Research On Key Technologies Of Automotive Thermal Insulation Part

With the rapid development of the automotive industry,People's requirements on the overall driving comfort of the car are getting higher and higher,putting forward new requirements to the overall thermal insulation and noise reduction.The existing research results show that the corrugated blank is better than the flat blank in thermal insulation,corrugated blank has been widely used in thermal exchanging equipment and automotive thermal insulation devices for industrial engineering,the thermal insulation part made of corrugated blank not only has better insulation effect but also can effectively reduce cab noise produced by the engine and exhaust system vibration.However,few researchers studied on the factors that affect the thermal insulation effect of corrugated blank and the drawing process of corrugated blank.In this paper,the corrugated blank aluminum alloy AA1050,which is commonly used in automobile thermal insulation,is used to study the insulation efficiency of corrugated blank with different structure sizes,the forming of cylindrical part and the installation and fixing of automobile thermal insulation part,the main research contents and achievements are as following.Thermal simulation was conducted on corrugated blank with different structure sizes,explored the influence of corrugated structure size on the thermal insulation effect.The results show that the thermal insulation efficiency of the corrugated blank increases with the increase of the diameter,increases and then decreases with the increase of the height,and decreases with the increase of the corrugated blank thickness.In addition,the installation location of the corrugated blank and the type of corrugation have a greater impact on its thermal insulation efficiency.Further analysis shows that increasing the distance between the insulation part and the protected part can effectively reduce the protected part temperature;double-sided corrugated insulation blank has a higher thermal insulation efficiency than single-sided corrugated insulation blank.Study on forming process of partial characteristic cylindrical part of thermal insulation part,the effects of stamping speed,die interval and blank holder force on the forming quality were analyzed.Finally,the response surface method is used to optimize the forming process parameters and obtain the optimized process parameters.The results show that when the stamping speed is 350mm/s,the die interval is 1.22 mm and the blank holder force is 0.4t,the thickness distribution of the cylindrical part section is optimized,and the maximum reduction rate of the material is reduced.The structural dynamic simulation is carried on thermal insulation part,the natural vibration frequency of the thermal insulation part under different fixed modes and the vibration modes at each natural frequencies stage are obtained,then harmonic response analysis was conducted on primary fixation schemes of four corner point fixed and four side point fixed scheme,we get the response values under the two fixed schemes,and finally choose the four corner point fixed scheme as preferred scheme of thermal insulation part.