SU1276395A1 - Method of producing hollow round vessels - Google Patents

Abstract

The invention can be used in the manufacture of spherical vessels from sheet blanks by the method of stretching and subsequent crimping. The purpose of the invention is to improve quality by reducing the amount of thinning of the vascular wall. The blank is mounted on the matrix 1 and is drawn with a gap between the punch 2 and the matrix 1, defined by the following expression: Zg 1.8 + 4.0 (K-1.6) - 5, where K is the stretching ratio; S, is the thickness of the workpiece. As a result of stretching, a semi-finished product 7 with an outer diameter of 1 m in diameter and height is obtained, which is determined from the following expressions, respectively. D, 96-l, 17

Description

i

The invention relates to the processing of metals by pressure and relates to methods for making hollow ball vessels from sheet stock.

The purpose of the invention is to improve the quality by reducing the amount of thinning of the vascular wall.

Fig. 1 shows a drawing of a semifinished product (an intermediate moment is shown to the left of the symmetry axis, and the final moment is shown to the left); 2 shows the crimping scheme (to the left of the aiMMBTpHH axis is the initial position, to the right is the final V, FIG. 3 is a semi-finished product, longitudinal section; FIG. 4 is a hollow ball vessel; FIG. 5 is a graph of wall thinning versus coefficient stretching

In the drawings, the following symbols are used; Exhaust matrix 1-, exhaust punch 2, container 3, crimp semi-matrix 4, curve 5 according to the magnitude of thinning of the vessel wall: on the stretch ratio with a gap equal to 1.15 of the original thickness of the workpiece, curve 6 depending on the magnitude of the thinning of the vessel wall from the stretch ratio, prefabricated 7 in the form of a glass with a spherical bottom, a finished vessel 8.

The method is carried out as follows.

The original sheet blank (not shown) is placed on the matrix 1 and is drawn with a gap 1 "between the punch 2 and the matrix 1 defined by the following expression,

Zg 1.8 + 4.0 (K-1.6);} S, where K is the stretch ratio,

BD is the thickness of the initial billet and calibration with a gap Z to obtain semi-finished product 7 in the form of a glass with a spherical bottom with an outer diameter DC and height H, determined respectively from the following expressions,

, 96-1.17 (0.1-) 1,

 BUT

, 785 () l.

- 0, 4S,

where D is the size of the semi-finished product.,

S is the wall thickness of the finished vessel;

d is the hole diameter along the median surface of the finished vessel.

76395. 2

After that, the semi-finished product 7 is placed in a crimped spherical semi-mat: Ricu 4 and another semi-matrix 4 is shaped by crimping it, 5 resulting in a finished piece - a poland ball vessel 8 with a hole.

With conventional punching (Z, 1, 15-S) at K 1.7 wall thinning is 10 ет 20%, at K - 2 thinning reaches 55%, and at K;: f2.05, it breaks (Fig, 5, curve 5)

When stamping a semifinished product with

by the gap Z, determined by the reference) J5 dependence, wall thinning

significantly decreases (curve 6). In this case, the wall is thinned by 20% only with the stretching factor Ki 2.1, and the wall gap is not observed20 even with Kj2.22.

Going beyond the limits of Z values, οBOXpeHiuix by the given dependence, dramatically increases the wall thinning in the stamped semi-finished product,

25 The deviation of the outer diameter D and the height H of the semi-finished product 7, respectively, from the values determined by the dependences, leads either to a violation of the geometrical dimensions of the ball vessels 8, or to their rejection due to loss of stability, or the appearance of folds on the lateral surface during crimping.

The proposed method provides higher quality by reducing the size of wall thinning of the vessels being manufactured.

Claims (1)

Invention Formula A method of manufacturing hollow ball vessels from a sheet blank, including the manufacture of a semifinished product in the form of a glass with a spherical bottom by stretching the sheet blank in the gap between the punch and the die and the subsequent crimping of the semi-finished product, characterized in that, in order to improve the quality by reducing the amount of thinning of the vascular wall, the gap Z in the stretching process is established by the following expression, Zg tl, 8 + 4.0 (K-l, 6) -S, where K is the stretching ratio; SP is the thickness of the original billet, and the semi-finished product is obtained with an outer diameter D and height H, determined respectively from the following ratios. D, 96-1.17 (0.1 - f-),. J, 785 () (1) - 0, 2.4S, D is the outer diameter of the finished ball vessel; S - crowd walls of the finished ball vessel; d is the hole diameter along the median surface of the finished ball vessel. V7 ///// ////////////// 777771 cfJus.Z tpUf.S