SU730415A1 - Die for drawing hollow articles in two successive impressions at single-stroke of press slide - Google Patents

Description

The invention relates to the processing of metals by pressures, namely to dies for stretching hollow parts in two successive transitions with one stroke of the press press. A stamp is known for making hollow parts comprising radially arranged telescopically mounted punches made with radii, and clamp. The stamp allows to perform successively two exhaustive transitions in one stroke of the press slide U. crackers and pushers, as well as clamping. The closest to the technical essence of the invention is a stamp for performing sequential operations 1 out of turn in one stroke of the press ram, containing located coaxially matrix and telescopically mounted punches made with radii, and L2J clamp. The disadvantage of this device is low reliability of the punch, caused by the possibility of breakage of the latches - stopper shehh device holding the outer punch of the first transition in connection with the inner punch of the second transition. The presence of a primer complicates the design, which also reduces the reliability of the stamp. The purpose of the invention is to increase the reliability of the stamp. This goal is achieved by the fact that the matrix of the first transition is made with inlet conic along {with taper, mostly 1: 1O, and the punch of the first transition - with reverse taper, mostly 1: 5O. Fig. 1 shows a stamp, a longitudinal section; to the left of the axis of symmetry, the initial position of the stamp is shown, a reference of the intermediate stretching moment; in fig 237

- matrix of the first transition from the axis; and FIG. 3 - punch of the first transition of the stretch.

Stamp soaerl; it plate 1, the holder 2, in which the matrix 3 of the first transition, the inlet conical juice with a taper of 1: 1O, the intermediate ring 4, the matrix 5 of the second transition, the punch G of the first transition, made with reverse taper

1: 5O, inside which a second transition point 7 is installed.

 the part of the stamp mounted on the plate 1 is installed and fixed on the press table. The upper part of the stamp, mounted on the punch 7, is fixed in the press slider.

The stamp works as follows.

In the entry: conical for ske, a preform 8 is installed — a pre-elongated popufat bricat. During the downward movement, the punch 6 rests with its radius into the inner radius of the workpiece 8, thereby stopping the punch 6 on the punch 7. With a further movement of the slider press down, the first pull-out transition during which both the punch work as one piece . By further lowering the press ram, the punch 6 abuts with its outer shoulder into the matrix 3, stops and a gap is formed between the punch b and the matrix 5. Next, only the punch 7 of the second transition is lowered, which pulls the workpiece 8 from the Ttuanson 6 and draws it into the matrix 5 of the second transition.

-pass At the same time, the punch O, which has a reverse taper, performs the function of pressing, forming, in combination with its radius part, a drag edge, which eliminates folding (loss of stability) in the deformation zone. When the press ram moves upward, the stamped part is removed from the punch 7. The stamp design is simple, eliminates any element breakages, and guarantees the reliability of the stamp.

Claims (1)

1. USSR author's certificate No. 232942, cl. B 21 D 24 / GS, 1966. 2, USSR author's certificate N 60082, cl. B 21D 24 / OO, 1940 (prototype). 0U2. 1 / - "7 Fi.Z