Research On The Forming Process Optimization Of Multi-column LED Radiator With Additional Back Pressure

LED lamp is a new type of green solid-state light source,but only 15%-20% of its output power is converted into light energy,and the rest is converted into heat energy.If the heat does not dissipate in a certain time,it will not only reduce the luminous efficiency,but also cause the chip of LED lamp to be too hot and fail.Reasonable and efficient heat dissipation device plays a key role in maintaining the brightness of high-power LED lamps and extending the service life of lamps.Cold extrusion is one of the important processes of LED radiators forming.Reasonable and effective program optimization design and research on process parameters optimization have a good guiding role in actual production.In this paper,an additional back extrusion process is proposed to solve the problem of forming height inconsistency of radiator fin column.Based on the optimization algorithm,the friction coefficients of phosphating and unphosphating of Con Datub 61 blue,Fuchs 1905 L,ZWEZ Lube PD 473 and ZWZE Lube PD AX were tested in the friction experiment of the upsetting method with a ring with a reinforcement(rct-b).The stress,strain and load information of the two different technological schemes are obtained by numerical simulation,and the second technological scheme is the optimal one by analysis and comparison.In the second scheme,in the forging process,the mold load at each station is small and evenly distributed,and the parts produced have good surface quality and no defects.And adopt suitable for forging forming technology and die design of combination optimization method,the first radiator forming process parameters on the orthogonal experiment design,and simulation with finite element software parts of cold forging forming process,designed for numerical value,by means of analysis of variance(ANOVA)an analysis of the significant process parameters,screening of important process parameters,reducing the design optimization problem specification.Then an approximate model between the process parameters and the objective function is established by response surface analysis(RSM),and the optimal solution of the target value in the feasible design space and the corresponding combination of process parameters,namely the optimal process scheme,are obtained by using finite element software.The die structure of LED radiator is designed based on the research of cold forging forming process parameter optimization.In order to solve the defects of fin column filling,such as large difference in height and height in actual production,the mold structure adopts not only the usual deep cavity structure,but also the back pressure additional forging process,and the back pressure system is designed on the mold.Finally,the actual manufacture mold and test verification.