某燃机涡轮叶片精铸工艺研究

Production of Turbine Blade of Gas Engine by Investment Casting

某燃机涡轮工作叶片由于结构复杂,技术要求高,断漏芯、柱状晶、冶金夹杂等缺陷导致报废率很高。通过优化陶芯制造和自由端制作工艺,降低了断漏芯率;采用晶粒细化剂、包裹陶瓷棉等方法消除了排气边柱状晶缺陷;通过改变过滤网位置及控制浮渣,降低了冶金夹杂废品率,提高了该涡轮工作叶片的精铸品质。

Due to the complicated structure and high technical requirements,casting qualified rate of a gas turbine blade is very low,and the defects such as the core of the fault,the columnar crystal and the metallurgical inclusion are very high.Through the optimization of ceramic core manufacturing and the production process for the free end,the age rate of broken core is reduced.The grain refining agent and the method of wrapping the ceramic fibre were used to eliminate the columnar crystal defect at the exhausting side.By changing the filter network position and controlling dross,the metallurgical slag scrap rate was decreased.Based on the mentioned above,the quality of investment casting turbine blade was improved.