How to properly choose the numerical control machine tool guideway?

How to properly choose the numerical control machine tool guideway? 2019 - 05 - 19 machine tool guideway performance good or bad, directly affect the machining accuracy of machine tools, carrying capacity, and performance. So, guide should meet the following basic requirements: simple structure, good orientation precision, accuracy stable, low speed running smoothness and good manufacturability. Guide rail as an important part of the feed system, different types of machine tools, to the requirements of the guide rail is different also. CNC machine tool guideway to be higher than common machine tool guideway requirements: high speed feed without vibration, low speed feed does not appear when the crawling phenomenon, high sensitivity, good abrasion resistance and can work continuously under long-term overloaded, good accuracy stable, etc. When choosing machine tool machine tool users, according to oneself circumstance in view of the above requirements to machine tool guideway. Common machine tool guideway form a sliding guide rail, rolling guideway and hydrostatic guideway. 1 slide guide slide guide has simple structure, easy fabrication, good stiffness and strong vibration resistance, most widely used in general machine tools, often made from iron or inlaid steel rail. In order to improve the wear resistance and precision of the slideway, generally carried out on the guide rail surface hardening, and grinding. 2 rolling guide rolling guide is installed between guide face roller, roller can ball, roller and roller, and guide the contact between the contacts or line contact, so, the guide of the friction coefficient is small. Of dynamic and static coefficient of friction are basically the same, small starting resistance, good low speed running smoothness, high positioning accuracy, micro displacement accurately, wear small, good accuracy stable, long service life. The downside is poor vibration resistance, high requirements for protection. Rolling guide, especially the linear rolling guide, is widely used in recent years, with the development of high speed nc machine tools to, linear guide rail used more and more widely. 3 static pressure guide used in machine tool hydraulic guide mostly hydrostatic guideway. Hydrostatic guideway usually in two relative motion between the guide surface of ventilation with pressure oil, float the moving parts. Oil pressure can be changed with the applied load, automatic adjustment, to ensure that remain the state of pure liquid friction between guideway, so with hydrostatic guideway minimum friction coefficient, small power consumption. The guide rail is not easy to wear and tear, the precision of the slideway good stability, long service life. Its oil film thickness is almost not influenced by speed. The oil film bearing capacity and high stiffness good shock absorption, smooth operation, no crawl phenomenon. Hydrostatic guideway structure is complex, and requires good filtering effect of hydraulic equipment, the manufacturing cost is high.