精密铸造基本概念
它包括:熔模铸造、陶瓷型铸造、金属型铸造、压力铸造、消失模铸造。
It includes investment casting, ceramic casting, metal casting, pressure casting and lost foam casting.
其中较为常用的是熔模铸造,也称失蜡铸造:选用适宜的熔模材料(如石蜡)制造熔模;在熔模上重复沾耐火涂料与撒耐火砂工序,硬化型壳及干燥;再将内部的熔模溶化掉,获得型腔;焙烧型壳以获得足够的强度,及烧掉残余的熔模材料,;浇注所需要的金属材料;凝固冷却,脱壳后清砂,从而获得高精度的成品。根据产品需要或进行热处理与冷加工和表面处理。
Among them, investment casting is more commonly used, also known as wax-loss casting: the appropriate investment casting materials (such as paraffin) are selected to make the investment casting; refractory coatings and spraying refractory sand process are repeated on the investment casting, hardening the shell and drying; then melting the internal investment mould to obtain the cavity; calcining the shell to obtain sufficient strength, and burning the residual. Mold materials, metal materials needed for pouring, solidification and cooling, sand removal after shelling, so as to obtain high-precision products. According to product requirements or heat treatment and cold processing and surface treatment.