Method of manufacturing of part of wear-resistant and antifriction coating

FIELD: machine building.

SUBSTANCE: preliminary a rod is made by pressing and sintering of the composition containing copper powder, PTFE powder and ammonium chloride. To the work surface of the part a composition is applied containing 1…3 wt % of copper chloride in glycerine. Then the rod is put in friction contact with the work surface of the part with sliding speed 0.06…0.09 m/s at longitudinal feed rate 50…80 mcm/rev, pressure 30…50 MPa, and number of passes 4…6. The obtained coating is passivated, then lubricating composition based on soap plastic lubricant comprising copper powder and PTFE powder is applied. At that prior to the lubricating composition application it is preliminary heat treated in inert gas by pressing-through 3…5 times under pressure via the gap between external and internal cages of the heated and installed in series roll bearings.

EFFECT: increased antiwear properties of the coating and antifriction properties upon increased durability of the coating.

1 tbl

 

The use of

The invention relates to mechanical engineering and can be used for the manufacture of parts with wear resistant and anti-friction coating on the working surfaces of friction units.

The level of technology

A method of producing a wear-resistant coating on the working surfaces by chemical copper plating of their working surfaces (SU, copyright certificate №1579936, IPC C23C 18/38, 1988 [1]). However, the coating has insufficient durability and wear after this coverage begins intensive wear of the base material of the part.

Known also adopted as the closest analogue of the method of manufacturing parts with wear-resistant and antifriction coating, including prefabrication of the rod of the coating material, bringing it into frictional contact with the working surface in the presence of technological structure, the passivation of the coating subsequently applied to the lubricant composition based on soap grease comprising powders of copper, lead and polytetrafluoroethylene (SU, copyright certificate №1456283, IPC B22F 7/04, 1986 [2]). The use of this method improves the antiwear and antifriction properties of the coating, however, it has insufficient durability.

Disclosure of the invention

The technical problem of�of bretania is to further increase the anti-wear and anti-friction properties of the coating and increase its durability.

To achieve these objectives in the method of manufacturing parts with wear-resistant and anti-friction coating, comprising the preliminary manufacture of the rod by pressing and sintering a composition comprising 87...92 wt.% of copper powder, 6...10 wt.% powder of polytetrafluoroethylene, 2...3 wt.% ammonium chloride, applying to the working surface of the part composition containing 1...3 wt.% copper chloride in glycerol, the cast rod in frictional contact with the working surface of the part at a sliding velocity of 0.06...0.09 m/s, longitudinal feed 50...80 µm/Rev, a pressure of 30 to 50 MPa and the number of passes 4 6..., passivation of the coating subsequently applied to the lubricant composition based on soap grease comprising from 10 to 15 wt.% of copper powder and 2...5 wt.% the polytetrafluoroethylene powder according to the invention before applying the lubricating composition to pre-thermoablative in the atmosphere of inert gas by forcing 3...5 times under pressure N=(0,01 0,07...) MPa with a flow rate G=(0,01 0,20...) kg/min through the gap between the outer and inner cages are heated to a temperature of t°=(0,5...0,7)t°Kconsecutive rolling bearings, the number of which is n=7...9, rotating with frequency W=(0,01 0,03...) WEXTto which is applied a pressure P=n(0,60 0,06...) QEXTwhere QEXT- the maximum allowable static load�and one bearing, t°K- temperature dropping point of lubricating compositions, WEXT- the maximum allowable rotational speed of the bearings.

Management of some technological processes in the atmosphere of inert gas in itself known. However, none of the known methods for the heat treatment of the lubricating composition, used to produce wear-resistant and antifriction coating is not carried out in an inert gas atmosphere, i.e., in the proposed method, this sign shows the new property - extends the range of application of the known method.

The known applicant sources some General properties of signs "heated to a temperature of t°=(0,5...0,7)t°Kand rotating with frequency W=(0,01 0,03...) Wsupplementary.to which is applied a pressure P=n(0,60 0,06...) QEXT"known, for example, from the patent SU # 1196552, IPC F16C 33/66, 1984 [3], in which during the processing of a bearing prior to operation between the working surfaces of the bearing inject grease composition, the bearing rotates with frequency W1=(0,01 0,03...) WEXTwithin 12...20 min, heated to a temperature of t°=(0,5...0,7)t°Kthen increase the speed to W2=(0,07 0,05...) Wsupplementary.and rotates with the frequency within 5...8 min is applied to the bearing pressure P=(0,60 0,06...) QEXTand rotate under these conditions for 2...3 hours. The proposed� the way this sign shows the new property - extends the range of application of the known method.

The use of signs "by forcing 3...5 times under pressure N=(0,01 0,07...) MPa with a flow rate G=(0,01 0,20...) kg/min, through the gap between the outer and inner cages and placed one rolling bearing, the number of which is n=7...9" other methods of obtaining anti-friction and wear-resistant coating according to published sources unknown.

Based on the above analysis, the claimed technical solution meets the criterion of "inventive step".

The applicant first identified in his research that after the proposed action lubricating composition it formed activated particles of the additive, the presence of which greatly intensifies the process of cladding by them rubbing surfaces of details of machines. This improves the antiwear and antifriction properties of the coating and increases its durability.

Detailed description of the invention

The method is as follows. At first produce a terminal by pressing and sintering a composition comprising 87...92 wt.% of copper powder, 6...10 wt.% powder of polytetrafluoroethylene and 2...3 wt.% ammonium chloride. On the working surface of the part is applied in a composition containing 1...3 wt.% copper chloride in glycerol and lead rod in frictional contact with the working �overhasty items at a sliding velocity of 0.06...0.09 m/s, longitudinal feed 50...80 µm/Rev, a pressure of 30 to 50 MPa and the number of passes 4 6..., after which the resulting coating passivate. The rubbing surface can be accomplished using a fixture, comprising a housing with a spring loaded retainer rod. The fixture is mounted, for example, in a tool holder of a lathe and the workpiece in the Chuck of the machine.

Then thermoablative lubricating composition. To do this, after pre-mixing soap grease with powders of copper and PTFE lubricant composition in the atmosphere of inert gas is forced 3...5 times under pressure N=(0,01 0,07...) MPa with a flow rate G=(0,01 0,20...) kg/min through the gap between the outer and inner cages (n=7...9 consecutive heated to a temperature t°=(0,5...0,7)t°Krolling bearings, rotating with frequency W=(0,01 0,03...) WEXTto which is applied a pressure P=n(0,60 0,06...) QEXTwhere t°K- temperature dropping point of lubricating compositions, WEXT- the maximum allowable rotational speed bearings, QEXT- the maximum allowable static load on one bearing.

Heat-treated lubricating composition is applied to the working surface of parts and assemble them in the friction node.

The practical application of the proposed method is illustrated by the following examples, which are the working surfaces of parts of the friction node processed by the proposed method and the method prototype [2], and also the ways in which the parameters of the operations were within the claimed limits.

Tribological test samples were determined on the test stand hinges on a "shaft-bushing". On shafts of steel ZOGGS struck glycerol containing 2 wt.% copper chloride, then rubbed them with a rod containing to 89.5 wt.% copper, 8 wt.% polytetrafluoroethylene (PTFE) and 2.5 wt.% ammonium chloride, at a pressure on the rod 40 MPa, sliding velocity of 0.08 m/s with a longitudinal feed 50...80 µm/Rev. for 5 passes. After coating the shafts were passivehouse in warmed up to 25°C a 0.5% solution of caustic soda. Bushings made of bronze Brams 10-3-1,5. A lubricating composition based on soap grease ciatim-201, containing 12 wt.% powder of copper and 3 wt.% powder of polytetrafluoroethylene, thermoablative on methods whose parameters are given in table 1 and were applied to the working surface of the shafts. For the test, the shaft is made reciprocating rotary motion with an amplitude of 15 mm and a frequency of 2 Hz. The specific pressure was 90 MPa, the base test 2 kilometers of friction. During the tests we measured the friction torque, and after testing, the wear rate of the bushing.

Testing the durability of the coating was carried out under the same conditions. Determined the way of friction to the bully, i.e. a sharp increase of the friction coefficient.

The results of tribological�such tests are also given in table 1. Notation: example 1 - treatment by the method-prototype [2], 2 and 6 - processing methods, the values of the parameters of the operations are less than (2) and (6) declared, 3, 4, 5 - treatment by the inventive method, the parameters of which lie on the bottom (3) and upper (5) declared the border and in the center (4) between the lower and upper bounds. Each value of intensity of wear process, are shown in table 1 obtained by calculating the arithmetic averages of the results 4...5 experiments.

Table 1
The conditions of implementation of the technical solution and the results of tribological tests
NameThe number of the example method
123456
Supply of inert gas into the chamber for processing--++++
Bearing heating to temperatures� t°/t° K-0,40,50,60,70,8
Aligning bearings in rotation with frequency W/WEXT-0,0050,010,020,030,04
Punching lubricating composition under pressure N, MPa-0,00050,010,040,070,10
with the consumption of G, kg/min-0,00050,010,10,200,30
Annex to the bearing pressure, P/nQEXT-0,010,060,330,600,93
Extrusion through the number of bearings n, NJ)- 678911
The number of times of hammering of the party-23456
The wear rate of the bushing, mg/km21,921,119,018,319,120,6
Coefficient of friction0,120,120,100,090,100,12
The way of friction to the bully, km2,62,74,25,54,22,8

Thus, in accordance with the results of tribological tests, the use of the claimed method in comparison with the prototype [2] improves the antiwear properties of the coating 15...20%, and anti-friction properties� 20...33% while increasing its durability in 1.6...2.1 times.

Method of manufacturing parts with wear-resistant and anti-friction coating, comprising: obtaining a terminal by pressing and sintering of his next composition containing, in wt.%: 87 92...of copper powder, 6...10 powder polytetrafluoroethylene, 2...3 ammonium chloride, applying to the working surface of the part composition containing 1...3 wt.% copper chloride in glycerol, the cast rod in frictional contact with the working surface of the part at a sliding velocity of 0.06...0.09 m/s for longitudinal feed 50...80 µm/Rev, a pressure of 30 to 50 MPa and the number of passes 4 6..., passivation of the coating with subsequent application of lubricating compositions based soap grease containing, in wt.%: 10...15 of copper powder and 2...5 powder of polytetrafluoroethylene, characterized in that before applying the lubricating composition to pre-thermoablative in the atmosphere of inert gas by forcing 3...5 times under pressure N=(0,01 0,07...) MPa with a flow rate G=(0,01 0,20...) kg/min through the gap between the outer and inner cages are heated to a temperature of t°=(0,5...0,7)t°Kconsecutive rolling bearing, the number of which is n=7...9, rotating with frequency W=(0,01 0,03...) WEXTto which is applied a pressure P=n(0,60 0,06...) QEXTwhere QEXT- the maximum allowable static load on one bearing, t°K- temp�tour dropping point of lubricating compositions, WEXT- the maximum allowable rotational speed of the bearings.



 

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