Device for hardening of railway wheels
(57) Abstract:The invention relates to thermal processing of products, in particular wheels. The device comprises a support installed on it chanteuse platform, the drive roller and the non-driving side rollers, sprayers. To ensure reliable installation and fixing of wheels of different diameters at the optimal distance from the sprayer cantueso site kinematically connected to a support, which has the possibility of vertical travel and accommodation in the sprayer and the drive roller, and the side non-driving rollers are kinematically interconnected synchronous movement about an axis of the pad. The Cam roller mounted on a support, and katuysha Playground and bearing are connected via a lever system. 1 C.p. f-crystals, 2 Il. The invention relates to heat treatment of products in the field of metallurgy and engineering.A device for quenching of railway wheels  contains a frame located here with a lifting mechanism, pressing and rotating wheels and moving sprayers mounted on the linkage.The drawbacks are its complexity and low quality senii his rough hole in the hub.The closest in technical essence and the achieved result is a device for quenching wheel  contains a brace movably installed chanteuse platform, with a drive roller, spring-loaded levers pivoted on kanousei platform, side non-driving rollers movably mounted on the under - printnig the levers and mounted on the spring loaded lever sprayers.The characteristics of the prototype, in common with the claimed invention are sprayer, bearing about movably installed chanteuse platform, side rollers.To structural defects of the device selected as a prototype, is the lack of kinematic linkages between support and chanteuse platform that allows vertical movement of the wheel relative to the sprayer and the non-driving side of the rollers from each other, which does not provide reliable installation and fixing of the hardened wheels of different diameters at the optimal distance from the sprayer, sustainable cooling the working surfaces of the rims of the wheels and, consequently, reduces the hardening quality and service life of products.The basis of the invention the task is to improve a device for quenching kaziu hardened wheels of different diameters at the optimal distance from the sprayer, to achieve sustainable cooling the working surfaces of the rims of the wheels, to eliminate the possibility of accidental ingress of coolant on the drive and, in turn, contributes to the quality of quenching and lifetime of products.The problem is solved in that the device for quenching of railway wheels katuysha Playground kinematically connected with the support and installed with the possibility of vertical movement relative to the sprayer, and the side non-driving rollers kinematically linked with the possibility of symmetrical movement about an axis of the device.The causal link between essential features and achievable technical result is the following.The kinematic connection between cantueso pad support provides the ability to strictly vertical movement chanteuse platform when lowering the wheel in a sprayer and roller rotation mechanism that will allow you to install the hardened wheel at the optimal distance from the sprayer and ensures the quality of the vintage.The kinematic connection of the lateral non-driven rollers allows their symmetric convergence, call that provides a stable cooling of the working surface of the wheel rim, eliminates the possibility of accidental ingress of coolant on the drive wheels, which increases the hardening quality and service life of the wheel.In Fig. 1 and Fig. 2 shows a device for heat treatment of the wheel.Device for heat treatment of the wheel contains cantueso pad 1, side non-driving rollers 2, kinematically associated lever mechanism 3, provided with a power cylinder 4; kantola site 1 has a receiving sleeve 5 and / or 6 stops and is connected to the support lever 7 system 8 with the power cylinder 9. On the support 7 mounted sprayer 10, the rotating roller 11 with the actuator 12 and the lugs 13, 14.The device operates as follows.In the initial position katuysha site 1 is in the horizontal position. The hardened wheel with its hub is installed in the receiving sleeve 5 and is supported by a lateral surface of the rim on the supports 13, 14.Side rollers 2 power 4 cylinder with lever machanism 3 are symmetrically and fix the wheel along the axis of the device.The power cylinder 9 with the lever 8 katuysha site 1 with hardened wheel is rotated 90ostrictly vertically lowered into the sprayer 10 and rests on the roll is I the sprayer 10.After quenching katuysha site 1 power cylinder 9 via a lever mechanism 8 is set in the horizontal position; lateral rollers 2 by means of a power cylinder 4 and the lever 3 are reared and released the wheel.The use of the invention allows to achieve stable cooling the working surfaces of the rims of the wheels, to eliminate the possibility of accidental ingress of coolant on the drive and, in turn, contributes to the quality of the vintage and the life of the wheels. 1. Device for hardening of railway wheels, containing a support installed on it chanteuse platform, the drive roller and the non-driving side rollers, sprayers, characterized in that katuysha Playground kinematically connected with a support and has the possibility of vertical travel and accommodation in the sprayer and the drive roller, which is mounted on a support, and a lateral non-driven rollers are kinematically interconnected synchronous movement relative to the longitudinal axis of the pad.2. The device under item 1, characterized in that katuysha Playground and bearing are connected via a lever system.
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
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
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.
SUBSTANCE: plasma surface hardening is performed by plasma generator with work gas flow converter that has slit-like outlet. Flow converter face surface is made to fit processed part shape. In processing, slit-like outlet is located at α=30-60° to generatrix of converter face surface. Processing is performed with overlap of processing strip, overlap length making l≥h·-tgα, where h is the processing strip width.
EFFECT: notably reduced extension strain, higher efficiency of surface hardening.
2 cl, 2 dwg
FIELD: machine building.
SUBSTANCE: metal surface strengthening is carried out by means of low temperature plasma arc of direct action. As plasma generating gas there is used argon, mixture of argon with helium, and mixture of argon with carbon containing gases. Also, heating is performed with magnetic oscillation of arc with triangle shape of voltage pulse, scanning amplitude 20-45 mm and distance of treatment 10-30 mm. A strengthened surface layer consists of several sub-layers: at depth of 0.2-0.8 mm - structure of martensite with inclusions of upper bainite, - from 0.8 to 1.8 mm - trosto-martensite structure, - from 1.8 to 2.5 mm - sorbitic-martensite structure, - from 2.5 to 3 mm - sorbite, - over 3 mm - ferrite-pearlite structure of basic metal.
EFFECT: raised efficiency of strengthening process, 3 times increased wear resistance of strengthened working zone of wheel, 3 times reduced probability of development of hydrogen metal brittleness and tendency to brittle fracture.
2 cl, 1 tbl
SUBSTANCE: cooling of working layer of rim during the first 180 sec is performed at discrete increase in flow rate of cooler of 0.0005 to 0.02 l/(cm2/s) by 0.0001 l(cm2/s) every 15-30 sec and the next 120 sec at constant flow rate of cooler to 0.5 l/(cm2/s), and cooling of end surface of rim on the ridge side is performed with air with flow rate of 0.5 m3/(cm2/s); then, wheel is cooled in the air and tempering is performed.
EFFECT: high application properties of railroad wheels owing to improving wear resistance of working layer of wheel rim and mechanical properties of wheel disc; heating to austenisation temperature and differentiated cooling of working layer of rim and its face on the ridge side is performed during 300 s.
1 ex, 2 tbl
SUBSTANCE: hardening is performed at 810-850°C. Tempering is performed at 450-500°C. Then, plasma treatment with plasmotron with energy density of 106-108 W·m-2 is performed. Nitrogen is used as plasma-forming gas. Plasma treatment of tread contact surface and wheel flange surface is performed. Transformer of working flow of plasma-forming gas, which is profiled as to shape of treated surface, is used. Wheel is rotated during treatment about its axis at certain speed. Wheel rotation speed is determined as per ratio n=K·(1/Dw), where n - speed of wheel rotation about its axis, rpm; K - empirical coefficient equal to 20-2000 revolutions·mm/min; Dw - diameter of treated wheel, mm.
EFFECT: increasing strength and thickness of reinforced layer; improving quality and efficiency of plasma strengthening process; simplifying the process diagram of strengthening plasma treatment.
2 dwg, 1 ex
SUBSTANCE: first, wheel is heated for formation of austenite in all sections of a rim and a disk. Then, wheel is cooled for formation of bainite/martensite microstructure in the disk section. Wheel is cooled for formation of bainite/martensite microstructure in the rim inner section. Wheel is cooled for formation of bainite/martensite microstructure in the rim outer section.
EFFECT: providing required mechanical properties of steel and increasing wheel service life.
10 cl, 7 dwg, 1 tbl
FIELD: process engineering.
SUBSTANCE: invention relates to thermomechanical processing of parts and can be used for surface hardening of friction working surfaces of rails and rolling stock wheels. Particularly, it relates to surface hardening of wearing surfaces of parts, primarily, rolling surfaces and railway mounted axle flanges. Strips with modified structure are produced that feature mechanical properties other than those of mother metal. Note here that said strips vary in width and depth over the wheel flange circle.
EFFECT: higher wear resistance, longer wheel life.
1 tbl, 7 dwg, 1 ex
FIELD: process engineering.
SUBSTANCE: invention relates to metallurgy, particularly, to heat treatment of binding bands. Railway bands made of steel containing the components that follow are subjected to heat treatment: C 0.65-0.75 wt %, Mn 0.6-0.9 wt %, Si 0.22-0.45 wt %, Cr 0.2-0.6 wt % and V 0.01-0.03 wt %. Band is heated to austenising temperature and subjected to controlled cooling nu liquid coolant or air-water mix, surface cooling being performed by water with controlled flow rate: 0.00035 l/(cm2·s) for up to 120 s, 0.00075 l/(cm2·s) for 121-150 s, 0.00115 l/(cm2·s) for 151-180 s, 0.00155 l/(cm2·s) for 181-210 s, 0.002 l/(cm2·s) for 211-300 s. Note here that side surface in the band inner diameter is air cooled with flow rate of 0.0003 m3/(cm2·s) with subsequent holding in air and tempering.
EFFECT: higher wear resistance of working play, contraction strains in working ply to 50-60 mm depth from rolling surface.
5 tbl, 1 ex