Precision casting is the general term for the process of obtaining precise dimensional castings. The production process of precision casting is worth our attention. Today, Xinhang editor will analyze the process characteristics of stainless steel precision casting with you.
1. The structure of the pouring system should be simple and the cross-sectional size should be larger than that of cast iron. Generally, dry casting or hot casting is used; Due to the poor flowability of molten steel, in order to prevent cold insulation and insufficient pouring of cast steel parts, the wall thickness of cast steel parts cannot be less than 8mm. Appropriately increasing the pouring temperature can improve the flowability of the molten steel, as high pouring temperature leads to high overheating of the steel and prolonged liquid retention time. However, excessive pouring temperature can cause defects such as hot cracking, coarse grain size, sand adhesion, and porosity. Therefore, the pouring temperature of large and thick walled castings is generally about 100 ℃ higher than their melting point; Thin walled, small, and complex shaped castings are poured at a temperature of approximately 150 ℃ above the melting point of steel.
2. Because stainless steel has a much larger shrinkage rate than cast iron in precision casting, in order to prevent casting defects such as shrinkage and porosity, measures such as cold iron, riser, and subsidies are mostly used in the casting process to achieve sequential solidification. In addition, to prevent shrinkage, porosity, cracks, and porosity defects in stainless steel castings, it is necessary to avoid sharp and right angled structures, uniform wall thickness, add coke to the core, add sawdust to the molding sand, and use oil sand cores and hollow cores to improve the permeability and setback of the core or sand mold.
Xinhang Precision Casting Equipment Co., Ltd. is a professional manufacturer of precision casting equipment, specializing in the production and sales of precision casting equipment for nearly 20 years. If you want to learn more about the production process and precautions of precision casting, please contact Xinhang Precision Casting Equipment Co., Ltd. We will carefully explain and answer your questions.