SU590058A1 - Method of forging workpieces - Google Patents

Description

(54) METHOD FOR FORGING PREPARATIONS

one

The invention relates to the field of metal forming and can be used in forging and pressing production for forging ingots.

There is a known method of forging billets, which includes drawing in combined dies 1.

There is a known method for forging workpieces made in cross section with three protrusions arranged at an angle of 120 °, including, drawing the workpiece with combined strikers with a turning-over of 120 ° 2.

The disadvantage of this method is the low quality of forgings due to the formation of clamps of the concave faces of the workpiece and incomplete development of the metal of the axial zone of the workpiece and protrusions.

The purpose of the invention is to improve the quality of forgings. To do this, first, a 120 ° cant with a single-degree s is rotated by no more than () 10% to obtain an intermediate billet of a trihedral shape, then it is edged by 60 °, and a further 120 ° cant be drawn to hexagon shape.

FIG. 1 schematically shows a blank for forging (initial ingot); in fig. 2 is the same, section A-A in FIG. one; in fig. 3 (ad) hse sequence of forging operations.

The workpiece (see Fig. 1 and 2) is made in cross section with three protrusions located at an angle of 120 °, the area of which exceeds the length of the rest of the workpiece. Thus, the workpiece has three concave faces.

The method of forging the drainage is as follows.

The workpiece 1 is installed in the lower cut-out head 2, placing it with one of the protrusions into the cutout of the striker (see Fig. 3a), then stretching the workpiece, i.e., produce successive transverse upper flat striker along the remaining two

protrusions of the workpiece along its entire length.

After stretching, the billet is turned 120 ° around the axis (see Fig. 3, b, c, d), the nest is again produced, etc. At the same time, the degree of single reduction in cross section is not

exceeds 10% of the cross section of the original preform 1, thus avoiding the occurrence of clips of concave faces of the preform. Broaching with a 120 ° turn-off is carried out until a triangular (triangular in cross-section) section is routed through the weft billet,

that is, until the concave faces exit into the visible.

After that, the intermediate trihedral

the workpiece is edged at 60 ° around the axis (see

FIG. 3, e) and continue stretching the upper

flat brisk. Magnitude

to be as high as possible for a given workpiece material. After passing along the entire length of the rib, the blank is turned 120 ° and compressed (see Fig. 3, e, g, g) until the hexagonal shape is obtained.

An example of a specific implementation of the method.

Forging was carried out on a press with a force of 3000 tons.

An ingot made with three 120 ° longitudinal projections of 9H2MF steel weighing 7 tons heated to 1180 ° C was fed to a combined hammer head of 500 mm and a cutout angle of the lower hammer 110 °. After seaming the trunnions, the ingot was installed with one longitudinal protrusion into the lower notched firing pin, and the other two - under the upper flat firing pin. Then, an ingot was drawn with a unit stroke of 80 mm, which corresponds to a degree of deformation of about 9%. After that, the ingot was turned to 120 ° and was again drawn. After six canting pas 120 ° and drawing after each canting (with a size of a single reduction of 80 mm) an equilateral triangle was obtained in the cross section of the workpiece.

The resulting three-sided workpiece was turned to 60 °, setting it with two ribs to the bottom notched firing pin, and the third — to the top flat firing pin. Then they were drawn with the maximum possible amount of a single reduction, which was 150-180 mm. After two cants of 60 ° pa and a forging, a hexagonal forging was obtained; it was used as a billet to obtain the forging of a round roll with a traditional method.

The shape of the intermediate billet, triangular in cross section, makes it possible to eliminate the formation of surface clips with its further stretching with 120 ° pa.

The described method allows to work out the metal of the axial zone of the workpiece due to the fact that the triangular intermediate workpiece skimmed by 60 ° is installed in the strikers in such a way that a rigid stress-strain state is created, in which the acting forces directed perpendicular to the deforming planes of the strikers, gathering in the center of the workpiece.

The billet metal is uniformly worked over the entire cross section, since when forging a three-sided billet, which excludes the possibility of the formation of surface clips,

Along 60 ° turnoff, it is possible to compress the workpieces in non-deformed longitudinal projections with the degree of deformation possible for a given material. This improves the quality of the forgings.

Claims (2)

1.Bryukhanov A.P. Forging and stamping. M., 1975, p. 68 2. USSR author's certificate number 276707, cl. In 21J 1/00, 1964. Fi.g.210%