& nbsp; Low pressure casting process is a casting method that lies between pressure casting and gravity casting. Its basic principle is to introduce dry compressed air into a holding furnace containing liquid metal, which acts on the metal liquid surface at a certain temperature, causing the liquid metal to enter the sand mold cavity from bottom to top along the riser. After the metal liquid fills the cavity, the pressure is increased, and the gas pressure on the liquid surface is maintained until the casting is completely solidified, Then relieve the pressure and allow the unsealed metal liquid in the riser and runner to fall back into the holding furnace, completing a casting process. Obtain the required castings after unpacking. & nbsp; The metal sand mold dual station low-pressure casting equipment consists of a host, a holding furnace, and a liquid level pressure control system. The main machine is the same as a regular metal mold low-pressure casting machine. The insulation furnace can be lifted and moved. When the insulation furnace is under the static template of the main machine, the metal mold is installed on the main machine template for low-pressure pouring of the metal mold. After removing the insulation furnace from the host frame, it is used as a low-pressure pouring sand mold. The insulation furnace cover also serves as a working platform, and the made sand mold is directly fixed on the insulation furnace cover for pressure pouring. & nbsp; The operation process of the metal mold low-pressure casting machine is as follows: install the metal mold and lifting pipe, move the insulation furnace into the frame and rise it to be connected to the static mold seal, start the mold casting, and after the casting is completed and cooled, open the mold to take out the parts. & nbsp; The operation process of the sand mold low-pressure casting machine is as follows: move the insulation furnace out of the main frame, and the operator will lift the sand mold that has been formed and closed on the working platform of the insulation furnace. After achieving docking and sealing with the liquid lifting pipe mouth, pressure casting will begin, achieving fully automatic casting pressure process such as liquid lifting, mold filling, pressure increasing, pressure maintaining, and pressure relief. Then, lift the sand box off the working platform and unpack the parts.
