How to improve the performance of the ball screw

High speed CNC machine tools also have a high speed spindle system and a high speed feed system to achieve high speed material cutting.In order to achieve high-speed feed, domestic and foreign manufacturers continue to take measures to improve the high-speed performance of Ball Screw pair.The main measures are: 

Increase screw speed, lead and thread number appropriately.At present, the commonly used diameter of the large Lead Screw with leads are :400mm*20mm, 50mm*25mm, 50mm*30mm, etc., the feed speed can reach more than 60m/min.In order to improve the rigidity and Bearing capacity of ball screw, double screw threads are generally used to increase the effective number of bearing rings of ball screw. 

The structure is improved and the stability of ball movement is improved.The ball reversing device was improved and the ball groove curve parameters were optimized.The ball is introduced into the nut body along the leading Angle of the inner thread by using the three-dimensional shape of the bead tube and the ball return device to make the ball move.The direction is tangent to the raceway rather than intersecting.This minimizes shock losses and noise. 

Hollow strong cooling technology.high speed ball screw produces high temperature due to friction during operation, which leads to thermal deformation of the screw, which directly affects the machining accuracy of high speed machine tools.Hollow strong cooling technology is the constant temperature cutting fluid into the hole of the hollow screw, forced cooling of the ball screw, so that the ball pair temperature is constant.This measure is an effective way to improve the high speed performance and working accuracy of medium and large ball screw pair.

For high speed feed system with large stroke, fixed screw and nut rotation can be used.At this time, the nut in rotation along the fixed screw axial movement, do not understand the screw, so as to avoid the critical speed limit, to avoid the long ball screw in high speed operation of various problems.Nut inertia small, flexible movement, high speed can be achieved. 

Further improve the manufacturing quality of ball screw pair.By adopting the above measures, some problems of ball screw transmission can be overcome to a certain extent.Its maximum fast moving speed can reach 60m/min, sometimes even 90m/min, and its acceleration can reach 15m/s2.Because ball screw pair has a long history, mature technology, wide application, low cost, in the medium load and feed speed is still not very high, general high-speed machining center and other economic small range of high-speed CNC machine tools are still often used.