Design And Research Of Control System For Automatic Assembly Unit Of Deep Groove Ball Beaings

With the rapid development of the domestic manufacturing industry,the demand and quality requirements of deep groove ball bearings continue to be higher.However,most bearings currently are assembled manually or semi-automatically in domestic manufacturers.This method of bearing assembly is inefficient and low quality.For realizing automatic production of bearings assembly,this thesis needs to develop the control system of the automatic assembly unit for deep groove ball bearings.First,the thesis does research for the overall design of deep groove ball bearing automatic assembly unit.Then the significance of the study is summarized by comparing the assembly technology of bearing industries at home and abroad.After that,the structure of the bearing is analyzed to sort out the process of bearings assembly,and the functions of control system are determined by studying the mechanical design models of the assembly unit's key stations.Based on these,by comparing four kinds of automation systems,the thesis decides to design the assembly unit based on PLC,which uses the Industrial Ethernet and Fieldbus as the communication technology of control system.After the completion of above research,the hardware design and software design of control system are deeply studied.First,according to the design principles of the electrical cabinet,the structure and layout of the main and sub-distribution cabinets are designed.Then the type selection is studied for the important components,such as PLC,distributed I/O device,etc.And further,the load model of servo motor is constructed to select the appropriate servo motors by calculating load speed,torque and inertia ratio.At last part of the hardware design,the selections of the pneumatic components,like pneumatic transmission components,air source processing devices and solenoid valves are studied.Also,the load model of cylinder is constructed to select the appropriate cylinders by calculating the thrust and tension when the cylinder is extended and retracted.Based on the research results of the hardware scheme,the TIA platform of Siemens is used to build the program framework of system by the hardware configuration of the control system.The standard program blocks,like manual standard program sections and automatic standard stepping structure are designed by using the STL program language.Then the thesis combines the control logic diagram by studying control logic of each key station.After that,the model of clearance measure is constructed by using the Floyd iterative algorithms and SCL high-level program language,to achieve the goal of optimal matching.In the end of the software part,the thesis finished the design of WinCC project.Finally,on basis of the above research results,the prototype of the assembly unit is designed and put into work.Based on the data of OEE and machine cycle time,the test and analysis of the prototype machine are carried out,which is a foundation for further improvement.