Abstract:

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.

Key words: error evaluation, laser ranging, non-contact measurement, flatness