阿里巴巴Crystallization under pressure
压力下结晶
The shell is placed in the pressure tank for pouring, after the end, the pressure tank is immediately closed, and high pressure air or inert gas is injected into the tank to make the casting solidify under pressure to increase the density of the casting.
将型壳放在压力罐内进行浇注，结束后，立即封闭压力罐，向罐内通入高压空气或惰性气体，使铸件在压力下凝固，以增大铸件的致密度。
The maximum pressure in foreign countries has reached 150atm.
在国外最大压力已达150atm。
4) Directional crystallization (directional solidification)
4）定向结晶（定向凝固）
Some investment castings such as turbine blades, magnetic steel, etc., if their crystalline structure is arranged in a certain direction of columnar crystals, their performance can be improved a lot, so investment casting directional crystallization technology is rapidly developing.
一些熔模铸件如涡轮机叶片、磁钢等，如果它们的结晶组织是按一定方向排列的柱状晶，它们的工作性能便可提高很多，所以熔模铸造定向结晶技术正迅速地得到发展。
Cleaning of investment castings
熔模铸件的清理
The cleaning content of investment casting is mainly: (1) Remove the shell from the casting;
熔模铸件清理的内容主要为：（1）从铸件上清除型壳；
(2) Remove castings from the self-pouring system;
（2）自浇冒系统上取下铸件；
(3) Remove the shell refractory adhered to the casting;
（3）去除铸件上所粘附的型壳耐火材料；
(4) Cleaning of castings after heat treatment, such as removing oxide skin, edge and cutting gate residues.
（4）铸件热处理后的清理，如除氧化皮、尽边和切割浇口残余等。