Mold making room
Automatic direct injection wax machine
Vertical double-station wax injection machine
Mixer and sand sprayer
Dewaxing kettle
Medium frequency induction melting furnace
Shell roasting box furnace
Vibration shelling machine
Investment casting manufacturing process flow
Shell Building
Shell Drying Workshop
Wax Mold Removal
The shell making process is a full silica sol process (due to environmental issues, the water glass process has been gradually eliminated), that is, the surface of the wax mold is first dipped in prepared silica sol paint, and then sprinkled with refractory sand, and the shell is heated at a specific temperature. Dry and harden under humidity, thus forming a dense refractory coating on the surface of the wax pattern, and then repeat this process for 5-6 times, and finally form a silica sol mold shell with a certain strength and refractory degree.
This process is a key step in precision casting. To ensure quality, it is necessary to pay attention to spreading the paint evenly and strictly control the viscosity of the paint, the particle size of the sand powder, and the temperature and humidity of the workshop.
Shell baking is mainly to burn off the remaining wax and moisture in the mold shell. At the same time, precision casting is poured in the red shell state. The mold shell is usually baked at about 1000 degrees for 1-2 hours.
Ingredients are made according to the material composition of the product, and then the molten steel is smelted, and the slag removal spectrum test is carried out. Once the composition is qualified, it can be poured. It is necessary to pour the molten steel into the mold shell in strict accordance with the requirements of the process card in the red shell state to form a gradual blank.
After the poured product is fully cooled, use manual (hammering) or vibration shelling machine to separate the mold shell from the casting to obtain the poured part.
After preliminary manual sand cleaning, shot blasting is performed, so that the mold shell on the surface of the casting blank is basically removed.
Cutting is to separate the casting products on the module from the gating system. All precision castings are plasma cut. Pay attention to the gate root not being too long. The key is not to cut the casting body.
Gate grinding is to remove the remaining gate root on the blank casting after cutting off the gating system. It is mainly grinded by grinding with a grinding wheel or an abrasive belt. This process is divided into preliminary grinding and fine grinding. Be careful not to damage it during grinding. Part body.
Finishing is mainly to repair some appearance defects that may exist on the surface of castings, such as sand holes, slag holes, flash burrs, deformation, etc. The main methods are welding repair, grinding, correction and shot blasting.
The finished castings are sent to the Quality Department for dimensional and visual inspection. Once they pass the requirements, they can be packaged and stored in the warehouse.
For the first batch of samples and products with special requirements from customers, we will conduct 100% penetrant testing, and the rest without special requirements will not be randomly inspected.
Investment Casting Foundry
