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Gravity casting
Release date:2014-10-30 Clicks:247 Article author:
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1 made of metal material process required a lot of products, such as casting, forging, extrusion, rolling, drawing, punching, cutting, powder metallurgy and so on. The process of casting is the most basic and most commonly used and most widely.
2 the molten metal into the hollow mold making high temperature resistant materials, are products of expected shape after condensation, which is cast. The product obtained is casting.
3 according to the casting casting material is divided into black metal casting (including cast iron, cast steel and non-ferrous metal casting) (including Aluminum Alloy, copper alloy, zinc alloy, magnesium alloy, etc.). Nonferrous metal precision casting factory specializing in nonferrous metal casting, the key is Aluminum Alloy and zinc alloy casting.
There are 4 casting according to mold casting material for sand casting and metal mould. Precision casting factory are handy for these two kinds of casting process, and to design and manufacture the two kinds of casting mould.
5 casting can be divided into casting liquid metal gravity casting and pressure casting. Gravity casting refers to the liquid metal injection mold process in the earth's gravity, also known as casting. The generalized gravity casting include sand casting, metal mold casting, investment casting, die casting, mud casting; metal type casting refers to narrow gravity casting.Pressure casting is refers to the liquid metal in the other forces (including gravity) under the action of injection mold process. Generalized pressure casting die casting machine including pressure casting and vacuum casting, low pressure casting, centrifugal casting; metal pressure casting narrow die casting machine casting, referred to as die casting. Precision casting factory engaged in sand mold and metal mold gravity casting. The casting process is the most commonly used in non-ferrous metal casting, but also the relative price lowest.
6 sand casting is a sand as the main materials, make the traditional mould casting process. General use of the gravity casting sand, with special requirements can be used when low pressure casting, centrifugal casting process. Sand casting wide adaptability, large and small, simple, complex parts, single and mass are used. Sand casting mould, formerly made of wood, as wood. Xudong precision casting factory in order to change the block deformation and easy to damage other ills, in addition to sand casting production of single, all to the higher dimensional accuracy, and long service life Aluminum Alloy mold or resin mold. Although the price has increased, but still higher than the metal casting mould with much cheaper, in small batch and big production, the price advantage is particularly prominent. In addition, the sand ratio of metal refractory degree is higher, and such as copper alloy and ferrous metal of high melting point materials also adopt this technology. However, sand casting also has some shortcomings: because each sand casting gating only once, get after casting mould is damaged, you must re shape, so the sand casting production efficiency is relatively low; and because the overall properties of sand is soft and porous, so the sand casting casting dimension precision is low, the surface is rough. However, the accumulation of many years of precision casting factory technology, has greatly improved the surface condition of sand castings, the blasting effect after the metal mold casting rival.
7 metal casting is produced with modern technology of hollow casting mold for casting heat-resistant alloy steel. Metal mould can use gravity casting, pressure casting can be used. Die cast metal type can be used repeatedly, each time pouring molten metal, get a casting, life is very long, the production efficiency is very high. The metal mould casting not only good dimensional accuracy, surface finish, and in the same pouring liquid metal under the condition of the casting strength higher than the sand, not easy to damage. Therefore, in the mass production of non-ferrous metal castings, castings, as long as the melting point is not too high, generally preferred metal casting. However, metal casting also has some shortcomings: because of heat resistant alloy steel and make a hollow cavity on the top of the processing is relatively expensive, so the metal mold is expensive, but the overall and casting mould are much cheaper than the cost. For small batch production, is allocated to each product on the mould cost was too high, generally not easy to accept. Because the type of metal mold processing equipment, mold material by size and cavity casting equipment capacity constraints, so it is incapable of action on large castings. Therefore in small batch and big production, rarely used in metal mould casting. In addition, although the metal mould adopts heat resistant alloy steel, but the heat capacity is still limited, generally used for casting Aluminum Alloy [1], zinc alloy, magnesium alloy, copper alloy casting has been used less, and less for black metal casting.
8 die casting metal mould in die casting machine pressure, is currently the highest production efficiency of the casting process. Die casting machine is divided into hot chamber die casting machine and cold chamber die casting machine two. Hot chamber die-casting machine a high degree of automation, less material consumption, the production efficiency is higher than the cold chamber die casting machine, but restricted by mechanical heat capacity, at present can only be used in casting production of zinc alloy, magnesium alloy and other low melting point materials. Aluminum Alloy nowadays widely used in die casting, due to the high melting point, can only be produced in a cold chamber die casting machine. The main characteristics of die casting is the molten metal in the cavity filling under high pressure and high speed, and under high pressure forming, solidification, deficiency of die casting is: because the liquid metal in the process of high pressure, high speed filling cavity, inevitably the cavity in the air wrapped in the castings, the formation of blowhole so Aluminum Alloy die casting for heat treatment, zinc alloy die casting surface spray (but not painting). Otherwise, casting internal hole in the above treatment when heated, the heat expansion and the casting deformation or bubble. In addition, die casting mechanical machining allowance should be made smaller, generally about 0.5mm, can reduce casting weight, reduce cutting amount to reduce the cost, but also can avoid the penetration of surface dense layer, exposing the blowhole, cause the scrap.