The method of coating the surface friction
(57) Abstract:The invention relates to mechanical engineering, in particular to the technology of applying a solid lubricant coatings with ultrasound. The method of coating the surface friction is that the coating is applied by rubbing in pseudocyesis layer of powder of a solid lubricant, and the lubricant particles reported oscillations of ultrasonic frequency, oriented relative to RUB the surface in radial and tangential directions. 2 Il. The invention relates to mechanical engineering, in particular to the technology of applying a solid lubricant coatings of the type of graphite or molybdenum disulfide on the friction surface of the cylindrical parts like shaft, and can be used in all cases when you want to apply the coating in the form of dry powder on the surface subjected to wear.Known method of applying a solid lubricant on the metal surface friction by rubbing them with a powder of molybdenum disulfide, molybdenum diselenide, graphite, etc. and RUB the surface may be covered with a sublayer of fusible metal.Known method of applying a solid lubricant on the metal in the cation excess lubricant mixture.Closest to the claimed is a method of obtaining anti-friction coatings by rubbing the metal surface with molybdenum disulfide carried out in an atmosphere of ammonia.However, the known methods do not provide high durability of the coating due to the poor adhesion to the treated surfaces, or require special expensive equipment vacuum chambers.The task of the invention is to improve durability of the coating for improving the adhesion with the surface.This object is achieved in that the rubbing surface is carried out in pseudocyesis layer of powder of a solid lubricant, and the lubricant particles reported oscillations of ultrasonic frequency, oriented towards RUB the surface in radial and tangential directions.In Fig. 1 and 2 shows the scheme of the device for implementing the inventive method.The workpiece 1 (cylindrical shaft surface) contacts in the implementation of the method with tool elastic metal strip 2, which surface in the zone of contact with the workpiece rigidly connected with the frame 3 of innocore 4, which in turn is connected with the ultrasonic transducer 5, supplied from the ultrasonic generator (ultrasonic generator-10, not shown in the figure). Solid lubricant in powder form is fed to the fence and zahvatyvali rotating the part 1, is moved into the working area.As the elastic tape 2 is rigidly connected to the ultrasonic concentrate 4, when it is stretched and compressed by the value of the amplitude of the end face of the hub (30 to 50 μm) with ultrasonic frequency. In the particles of the lubricant 6 in contact with the tape 2, receive pulses of oscillations of two types of S1and S2oriented with respect to the treated surface radially S1and tangentially S2. The appearance of the pulses S2caused by the lengthening and shortening of the belt, and pulses S1the fact that the lengthening and shortening of the tape with the lesser and greater force compresses the pad 3, thereby the tape 2 is approaching, moving away from the treated surface 1. The pulses follow with ultrasonic frequency, activating particles of grease. Creates pseudocyesis layer in which particles of grease under the influence of impulses S1effectively penetrate into all the microscopic irregularities of the surface details. This is the result in contact with the material of the lining 3. Particles of grease, captured by the movement of rotation of the parts involved in the V-gap and distributed across the treated surface. When this happens the effective desapareceu of asperities of the surface of the part, which was not provided with the first processing stage, as the pulses S2significantly accelerate the process of rubbing, while the pulses S1prevent the phenomenon of arching grease over the asperities. Plate 3 together with the tape 2 perform an oscillating movement of the ultrasonic frequency, which makes the rubbing process is particularly effective, providing high-quality adhesion and, as a consequence, increasing the durability of the coating. The method of coating the surface of the cylindrical parts by rubbing the surface, characterized in that the rubbing is carried out in pseudocyesis layer of powder of a solid lubricant, and the lubricant particles reported oscillations of ultrasonic frequency, oriented relative to RUB the surface in radial and tangential directions.
FIELD: machine engineering, namely manufacture of three-dimensional cermet articles, possibly in stomatology for making dentures.
SUBSTANCE: process comprises steps of applying ceramic mass with thickness more than 50 micrometers onto surface of stainless steel or alloy; performing sintering in air in quasi-homogenous electromagnetic field at presence of electric and magnetic components of SHF electromagnetic irradiation. Frequency range 1 -30 GHz; amplitude of electric field E0 is in range 400 -1600 V/cm. Amplitude of magnetic field H0 is in range 0.8 - 3.5 A/cm. Maximum temperature of sintering is in range 800 - 1100° C.
EFFECT: enhanced adhesion of materials, possibility for joining materials in atmosphere at standard pressure.
5 cl, 2 dwg, 3 tbl, 2 ex
FIELD: plastic working of metals, possibly manufacture of laminate articles such as sleeves, namely for fuel elements of nuclear reactors.
SUBSTANCE: method comprises steps of assembling blank of core and blank of envelope; applying lubricant onto surface of built-up blank; sizing built-up blank by deforming its pipe branches at necking walls; beading; welding beaded end of built-up blank and subjecting it to thermal diffusion treatment; after beading drying built-up blank while selecting minimum temperature of drying no less than ignition temperature of the most viscous oil in composition of lubricant used at sizing blank and selecting maximum temperature of drying no more than recrystallization temperature of material of envelope of laminate article.
EFFECT: lowered degree of gas saturation of articles, reduced number of articles rejected by swollen zones due to providing evaporation of lubricant penetrated in built-up blank and separation of gaseous evaporation products to outside.
FIELD: production of anti-friction self-lubricating materials, possibly used in machine engineering, aircraft making, instrument making, chemical and other industry branches for making dry friction assemblies.
SUBSTANCE: method comprises steps of preliminarily bronzing plate of low carbon steel; scorching bronze-brass gauze in sealed container; filing pores of scorched gauze with fluoroplastic composition and sintering it. Bronze powder for bronzing plates are prepared by heating copper and tin mixture under coal charge in sealed container. Low carbon steel plates are preliminarily bronzed due to scorching and fusing prepared bronze powder. Gauze pores are filled (by pressing-in) with powder charge containing fluoroplast-4 and lead. Then plate surface non-protected by means of fluoroplast composition is aluminized due to applying layer of dust aluminum through layer of phosphoric acid. Sintering is performed in air under pressure created due to expansion of fluoroplast-4.
EFFECT: simplified manufacturing process, improved properties of material.
FIELD: production of bimetallic anti-friction materials, namely processes for sintering powder systems, possibly in machine engineering for making friction assemblies and retainers of rolling bearings.
SUBSTANCE: process comprises steps of bronzing sheet of low-carbon steel; sintering to it bronze-brass gauze and filling its pores with PTFE; simultaneously performing bronzing of low-carbon steel and scorching of bronze-brass gauze to bronzed steel in sealed container at temperature 850 - 860°C; filling pores of gauze with bronze powder and subjecting semi-finished material to heat treatment in sealed container at temperature 880 - 900°C; filling pores of bronze layer with ultra-finely divided PTFE by rubbing and then rolling material between rollers.
EFFECT: simplified manufacturing process, improved technical properties of material.
FIELD: powder metallurgy, namely production of antifriction layer of sliding bearing assemblies, possibly manufacture of bearing assemblies of submerged electrically driven pumps.
SUBSTANCE: method comprises steps of working base of bearing till roughness degree 320 - 160 micrometers; placing antifriction material onto worked surface and inserting it into furnace; then soaking it in furnace in protection-reduction medium at first at temperature lower than melting temperature of antifriction material till complete reduction of oxides on surface and then at melting temperature of antifriction material. Then cooling is realized at crystallization from downwards to upwards.
EFFECT: improved quality of bearing assembly.
5 cl, 3 dwg