Lost wax casting is now called investment casting, is a kind of less cutting or no cutting casting process, is an excellent technology in the foundry industry, its application is very wide. It is not only suitable for various types, various alloys of casting, and the production of casting dimensional accuracy, surface quality is higher than other casting methods, and even other casting methods are difficult to cast complex, high temperature, not easy to process the casting, can be used in investment casting casting. Investment casting is in the ancient wax casting on the basis of the development. As an ancient civilization, China is one of the countries that use this technology earlier, as far back as hundreds of years BC, China's ancient working people created this lost wax casting technology, used to cast with a variety of fine patterns and text of bells and vessels and other products, such as Zenghouyi Zun plate during the Spring and Autumn period. Zeng Hou Yi Tomb Zun plate base for a number of intertwined dragons, their heads and tails, up and down the interlocking, forming the middle of the hollowed out multi-layer cloud pattern, these patterns with ordinary casting process is difficult to produce, and with the lost wax casting process, you can take advantage of paraffin wax does not have the strength, easy to carve the characteristics of the paraffin wax can be carved with ordinary tools and to get the Zeng Hou Yi Tomb Zun plate as paraffin wax crafts, then again! Additional casting system, paint, dewaxing, casting, you can get the exquisite Zeng Hou Yi Tomb Zun plate. Modern investment casting method in industrial production to get practical application is in the 1940s. At that time, the development of aviation jet engine, the requirements of manufacturing like blades, impellers, nozzles and other complex shapes, precise size and surface finish of heat-resistant alloy parts. Due to the heat-resistant alloy material is difficult to mechanical processing, the shape of the parts is complex, so can not or difficult to use other methods of manufacturing, therefore, the need to find a new precision molding process, so draw on the lost wax casting handed down from ancient times, after the improvement of the material and process, the modern investment casting method in the ancient process on the basis of the development of the importance of the process. Therefore, the development of aviation industry promotes the application of investment casting, and the continuous improvement and perfection of investment casting, also for the aviation industry to further improve the performance to create favorable conditions. Our country is in the 1950s and 1960s in the last century began to melt mold casting applied to industrial production. After this advanced casting process has been huge development, successively in aviation, automobile, machine tools, ships, internal combustion engines, gas turbines, telecommunications instruments, weapons, medical equipment and cutting tools and other manufacturing industry is widely used, but also for the manufacture of arts and crafts. The so-called investment casting process, simply put, is to use fusible materials (such as wax or plastic) made of fusible model (referred to as the mold or model), coated with a number of layers of special fire-resistant coatings, after drying and hardening to form a whole shell, and then steam or hot water from the shell to melt off the model, and then placed in the shell in the sand box, filled with dry sand modeling in the surroundings, and finally the casting model into the roaster through the High-temperature roasting (such as the use of high-strength shell, can not be modeling and will be directly after the mold shell roasting), casting or shell by the roasting, in which the casting is poured into the molten metal and get castings. Molten mold casting dimensional accuracy is high, generally up to CT4-6 (sand casting for CT10~13, die casting for CT5~7), of course, due to the complexity of the process of molten mold casting, affecting the casting dimensional accuracy of more factors, such as mold material shrinkage, deformation of the molten mold, shell in the heating and cooling process of the line amount of changes in the alloy of shrinkage as well as deformation of casting in the solidification process, etc., so the ordinary Although the dimensional accuracy of the molten mold castings is high, its consistency still needs to be improved (the dimensional consistency of the castings using medium and high temperature wax materials should be improved a lot). When pressing the molten mold, the press mold with high surface finish of the cavity is used. In addition, the mold shell is made of high-temperature-resistant special binder and refractory material formulated as refractory coating coated on the molten mold, and the surface finish inside the cavity that is in direct contact with the molten metal is high. Therefore, the surface finish of the molten mold castings than the general casting parts of the high, generally up to Ra.1.6 ~ 3.2 μm. The biggest advantage of molten mold casting is that due to the molten mold castings have a very high dimensional accuracy and surface finish, so you can reduce the machining work, just in the parts of the higher requirements of the parts to leave a little machining allowances can be, and even some castings only left grinding, polishing allowances, do not have to machining Can be used. This shows that the use of investment casting method can save a lot of machine tool equipment and processing time, substantial savings in metal raw materials. Another advantage of investment casting method is that it can cast a variety of alloys of complex castings, especially casting high temperature alloy castings. Such as jet engine blades, its streamlined profile and cooling with the inner cavity, with machining process is almost impossible to form. With investment casting process can not only do mass production, to ensure the consistency of the castings, and avoid the residual knife pattern after machining stress concentration.
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