Guangdong Machinery processing plant Squeeze casting, also known as liquid metal forging, is a process combining casting and forging. The liquid metal is poured into the bottom of the half mold of the preheated metal mold. When the metal begins to solidify, the upper half mold closes and provides pressure in the solidification process, which is significantly lower than the pressure used in forging. Therefore, the important parts are produced, and the core is used to form holes and recesses in this process. Low porosity leads to improved mechanical properties. Iron based and non iron based materials can be produced by this method.
The basic steps of this process in Guangdong mechanical processing plant include (Fig. 6.12)

Lost foam casting
EPC can produce products with complex structure. This process can produce complex parts and reduce the machining amount of parts produced by EPC. In order to prepare lost foam castings, Guangdong machinery processing plant first needs to prepare foam materials that need to complete parts. The pattern is immersed in an aqueous solution containing a suspended refractory material. The refractory material is covered with foam material to form a thin heat resistant layer. Pour molding sand around the pattern and give mechanical support to the thin refractory layer. Then molten metal is poured into the mold, molten metal melts and vaporizes the foam material. So it is called lost foam casting. The EPC process was put forward by H.F. Shroyer in 1958, and patent protection was made by casting a cavity with a polystyrene foam pattern embedded in the traditional sand mold. The polystyrene foam pattern in the sand mold is decomposed through the pouring of molten metal. Metal replace foam pattern to accurately reproduce all features of the original pattern. Like other investment casting methods, each casting needs a pattern, because the pattern will disappear in the process. The basic steps of this process include (Fig. 6.13)

1. Use foam molding press to make foam material model and pouring system.
2, foam models and gating systems are glued together to form clusters of models.
3. The formed clusters are covered with permeable refractories and heated under controlled conditions.
4. The dry, covered clusters are investment molded in a sandbox containing loose, binder free sand, which is used to vibrate to provide high compactness.
5. Liquid metal is poured from the upper part of the gating system. The gating system enables liquid metal to pass through clusters and replace foam inner runner and model.
6. The other operations such as box beating, cutting, grinding and heat treatment are simple, similar to other casting processes.
Generally, all iron-based and non-iron-based materials can be cast by EPC process in Guangdong mechanical processing plant. Because the EPC and gating system must be separated in the gradual production process, the metal pouring temperature is usually required to be more than 1000F, and low-temperature liquid metal can also be poured, but the size of parts is limited. In addition, low-carbon iron-based castings need special process.