Dalian Wax Mould Precision Casting Plant-Dalian Yuchen Machinery Co., Ltd.

Investment castings are not only suitable for precision casting of various types and alloys, but also have higher dimensional accuracy and surface quality than other precision casting methods. Even complex, high temperature resistant and difficult to process castings which are difficult to obtain by other precision casting methods can be obtained by investment casting.

Dalian Wax Mold Precision Casting Plant - Dalian Yuchen Machinery has many years of investment casting experience: investment casting precision casting was developed on the basis of ancient wax casting. As an ancient civilized country, China was one of the areas where this technology was used earlier. Hundreds of years ago, the ancient working people of China created this wax-loss precision casting technology, which was used to precisely cast the bell tripod and utensils with various fine patterns and characters, such as the Zunpan of Zeng Houyi Tomb in the Spring and Autumn Period. The base of Zunpan of Zeng Houyi Tomb is a number of intertwined dragons, which connect head and tail, interlace up and down, and form a multi-layer moire pattern hollow in the middle. These patterns are difficult to produce by ordinary precision casting process, while the wax-loss precision casting process can make use of the characteristics of paraffin wax, which is not strong and easy to carve, and use ordinary. Tools can be used to carve the same paraffin-based crafts as the tray of the tomb of Zeng Houyi, and then add pouring system, paint, dewaxing, pouring, you can get the exquisite tray of the tomb of Zeng Houyi.

Dalian Wax Mold Precision Casting Plant - Dalian Yuchen Machinery pointed out that the modern investment casting method was applied in industrial production in the 1940s. At that time, the development of aero-jet engine required the manufacture of heat-resistant alloy parts with complex shape, precise size and smooth surface, such as blades, impellers and nozzles. Because the heat-resistant alloy material is difficult to machine and the shape of the parts is complex, it is impossible or difficult to manufacture by other methods. Therefore, it is necessary to find a new precise forming technology. Therefore, by referring to the wax-loss precision casting handed down from ancient times, through the improvement of materials and technology, the modern investment casting method is in ancient times. Important developments have been made on the basis of technology. Therefore, the development of aviation industry promotes the application of investment casting, and the continuous improvement and perfection of investment casting also create favorable conditions for further improving the performance of aviation industry.

The dimension accuracy of investment casting is high, generally up to CT4-8 (sand casting is CT10-13, die casting is CT5-7). Of course, due to the complex process of investment casting, there are many factors affecting the dimension accuracy of investment casting, such as shrinkage of mould material, deformation of investment mould, linear change of shell during heating and cooling, alloy. The shrinkage and the deformation of the castings during solidification process, so the dimensional accuracy of ordinary investment casting is higher, but its consistency still needs to be improved.

When pressing the melting die, the high surface finish of the cavity is used, so the surface finish of the melting die is also higher. In addition, the shell is made of a refractory coating made of a special high temperature binder and refractory material, which is coated on the melting die. The inner surface of the cavity directly contacted with the molten metal has a high smoothness. Therefore, the surface finish of investment castings is higher than that of conventional precision castings, generally up to Ra.3.2 um.