关键词: 拧紧曲线；拧紧策略；比率监控

Abstract: The article analyzes the problem of floating nails during bolt tightening. By analyzing the torque angle curve, it is found that there is a difference between the failed bolt curve and the normal bolt curve. Through effective analysis and identification of the curve, the entire tightening curve is divided into several parts. The starting and ending points of each part of the curve can be set according to the actual process conditions. By setting the ratio of the change in torque and angle difference between the starting and ending points, effective constraints on the changes in this part of the curve are indirectly achieved, thereby monitoring the entire tightening process. At the same time, the torque angle ratio method is explored for its effectiveness in monitoring bolt skew, model errors, thread abnormalities, and foreign objects in threaded holes, implementing stricter process control for bolt tightening and providing reference for the control of high demand and highprecision bolt tightening. Key words: tightening cur

Key words: tightening curve; tightening strategy; ratio monitoring