Analysis of Wettability of Investment Casting Coatings

The performance and shrinkage of the mold material in the grate, as well as the casting shrinkage rate, the mold for molding is manufactured, the semi-solid paste material is pressed into the mold by high pressure, and is solidified under high pressure and pressure This model has a short solidification time, high production efficiency, small shrinkage, and high dimensional accuracy. During the molding process, the pressure of the injection machine is adjusted according to the size, complexity, mold material properties, and pressure injection temperature. The molding head adopts a pneumatic pressure injection machine with a pressure of 0.3-0.6 MPa. The model adopts a hydraulic pressure injection machine with a pressure of 4-6 MPa.

The produced parts are including Auto parts，Agricultural machinery parts, construction scaffolding parts Marine valve and pump components and hydraulic parts etc. Architectural,Machinery,Medical; Food Machinery, Valves and so on. The material which we used Aluminium; Bronze; Brass; Copper; carbon steel; stainless steel and so on.

According to the requirements of process design, the pouring riser system and the castings are modeled according to the corresponding requirements. The prepared model and die are trimmed together with flash burrs and assembled to form a model tree. After assembly, electric welding blades are used to locally heat and weld the bonding area. This assembly method is simple and flexible, and can be freely Adjustment, strong adaptability. When molding the head, inserting a nut in the head of the die allows a hooked screw to be attached to it to facilitate the operation of the subsequent shelling process.

Since the wax-based molding material used is hydrophobic, in order to improve the wettability of the coating to the model, the model should first be cleaned with a cleaning liquid and then rinsed with fresh water. The cleaned model tree is impregnated with fire-retardant paint, sprinkled with a granular refractory material, and dried and hardened. During this time, special attention is paid to the position of the holes, slots and sipes of the casting, so as to ensure that the coating is densely packed until the refractory material layer reaches With a certain thickness, it is allowed to stand for a period of time to fully dry and harden, and then dewaxed to give a shell that forms a casting.