Precision prediction method of ball screw pair

Abstract

The invention discloses a precision prediction method of a ball screw pair. By using the method, the whole processes of precision degradation and a vibration signal of a tested ball screw pair under a simulated working condition are monitored, and the monitoring result is used for training a precision degradation neural network with an associative memory function, so that the mapping relationship between the sensitivity and the precision of the vibration signal of the ball screw pair can be more accurately obtained; and furthermore, the sensitivity of the current vibration signal of a ball screw pair with the same specification with the tested ball screw pair is input to the precision degradation neural network, so that the current precision of the ball screw pair can be obtained, and the online prediction for the precision of the ball screw pair is realized. The ball screw pair can be purchased in advance according to the precision degradation trend of the ball screw pair when the precision value is close to the value which can not meet the requirement of a provision, so that the stop time of a lathe is shortened, the loss of an enterprise is reduced, and the cost of the enterprise is saved. By using the precision prediction method of the ball screw pair, effective basis and guidance can also be provided for operating staff in analysis, judgment and maintenance, and the service life of the ball screw pair is prolonged.

Description

technical field [0001] The invention relates to the field of mechanical system state monitoring and fault diagnosis, in particular to a method for predicting the precision of a ball screw pair. Background technique [0002] A ball screw assembly is a component consisting of a ball screw, ball nut, and balls that converts rotary motion into linear motion, or linear motion into rotary motion. Among them, the ball screw pair used for precise positioning and can indirectly measure the axial stroke according to the rotation angle and lead is called the positioning ball screw pair; the ball screw pair used for power transmission is called the transmission ball screw pair. Compared with the sliding screw, the ball screw has the advantages of small driving torque, high precision, high rigidity, and low heat generation, and has been widely used in the equipment manufacturing industry represented by CNC machine tools. [0003] In recent years, with the implementation of the national ...

AI Technical Summary

Problems solved by technology

The decrease in the accuracy of the ball screw pair will cause a decrease in the dimensional accuracy of the workpiece and a decrease in the surface finish, and in severe cases, it may cause vibration of the machine tool

The ball screw pair must be replaced when the accuracy does not meet the requirements. However, due to the long cycle of spare parts, it will cause long-term shutdown of the machine tool and bring huge economic losses to the enterprise.

At the same time, the accuracy of the ball screw pair cannot be monitored online, and it is not conducive to the operator to analyze the reasons for the decline in the accuracy of the ball screw pair, so that its operation and maintenance have a certain degree of blindness, reducing the service life of the ball screw pair

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