论文部分内容阅读
通过对薄细长细晶低压涡轮工作叶片浇冒系统、型壳预热温度、型壳保温方式和浇注温度的调整,研究了铸造工艺参数及浇冒系统对铸件浇不足、冷隔、晶粒度及缩松缺陷的影响。结果表明,采用填砂或保温毡包裹进行型壳保温,对叶片晶粒粗大、浇不足、冷隔和缩松等缺陷的影响相同。当型壳预热温度高于1 150℃时,导致细长叶片晶粒粗大;而当型壳预热温度为1 100℃,浇注温度为1 450℃时,容易出现浇不足和冷隔。当型壳预热温度为1 100℃,浇注温度为1 500℃时,能够有效避免冷隔、浇不足、晶粒粗大等缺陷,同时,通过浇冒系统改进,能够解决薄壁细长叶片缩松问题。
Through the adjustment of the thin slender, fine-grained and low-pressure turbine work blade runner system, the shell preheating temperature, the shell insulation method and the pouring temperature, the influence of the casting process parameters and the pouring and pouring system on casting insufficient casting, Degree and shrinkage defects. The results show that the use of sand packing or thermal insulation blanket shell insulation, the blade coarse grain, insufficient pouring, cold insulation and shrinkage defects such as the same. When the shell preheating temperature is higher than 1 150 ℃, the slender leaf grains are coarse. When the shell preheating temperature is 1 100 ℃ and the pouring temperature is 1 450 ℃, pouring is insufficient and the cold septum is easy to appear. When the shell preheating temperature is 1 100 ℃, the pouring temperature is 1500 ℃, it can effectively avoid such defects as cold septum, insufficient pouring, coarse grain and so on. At the same time, Song problems.