Silica sol casting methods include sand casting, special casting, casting, and V method casting. The casting in precision casting belongs to special casting. When we all cast silica sol, what is the process of silica sol casting?

The process of silica sol casting casting is as follows:

1. Pressed wax model

The processed wax paste is pressed into the mold cavity, the ice water is condensed by the ice water machine, and then taken out. After being placed in the pool for a period of time, a single wax mold is obtained after trimming inspection. Wax mold can be understood as a pressure casting part.

2. Manufacturing mold

The mold is used to press the shape of the casting. In order to ensure the quality of the wax mold, the mold must have high dimensional accuracy and a small surface roughness value.

3. Modification

The quality of wax mold, surface quality, and degree of deformation determine some important parameters of the product. Therefore, the wax mold workshop needs constant temperature control to minimize the deformation of the wax mold. At the same time, the surface of each wax mold needs to be inspected. The marks should be washed away, and the burrs, flashes and parting lines of the wax parts should be removed at the same time, and the minor defects should be repaired.

4. Combined wax model (group tree)

After the mold is repaired, in order to improve the productivity of the qualified single wax mold, the single wax mold is welded on the pre-made wax public casting system to form a wax module. Usually 2 to 80 wax patterns can be welded on a wax module.

Five, cleaning wax mold

The wax module after the tree formation can be cleaned after standing for more than 45 minutes. Before the shell slurry is made, the wax module after the number of sets must be cleaned to remove the surface wax and grease to improve the adhesion of the shell.

Six, manufacturing shell

After dipping the paint outside the wax mold, it is placed in the shell-making room to dry. The surface layer adopts the method of natural drying, and the transition layer and the back layer adopt the rotating air drying method to accelerate the drying. Repeat the coating 5-7 times (small castings) 5-6 layers, 6-9 layers for large castings.

7. Shell roasting, pouring, sand falling and cleaning

The dewaxed shell should be roasted during pouring. Put the shell into an oil furnace or electric furnace at 1100°C for 50 minutes. The main purpose is to remove the residual wax liquid after dewaxing and improve The strength and air permeability of the shell can prevent the shell from being deformed or broken during casting.

8. Dewaxing and wax treatment

Pour the mold shell into the steam dewaxing axe to melt the wax mold and flow out from below. It is separated by a water separator to collect the wax liquid, and put it in the dewatering bucket for further wax-water separation and removal of impurities in the wax.

When we all cast silica sol castings, we can follow the above casting process to cast. The correct method of silica sol casting is what we all need to do.