The main shaft system transmission mode. The main shaft system is used in the traditional way of gear transmission. Through the gear as the intermediate link, not only has the vibration and the noise big shortcoming, but also increases the rotational inertia, in this kind of situation is difficult to improve the spindle speed greatly.
Traditional main shaft bearing low speed. The main shaft bearings used in the domestic products are precision rolling bearings with working load as the design parameters, the most commonly used angular contact ball bearings. This kind of bearing in the 400r/min the following work, as long as the strict calculation of the amount of grease, automotive lubricants can meet the work requirements. But as to further improve the speed, due to the bearing steel ball will produce large centrifugal force, pressure in the bearing ring raceway on, resulting in high temperature and reduce the service life of the bearing. Therefore, this kind of bearing can not meet the requirements of high-speed spindle.
Cooling water cooling screw set and lubrication. The original machine tool spindle is often operated under high speed, continuous and long time conditions, and the cooling measures must be taken, and the bearing should be well lubricated at the same time. Domestic products are basically the use of natural cooling, grease lubrication. The lubrication mode is simple, does not require additional equipment, but for speed is low, also by adopting a special cooling measures, to further improve the spindle speed difficult.
Low dynamic balancing of tool holder reliability. Experiments show that when the circumferential speed of the spindle taper hole is 30-4Om/s, the centrifugal force will enable expansion of taper hole diameter, significantly reduced tool spindle and the contact area, thereby reducing the shank of the contact stiffness and is not safe. At this time, we should enhance the reliability of the cutting tools and consider the dynamic balance of the high speed spindle.
SKF BEARINGS FAG BEARINGS INA BEARINGS TIMKEN BEARINGS NSK BEARINGS NTN BEARINGS KOYO BEARINGS NACHI BEARINGS.