The key technologies of high-speed EMU axle box bearings are as follows.
①Simulation analysis and digital design of bearing products
Collect and compile the bearing load spectrum of the high-speed EMU, and carry out the operation
Mechanical simulation analysis, product digital modeling, product overall structure optimization design and microstructure optimization design (including rolling body and raceway)
Convexity modification, the contact state between the ball base surface of the rolling body and the rib, each work
surface hardness and roughness matching, etc.).
②Research and development and preparation of bearing steel
Formulate high-speed EMU bearing steel standards and research according to the standards
Development and preparation of high-speed EMU bearing steel to improve resistance to inclusions and carbon
Level of control over chemical content, size, shape, and distribution.
③ Development and preparation of bearing rollers
Research and development supporting high-precision tapered rollers and advanced cylindrical rollers
Manufacturing process and digital equipment and forming production capacity. roller circle
Degree error, reference end face circular runout, reference end face circular R value dispersion,
Gauge Lot Diameter Momentum, Gauge Lot Cone Angular Contact Ball Bearing Angle Momentum (cone only)
Roller), rolling surface roughness, reference end surface roughness up to set
Calculation requirements and a large precision reserve.
④ Development and preparation of bearing cage
Establish steady state analysis model and dynamic analysis model of cage
type, establish the motion equation of the cage and the collision and impact vibration equations,
Study the effect of cage design parameters on its moment of inertia, motion trajectory, motion
Influence law of dynamic stability, impact and shock vibration response. Pass
Determine the reasonable design parameters through the above analysis to ensure the cage
Movement stability and shock resistance.
From mechanical properties, impact strength, water absorption, melting point, size
Material application technology for engineering plastic cages in terms of stability, etc.
Research; develop guidelines for the production, inspection, acceptance and use of engineering plastics cages
The specifications and standards used to form the production capacity of engineering plastic cages.
⑤ Development and preparation of bearing seals
From tensile strength, elongation at break, hot air aging performance,
Hardness Change Rate, Compression Set, Grease Compatibility, Dimensions
Stability and other aspects of the research on the formulation of the raw material rubber for seals and the manufacturing process of the rubber.
R & D design Low friction torque, waterproof, dustproof, leak-proof grease, low temperature
The sealing structure that is conducive to the circulation and lubrication of grease; at the same time, the research on rubber
The vulcanization bonding technology of rubber and metal surface treatment technology ensure the
The bonding quality of glue and metal increases the service life of seals.
Develop rules to guide the production, inspection, acceptance and use of seals
Ranges and standards to form the production capacity of the seals.
⑥Research and development and preparation of bearing grease
On the basis of tribological research, study the bearing lubrication state,
Oil film thickness, evolution of contact area, dynamic development of friction and wear
For the sake of regulation, research and develop high-efficiency lubrication suitable for high-speed EMU bearings
Grease, the lubricating conditions for the safe operation of the bearing.
Formulation of technical specifications for efficient grease production, testing and application
Fan. Completed the research on bearing lubrication condition monitoring and fault diagnosis technology
send . Creates production capacity for high-efficiency greases.
⑦Set up a demonstration production line for trial production of bearing samples
Set up a demonstration production line to produce sufficient quantities for inspection,
Samples for testing, bench testing, and vehicle loading.
⑧ Bearing bench test
Develop durability test, waterproof seal test, dust seal test
Test and comprehensive performance test specifications and carry out corresponding performance tests.
⑨ Formulation of bearing product standards
Vigorously promote and actively participate in high-speed EMU bearings
The formulation of railway industry standards.