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以前,我公司生产的精密铸造碳钢件,因热处理氧化脱碳,铸件表面形成一层厚厚的氧化皮,抛丸时间增长,曾造成抛丸过度、铸字模糊,甚至铸件尺寸变小等废品。后来,采用装桶密封的方法,铸件表面质量有所改善,但力学性能不合格率高达17%,分析原因是铸件装在壁厚为3mm的不锈钢板桶中,还按原保温时间,铸
Previously, the precision cast carbon steel parts produced by our company were oxidized and decarburized by heat treatment to form a thick oxide layer on the surface of the castings. The shot blasting time was increased, which resulted in excessive shots, obscured castings and even smaller castings . Later, using the method of packing the barrel, the surface quality of the casting improved, but the failure rate of the mechanical properties was as high as 17%. The reason for the analysis was that the casting was installed in the stainless steel barrel with the wall thickness of 3mm,