Tuesday, July 31, 2012

Casting work

Casting work can also be in accordance with molten metal pouring technology for gravity casting and casting pressure. Gravity casting refers to the liquid metal in the earth under the action of gravity into the casting process, also known as casting. Generalized casting craft books
Gravity casting sand casting, metal casting, investment casting, slime mold casting work; narrow sense refers to metal type casting gravity casting. Pressure casting is refers to the liquid metal in the other forces ( not including under the action of gravity ) into the casting process. Generalized pressure casting including die casting machine pressure casting and vacuum casting, low pressure casting, centrifugal casting, pressure casting; narrow sense only pressure casting machine metal pressure casting, referred to as die casting. The casting process is the most commonly used in non-ferrous metal casting, is also relatively lowest price.
Sand casting
Sand casting work is a kind of sand as main materials, making the traditional mold casting process. Sand is a gravity casting, there are special requirements can also be used for low pressure casting, centrifugal casting process. Sand casting wide adaptability, small, large, simple, complex, a single, large quantities can be used. Sand casting mold, used for timber production, commonly known as the wood. Wood defect is easy deformation, easy to damage; in addition to a single production sand castings, can use the size with high precision, and long service life of aluminum alloy mold or mold in resin. Although the price rises somewhat, but still higher than the metal type mold for casting much cheaper, in small quantities and large production, the price advantage is particularly prominent. In addition, the sand than metal refractory degree is more higher, so such as copper alloys and ferrous metals such as high melting point material is the use of this technology. However, sand casting have also some disadvantages: because each sand casting mould can cast a casting mould, after the damage, must shape, so the sand mold casting production efficiency is low; and because the sand soft and porous nature of the whole, so the sand casting casting dimension precision is low, the surface is rough. However, Xudong precision casting factory set many years of technology accumulation, has been greatly improved by sand casting surface conditions, the blasting effect after comparable with metal mould casting. Casting process
Metal mold casting
Is the use of heat-resistant alloy steel making casting hollow casting mold of the modern technology. Metal mold gravity casting can be used, also can be used in pressure casting. Metal mold casting mold can be repeatedly used, each pouring a molten metal, is a casting, long service life, high production efficiency. Metal mold casting has good dimension precision, surface finish, and the same in the pouring liquid metal case, the strength of casting sand mold more than high, is not easy to damage. Therefore, in the mass production of non-ferrous metal, smallcastings work, as long as the melting point of the material is not too high, generally preferred metal mould casting. However, metal mold casting have also some disadvantages: because of heat-resistant alloy steel and on top of it to make the hollow cavity of processing are more expensive, so the metal mold is expensive, but overall and die casting costs are much cheaper than. For small batch production, is allocated to each product mold costs were too high, generally not acceptable. Because the metal mold by the mold material size and cavity machining equipment, casting equipment capacity constraints, so the particularly large castings is incapable of action. Thus in the small batch and large production, rarely used in metal mold casting. In addition, metal mold while using heat-resistant alloy steel, but the heat capacity is still limited, more commonly used in aluminum alloy, zinc alloy, magnesium alloy, copper alloy casting in less in application, and is used for ferrous metal casting is less. Xudong precision casting factory metal mould entirely on its own design, manufacture, and thus can more timely manner to provide customers with low cost, applicable quality mold.
Die casting is in die casting machine for metal pressure casting work, is currently the highest production efficiency of casting process. Die casting machine for hot chamber die casting machine and cold chamber die casting machine two. Hot chamber die casting machine has high automation degree, less material consumption, production efficiency than the cold chamber die casting machine is higher, but the mechanical heat capacity constraints, it is only used for zinc alloy, magnesium alloy and other low melting point materials casting production. The extensive use of aluminum alloy die castings, due to high melting point, only in the cold chamber die casting machine. Die casting is the main characteristics of liquid metal in the high voltage, high speed filling cavity, and is formed at high temperature, solidification, casting defects: because liquid metal in high pressure, high speed cavity filling process, inevitably put in a cavity of the air entrapped in casting work, forming a subcutaneous blowhole, so the aluminum alloy die casting for heat treatment, zinc alloy die castings for surface spray (but painting). Otherwise, internal porosity in casting for the treatment of heating, the thermal expansion due to deformation of castings or bubble. In addition, casting machining allowance should be made smaller, generally about 0.5mm, can reduce the weight of castings, reduce cutting amount in order to reduce the cost, but also can avoid the penetration of compact layer on the surface, exposing subcutaneous blowhole, causing the workpiece scrapped.

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