T型导轨翘曲变形矫正的载荷-行程模型

Load-stroke Model for Straightening the Warpage of T-rail

根据弹塑性力学理论,分析了T型导轨翘曲矫正过程中所经历的弹性加载、弹塑性反弯和卸载回弹这3个变形阶段,推导了各个阶段的矫正载荷、弯矩和行程间的关系,给出各变形阶段的载荷-行程关系式,从而建立T型导轨翘曲变形矫正的载荷-行程模型。利用该模型,可根据导轨的初始翘曲挠度快速、准确地计算出相应的矫正行程。为验证该模型的正确性,以T89/B型导轨为例进行了实验对比分析,其结果表明该理论模型与实验所得出的矫正行程间的相对误差在10%以内,该模型是切实可行的,可为T型导轨全自动翘曲矫正机的开发提供理论支持。

Three deformation stages of straightening T-rail＇s warpage,including elastic deformation,elastic-plastic deformation and elastic unloading springback,were analyzed according to the elastic-plastic mechanics theory,the load-stroke expressions of three deformation stages were gained through deriving relationships among load,bending moment and stroke,and then the straightening load-stroke model was established.By using the model,the straightening stroke could be calculated directly and accurately according to the initial deflection.In order to verify the model presented,taking T89/B guide rail for example,the straightening experiment was conducted.Comparing the calculation strokes by model with experimental results,the relative errors are less than 10%.It showed the presented model was practical.It will give theoretical support to the development of automatic machines for T-rail＇s warpage straightening.