RU1821278C - Cylindrical ring expansion method - Google Patents

Abstract

Usage: in the manufacture of profile ring blanks. SUMMARY OF THE INVENTION: Before the workpiece is deformed by wedge-shaped converging rolls, the workpiece dimensions are calculated. The calculations are carried out by simulating the rolling process of two separate rings between wedge-shaped and cylindrical rolls. The above rings should form a single ring with the inner and outer surfaces formed by the corresponding surfaces of the above rings when combined. The average diameter of the initial blank is determined from the equation, 02h-0.15h2, where O0 is the average diameter of the profile blank, h is the penetration depth of the roll wedge. 1 C.p. f-ls, 2 ill.

Description

The invention relates to mechanical engineering, in particular to pressure metal processing, which can be used in the manufacture of ring shaped blanks. - -. ; . . ;. . ... /

The aim of the invention is to increase the utilization of the metal by producing high ribs on the inner and outer surfaces of the ring from a material with low gauge filling ability.

This goal is achieved by the fact that the method roll out the original workpiece having an average diameter

. . V

Dcp0-Dcp + T, 02h-0.l5h2j

In FIG. 1 shows a profile blank for two parts of a combustion chamber (KS): in FIG. 2 - the initial moment of rolling the original workpiece in wedge-shaped rolls.

The method was carried out as follows. We developed a drawing of a profile blank for two heads of K.S. according to the processing conditions in the machine shop (Fig. 1). Got the dimensions of the profile blank B-J99 mm, lM5 mm,, MM, mm. The volume of the profile ring was calculated - VK-19.6 X 10e mm3. Then they acted as follows. It was suggested that the wedge-shaped rolls deform two rings independently of each other so that after deformation they can form a single ring (Fig. 1), provided that the outer surface of the second ring is aligned with the inner surface of the first. The first ring is deformed by the wedge-shaped roll rip of the Outer surface, and the second ring is deformed by the same-shaped roll on the inner surface.

Based on the foregoing, sample sizes were selected. Outer diameter r00

ABOUT

to vi with

Sample - 204 mm, inner diameter - 125 mm, width - 58.8 mm. Cast samples of lead turned on a lathe were used as samples. As a model of the rolling machine RM-2000, the 6R82G horizontal milling machine was chosen. A wedge-shaped roll with an angle of 94 ° was worn on the mandrel of the machine (instead of the cutter), a cylindrical roll (lower) was also worn on the mandrel, which was clamped in a vice mounted on the table of the machine (Fig. 3). The wedge-shaped indentation process was carried out at a spindle speed of 667 and a vertical feed of -1.5 m / s, which corresponds to the data of the RM-2000 rolling machine.

The results of measurements of the rings after rolling were tabulated.

The total tangential stretch was

D 185

1 J ± L -

L-o7

125

To solve these problems, an approximation program was compiled on a SM-3 computer in the DS SM mode. T.S. No. 001.6175. After mathematical processing, the results of measurements and calculations obtained the dependence

.15h2-1,02h,

where D is the inner diameter of the sample when indenting a wedge-shaped roll;

Do is the inner diameter of the sample;

h is the penetration depth of the roll wedge.

For profile rings, we rewrite dependence (1)

DCp ° Dcp + 1.02h-0.15n

We define

n D + d „8234-586 7P ..- DCp - - --- O --- 704.5 MM

(see Fig. 1) After substitution of dimensions (2), we determine the average diameter of the workpiece under the roll DCp °:.

5 + 1.02 X 45-0.15 X (45f 456mm

The mm was chosen, the radius R of the wedge rounding was determined - mm. Assigned stamping slope 3 °.

The width of the workpiece for the roll is

B0 B + 2hi X X 41X 0, mm

These calculations were carried out for the following reasons:

a) the top of the wedge should have a rounding, based on the resistance of the equipment;

b) the width of the initial workpiece should be such that it touches the tool at three points when it is captured by the rolls - this will provide support for the peripheral layers of the metal of the workpiece and ensure stable rolling.

We write the condition of constant volume in the following form:. ;

n ° Vk DcP nBoHo

twenty

andVk 19.6 X 106 0 nBoDcp 3.14X103X456 .-.

 133 mm

25

Do Dcp0 + Ho 456 + 133 589 mm do DcP ° -H0 456-133 323 mm

thirty

40

45

fifty

55

Thus, the sizes of the initial blank for rolling were determined taking into account the filling of the corner zones of the caliber. The rolling of the profile rings from the KhN65VMBY alloy confirmed the complete design of the profile. Design quality was evaluated visually and using templates. The application of the invention makes it possible to obtain a profile of a ring with high ribs on the inner and outer surfaces of the ring from a material with low gauge filling ability;

. reduce material consumption - 95 kg per 1

Claims (2)

1. A method of rolling cylindrical rings, in which the workpiece is deformed by wedge-shaped converging rolls, characterized in that, in order to expand technological capabilities by making it possible to obtain rings of complex profile and increase the utilization of metal, preliminarily calculate the size of the workpiece by simulating the rolling process two separate rings with wedge-shaped and cylindrical rolls, which, after deformation, form a single ring with inner and outer surfaces formed by the corresponding surfaces of said rings. 2. The method according to p. 1, characterized in that the average diameter of the initial preform is determined from the equality , 02h-0,15h2, where Do is the average diameter of the profile blank; h is the penetration depth of the roll wedge. fi & i fie. 2