SU1752530A1 - Method of tooling parts by surface plastic deforming - Google Patents

Abstract

Use: finishing-hardening treatment of rotational surfaces of relatively short length (for example, rollers and bearing rings, camshaft and crankshaft necks of a car). The essence of the inventions: the parts set the rotation, and the tool is turned around the normal to the work surface passing the center of the contact pad. In the course of processing, the direction of axial mixing of the tool is preliminarily carried out, and then the tool is rotated in the direction of increasing the angle between the velocity vector of the part: the thrust of the axial displacement of the tool. 2 Il.

Description

The invention relates to mechanical engineering and can be used for part-hardening processing.

rotational surfaces with respect to ne-. long lengths, for example, rollers and bearing rings, crankshaft and camshaft necks, etc .:

A known method of machining parts by surface plastic deformation, in which parts set rotation, and a cylindrical tool is rotated around the normal to the work surface passing through the center of the contact point of the tool and the part. The tool is rotated by pulling it in and on a given division and angle.

The method allows to improve the quality of processing, because in the course of the swing, the tool inevitably passes through the position corresponding to the juxtaposition of the tool-forming parts and the part, since the amplitude of the oscillation obviously exceeds the error of the tool installation.

However, along with this, a part of the machining time of the tool and the part is carried out under the conditions of the absence of conjugation of the tool and part components. On the treated surface, a mesh relief is formed in the form of symmetrically on the cloned grooves. Such a relief is favorable for the under-neck of the shafts; however, for the surfaces of sliding and stone bearings, the presence of waviness leads to the appearance of vibrations during their operation. The purpose of the invention is to expand the technological capabilities by improving the quality of machining.

Improving the quality of processing is due to the fact that, when implementing the method, it is possible to ensure accurate mating of the tool and part generators, since the method involves controlling the presence of a skew in the tool and part generators by determining the direction of the axial displacement of the tool. . ; ; -; Ј .. -: ..-

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Figure 1 presents the scheme of implementation of the method; Fig. 2 shows the same embodiment.

PRI me R. In the processing of parts

1 cause rotation. The cylindrical tool 2 is elastically pressed against the surface to be treated. The possibility of axial displacement of the tool is ensured by the elastic deformation of the end supports 3

by a small amount A (FIG. 2).

With a skewed tool axis

2, relative to the axis of the part 1 (angle 3 3 0), a component force appears that moves the tool in the axial direction (Fig. 1). At the same time, the latter is pressed against one of the supports; therefore, the possibility of controlling the axial displacement of the tool is easily realized. As shown in FIG. 2, this can be achieved by closing the tool with contacts of an electrical circuit including light bulbs.

/ And or L2. Axial displacement of the tool 2 to the right (p 0) leads to the closing of the power supply circuit of the light bulb. In this case, the tool is turned counterclockwise around the normal to the surface to be machined, passing through the center of the contact pad (point A) upwards, angle a between the part velocity vector / d and the axial direction of the tool Vu. To do this, use the mechanism 4 of the rotation of the tool (figure 2). In the event that the instrument is turned to the opposite side of the one shown in the diagram (/ 0), it moves to the left and closes the left contacts. The light / H turns on. The tool is turned clockwise. The turn of the tool is stopped when the bulbs L1 and L2

not hot. At the same time, the generators of the tool and the parts are precisely mated at the point of contact, since the forces acting on the tool are balanced.

The method can be carried out in two ways. In the first embodiment, the turning and setting of the tool is carried out when processing the test piece (before processing the batch), after which the tool is fixed. In the second embodiment, a constant tune-up (rotation) of the tool is carried out in the course of processing using the following automatic tool rotation drive.

The proposed method makes it possible to improve the quality of processing by eliminating the surface waviness and ensuring the stability of surface hardening along its length. These advantages of the method allow it to be used in machining high-precision parts of rolling and sliding bearings.

Claims (1)

Invention Formula The method of machining parts by surface plastic deformation, in which the parts set the rotation, and the cylindrical tool is turned around the normal to the machined surface passing through the center of the contact pad, characterized in that, in order to expand technological capabilities by improving the quality of processing, the axial displacing the tool relative to its average position and then turning the tool in the direction of increasing the angle between the vector soon detail and the direction of axial displacement of the tool. R  l 7®т®Fig. 2 Fig 1