NILES gear grinding machine is a shaping gear grinding machine imported from Germany, which is mainly used to process gearbox gears on high-speed railway, motor train, wind power and subway vehicles. The gear grinding machine is one of the last important processes of gearbox gear processing. The quality of gear grinding precision is related to the processing quality of gear products and the transmission precision after the gearbox assembly.
The complete use of high-precision equipment is the guarantee of the quality and accuracy of gear products. The rotation accuracy of the grinding wheel spindle is the key factor that directly affects the machining accuracy of the gear grinding surface. However, the high-speed operation of the grinding wheel spindle for a long time will generate a lot of heat. If the heat control is not good, the rotation accuracy of the grinding wheel spindle will be reduced, and the spindle bearings and internal parts will be directly damaged in serious cases. At present, the grinding wheel spindle needs to be repaired every year due to poor heat dissipation. From 2016 to 2018, there were 7 grinding wheel spindle repairs, and the repair cost reached 225000 yuan. For many years, manufacturers have been monopolizing the repair technology of such equipment, so how to effectively cool the grinding wheel spindle, better ensure the spindle accuracy and extend its service life is an urgent problem to be solved.
- Analysis of cooling structure before transformation
- Design calculation of cooling system
Determine the main parameters of the cooling system: the main parameters of the cooling system are pressure and flow, and select the appropriate cooling pump according to the cooling pressure of the original machine tool. - Structural analysis after reconstruction
conclusion
Through analysis and calculation, the cooling system of the spindle motor of NILES series gear grinding machine is reformed and explored. The reformed cooling system can independently cool the spindle motor, avoiding the phenomenon of pipeline blockage caused by long-term use, motor damage, and unstable grinding caused by reduced accuracy, making the machine run more smoothly and extending the service life. Now the gear machining accuracy can reach 0.005 mm stably, which effectively ensures the safe operation of various high-speed train gears, and greatly reduces the downtime. The normal service life of the original spindle is 4-6 years, which is expected to be extended by 3-5 years after the transformation. It is estimated that the maintenance cost of the spindle motor can be saved by 120000 yuan annually. This design has been applied for the national utility model invention patent, and can be popularized and transformed on the similar NILES imported gear grinding machines in the future to realize all localization.
