光滑圆试样疲劳试验夹具优化设计及使用经验
Optimal Design and Experience for Fatigue Testing Clamp of Smooth Specimens

高频疲劳实验机的夹具压盘上的螺纹容易损坏,严重时会导致工件无法取下。通过20MnTiB棒材在PLG-100高频疲劳试验机上进行疲劳实验时,多次借助扳手拧下试样而损坏了夹具压盘的螺纹,导致夹具压盘无法将试样固定在疲劳机上继续试验。针对此问题提出3种修复压盘螺纹的方法,分别在压盘中心镶嵌圆柱套、同心圆柱台阶套和螺纹套。疲劳试验结果表明:只有镶嵌螺纹套修复法能完成实验的要求并得到了疲劳寿命曲线水平部且维修方便,快速经济。与前两种方法比较,镶嵌螺纹套法能提高螺纹连接强度、耐热性和耐磨性。
The thread on the clamp pressure plate of high frequency fatigue test machine easily damaged, and which led to not remove the work-piece. In the fatigue test process of 20MnTiB bar under high frequency on the PLG-100 machine, the thread of the clamp pressure plate was damaged with the aid of a wrench repeatedly, and the work-piece was not fixed on the fatigue test machine. Then three methods to repair the pressure plate thread are presented, including embedded cylinder sleeve, sleeve of concentric cylindrical steps and the threaded sleeve in the center of the pressure plate. The fatigue test results indicated that with the repair method of threaded sleeve could complete the test requirement and the horizontal portion of fatigue life curve was obtained and convenient maintenance, rapid economy. Comparing the former two methods, the method inset threaded sleeve could improve the thread connection strength, heat resistance and abrasion resistance