Method of machining of the friction block detail working surface for giving to it

FIELD: mechanical engineering industry; other industries; methods of machining of the working surfaces of the friction blocks details for giving- to them the wear-resistant and antifriction properties.

SUBSTANCE: invention is pertaining to mechanical engineering and may be used at manufacture of the new and restoration of the worn-out blocks of the friction of different machines and mechanisms. The surface protecting coating is gained by its electric-spark alloying using the copper-based electrode. Grind the coating with removal of 10-30 % of the coating thickness, then the latter is passivated in the solution of oxidizer- and dried. On the worked surface apply the composition containing- the following components (in mass %): copper - 4-12, polytetrafluoroethylene - 2-8, glycol borate - 2-8, the soap plastic lubricant - the rest. The indicated - composition is periodically additionally applied in the operational mode of friction block. Before passivation the coating is rubbed with the stuff on the basis of copper at the pressure on the coating of 50-120 MPa, at the staff motion speed on the working surface of 0.01-0.10 m/s, in the medium consisting of the mixture of glycerin with the copper chloride taken in the ratio from 97:3 up to 99:1 mass %. The given working of the detail surface allows to improve the antiwear and - antifriction properties of the block of friction.

EFFECT: invention ensures the increase of the antiwear and - antifriction properties of the block of friction.

3 cl, 1 tbl, 1 ex

 

The invention relates to mechanical engineering and can be used in manufacturing new and restoring of worn friction of various machines and mechanisms.

A method of processing a working surface of the friction to make it wear-resistant and anti-friction properties, including the creation of a protective surface coating by electro-spark alloying [1] - prototype. The known method increases the wear and friction properties of friction sufficiently that does not provide the desired duration of the lifetime of the node.

Achieved by the invention is to increase the duration of the service life of the friction by increasing its antiwear and antifriction properties.

This result is ensured by the fact that in the known method of machining the working surface of the friction to make it wear-resistant and anti-friction properties, including the creation of a protective surface coating by electro-spark alloying, electrospark alloying is performed with the electrode made of a material based on copper, followed by grinding with the removal of 10-30% of the thickness of the coating, passivation in the oxidizer solution and drying, after which the treated surface is applied a composition comprising, in wt.%:

copper4-12
polytetrafluoroethylene (PTFE)2-8
the glycol borate2-8
soap greasethe rest is up to 100

Thus, before passivation, it is advisable to create an additional layer of protective coating electrical discharge floor grate material based on copper when the pressure on the floor 50-120 MPa, the speed of movement of the material on the treated surface of 0.01-0.10 m/s in the medium of a mixture of glycerol and chloride of copper, taken in the ratio of from 97:3 to 99:1.

Applied to the treated surface after drying and passivation composition periodic additionally apply to this surface in the mode of operation of the friction.

The grinding operation is necessary to create optimal from the point of view of achieving a high wear-resistant and anti-friction properties of the friction ratio between the square cut of the tops of the asperities of the primary coating after sanding and the area of the depressions between the cut vertex.

It was experimentally established that during the removal of less than 10% of the thickness of electrospark coatings due to the high specific contact pressure bearing capacity of friction and wear resistance will be small. When removing more than 30% of the thickness of elektroiskrovogo the coating wear resistance of the friction will be small due to the significant increase friction.

The coating compositions of the specified structure after passivation and drying, as well as in the mode of operation of the friction necessary for the implementation of the interaction between high-tension coating and the specified composition. Interaction occurs when the friction lies in the ability composition of the composition of regenerating the floor in the most loaded areas of frictional contact details of the friction.

The method according to the invention is as follows. First on the working surface of the friction spark doping coated electrode made of a material based on copper. The electrode may be performed, for example, by hot pressing of a mixture of powders of copper, lead, PTFE and molybdenum disulfide. The process is carried out on standard equipment under the following conditions: open circuit voltage or the voltage at the working electrode 10-200 V, short circuit current and operating current of 0.5-10 a, the energy of the pulsed discharge of 0.3-0.7 j, a current pulse of 0.05 to 1.5 kA, pulse duration 10-6-10-3with specific processing time of 1.0 to 3.5 min/cm2the frequency of rotation of the electrode (4-6)·103rpm Then the floor is polished, taking 10-30% of the thickness of the applied layer. After that, to further improve the wear properties of the coating over osnovnoj the (spark) coating is applied an additional coating by rubbing electrospark coating material based on copper under pressure to stem 50-120 MPa, the speed of movement of the material on the treated surface of 0.01-0.10 m/s in the medium of a mixture of glycerol and chloride of copper, taken in the ratio of from 97:3 to 99:1.

The rubbing of the coating material based on copper can be carried out using tool, comprising a housing with a spring-loaded clamp copper rod. The fixture is mounted in a tool holder of a lathe and the workpiece in the Chuck of the machine.

After grinding the surface of the part Passepartout and dried. If during processing, use rubbing to create additional coating, passivation and drying is performed after rubbing. In all cases, after passivation and drying, as well as periodically (preferably once every six months) during operation of the friction on the surface of the machined workpiece is applied a composition containing 4-12% copper, 2-8% PTFE and 2-8% of the glycol borate in plastic soap grease.

Example. Was carried out processing of internal working surfaces 8 batches of steel bushings bearings (8 bushings in the party) by the method according to the prototype (option 1), according to the invention without the use of rubbing spark coating (option 2) and using rubbing, including within the stated intervals of parameters rubbing (options 3, 4, 5) and outside the specified parameters (variations is you 6, 7).

When electrospark alloying on all sleeve was coated with bronze Brams 10-3-1,5.

Comparative efficacy of treatment bushings were determined by the intensity of their wear, the average coefficient of friction during the tests and the way of friction to achieve the preset values of the coefficient of friction equal to 0.22. The test results are placed in the table below.

Name basic operationsImplementation option
1234567
1. Electrospark alloying with:
- the voltage on the electrodes, In105105101052001300
- short-circuit current and operating current, And5,25,20,55,210,00,114,8
- energy pulsed discharge, J.0,50,50,30,50,70,10,9
- current pulse, kA 0,780,780,050,781,50,012,22
- specific processing time, min/cm22,22,21,02,23,50,14,8
the rotational speed of the electrode, n×103rpm5545637
- pulse width,10-410-410-610-410-310-710-2
- grinding with the removal % of the applied layer-20102030140
2. Rubbing electrospark coating material based on copper when:
- pressure on the rod, MPa--508512015155
- speed movements RUB the material, m/s --0,010,050,100,0010,15
- in the mixture composition (glycerol: chloride copper)--99:198:297:3of 99.5:0.5 to96:4
3. The coating composition of composition, wt.%:
- copper-84812116
- PTFE-5258111
- glycol borate-5258111
- soap greases tsiatim-201100829282729762
4. Test results:
- coating thickness, microns (after ZIL)9090120907022050
- intensively the th wear IG(mg/km12,910,33,03,13,2the 9.710,0
The average coefficient of friction, f0,200,170,110,110,110,170,17
- the way of friction, LTrto f=0,22, m385447865866867440442

Thus, the method according to the invention in comparison with the prototype provides particularly recommended intervals technological parameters significantly smaller values of intensity of wear of the friction and the average coefficient of friction, and significantly more important the way of friction to achieve a coefficient of friction equal to a specified value. Outside the intervals recommended settings characteristics of the friction worse, staying with the better of the relevant characteristics of the prototype method [1].

The source of information

1. Electrospark alloying metal surfaces. Edited UNITRODE, Kishinev, shtiintsa, 1985, p.42-43

1. The method of processing the working surface of the friction to come is of her wear-resistant and anti-friction properties, includes a protective surface coating by electro-spark alloying, characterized in that the electric-spark alloying is performed with the electrode made of a material based on copper, followed by grinding with the removal of 10-30% of the thickness of the coating, passivation in the oxidizer solution and drying, after which the treated surface is applied a composition comprising, in wt.%:

copper4-12
polytetrafluoroethylene2-8
the glycol borate2-8
soap greasethe rest is up to 100

2. The method according to claim 1, characterized in that before passivation coating RUB the material based on copper when the pressure on the floor 50-120 MPa, the speed of movement of the material on the treated surface of 0.01-0.10 m/s in the medium of a mixture of glycerol and chloride of copper, taken in the ratio of from 97:3 to 99:1 wt.%.

3. The method according to claim 1 or 2, characterized in that the specified composition periodically in addition put in a mode of operation of the friction.



 

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