非接触式缸盖平面度误差检测方法与测量系统研究*

为解决发动机缸盖生产铸造过程中缸盖底面平整度误差检测问题，设计一种激光非接触式发动机缸盖底面平整度在线检测系统，提出一种基于对角中线的平面度误差检测算法。根据现场平面度检测需求，设计利用激光臂纵轴和缸盖横轴传送的交互运动的发动机缸盖表面平面度误差检测系统;通过发动机缸盖表面检测四个顶角特征点对角线中线建立发动机缸盖平面度检测的数学模型，利用回归方程确定最小二乘法平面为理想平面，求出平面度误差;并对激光位移传感器进行精度标定，给出传感器误差标定回归方程，并应用该检测系统完成对不同型号的发动机缸盖检测。结果表明：该系统最大检测面积为400 mm×2 000 mm，测量范围为160~450 mm，测量精度为0.03 mm，而且结构简单，检测速度快，完全能够达到在线检测要求。

Study on the Detection Method and Measurement System of Head Flatness Error on Non-contact Detection

In order to solve the problem of engine cylinder head casting production process of the bottom of the cylinder head surf- ace flatness error detection problem, the design of a laser non-contact cylinder head surface flatness on-line detection system, a met- hod of flatness error detection based on diagonal line is proposed. According to the field flatness detection demand design using laser arm axis and cylinder head horizontal transfer reciprocation engine cylinder head surface flatness error detection system; Through the engine cylinder head surface detection feature point four corners diagonal midline build a mathematical model of the engine cylinder head flatness testing, regression equation to determine the method of least squares plane is ideal plane, calculated flatness error; The laser displacement sensor calibration, given the sensor error calibration regression equation and application of the detection system on different types of engine cylinder head detection. The results showed that:The system has a maximum detection area of 400 mm×2 000 mm, the measurement range of 160-450 mm, the measurement accuracy of 0.03 mm, and simple structure, speed, and is fully capable of reality testing requirements.