Our products are widely used in toy cars, mahjong machines and so on. Hot selling domestic plastic steel market plastic wheel. Our company values reputation, abides by the contract, guarantees the product quality, welcome the casting production from all walks of life friends and our company to negotiate business. Problems to be solved urgently: product design of second-generation self-aligning roller bearings, design of grinding tooling, equipment selection, quality control and testing, etc. Product life requirement K≥12, existing product standards are not consistent with this. Company has machining, cold mound machine, carburizing and quenching 5 production lines, the existing staff of 60 people, for the village and the surrounding schiscosomiasis 100 households farmers processing installation of miniature bearing, drive more than 300 rural surplus labor took to the road of the rich, consecutive years by the county, the county government awarded "star enterprise casting production line industry", "to get rich is pacesetter" and "leader". It produces 30 million bearings every year, realizing an output value of 25 million yuan and creating a profit of 3 million yuan. 2) Ultra-high speed feed movement system. The multi-dimensional system runs at a speed of tens of meters per minute, forming an ultra-high speed feed system with complex trajectory and high precision. There are two prominent difficulties: one is to minimize the inertia of motion; The second is to make the CNC servo system with high speed, precision tracking performance. ● Problems to be solved :(1) Ultra-high speed and high power active system. Because the main movement needs to have tens of thousands of RPM or even tens of thousands of RPM speed and tens of kilowatts of output power, and the size of its structure is very strict. Such measures are unlikely to have the desired effect. According to the experience of foreign small castings, the use of internal chain drive, which involves armature design, motor cooling, AC frequency modulation system, ultra-high speed bearings, bearings special lubrication, cooling and sealing, balance spindle adjustment, reliable tool loading and unloading, spindle state parameters monitoring and other issues.