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Stainless steel silica sol and precision casting process

Edit:Xiangyang Liqiang Machinery Co., Ltd.UpDate:2020-06-29

1. The silica sol processing technology belongs to the so-called investment precision casting. It is a forging technology with little or no drilling. It is an excellent production technology in the foundry industry and its application is very common. It is not only suitable for forging of various types and all kinds of aluminum alloys, but also produces castings with higher precision and process performance than other forging methods, and even other forging methods are difficult to cast, heat-resistant, and non-complex. Castings that are easy to produce and process can be cast by investment precision castings.

2. Investment precision castings are the basic development trend of wax forging in ancient times. As one of the four ancient civilizations, China is one of the earliest countries to apply this technology. As far back as hundreds of AD, our ancient laborers created this type of lost wax casting technology, which is used for forging and contains various details. Products such as clocks and containers with patterns and texts, such as the tomb of Zenghou Yi in the autumn and spring. The base of the tomb of Zenghouyi is composed of several dragons coiled around each other. They are connected end to end, overlapping left and right, resulting in a double-layer moiré pattern design with a hollow carved in the middle. This pattern design is difficult to produce with general forging techniques. Manufactured out, but using the lost wax forging process, it can use the characteristics of paraffin wax that has no compressive strength and is convenient for hand-carving. With general special tools, you can hand-carve the same paraffin wax as the Zenghouyi Tomb Zun plate. Materials of artwork, and then additional pouring system software, architectural coating, dewaxing, pouring, you can get the exquisite Zenghou Yi Tomb Plate

3. The concrete application of contemporary investment casting methods in industrial production was in the 1940s. At that time, the development trend of airline turbojet engines stipulated the production and manufacture of heat-resistant alloy parts with complicated specifications such as leaves, centrifugal impellers, nozzles, etc., with precise specifications and smooth surfaces. Because heat-resistant alloy raw materials are difficult to machine and manufacture, and the parts are so complicated that it is impossible or difficult to produce and manufacture in other ways, it is necessary to find a new high-precision forming and processing technology, so as to take advantage of the widespread loss of antiquity. Wax casting, after the improvement of raw materials and processing technology, the contemporary investment casting method has basically obtained the key development trend of the ancient processing technology. Therefore, the development trend of the aerospace industry has promoted the use of investment casting, and the continuous improvement and improvement of investment casting has also created a useful standard for the aerospace industry to further improve its characteristics. In our country, investment casting has just begun to be used in industrial production in the 1950s and 1960s. After that, this kind of excellent forging process has gained a great development trend, and it has been successively produced in airlines, cars, CNC lathes, ships, gas turbines, gas turbines, communication equipment, equipment, weapons, medical machinery and CNC blades. It is widely used in the production of ceramic art. It is also used to make the investment casting process clear. In short, it is to use fusible raw materials (such as wax or plastic) to make a fusible entity model (commonly known as investment or entity Model), apply several layers of specially made fire-resistant architectural paint on it, after drying and hard bottoming to produce an overall shell, then use steam or boiling water to melt the solid model from the shell, and then place the shell The sandbox is filled with dry sand modeling design around it, and finally the metal mold is put into the calcining furnace to undergo high-temperature firing (if a high-toughness mold is selected, the mold shell can be immediately removed from the mold without modeling design. Burning), after the metal mold or shell is burned, the molten metal material is poured into it to obtain the casting. The precision of investment casting specifications is relatively high, generally reaching CT4-6 (CT10^13 for sand mold casting and CT5~7 for aluminum die casting). Naturally, the entire process of investment casting is complicated, which endangers the precision of casting specifications. There are many factors, such as the deformation of the mold material to gather the investment mold, the linear transformation of the shell in the whole process of heating and cooling, the shrinkage rate of aluminum alloy and the deformation of the casting during the whole process of solidification, etc., so generally melt Although the precision of specifications of mold castings is high, its consistency still needs to be improved (the consistency of specifications of castings with medium and high temperature wax materials should be improved a lot). When suppressing the investment, choose a profiled plate with a high smoothness of the surface of the concave mold, so the surface of the investment is also relatively smooth. In addition, the shell is made of a unique heat-resistant adhesive and a fire-resistant insulation material. The fireproof architectural coating is made by hanging on the investment mold, and the inner surface of the concave mold that directly contacts the molten metal material is smooth. Therefore, the surface smoothness of investment castings is higher than that of ordinary iron castings, and generally reaches Ra.1.63.2um. The greater advantage of investment casting is because investment castings have high specification precision and surface smoothness. Therefore, it can reduce the machining and manufacturing work, only leaving a small amount of remaining machining at the specified higher position on the part, and even some castings only leave the grinding and polishing capacity, which can be applied without machining and manufacturing. It is not difficult to see that the choice of investment casting method can save a lot of mechanical equipment and comprehensive man-hours of production and processing, and greatly save metal materials. Another advantage of the investment casting method is that it can forge various aluminum alloy castings, and it is very capable of forging heat-resistant alloy castings. For example, the leaf of a jet-style diesel engine has a streamlined outer contour and an inner wall for refrigeration, which basically cannot be produced by mechanical processing. Manufacturing with investment casting processing technology can not only ensure mass production, ensure the consistency of castings, but also prevent the stress of residual knife marks after machining.

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