RU1816621C - Method of laser working of part surface - Google Patents

Abstract

Usage: mechanical engineering, restoration of worn surfaces of fixed joints. SUMMARY OF THE INVENTION: restoration of worn surfaces is performed by laser processing in the following modes: radiation power P 1200-1500 W, diameter of the focused beam dn 3-4 mm, processing speed V06p. 20-30 mm / s, which ensures grain growth of the structure of the processed material and an increase in the linear dimensions of the part without supply of filler material. 1 ill.

Description

The invention relates to mechanical engineering, in particular to laser processing methods, and can be used in the automotive repair industry to restore worn surfaces of stationary joints.

In the automotive repair industry, there are known methods for restoring worn surfaces using mechanical, electrophysical and electrochemical processing methods,

A known method of restoring worn seating surfaces due to surface plastic deformation of a part material.

But by these methods, it is not possible to achieve the required properties of the surface layer of the reconditioned parts, and the specified strength characteristics are reduced.

The closest technical solution is the method of laser surfacing of the surface of the part, in which the linear dimensions of the part are changed.

However, the known method has the following disadvantages: increased energy intensity of the process, increased consumption of materials due to the use of expensive self-fluxing additive powders or protective gases.

The purpose of the invention is to increase labor productivity, save materials and energy, develop material and energy-saving technologies.

The goal is achieved in that the restoration of worn surfaces occurs due to grain growth of the material structure when processed by a laser beam in the following modes: radiation power P 1.2-1.5 kW; the laser beam diameter dn is 3-4 mm, and its velocity relative to the part V / is 20-30 mm / s, which leads to a change in the linear dimensions of the part.

The drawing shows methods for restoring the seating surfaces of parts due to grain growth of the structure of the processed material,

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A reconditioned part with a cylindrical reconstructed surface is mounted in a rotator of a laser processing unit.

The processing is carried out by rotating the part around the axis and moving relative to the beam along the axis of rotation,.

In order to provide the required heating rate to the temperature of recrystallization of the grain of the material structure, with a laser radiation power of P 1200-1500 W and a diameter of the focused beam dn - 3-4 mm, the processing speed is v06p 20-30 mm / s. At a speed of less than 20 mm / s, the treated surface melts, and at a speed of more than 30 mm / s, a noticeable grain growth of the structure is not observed, since the surface of the part does not have time to heat up to the recrystallization temperature.

These modes for cylindrical parts are provided by the rotational speed w vo6p / ndfleT and the speed of movement of the part relative to the beam will be 2oU

The average increase in the size of a cylindrical part is 1–0.15 mm. The best results were achieved when absorbing coatings were used to reduce the reflection coefficient of the treated surface (for example, aluminum-chromophosphate binder FS-GM, TU 34.4620-78).

A comparable analysis of the claimed solution with the prototype shows that the claimed method differs from the known one in that the processing of worn surfaces of the parts occurs at the indicated modes, providing grain growth of the structure of the material being processed and, as a consequence, a change in the linear dimensions of the workpiece.

Thus, the claimed method meets the criteria of the invention of novelty.

In the proposed solution, the restoration of worn surfaces of parts occurs without the use of filler materials, which allows us to conclude that the claimed method meets the criterion of significant differences.

Using the proposed method of restoring worn surfaces provides the following advantages compared to existing ones:

restoration of worn surfaces of parts without supply of filler material, provision of material) -, energy and resource saving in the process of restoration;

increase in labor productivity.

Claims (1)

SUMMARY OF THE INVENTION A method for laser treatment of a surface of a part, which consists in exposing it to a focused laser beam and moving it along this surface, in that, in order to reduce the material and the energy intensity of the process when restoring parts without using filler material, the processing is carried out with a laser radiation power P of 1200-1500 W, a beam diameter of c) l 3-4 mm and a speed of its movement V0 of 20-30 mm / s.  Methods for restoring the seating surfaces of parts due to grain growth, the structure of b; ather1, & la. a /, external surfaces; b /. internal newsletter .. 1 - laser beam; 2 - restored surface; 3 - etal; 4 - a rotary mirror d is the diameter of the isogenous surface; dt is the diameter of the reconsted L surface; S - recovery