SU912384A1 - Method of producing hollow articles with shaped mainly toothed side surface - Google Patents

Description

(54) METHOD OF OBTAINING COMPLETE PRODUCTS WITH SHAPED, PRINCIPALLY TEETH, SIDE SURFACE

one

The invention relates to the processing of metals by pressure and can be used in the stamping of hollow articles, such as sleeves, with a toothed side surface.

A known method for producing hollow articles with a shaped, preferably serrated, side surface, comprising flashing the workpiece by axial movement of the mandrel and radial stamping of the outer side surface by converging punches 1.

The disadvantage of this method is the low quality of the products in the case when the radial stamping lacks the end support of the workpiece.

The aim of the invention is to improve product quality as well as increase productivity.

This goal is achieved by the fact that according to the method of obtaining hollow articles with a shaped, mainly serrated, side surface, including the insertion of the workpiece and the radial shtampovka outer side surface, the flashing and the radial shtampovka produced simultaneously.

As is known from practice, an open punching (taken separately from the profile of the outer surface) is characterized by the fact that in the process of its reduction the height of the annular billet is reduced due to the low tensile strength of the billet walls.

Separately, the selected profiling of the outer surface of the workpiece is radially stamped, on the contrary, by elongation of the workpiece.

Thus, the combination of flashing the billet with the profiling of the outer surface by radial punching creates favorable opportunities to prevent axial elongation of the workpiece, which means that the bulk of the deformable metal gets a radial outflow.

FIG. 1 shows a diagram of an apparatus for carrying out the method, a cross section; in fig. 2 is a profiling scheme at the initial stage; in fig. 3 is a profiling scheme in the final stage.

Claims (3)

The workpiece 1 is set to its original position between the radial punches 2. Punches give the movement to the center of the workpiece. The final position of the punches is determined by the circumference of the tooth pits, the profile of the product. Simultaneously with the movement of the punches, the forgiveness is moved in the axial direction. 3. Flash 3, entering into contact with the workpiece (Fig. 2) in zone A, distributes its inner diameter, as a result of which the outer surface of the workpiece in zone B will come into contact with punches 1 earlier than the rest of the outer surface of the workpiece and the metal in zone B begins to fill the space between the youngsans: and. Moreover, the axial elongation of the blank in the deformation zone is absent, since the annular part of the blank in zone A is shortened due to the stretching of this part. Upon further movement of the piercing 3 downwards and moving the punches to the center of the workpiece, the deformation zone A develops. At the end of the deformation (Fig. 3), the space between the punches is completely filled with metal, forming the desired profile. The diameter of the piercing 3 is selected from the condition of providing an increase in the outer diameter of the workpiece to the calculated average circumference of the teeth of the product profile and is empirically refined. Removal of the workpiece from the firmware was carried out during its reverse course with the help of sliding stops (not shown). Example. C ::. Indian and 20KhNZA steel are used as the blank material. Lead billet is deformed into a cold one. The blank of art. 20HNZA is heated to 1050-1100 ° C. As a result of the radial stamping combined with the firmware, a stamped forging of a flat gear (det. M04.38 102 of the T-4 tractor) is obtained, having the following parameters: the number of teeth - 15; module 5; outer diameter 85; gear thickness - 40; bore diameter 46 mm. Pipe billets with a height of 45-47 mm with an outer diameter of 60- 65 mm and an opening diameter of 30-35 mm are used. Stamped forgings after hot stamping and 1 .1.5 mm of machining allowance. By moving the metal from the center of the workpiece towards the radially converging punches and as a result of the absence of axial flow of the metal, the quality of the products obtained is improved. In addition, productivity is increased by combining the striking techniques and radial stamping in time. Claims The method of producing hollow articles with a contoured, preferably serrated, side surface, including insertion of the workpiece and radial stamping of the outer side surface, characterized in that, in order to improve the quality of the products, the insertion and radial stamping are carried out simultaneously. Sources of information taken into account in the examination 1. USSR author's certificate number 203451, cl. B 21 K 1/30, 03.02.61 (prototype). Fi.Z