RU1773539C - Method of obtaining staggered shafts - Google Patents

Abstract

Usage: for the manufacture of shafts, axles and other stepped products by wedge rolling. SUMMARY OF THE INVENTION: a heated billet 1 is stacked on two drive support rollers with a pair of deforming rings placed on each of them, moved to the wedge tool 6 and rolled in three stages. At stage I, wedge-shaped tools form ring grooves with a width less than the width of the deforming ring by a value of h equal to 0.4D h 0.2D, where D is the initial diameter of the workpiece. At the second stage, the annular grooves are distributed with a wedge tool while simultaneously compressing the workpiece at the locations of the annular grooves with deforming rings to a depth b equal to about 1 / 2D (1 -), where b is the degree of compression of the workpiece. At the III stage, the end sections of the workpiece are deformed by moving the deforming rings towards the ends of the workpiece in accordance with the movement of the deformation centers of the wedge tool for each revolution by the amount of A 2 L RK D where RK is the rolling radius of the workpiece; / 3-point angle of the wedge tool. The preform is further calibrated by the deforming rings during their movement in the direction opposite to the direction of their movement during deformation. This method allows to improve the quality of the products obtained by eliminating wrinkling and bending from the end sections at the final stage of deformation, as well as to increase the cleanliness of their surface. 6 ill.

Description

Ratios of rolling parameters

Experiment Results

h 0.2 D

h 0.4 D "

The amount of movement of the deforming rings is less than 27tRK0

The amount of movement of the deforming rings is greater than 2 l RK /

At the end of stage 1, slippage is observed

tool relative to the workpiece due to the small size

contact forces friction leading to the termination of pro. forming process At the second stage of rolling, when the workpiece is crimped by deforming rings, overflow of the rolled step is observed with an excess volume of metal, which leads to significant deviations from the circularity of the cross section

Due to the large working deformations associated with the control panel tool, significant deviations from the roundness of the rolled sections are observed, reaching

0.8. ,, 1.2 mm

Due to high tensile stresses, non-contact tensile deformation is observed, accompanied by thinning of the rolled sections to 0.7, .. 0.8 diameters.

Experiment Results

Aa

Figure 1

Fng 3

FIG. 5

FIG. 4

FIG. G