SU680794A1 - Tool for cross wedge rolling - Google Patents

Description

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The invention relates to the processing of metals by pressure n can be used in the manufacture of products such as stepped shafts.

A tool for cross wedge rolling of articles such as stepped shafts is known, which contains a base-mounted wedge having deforming edges inclined at an angle to the base plane and calibrating the face parallel to the base plane forming the lead-in and calibrating marks of the wedge l.

However, the large length of the known tool reduces the productivity of the rolling process, as well as the quality of rolled products, especially when rolling it with a reduction ratio of more than two, since an increase in the contact length of the tool with the workpiece on the rolling part can lead to a cavity in the bundle.

The zero of the invention is to increase the production quality and quality of

products by reducing the length of the tool.

This is achieved by the fact that the lead-in area is made with two additional faces, successively conjugated along edges between themselves and with deforming faces, each of which additional faces being located to the plane of the base at an angle of inclination smaller than the angle of inclination of the deforming edge adjoining it.

The edge of the conjugation of additional edges between each other is relieved.

FIG. 1 shows the proposed tool, scan; in fig. 2 is a section A in FIG. one; in fig. 3 - settlement BB in FIG. one.

The proposed tool for cross-wedge rolling contains a calibrating face 1 parallel to the plane of the base, deforming the faces 2, inclined at an angle about the plane of the base. The sharp shoulder of the lead-in area

rolled by surface 3, which forms parallel to the axis of rolling.

Between the deforming surfaces 2 and the backing sheer 3 over the entire length of the lead-in area. made two additional g-ranni 4, the angle of inclination to the axis of rolling cX. , less angle aА-. These additional surfaces 4 cut off part of the backing surface so that the cross section of the blank section can be represented as two trapeziums, set one on top of the other.

The proposed tool works as follows. The rolling process begins with the introduction of a wedge 6 wedge in the workpiece. As the lead-in area is introduced into the workpiece, axial tensile forces increase. The presence of additional edges 4c in the lead-in section with the C / C6 angle of inclination leads to a decrease in axial tensile stresses and the rolling process proceeds normally, without stretching and thinning the rod

Reducing the width of the backing surface 3 by making additional surfaces 4 reduces the length of its contact with the workpiece and prevents the formation of a cavity, reduces the ovality of the section of the rolled rod, and the possibility of crushing it is eliminated. Thus, the possibility of rolling with a degree of reduction of more than two is provided.

The proposed tool guarantees quality products without internal friability and cavities, because

the length of the contact between the workpiece and the tool is reduced by the amount of the rolling half-step. The consumption of die steel is 5–10%, as the tool length is reduced.

Claims (2)

1. A tool for cross-wedge rolling of a stepped-roll type product containing a base wedge having deforming edges inclined at an angle to the plane of these bases and a calibrating face parallel to the plane of the base forming the fact that, in order to increase the productivity and quality of the products obtained by reducing the tool length, the lead-in section is made with two additional edges successively adjoining along the edges between oboj and deforming facets, each of the additional facets disposed to the base plane at an angle of inclination smaller than the angle of inclination of the mating faces deforming it. 2. The tool according to claim 1, of which is from the fact that the edge of the mating of additional faces between each other is ground out. Sources of information taken into account in the examination 1. Andreev GV, et al. Cross rolling, Minsk, Science and technology, 1974, p. 8.