Mechanical Structure Design And Analysis Of Parallel Machine Tool For Small Tool Processing Industry

Small tool processing is widely used in electronics,mould,electrodes,artworks and other field.With the improvement of processing requirements in various industries,traditional small tool machines face the problems of insufficient cutting force,poor rigidity and low efficiency,which are the advantages of parallel mechanism.In the small tool processing industry,the size of the processing object is generally small,so the disadvantage of small motion space of parallel machine tools is not obvious.Therefore,parallel machine tools and small tool processing are complementary,and their combination can maximize the value of the machine.The research objective of this subject is to design a parallel machine for small tool processing industry.According to the processing requirements and the advantages and disadvantages of parallel machine tools,this paper mainly study the machine structure and select the typical and practical configuration,then,design mechanical structure and analysis Kinematics and performance.Firstly,study the requirements of machine movement and processing requirements by analyzing the typical small tool processing technology.Determine the basic parameters of the research object reference to the mainstream equipments' processing capacity both inside and outside.Secondly,analyze the advantages and disadvantages of different machine axis allocation modes,according to 'the processing requirements,and choose the best machine layout.Combining with the characteristics of parallel machine tool,the configuration is selected and optimized.And then,preliminarily select the structural parameters and finish the design by the design objective and geometric relationship of each component.Continue,analyze the machine performance,and get the forward and inverse position solutions,as well as the Jacobian matrix of the speed.Then analyze the effects of the parameters of the mechanism on the workspace,the speed transfer performance and the mechanical transfer performance.With these results,the preliminary size design is carried out.Based on the theory of elasticity and virtual work,this paper establish a stiffness model,and analyze the static stiffness of the mechanism,then,obtain the stiffness distribution of the mechanism in the working space,study the influence of structural geometric parameters on the stiffness of the machine,and optimize the machine components,by taking the maximum workspace and stiffness as the design objective.Finally,this paper builds the three-dimensional model with Solidworks software,and imports the model into the simulation software Adams to do the virtual prototype analysis.In order to verify the correctness of the model,Adams and MATLAB are simulated at the same time,and their results are compared and verified.Classify the typical processing technologies,plan and simulate the processing path,and then analyse the motion stability and drive force of the machine.Compare this machine with ordinary machine tools to verify the performance improvement of performance.