Precision casting is a precision modelling method to obtain the floorboard of the precision casting process.
It includes: investment casting, ceramic mold casting, metal mold casting, pressure casting, lost foam casting.
Among the more commonly used is the investment casting, also known as the lost wax casting: choose appropriate casting material (such as paraffin) manufacturing investment; Touch on casting refractory coating and sand and refractory process, sclerosis type shell and dry; Then the internal casting melt away, get the cavity; Roasting shell in order to obtain enough strength, and the casting material, burning residual; Casting need metal materials; After shelling solidification cooling, deoxidization, can achieve the high precision finished products. According to the requirements of the product or heat treatment and cold working and surface treatment.
Precision casting and lost wax casting, its products are precision, complex, close to the final shape, can not machining or rarely used directly, so the investment casting is an advanced technology of formed near net shape.
In ancient China: Wang Ziwu ding banned, copper, bronze lions and so on, is the masterpiece of investment casting. Investment casting is used for industrial production since the 1940 s, after half a century has been developing at a rapid pace. Especially the European and American countries has developed rapidly. Department of investment casting used in aviation, weapons, is applied to almost all industrial sectors, particularly in the electronics, petroleum, chemical, energy, transportation, light industry, textile, pharmaceutical, medical equipment, pump and valve etc. In recent years is rapid development in our country.
Casting technology development makes the investment casting can not only production of small-sized castings, and can produce large castings, the largest outline of investment castings nearly 2 m size, and the minimum wall thickness is less than 2 mm. At the same time also more precision investment castings, in addition to the linear tolerance, parts can achieve higher geometry tolerance. The surface roughness of the investment castings is becoming more and more small, can achieve Ra0.4 microns.
In all casting production, 60 to 70% of the casting is made of sand mold production, and about 70% of them are using clay sand mold production. The main reason is that sand mold casting compared with other casting method of low cost, simple production process, short production cycle. So like a car engine cylinder block, cylinder head, crankshaft, etc are of clay green sand casting process. When wet can't meet the requirements to consider using clay sand table dry sand, dry sand mold or other mould. Coatings for green sand mold casting can be from a few kilograms to tens of kilograms of weight, and clay dry production castings can weigh up to dozens of tons.
In general, for medium and large castings, cast iron pieces can use resin self-hardening sand mold casting parts can be production of water glass sand mold, can obtain the size precision, smooth surface castings, but the cost is higher.
And, of course, the sand mold casting production casting accuracy, surface finish, material density and microstructure and mechanical properties are often poor, so when casting these performance requirements higher, other casting method should be used, such as casting, lost wax casting, die casting, low pressure casting and so on.
Precision casting foundry industry is the world leader, as a representative of the foundry industry in high-tech field, a model of precision casting must play its role and take the lead role, but the precision casting to give play to the role of the two big premise is strong, so the precision casting in our country should be the priority of development, development needs to be established policy and development goal, precision casting industry is the development goal of the following aspects: 
First, the finish on the pattern of economic growth by labor and resource intensive to technology, capital intensive, from the extensive polluting to green intensive, product quality, variety, quantity, and the world advanced level, the rapid increase of the proportion of high quality material the whole precision casting factory production efficiency and economic benefit have multiplied; Environmental pollution effectively, the initial set up and the environment coordinated China casting materials industry system.
Second, form some reasonable structure, high level of overall production, combined with the research and development and education training base, can constantly to the enterprise transportation professionals, continually develop high quality, high grade casting material varieties, to meet the increasing needs of the casting material, gradually increase the intensity of the export of technology at the same time.
Third, we should complete the adjustment of industrial structure, eliminate a number of technical level is low, poor quality of products, serious pollution, bad economic benefit of small precision casting factory, form the relatively centralized "small giant" and "star enterprise", "specialized, large-
Precision casting industry could reach the development goal of the above, strengthen ourselves, so the precision casting industry will play it in the casting on the cutting edge exemplary and leading role of the industry, and drive the development of foundry industry.
Precision Casting Manufacturer, Sand Casting Supplier, EPC Casting Products – SW MACHINERY
SW MACHINERY is a professional manufacturer and supplier of Precision casting, Sand Casting and EPC Casting in Qingdao, China.
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