SU1409379A1 - Arrangement for drawing hollow articles from flat blank - Google Patents

Description

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The invention relates to the processing of metals by pressure, in particular to devices for drawing hollow articles from a flat billet,

The purpose of the invention is to increase the height of products by preventing the workpiece from thinning in a dangerous section.

On FIGO1 shows the proposed device, the overall appearance; in a longitudinal section; FIG. 2 is a diagram of the distribution of currents in inductors, ring, punch and billet; Fig. 3 is a flow chart of induced currents in the ring and punch; FIGS. A-8 are stretching stages.

The device contains a coaxially mounted matrix I of an electrically insulating material and a punch 2 of electrically conductive material, made in the form of a removable hollow split glass with an axial hole insulated on the outer side surface, the restrictive plate 3, covering the punch 2, made in the form of a flat spiral, inductor 4 mounted on the working end of the matrix 1, inside of which there is an interchangeable split ring 5 of electrically conductive material, insulated on the outer surface, and an additional Duktor 6, made in the form of a cylindrical spiral and placed inside the punch 2 in box 7.

Figs, 2 and 3 are indicated:

8 - discharge current passed through the turns of the inductors 4 and 6;

9- induced current in the split ring 5;

10 - induced current in the punch 2;

11- induced current in the workpiece. In FIGS. 1 and 2, reference numeral 12 denotes machining flat workpieces,

On Fig position 13 denotes the finished product,

The device works as follows.

When passing the discharge current 8 through the turns of the inductors 4 and 6 in the split ring 5 and in the piston 2, made in the form of a replaceable hollow split glass, currents 9 and 10 are flowing, which flow along the cut slot of the ring 5 to the inner surface , and in the split glass - on the outer surface (cylindrical and bottom). As a result, the billet 12 will induce currents 11 from the flat spiral of the inductor, the split ring and from the split glass 2, and the directions of induced currents on the billet 12 will be opposite to the currents from the corresponding elements in the resulting preform will be repelled by the split ring, and a flat spiral from the punch. Pushing away from the split ring and from the flat spiral, the flange of the workpiece 12 moves at high speed to the impact with the restrictive plate 3, and the central part of the workpiece 12, pushing away from the punch 2, takes the form of a smooth cup-shaped recess. Thus, the workpiece 12 is not in contact with the punch 2 in the deformation process and in the bottom part there is no local boundary between the deformable and non-deformable part of the workpiece 12, t, e, the entire volume of the workpiece material is involved in the deformation.

After the end of the first deformation cycle, the punch 2, together with the partially formed preform 12, is moved until its flange touches the flat working part of the inductor 4 and the split ring 5. Then the next deformation cycle is performed,

In the second and subsequent cycles, simultaneously with the flange deforming, the distribution is calibrated against the matrix 1. As soon as the central part of the workpiece 12 touches the bottom of the matrix 1, this part of the workpiece 12 will be reformed to a flat bottom. At the final stage of stretching, if the flange of the workpiece 12 is still in the zone of action of the rim cutting ring 5, the flat spiral of the inductor 4 is turned off.

The proposed device (unlike the known one) provides an increase in the height of the stretchable products by preventing the workpiece from thinning in a dangerous section.

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Claims (2)

1. DEVICE FOR EXTRACTION OF HOLLOW PRODUCTS FROM A PLANE BLANK, containing a coaxially mounted matrix of electrical insulating material and a punch of electrically conductive material, a restrictive plate covering the punch, and an inductor made in the form of a flat spiral mounted on the working end of the matrix, distinguishing '' I mean that, in order to increase the product outflow by preventing thinning of the workpiece in a dangerous section, it is equipped with an additional inductor placed in the punch, made in the form of a cylindrical spi Ali, and split ring, made of an electrically conductive material and arranged inside a flat spiral at the working end of the matrix and the punch is formed as a split nozzle with an axial hole in the bottom. 2. The device according to claim 1, characterized in that the punch and the split ring of the matrix are installed with the possibility of removal. SU., "1,409,379 of FIG. 1