Research On Collaborate Work And Error Correction Of Laser Processing Multi-axis Platform Based On Machine Vision

Laser processing technology is widely used in industrial processing because of its advantages of high energy,good controllability,high stability and no contact with the workpiece.The laser galvanometer marking system which has the characteristics of high marking speed,high efficiency,high marking accuracy and good marking quality,is widely used in the field of high-precision laser processing.Due to the fact that the marking area of the galvanometer marking system is limited,it is impossible to complete the large-scale processing by relying on the marking system alone.By using multi-axis platform to expand the marking area of galvanometer marking system,it is difficult to match the marking data through different coordinate systems.And it will affect the processing cooperativity of the marking system and multi-axis platform.There are also many factors that can cause the machining errors among the systems,which will seriously affect the accuracy of the process.The purpose of this paper is to use machine vision and numerical control technology to study the collaborative problem in laser processing multi-axis platform,so as to improve the accuracy,quality and efficiency of collaborative machining.The main aspects of this paper include:(1)Expand the processing range of galvanometer through multi-axis mobile platform.Design and build the hardware system of the large-scale laser processing multi-axis platform,and develop the supporting software system to do the error correction job and collaborative work.(2)Based on machine vision,a galvanometer correction method is proposed by using landmarks.By balancing the accuracy,stability and efficiency,the most suitable landmarks extraction algorithm is selected to ensure the practicability of this correction method.By using this method,the process of galvanometer correction is more convenient,efficient,accurate and flexible.(3)In order to solve the problem of the cooperation between galvanometer and multi-axis platform in large-scale splicing processing,the connection between galvanometer and multi-axis platform is established by using the vision system supported by industrial camera.Therefore,the marking data in different system is matched through the connection above.At the same time,the collaborate precision between galvanometer and the platform is greatly improved in splicing processing.A method is proposed to solve the problem of the cooperative movement between air-blowing device and the galvanometer marking system.Through this method,the air-blowing device's following difficulty has been reduced.While ensuring the processing efficiency and the marking beam has not been blocked,the processing quality is highly improved.(4)Testify the above methods through the experiments.Display the correction result and analyze its accuracy.And show the effect on collaborative splicing process after the correction.The methods above have been applied well in the actual processing environment.