SU685407A1 - Method of rolling-out of rings and mandrel for effecting same - Google Patents

Description

The invention relates to the field of mechanical engineering and can be used in the manufacture of xlice blanks from hard steels and alloys on free-forging presses.

The known method of rolling rings, which consists in the sequential deformation of the workpiece and its rotation relative to the mandrel 1. When rolling in a known manner on a smooth mandrel rings of hard steels and alloys because of the significant total deformation of the ring height and the unfavorable scheme of the stress-deformable state, causing large tensile stresses in the deformation zone, cracks and fractures appear on the surfaces of the workpiece. Rolling on a smooth mandrel is accompanied by a significant broadening of the workpiece, which leads to a metal consumption.

The purpose of the invention is to improve the quality of the rings and save the metal.

The goal is achieved by the fact that the workpiece is deformed, a series of rolling on a profiled and smooth cylindrical surface, beginning to deform on a profiled surface. The method is carried out by rolling on a mandrel made of a composite of profiled and smooth cylindrical parts, forming a working stage, and the contour of the profiled portion is outlined by a closed sinusoidal curve, while the mandrel can be made of several

0 working steps of various diameters.

FIG. 1 shows the scheme roll

ki rings on the profiled mandrel; in fig. 2 - follow the scheme

5 expansion of the ring on a smooth mandrel, the arrows indicate the direction of the predominant metal flow; in FIG. 3 a composite mandrel; in fig. 4 - profiled part of the frame, cross section; in fig. 5 compound mandrel; in fig. 6 shows an embodiment of the mandrel.

The proposed method is carried out as follows. On a movable table

5 press set two supports. The deposited and stitched billet is snapped up onto the profiled part of the mandrel clamped in the pliers of the manipulator or rotated by the tilter. Thereafter

0

A mandrel with a lock-7 is installed on the supports and is fed under the upper face of the press. Rolling on the profiled part of the mandrel is carried out before obtaining on the inner surface of the workpiece a profile corresponding to the working profile of the tool. Then, shifting the workpiece to the smooth cylindrical part of the mandrel, continue rolling to obtain a smooth inner surface of the workpiece.

The alternation of these operations is carried out to obtain the required dimensions of the workpiece.

Due to the alternation of rolling on the core and smooth cylindrical parts of the mandrel during all rolling operations, in the deformation zone, the necessary scheme of stress-strain state is provided, ensuring the predominant flow of the billet metal in tangential stress (increase in stretch) and difficulty in height (decrease in broadening) ).

If it is necessary to obtain an annular billet of large diameter, the alternation of operations is performed to obtain the maximum possible diameter of the billet at a given diameter of the working stage of the mandrel,

The tool replaces the tool with a larger diameter and continues the process of rolling by alternating forging on both parts of the mandrel.

The mandrel is a shaft, one part of which has a smooth cylindrical surface 1, and the other a profiled 2, which in section is a circumferentially closed sinusoidal

curve. Smooth and profiled parts form one working step.

Working steps on the mandrel may be several. .

The mandrel can be made a national team and consist of a shaft 3 and composing elements pressed on it, which are parts of the working stages of different diameters.

The fastening of the diaphragm elements to the shaft is carried out by wedges or dowels 4.

Claims (2)

Invention Formula 1c. A method of rolling rings, which consists in sequentially deforming the workpiece by striking the mandrel and turning it relative to the mandrel, characterized in that, in order to improve the quality of the rings and saving metal), the workpiece is deformed, the sequence of rolling on the profiled and smooth cylindrical surfaces, the Deformed on the profiled surface. 2. The mandrel for carrying out the method according to claim 1, characterized in that it is made up of a composite of profiled and smooth cylindrical parts that form a working stage, and the contour of the profiled part is outlined by a closed sinusoidal curve. 3, Reference item 2, characterized in that it is made of several working steps of different diameters. Sources of information taken into account in the examination 1. Ball I. IM Study of the reformation of the workpiece at Raskars. Forging and stamping production, p. 5, 12, 1965. /