Application of Ball Screw on High Speed ​​CNC Machine Tool

2018 06/22

High-speed machining is a high-paying technology oriented to the 21st century. It is characterized by high efficiency, high precision, and surface quality. It has become increasingly popular in aerospace, automotive, tooling, optoelectronic engineering, and instrumentation. The application, and has achieved significant technical and economic benefits, is an important part of contemporary advanced manufacturing technology. In order to achieve high-speed machining, high-speed CNC machine tools are first required. High-speed CNC machine tools must have both a high-speed spindle system and a high-speed feed system to achieve high-speed material cutting. In order to realize high-speed feed, manufacturers at home and abroad have continuously taken measures to improve the high-speed performance of the ball screw. The main measures are: Appropriately increase the screw speed, lead and thread number. At present, the matching of the nominal lead diameter and lead of a large-lead ball screw is: 400mm*20mm, 50mm*25mm, 50mm*30mm, etc., and the feed rate can reach 60m/min or more. In order to improve the rigidity and load-carrying capacity of the ball screw, the large-lead ball screw generally adopts double-headed threads to increase the number of effective bearing cycles of the ball.

Improve the structure and improve the smoothness of ball movement. Improve the ball circulation reversal device, optimize the curve parameters of the return ball groove, adopt the three-dimensional shape of the guide tube and the return ball device, truly introduce the ball into the nut body along the lead angle of the internal thread, so that the ball moves The direction is tangent to the raceway rather than intersecting. This minimizes shock losses and noise. Further improve the manufacturing quality of ball screw. By adopting the above measures, some problems in the transmission ball screw can be overcome to some extent. Its maximum fast moving speed can reach 60m/min, and in some cases it can even reach 90m/min and the acceleration can reach 15m/s2. Because the ball screw has a long history, mature technology, wide application, and low cost, it is still not very high in the middle load bearing, the feed rate is not very high, the general high-speed machining center and other economical high-speed CNC machine tools whose travel range is not too large are still Often used.