SU1260067A1 - Die for stretching hollow billets - Google Patents

Description

The invention relates to the processing of metals by pressure, namely, the structures of sector dies for stretching hollow billets.

The aim of the invention is to increase labor productivity by reducing the working and idling strokes of the movable part of the stamp.

The drawing shows a punch diagram, a vertical section, the starting position to the left of the punch axis, to the right - the final stretching moment “

A die for stretching hollow blanks on a hydraulic universal press contains a bottom plate 1 with a groove for fixing the workpiece 2 in the lower part of the stamp. The upper half of the stamp consists of the upper plate 3 with the mandrel 4 fixed in it. In constant contact with the mandrel 4 there are sliding sectors 5, which rest on the ring 6 with their lower plane, and the upper part of the sectors is pressed by the center coil springs squeezing 7 through the flange 8, a lubricant is supplied to the surfaces of the mandrel and sectors. To precisely match the upper half of the die relative to the lower one, and for ease of adjustment, there are guide columns 9 and sleeves 10.

Dchtamp works as follows

The blank 2 is installed in the groove of the bottom plate 1. The punch 5 sectors are in a closed position under the action of the force of gravity

Compiled by I.Aynet, Dinov Editor E.Sligan Tehred M.Hodiigch

Order 5160/5 Circulation 783 Subscription

BNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Ra-tpska nab., 4/5

Manufacturing and printing company, Uzhgorod, ul. Project, 4

600672

the force of the compression springs 7, the slider of the hydraulic press starts to move down. Lowering the EU with the upper half of the stamp, the sectors 5 of the punch freely enter the cavity of the blank 2, and the direction of the column 9 enters the direction of the sleeve 10, With the further lowering of the slide, the shoulders 11 sectors of the punch place their

10 with the lower plane on the upper end of the workpiece 2 and the further lowering of the sectors is stopped, and the mandrel 4 continues downward movement together with the plate 3, extends the sectors 5 and 5 of the anson. Lowering the upper part of the stamp is performed until the upper plane of the flange 8 is in contact with the lower support plane of the plate 3,

20 The surface of the flange 8 and the surfaces d of sector 5 facing it are made conical.

During the return stroke of the press slider, the mandrel 4 with the upper plate 3 goes up, and the punch sectors 5 under the influence of the force of the springs 7 begin to converge. The final contraction of the sectors occurs under the additional effect of the conical surface of the ring 6. After that, the sectors 5 of the punch are supported on the ring b, leaving the cavity of the blank 2.

The use of the proposed invention improves labor productivity by reducing idle and working strokes of the upper part of the stamp.

Proofreader M.Sharoshi

Claims (1)

STAMP FOR STRETCHING HOLLOW Billets, comprising an upper movable and lower stationary plate, a mandrel mounted on the upper plate, a punch in the form of sliding sectors and a spring-loaded flange, characterized in that, in order to increase productivity, the sliding sectors are made with shoulders and facing each other the surfaces of the sectors and the spring-loaded flange are made conical.