What is casting?

Casting is a method that liquid metal is poured into the casting cavity suitable for the shape of the part, and after cooling and solidification, the part or blank can be obtained The materials to be cast are mostly metals (such as copper, iron, aluminum, tin, lead, etc. ) is solid but heated into liquid, and the material of the mold can be sand, metal or even ceramics. \x0d\ casting type: \x0d\① sand casting process \ x0d \ x0d \ sand with different components can be divided into wet sand casting process and surface dry sand casting process, but not all sand can be used for casting. The advantage of \x0d\ is lower cost, because the sand used for molds can be reused; The disadvantage is that the mold is time-consuming, and the mold itself cannot be reused, and the finished product can only be obtained after it is destroyed. \x0d\② Metal mold casting method \x0d\ Use metal with higher melting point than raw materials to make molds. Among them, it is subdivided into gravity casting, low pressure casting and high pressure casting. \x0d\ is limited by the melting point of the mold, and the metal that can be cast is also limited. \x0d\③ Lost wax method \x0d\ This method can be external film casting method and solid casting method. \x0d\ First, copy the articles to be cast with wax, then immerse them in a cylinder filled with ceramics to dry, so that the wax copy is covered with a ceramic outer film, and repeat the above steps until the outer film is enough to support the casting process (about 1/4 inches to 1/8 inches), then melt the wax in the mold and pull it out of the mold. After that, the mold needs to be heated several times to enhance the hardness before casting. \x0d\ This method is accurate and can be used for casting high melting point metals (such as titanium). However, because ceramics are expensive, they need to be heated many times, and the production is complicated and the cost is quite expensive.