Definition of ball screw
Ball screw is an ideal product that converts rotary motion into linear motion, or converts linear motion into rotary motion.
Ball screw consists of screw, nut and ball. Its function is to convert rotary motion into linear motion, which is the further extension and development of ball screw. The significance of this development is to change the bearing from rolling motion to sliding motion. Because of its small friction resistance, ball screw is widely used in various industrial equipment and precision instruments.
Ball screw is the most commonly used transmission element in tool machines and precision machinery. Its main function is to convert rotary motion into linear motion or torque into axial repeated force. At the same time, it has the characteristics of high precision, reversibility and high efficiency.
Characteristics of ball screw
1. And sliding screw rod
Secondary comparative driving force distance
1/3
There are many balls rolling between the screw shaft and the screw nut of the ball screw, so a higher motion efficiency can be obtained. Compared with the past sliding screw pair, the driving torque is less than 1/3, that is, the power required to achieve the same movement result is 1/3 of that of the rolling screw pair. It is very helpful in saving electricity.
2. Guarantee of high precision
The ball screw is made in Germany or Japan
The world's highest level mechanical equipment is produced continuously, especially in the factory environment of grinding, assembly and inspection processes. The temperature and humidity are strictly controlled, and the accuracy is fully guaranteed due to the perfect quality management system.
3. Micro feed possible
Because the ball screw uses the ball motion, the starting torque is very small, and there will be no crawling phenomenon such as sliding motion, which can ensure the realization of accurate micro feeding.
4. No side clearance, high rigidity
The ball screw can be pre pressed, because the pre pressure can make the axial clearance reach a negative value, so as to obtain higher rigidity (the ball screw can increase the rigidity of the screw nut due to the repulsive force of the ball when it is actually used in mechanical devices).
5. High speed feed possible
The ball screw can realize high-speed feed (movement) because of its high movement efficiency and low heating. Accuracy tolerance: C10, C7, C5, C3, C2, C1 -- the smaller the number, the higher the accuracy.
Motion principle of ball screw
1. According to the national standard gb/t17587.3-1998 and application examples, the ball screw (which has basically replaced the trapezoidal screw and has been commonly known as the screw) is used to convert rotary motion into linear motion; Or the actuator that converts linear motion into rotary motion, with high transmission efficiency, accurate positioning, etc
2. When the ball screw is used as the driving body, the nut will be converted into linear motion according to the lead of the corresponding specification with the rotation angle of the screw. The passive workpiece can be connected with the nut through the nut seat, so as to realize the corresponding linear motion.
World's leading ball screw manufacturers:
Taiwan Shangyin HIWIN ball screw, Taiwan TBI ball screw, Taiwan PMI ball screw,
，
SBC ball screw,
Bosch Rexroth (formerly star) ball screw, etc
Use of ball screw
In order to adapt to various applications, ball screw bearings provide a wide range of standardized products. The circulation mode of the ball includes circulation conduit type, circulator type and end cover type. The preloading methods include positioning preloading (double nut preloading, position preloading) and constant pressure preloading. The appropriate type can be selected according to the purpose. The screw rod has high-precision grinding precision ball screw (precision is divided into 6 grades from co-c7) and high-precision cold-rolled ball screw bearing (precision is divided into 3 grades from C7-C10). In addition, in order to meet the urgent needs of users for delivery, there are also finished products that have been processed at the end of the shaft, semi-finished products that can be freely processed at the end of the shaft and cold-rolled ball screw bearings. As the peripheral parts of the bearing, the necessary lead screw support unit, nut support, lock nut, etc. have also been standardized for users to choose.
Based on the product technology accumulated over the years, the ball screw bearing is managed by a strict quality assurance system from material, thermal treatment, manufacturing, inspection to shipment, so it has high reliability.
