RU1810177C - Method of manufacture of thin-walled cylindrical reservoirs - Google Patents

Abstract

Usage: in the manufacture of reservoirs of automobile shock absorbers. SUMMARY OF THE INVENTION A multi-step retraction is carried out with an intermediate thermochemical treatment. During the last stretch, the upper part of the semifinished product wall is thickened on the inner side of the cylindrical surface with a conical transition to the inner wall surface equal to 12. ,, 15 °, and then during the removal of the semifinished product from the punch due to the interaction of the inner thickening of the semifinished product with the punch by reverse movement, the thickening is distilled from the inner surface of the semifinished product to its outer. 8 ill.

Description

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The invention relates to methods for manufacturing thin-walled cylindrical tanks, in particular to methods for manufacturing tanks of automobile shock absorbers for cars and trucks, and may find application in the manufacture of tanks for any field of technology.

The aim of the invention is to improve the quality of products by providing a smooth increase in deformation during the reforming of the thickening.

In FIG. 1 shows the operation of punching a mug and thermochemical treatment; in FIG. 2 - hoods; in FIG. 3 - landings with thermochemical treatment, in FIG. 4 - first drawing with thinning and thermochemical treatment; FIG. 5 - second hood with thinning and trimming: in Fig.6 - the beginning

a second hood with thinning upon receipt of a thickening for the thread; in FIG. 7 - end of the second drawing with thinning upon receipt of a thickening for the thread; in FIG. 8 - start of removal and driving of the bulge from the inner surface to the outer surface.

The proposed method for manufacturing cylindrical thin-walled tanks of automobile shock absorbers is implemented as follows.

The manufacture of a pilot batch of shock absorber tanks was carried out for passenger cars.

They take the initial billet from 11YuA steel in the form of a card 10 mm thick and cut a circle with a diameter of 81 mm into the Toledo press with a force of 630 ton-force. The cut-out circle is degreased and subjected to recrystallization annealing and phosphated with

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about

4 xi

by saponification (Fig. 1), the resulting circle is then pulled on a Poltha press with a force of 400 tf with a pusher through two matrices with a total degree of deformation of 65..70% are rolled into a cap (Fig. 2). the degree of deformation is taken by the matrix 55 ... 60%, and on the bottom - 30 ... 35%.

The rolled cap to obtain the bottom thickness specified by the drawing by cold deformation between the die-die is subjected to bottom sedimentation to a thickness of 3 ± 0.2 mm on a K0036 press with a force of .400, tf (Fig. 3). After sedimentation of the bottom, the resulting semi-finished product is subjected to successively two extracts with thinning with intermediate recrystallization annealing, phosphating and saponification. In this case, the first, after settling the bottom, the hood with the thinning of the semi-finished product is drawn through two matrices with a total degree of deformation of 54,., 56%, including 34., .36% on the upper matrix, and 27 ... 30% on the lower matrix (Fig. 4). The final drawing with thinning (second) is conducted through one matrix with a degree of deformation of 30 ... 35% (Fig. 5).

In the process of this drawing, a thickening is formed in the upper part of the body of the obtained reservoir under thread cutting. This thickening is obtained by pulling the semi-finished product through one die with a punch having an inner cylindrical ledge with a transition into a cone equal to 12 ... 15 ° to the outer diameter (see Fig. 6,7,8).

During the working stroke of the punch on the semifinished product, the specified amount of thickening is obtained on its inner surface (see Fig. 7), and during the reverse stroke of the punch during the removal of the semifinished product from the punch (the semifinished product is butt end facing the puller) due to the interaction of the internal thickening of the semifinished product with the shoulder of the punch, the latter is distilled from the inside

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5

0

5

0

5

0

surface to the outside (see. 8). and the semifinished product is removed from the punch. After that, the upper part of the semi-finished product is cut to size according to the drawing, and on the resulting thickening, a thread is cut.

Using the proposed method for manufacturing thin-walled cylindrical tanks provides the following advantages in comparison with the prototype. Due to the fact that in the proposed method there are no two hoods without thinning, as well as an instant increase in deformations during the process of reforming the thickening from the inner surface of the housing to its outer as compared to the prototype, it is more efficient and its use will increase the quality of the resulting buildings with a simultaneous increase in the volume of their production.

In addition, its use will make it possible to abandon foreign technologies and stop the purchase of high-precision pipes for foreign currency.

Claims (1)

The claims A method of manufacturing thin-walled cylindrical tanks, including multi-junction drawing with thermochemical processing between the transitions, forming a thickening. At the last junction of the drawing from the inner side of the open end face of the semifinished product, reshaping of the obtained thickening to the outer surface during the removal of the semifinished product from the punch and the end segment, different from the fact that, in order to improve the quality of products such as automobile shock absorbers by ensuring a smooth increase in deformations during reformation thicker and thickening is carried out with a conical transition section to the side of the inner wall of the semifinished product with a cone angle equal to 12-15 °.