SU837509A1 - Method of cross wedge rolling - Google Patents

Description

one

The invention relates to the processing of metals by pressure and can be used in the manufacture of products such as camshafts.

The known method of cross-wedge rolling, which expands the cores with claddings of wedge tools, installed by the method of direct rolling, or by the method of reverse rolling l.

The disadvantage of this method is that with its help parts are obtained only with an external profile symmetrical about the axis of the part.

There is also known a cross wedge rolling method in which a cylindrical billet is rolled to form a boring and is formed by wedging tools with straight wedges first and then with reverse rolling L2.

The disadvantage of this method is that, in its implementation, the process of rolling the rod and the set of the collar are carried out simultaneously. Moving wedge tools capture the rolled billet - and cause it to rotate, the inclined edges of the tool, installed according to the method of rolling, compress plot the length of the workpiece and besiege him of the collar. The axial forces applied to the collar act symmetrically with respect to the axis of the part on the symmetrical volumes of the metal. Thus, it is not possible to create conditions that ensure an asymmetric distribution of the metal relative to the axis of the product, i.e. the method eliminates the receipt of products with asymmetric profile steps.

The purpose of the invention is the expansion of technological capabilities by

5 steps in the preparation of an asymmetric profile.

The goal is achieved by haem, which in the method of cross-wedge rolling, in which the billet

The cylindrical shape is rolled with the formation of a collar and the flange is molded with wedge tools first, and then by reverse projection, the flange is molded with new tools in two stages. At the first stage, a portion of the cylindrical surface of the collar with the length L equal to the length of the tool, and at the second stage they are redistributed

0

Material from the edges of the rolled part of the urta to the unrolled.

On fi1. 1 shows {a sequence of operations for implementing the method; in fig. 2 - cross-section of the blank of the workpiece after the operation of rolling sectors; in fig. 3 - view of the detail from the end after the operation of the asymmetrical collar.

For the implemented method 1, the wedge tools 1, 2 and 3 are mounted on one or several movable bases. The initial blank in the first operation is a cylindrical shape blank 4 of a circular or close to a circle section. At positions 5 and b, the intermediate between the operations of the product are shown. To perform sector rolling, the length of the tool, 2, is chosen equal to the arc length of the rolled part of the cylindrical surface of the collar (Fig. 2). The remaining undiscovered material, the cross section of which is shown as a hatched area in FIG. 2, is used to fill the volume of asymmetry of the collar. In the process of implementing the method, the wedge tools 1 (Fig. 1) are reported to be in translation, in which they are inserted into the original workpiece 4 and are brought into rotation, during which a predetermined deformation is carried out by rolling. The result is an intermediate billet 5 in the form of a rod with collar. In the same way, a wedge tool 2 is inserted into an intermediate billet 5 of a portion of the cylindrical surface of the collar with an arc length L (Fig. 2). 1, the line tool 3 serves to perform an asymmetric set of a collar by reverse rolling to obtain a part 7, which is a rolled rod with a collar of an asymmetric profile, for example in the form of a cam. The distance between the side calibrating surfaces of the wedge tool is equal to the final width of the collar.

The method is carried out as follows.

The wedge tool 1 is reported to have a forward movement, during which it is inserted into the original workpiece 4. Friction forces arise between the workpiece and the tool, due to which the workpiece is rotated and deformed by inclined deforming edges. As a result

rolling on the tool 1 get intermediate billet 5 with a collet of the initial diameter width. Then, a wedge tool 2 is inserted into the collar of the intermediate billet 5 and, in the same way, a part of the cylindrical surface of the bore is molded on it (blank b). The perimeter of the deformable part of the collar is provided with a tool length. The perimeter of the collar on the intermediate blank b is divided into two parts; one part of the collar is made in width Ef, the second - 6.2. The tool 3 is inserted into the brute there, its width is maximal and deform it by compressing the non-rolled part of the ring on the tool 5 2. As a result of the local deformation of the collar, an asymmetrical metal flow is obtained on it, as shown in FIG. 3. As a result of rolling on all three operations, a rod 7 with an asymmetrical shoulder, or a similar part with several asymmetrical shoulders, is obtained.

In this way, it is possible to obtain precise blanks for subsequent non-punching or for further machining of camshafts. The annual economic effect of saving material is 59630 r.

Claims (2)

1. Authors certificate of the USSR 546416, cl. B 21 H 1/18, 1975. 2. Authors certificate USSR 599899, cl. B 21 H 1/18, 1976.