SU1186325A1 - Method of producing flanged hollow articles - Google Patents

Abstract

A METHOD OF MANUFACTURING HOLLOW FLANGED DETAILS, in which the central part of the flat blank is stretched and the flange part is deposited in thickness, characterized in that in order to reduce energy consumption, the flange portion of the blank is deposited sequentially along the ring sections in the direction from the symmetry axis to the periphery , the non-planted flange parts are subjected to a force preventing the outflow of material to the periphery of the workpiece, and then the upset parts are affected by the force preventing folding. e.

Description

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The invention relates to the processing of metals by pressure and relates to methods for the manufacture of hollow parts with a flange.

The purpose of the invention is to reduce energy consumption.

FIG. 1 shows the workpiece before stretching, the initial position; in fig. 2 - the initial stage of shaping under the action of the force of punching RS; .. FIG. 3 - position after precipitation of the material in the annular area 1; in fig. 4 - the same, in the ring area 2; on fi. 5 - the same, in a ring site 3; in fig. 6 - the same, in a ring site 4.

The method is carried out as follows.

A billet with a thickness of So is installed in the die (Fig. 1) and fixed thereon along a cylindrical surface with a diameter Ots, after which the billet is pressed (Fig. 2) (between the clamp and the die) and its central part is loaded with a Put force of 0.85- 0.90 Rrar (where Rrar is the resolving power), i.e., Psh (0.85-0.90) Pp4b (0.85- -90) fDrSo BB due to the fact that the width of the flange is large (stretch ratio Ko 2.0) and its thickness S is greater than the wall thickness of the product S (), the force Psh. Is not able to provide a stretch with plastic deformation of the flange of the workpiece. However, the latter can be achieved by loading the ring section No. 1 (bounded by cylindrical surfaces with a diameter of DN .. and DI) .. by force of precipitation Pot..i simultaneously with loading of the ring sections 2-4 by forces of Rig-Ria and Ry4, which exclude the expiration of the material in the last of the upset section 1. In this case, the outflow of the deposited material from the area 1 into the exhaust gap between the punch and the die, defined by cylindrical surfaces of diameter DII and DM, is ensured. After the initial thickness of the workpiece SQ is deposited to the thickness S (Fig. 3) to produce a cylindrical part of the product with height h, the draft of the material in section 1 is stopped and a corresponding redistribution of forces in the flange of the workpiece is ensured for the next stretching stage. For

In order to provide a draft in the annular region 2 (bounded by cylindrical surfaces with a diameter of D i D), it is necessary in the annular region 1, which has

settling, to create a force Pj, which prevents the material being stamped from being folded when it is moved from this zone to the exhaust gap, and on unplanted ring sections 3 and 4, it is necessary to create forces Pj and RI- that prevent material from flowing out into sections 3 and 4 from the ring section 2. FIG. Figure 4 shows the position after the end of the precipitation of the material in the annular region 2, with the result that the cylindrical part of the product with height h is obtained.

In the following, the marked methods of forcefulness are also reproduced during the settling of the material in the ring sections 3 and 4, as a result of which a cylindrical part of the product is obtained with height, respectively

equal hi and h (fig. 5 and 6). The necessary force on all annular flange areas of the workpiece is shown in FIG. 5 and 6.

When implementing the method considered

fabrication of a hollow broad flange part with four annular precipitation sites in the flange part of the workpiece. However, the number of annular precipitation sites may be different from four in the direction of decreasing or increasing,

since this value depends on the relative width and thickness of the product to be stamped.

Thus, the difference of the proposed method from the known one is that the thickness of the workpiece flange is deposited not over the entire area of the flange, but in separate annular areas, which leads to a significant decrease in the force of deposition not only by reducing the area of deposition, but also the expense of a significant reduction in the friction forces between the workpiece and the pressing and matrix surfaces in contact with it, which is facilitated by the reduction of the plastic deformation focus when the material is deposited. A decrease in the settling force leads to a reduction in the energy consumption for implementing the method.

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Claims (1)

METHOD FOR PRODUCING HOLLOW PARTS WITH FLANGE, in which the central part of the flat billet is subjected to drawing, and the flange part is upset in thickness, characterized in that in order to reduce energy consumption, the flange part of the billet is deposited sequentially along the annular sections in the direction from the axis of symmetry to the periphery, on the non-deposited flange portions are subjected to a force excluding the outflow of material to the periphery of the workpiece, and then the upset portions are subjected to a force to prevent folding. QO Od Sae ke sl