| 铸造的加工余量一般比国外大1-3倍 |
| 添加时间：2019/12/19 15:10:23 浏览次数： |
| 工艺水平低、质量差 Low technology level and poor quality ①铸件加工余量大。由于缺乏科学的设计指导，工艺设计人员凭经验难以控制变形问题，铸造的加工余量一般比国外大1-3倍。加工余量大，铸件的能耗和原材料消耗严重，加工周期长，生产效率低，已成为制约行业发展的瓶颈。 ① large machining allowance of castings. Due to the lack of scientific design guidance, it is difficult for process designers to control the deformation by experience, and the machining allowance of casting is generally 1-3 times larger than that of foreign countries. Large machining allowance, serious energy consumption and raw material consumption of castings, long machining cycle and low production efficiency have become the bottleneck restricting the development of the industry. ②大型铸件偏析和夹杂物缺陷严重。大型铸钢件和大型钢锭在凝固结束后，在冒口根部、铸件的厚大断面存在宏观偏析、晶粒粗大问题。 The segregation and inclusion defects of large castings are serious. After the solidification of large steel castings and ingots, there are macrosegregation and coarse grains at the riser root and the thick section of castings. ③铸件裂纹问题严重。 ③ casting cracks are serious. ④浇注系统设计不合理。由于设计不当，存在卷气、夹杂等缺陷，导致铸件出品率和合格率低。 The design of pouring system is unreasonable. Due to the improper design, there are defects such as air entrainment and inclusion, resulting in low yield and qualified rate of castings. |
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