| Aluminum alloy frame component is a typical thin-walled aluminum component on rockets,with thin wall,large radian and large size,which has the characteristics of high thermal sensitivity and poor overall heat transfer performance.In the process of heating and quenching,the whole component is prone to uneven temperature,resulting in different degrees of quenching deformation.Therefore,it is necessary to apply certain technology to realize the precision control of thin-walled aluminum frame components during solution and quenching process In this paper,the aluminum alloy thin-walled frame ring component is taken as the research object.The numerical simulation method is used to study the air guiding system and quenching process parameters,used in the solution and quenching process,so as to guide the design of the precision shape control of shape control solid solution production line for thin-walled aluminum components and carry out experimental verification.In this paper,on the basis of the whole plate solid solution treatment jet heating technology,the flow field distribution of the whole plate workpiece and the frame ring component heating process is compared,and summarize the optimization direction of the thin-walled aluminum component jet heating furnace structure summarized.It is proposed to study the opening ratio of the upper air guide structure and increase the guide plate for the under air guide structure.Through the study of the wind guide structure and the comparison of various schemes,the results show that the better heating flow field can be obtained when the opening ratio of the upper air guide structure is 0.2,the air distribution on both sides of the guide plate is 2:1,and the height of 2/3 is 2:1.Based on the optimized air guide system,the influence of circulating air volume on the temperature uniformity of the effective heating zone of the solution furnace is studied.The results show that with the increase of the hot air circulation air volume,the furnace temperature uniformity first increases and then the improvement effect is not obvious.For the solution furnace in this paper,when the hot air circulation air volume is 66000 m3/h,the temperature uniformity of the furnace is on the premise,with good economy.The numerical calculation model of aluminum alloy thin-walled frame components during quenching process was established,and the temperature field,stress field and deformation in the process of air cooling,immersion quenching and spray quenching were studied.The results show that the fastest cooling rate of aluminum alloy thin-walled frame ring components,in the process of air cooling,is about 9.7?/s,which can not meet the minimum quenching speed requirements,so the transfer time of the components should be controlled within 2s;during the immersion quenching process,there is a large temperature difference in the components,the components have large size deformation,and the horizontal direction is elliptical deformation,and the thickness direction is bending deformation.When the quenching pressure is 300 kPa,the deformation of the whole component is almost 0.The above research results guide the production of precision shape control solid solution production line for thin-walled aluminum components.The results show that the temperature uniformity of the furnace can reach±2.75? under 66000 m3/h circulating air volume;The average heating rate is 1.8?/s and the maximum temperature difference is about 139.2?.The deformation size of aluminum alloy thin-walled frame ring components after solution quenching was measured.The deformation in vertical direction was very small,about 0,and the maximum deformation in horizontal direction was 19.5 mm.The precision shape control of thin-walled aluminum components during solution quenching was realized. |
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