The process of investment casting

The process of investment casting:

1) Degreasing and degreasing of the die set

When wax-based mold material is used to make the investment casting, in order to improve the ability of the paint to wet the surface of the die set, it is necessary to remove the oil and dirt on the surface of the die set.

2) Hanging paint and sand on the module

Before hanging paint, the paint should be stirred evenly, minimize the precipitation of refractory material in the paint bucket, adjust the viscosity or specific gravity of the paint to make the paint fill and wet the mold well, hang the paint, immerse the module in the paint, and shake it up and down, so that the paint can wet the mold well. When hanging the coating, immerse the module in the coating and shake it up and down so that the coating can wet the mold well and cover the surface of the module evenly. After coating, sanding can be carried out.

3) shell drying and hardening

After each layer of shell is coated, it should be dried and hardened, so that the binder in the coating is transformed from sol to gel and gel, and the refractory material is connected together.

4) from the shell of the melt loss of molten mold

The shell is completely hardened, need to be melted from the shell of the module, because the module is commonly used in wax-based molding materials, so also known as this process is called dewaxing. According to the different heating methods, there are many, dewaxing method, used more is the hot water method and the same pressure steam method.

5) baking shell

such as the need for modeling (sand filling) casting, before baking, first after the molding of the shell buried in the box of sand, and then loaded with the furnace baking. If the shell high-temperature strength, do not need to molding casting, can be demolded after the shell directly into the furnace roasting. When roasting gradually increase the furnace temperature, the shell heated to 800-1000 ℃, insulation for a period of time, can be poured.

Mold casting process design task and its importance:

Mold casting is a kind of less cutting or no cutting casting process, in the past also known as the lost wax casting, because the castings produced by the casting process of the molten mold in the dimensional accuracy, the surface quality than the Because the castings produced by the investment casting process in terms of dimensional accuracy, surface quality are higher than other casting methods, in addition, the investment casting method can be completed some of the complexity of the casting production is not easy to process, so by the enterprise's favorite.

On the molten mold casting process, in the whole molten mold casting process, molten mold casting process design is one of the most important link, the link technical difficulty coefficient is big, for the whole molten mold casting process plays a very important significance, this is also the link is more for some professional, technical strong people's reason.