Advantage of Precision Casting Method

The modern Investment precision casting method has been applied in industrial production in the twentieth-century forties. At that time the development of jet engines, require manufacturers such as blades, impellers, nozzles, and other complex shapes, size, precision, and smooth surface of the heat-resistant alloy parts. As the heat-resistant alloy machining difficult, complex shape parts, which can not or difficult to use other methods of manufacture, therefore, needed to find a new precision in the molding process, so learn the ancient lost wax handed down from precision casting, through to the materials and Process Improvement, modern methods of precision casting based on the ancient craft was an important development. Therefore, the development of the aviation industry to promote the application of precision casting, precision casting, and continuous improvement and perfection, but also further improve the performance of the aviation industry has created favorable conditions.

China is in the last century, the fifties and sixties began casting for industrial production. Later this advanced steel casting process has been tremendous development, one after another in the aerospace, automotive, machine tools, ships, internal combustion engines, gas turbine, telecommunications equipment, weapons, medical equipment and cutting tools and other manufacturing industries that are widely used, but also for arts and crafts manufacturing.

The so-called precision casting China process simply is to use fusible materials (such as wax or plastic) made of fusible models (Rong mold or model), on which the fire-resistant coating Ruogan layer of special coating, drying and hardening after the formation of After a whole shell, and then steam or hot water from the melting of the shell model, and then placed in sandbox shell, filled with dry sand in the molding around it, and finally cast into the roaster in the high-temperature calcination (such as high strength shell, it can not form the shell after the stripping direct baking), the mold or shell after roasting, after which pouring molten metal and are casting.

High dimensional accuracy of castings, generally up to CT4-6, of course, steel casting process as complex factors that affect the dimensional accuracy of castings more materials such as mold shrinkage, melting mode of deformation, heating and cooling in the shell Variation of the line process, the alloy solidification shrinkage and deformation of the casting process, so the size of ordinary investment casting precision are higher, but still, need to improve their consistency (using in high-temperature materials in the casting size wax consistency to improve the lot).

Suppression of melting mode, the cavity surface finish using high-pressure type, therefore, melting mold surface finish is relatively high. In addition, a special shell from the high-temperature binder and refractory material made into a fire-resistant coating Coating in Investment Scales and made direct contact with the molten metal surface finish cavity high. Therefore, the surface finish of castings precision castings than high, generally up to Ra.1.6 ~ 3.2μm.

Casting the biggest advantages is there as a high melting mold casting dimensional accuracy and surface finish, it can reduce the machining work, only in part on the site demanding to Leave a little machining allowance can be, and even some casting only stay grinding, polishing margin, can be used without machining. Thus, using the steel casting method can save a lot of machine tool equipment and processing time, a substantial savings of metal materials.

Another advantage of the precision iron casting method is that it can be all kinds of precision casting of complex alloy casting, precision casting special high-temperature alloy castings can be. Such as jet engine blades, their sleek profile and cooling outside the cavity, with the machining process almost impossible. With precision casting, technology can not only do mass production, ensures consistency in casting.