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某产品为分体组合结构,由上壳体和下壳体组成,采用螺纹连接,其中下壳体为装配焊接件,结构较为复杂,且组合壳体又有较高同轴度精度要求,在加工时易出现同轴度超差,加工废品率较高。通过优化调整加工工艺,减少装夹次数,消除了累积装夹误差;通过调整装夹定位基准,改进夹具结构,提高了装夹精度;通过延长下壳体套筒焊接后自然时效时间,消除焊接残余应力,避免了因焊接应力引起的壳体加工变形;通过优化切削参数,降低切削力,防止了下壳体装配件薄壁套筒的加工变形。通过以上工艺技术改进,提高了壳体加工精度,使组合壳体同轴度加工精度满足了产品设计要求。
A product for the split combination structure, the upper shell and the lower shell composition, the use of threaded connections, including the lower shell for the assembly of welding parts, the structure is more complex, and the combination of shell and a higher coaxial accuracy requirements in the Processing prone to coaxial over tolerance, processing scrap rate higher. By optimizing and adjusting the processing technology to reduce the number of clamping times and eliminate the cumulative clamping error, the clamping fixture can be improved by adjusting the clamping positioning datum, and the precision of clamping can be improved. The welding can be eliminated by prolonging the natural aging time of the welding of the lower shell sleeve The residual stress avoids the deformation of the shell caused by the welding stress. By optimizing the cutting parameters and reducing the cutting force, the deformation of the thin-walled sleeve of the lower shell fitting is prevented. Through the above process and technology improvement, the processing precision of the shell is improved, and the concentricity machining precision of the shell body meets the product design requirements.