Casting is one of the oldest procedures for metal. A nu […]
Casting is one of the oldest procedures for metal. A number of products are formed using this method. Here is an attempt to share casting knowledge.
Casting is one of four types: sand casting, permanent molding, gypsum casting and die casting. All of these types of castings have their own advantages and disadvantages. Select a casting according to the desired product properties.
Sand casting: Sand casting is the casting of the oldest castings. This casting method has been used since 1950. The texture of the product depends on the sand used for casting. The finished product is smoothed. Iron, steel, bronze, brass, aluminum, and magnesium alloys, which typically include lead, tin and zinc, are commonly used.
Permanent mold casting: permanent mold casting using two molds. The molds are joined together and the molten metal is injected into the mold. The hot metal is allowed to cool and the mold pieces are separated. Some products have metal extrusions that are polished by flash or manually removed. Tin, lead and zinc are usually molded using this method.
Gypsum Casting: Casting gypsum is one of the simplest methods. How it works for low melting metals like coper, zinc and aluminum. This is the simplest process, because if the brake in the program, you can easily manufacture mold.
Die Casting: Die casting is performed by introducing molten metal into a mold under high or low pressure. Earlier only low-pressure die-casting, but now use more pressure on high-pressure casting. The molds are well designed to provide complex products with amazing precision and smooth finish. They are made of high quality steel, because the steel has a high melting point. These molds can be reused thousands of times. The casting may be a single chamber, which produces only a single part, a plurality of chambers, which produce a plurality of identical parts at one time, the unit mold producing different parts, and the combining molds producing different parts at once. Typically, zinc, copper, aluminum, magnesium, lead, tin and tin-based alloys are used for die casting.
The use of die-casting products we can make non-porous products, do not allow gas through them, make them strong. Two types of machines are used for die casting. Cold room and hot chamber die casting.
Hot chamber die casting for high flow metals. First, the gooseneck is used to collect the molten metal, and then the metal is injected into the mold. The advantage of this method is that the cycle / minute increases. But the disadvantage is the high melting point metal and aluminum-ho iron particles.
Cold chamber die casting can not be used for hot places. In this process, the molten metal is transferred to the injector, which then injects the metal into the mold. A metal having a high melting point may be die cast using this method, but has the disadvantage that it is slower than the hot chamber process.