Research on Ball Screw Load Prediction Method Based on Electrical Contacts
On the basis of analyzing the theory of electric contact of ball raceway in ball screw vice,a re-search method of predicting the load and preload force of ball screw vice by measuring resistance is pro-posed,which provides a new idea for the load state sensing of ball screw vice.Existing load sensing meth-ods are done offline,the ball screw sub is disassembled and mounted on a special test bench,and detected by a force sensor,which is large and not conducive to the detection of small and medium-sized screws.Therefore,it is necessary to use a physical quantity that can produce changes when loaded and detect a small sensor size for detection,electrical resistance.Translated with DeepL.com ( free version) Firstly,a ball screw sub contact force model is established based on the Hertz contact theory;then a ball load distri-bution model is established under the consideration of the additional load caused by machining error,geo-metrical error and other errors,and the numerical calculation formulas for the load,preload and deformation are summarized;finally,based on the Greenwood and Williamson theories of the electrical contact,an ideal ball screw sub circuit model is proposed to establish the The prediction model of load,preload force of ballscrew sub.Taking 3205-4-P2-405 variable lead ballscrew sub as an example,the rated static load and static stiffness test bench of ballscrew sub is used to carry out test verification.The maximum error between the test results and the theoretical calculated values is 5.88％,and the minimum error is 0.69％,which proves the accuracy of the proposed load and preload model of variable lead ballscrew sub based on electri-cal contact measurement.
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