中文摘要：

提出一种曲轴连杆颈圆度准在线测量与补偿系统，依据随动过程连杆颈中心与砂轮中心距离恒定的运动特征设计基于砂轮同心摆臂、v形基准块的圆度测量机构，通过摆臂自重力实现连杆颈偏心旋转驱动下的跟随扫描，采用柔性牵引索实现磨削过程v形基准块对连杆颈的捕捉与分离操作，继而实现连杆颈圆度状况的准在线测量。从运动学角度分析V形基准块中线上测量探头的扫描角与随动磨床引导轴转角位置的精确几何关系，通过微变等效模型建立从探头位移信号求解圆度偏差信号的方法。在MQGl000型数控曲轴随动磨床上的应用测试以及JL4G15D型曲轴试样的圆度分析数据表明，所研究准在线测量与补偿系统具有结构紧凑、检测效率高、连杆颈圆度补偿效果好的特点。

英文摘要：

A quasi-online roundness measurement and compensation system is proposed for crankshaft pin journals, in which, roundness measurement mechanism based on a wheel-concentric swing arm and a V-block is investigated according to the motion characteristic of constant distance between the wheel central and pin journal＇s central during follow grinding. Follow scanning is realized for the wheel-concentric swing arm through both the self-gravity and the driven force from pin journal＇s eccentric rotation. The capture and detachment operations of a target pin journal are achieved for the V-block by a flexible dragline. Consequently, quasi-online roundness measurement is fulfilled for crankshaft pin journals. The precise geometric collection between the angle position of leading shaft of the follow grinder and the scanning angle of the probe, which is placed on the centerline of the V-block, is kinematically analyzed. Solving method for roundness error signal based on a micro-variation equivalent mode is carried out for the process of probe signal. Through an implementation test on MQG1000 type CNC crankshaft follow grinder and the roundness analysis data acquired from JL4G15D type crankshaft sample, the presented quasi-online roundness measurement and compensation system emerges good characteristics in precise machining of crankshaft pin journals, such as compact structure, high efficiency, and good roundness compensation performance.