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Abstract：
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The causes of cracks on mold parting surface for sealing ring forgings in aero-engine were analyzed and verified by a combination of metallographic analysis, fracture analysis, finite element simulation and experimental verification. The results show that the cracks at transition R position of mold parting surface are mainly related to the sizes of pre-forging billet. When the local thickness of ring billet is larger, the difference of flow velocity at R position increases when the flash is formed by local excess metal during die forging process, and the additional stress also increases. However, the cracks occur when the sum of additional stresses and external forces exceeds the strength limit of material, and the values of corner radius r and bridge height of mold flash groove are a little small which increase the tendency of cracks. Thus, the process method for the wall thickness control of ring billet is improved with the maximum wall thickness no more than 21 mm, the bridge height of mold flash groove up to 8 mm and the corner radius up to 5 mm, meanwhile, the forging cracks are prevented efficiently by controlling the heating process of billet, the mold temperature, the lubrication and so on.
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Funds：
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AuthorIntro：
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秦婷婷（1991-），女，学士，工程师，E-mail：1808491537@qq.com
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Reference：
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