The dewaxing autoclave is a kind of equipment used to remove wax in the process of lost wax casting, which belongs to the casting equipment. Lost-wax casting is a common casting process, and its manufacturing process is divided into mold making, mold dipping, dewaxing, drying, sintering, pouring, cooling, demolding and other processes.

After a series of coating and drying processes, the wax patterns inside the the shell need to be removed before pouring metal into the shell, as to ensure the quality of the investment casting, that is the dewaxing. The dewaxing of the silicon sol mold shell is an important step in determining the quality of the finished product, which affects the quality of the mold shell and the final casting, and needs to be carried out with caution.

The FUGE dewaxing autoclave integrates the electric steam boiler and the dewaxing kettle, and uses high-pressure steam to quickly penetrate the surface of the mold shell, so that the wax mold melts in an instant and creates gaps. In this way, when the wax mold expands due to heating, these gaps can effectively absorb the expansion force, thereby preventing cracks in the mold shell. The advantage of the FUGE dewaxing autoclave is the increase speed of steam pressure, which needs to reach 0.5-0.6MPa in a short time (about 10-15 seconds) to ensure the rapid melting of the wax mold and the formation of gaps. The FUGE dewaxing autoclave is a double-layer pressure vessel with fast pressure balance, and the pressure balance time can be adjusted under certain circumstances. This ensures that the space inside the mold can be used for pouring metal, thereby producing precision castings.

However, the mold shell quality after dewaxing is not only determined by the dewaxing process. The quality of the mold shell itself, especially the degree of drying, is also crucial. If the mold shell is not dried sufficiently, it may crack during dewaxing. Therefore, it must be fully dried after each layer of coating and dried for at least 24 hours after the last layer of material. For products with special structures such as deep holes and narrow grooves, the drying time may be longer.

In addition, the smoothness of wax discharge is also an important factor affecting the shell quality. If the wax discharge is not smooth, it may also cause the mold shell to crack. For products with complex shapes, as well as thick and large products, the mold shell thickness should be increased, and additional wax outlets are required to reduce dewaxing defects. Smooth wax discharge can reduce cracking. Complex-shaped products’s thickness need to be added and additional wax outlets should be configured to reduce the risk of defects.

Finally, it is worth noting that the problem of residual baking that may exist during the dewaxing process will also have an adverse effect on the quality of the casting. Therefore, when designing the dewaxing process, it is necessary to comprehensively consider multiple factors, including the design of the wax mold casting system, the thickness of the mold shell, the drying quality, and the pressure increase speed of the dewaxing autoclave.

In the precision casting process, the dewaxing autoclave is one of the indispensable equipment. A good dewaxing kettle can ensure the quality, shape and dimensional accuracy of the casting, and can eliminate defects in the mold before casting. This reduces subsequent processing and recasting, improves production efficiency and reduces production costs.

FUGE dewaxing autoclave uses both automatic and manual control modes, easy to operate; it uses Siemens PLC programmable controller, which has strong anti-interference ability and stable system; in addition, it can be equipped with energy recovery device to save costs; with its unique and stable technical advantages, it is specially designed to escort the production of high-end precision castings such as automobiles and aviation parts.