34 results about "Rolling contact fatigue" patented technology

The invention discloses a silicon nitride ceramic formula and a preparation process of a bearing roller matched with the silicon nitride ceramic formula, belongs to the technical field of ceramic materials, and aims to solve the problem of rolling contact fatigue failure caused by insufficient fracture toughness and microscopic crack propagation of an existing silicon nitride bearing roller under high-speed and heavy-load working conditions. The core formula of the invention comprises an alpha-Si3N4 matrix, a composite rare earth additive, a nano TiC modifier and an MgO heat conduction enhancer. The fracture toughness and fatigue resistance of the material are remarkably improved through process nano powder ultrasonic pre-dispersion, closed nitrogen circulation spray granulation, two-step air pressure sintering and cryogenic-thermal tempering gradient stress treatment.

The present application belongs to the field of rail material research and manufacturing, and specifically discloses a rail structure for a subway humid environment. According to the distribution of pearlite lamellar spacing, the rail head cross-section structure can be divided into cap layer 1, cap layer 2, cap layer 3 and base material layer. The pearlite lamellar spacing distribution of cap layer 1 is 130-150 nm, the pearlite lamellar spacing distribution of cap layer 2 is 90-120 nm, the pearlite lamellar spacing distribution of cap layer 3 is 140-170 nm, and the pearlite lamellar spacing distribution of the base material layer is 200-230 nm. The present application designs cap-shaped structures with different depths and different pearlite lamellar spacing in the rail head. By accelerating the cooling speed of the heat treatment of the hot-rolled rail in different stages, the reasonable gradient structure distribution of the pearlite structure of the rail material is realized, the expansion speed of the rolling contact fatigue crack of the rail in the humid environment to the internal material is effectively slowed down, the rolling contact fatigue damage is reduced, and thus the comprehensive performance and service life of the rail are improved.

The invention discloses a safety wheel for a rubber wheel metro vehicle bogie and a preparation method of the safety wheel. The wheel comprises the following chemical components in percentage by mass: 0.52%-0.60% of C, 0.30%-0.40% of Si, 0.70%-0.80% of Mn, less than or equal to 0.015% of P, less than 0.010% of S, 0.20%-0.30% of Cr, 0.05%-0.23% of Ni, 0.04%-0.06% of V, (60-80) * 10 <-4%) of N, less than or equal to 0.012% of Al, less than or equal to 0.005% of Ti and the balance of Fe and inevitable impurities. The composition proportion of N and Al is controlled by adjusting C and adding V, so that the volume fraction of the tread ferrite reaches 5-12%, and the volume fraction of the rim reaches 10-16%; meanwhile, the metallurgical quality is controlled, the proportion of plastic inclusions is larger than or equal to 90%, the proportion of the size below 10 micrometers is larger than 85%, and the wrapping rate is larger than or equal to 80%. And finally, the average value of the fracture toughness of the wheel is larger than or equal to 85 MPam1 / 2, the unit value is larger than or equal to 80 MPam1 / 2, the rolling contact fatigue resistance is remarkably improved, and the cracking risk of large-size inclusions is reduced.

The application discloses a wheel fatigue life prediction method based on a rolling contact fatigue simulation technology, and comprises the following steps: establishing a finite element model of a wheel-axle-rail, performing grid encryption on a wheel-rail contact area, and performing static strength checking to obtain an initial finite element model meeting static force requirements; establishing a wheel-rail rolling contact model based on the initial finite element model, describing rolling motion of the wheel by using a hybrid Lagrangian / Eulerian description or a co-rotating coordinate system, and applying a wheel non-circularity excitation spectrum in explicit dynamics analysis to calculate a dynamic contact stress field under different axle loads and friction coefficients; and based on the dynamic contact stress field, a multi-axle fatigue damage model is used in combination with a linear cumulative damage criterion to calculate fatigue life, and an abrasion correction coefficient and a residual stress correction coefficient are introduced to correct the calculation results. The application significantly improves the prediction accuracy of fatigue defects such as wheel peeling, cracking and polygonization.

The application provides a laser impact combined surface modification method for a bearing raceway surface, a pre-processing raceway region and a retainer matching surface, the raceway region reserving a processing allowance layer; a constraint layer is applied to the raceway region; the raceway region is micro-scale laser impact strengthened for at least 3 times without an absorption protective layer, a deep and uniform plastic strengthening layer is formed; the processing allowance layer is removed; an absorption protective layer is attached to the retainer matching surface; and array-arranged oil storage pits are formed on the retainer matching surface through laser impact forming. The method can form a plastic strengthening layer on the raceway region surface through micro-scale laser impact strengthening, can significantly improve the rolling contact fatigue performance and wear performance of the bearing, and can form oil storage pits on the retainer matching surface through laser impact forming, the oil storage pits can lock lubricating oil through the surface tension of the oil, and the problem of insufficient lubrication of the bearing raceway surface is solved.

This invention discloses a rapid prediction method for rail rolling contact fatigue damage in the field of rail damage prediction technology. The method includes establishing a three-dimensional elastoplastic wheel-rail cyclic rolling contact finite element model, improving the cyclic plastic constitutive model, and simulating the stress-strain evolution of the rail. A rail stress-strain sample library is generated through parametric sampling and batch calculation. A Physically Constrained Generative Adversarial Network (PC-GAN) is constructed, embedding physical constraints such as contact force conservation and energy consistency into the loss function to achieve rapid and high-precision mapping from operating parameters to the stress-strain field. Based on the PC-AN prediction results, cumulative damage and fatigue life are calculated using an incremental multiaxial fatigue damage model, and a damage distribution map of the entire rail line is drawn, identifying high-risk sections. This invention deeply integrates physical modeling with intelligent algorithms, achieving an order-of-magnitude improvement in rail fatigue damage assessment efficiency while ensuring prediction accuracy, providing efficient and reliable technical support for rail life assessment and maintenance decisions across the entire rail line.

The invention provides the application of the test method in testing the rolling contact fatigue performance of the steel rail material in a humid and / or corrosive environment. The invention also provides a test method for testing the rolling contact fatigue performance of the steel rail material, which comprises the following steps: preparing a steel rail test sample, simulating a humid and corrosive environment, and carrying out a double-wheel rolling contact fatigue test according to test requirements; and evaluating the contact fatigue performance of the sample through weightlessness, vibration signals and the surface state of the sample. The test mode better conforms to the actual service condition of the steel rail line in the humid and corrosive environment, and the test result is more accurate and effective. The steel rail material rolling contact fatigue test method provided by the invention can evaluate the contact fatigue performance of multi-steel-grade steel rails in a humid and corrosive environment, and parameters such as corrosive liquid and test pause interval time can be adjusted according to actual requirements. The method is suitable for test evaluation of various service conditions such as coastal, tunnel and plateau, and has a good application prospect.

The invention relates to the field of rolling linear guide rail treatment, and discloses an inertia-driven self-adaptive lubricating rolling linear guide rail which comprises a sliding rail piece, a vertical plate is arranged on the left side of the top of the sliding rail piece, a sliding rod piece is arranged on the right side of the vertical plate, and a sliding block assembly is arranged on the surface of the sliding rod piece. And the sliding block assembly is slidably connected to the surface of the sliding rail piece, a sliding assembly is arranged in the sliding block assembly, and an inertia adjusting assembly is arranged in the sliding block assembly. According to the device, the inertia adjusting assembly is arranged, inertia force generated in the sliding process of the sliding block assembly can push the sliding part to move on the surface of the limiting sliding rod in the sliding direction of the sliding block assembly, the inertia force in the moving process can make oil permeate, and the sliding part and the oil storage part on the front face can transversely move; and the top is provided with an assembly capable of supplementing oil, so that the oil can seep during radial movement, and the wear rate of the raceway is reduced.

The invention discloses a moderate-strength contact-fatigue-resistant bainite steel rail and a preparation method thereof, and belongs to the technical field of steel rail preparation. The steel rail comprises the following chemical components in percentage by weight: 0.22%-0.26% of C, 1.00%-1.20% of Si, 1.25%-1.45% of Mn, 0.25%-0.6% of Cr, 0.2%-0.4% of Mo, 0.025%-0.040% of Nb, less than or equal to 0.015% of P, less than or equal to 0.010% of S and the balance of Fe and inevitable impurities. The moderate-strength contact fatigue-resistant bainite steel rail for the freight railway curve line is prepared by combining low-cost alloy component design with a controlled cooling process, so that the rolling contact fatigue resistance of the steel rail is improved while the strength and the toughness of the steel rail are ensured; and in the using process, abrasion and rolling contact fatigue damage can be effectively controlled, the service life of the steel rail is remarkably prolonged, and the grinding and maintaining cost of the steel rail is reduced.

The application relates to the field of material service behavior evaluation, in particular to service behavior evaluation of ceramic balls in high-end bearings, and more specifically to a ceramic ball rolling contact fatigue performance testing device and testing method simulating the structure and lubrication of an angular contact ceramic ball bearing. The device comprises a fixing plate, a stand, a limiting plate, an upper thrust bearing, a lower thrust bearing, an upper conical ring base, a lower conical ring base, an upper conical ring, a lower conical ring, a retainer, a bearing steel rod and ceramic balls. According to the diameter size of the ceramic balls to be tested, the geometric relationship of the ball-rod contact is designed and calculated, the rotating speed and the contact stress are determined; according to the selected contact stress and the fatigue cycle of the trial test, the cut-off value of the constant cut-off test is determined; the rolling contact fatigue test is carried out on the ceramic balls to be tested, and the contact fatigue performance of the ceramic balls is evaluated. The application can evaluate ceramic balls of different diameter sizes without special sample preparation, so that the ceramic balls in actual bearings can be directly tested.

The invention provides a method for testing rolling contact fatigue of a steel rail material. The method comprises the following steps: preparing a plurality of steel rail test samples and grinding accompanying samples; carrying out ultrasonic cleaning on the test sample and one accompanying grinding sample by using anhydrous B, airing and then mounting on a rolling contact fatigue testing machine; the grinding accompanying sample rotates at a certain rotating speed, the test sample is fixed and does not rotate, and after the test sample makes contact with the grinding accompanying sample for a certain time under a certain load, the test sample is separated from the grinding accompanying sample, and scratches are made; carrying out ultrasonic cleaning on the test sample and another grinding accompanying sample by using absolute ethyl alcohol, weighing and recording the test sample after airing, and carrying out a rolling contact fatigue test on a rolling contact fatigue testing machine; after the test reaches a required test cycle, stopping the test, recording a vibration signal, and taking down a test sample and an accompanying grinding sample; ultrasonically cleaning the test sample by using anhydrous B, airing, weighing and recording; and subtracting the weight after the test from the weight of the test sample before the test to obtain the weight loss. The method can accurately evaluate the rolling contact fatigue test under the condition that the surface of the steel rail is scratched.

This invention discloses a method for determining the parameters of wheel-rail rolling contact fatigue damage function that considers the microscopic contact solution within the contact patch, is applicable to different railway systems, and has good predictive performance. The method includes the following steps: solving for transient wheel-rail contact state parameters; calculating the macroscopic rolling contact solution and the microscopic contact solution within the contact patch; and solving for the transient wear number Tγ and the total transient damage value D within the contact patch at any given time. t and peak transient damage value h m Solve for the local wear coefficient τγ within the contact patch. L ; with h m As τγ L d L , thus obtaining τγ L with h m The corresponding relationship; by changing the working conditions, Tγ and τγ covering the entire domain of the macroscopic damage function model under different traction coefficients are obtained. L The relationship between them; for τγ at the critical point L The reduction is calculated based on the wear reduction until the total local damage value d within the corresponding contact patch is reached. t Total transient damage value D within the contact patch t Equal to each other, we obtain the reduced τγ L With d L The relationship is as follows: the parameters of the local damage function model are obtained by fitting and / or the parameters of the macroscopic damage function model of another railway system are derived by reverse calculation.

The invention discloses a method for evaluating the dispersion degree of a bearing fatigue life by quantizing an uncertain interference fit parameter, and the method comprises the following steps: 1, analyzing the uncertain interference magnitude in a shaft-hole interference fit model based on a Chebyshev interval method, and obtaining an interpolation point; step 2, combining a quasi-statics model of the angular contact ball bearing based on the no-raceway control hypothesis with a shaft-hole interference fit model, and determining ball-raceway contact forces under different interference magnitudes corresponding to the interpolation points; and Step 3, analyzing the values of the ball-raceway contact forces under different interference magnitudes corresponding to the interpolation points in a ball-raceway rolling contact fatigue life model to obtain the maximum Von-Mises stress and the corresponding position depth, and quantifying the influence of uncertain parameters on the dispersion degree of the bearing life. According to the method, the specific influence of the uncertainty interference fit parameters on the bearing fatigue life dispersion degree under different working condition parameters can be considered.

The invention relates to a production method of high-carbon bearing steel for a spindle bearing of a high-rotating-speed precision machine tool, and belongs to the field of metallurgy. The process production of KR molten iron pretreatment, converter smelting, converter tapping, LF refining, vacuum degassing and continuous casting is adopted, the whole process collaborative optimization design is adopted, all process control targets are deeply coupled, KR ultra-low sulfur (less than or equal to 0.004%) lays a foundation for low-oxygen and low-sulfur smelting, LF and RH efficient refining is guaranteed through converter accurate end point control (C / P / temperature three elements), and the low-oxygen and low-sulfur low-oxygen and low-sulfur low-oxygen and low-sulfur low-oxygen and low-sulfur low-oxygen and low-sulfur low-oxygen and low-sulfur low-oxygen and low-sulfur low-oxygen The continuous casting electromagnetic stirring and soft reduction technology synergistically improves homogenization, the steel oxygen content is smaller than or equal to 5 ppm, the sulfur content is smaller than or equal to 0.006%, the calcium content is smaller than or equal to 5 ppm, the titanium content is smaller than or equal to 9 ppm, the center porosity is smaller than or equal to 1.0 level, the center segregation is smaller than or equal to 1.0 level, the B fine inclusion is smaller than or equal to 1.0 level, the B coarse inclusion is smaller than or equal to 0.5 level, the DS inclusion is smaller than or equal to 0.5 level, the macroscopic purity is smaller than or equal to 3 mm / dm < 3 >, and the rolling contact fatigue rated life L10 under the contact stress of 4.5 GPa is 2.38 * 107 and is 1.2 times or above that of a die casting material.

The invention relates to a method for screening multiple supporting rollers based on sliding-rolling coupling, belongs to the technical field of performance detection of core parts of wide and thick plate rolling equipment, and solves the problem that the screened supporting rollers are not suitable for application scenes due to the lack of effective evaluation standards of the supporting rollers in the prior art. The screening method comprises the following steps: pretreating a plurality of samples of a plurality of supporting rollers to obtain a first number of sliding test samples and a second number of rolling test samples corresponding to each supporting roller; obtaining sliding wear data of each supporting roller based on a reciprocating sliding friction wear test; based on a ball disc type rolling contact fatigue test, rolling contact fatigue failure data of each supporting roller is obtained; and according to the sliding wear data and the rolling contact fatigue failure data of each type of supporting rollers, screening the multiple types of supporting rollers to obtain the optimal type of supporting rollers. And the scene adaptability of the screened supporting roller is improved.

The invention discloses a device and method for a rolling contact fatigue corrosion test, and belongs to the technical field of fatigue corrosion tests.The device comprises a liquid corrosion liquid supply mechanism, and the liquid corrosion liquid supply mechanism is installed in a testing machine and used for creating a corrosion environment in the testing machine; the sensor group is arranged in the testing machine and is used for detecting the environment in the testing machine; and the microcontroller is respectively connected with the liquid corrosion liquid supply mechanism and the sensor group. According to the invention, the complex corrosion condition of alternation of wetting and drying in the ring / ring rolling contact fatigue corrosion environment is truly simulated.

The invention discloses a steel rail material for a subway small-radius curve line, and the rail head area of the cross section of a steel rail is divided into three areas according to different microsizes of pearlite structures, namely a surface regulation and control layer, a rail angle hardening area and a core base body area. Aiming at more small-radius curves of the subway line at present, the microstructure of different stressed parts of the steel rail head is reasonably designed and arranged on the basis of the wheel-rail contact relation and stress distribution characteristics of the small-radius curve line, so that the steel rail material rail head is ensured to have the wear and the surface contact fatigue crack cooperative control, and meanwhile, the steel rail material rail head is ensured to have a good anti-fatigue effect. And the generation and development of internal fatigue cracks can be reduced. Meanwhile, gradient distribution and stable control of pearlite structures of different parts of the rail head of the steel rail are achieved by controlling rolling and conducting accelerated cooling at different speeds on the rail head, and generation and development of steel rail abrasion and rolling contact fatigue damage on a small-radius curve line are effectively relieved; the comprehensive use performance and the service life of the steel rail are improved.

The present invention relates to the technical field of wheel-rail tribology and discloses in particular a prediction method for rolling contact fatigue damage of wheel / rail materials based on various evaluation indicators. This method comprises the following steps: performing a wheel-rail rolling contact fatigue simulation test based on a wheel-rail stability diagram to determine the damage state and the stability limit curve equation of wheel / rail materials with different shear yield strengths under different contact parameters; calculating the importance and relative weighting of various evaluation indicators based on roughness quantity theory; and creating an integrated evaluation indicator cloud model to calculate the association of the attribute values ​​of the indicators to be evaluated with different damage states.Evaluating and predicting a rolling contact fatigue damage condition using the maximum value rule; performing a check against the attribute value of the integrated evaluation indicator, and determining the prediction results of the rolling contact fatigue damage condition for selected wheel and rail material under the conditions to be predicted. The method according to the present invention relies solely on existing technical data, which can significantly reduce the subjectivity of the damage condition prediction process.

The application relates to the field of service behavior research of machine tool bearing materials, in particular to a method for testing the rolling contact fatigue performance of GCr15 bearing steel used for manufacturing high-speed ceramic hybrid bearings. The testing method simulates the actual high-speed ceramic hybrid bearing material, and corresponding GCr15 bearing steel and ceramic rolling body material are selected. The bearing steel to be tested is processed into a bearing steel rod sample with a diameter of 12 mm and a length of 120 mm, and the ceramic rolling body material is processed into a ceramic ball with a diameter of 12.7 mm. A ball-rod type rolling contact fatigue test is carried out, and the contact fatigue life of the bearing steel is estimated by using the fixed number of cut-off method. The contact stress cycle cut-off value can be set as 2*10 8 , the contact stress value is 5 GPa, and the rotating speed of the bearing steel rod is 5000 rpm. The testing method of the application is close to the service working condition of the actual machine tool ceramic hybrid bearing, and can more reliably evaluate the rolling contact fatigue life of the bearing steel.

The invention belongs to the technical field of metal rolling production, and particularly relates to a roller fatigue damage calculation method considering contact fatigue damage and wear coupling, which comprises the following steps of: 1, constructing a roller material continuous damage mechanical model, 2, constructing a roller contact fatigue damage calculation model, and 3, calculating unit damage. The method comprises the following steps of 1, dividing roller service time intervals, 2, dividing roller service time intervals, 4, constructing a roller material abrasion loss calculation model, 5, determining an abrasion coefficient through'strength-hardness' association, 6, calculating unit abrasion, and 7, carrying out iterative calculation: carrying out roller body discretization, initial parameter assignment and iterative parameter setting in sequence, and then calculating unit abrasion according to the divided roller service time intervals. And carrying out iterative calculation in the intervals one by one, and carrying out iterative calculation to obtain coupling contact fatigue damage and worn roller fatigue damage in a complete on-machine service cycle. According to the method, the problems of excessive model simplification and neglected coupling effect in an existing evaluation method are solved, and the calculation precision of roller damage distribution is improved.

The invention discloses a small-proportion wheel-rail rolling contact fatigue testing machine, and belongs to the technical field of experimental equipment. The device comprises a machine table, a servo driving assembly, a gear transmission assembly, a reciprocating motion assembly, a loading contact assembly, a periodic lifting mechanism and a plurality of groups of measuring assemblies, the servo driving assembly synchronously drives the reciprocating moving assembly and the periodic lifting mechanism through gear transmission, the reciprocating moving assembly drives the small-proportion steel rail sample to move in a reciprocating mode, and the loading contact assembly enables the small-proportion wheel sample to make contact with the small-proportion steel rail sample through weight loading. The periodic lifting mechanism is matched with the reciprocating motion frequency to periodically lift the small-proportion wheel sample, so that the one-way rolling contact simulation of the two is realized; the measuring assembly can synchronously obtain parameters such as friction force, pressure, moving speed and wheel speed. The problem that the effect of simulating one-way rolling contact by existing equipment is poor is solved, experimental data are closer to reality, and the persuasion and reliability of a test result are improved.

The present application relates to a kind of long-life automobile water pump shaft bearing steel and its production method, belong to the field of iron-based alloy, the element composition weight percentage of steel is as follows:C:0.80~0.90%, Si:0.65~0.85%, Mn:0.20~0.40%, P:≤0.020%, S:≤0.010%, Cr:1.60~1.70%, Ni:0.40~0.50%, Mo:0.30~0.40%, Al:≤0.050%, rare earth La:0.0010%~0.0020%, Ti:≤0.0020%, Ca≤0.0010%, O:≤0.0010%, the balance is Fe and unavoidable impurities.The production process of steel is as follows:electric furnace or converter initial smelting-external refining-VD or RH vacuum degassing-continuous casting-continuous rolling-normalizing-finishing-punching into warehouse.The metallographic structure of steel surface layer is ferrite+pearlite structure, and the metallographic structure of core is cementite+pearlite.The rolling contact fatigue rated life of steel under 4.5GPa contact stress is more than 5*10 7 ​

The invention provides rolling contact damage resistant nano ceramic particle reinforced train wheel steel and a preparation method thereof, and belongs to the technical field of preparation of train wheel steel. According to the steel for the wheel, Al powder, Ti powder and multi-walled carbon nanotubes are mixed to obtain mixed powder, and TiC / Al intermediate alloy is prepared through ball milling, cold press molding and hot press sintering; the TiC / Al intermediate alloy is crushed into alloy chippings, the alloy chippings are placed at the bottom of a steel ladle, molten steel of the wheel steel is tapped to the steel ladle, and the wheel steel is obtained after vacuum degassing refining, continuous casting, forging and heat treatment. The introduction method of the TiC / Al intermediate alloy carrier is adopted, the problems of particle aggregation, segregation, floating or sedimentation and the like caused by poor wettability and density difference when nanoparticles are directly added are effectively avoided, and the rolling contact damage resistance of the wheel steel is improved by introduction of the TiC / Al intermediate alloy carrier; and the high-performance requirements of modern rail transit on the steel for the wheels are met.

The application provides a laser shock combined strengthening process for improving bearing contact fatigue performance, first, a machining allowance layer is reserved on the raceway surface of the bearing; then a protective layer is attached; then large-spot laser shock is performed to form a first plastic strengthening layer; further micro-scale laser shock is performed to form a second plastic strengthening layer on the superficial layer of the first plastic strengthening layer; finally, the reserved machining allowance layer is removed. The process forms a large-depth first plastic strengthening layer on the surface of the raceway area through large-spot laser shock, and on this basis, a relatively shallow second plastic strengthening layer is formed on the surface through micro-scale laser shock, the secondary strengthening can improve the performance of the strengthened area, and more importantly, the smoothness and plastic deformation uniformity of the plastic strengthening layer can be optimized; then the strengthened area is removed and polished by a certain thickness to ensure that the smoothness of the raceway surface meets the relevant technical requirements, thereby finally significantly improving the rolling contact fatigue performance of the bearing.

The invention relates to a vacuum carburized gear, an engine unit having the same, and a saddle type vehicle. The present teachings are directed to providing a vacuum carburized gear in which wear resistance, rolling contact fatigue strength and productivity of the gear are improved while reducing carbon dioxide emissions during manufacturing. The vacuum carburized gear (1) is configured as follows: (a) the gear is made of a standard material or a standard material containing Mn and Mn and at least one of Cr, Mo, Si or Ni in a region having a depth of 10 [mu] m or less in a direction perpendicular to the surface of the gear (1); and (b) the Mn concentration is maintained in a region having a depth greater than 10 [mu] m and less than 15 [mu] m in the direction perpendicular to the surface. The gear 1 is used without the vacuum carburized tooth flank thereof being subjected to grinding or polishing.

The application provides a rail rolling contact fatigue crack array detection probe based on alternating electromagnetic field, which comprises a rail, a detection probe, a shock absorber, a probe clamp and a fixing device. The detection probe comprises a special-shaped excitation module, an array sensor group and an amplification circuit. The special-shaped excitation module is adaptively designed according to the geometric shape of the rail to generate an induced current perpendicular to the crack, and the induced current has high strength and high uniformity. The array sensor group is designed in an arc shape according to the shape of the rail to completely cover the gauge angle. The shell of the detection probe is designed in a profiled shape for the rail to completely match the surface profile of the rail. The shock absorber is used to ensure that the distance between the detection probe and the surface of the rail is constant to prevent damage to the detection probe. The rail rolling contact fatigue crack array detection probe provided by the application has simple detection method, can completely cover the gauge angle in single detection, has high detection efficiency and detection precision, and can further realize surface profile imaging of rail defects.

The present application belongs to the technical field of metal rolling production, and particularly relates to a rolling fatigue damage calculation method considering coupling of contact fatigue damage and wear. The method comprises the following steps: step one, constructing a continuous damage mechanics model of rolling material; step two, constructing a rolling contact fatigue damage calculation model; step three, calculating unit damage; step four, constructing a wear amount calculation model of rolling material; step five, determining a wear coefficient through "strength-hardness" correlation; step six, calculating unit wear; and step seven, iterative calculation: after rolling body discretization, initial parameter assignment and iterative parameter setting are sequentially performed, iterative calculation in each interval is carried out according to the divided rolling service time interval, and a complete rolling fatigue damage of coupling contact fatigue damage and wear in a complete in-service period is iteratively calculated. The method solves the problems of excessive model simplification and ignored coupling effect in the existing evaluation method, and improves the calculation accuracy of rolling damage distribution.

The invention provides a steel rail material rolling contact fatigue test method. A rolling contact fatigue test sample and a rolling accompanying grinding sample are machined on a steel rail head; carrying out laser engraving on the surface of the test sample to simulate a hurt in a required shape and depth; performing ultrasonic cleaning on the test sample and the grinding accompanying sample by using anhydrous B, drying, weighing and recording, performing a rolling contact fatigue test, and setting the test load, the rotating speed of the test sample and the grinding accompanying sample and the total test cycle according to test requirements; after the required test cycle is reached, stopping the test, recording a vibration signal, and taking down the test sample and the accompanying grinding sample; and ultrasonically cleaning the test sample by using anhydrous B, airing, weighing and recording. And subtracting the weight after the test from the weight of the test sample before the test to obtain the weight loss. The contact fatigue performance of multi-steel-grade steel rails under the condition that the multi-steel-grade steel rails are damaged can be evaluated, and the size, the shape and the depth of the engraved marks can be adjusted according to actual requirements; the method is suitable for test evaluation of various service conditions of high-speed, heavy-load and ordinary-speed railway steel rails and the like, and has a good application prospect.

The invention relates to the technical field of mechanical part fatigue testing, and discloses a rolling contact fatigue test bed monitoring system and method for wireless power transmission, and a test bed is provided with a wireless power transmission transmitting end circuit board; the wireless electric energy transmission transmitting end coil is arranged on the wireless electric energy transmission transmitting end coil support, and the end face of the wireless electric energy transmission transmitting end coil support is provided with an end cover. The receiving disc is arranged on the end cover, a test roller is arranged on the receiving disc, and a temperature sensor is arranged on the test roller; the testing device is arranged on the side surface of the receiving disc; the testing device comprises a circuit board, a wireless electric energy transmission receiving end coil and a vibration sensor arranged on the circuit board, the wireless electric energy transmission receiving end coil, the vibration sensor and the temperature sensor are all electrically connected with the circuit board, and the wireless electric energy transmission receiving end coil is electrically connected with the wireless electric energy transmission transmitting end coil; the device can continuously work and record the temperature and vibration of the tested roller, and has a good application prospect and a wide application range.

The invention belongs to the field of metal material surface strengthening, and relates to a surface wear resistance and rolling contact fatigue protection method of a metal transmission component, in particular to a method for prolonging the service life of a bearing by forming an oxide layer on the surface of the metal bearing. The method comprises the steps of metal surface grinding, polishing treatment, cleaning and drying. Lubricating oil containing additives is used; a dense micro-convex oxide layer is formed, and the oxide layer is composed of a metal oxide containing a large number of fine metal particles. The method can be carried out in the using process of the bearing, the cyclic contact stress damaging the surface of the bearing is converted into a method for strengthening the surface of the bearing, the rolling contact fatigue performance of the bearing is improved, the service life of the bearing is prolonged, and the method can be widely applied to various bearings.