| Tiandi Ningxia Support Equipment Co.,Ltd.produces the top beam by means of man-machine hybrid welding.At present,the enterprise adopts manual auxiliary operation when splicing and positioning the top beam parts.After the robot to complete the subsequent welding work,can improve the early manual welding efficiency is low,high labor intensity.Due to the inconsistent requirements of robot welding and manual welding,the robot can not directly and automatically weld after the completion of manual operation in the production of welding line,that is,the problem of man-machine compatibility in man-machine hybrid welding of production line.Therefore,in order to solve the existing compatibility problems,a set of solutions suitable for the actual situation of the enterprise is needed,and when the enterprise purchases robots in the future through this scheme,it can be evaluated according to the enterprise itself and the knowledge structure of the personnel.Firstly,it is necessary to understand whether there are errors in the top beam currently produced by enterprises,and analyze the random cumulative error of the top beam under the theoretical size.After calculation,the cumulative error range of the top beam in a certain direction is obtained,and the error value is checked to meet the allowable error range of the robot,and the tolerance distribution of the main parts of the top beam is calculated again.Secondly,the welding process of the top beam is analyzed,and the fault tree method is used to find out the key welding processes that have a great influence on the welding compatibility.The principle of fault tree construction is to determine each event and the logical relationship between them according to the welding process,and then establish the fault tree and calculate the minimum cut set.Then according to the importance of each welding process and the fault tree model,the importance of various fault factors is calculated,and the key process affecting the top beam welding is obtained.Then the main factors affecting the robot welding top beam are obtained and targeted improvement is carried out.In order to control the random cumulative error and splicing error of the top beam and the positioning of the components,a set of special welding fixture is designed for this type of top beam.The design concept of the fixture is first to determine the welding position of the parts,and secondly to ensure that the assembly and disassembly of other parts and fixtures are not affected.For fixture design,this paper uses UG drawing software.After the fixture design is completed,the UG drawing software is used to verify whether the fixture can be assembled with the top beam.Fixture design can help workers successfully complete the welding work and reduce the deviation between the parts to ensure that the robot can complete the subsequent welding work.Finally,in order to solve the problems existing in the existing production operation of the enterprise,the production operation scheme of the top beam is reconstructed for the ZF8000/17/32D hydraulic support top beam.The purpose is to control the randomness in the manual operation,so that the workers can carry out the welding work reasonably and normatively. |
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