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Method of finish anti-friction treatment

IPC classes for russian patent Method of finish anti-friction treatment (RU 2256725):

C23C26 - Coating not provided for in groups ; C23C0002000000-C23C0024000000

C23C24/04 - Impact or kinetic deposition of particles

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FIELD: finish treatment of precision friction pairs requiring high quality of treatment at retaining starting dimensions, for example, high-precision machines and tools and diesel engine supply equipment.

SUBSTANCE: friction surface is degreased, dried and technological medium is applied to it by means of brush, for example. Brass rod is fitted at angle of 45-60 deg. relative to surface being treated. When rod is pressed at simultaneous switching-on of electric machine, it forms shocks over surface being treated; energy of shock is equal to 0.5-0.7 J.

EFFECT: improved quality of coat at low porosity.

2 cl, 2 dwg, 1 ex

The invention relates to the technology of finishing precision of friction pairs, requiring high quality processing while maintaining the original dimensions, for example, directing a high-precision machine and equipment, parts supply equipment diesel engines.

The way the friction of the brass plating to enhance the durability and reliability of components of friction are known [1, C. 37]. The essence of this method (similar) is that the surface friction on the rotation bodies rubbed brass or bronze rod. After 3-4 passages brass rod controlled coating - its porosity and thickness is not changed.

The disadvantage of this method is the large porosity receiving coating, which reduces its performance.

As the prototype was taken] way brass plating [1, C. 43]. The method involves rubbing the surface friction mediostream rod in the presence of process fluid. When] the way to the workpiece is fed to the negative pole, and the friction rod is positive, the optimal current density 40 A/mm². It is noted that] the films have a lower porosity, higher strength of adhesion with the base metal, the durability of the friction is much higher.

Fault the m prototype is the complexity of the implementation process due to the necessity of applying a constant current of greater strength.

The technical objective of the proposed solutions is to reduce the porosity of the surface friction.

This object is achieved in that in the known method the finish anti-friction treatment, including rubbing of the friction surface mediostream rod in the presence of process fluid, rubbing mediostream rod is in shock vibration mode, while the impact energy of the rod is not less than 0.5 joules. Friction brass lead shock vibration method using, for example, machine electric shock, MAU-125 with impact energy of 0.5-0.7 j and the angle of the brass rod to the processed surface 45-60° in the presence of the same technological environment and the roughness of the friction surface, as in the prototype. While finishing antifriction treatment may be performed in different directions.

Fig. 1 shows the surface obtained by known techniques.

Fig. 2 - surface, obtained by the proposed method.

The method is as follows. The surface friction, if necessary, pre-treated with any finish way so that its surface roughness was in the range of Ra=0,16-l,25 μm. Next, the surface is degreased, dried and covered in some way, for example cysto is coy, technological environment. The compositions of technological environments are given in [1]. For alloy steels is a mixture of glycerol with 10% aqueous hydrochloric acid solution. Brass rod with a diameter of 4-8 mm, inserted into the machine spindle electric shock, MAU-125 at an angle of 45-60°, touches the workpiece surface. The diameter of the rod is not of great importance, since the processing is its edge. When pressed on the rod and the simultaneous inclusion of percussion electric cars have shock brass rod on the treated surface. The impact energy is 0.5-0.7 j, frequency 50 Hz, the maximum stroke of the rod of 1.5 mm At angles brass rod, large 60°, the processing performance is reduced. The frequency of strikes brass rod proportionally affects the performance. At lower (50 Hz) frequencies, the performance decreases for large increases. However, for frequencies larger 50 Hz, special frequency Converter, which is impractical because of the existing performance ~1,2÷1.5 cm²/min is sufficient for productive work. The impact energy 0,5÷0.7 j is sufficient for the formation of high quality coatings.

Percussive treatment puts the brass in the notches rough surface, almost never leaving the pores and voids. The opportunity to which the processing in different directions also helps to reduce the porosity of the resulting coating.

Example. A sample of steel of ZOGGS (sizes 45×90×10 mm), has a hardness of HRC 51, RA=0.12 to 0.2 μm was subjected to finishing antifriction treatment by a known method is by turning the brass rod with a diameter of 4 mm around its axis and the proposed method. The sample was pre-besirevic ethyl alcohol. Technological environment in both cases is the same: one part glycerin and three parts of 10% hydrochloric acid. Surface treatment in both cases is the same - 1 cm²the processing time is also the same. The calculated specific pressure brass rod on the sample when it is brass by known techniques was created using a calibrated spring that is built into a special device to the drilling machine. Figures 1 and 2 (increase ×350) shown pictures of the cover.

As you can see from the photos, the porosity of the coating obtained by the proposed method significantly less.

The source of information

1. Andreev, A.G., and other non-abrasive Finishing antifriction treatment as a means of increasing service life of machines and equipment. // The friction durability of machine parts: Collection of scientific. articles. Vol. No. 4 / Under. General Ed. Dunharrow. - M.: Mashinostroenie, 1990. - S. 34-59.

The way the finish anti-friction treatment, including rubbing of the friction surface copper-containing article is minem in the fluid characterized in that conduct percussive rubbing the surface with impact energy of 0.5 - 0.7 j and the angle of the rod to the treated surface 45 -60° in different directions.