SU1454544A1 - Method of making throats - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used in mechanical engineering in the manufacture of necks by tapering with thinning. The purpose of the invention is to increase the height of flanged parts. In the process of piercing, the holes on the workpiece 3 form radial corrugations 4 with a height and width increasing towards its center. The maximum height of the corrugations 4 is determined from the expression: K or ij, 5 +. where is the radius of the flanged neck; J 5 is the current radius of the part of the billet to be taken; h - maximum height of the corrugations; n is the number of corrugations. The amount of thinning during removal is taken to be equal to the minimum thickness of the workpiece 3 S in the zone of corrugations 4. The preliminary formation of corrugations with the specified parameters eliminates tangential deformations. 1 hp f-ly, 2 ill. with (L

Description

Phage.1

11454544

The invention relates to the processing of metals by pressure and relates to methods of flanging with thinning.

The purpose of the invention is to increase the height of flanged parts by eliminating tangential deformations,

FIG. 1 shows a diagram of cutting holes and forming corrugations; FIG. 2 is a flanging circuit.

In the drawings, the following notation is accepted: 1 - matrix. For cutting, reject and forming corrugations; 2 - a container with an elastic medium; 3 - seams by the punch 6 press in the annular zone of the workpiece 3, adjacent to the hole in the gap between the punch 6 and the matrix 5, the value of which is less than the initial thickness; Sj of the workpiece 3. The size of the thinning is taken equal to the min and the minimum thickness of the workpiece 3 after corrugation in the corrugation zone 4. The three-step method, due to the introduction of an additional operation of radial corrugation, flanged part of the workpiece 3, significantly reduces the intensity

product; 4 - radial corrugations on the workpiece- | tense state. Explained

thirty

35

ke; 5 - flanging die; 6 - punch for flanging

The method is carried out as follows.

The blank 3 is cut out of the sheet metal. Then the central opening under the flanging is drawn in it and the radial corrugations 4 with the height and width increasing towards the center of the blank 3 are simultaneously formed. The maximum height h of bumps in 4 is determined from the expression. ,,

Rrcf RioTe + f n + 2F R Th &.

where is the radius of the flanged neck; R,, - Technical radius of gearing

J FROM

worn part of the workpiece;

h - maximum height of the corrugations;

ii - the number of corrugations. The radius of the KGOR flanged neck is determined by the detail drawing, the number of corrugations 4 are specified.

Due to the radial corrugation of the FLAT blank 3, the surface area increases. According to the law of preserving the volume of material before and after the process of corrugation, the thickness of the workpiece 3 decreases. The complex profile of the matrix 1 leads to an uneven distribution of deformation both in the tangential and radial directions, which in turn leads to a difference in the thickness of the workpiece. 3 both in tangential and radial directions. Moreover, if in the tangential direction the thickness of the workpiece changes cyclically, then in the radial direction it decreases in the direction to its center .;

After that, the workpiece 3 is set on the matrix 5 for flanging

45

50

This is as follows. Preliminary corrugation eliminates the formation of tangential deformations during flanging, and also causes the thickness of the corrugated section. which contributes to a significant decrease in shear deformations, i.e. the required strain rate is the sum of; two successive processes of corrugation and flanging of the workpiece 3

; i corrugation 10T.S- which allows to significantly reduce

strain rate; and, accordingly, the stresses for each of the designated processes are corrugated and flanged.

Thus, the proposed method, in comparison with the known, provides an increase in the height of the flange-shaped parts.

Claims (2)

1. A method of producing throats by cutting the center hole in the workpiece and cutting it, in order to increase the height of the resulting holes by eliminating tangential: deformations in the process of cutting the hole around the workpiece are formed on the workpiece radial heads with increasing to the center of height and width, the maximum height of the corrugation is determined from the expression Rr Gop where r four II fbi n2-iF2l R eT6 55 mountains S-oto Radius flanged g: -current radius selected vyvayem part h is the maximum height of the mountain; n is the number of corrugations. and the punch 6 presses the annular zone of the workpiece 3, adjacent to the hole in the gap between the punch 6 and the matrix 5, the value of which is less than the original thickness; Sj of the workpiece 3. The size of the thinning is taken equal to the minimum and minimum thickness of the workpiece 3 after corrugation in the corrugation zone 4. The three-step method, due to the introduction of an additional operation of radial corrugation, flanged part of the workpiece 3, significantly reduces the intensity  tense state. Explained 0 five 0 5 before 45 50 This is as follows. Pre-corrugation eliminates the formation of tangential deformations during flanging, and also causes the thickness of the corrugated section. which contributes to a significant reduction in shear deformations, i.e. deformation intensity is required; sum of; two successive processes of corrugation and flanging of the workpiece 3 ; i corrugation 10T.S- which allows to significantly reduce intensity of deformations; and, accordingly, stresses for each of the assigned processes of corrugation and flanging. Thus, the proposed method, in comparison with the known, provides an increase in the height of the flange-shaped parts. Invention Formula 1. The method of producing the necks by cutting the center of the hole in the workpiece and thinning with a thinning, characterized in that. that, in order to increase the height of the necks obtained by eliminating tangential: deformations in the process of cutting holes around it., radial corrugations with a height and width increasing to the center are formed on the workpiece, with the maximum height of the corrugations being determined from Rr Gop where r four II fbi n2-iF2l R eT6 55 mountains S-oto Radius flanged grr-slide: -current radius of the part of the billet to be taken out; h - maximum height of the corrugations; n is the number of corrugations.  . 1454544 2. The method according to claim 1, which differs from the minimum thickness of the workpiece in the zone u and in such a way that the size of the toners is. nor when flanging take equal F1 / G.2