Classification of precision casting

        Ceramic mold casting: casting method for casting the casting production of the casting mold. Ceramic slurry by the hydrolysates of ethyl silicate and texture than the pure and thermal stability of high fine refractory sand such as hybrid electric melting quartz, zircon and corundum. In order to make ceramic slurry in a short period of time glue, often adding calcium hydroxide as a catalyst or Magnesium Oxide. Due to the use of the refractories ingredients and appearance are similar with ceramic, is called ceramic type. Ceramic mold casting is a new technology developed on the basis of ordinary sand casting. There are two types of ceramics: 1. The production process is the first shape is fixed on the plate, coat sand box, and then transfer a good ceramic slurry into the sand box, to be the plastic hardening the newcomer mode, calcined at high temperature to become namely casting. The use of bushing, the gap between the liner and the shape of the ceramic slurry casting mold. Liner can be used sand, also can use metal type. The ceramic shell can save a large amount of ceramic slurry, which is used in production. The surface roughness of the ceramic mold can reach 1.25 to microns, and the size of the ceramic casting can reach 3 to 5 grades. The ceramic mold casting production cycle is short, the metal utilization rate is high. The biggest can reach more than ten tons of castings, mainly used for casting large wall thickness precision castings and casting a single piece and small batch dies, forging dies, plastic mold, metal mold, die-casting mold, glass mold and other mold. The service life of the ceramic mold casting mould is comparable to that of the mould made by mechanical method, and the manufacturing cost is lower than that of the mould made by mechanical method.

        Sand casting: in all casting production, 60 ~ 70% of the casting is produced by sand, and about 70 per cent is clay sand production. The main reason is that the cost of sand casting is low compared with other casting method, simple production process, short production cycle. So like a car engine cylinder body, cylinder head, crankshaft castings are used clay wet sand production process. When the wet type can not meet the requirement to consider the use of clay sand table dry sand, dry sand mold or other. Wet clay sand casting casting weight can be from a few kilograms until tens of kilograms, but the clay does production of castings can be weighed dozens of tons.

        Generally speaking, for medium and large castings, cast iron can be used resin self hardening sand, steel castings can be water glass sand to produce, can obtain the precise size, smooth surface castings, but the cost is relatively high.

        Of course, sand casting production of precision casting, surface roughness, material density and microstructure and mechanical properties is often poor, so when the properties of casting requirements higher and other casting methods should be adopted, such as melt mold (lost wax casting, die-casting, low pressure casting and so on.