SU863135A1 - Method of producing hollow forgings - Google Patents

Description

(54) METHOD FOR MANUFACTURING HOLLOW QUARKS

I

The invention relates to the processing of metals by pressure and can be used in the manufacture of forgings having the shape of a truncated cone.

A known method of manufacturing hollow forgings in the shape of a truncated cone with a constant wall thickness consists in the manufacture of a hollow billet with outer conical and inner cylindrical surfaces, followed by rolling on a flat 6oiacoM cylindrical mandrel. Moreover, the rolling process is carried out with the application of a force to the side surface of the workpiece, directed to the longitudinal axis of the rolled workpiece at an angle that does not vary throughout the whole process. In the process of rolling, a continuous increase in the blanks due to a change in the wall thickness in the thick-walled part of the blanks occurs until the wall thickness of both ends becomes the same 1.

The disadvantage of this method is greater labor intensity, since it is necessary to manufacture the initial billet with an outer conical surface.

The purpose of the invention is to increase the economy of the process by reducing its labor intensity.

The goal is achieved by the fact that in the method of manufacturing hollow forgings in the shape of a truncated icoHyca with a constant wall thickness along the entire length, including the steps of manufacturing the field of a billet with cylindrical

10 with a hole and rolling it on the mandrel, the billet is made cylindrical on the outer surface, and rolling it is carried out on the end of the mandrel, which is installed so that the end of the shaft closest to the striker is parallel to the striking plane.

FIG. 1 and 2 show the process flow.

The method is carried out as follows.

Claims (1)

A hollow cylindrical billet 1 with a constant wall thickness is placed on a conical mandrel 2, which rests on unequal brackets 3. At the same time, the conical mandrel is installed so that it is parallel to the striker 4 (Fig. 1). The iodine, by the action of the force of the flat striker 4, carried out the rolling of the billet to the required geometrical dimensions, carried out; successive clicks followed by turning around for ttavk around the longitudinal axis. During the rolling process on a shank mandrel, the area of contact of the workpiece with the mandrel is variable along the length of the bale. At the end with a smaller mandrel diameter, the contact width is smaller than at the opposite end. This leads to the redistribution of deformations of the stretching and broadening of the metal, and obtaining forging 5 in the form of a truncated cone. Since the conical mandrel's nearest to the striker is parallel to the striker face, the forging wall is made constant along the entire length (Fig. 2). Example. The method of making hollow packs was tested when rolling out lead lead from the following dimensions: outer diameter 127 mm; internal diameter 77 mm; length 53 mm. The rolling was carried out on a conical mandrel with an angle of inclination of 10 ° forming a generator to the axis of the mandrel. The rolling was carried out in 6 turns with a total reduction of 16.5 mm (2.75 mm per revolution). After rolling, the forging had the following dimensions: Outer diameter 303 mm maximum Outer diameter 297 mm minimum Vnuttsvnny diameter 286 mm maximum Inner diameter minimum- 280 mm Length 58 mm The proposed technical solution allows to get a crawling forging, having the shape of a truncated cone with a constant length wall thickness of cylindrical billet. This eliminates the mechanical processing of the original billet on the outer surface, gives savings of metal and reduces the complexity of machining. In addition, forgings with different angles of cone can be obtained on the same conical mandrel, depending on the degree of drawdown of the initial billet (the degree of {rolling) or its geometrical dimensions. This expands the technological capabilities of the process, reduces the cost of the forging tool. The invention The method of making nojaix forgings in the shape of a truncated cone with a constant wall thickness along the entire length, including the steps of making a billet with a cylindrical bore and rolling it on a mandrel, characterized in that, in order to increase the efficiency of the process by reducing its labor intensity, the billet is made cylindrical on the outer surface, and its rolling is carried out on a conical mandrel; it is established so that the ridges closest to the striker forming its cone were parallel to the striker plane. Sources of information taken into account in the examination 1. US patent number 374099J, cl. 72-370, B 21 K 1 / 38.0 21 K 21/10, 1973. //////// Л fae, 2