The so-called precision casting process, simply made with fusible material (such as wax or plastic) made of fusible model (referred to as investment or model), in which a number of layers of special refractory coating, after drying and hardening After a whole shell, and then steam or hot water from the shell in the melt off the model, and then put the shell in the sand box, filled with dry sand in its shape, and finally the mold into the roasting furnace after high temperature roasting (Such as the use of high-strength shell, you can not shape and the mold after the shell directly roasting), casting or shell after roasting, pouring molten metal in which to obtain precision castings.
Precision Casting Process Operating Procedures:
1, remove the wax tank from the insulation tank, installed in the double-bit hydraulic wax mold injection machine, the use of wax before the material should be removed and hard wax.
2, the mold on the press table on the table positioning, check the mold all the core position is correct, the mold injection wax mouth and the injection machine is the correct contact wax mouth.
3, check the mold opening and closing is smooth.
4, open the mold, spray thin layer of agent.
5, in accordance with the technical provisions of the adjustment press time cycle, including the injection pressure, injection temperature, holding time, cooling time.
6, each cycle is completed, out of the core, open the mold, carefully remove the wax mold, according to the requirements into the cooling water or storage plate. Note that the following defective wax mold should be scrapped:
A ：wax mold into the air, wax mold local muster; B： wax mold any part of the missing angle; C ；wax mold deformation can not be simply repaired; D ：size does not meet the requirements.
7, remove the mold on the remaining mold material, pay attention to only use bamboo knife, metal blade can not be used to remove residual mold material, to prevent mold cavity and sub-surface damage.
8, close the mold, the next suppression wax mold. Each class get off work or mold use is completed, the application of soft cloth or cotton swab cleaning mold, the use of screws to fasten the mold.