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How to maintain the precision of THK ball screw during operation

Publish Time：

2022-01-04

　　Previously, high positioning accuracy was primarily achieved by improving the precision of the THK ball screw itself. This resulted in stringent requirements for the cumulative pitch error of the THK ball screw, making manufacturing difficult and increasing production costs. High-precision ball screws, in particular, require processing using CNC thread grinders or laser feedback thread grinders. Let's explore how to maintain the precision of THK ball screws during operation!

　　As commonly used transmission components in machine tools and precision machinery, the precision of THK ball screws plays a crucial role in their proper functioning. Ball screw precision depends on manufacturing techniques and gradually decreases with age.

　　When purchasing THK ball screws, selecting a reputable manufacturer is paramount. Established ball screw manufacturers possess advanced manufacturing technologies, reflecting their strength, brand recognition, and reputation. For example, avoid cold-rolled screws, as their precision is generally lower. Some manufacturers incorporate friction-increasing holes in the screw shaft design. The wedging effect created by the ball screw nut compressing the balls against the screw shaft is a potential friction source. Increased friction leads to higher torque, impacting positioning accuracy and significantly reducing the lifespan of the ball screw, thus increasing production costs for businesses.

　　How to maintain the precision of THK ball screws? During operation, resistance and heat generated from continuous work are major factors affecting screw precision.

　　Design elements that introduce friction to the THK ball screw also increase torque and affect positioning accuracy. To keep friction within limits, spacer balls and bearing balls need to be alternated. Using a butterfly spring instead of a solid washer can also reduce ball screw torque. This spring allows axial deformation, reducing pressure.

　　Methods for Improving THK Ball Screw Accuracy

　　With advancements in science and technology, numerical control compensation techniques have been developed, allowing for high positioning accuracy without excessive grinding of the ball screw. To meet the requirements of numerical control compensation technology, international and departmental standards specify the allowable variation in ball screw travel during installation, such as variation within the effective travel, within any 300mm travel, and within 2 radians. The aim is to control the linearity of the ball screw travel error, creating conditions for numerical control error compensation.

　　Strategies for Improving THK Ball Screw Performance

　　High-speed machining is a cutting-edge technology of the 21st century, characterized by high precision and surface quality. It is widely used in aerospace, automotive, mold manufacturing, optoelectronics, and instrumentation industries, achieving significant technological and economic benefits. It is a crucial component of modern advanced manufacturing technology. To achieve high-speed machining, high-speed CNC machine tools are essential. These machines require both high-speed spindle and feed systems to enable high-speed material cutting processes. Ball screw manufacturers employ various methods to maintain screw precision; two common methods are described above. Selecting a professional ball screw manufacturer is crucial when purchasing THK ball screws.

　　The above describes how to maintain the precision of THK ball screws during operation. For more information, please contact us!



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