Research On Intelligent Welding Fixture In Front Axle Of Automobile Frame

Updated science and technology drive the development of industry,at present the industrial manufacturing welding line has been preliminarily accomplished robot welding operation,but the type of welding jig is still using artificial positioning,clamping and feeding and blanking,which cause the whole welding sequence time-consuming,low efficiency,at the same time,the spotting of each weldment is affected by the human factors,which can not guarantee its accuracy.To solve these problems,this paper uses the frame front axle welding intelligent fixture design as the research object,based on the traditional frame front axle welding station layout,designs a roboticized fixture,also detailedly remoulds the whole structure and function of fixture,which makes it can accurately and automatically recognize,spot,feed and blank the weldment,and job information of the fixture can also be transmitted to the welding robot,which help further planning welding operation.Firstly,the concept of modular fixture structure layout has been put forward,and feeding and blanking of the target weldment are finished by using the motion of fixture module.For realizing the unified spotting clamping way of multiple weldment by the fixture module terminal,through analyzing the structure and welding sequence of multiple weldment of front axle,determining the uniform processing and spotting hole,using location hole and fixture module terminal auxiliary spotting weldment for achieving spotting clamping of the target weldmentSecondly,based on monocular vision recognition system which is proposed for identification of target weldment and its information of the position and orientation,through the industrial personal computer will deliver the identified information of the position and orientation to fixture module of the subordinate computer,motivating the fixture module terminal automatically spot the target weldment,ensure the target weldment in t terminal he correct position and orientation on fixture,fixture module finish feeding and blanking by moving to the target position.Thirdly,the mathematical model is established by d-h method for the design of the fixture movement module,and the forward kinematics and inverse kinematics analysis are solved.Error model based on kinematic analysis,combined with Matlab software conducting error of the simulation experiment to the position and orientation of fixture module terminal,through the analysis and comparison of the error graph,identify the main factors influencing the position and orientation of fixture module terminal,which offering the theoretical support for improving the accurate position and orientation of fixture module terminal.