RU2247173C2 - Method of combined surface treatment of part - Google Patents

Abstract

FIELD: metalworking; application of anti-friction cladding coats; mechanical engineering.

SUBSTANCE: proposed method includes rubbing the surface by revolving alloying roller made from copper or its alloys at simultaneous electromechanical treatment by means of sintered-carbide roller. Part is set in rotation during treatment. Rotation of alloying roller is effected at circumferential velocity different from speed of rotation of part; axis of rotation of roller is located at acute angle relative to its projection on plane of motion passing through axis of part being treated and zone of contact of part with rollers in way of vector of motion of tools along axis of part being treated.

EFFECT: improved quality; enhanced wear resistance due to smooth application of coat and filling of recesses.

Description

The invention relates to the field of metalworking, in particular, to increase the wear resistance of parts such as bodies of revolution by friction-mechanical deposition of an antifriction clad coating and smoothing electromechanical effects.

Known methods of processing the working surfaces of products [1], [2] and others by electromechanical hardening. Here, the tool for electromechanical smoothing of the surface is a roller fixed to the axis. During processing, a current of high force and low voltage passes through the contact zone of the roller with the product, as a result of which the surface of the contact zone of the product is subjected to strong heating, under the pressure of the roller, the protruding ridges of the surface are deformed and smoothed, and the surface layer of metal is hardened. The method significantly changes the physical and mechanical properties of the surface layer, allowing to increase wear resistance.

However, this processing method does not provide the required microrelief, wear resistance of products and high anti-seize and anti-friction properties of the surface layer, which does not exclude the setting of working surfaces.

A known method of processing steel and cast-iron surfaces of products [3], which is adopted as a prototype, which consists in the fact that simultaneously, one after the other, they first rub the working surface of the product with one tool - a donor made, for example, of copper, then electromechanical smoothing of this surface another tool made of hard alloy, both tools with the product forming a common working electrical circuit.

This method improves the quality of the processed surface. However, it does not differ in the high stability of the cladding process on the working surface of the product.

Achievable technical result according to the claimed invention is a further increase in the quality and wear resistance of the treated surface of the product by forcing the cladding layer uniformly over the entire area of the working surface and better filling the hollows of the original profile.

The specified technical result is achieved due to the fact that during processing the part is rotated, while the alloying tool roller is rotated at a peripheral speed different from the rotation speed of the workpiece, and the axis of rotation of the roller is placed at an acute angle to its projection onto the plane of movement passing through the axis the workpiece and the contact zone of the part with the tool rollers, in the direction of the vector of movement of tools along the axis of the workpiece.

The method is as follows. In the process of combined combined surface treatment of a part: friction-mechanical rubbing and incorporation of an anti-friction clad coating into the surface layer with a copper-based tool roller and smoothing electromechanical action with a carbide roller, when both tools and the part form a common working electrical circuit, additionally, when rubbing the surface of the part, automatic mode, forced rotation of the alloying roller with a peripheral speed providing significant sliding of surfaces in the contact zone of this roller with the part, while the axis of the roller to enhance the sliding effect (by changing the direction of the relative velocity vector) is placed at an acute angle to the helix — the path of the relative movement of the roller along the surface of the part, which facilitates the shift of the alloying component layer , its separation from the roller and more efficient filling with alloying elements (particles) of the depressions of the initial profile of the part, providing a better surface microrelief of the surface Nogo layer and uniform thickness of the cladding coating on the part.

Thus, on all samples processed by the proposed method, a regular modified microrelief and a thermally hardened surface layer structure are stably created on the surface, which help to keep the lubricant in contact, increase the wear resistance of the friction pair and increase workloads.

Literature

1. Askinazi B.M. Hardening and restoration of parts by electromechanical processing. - L .: Mechanical engineering. - 1989. - 184 p.

2. Copyright certificate No. 1579745, 24 V 39/04. Publ. 07/23/90. Bull. Number 27.

3. Patent No. 2193606, C 23 C 24/02. Publ. 11/27/02. Bull. No. 33.

Claims (1)

A method of combined surface treatment of a part, including time-wise surface rubbing operations with a forcibly rotating alloying tool roller made of copper or its alloys and hardening electromechanical machining with a carbide tool roller, characterized in that the part is rotated during processing, while the alloying tool roller is rotated at a peripheral speed different from the speed of rotation of the workpiece, and the axis of rotation of the roller is placed at an acute angle ohm to its projection on the movement plane passing through the axis of the workpiece and parts of the nip rollers with tool, in the direction of the displacement vector instruments along the axis of the workpiece.