论文部分内容阅读
空心微珠保温冒口目前已经广泛应用在中、小型铸钢件,补缩效果良好,其冒口套尺寸一般在φ500mm以下。但是,在大型铸钢件上应用,当冒口套尺寸在φ500mm以上,则存在熔蚀、炸裂现象。为此,我们进行了较长时间的研究与探讨,并在北京重型机器厂进行试验,分别在铸钢件上采用冒口尺寸为φ75mm、φ800mm及φ1270mm环形冒口,获得满意效果。一、保温冒口材料及配方 1.保温冒口材料组成 (1) 粉煤灰漂珠粉煤灰漂珠是火力发电厂排出的废物,它是一种颗粒细、质轻、耐高温、强度高、热稳定性好及空心的球形体。空心漂珠中SiO_2、Al_2O_3
Hollow bead insulation riser has been widely used in small and medium-sized castings, the effect of good packing, the riser sleeve size is generally φ500mm below. However, the application of large castings, when the riser sleeve size φ500mm above, there is the phenomenon of erosion, burst. To this end, we conducted a long time of research and discussion, and in Beijing Heavy Machinery Factory test, respectively, on the cast steel parts used riser size φ75mm, φ800mm and φ1270mm ring riser, to obtain satisfactory results. First, thermal riser materials and formulations 1. Insulating riser material composition (1) fly ash floating beads Fly ash floating fire power plant emissions is a waste, it is a fine grain, light weight, high temperature, strength High, good thermal stability and hollow spherical body. Hollow floating beads in the SiO_2, Al_2O_3