Composite Integrated Manufacturing Process for Large-diameter Aluminum Alloy Bellows
In order to obtain aluminum alloy bellows with large diameter,large expansion rate and small wall thickness reduction rate,a composite integral manufacturing process is proposed.The core idea is to obtain the initial tube blank by friction stir welding,and then the required continuous waveform is formed by axial low pressure forming method.Firstly,the plate welding test was carried out to determine the optimum process parameters of friction stir welding.Based on ABAQUS software,the finite element model of the axial low pressure forming method was established.Based on the shape accuracy and wall thickness distribution after the forming method,the influence of different process parameters was analyzed,and the best matching relationship between the forming internal pressure and the axial feed was obtained.Finally,the static test was carried out.The results show that the composite integral manufacturing process can obtain the aluminum alloy bellows with large diameter and large expansion rate that meet the design requirements,and has the advantages of low cost and high efficiency.
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