Precision casting is a casting method compared to conventional casting processes. It achieves relatively accurate shape and high casting accuracy. It is more common to first make an electrode of the desired blank (with little or no margin left) and then use the electrode to etch the mold body to form a cavity. The wax is then cast by casting to obtain the original wax pattern. A layer of high temperature resistant liquid sand is applied to the wax pattern. After obtaining a sufficient thickness, it is air-dried and then heated to dissolve the inner wax mold to obtain a cavity conforming to the desired blank. The cast iron water is poured into the cavity, and after the curing, the outer casing is peeled off to obtain a precisely manufactured product.
Lost wax casting, now known as investment casting, is a casting process with little or no cutting. It is an excellent process technology in the foundry industry and its application is very extensive. It is not only suitable for the casting of various types and various alloys, but also produces castings with higher dimensional accuracy and surface quality than other casting methods, and even castings that are difficult to cast by other casting methods, which are difficult to cast, are not easy to process. Can be cast by investment casting.
The practical application of modern investment casting methods in industrial production was in the 1940s. At that time, the development of aviation jet engines required the manufacture of heat-resistant alloy parts such as blades, impellers, nozzles, and the like, which were complex in shape, accurate in size, and smooth in surface. Since the heat-resistant alloy material is difficult to machine, the shape of the part is so complicated that it cannot be or is difficult to manufacture by other methods. Therefore, it is necessary to find a new and precise molding process, so that the lost wax casting which has been handed down from ancient times is passed through the materials and processes. Improvements, modern investment casting methods have gained important development on the basis of ancient techniques. Therefore, the development of the aviation industry has promoted the application of investment casting, and the continuous improvement and improvement of investment casting has also created favorable conditions for the aviation industry to further improve its performance.
In the 1950s and 1960s, China began to apply investment casting to industrial production. Since then, this advanced casting process has been greatly developed and has been widely used in the manufacturing industries of aviation, automobiles, machine tools, ships, internal combustion engines, steam turbines, telecommunications equipment, weapons, medical equipment and cutting tools, as well as in arts and crafts. Manufacture of goods.
Another advantage of the investment casting process is that it can cast complex castings of various alloys, particularly casting high temperature alloy castings. For example, the blade of a jet engine, its streamlined profile and cooling cavity, can hardly be formed by machining. The production by the investment casting process can not only achieve mass production, but also ensure the consistency of the castings, and avoid the stress concentration of the residual knives after machining.
The gate cup is a fundamental part of the casting technology, especially in relation to the development of the steel industry. The gate cup is one of the components of the smelting process equipment.
The gate cup is primarily used to guide the passage of liquid metal into the cavity. If the pouring cup arrangement is unreasonable, the casting may cause defects such as pores, trachoma, iron beans, slag eyes, shrinkage holes, cracks and insufficient pouring. Therefore, the correct choice of the structure and size of the sprue cup and the reasonable placement on the casting are an important task.