Design And Error Analysis Of Multi-Axis Motion Control Experimental Platform

In recent years,automation and artificial intelligence have been widely used in the manufacturing industry.Unmanned chemical industry have become a major trend in manufacturing development,and The accuracy of motion is the main prerequisite for automation.Therefore,motion error measurement and compensation become very important.At present,laser interferometers and ballbars are commonly used to measure their comprehensive errors.Although the accuracy is high,the cost is high and the operation process is cumbersome.For automated production line of general precision,this paper proposes an error compensation method with simple operation and low cost.To verify the validity of its error compensation method,The paper used the multi-axis motion control experimental platform designed by ourselves to simulate the working process of the automated assembly line,and analyzed the motion error of the experimental bench.The main work and results of the thesis are as follows:(1)According to common functions of automated production line,design the structural model of the multi-axis motion test bench,including the overall design,the design of each component.Then static analysis of the key components of the test bench and modal analysis of the gantry mechanism to ensure safety of the test bench,also lays the foundation for the accuracy of error measurement.(2)Defining the main error sources of multi-axis test bench work,modeling the geometric error of gantry mechanism and belt motion,and analyzing the error elements of each axis and belt motion of the gantry mechanism,We can obtain The error transformation matrix of multi-axis experimental platform gantry mechanism,and establish a comprehensive model of geometric error of gantry mechanism.(3)According to geometric error model based on gantry mechanism,we use vernier caliper and multi-purpose level ruler to get geometric error measurement of multi-axis experimental platform gantry mechanism and belt drive.Measure the error separately by decomposing the integrated motion into uniaxial motion.Using coordinate offset method combined with measurement data to realize error compensation program compilation(4)Through the test,compare the motion error of the gantry mechanism before the error program loading with no error program to verify the correctness of the error model,and the effectiveness of the measurement error method and process.Through comparing the error comparison of the 23 positions of the continuous motion of the gantry mechanism,prove that the motion error of the gantry mechanism is effectively compensated after loading the compensation program,and the positioning accuracy of the workpiece is improved by about 80%.Research indicates:Through decomposing the comprehensive error of the gantry mechanism into the direct measurement of each one-way motion error,measure directly and use the error transformation matrix and the coordinate offset principle compile the compensation program,which can compensate the motion error of the gantry mechanism usefully.This error compensation method is practical and effective.It can be applied in an automated production line with low precision requirements.,which saves cost and meets positioning accuracy requirements.