The Development Of Bilateral Chamfering Machine For Multi-Specification Bar And Tube Workpieces

Industrial automation is the inevitable trend of the development of manufacturing industry.With the progress and development of science and technology,people's demand for product quality is getting higher and higher.As a basic process,chamfering occupies an important position in the mechanical industry,so it is urgent to improve the efficiency and quality.At present,chamfering is mostly done by grinding or turning that is inefficient,of high labor intensity and poor quality.Based on the existing problems in chamfering,a new type of chamfering machine is developed in this paper.The chamfering machine can chamfer the workpiece bilaterally and improve the efficiency.Its loader and unloader is developed to realize automatic chamfering production.At the same time,in order to meet the quality requirements of chamfering,the automatic control method is studied.Firstly,the mechanical structure of bilateral chamfering machine is designed.Through the functional analysis,the whole design scheme of bilateral chamfering machine is determined.Its primary structure includes chamfering machine host,loader and unloader,adjusting device and infrastructure,and the whole machine model is built based on the three-dimensional modeling software CATIA.Considering the influence of the main parts on the performance of machine tool,the main parts of bilateral chamfering machine are selected and checked.Based on ANSYS Workbench 16.1,the finite element analysis of chamfering machine is carried out.The static analysis is carried out.The static analysis mainly studies the stress distribution and deformation which determine the rationality of the structure design.Dynamic analysis of the whole machine is carried out,mainly modal analysis and harmonic response analysis.Modal analysis is the basis of dynamic analysis.According to the structure of modal analysis,the naturalfrequencies of the whole machine and their corresponding mode shapes are determined,and the peak frequencies and amplitudes of the whole machine in all directions are determined by harmonic response analysis,and compared with the natural frequencies of the machine tool,so as to avoid the possibility frequencies to occur resonance.The control platform of bilateral chamfering machine is built.In view of the actual work needs,PLC is selected as the controller of bilateral chamfering machine,and the electrical system of machine tool is designed,including the main circuit,control circuit and pneumatic system.According to the processing requirements,the I/O address of PLC is allocated,and the program of PLC is designed.The control strategy of bilateral chamfering machine is studied.In order to ensure the quality in processing large thickness and diameter workpieces and to solve the problem of increasing load at constant feed speed in chamfering process,the control strategy of bilateral chamfering machine was studied.The mathematical models of machine spindle system and feed system are established,and the control method of fuzzy PID is studied,which is modeled and simulated in Matlab/Simulink to verify the feasibility of the control strategy.The validity of the control strategy in chamfering is proved by experiment.