提高航天用钢丝绳张力稳定性的方法研究

普通钢丝绳经过预张拉后结构伸长率为0.1%～0.7%,无法确保航天用钢丝绳结构伸长率小于0.01%的要求。针对初始张力大小、钢丝绳是否经过预张拉、高低温循环次数、温度高低、钢丝绳安装基座特性等影响张力稳定性的可能因素,设计7个试验工况进行测试。试验表明:采用预张拉与高低温循环相结合的方法,可以使钢丝绳结构伸长率从0.0421%下降到0.0059%,张力变化率从20%下降到2.9%,大幅度提高了钢丝绳的张力稳定性,可满足航天用钢丝绳产品的需求。

Method research to improve tensile force stability of wire rope for spaceflight

The structure elongation of common wire ropes are at 0.1% - 0.7% after pre-tension, which can not satisfy the spaceflight wire rope demands for structure elongation below 0, 01%. Aiming at such factors affecting tensile force stability as initial tensile force, wire rope whether undertaking pre-tension or not, cycle numbers at high and low temperature, temperature high or low and fixing base characteristic of wire rope, seven experiments situation are designed and to test. The results indicate that adopting the method combining pre-tension with high and low temperature cycle can make wire rope structure elongation decrease from 0. 042 1% to 0. 005 9% , tensile force change rate decrease from 20% to 2.9% , the tensile force stability of wire rope rise greatly, which can satisfy the demands of wire rope for spaceflight.