SU1726104A2 - Method of manufacture of products - Google Patents

Abstract

The invention relates to the processing of metals by pressure and is intended to produce thin-walled pipes and parts. The purpose of the invention is to expand the range of products obtained. It is proposed to additionally distribute the billet in the zone of the inner collar in whole or in part, thus adjusting the collar height. In this case, an annular protrusion is formed on the outer surface. 5 il.

Description

The invention relates to the processing of metals by pressure, can be used in the manufacture of thin-walled body parts and pipes, and is complementary to the basic principle of the author. St. No. 1503944.

According to a known method of simultaneously forming an inner shoulder, the workpiece is distributed, wherein the angle of inclination of the generatrix of the cone of the inner shoulder is equal to a – b, where a is the angle of inclination of the generatrix of the conical part of the matrix to its axis; in - the angle of inclination of the axis of the matrix to the axis of the workpiece.

The aim of the invention is to expand the technological capabilities of the method.

This goal is achieved by the fact that after stretching with thinning and pressing, they additionally distribute by punch in the area of the inner collar.

FIG. 1-5 presents the scheme of implementation of the proposed method.

To deform the tubular billet 1 by the proposed method, a device is used consisting of a punch 2, a pusher 3, a rolling matrix 4 and a backing plate 5.

The distribution of the pipe billet 1 is carried out by the punch 2, placing a special backing plate 5 on the installation. To guide the punch through the billet during distribution, it is made with a cylindrical guide section with a diameter equal to the diameter of the billet. The rolling matrix 4 is in the installation and the circular running from the special drive (not shown) is reported to it. Simultaneously with the distribution form on the workpiece internal collar. After the inner collar has been formed, the punch 2 is raised, the backing plate 5 is removed and the punch 2 with the workpiece 1 is moved towards the rolling matrix 4 and the wall is thinned from the workpiece by stretching with thinning and then pressing.

After that, the punch 2 with the workpiece 1 is moved upwards and the plate 5 is again inserted. When the punch is moved down again, the end of the workpiece rests on the plate 5, an additional distribution of the workpiece occurs in the area of the inner collar.

As a result of additional distribution of the workpiece in the area of the inner collar on

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The outer surface of the product is formed by an annular collar. The diameter of this collar, its height dimensions and location on the workpiece are adjusted by changing the height of the inner collar, the ratio of the diameters of the working and guiding parts of the punch, as well as the punch stroke with additional distribution of the inner collar.

Removal of the stamped product from the punch 2 is carried out on the return stroke by the pusher 3.

The testing of the method was carried out on a hydraulic press with a force of 3000 kN, equipped with a special mechanism for the rolling motion of the die. Frequency of oscillatory movements is 500 obk / min. Hot-rolled tubular billets made of steel 35 were deformed. The blanks had an outer diameter of 63.6 mm, an internal diameter — 47.7 mm, a length of -300 mm. The workpiece was distributed by a punch with a guide part with a diameter of 47.5 mm and a length of 55 mm to obtain a workpiece diameter of 51 mm and the formation of a collar on the free part of the end of the workpiece with a height of 55 mm. After this, the workpiece was deformed on the punch with the rolling matrix to an outer diameter on the product of 60.5 mm. Then, the billet was distributed in the area of the inner collar to obtain an inner hole along the entire length of the billet with a diameter of 51 mm. A tubular article with a length of 405 mm was obtained with two annular outer thickenings along the edges with a length of 61 and 55 mm, respectively, with outer diameters of 66.2 and 63.1 mm. The dispensing force was “ZbO .-. ZOO kN, stamping force 200, .. 250 kN, angle of inclination of the conical inlet part of the punch 12 ° (transition from the guide to the working part), angle of inclination of the axis of the matrix to the axis of the workpiece 3 ° the angle of inclination of the generatrix of the tapered part of the matrix is 15 °, the feed is 2 mm / obk.

The efficiency of the method is achieved by expanding the range of the obtained products: it is possible to manufacture by rolling forging thin-walled tubular products with more complex outer contour (outer annular thickenings of various sizes and with different locations in height), which reduces the amount of subsequent machining, which means and metal waste.

Claims (1)

The invention The method of manufacturing products on author. St. No. 1503944, characterized in that, in order to expand the technological possibilities of the method, after stretching with thinning and pressing, the punch is additionally distributed in the area of the inner collar. / / / / / / / / / 9g.1