The method of blasting products
(57) Abstract:The invention can be used for surface preparation of steel products to the plasma spraying, cleaning descaling, peening of metal products and corrosion protection. The invention aims to improve the adhesion of thermal spray coatings to the substrate. This is achieved in that on the surface of the product serves the steel fraction containing 45-50 wt.% the fraction of chrome steel. 3 table. The invention relates to the processing of products fraction and can be used primarily for surface preparation of steel parts to the plasma filling, cleaning descaling, peening of metal products and corrosion protection.There is a method of blasting in which the surface of the product serves a mixture of steel and aluminum fractions of different diameters, and aluminum fraction is 25 to 30% of the total weight of the mixture, and the diameter of an aluminum fraction in 2 to 3 times smaller than the diameter of the steel.The disadvantage of this method is that it contributes to reducing the adhesion strength of thermal spray coatings. When preparing the surface is the second layer of aluminum, covered with oxides. Oxides of aluminum have a high activation energy and perform the activation barrier for the flow of processes of chemical interaction between the sprayed particles to the substrate, the formation of diffusion and, as a consequence, a strong adhesive bond between them.The invention aims to improve the adhesion of thermal spray coatings to the substrate (adhesion).This is achieved by the fact that the fraction serves on the surface of the product in the form of a mixture with 45 to 50% weight content of the fraction chromium steel.Comparative analysis of the prototype allows us to conclude that the claimed method differs from the known fact that during its implementation fraction serves on the surface of the product in the form of a mixture with 45 to 50% by weight content of chromium steel. It provides education on the surface of the workpiece layer of chromium, having a high diffusion mobility and contributing to increase the adhesion of the coatings.The claimed method blasting products corresponds to the category of "novelty" and allows to make a conclusion about its compliance with the criterion of "significant difference".A forceful impact leasuithe surface topography, the saturation of its structural defects. This helps to increase the energy of the surface atoms and the speed of their diffusion in the process of chemical interaction with the molten particle.The fraction chromium steel on impact with the surface is deformed. When this material fraction is transferred to the surface of which is covered with a layer of chromium of a thickness (~300). Chrome on the surface of workpiece is held due to forces of mechanical gearing and the non-bonded interaction forces (type forces van der Waals forces).At thermal spraying the adhesive strength of the coating to the substrate depends on the depth of the mutual diffusion penetration of the atoms of the fused particles and sputtered surface. Chrome, whose diffusion coefficient in metals than aluminum (PL.1, 2), in contact with the molten particle will prodifferent in the coating and the substrate on the big clay, providing a more durable adhesive bond.Decreasing the weight content of the fraction chromium steel in a mixture below 45% the intensity and quality of the processed surface is reduced, which reduces the adhesion strength of thermal spray coatings. The expansion of the coating and is not economically advisable.Example. Studies were conducted on steel samples cut from radical necks of a cranked shaft of the engine ZIL-130. Shot blasting of the samples was carried out on pneumogastric installation ejection deployme nozzles at a pressure of compressed air 0.4 to 0.6 MPa.As an abrasive was used a mixture of steel shot DSC (GOST 11964 - 81) and the fraction made of a thin sheet of chrome steel H (GOST 5582-75) in a ratio of approximately 1 to 1.Quality assessment of sample processing was performed according to the value of the adhesion strength of coatings (powder PNU) with the disengagement of the normal. Moreover, the thickness of the deposited layer was 0.8 mm, the time between processing and plating 1 minutes Technological options for processing samples and their corresponding values of adhesion of the coatings are presented in table 3.The analysis of the table shows that the best values of the adhesion strength obtained for variants 6, 7, 8, but a lower percentage fraction of chrome steel with maximum adhesion corresponds to the sixth embodiment. This allows us to consider this option is the most rational for the implementation of the intended method of shot peening.The method of blasting products, including applying to the surface a mixture of steel shot, characterized in that on the surface of the product serves a mixture containing 45 to 50 wt. fraction chromium steel.
FIELD: mechanical engineering.
SUBSTANCE: method comprises wetting the conducting granules of fluid with weak-conductive liquid and applying voltage. The value of the voltage should be higher than that required for the onset of current in the fluid-blank circuit and lower than that of the beginning of shorts in the circuit. The weak-conductive fluid is made of industrial water.
EFFECT: improved cleaning.
1 cl, 1 dwg, 1 ex
FIELD: mechanic working of metals, namely abrasive-jet finishing, mainly of precision friction pairs.
SUBSTANCE: method comprises steps of working fixed sample by acting upon it with compressed air stream containing abrasive particles; measuring in fixed sample sizes of non-worked spots in static imprint of air-abrasive jet having axial percentage density of lubricant micro-recesses equal to 0.45; acting upon part surface with air-abrasive jet for shaping lubricant micro-recesses. Contour of air-abrasive jet is to be inside circle with radius r = 0.74R where R - radius of static imprint of air-abrasive jet on working plane. Working is realized while providing part oscillations with frequency 20 - 30Hz and with amplitude equal to half of specified dimension of non-worked spots in zone of static imprint of air-abrasive jet on fixed sample. Percentage density of lubricant micro-recesses is in range 0.45 - 0.25.
EFFECT: uniform distribution of lubricant micro-recesses.
2 dwg, 1 ex
FIELD: machine building.
SUBSTANCE: mainly, part consists of alloyed chromium containing material. Surface of the part at least partially is treated by shot-blasting. Also the part mainly consists of material with ferrite structure of average contents of chromium not more, than 8 wt % or with martensite structure with average contents of chromium not more, than 14 wt %.
EFFECT: increased resistance to oxidation and increased corrosion resistance of part.
SUBSTANCE: invention refers to shot-blasting hardening of metal surface made out of light alloy. At the first stage surface of metal is shot-blasted with the first particles containing iron as main component with average size of particles not less, than 0.1 mm and not more, than 5 mm. Upon completion of the first stage and at the second stage surface of metal is shot-blasted with the second particles, in essence, not containing iron, with average size of particles not more, than 200 mcm. At the first stage pressure of sputtering is not less, than 0.1 MPa and not more, than 1 MPa, preferably, not less, than 0.2 MPa and not more, than 0.5 MPa. At the second stage pressure of sputtering is not less, than 0.1 MPa and not more, than 1 MPa, preferably, not less, than 0.3 MPa and not more, than 0.6 MPa.
EFFECT: efficient removal of iron fractions adhered to metal surface, and improved fatigue properties of produced metal component, practically without change of size and without metal surface profile roughening.
2 cl, 10 dwg, 1 tbl, 4 ex
FIELD: process engineering.
SUBSTANCE: set of invention relates to metal working, particularly turbo machine parts working. Metal part comprises at least one first zone with at least one first layer to be shot blasted, and second subsurface layer arranged at notable larger depth of the part and subjected to compacting effects of laxer beam. In part machining, aforesaid first zone is, first, shot blasted, then compression compaction is performed by laser beam. In above described way, turbo machine vane is machined.
EFFECT: improved operating properties of machined parts.
13 cl, 6 dwg
FIELD: process engineering.
SUBSTANCE: invention aims at fabricating gas turbine engine vanes with, at least, one rib on free end by consecutive application of metal layers on vane foot to form extending part of rib 2282. For this, laser source is activated connected with optical head 34 and focused to the point of rib foot top surface, as well as source 34, 35 of first and second powder materials connected with spraying nozzle 38. Powder is fed into melt bath to produce localised bulge. Thereafter, optical head 34 and nozzle 38 are displaced to another point adjoining said bulge to repeat said jobs to complete layer formation on foot 82. Note here that head 32 is displaced longitudinally between edges 120, 220 and 122, 222 relative to produced bulge to form two annular seams 83a on rib foot surface. Gap between annular seams 83a are filled with first powder material.
EFFECT: simplified process, higher quality of product.
18 cl, 13 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to turbine vane jet processing. Proposed device comprises chamber with at least one bore and turbine vane holder. Chamber bore allows processing to be made through it. Holder comprises section that stops completely said bore to completely embrace turbine vane section, not to be processed, between bore and turbine section to be processed. Note here that said holder completely embraces turbine vane base edge. Chamber bore is surrounded by collar extending inside said chamber.
EFFECT: reduced costs.
8 cl, 7 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to surface hardening and may be used for increasing wear resistance of ball mill lining. Ball mill is loaded with chilled iron shots at loading factor making 30-40% of mill drum inner volume. Ball mill is started at drum rpm Vd to allow shots to fall along normal to lining surface. Note here that Vd=0.75Vd cr, where Vd cr is drum rpm corresponding to shot parabolic trajectory transition of circular trajectory. Interval of shot bombardment is selected to allow twenty-fold impacts on entire surface of lining.
EFFECT: higher wear resistance.
FIELD: process engineering.
SUBSTANCE: invention relates to surface hardening of welding zones in articles made from aluminium bronze. Welding zone consisting of seam metal surface and bronze surface is hardened 30 mm from boundary of fusion with seam by shots. Shots with diameter of 1.6-2.4 mm are used to this end. Blasting is performed is performed in discrete steps with shots kinetic power of 0.68×10-3 J to 2.93×10-3 J for 120-240 s form fixed working head. Layer hardened in welding zone features thickness not smaller than 0.7 mm.
EFFECT: higher fatigue strength.
2 cl, 1 tbl
FIELD: machine building.
SUBSTANCE: method of surface hardening of steel products, includes the processing of the product through shock action of corundum particles onto the surface using a gas-dynamic equipment to disperse the particles and their ejection from the nozzle. Acceleration of the particles is performed by a supersonic jet of air, and the products are processed at a speed of the nozzle movement (9-11)-2 m / sec, the distance from the nozzle to the surface of the product (9-11)-2 m and the air temperature at the nozzle exit 300-400°C.
EFFECT: use of the method makes it possible to reduce the product processing period in 2-4 times in comparison with the known method without reducing the degree of work hardening and thereby to increase the productivity of the process.
1 dwg, 1 tbl
FIELD: oil-producing industry; mining; boring equipment.
SUBSTANCE: the invention is pertaining to the field of boring equipment and may be used at building-up of boreholes in the deep and superdeep drilling, and also at the open-cut mines at the blastholes drilling with blasting of the mine face by air. The method provides for the milling machining of each cog and deposition on it of an abrasive resistant protective coating. Before milling machining it is necessary to exercise turning machining of the inner and outer surfaces of the rolling cutter. After milling machining deposit an anticementing coating on the surfaces requiring protection against cementation. Then exercise cementation of the rolling cutter, its subsequent tempering in the oil, the low tempering, the bearing tracks grinding and coating by vapor deposition of an abrasive resistant protective coating on the cutter teeth and its intercrowned pits of the milling cutter. The protective coating has the hardness in the interval from HRC64 up to HRA72. Deposition of the protective coating is exercised, when the limiting temperature of heating-up of the rolling cutter does not exceed the temperatureof tn=280°C, at which the loss of strength of the cemented surfaces starts. The abrasive resistant protective coating is deposited in one or several layers till reaching the preset project depth of 0.2-0.8 mm. The technical result of the invention is the increased reliability of protection of the surfaces of the milled reinforced items against the wear and the increased mechanical resistance of the drilling bit as a whole.
EFFECT: the invention ensures increased reliability of protection of the surfaces of the milled reinforced items against the wear and the increased mechanical resistance of the drilling bit as a whole.
3 cl, 1 dwg
FIELD: metallurgy; restoration of working surface of crystallizer walls without disassembly of it.
SUBSTANCE: method of restoration of crystallizer walls made from copper and its alloys includes making notch, 0.5 mm deep at depth of wear of working surface no less than 1.0 mm. Then, working surface at depth of wear no less than 0.5 mm is subjected to shot-blasting after which precoat of thermo-reactive material, 0.1-0.2 mm thick and working layer of wear-resistant material are applied by gas thermal spraying. Depth of residual wear is no less than 0.5 mm.
EFFECT: enhanced resistance of coat.
FIELD: chemical industry; other industries; deposition of coatings by the gas-thermal methods.
SUBSTANCE: the invention is pertaining to the field of deposition of coatings by the gas-thermal methods, in particular, to the plasma deposition. The invention presents the method of preparation of the surface before the plasma deposition of chromium carbonyl. The method includes realization of the electrospark doping in the carbonic gas medium with utilization of the electrode formed from the powder on the basis of chromium. The doping is conducted at the following modes: the specific duration of the doping is 2-3 minutes/cm2, the discharge current - 0.6-0.9 A, the amplitude of the electrode vibrations is 60-70 microns, the frequency of the electrode vibrations is IOO Hz. The technical result of the invention is the increase of the cohesion strength of the gas-thermal coating with the substrate.
EFFECT: the invention ensures the increased cohesion strength of the gas-thermal coating with the substrate.
FIELD: metallurgy industry; mechanical engineering; other industries; methods of the vacuum-arc treatment of the metal products.
SUBSTANCE: the invention is pertaining to the field of the vacuum-arc treatment of the metal products before deposition on them of the coatings and may be used in metallurgy industry, mechanical engineering and other industries. The method provides for the vacuum-arc refining of the product-cathode and deposition of the coatings. Before deposition of the coatings the vacuum-arc refining is combined with the simultaneous complete or local oxidation of the surfaces, for example, up to the yellow, blue, violet, brown, black colors and-or tints and the combinations of the colors and tints. During the treatment of the long-sized products the local oxidation can be conducted in the form of the longitudinal and-or transversal straps and areas. The mode of the oxidation is exercised due to vibrations of the arc or the arcs, and-or due to for example the change - the increase of the power of the arc and-or the power emitted by the product caused by the electric current passing through it in the section from the electric current feeder from the power supply or the power supplies feeding the arc or the arcs to the product-cathode up to the electric arc or the arcs. The technical result of the invention is expansion of the technological capabilities of the method of the vacuum-arc treatment, improvement of the quality and the extension of the assortment of the depositing coatings.
EFFECT: the invention ensures expansion of the technological capabilities of the method of the vacuum-arc treatment, improvement of the quality and the extension of the assortment of the depositing coatings.
FIELD: technological process.
SUBSTANCE: invention is related to methods of surface preparation for plasma sputtering of coatings and may be used for cleaning of different surfaces with abrasive materials. Method includes abrasive treatment of surface that is subject to sputtering with thermal abrasive jet directed at the angle of 40...45° to processed surface. Jet is formed from high-temperature gas flow with abrasive loose material with fraction size of 0.3 - 0.7 mm. Processing is carried out until surface roughness is 40-50 micrometer, at that the mentioned surface is heated with high-temperature flow of gases up to 70 - 210°C.
EFFECT: provision of high-quality adhesion of coating with surface subject to sputtering.
SUBSTANCE: invention refers to methods of treatment of planing machine rollers. The method includes preparing of roller body surface and application of strengthening coating. Preliminary preparation of roller body surface is performed by means of its blowing-off under pressure with iron shot of 180...200 mcm fraction. Further two-layer strengthening coating is applied by the method of gas-detonation sputtering. Also the interior layer of coating is applied with powder of tungsten carbide of 55...65 mcm fraction obtaining thickness of the interior layer of 15...25 mcm. The exterior layer is applied with copper powder with additives not more, than 0.6%, obtaining the thickness of the exterior layer of 8...10 mcm.
EFFECT: upgraded wear resistance of sheet planing roller.