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Method of friction brassing of friction surfaces

IPC classes for russian patent Method of friction brassing of friction surfaces (RU 2258096):

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

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FIELD: technology of finish treatment of precision friction pairs, mainly bodies of revolution, for example plug gauges, fuel equipment plungers, injector atomizers.

SUBSTANCE: proposed method includes degreasing, application of technological fluid and friction brassing. Prior to friction brassing, friction surfaces are subjected to abrasive jet treatment at total rate of abrasive flow of 0.06 to 0.07 g/mm². As a result, obtaining of copper-containing film on friction surfaces is guaranteed at Ra≤0.04 mcm.

EFFECT: enhanced efficiency.

2 cl, 2 dwg

The invention relates to the technology of finishing precision of friction pairs, mostly revolving bodies require high processing quality and accurate dimensions, for example, pass-through plugs, gauges for measuring accurate holes (tolerance of a few microns), plungers, fuel equipment, needle spray nozzles of diesel engines, chassis screw machine tools, such as gamma milling machines VM 133, valves for the oil and gas industry.

There is a method of abrasive machining of surfaces of the parts [1], comprising applying to the surface of the workpiece with the abrasive size abrasive particles 0.5 and 10 microns and a speed of 30 m/S.

The disadvantage of analogue is that the issues of preservation of the original surface roughness of the workpiece and the original size it does not are not solved. In the example No. 1 analogue (removing old paint - epoxy enamel EP-140 with the removable parts of the airframe) indicated that the original thickness of the anodized film (30 μm) decreased by 5 μm. The latter circumstance is reducing the size of the workpiece during jet-abrasive machining is totally unacceptable for precision parts friction pairs, as, for example, radial working gap of the nozzle diesel engine ″KAMAZ″ must be equal to 2 μm, while for the ora 4 μm operational characteristics of the spray significantly worse.

As the prototype was taken way friction brass plating [2], which includes the operation of jet-abrasive machining of the friction surface of the abrasive, the subsequent degreasing, coating. The disadvantage is that its implementation is possible at Ra>0,04 µm. Experiments conducted by the author showed that, starting with Ra<0.1 ám, the process of friction brass plating becomes unstable due to the fact that the tops of the asperities is too smooth and brass not "catch". On laconium details there are areas where brass no, the film thickness of the brass becomes variable. The increase in surface pressure brass rod in excess of the pressure values specified in the analogue leads to the replacement of the diffusion process of rubbing the brass in the steel surface to its smearing on the friction surface. The thickness of the coating brass is increased, and its adhesion to the metal surface friction decreases.

The technical problem faced by the author, is the ability to guarantee copper-containing film on the friction surfaces at Ra≤0,04 ám.

The technical result is achieved by the fact that in the known method, comprising operations of their degreasing, applying the process liquid and the operation of the friction brass plating, before friction is the brass make their jet-abrasive processing with the total abrasive flow rate per unit surface area of the workpiece 0,07 0,06...g/mm ².

Figure 1 presents profilogram surfaces, obtained by different treatments. Figure 2 - experimental data on the change in size of the parts due to the influx of metal at the edges of the holes formed by the impact of abrasive grains on the surface (surface friction).

1 - abrasive-grain M5 (grain size 3...5 µm)

2 - the abrasive grain M40 (the size of the abrasive 28...40 μm).

The surface to be brass, subjected to degreasing, for example, gasoline. Then it is applied the process liquid and next is the actual process of friction brass plating, the modes are in the similar [2]. When rubbing the surface friction of brass (bronze) is the process of microtune, particles brass rubbed into the surface friction. The thickness of the formed film brass is not more than 0.5 μm.

The proposed method was used for friction brass plating work surfaces flow gauges-plugs. The surface roughness of the working part of a caliber equal to Ra=of 0.01-0.02 mm. Sustainable film brass was formed after 3 passages of the brass rod L on the part surface. Friction brass was carried out on the device, which is provided in analog. Item (tube-caliber) is secured in the Chuck of a lathe, lighting Sobranie - in his support. Jet-abrasive machining of the friction surfaces before friction brass was carried out on a special stand, which was a pneumatic nozzle with a supply of abrasive M5, item (tube-caliber) is rotated with the electric motor DC. The treatment was carried out up until the working surface of the gauge-tube does not become visually homogeneous matte. Audit records of profilogram surface before and after the jet-abrasive machining allowed to select the modes of the jet of blasting that do not change the average height of the roughness and the diameter of the part. These modes are the following: the speed of the shot particles 30...50 m/s, the angle between the axes of the nozzles and parts 90°, the total flow of abrasive per 1 mm²the workpiece 0,07 0,06...g/mm².

The impact velocity of the particles in the range of 30...50 m/s is selected from the following considerations. Experimental studies have shown that when impact velocity is less than 25 m/s abrasive M5 has no significant impact on the surface of hardened steel (HRC60) for acceptable from the point of view of the organization of the technological process, the processing time. When impact velocity of abrasive particles greater than 50 m/s, the surface roughness increases. The impact velocity of the particles was assumed to be equal to the air velocity in the zone of its contact the workpiece surface. The last assumption is justified, because at small sizes of abrasive particles (δ=1...5 µm) particle velocity close to the speed of the air. Air velocity was measured tube full pressure (Pitot tube), simultaneously measured air flow using variable area flowmeters brand RS-5.

Figure 2. shows the variation in the dimensions of the part in a jet-abrasive processing depending on the total consumption of abrasive per 1 mm²the workpiece for the two abrasives: M5 and M40. Size measurement details (needle spray nozzle) was produced spring measuring head type 01 IGPU with a multiplier of 0.1 μm, GOST 6933-81. In the initial processing, the size was increased due to the influx of the metal at the edges of the holes formed by the impact of abrasive grains on the surface. Further, increasing the total amount of abrasive per 1 mm²processing, the size of the part was reduced and abrasive M5 in the flow range of the abrasive G=0,07 0,06...g/mm²the detail size was equal to the original and in the further processing decreased. The processing time is determined by the flow of abrasive. The height of the roughness remains unchanged. With increasing size of the abrasive grain height of the corrugation of the metal at the edges of the hole increases, the size of the part increases more, and then decreases. The amount of the hydrated abrasive flow rate, when the workpiece is returned to the source, also increases. As an example, figure 2. see curve 2 for abrasive M40. When the total flow rate of the abrasive G=0.1 g/mm²the size of the part is returned to the original, which was before the jet-abrasive processing.

Durability calibers after the friction of the brass plating on the proposed method increases 1.3...1.5 times.

Thus, a new set of essential features, namely the introduction of the operation of the jet-abrasive processing modes with a total flow rate of the abrasive M5 per unit surface area of the workpiece 0,07 0,06...g/mm²allows you to create the desired microrelief without changing the size of the workpiece.

Sources of information

1. A.S. No. 852518. The method of cleaning surfaces of the parts/Vavilov CENTURIES, Gerlivanova VG, Grachev R.A., etc./Russia//B. I. - 1981. No. 29.

2. 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. - P.34-59.

The way the friction of the brass plating of the friction surface, which includes the operation of jet-abrasive machining of the friction surface of the abrasive, the subsequent degreasing, coating technology, it is the policy of the liquid and the operation of the friction brass plating, characterized in that the total flow of abrasive per unit surface area of the workpiece during jet-abrasive processing is 0.06 - 0.07 g/mm².