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  - 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.%:
|the glycol borate||2-8|
|soap grease||the 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 operations||Implementation option|
|1. Electrospark alloying with:|
|- the voltage on the electrodes, In||105||105||10||105||200||1||300|
|- short-circuit current and operating current, And||5,2||5,2||0,5||5,2||10,0||0,1||14,8|
|- energy pulsed discharge, J.||0,5||0,5||0,3||0,5||0,7||0,1||0,9|
|- current pulse, kA||0,78||0,78||0,05||0,78||1,5||0,01||2,22|
|- specific processing time, min/cm2||2,2||2,2||1,0||2,2||3,5||0,1||4,8|
|the rotational speed of the electrode, n×103rpm||5||5||4||5||6||3||7|
|- pulse width,||10-4||10-4||10-6||10-4||10-3||10-7||10-2|
|- grinding with the removal % of the applied layer||-||20||10||20||30||1||40|
|2. Rubbing electrospark coating material based on copper when:|
|- pressure on the rod, MPa||-||-||50||85||120||15||155|
|- speed movements RUB the material, m/s||-||-||0,01||0,05||0,10||0,001||0,15|
|- in the mixture composition (glycerol: chloride copper)||-||-||99:1||98:2||97:3||of 99.5:0.5 to||96:4|
|3. The coating composition of composition, wt.%:|
|- glycol borate||-||5||2||5||8||1||11|
|- soap greases tsiatim-201||100||82||92||82||72||97||62|
|4. Test results:|
|- coating thickness, microns (after ZIL)||90||90||120||90||70||220||50|
|- intensively the th wear IG(mg/km||12,9||10,3||3,0||3,1||3,2||the 9.7||10,0|
|The average coefficient of friction, f||0,20||0,17||0,11||0,11||0,11||0,17||0,17|
|- the way of friction, LTrto f=0,22, m||385||447||865||866||867||440||442|
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 .
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.%:
|the glycol borate||2-8|
|soap grease||the 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.
FIELD: production of cartridges of small arms of various designation, can be realized mainly for production steel cartridge cases of live cartridges of small arms.
SUBSTANCE: the steel cartridge case with a protective coating consists of successively applied layers: a zinc-phosphate layer in the form of a polymeric compound based on the polymer of polyorganosiloxane and the copolymer of butadiene with styrene and a polymer and/or oligomer modifying it, forming with the polyorganosiloxame of sale spatially joined structure of polymeric coating. The method for application of the protective coating onto the surface of a steel cartridge case includes a success forming of the zinc-phosphate layer serving as a prime coat, polymeric layer that is applied by a treatment of the cartridge case in one bath in an aqueous solution of the polymer of polyorganosiloxane and copolymer of butadiene with styrene and polymer and/or oligomer modifying it, or by a continuous successive treatment of the case in two baths, the cartridge case treatment in the first bath is conducted in an aqueous solution of the polymer of polyorganosiloxane and copolymer of butadiene with styrene, and it the second bath-in an aqueous solution of modifying polymer and/or oligomer, forming of the polymeric protective coating is conducted by hardening of the modified polymeric layer applied in the process of the thermal treatment up to forming of a sole spatially joined structure of the polymeric compound.
EFFECT: enhanced resistance to corrosion of the cartridge case coating and resistance of the given coating to attrition.
13 cl, 3 ex
FIELD: chemical industry; metal-working industry; other industries; methods of the corrosion protection of the steels by application of the zinc-chromate coatings.
SUBSTANCE: the invention is pertaining to the field of the corrosion protection of the metals and may be used for the protection of the steel articles against corrosion by means of the multilayer coatings. The zinc-chromate coating on the steel contains the zinc layer produced out of the sulfate electrolyte, and the external chromate layer. At that the coating in addition contains the inner electric current- conductive chromate layer produced out of the solution, (g/dm3): CrO3 - 8, HNO3 - 4, Na2SO4 - 12, Cr2(SO4)3·18H2O - 5, Na2SnO3·3H2O - 8. The zinc-chromate coating on the steel contains the zinc layer produced out of the sulfate electrolyte, and the outer chromate layer. At that the zinc-chromate coating additionally contains the inner electric current conductive chromate layer produced out of the solution, (g/dm3): CrO3 - 8, Na2SO4 - 12, Cr2(SO4)3 ·18 H2O - 5, In(NO3)3 - 6. The technical result of the invention is the raise of the protective capability of the zinc-chromate coating on the steel on the average in 2 times.
EFFECT: the invention ensures the increased protective capability of the zinc-chromate coating on the steel on the average in 2 times.
1 dwg, 4 ex
FIELD: electrical engineering; electricity-conductive compound in the form of flocculent particles.
SUBSTANCE: proposed compound has titanium oxide with mean large diameter of 1 to 100 μm and mean thickness of 0.01 to 1.5 μm, potassium in amount of 0.03 to 5 mass percent in the form of potassium oxide (K2O), as well as first electricity-conductive layer which is formed on surface and has in its composition tin oxide and antimony, and second electricity-conductive layer which is formed on first electricity-conductive layer and has in its composition tin oxide. Proposed electricity-conductive composition in the form of flocculent particles is capable of imparting good electricity-conductive properties even when formed in layer of 1 to 10 μm in thickness.
EFFECT: improved properties of electricity-conductive composition.
6 cl 3 tbl, 6 ex
FIELD: materials resistant to corrosion accompanied by metallic dust formation; methods of manufacture of such materials, reactor materials in particular subjected to action of media supersaturated with carbon.
SUBSTANCE: proposed material contains alloy and protective oxide coat on base of alloy. Protective oxide coat consists of at least two oxide layers: first layer which is farthest from surface of alloy is made from manganese oxide. Alloy contains base metals including iron, nickel and cobalt and alloying metals including chromium and manganese; concentration of manganese is at least 10 mass-% and concentration of chromium is at least 25 mass-%. Total content of chromium and manganese is no less than 40 mass-%.
EFFECT: enhanced resistance of material to corrosion with metallic dust formation in media supersaturated with carbon.
2 dwg, 1 tbl, 1 ex
FIELD: foundry, possibly technology, painting art and architecture.
SUBSTANCE: method comprises steps of forming pattern of article for making according to it rough mold; performing sand blasting of working surface of rough mold; depositing onto its surface layer of alloy being material of decorative article; releasing deposited layer from rough mold due to difference of thermal expansion factors of materials of deposited layer and substrate.
EFFECT: possibility for making thin-wall decorative articles of metals and alloys with high surface quality, small mass due to their porous structure and thin wall and with mechanical properties sufficient for using article in interior.
4 dwg, 1 ex
FIELD: different industries; methods of manufacture of the spindles out of the steel for the pipeline fittings.
SUBSTANCE: the invention is pertaining to the method of manufacture of the pipeline fittings, in particular, the spindles, shutters and valves for shutting and control of consumption off the mediums passing through the pipelines. The method includes the thermal treatment and the mechanical working with formation of the threading. After the mechanical working exercise nitriding by the vacuum ion-implantation method at the temperature of T = (320-450)°С, the voltage - U = (250 - 750)V and during the time t = (20-60) minutes. The technical result consists in the increased reliability and the service life of the pipeline fittings.
EFFECT: the invention ensures the increased reliability and the service life of the pipeline fittings.
3 cl, 1 ex, 2 dwg
FIELD: manufacture of articles with normalized properties of surface layer, namely for improving strength of press tools at pressing shapes of titanium alloys.
SUBSTANCE: method comprises steps of surfacing hard alloy layer forming reinforcing structure onto base material; applying by electric spark alloying layer of hard alloy having plastic components onto surfaces layer of hard alloy in order to provide coating with reinforcing effect; then applying onto surface of formed coating additional layer having oil-phobic properties.
EFFECT: enhanced strength of part with such coating, lowered stresses of base metal.
2 cl, 1 ex
FIELD: building industry; method and devices allowing to make the three-dimensional visual effects on the surface of the metallic material.
SUBSTANCE: the invention is pertaining to application of the coatings on the surfaces of the metallic materials. The method provides for application of the coating made out of the metal or out of the metal alloy. The first layer of the applied coating has the depth smaller or equal to 2.5 microns. Then conduct the thermal treatment of the first layer of the coating by means of the fast heating by heating the surface of the first layer of the coating up to the temperature laying within the limits from0.8 Tf up tothe temperature of Tf, whereTf is the temperature of smelting of the metal or the metal alloy, which is used in application of the first layer of the coating. Then they apply the second layer of the coating from the metal or the metal alloy with the depth smaller or equal to 1 micrometer. The invention also presents the material containing the indicated layers as well as the device for application of the coating on the metallic material in the form of the strip, which contains the tool for the strip pulling and the tool for application of the coating. On the path of motion of the dawn strip there are in series mounted the following tools: the tool for application of the first layer on the strip; the strip fast heating tool, which is capable to heat the surface of the first layer up to the above-indicated temperature; the tool for application on the strip of the second layer of the metal or the metal alloy. The technical result of the invention is creation of the method and the device allowing to produce the three-dimensional visual effects on the surface of the metallic material.
EFFECT: the invention ensures creation of the method and the device for production of the three-dimensional visual effects on the surface of the metallic material.
24 cl, 6 dwg, 8 ex
FIELD: electrophysical and electrochemical treatment processes such as electric-erosion alloying, possibly treatment of surfaces of inserts of sliding bearing assemblies.
SUBSTANCE: method comprises steps of applying onto working surface of inserts by electric-erosion alloying with use of tool-electrodes layers of silver, copper and tin-base babbitt. Electrochemical coating of silver and copper is applied at pulse energy 0.01 - 0.05 J and coating of tin-base babbitt is applied at pulse energy 0.01 - 0.06 J. Coating layers are applied in different directions: crosswise, lengthwise and by inclination angle relative to surface at least of one block of inserts. Inserts having micro-relief on their working surfaces feature enhanced carrying capacity.
EFFECT: improved operational reliability, carrying capacity of inserts.
2 cl, 5 dwg
FIELD: machine engineering, namely tool strengthening method, possibly for increasing operation resource of metal cutting tools, for example of cold forging punches.
SUBSTANCE: method comprises steps of saturating working surface of tool with nitrogen by depth 30 - 40 micrometers before applying multiple-layer coating for performing compensation of difference of thermal-physical-mechanical properties of coating and tool materials; applying onto nitrogen-saturated surface mutually alternating intermediate and compensating layers. Hardness of next intermediate layer is higher than that of previous one. Intermediate layers provide gradual change of hardness from substrate to surface of coating and therefore they provide increased impact viscosity. Compensating layers made of pure titanium or chrome provide bonding between layers. After applying each layer, ion polishing is realized. Last surface layer is made of plastic material used for running and concealing micro-cracks of wear-resistant layer of coating.
EFFECT: enhanced resource of tool subjected to dynamic loads at operation.
FIELD: metallurgy, namely chemical and heat treatment of refractory alloys, possibly used for applying protective coatings onto blades of gas-turbine engines.
SUBSTANCE: method comprises steps of applying onto inner and outer surfaces of parts diffusion aluminide coating in circulating gaseous medium; applying coating in low-active system at relation of reaction surfaces Fн/Fo = 0.3 - 0.7, where Fн - total surface of parts to be coated; Fo - total surface of saturating mixture; then applying onto outer surfaces of parts cladding coating, namely MeCrAlY, where Me - Ni, Co, NiCo by ion-plasma process or electron beam evaporation in vacuum.
EFFECT: improved fire and corrosion resistance of coating, increased resource of blades of gas-turbine engine.
1 cl, 1 ex, 1 tbl
FIELD: metal coats, in particular for gas turbine engines operating at high temperature.
SUBSTANCE: claimed metal coat contains (mass %) cobalt up to 18; chromium 3.0-18; aluminum 5.0-15; yttrium 0.1-1.0; hafnium up to 0.6; silicium up to 0.3; tantalum 3/0-10; tungsten up to 9.0; rhenium 1.0-6.0, molybdenum up to 10, and balance - nickel. Method of invention includes providing of support from at least one metal materials based on nickel, cobalt or iron followed by application of coating layer.
EFFECT: coats of high oxidation resistance and endurance strength.
33 cl, 1 tbl
FIELD: metallurgy, namely processes for applying wear resistant chrome carbide coatings, protection of surface of articles of titanium and its alloys against action of aggressive media, abrasive wear and high temperature influence.
SUBSTANCE: method comprises steps of applying sub-layer of metal and further applying of wear resistant chrome carbide layer by pyrolysis of chrome-organic compounds of bis-arene. Before applying wear resistant layer of chrome carbide, sub-layer of nickel or its alloys with thickness 0.1 - 10 micrometers is applied.
EFFECT: possibility for applying on titanium and its alloys wear resistant coating with enhanced adhesion degree of coating and substrate and with improved strength against crumpling at elimination of cracking.
4 cl, 1 tbl, 4 ex
FIELD: corrosion prevention technologies.
SUBSTANCE: method includes serial application of layers of polymer compositions to metallic surface, while serial layers of polymer compositions are made with various thermal expansion coefficients. As said polymer composition polyurethane compound is used with special admixtures and filling agent, influencing thermal expansion coefficient of covering layer, and content of said filling agent in each following layer is set less than content of said filling agent in previous layer.
EFFECT: higher efficiency.
2 cl, 9 ex
FIELD: electrochemical technologies.
SUBSTANCE: method includes dipping zinc-covered article in chromium-containing solution, prior to dipping electrolytic application of zinc is performed onto previously cleaned surface of zinc-covered article with following washing and drying, and after chromatizing article is dried by hot air.
EFFECT: protective cover, resistant to corrosion effect in atmosphere, polluted with industrial gases, and to effect from external loads of direct and alternating character, to provide for higher reliability and durability of article.
FIELD: mechanical engineering; methods of formation of shaped pieces out of a sheet steel.
SUBSTANCE: the invention is pertaining to the field of mechanical engineering, in particular, to the methods of formation of shaped hardware products from sheet steel. The offered method provides for a chemical-thermal treatment of slab billet in depth from the side of a form-shaping surfaces and a profiling. At that thus before realization of the chemical-thermal treatment conduct cleansing of the whole surface of the slab billet, on one or both cleansed surfaces superimpose a drawing determining the form of the bent pieces and on the determined area apply a layer of stannum or eutectics Pb-Sn, coat the rest area of the slab billet with a hermitic varnish, and the chemical-thermal treatment conduct by aluminizing. In particular cases of realization of the invention the cleaning is conduct by working. The aluminizing is carried out for 3-5 minutes: on a clean surface apply a drawing using a metallic pencil; a layer of stannum or eutectics Pb-Sn apply by a galvanic method. The technical result of the invention is application of methods of chemical-thermal treatment, in particular, the aluminizing for production of bent-shaped pieces with a protective coating.
EFFECT: the invention offers methods of chemical-thermal treatment, in particular, the aluminizing for production of bent-shaped pieces with protective coatings.
5 cl, 3 dwg, 2 ex
FIELD: working of steel products, possibly restoration of worn surfaces of cylindrical articles such as cylinders of sucker rod depth pumps.
SUBSTANCE: method comprises steps of mechanical working, iron plating of inner surface of article, carburization, chrome plating and further heat treatment with isotermal soaking at temperature of obtaining large-flake pearlite.
EFFECT: restoration of geometry parameters of inner surface of worn cylindrical articles, enhanced strength and predetermined surface roughness of articles.
FIELD: methods of hardening of restored surfaces of steel products.
SUBSTANCE: the invention is pertaining to the field hardening of metallic surfaces of steel products. The offered method includes a cyanidation of the electrodeposited layer of an iron-molybdenum coating within 1-4 hours at the temperature of 600-650°C with usage of a paste of the following composition (in mass %): yellow bloody salt - 30...45, sodium carbonate - 8...10, calcium carbonate - 5...10, carbon-black - up to 57. The technical result of the invention is boosting hardness and a wearability of surfaces of steel component parts.
EFFECT: the invention ensures an increased hardness and a wearability of surfaces of steel component parts.
FIELD: methods of production of antiemission coatings.
SUBSTANCE: the offered invention is pertaining to formation of coatings and may be used for production of antiemission coating on grids of powerful oscillating tubes. The offered method includes formation of a layer of the tube grid material carbide, application of a layer of zirconium carbide from a metallic plasma of the vacuum-arc discharge at the temperature of the grid above 300°C, formation of shaping of a surface layer of platinum and an annealing. The technical result of the invention is development of a method of production of the intermetallic antiemission coatingPt3Zr having improved operational features.
EFFECT: the invention ensures production of the intermetallic antiemission coating with improved operational features.
1 tbl, 4 dwg