In the process of processing precision castings, clean water should be used for cleaning and soaking. Before chemical degreasing and derusting, the workpiece should be cleaned first. In this way, the workpiece can be cleaned once, and the surface pores of the workpiece will be enriched by water, which is convenient for cleaning after chemical treatment.
For precision castings, if the oxide scale is removed by mechanical methods, such as polishing, rolling, grinding and sandblasting, some precision castings are treated by this method, and then after water cleaning, they can be directly blackened or other anti rust treatment.
There are many pores on the surface of precision castings. It is very difficult to remove the oil after being polluted. If the surface is not well treated, it will directly affect the whole antirust treatment, which will not achieve the expected purpose, including copper, iron, aluminum and its alloy castings.
Precision casting in the atmosphere will be directly because of its acid, oxygen and moisture moist air caused by corrosion or discoloration, this is known as rust and rust, it can make a very high strength metal surface into a very low strength compound.
It can adapt to high shear stress stirring and shorten the inter layer drying time of products. However, the inter layer drying time can be shortened to 1 h for such enhanced silica sol.
Silica Sol precision casting has strict requirements for shell making environment and wind speed. For castings with slender holes, the interlayer drying time needs to be appropriately prolonged. High polymer additives can help to reduce the defects of shell and casting.
In the process of production, the effect of additives will not be limited to help mold shell quickly establish wet strength, but also can effectively improve its investment casting quality. The surface quality of silica sol shell is good and its high temperature strength is high.
Silica Sol precision casting has a strong ability of high temperature deformation resistance, and its products require high precision technology. In practice and theory, we should strengthen the understanding of precision casting technology, constantly supplement its professional attempts and enrich its practical experience.
In the process of manufacturing, Silica Sol precision casting directly selects its less cutting and no cutting casting process. Silica Sol precision casting is a very advanced skill in casting profession, which is very suitable for casting various types and alloys.
The scale precision and appearance quality of the products produced by Silica Sol precision casting are much higher than those of other casting methods. The disordered castings which are difficult to cast by other casting methods, and the castings which are resistant to high temperature and are not easy to process can be directly produced by this method.
In the process of production, if we want the product shape is relatively simple, its scale is not too large, so the accuracy requirements on the scale are relatively high. In the process of application, we can choose the casting carbon steel as the first profile.
The advantage of steel mold used in Silica Sol precision casting is that the price of materials is relatively cheap, but the disadvantage of its products is that the mold is relatively bulky, so there are certain requirements for machining tools, which is more laborious for some manual operations.
The development of Silica Sol precision casting in China is relatively late. In the process of application, it is required that the precision is relatively strong. In practice and theory, the product needs to strengthen the understanding of precision casting technology, and constantly make up for professional knowledge in the process of application.
The size and surface quality of stainless steel precision casting is higher than other casting methods, and it is more complex than other casting methods. The products which are high temperature resistant and difficult to process in the process of use can be directly cast by investment casting.
Stainless steel precision casting in the production process is simply to effectively use its fusible materials, such as plastic or wax, effectively make a fusible model, effectively coat several layers of special refractory coating on it, and then form a whole shell after hardening or drying.
The mold shell is effectively melted out of the mold shell by hot water, and the mold shell is effectively placed in the sand box, and its surrounding is filled with dry sand molding. Later, the casting is put into the baking furnace and roasted at high temperature.
Stainless steel precision casting requires high dimensional accuracy, which can effectively reach ct46 in general. Due to the complex process of investment casting, there are many factors affecting the dimensional accuracy of the casting, such as the deformation of the investment mold, heating of the shell, shrinkage of the mold material etc..