Fabricante de fundición de precisión de acero inoxidable.

La fundición de precisión de acero inoxidable también se llama fundición a la cera perdida., proceso de sol de sílice. Es un proceso de fundición que requiere menos corte de piezas o ningún mecanizado.. Es una excelente tecnología de proceso en la industria de la fundición., y su aplicación es muy amplia. No sólo es adecuado para fundición de diversos tipos y aleaciones., pero la precisión dimensional y la calidad de la superficie de las piezas fundidas producidas son superiores a las de otros métodos de fundición.. Complejo, resistente a altas temperaturas, Las piezas fundidas difíciles de procesar se pueden fundir mediante fundición a la cera perdida..

Development history of investment casting methods
Modern investment casting methods were practically applied in industrial production in the 1940s. At that time, the development of aviation jet engines required the manufacture of heat-resistant alloy parts such as blades, impellers and nozzles with complex shapes, precise dimensions and smooth surfaces. Because heat-resistant alloy materials are difficult to machine, and the shapes of parts are complex, they cannot be manufactured by other methods. Por lo tanto, it is necessary to find a new precision molding process, so learn from the ancient lost wax casting, after the improvement of materials and processes, modern investment casting methods have obtained important development on the basis of ancient processes.


Por lo tanto, the development of the aviation industry has promoted the application of investment casting, and the continuous improvement and perfection of investment casting has also created favorable conditions for the aviation industry to further improve its performance. my country began to apply investment casting to industrial production in the 1950s and 1960s. Since then, this advanced casting process has been greatly developed, and has been widely used in aviation, automóviles, machine tools, buques, internal combustion engines, gas turbines, telecommunications equipment, weapons, medical equipment, and cutting tools. It is also used in the manufacture of arts and crafts.

What is investment casting?
The so-called investment casting process is simply to use fusible materials (such as wax or plastic) to make a fusible model (referred to as investment or model). Coat several layers of special refractory paint on it, dry and harden to form an integral shell, then use steam or hot water to melt the model from the shell, and then place the shell in the sand box. Fill it with dry sand molding around it, and finally put the mold into the roasting furnace for high-temperature roasting (if a high-strength shell is used, the demolded shell can be roasted directly). After the mold or shell is fired, molten metal is poured into it to obtain a casting.

The dimensional accuracy of investment castings is high, generally up to CT4-6 (sand casting is CT10~13, die casting is CT5~7). Por supuesto, due to the complicated process of investment casting, there are many factors that affect the dimensional accuracy of castings. Por ejemplo, the shrinkage of the mold material, the deformation of the investment mold, the linear change of the shell in the heating and cooling process, the shrinkage of the alloy, and the deformation of the casting during the solidification process. Por lo tanto, although the dimensional accuracy of ordinary investment castings is relatively high, its consistency still needs to be improved (the dimensional consistency of castings using medium and high temperature wax materials should be improved a lot).

When pressing the investment mold, a pressure type with a high surface finish of the cavity is used, so the surface finish of the investment mold is also relatively high. Además, the shell is made of a refractory coating made of a special high-temperature resistant adhesive and refractory material, which is coated on the investment mold, and the inner surface of the cavity directly in contact with the molten metal has a high smoothness. Por lo tanto, the surface finish of investment castings is higher than that of ordinary castings, generally reaching Ra.1.6~3.2μm.

The biggest advantage of investment casting is that because investment castings have high dimensional accuracy and surface finish, it can reduce CNC machining work. Just leave a little machining allowance on the parts with higher requirements, and even some castings only leave grinding and polishing allowances, so they can be used without mechanical processing. It can be seen that the use of investment casting method can greatly save machine tool equipment and processing man-hours, and greatly save metal raw materials.

Another advantage of the investment casting method is that it can cast complex castings of various alloys, especially high-temperature alloy castings. Por ejemplo, the blade of a jet engine, its streamlined outline and cooling cavity, can hardly be formed by machining technology. Production with investment casting process can not only achieve mass production, ensure the consistency of castings, but also avoid the stress concentration of residual knife marks after machining.