SU1613727A1 - Method of working parts of friction assembly - Google Patents

Abstract

The invention relates to mechanical engineering and can be used to increase the wear resistance of the friction units and speed up their burn-in process. The purpose of the invention is to reduce the processing time without changing the wear resistance. Details of the friction unit are immersed in an etching composition. Ultrasonic vibrations with a frequency of 0.02-1.0 MHz are excited in it for 30-50 s, washed from the etching composition and neutralized. Then the parts are immersed in a lubricant, which is intended to lubricate this unit in operation, and excite in it ultrasonic vibrations with a frequency of 0.02-1.0 MGP for 10-40 minutes. For steel parts, a 2-24% solution of phosphoric acid is used as the composition for etching, and for parts made of copper alloys the composition is used: perchloric acid (density 1.2 g. Cm ² ) 180-220 ml / l, glycerin 90- 110 ml / l, ethyl alcohol (96%) the rest is up to 1 l. 2 hp f-ly, 1 tab. 6 Il.

Description

 The invention relates to mechanical engineering, in particular to methods for reducing wear of friction units, and can be used to increase the wear resistance of friction units and speed up their burn-in process.

The purpose of the invention is to reduce the processing time without changing the wear resistance of the friction unit.

The method of machining the parts is WTO, that the parts of the friction unit are pre-immersed in the etching composition, excite ultrasonic vibrations at a frequency of 0.02-1.0 MHz within 30-50 seconds. washed from this composition and neutralized, then the parts are immersed in a lubricant, excite in it ultrasonic vibrations with a frequency of 0.02-1.0 MHz and incubate for 10-40 minutes. and the lubricant is selected from the group of those. which are intended for lubrication of this friction unit during operation. When machining steel parts, a 2.0-24.0% phosphoric acid solution is used as an etching compound, and when machining parts made of copper alloys, the composition is used in the following ratio of components, ml / l; Perchloric acid (density: 2 g / cmТ 180-220 Glycerin90-110

Ethyl alcoholUp to 1 l

FIG. 1 shows a diagram of an apparatus for carrying out the method: FIG. 2-5 show the nature of the dependence of the treatment time in the composition for etching on the concentration of phosphoric acid, the content of perchloric acid, glycerin, and the vibration frequency of ultrasound, respectively: FIG. 6 - the dependence of the processing time in

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fO

lubricant From the frequency of ultrasonic vibrations ...

A device for carrying out the method of squeezing an ultrasonic generator 1 of a traction bath 2 and a generator 3 of a working bath 4, associated with them respectively with its inputs ultrasonic piezoelectric transducers with ultrasonic concentrators 5, introduced into baths 2 and 4. In baths 2 and 4 containing respectively, the etching composition 6 and the working lubricant 7, the workpiece 8 or several workpieces are sequentially located.

The method carried out (from as follows.

The parts of the friction unit are immersed in a bath 2 with composition 6 for etching and excite in it ultrasonic vibrations with a frequency of 0.02-1.0 MHz by the generator 1 for 30-50 seconds. Then the parts are removed from the bath 2. washed from the composition for etching and neutralized, for example, in a 0.3-0.5% solution of caustic soda at 25-30 ° C for 30-50 s. After that, the working surfaces of the parts of the friction unit are immersed in a bath 4 with a lubricant 7. Selected from the group of those that are intended to lubricate the friction unit in operation, ultrasonic vibrations in it with a frequency of 0.02-1.0 MHz are excited in it. min. After the end of the treatment, the ultrasonic generator 3 is turned off and the part is removed from the bath A. In this bath it is possible to simultaneously process the bronze and the rest of the parts. When performing the etching operation, a 2.0-24.0% solution of phosphoric acid is used, and for parts made of copper alloys, the composition, ml / l is used:

Perchloric acid

(density 1.2 g / cm 180-220

Glycerin90-110

Ethanol

(96%) Up to 1 l

The need for operational parameters has been established experimentally. Thus, the concentration of phosphoric acid in the etching solution for steel parts less than 2.0 and more than 24.0% does not allow to achieve the desired effect, since the processing time in the solution for etching significantly increases (Fig. 2).

Perchloric acid content is less than 180 and more than 220 ml / l and glycerol 1 less than 90 and more than 110 ml / l in etching solution and parts made of copper alloys are not useful, since the treatment time in the solution, and I: mp. zleka significantly increased (Fig, 3, 4).

The frequency of ultrasonic vibrations when processing parts in etching solutions and a lubricant less than 0.02 MHz is also impractical because the processing time increases significantly (Fig. 5). When the oscillation frequency is more than 1 MHz, a significant attenuation of the ultrasonic signal occurs when passing through the medium ,,,

The practical application of the proposed method is illustrated by the following examples (see table), in which the details of the friction unit (shoe and roller) were processed according to the prototype method (example 1), according to the proposed method (examples 3-5) and 15 Sobam, the parameters of which went beyond the limits in a lower direction (example 2) and in a larger direction (example 6). Tests to determine the time of running-in and wear rate 20 were carried out on the SMC-2 friction machine according to the block-roller scheme under the same conditions for all methods: rotation frequency 1000 rpm, load 2500 N. The lubricant CIATIM-201 was used. A co-25 boat was made of BROTS 5-5-5 bronze, and the roller was made of steel 45, followed by quenching for maximum hardness. The tests were carried out for 10 hours (600 minutes). During tests of the prototype method (Example 1) 0, ultrasonic vibrations were excited in the lubricant over the entire test time (600 minutes). When testing parts treated according to examples 2-5, ultrasonic vibrations were not excited. Parts treated according to Example 6 were not tested, since their surface had great damage after treatment in the etching composition. The run-in time is determined by the stabilization of the friction time. The amount of wear was determined by measuring the thickness of the block before and after the test.

The proposed method, compared with the method of the prototype, reduces the processing time by 14.4-54.5 times with the same wear resistance of the friction unit.

Formula of the Invention 1. A method for processing parts of a friction unit, in which parts are placed in a lubricant, excites ultrasonic vibrations in a lubricant and maintains parts in it which is different in that it is wear-resistant to reduce processing time - 5 steps of the friction unit, the parts are pre-immersed in the etching composition, excitation in it of ultrasonic vibrations with a frequency of 0.02-1.0 MHz, held for 30-50 s, after which the parts are washed and kept in solution to neutralize , and detail exposure it is carried out in a lubricant for 10-40 minutes with a frequency of ultrasonic vibrations of 0.02-1.0 MHz, and the lubricant is selected from the group of materials intended for lubricating the friction unit during operation.

2. A method according to claim 1, characterized in that, when processing steel parts, a 2-24% phosphoric acid solution is used as an etching composition.

3. A method according to claim 1, characterized in that, when processing parts from copper alloys, a composition containing perchloric acid with a density of 1.2 g / cm is used as an etching compound. glycerin and 96% ethyl alcohol, in the following ratio of components, ml / l;

Perchlornic acid180-220

Glycerin90-110

Ethyl alcoholUp to 1 l

Note; - destruction of the surface immediately after the start of treatment according to example b in the composition for etching.

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180 200 2 20 C, g / l Content nsuts Fi2.3

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Claims (3)

Claim 1. A method of processing parts of a friction unit, in which the parts are placed in a lubricant, excite ultrasonic vibrations in the lubricant and withstand parts in it, characterized in that, in order to reduce processing time without changing the wear resistance of the friction unit, the parts are pre-immersed in the composition for etching, they excite ultrasonic vibrations in it with a frequency of 0.02-1.0 MHz, stand for 30-50 s, after which the parts are washed and kept in a solution for neutralization, and the exposure of parts in a lubricant was estvlyayut for 1040 minutes at a frequency of ultrasonic vibrations 0,02-1,0 MHz, wherein the lubricant is selected from the group materi- 5 aloe intended for lubrication of the friction assembly during operation. 2. The method of pop. 1, characterized in that when processing steel parts as a composition for etching using 10 2-24% solution of phosphoric acid. 3. The method of pop. 1, characterized in that when processing parts from copper alloys as a composition for etching using a composition containing perchloric acid with a density of 1.2 g / cm ² , glycerin and 96% ethyl alcohol, in the following ratio, ml / l : Perchloric acid 180-220 Glycerol 90-110 Ethanol Up to 1 liter Compositions, operations and their parameters Example No. 1 2 3 4 5 6 Steel parts are immersed in a solution of phosphoric acid with a concentration,% 0.5 2.0 13.0 24.0 35.0 Parts of copper alloys are immersed in a composition containing. ml / l: Perchloric acid 160 180 200 220 240 Glycerol - 80 90 100 110 120 Ethanol 760 730 700 670 640 Excitation in a solution of ultrasonic vibrations with a frequency, kHz • 18 20 510 1000 1100 They are washed, neutralized, immersed in a lubricant and excite ultrasonic vibrations in it with a frequency, kHz 18 18 20 510 1000 1100 Processing time in the composition for etching, s: Steel part 71 fifty thirty 48 * Copper alloy part - 71 fifty thirty 48 ★ Processing time in the lubricant, min 600 80 40 10 35 Total processing time, min 600 82,4 41.7 11.0 36.6 - Break-in time after treatment, min 6 10 5 6 6 - Wear rate during operation lh · 10 ' ⁸ 2.2 5,4 2.1 2.2 2.2 - Note: the destruction of the surface immediately after the start of processing according to example 6 in the composition for etching. Concentration n ₃ P0c Figure 2 Content nsuts Fig.Z Processing Time Processing Time Glycerol content FIG. 5 Fig 6