Various practices in the foundry industry
1. casting can also be divided into gravity casting and pressure casting according to the pouring process of molten metal. Gravity casting is the process of pouring molten metal into the mold under the action of gravity of the earth, also called casting. The generalized gravity casting include sand casting, metal mold casting, investment casting, mud casting; metal type casting refers to narrow gravity casting. Pressure casting is the process of pouring molten metal into other molds under the influence of other external forces (without gravity). Generalized pressure casting, including die-casting machine pressure casting and vacuum casting, low pressure casting, centrifugal casting, etc., narrow pressure casting, special press casting machine metal mold pressure casting, referred to as die casting. These kinds of casting process are the most commonly used and the lowest relative price in nonferrous metal casting at present.
2. sand casting is a traditional casting process using sand as the main molding material. Sand casting usually adopts gravity casting. When there are special requirements, low pressure casting and centrifugal casting can also be used. 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 improved, but still more expensive than the die casting mold, in small quantities and large production, the price advantage is particularly prominent. In addition, the sand mold is more refractory than the metal mold, and therefore, the melting point of materials such as copper alloy and ferrous metal is more often adopted. 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 years of Xudong precision casting factory technology, has greatly improved the surface condition of sand castings, the blasting effect after the metal mold casting rival.
3. metal mould casting is a kind of modern mould for casting hollow casting mould made of heat-resisting alloy steel. The metal mold can be either gravity casting or pressure casting. The metal mold can be used many times, and every casting of molten metal gets a cast. It has a long life and a high production efficiency. The casting of metal mould not only has good size precision, smooth surface, but also has higher casting strength than sand mold and less damage. Therefore, in the production of large quantities of non-ferrous metal, small castings, as long as the melting point of the material is not too high, generally preferred to use metal mold 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, the cost of tooling to each product is obviously too high and generally difficult to accept. Because the metal mold is affected by the mold material size and the cavity processing equipment and casting equipment capacity, so it is helpless for the particularly large castings. As a result, metal casting is seldom used in small and large production. In addition, although the metal mould adopts heat resistant alloy steel, but the heat capacity is still limited, generally used for casting Aluminum Alloy, zinc alloy, magnesium alloy, copper alloy casting has been used less, and less for black metal casting. Metal Xudong precision casting factory mold is all designed and manufactured, which can timely provide quality cheap, suitable for the customer mold.
