled surface. The force of knurling P in this case is set directly proportional to the deflection fi, the effort of knurling PI and inversely proportional to the change of the deflection boom after surface plastheskNO defor 1I (5) of the first half of the debris der.,. L It follows that , twice when rolling the other half of the surface of the part, i.e., at f, 2f2, the force PZ must be equal to the initially applied Pi. The proposed method can also be used to compensate for the error in the shape of surfaces having a convex profile. For this, it is necessary to roll up the surface of the opposite (located on the reverse side) this (i.e., convex) surface. The use of the proposed method in the treatment of non-rigid parts such as plates, bases, lapping tables, slats, etc., can improve machining accuracy without removing the allowance 3 times and at the same time increase the wear resistance of surfaces. Claims The method of machining parts with several transitions, in which the part at the last transition is fixed with the concave side on the machine table, characterized in that, in order to increase the shape accuracy by reducing the amount of warping of the parts, the deflection fr of the part is determined before processing, then the transition rolls one roller half of the part surface to its axis of symmetry with a force P |, the deflection f is measured again, and on the second transition the force of knurling is selected from the condition p - 1 and the remaining hour rolls Details with overlapping surface rolled at the first transition. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 671941, cl. 23 C 3/00, 1977.