Research And System Design Of Plastic Micro-damper Automatic Assembly

Micro plastic damper is widely used in automotive,equipment,hardware,appliances,furniture and other industries,to prevent the engagement surface damage caused by impact of switching activity.Micro plastic dampers are currently produced by manual assembly methods,which has problems like labor-intensive,low efficiency,high costs,poor product consistency,high rejection rate and so on.Therefore,a continuous and efficient micro plastic damper automatic assembly line was researched and developed,according to characteristics of the micro plastic damper production process.and its key technologies,such as ultrasonic welding,high viscosity micro-metering oiling,micro seal ring automatic assembly,micro damping force detecting were studied.The main research work and results are as follows:(1)after researching automation technology of small parts and products both at home and abroad,taking micro plastic damper produced by a company as an object,its assembly production process and technical parameters were analyzed.the micro-plastic damper automatic assembly process was restructured and optimized,overall scheme of micro plastic damper multi-station disc-type automatic assembly system was constructed.(2)The key technologies involved in the overall program of micro plastic damper multi-station disc-type automatic assembly system were studied in detail.1)ultrasonic welding technology of micro damper upper and lower lid: an ultrasonic thermal-mechanical coupling modal was established,ultrasonic welding energy optimization and modal analysis of ultrasonic vibration amplitude transformer and tool head were performed,optimal technical parameters of ultrasonic welding effect were obtained,which include vibration frequency:20KHz,welding pressure: 0.35 MPa,welding time: 0.4s,welding power: 1.2kW.And the ultrasonic tool head assembly and the corresponding ultrasonic welding machine were designed according to these parameters.2)high viscosity micro-metering oiling technology:aiming at poor flowability high viscosity damping oil,grading transportation and micro measurement method was studied through experimentation,and high viscosity micro metering oiling machine that combined by high pressure pump,screw extrusion two-level transport and micro volume metering was studied and developed,0-5g micro oiling of 1 million cs damping oil was achieved;3)micro damping force detecting technology: using soft sensing to study micro damping force detecting technology,to construct indirect measurement of micro damping force detection subsystem by measuring speed of micro motor,the detection of100-150 gf.cm micro damping torque was realized.(3)based on the key technologies analysis of micro plastic damper automatic assembly,1)using system design method to design system architecture of the micro plastic damper multi-station disc-type automatic assembly system,to select type for matching parts and components,and to construct the automatic transmission system of micro plastic damper;2)attitude-adjusting and guidance mechanism of automatic feeding device was designed and automatic feeding system was constructed;3)micro seal ring automatic alignment assembly technology was studied: vibration arrangement and positioning experiment was performed on micro and light damper seal ring(outer diameter?5,weight 0.02g),micro seal ring automatic positioning and assembly subsystem that combined by micro passage vibration positioning and micro slipway type cylinder ring head was designed,and damper seal ring automatic assembly was achieved.4)process control functional requirements of the whole automatic assembly line was analyzed,and an automatic assembly line control system of micro plastic damper combined by Mitsubishi PLC and touch screen was developed.In this paper,the micro plastic damper automatic assembly line have many advantages such as a continuous process,good product quality consistency,high production efficiency,which can effectively reduce labor intensity,saving production costs.The micro plastic damper automatic assembly technology and its assembly line can be used in the automatic assembly of other micro parts and components.