The method of finishing metal surfaces crest wheelset locomotives

 

(57) Abstract:

The invention relates to railway transport. The method is characterized by applying an additional material on the surface of the comb, excluding metals contact crest rail. This is achieved by layering 5-7 µm total coating layer display roughness specially prepared or obtained in the process of grinding the surface of the comb. In the result, without overheating the crest is an opportunity to reduce wear of the ridge using the specified refining non-metallic materials or materials based on copper. 4 C.p. f-crystals, 1 table.

The invention relates to railway vehicles, and more narrowly to the wheelset locomotives /locomotives/.

There is a method of finishing the surface of the crest wheelset locomotives by feeding on the surface of liquid lubricant.

However, the method of refining liquid lubricant, it requires constant feeding, which leads to additional costs, due to its large consumption per kilometer, and, ultimately, the ridge remains without lubrication, which leads to rapid deterioration.

The known method on the I surface hardness of the ridge, for example, using plasma or laser irradiation after repoint ridge to the repair size.

However, elevation of plasma or laser requires heating the surface of the crest wheelset to high temperatures and because of its point of impact causes an uneven tension in a circle band and lead to its rupture.

To avoid uneven stress on a circle crest wheelset and reduce wear ridge in the method of finishing metal surfaces crest wheelset, including preparation of the surface of the ridge and its strengthening, improvement is realized by means of detonation-gas to disperse the powder particles to the speed of 800-1000 m/s, the partial implementation of them into the surface of the crest and the layer of 5-10 μm formation enhancing layer on the surface of the comb showing the original surface or received in the process of reshaping the degree of roughness of her.

The goal is to reach also by eliminating preheating the surface, but with the processing /preparation/ surface ridge with jet-abrasive treatment of her, creating a strong surface ridge of not less than 2.5 to Swedish standards.

The purpose of the achievement of the ceramic powder particles of the metal of the cermet.

Goal achieve that on the surface of the deposited layer of ceramics and cermets put a layer of solid lubricant coatings on the basis of copper, which in turn provides a low coefficient of friction pairs of comb-rail is two to five times compared to conventional hardened steel and rail. Reflected in the claims of the new quality of the received cohesive layers are confirmed experimentally on samples cut from steel 65, passed volumetric Kalka in the conditions of the factory.

For tests on machine MI-1 was produced by the evaporation of various types of coatings with different values of surface hardness and the solid residue obtained by evaporation of the bronze powder company Castolin /Switzerland/ /see table below/.

As the test showed, when the rotation speed of 340 rpm./min, load 600 H, the moment of friction force 450-400 NCM coefficient of friction was very low friction outer surface of the roller with a spray bronze plated and remained almost constant throughout the range of the test.

We produced experimental spraying of the pair of wheels of the locomotive, CMA, which is being tested at the Kuibyshev railway at maneuvering on the station Samara.

1. The method of finishing metal surfaces of the tongue of the pair of wheels of locomotives, including the preparation of the surface of the ridge and its hardening, characterized in that the hardening is carried out by detonation-gas acceleration of hardening particles or enhancing particles to a speed of 800 - 1000 m/s, the partial implementation of them into the surface and cohesive formation in layers 5 - 7 microns enhancing layer on the surface of the comb showing the original or obtained in the preparation process of the degree of surface roughness of the ridge.

2. The method according to p. 1, characterized in that provide the surface roughness of the ridge is equal to the class of purity obtained after turning ridge or after use.

3. The method according to p. 1, characterized in that as ennobling particles using powders of ceramic materials, porcelain-fused-CI on the ridge put a layer of copper-based.

5. The method according to p. 1, characterized in that a hardening layer of metal powder is deposited a layer of uplifting material from an alloy based on copper, which provides a coefficient of friction of a pair of comb - rail 2 - 5 times lower than in case of direct contact of metals crest rail.

 

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