Procedure for laser treatment of surface of roll and crest of railroad wheel pairs

FIELD: metallurgy.

SUBSTANCE: wheel pair is installed and fixed in rotating facility. Matte coating eliminating reflection of laser beam is applied on surface subject to treatment with CO2-laser. Focusing system is adjusted so, that diametre of laser radiation spot corresponds to a chosen mode. Required rates of wheel pair rotation and laser beam transfer are set by means of program controlled device. Compressed air blows off a flare of products of combustion into exhaust ventilation; laser treatment is carried out under a chosen mode to obtaining geometry of paths of laser strengthening eliminating melting zones of thermal effect and mutual overlapping of laser strengthening paths.

EFFECT: increased wear resistance of roll surface and crest of wheel pair due to increased hardness and due to obtaining high dispersed structure of strengthened zone.

1 dwg

 

The invention relates to a method of hardening the working surfaces of parts and components from different grades of steel, working in conditions of friction-wear, and in particular to methods of laser surface treatment of skiing and crest rail wheelset.

The prior art method of hardening steel wheels, described in the author's certificate SU 1693094 A1, 23.11.1991. In this way conduct heat treatment of the rim, the reinforcement layer adjacent to the running surface of the wheel in the radial direction, and on the surface of the ski perform blind holes, the walls of which have a hardness exceeding the hardness of the material in which they are performed. However, this method of hardening steel wheels does not provide the necessary wear resistance.

As a prototype adopted the method of hardening steel wheels, described in the copyright certificate EN 2127768 C1, 20.03.1999. In this way produce heat treatment of the surface profile of the riding wheel and its reinforcement by the stiffening elements having a hardness exceeding the hardness of the material, in which the stiffening elements made in the form of tracks, with tracks that encircle the surface profile of skating wheels, perform open and shift places rupture paths between a ratio of the section height of the track to it, the width corresponds to 1 to 3-5. However, this method of hardening steel wheels also does not provide the necessary wear resistance.

The technical result that can be obtained from the use of the invention is to improve the wear resistance of the surface and the crest wheelset due to the increase in the hardness and obtain the fine structure of the hardened zone.

This technical result is achieved due to the fact that in the method of laser processing surface and the crest rail wheelset establish and fix the wheel pair in the rotation, the surface to be processed CO2laser, prepared under laser hardening by applying a special matte coating, eliminating the possibility of reflection of the laser beam, make adjustment of the focusing system so that the spot diameter of laser radiation corresponded to the mode set using the software-controlled device required rotation speed of the pair of wheels and moving the laser beam include compressed air for blowing torch products of combustion in the flare exhaust ventilation and produce laser processing surface and the crest rail of the pair of wheels on the selected mode.

Figure 1 shows the rolling surface and the crest of the railway is one of the wheels, hardened by the laser.

Laser hardening of the wheelset wheelset is scanning the laser beam with respect and exposure parameter values that ensure the stability of the process and obtaining the geometry of the tracks hardening without melting the heat-affected zone. Hardening is performed without mutual overlap of the paths of laser hardening.

Laser hardening of the wheelset wheelset should be made on a special technological CO2-the laser in the rotation of wheel pairs.

Setting the spot diameter of laser radiation is determined by the setting of the processing surface of the pair of wheels at such a distance from the focal plane of the optical system, which should correspond to the cross section of the laser beam having a given diameter.

The process of laser surface hardening of riding wheelset is performed in the following sequence:

- installed a pair of wheels in the rotation and secured;

- the surface to be processed, prepared under laser hardening by applying a special matte coating, eliminating the possibility of reflection of the laser beam;

- adjust the focusing system so that the spot diameter of the laser was sluttysupernatural the selected mode;

- installed through software-controlled devices required rotation speed of the pair of wheels and moving the laser beam;

turns on the compressed air for blowing torch products of combustion in the flare exhaust ventilation;

- made laser processing surface of the pair of wheels on the selected mode.

The method of laser processing surface and the ridge railway wheel pairs, namely, that establish and fix the wheel pair in the rotation, the surface to be processed by the laser, prepared under laser hardening by applying a matte coating to prevent reflection of the laser beam, make adjustment of the focusing system so that the spot diameter of laser radiation corresponded to the selected mode, and to adjust the spot diameter of the laser radiation to determine the distance from the focal plane of the optical system to the treated surface of the wheelset, which should correspond to the cross section of the laser beam having a given diameter, set with software-controlled devices required rotation speed of the pair of wheels and moving the laser beam include compressed air for blowing torch combustion products in the exhaust ventilation, produce lasern the first processing surface and the crest rail wheelset CO 2laser on the selected mode to obtain the geometry of the paths of laser hardening, excluding the melting zone of thermal influence and mutual overlapping paths of laser hardening.



 

Same patents:

FIELD: metallurgy.

SUBSTANCE: invention relates to thermal treatment field. For providing of solidity not less than 300 HB on depth not less than 50 mm from surface of volution wheel tread, exclusions during the process of cooling of formation of hardening structures and providing of maximal drop of residual voltage, solid-rolled wheels made of steel with carbon content no less than 0.60 wt % is heated till the austenitising temperature and intensively cooled, at that during the cooling process from the moment of the beginning for 50-100 seconds it is implemented increasing of cooling intensity of comb roll surface and side surfaces of crown by all height from 0 till value 2-3 W/(cm2·s), then it is cooled during 40-300 sec with constant refrigeration rate of specified wheel face equal to value 2-3 W/(cm2·s) for providing of strengthening in all crown volume.

EFFECT: providing of material strengthening.

2 dwg, 3 tbl

FIELD: heat treatment of parts made in form of bodies of revolution from metal materials; cooling of monoblock wheels, tires, wheel discs and similar discs and rings such as railway wheels and tram wheels, gear wheels and sprockets.

SUBSTANCE: first, scale is removed from one and the same device by one and the same method to improve its mechanical properties and then mechanical properties are determined and reproduced through complex cooling performed in functional zone; cooling processes are different for different sections; parts are cooled at control or adjustment in "on-line" mode due to spraying or blowing-off by one cooling medium.

EFFECT: enhanced efficiency.

27 cl, 2 dwg

The invention relates to mechanical engineering, in particular to a method of heat treatment of bearing and supporting wheels of complex-alloyed improve steels

The invention relates to a transport machine building, in particular to a method of recovery of the rail transport wheels

The invention relates to the field of metallurgy, in particular to a heat treatment of metals with the use of high frequency currents, and can be used in mechanical engineering for hardening gear rims

The invention relates to heat treatment of ferrous metals and can be used in the manufacture of tyres for horizontal and vertical rolls of rolling mills

The invention relates to railway transport, and specifically to apparatus for hardening of the rims of the wheels and the rails

The invention relates to the processing of metals by pressure and is aimed at improving the technology of manufacturing products of the type wheels by stamping and rolling

The invention relates to mechanical engineering, in particular to a method of manufacturing the flange of the wheels of the rolling stock, and can be used for heat treatment of parts with the outer surfaces of rotation

The invention relates to the processing of metals by pressure and can be used in the manufacture of a wide range of wheels for vehicles, including automotive, aviation, and rollers for transport on tracks

FIELD: metallurgy.

SUBSTANCE: procedure for thermal treatment of item out of aluminium alloy consists in stages whereat item is subject to heat treatment for solid solution, to tempering, and to heating tempered item by preliminary ageing at stage of heat treatment. Heat treatment by preliminary ageing is carried out at conjugating base surface of the item with base surface of a heating plate. Preliminary ageing treatment is performed outside furnace. The item out of aluminium alloy and the heating plate are conjugated by placing a protective layer between the item out of aluminium alloy and the heating plate. The protective layer is made out of insulating material chosen from a group including glass-cloth, ceramic, glass wool, mineral cotton and woven and not woven polymer material. Also here are disclosed the heating plate and the facility for implementation of heat treatment by preliminary ageing.

EFFECT: production of dispersed-strengthened aluminium alloy with properties required for its implementation.

26 cl, 7 dwg

FIELD: metallurgy.

SUBSTANCE: method involves annealing of steel plate in annealing furnace having front heating zone, rear heating zone, exposure zone and cooling zone in steel plate movement direction, and application of coating by means of hot dipping method of steel plate to electrolytic bath located after annealing furnace at continuous supply of steel plate from annealing furnace to electrolytic bath of hot dipping. Heating and exposure of steel plate is performed at temperature of steel plate of at least 300°C or more by applying indirect heating; at that, in front heating zone, rear heating zone, exposure zone and cooling zone there formed is gas medium consisting of hydrogen in quantity of 1 to 10 vol. % and nitrogen and inevitable impurities are the rest, and dew points of front heating zone are brought to the value which is less than -25°C, rear heating zone and exposure zone to the value of -30 to 0°C, and cooling zone - to the value of below -25°C, and annealing is performed at maximum steel plate temperature during heating in front heating zone of 550 to 750°C.

EFFECT: invention allows preventing formation of surface metallic iron oxides in relatively low temperature area and inducing internal Si or Mn oxidation, which allows avoiding deterioration of covering steel plate capability and deceleration of alloying.

8 cl, 2 dwg, 2 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: invention refers to metal processing industry, and namely to steel item hardening process. In order to improve processing rate, item quality and to enlarge the range of processed items, surface layer of the item is heated with local concentrated energy source with further cooling owing to heat removal to the item body; at that, surface layer of the item is heated in vacuum owing to the energy concentrated in cathode spots of vacuum arc discharge, which move along the item surface; vacuum arc discharge burns between the item being cathode and anode.

EFFECT: use of vacuum arc discharge allows increasing vacuum hardening of steel items of various geometrical shape.

1 ex, 1 tbl, 3 dwg

FIELD: metallurgy.

SUBSTANCE: in the capacity of cooling liquid it is applied water structured with application to water and hardened product ultrasonic vibrations at a frequency 18-21 kHz.

EFFECT: abatement of hazardous emissions into the atmosphere from thermal departments, increasing of resistance to brittle and endurance failure, reduction of crack formation during quenching of products.

1 ex

FIELD: metallurgy.

SUBSTANCE: in the capacity of cooling liquid it is applied water structured with application to water and hardened product ultrasonic vibrations at a frequency 18-21 kHz.

EFFECT: abatement of hazardous emissions into the atmosphere from thermal departments, increasing of resistance to brittle and endurance failure, reduction of crack formation during quenching of products.

1 ex

FIELD: mechanical engineering.

SUBSTANCE: parts are conditioned and cooled in medium of inert gas. Parts are stacked on shelves of an open, not sealed device; further parts are thermo-treated in a pressure tight muffle furnace with a tank for cooling at excessive pressure; per cent contents of oxides in inert gas is decreased during heating, conditioning and cooling; for this purpose before loading the device with parts into a cooling tank the device with parts is covered with a protective case out of thin sheet steel; set of disks with holes out of thin sheet steel is attached to the base of the device; parts are unloaded from the cooling tank at temperature not above 200°C.

EFFECT: upgraded quality of part surface due to elimination of heat tints, also increased plasticity and viscosity of parts after heating.

1 ex

FIELD: metallurgy.

SUBSTANCE: item out of alloyed die steel is subject to magnetic treatment in constant magnetic field with strength not less 16.9×105 A/m at temperature 20°C with number of cycles not less, than three and with conditioning for 2 minutes in each cycle; further item is subject to thermal treatment; also items are oriented across or along magnetic field.

EFFECT: increased reliability of dies out of complex alloyed steel by thermal treatment at presence of external magnetic field.

2 cl, 1 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: invention relates to method of coating on steel strip. Steel strip allows following composition, wt % C≤1.6, Mn 6-30, Al≤10, Ni≤10, Cr≤10, Si≤8, Cu≤3, Nb≤0.6, Ti≤0.3, V≤0.3, P≤0.1, B≤0.01, N≤1.0, iron and unavoidable admixtures - the rest. Primarily on steel strip it is applied aluminium layer, then it is implemented annealing, in process of which it is formed interlayer, consisting, mainly, from aluminium and iron, and it is coated molten metal, consisting of Al/Si-alloy, aluminium, zinc or zinc alloy.

EFFECT: obtaining steel strips with metallic coating, allowing high corrosion stability and well welding characteristics.

10 cl, 4 dwg

FIELD: metallurgy.

SUBSTANCE: installation contains top and bottom fissural collectors, installed behind them top and bottom rollers with adjusting clearance for placement in it of hot-rolled sheet and collectors with injectors, located in top and bottom interroller space, additionally collectors with injectors are implemented as multichamber, and output cross-sections of injectors of one chamber of each collector differs from output cross-sections of injectors of other chamber of the same collector.

EFFECT: obtaining hot-rolled sheet with specified level of mechanical properties and structure in wide grade and thickness range.

2 dwg

FIELD: metallurgy.

SUBSTANCE: there is proposed treatment method of ingots with single-crystal structure from heat-resistant nickel alloys by hot isostatic pressing. Method includes treatment of ingots by two-stage mode. At first stage of casting is heated up to temperature 950-1075°C and is isolated at this temperature and pressure of operating environment 100-150 MPa during 0.75-2 hours. On second - it is heated up to temperature for 10-50°C less than full solution temperature γ-phase with pressure buildup of operating environment up to 150-200 MPa and it is isolated at this temperature and pressure during 1-3 hours. In the capacity of operating environment it can be used argon.

EFFECT: there are increased mechanical properties and efficiency report of castings at simultaneous reduction of process duration of its manufacturing.

2 cl, 1 tbl, 1 ex

FIELD: nanotechnology.

SUBSTANCE: invention refers to method of coloured image formation on metallic surfaces (text and graphic, monochrome and coloured) by means of forming nanostructures in kind of oxide films resulted in process of local heating with heat source of pulse effect (for example, laser radiation, plasma, electro-contacting or other kind of heating). Properties of oxide films (physic-mechanical, geometrical, colorimetric and others) depend on technological parametres of heat effect source, which in their turn are determined with thermal-technical properties of a treated material. The method proceeds from calculation of mode of thermo-pulse effect and of distance between zones of impulse effect in dependence on thermo-physic characteristics of material and parametres of image in such a way, that temperature to be created in the zone of effect will be required and sufficient to form oxide film with a specified colorimetric property.

EFFECT: possibility to apply coloured image on any metal surfaces without their preliminary treatment and without preliminary plotting of graduated curves.

2 cl, 4 dwg, 1 ex

Up!