Laser Strengthening Method for Train Wheel Combination

Abstract

The invention discloses a train wheel combined laser reinforcement method. According to the method, wheel treads are subjected to laser reinforcement, and wheel non-tread areas are also subjected to laser reinforcement; and when wheel treads are subjected to laser reinforcement, driving wheels are subjected to tackifying reinforcement, and trailer wheels are subjected to viscosity reduction reinforcement. With the method provided by the invention, reinforced wheels have good compatibility with rail abrasion, reinforcement lives of wheel treads match those of wheel non-tread areas, wheel service life is long, and wheel reliability is high. When a train adopts the wheels reinforced by using the method provided by the invention, a traction drive capability is high, and running energy consumption is low.

Description

technical field [0001] The invention relates to the technical field of train parts and laser processing tissues. Background technique [0002] The wheel is a key component related to the economy, safety, ride comfort and environmental noise of the train. It is assembled with the axle, bearing and other components to form a wheel set. Under the action of the complex wheel-rail rolling contact impact force, there will be an impact , sliding noise and other environmental problems; the tread part is subjected to complex rolling contact fatigue loads, and damage problems such as peeling and abrasion occur; while the non-tread parts are subjected to complex three-dimensional alternating fatigue loads, showing fatigue cumulative damage problems. At the same time, in order to improve the comprehensive running performance of trains, strict technological requirements of low quality, low noise, long life, high reliability and safety are put forward for the wheels. [0003] According t...

AI Technical Summary

Problems solved by technology

However, the failure mode of the wheel tread is the wear failure of the part in contact with the track, which is the result of the cumulative rolling contact fatigue damage and has the characteristics of subsurface damage; without considering the strengthening of the maximum peeling shear stress range of the subsurface, the subsurface peeling cannot be effectively eliminated Damage, so its strengthening effect is poor

[0009] 2. The problem of scientific strengthening methods for non-tread parts

[0010] The failure form of the non-tread part of the wheel is fatigue fracture failure, which is the cumulative damage result of complex three-dimensional alternating fatigue stress. The scientific strengthening method that conforms to the failure physical mechanism is to suppress the initiation of fatigue cracks, and the suppression index needs to be scientifically determined according to the damage control requirements. Now There is a local laser cladding repair method for the wheel web hole, the principle is not to inhibit the initiation of fatigue cracks, but to enhance the local fatigue strength, which will transfer the weak parts of the wheel, and the enhanced local fatigue strength is not the fatigue strength of the wheel

[0011] 3. The matching problem between tread strengthening life and non-tread strengthening life

However, to achieve this purpose, the existing methods cannot be achieved naturally, and it must be realized through scientific experiments, calculations and analysis.

[0013] 4. Wheel strengthening and train operation traction expansion and energy saving

This shows that scientific wheel tread reinforcement has different requirements from the perspective of traction expansion and energy saving in train operation, depending on its service function. The existing strengthening methods have not noticed this point, and cannot naturally achieve this goal.

[0015] Therefore, the existing wheel tread strengthening methods are not combined with scientific strengthening depth, matching with track wear performance, expansion of traction capacity or energy saving; the strengthening methods of non-tread parts are not matched with scientific anti-fatigue fracture mechanism. Fortified life also did not match that of wheel treads