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针对某类壁厚较薄的Ni3Al基高温合金复杂结构件在铸造过程中合格率低的问题,进行了铸造工艺改进研究。主要对蜡质模型的质量把控、浇注参数以及整个浇注系统三方面进行了优化。蜡模制备过程中利用蜡料填充以及冷蜡块等技术;浇注前壳型进行预热,温度控制在(1 100±10)℃,浇注过程中温度控制在(1 460±10)℃。经改进后,此类薄壁复杂结构件铸造过程浇不足、缩孔以及裂纹等缺陷显著减少,铸件合格率得到提升。
Aiming at the problem of the low pass rate of Ni3Al-based superalloy complex structure with a thin wall thickness, the improvement of casting process was studied. The quality control of the waxy model, the pouring parameters and the whole pouring system are mainly optimized. In the process of wax mold preparation, wax wax stuffing and cold wax block are used in the process of preparation. Preheating is carried out on the shell before pouring, the temperature is controlled at (1,100 ± 10) ° C, and the temperature is controlled at (1,460 ± 10) ° C during pouring. After the improvement, such thin-walled complex structure of the casting process of casting inadequate shrinkage and cracks and other defects significantly reduced the casting qualification rate has been improved.