The characteristics and differences between the detailed description of various casting
Release Time::2014-09-03
1 cast also by pouring liquid metal into gravity casting and pressurecasting. Gravity casting is refers to the liquid metal injection mold process in the earth's gravity casting, also known as. The generalized gravity casting include sand casting, metal mold casting, investment casting, mud casting, metal type casting; specifically refers to the narrow sense gravity casting. Pressure casting is refers to the liquid metal in theother forces (without gravity) under the action of injection mold process.The generalized pressure casting including die-casting machine pressure casting and vacuum casting, low pressure die casting,centrifugal casting; metal pressure casting narrow special die casting machine casting, referred to as die casting. Xudong precision casting factory engaged in sand mold and metal mold gravity casting. Thecasting process is the most commonly used in non-ferrous metal casting,and relative price lowest.
2 sand casting is a sand as the main material, make the traditional mould casting process. General use of the gravity casting sand, there arespecial requirements can be used when the low pressure casting,centrifugal casting process. Sand casting wide adaptability, small, large,simple pieces, complex parts, single, mass are used. Sand castingmould, ever made of wood, as wood. Xudong precision casting factory for change to block deformation, easy to damage and other ills, except single production casting mold, all to size accuracy is higher, and longer service life of aluminum alloy die or resin mold. Although the price has increased, but still higher than the metal mold casting mould with much cheaper, in small batch and big production, the price advantage is particularly prominent. In addition, than metal type sand refractory degree is more high, and such as copper alloys and ferrous metals, high melting point material also adopt this technology. However, sand casting have also some disadvantages: because each sand casting gating only once, get after casting mould is damaged, should be re modeling, so the sand casting production efficiency is low; and because the overall properties of sand soft and porous, so the sand casting castingdimension accuracy is low, the surface is rough. However, the accumulation of many years of Xudong precision casting factorytechnology, has greatly improved the surface condition of sand castings,the blast and the effect after the metal mold casting rival.
3 metal casting is produced by modern technology of hollow casting diecasting alloy steel. Metal type can use gravity casting, also can use the pressure casting. Casting mold metal mold can be used repeatedly, eachpouring a molten metal, is a casting, long life, high production efficiency.Metal castings not only good dimension precision, surface finish, andpouring liquid metal in the same condition, the casting intensity higher than sand, it is not easy to damage. Therefore, in the mass production ofsmall castings, non-ferrous metal casting, as long as the melting point of material is not too high, generally preferred metal mould casting.However, the metal mold casting also has some shortcomings: becauseheat-resistant alloy steel and make a hollow cavity in which processing is relatively expensive, so the metal mold is not cheap, but the overall anddie-casting mold costs are much cheaper than. For small batchproduction, is allocated to each product on the mould cost is high, the general is not easy to accept. Because the die metal processing equipment, mold material by size and cavity casting equipment capacity constraints, so it is incapable of action for large castings. Therefore in small batch and big production, rarely using the metal mold casting. In addition, the metal mould while using heat-resistant alloy steel, but theheat capacity is still limited, generally used for casting aluminum alloy,zinc alloy, magnesium alloy, has been seldom used in copper alloycasting, and even fewer for ferrous metal casting. Metal type Xudong precision casting factory mold all is to design, manufacture, and moretimely provision of high quality die cheap, suitable for the customer.
4 die cast metal type pressure in the die casting machine casting, is currently the highest production efficiency of casting process. Die castingmachine 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 waste of materials, the production efficiency is higher than the cold chamber die casting machine, but the part heat-resisting ability restriction, at present can only be used in casting production of zinc alloy, magnesium alloy and other low melting point materials. The extensive use of aluminum alloy die castings, due to the high melting point, can only be produced in a cold chamber die casting machine. The main characteristics of liquid metal die casting is in high voltage, high speed filling cavity, and forming, under high pressuresolidification, deficiency of casting is: because of liquid metal in theprocess of high voltage, high speed cavity filling, inevitably to the cavity of the air wrapped in the casting, forming the pinhole, so the aluminum alloy die casting for heat treatment, zinc alloy die castings is plastic sprayed surface (but can be painted). Otherwise, casting internal hole in the above treatment heating, will expand when heated and the casting deformation or bubble. In addition, die casting mechanical machining allowance should also get smaller, generally in 0.5mm or so, can reduce casting weight, reduce cutting amount in order to reduce costs, and can avoid penetration surface dense layer, exposing subcutaneous blowhole,cause the scrap.