What are the factors that affect the quality of cast iron castings
Cast iron is a commonly used component in mechanical manufacturing, widely used in fields such as automobiles, machinery, electricity, shipbuilding, metallurgy, and construction. The quality of cast iron castings directly affects the performance and service life of products, therefore, it is necessary to understand the factors that affect the quality of cast iron castings.
1. Quality of raw materials
The raw material of cast iron castings is molten iron, and its quality directly affects the performance of cast iron castings. If the molten iron contains a large amount of impurities, oxides, inclusions, etc., it will lead to a decrease in the strength, toughness, plasticity and other properties of the cast iron, and even defects.
2. Casting process
The casting process is one of the key factors affecting the quality of cast iron castings. The casting process includes multiple stages such as pouring, cooling, solidification, etc. Any problem in any of these stages may lead to a decrease in the quality of cast iron castings. For example, during the pouring process, if the temperature of the molten iron is not high enough, the flow rate is not fast enough, and the pouring position is not appropriate, it can lead to defects, pores, and other defects on the surface of the cast iron.
3. Melting method
The melting method of molten iron in casting can also affect the quality of cast iron castings. At present, the commonly used smelting methods include blast furnace smelting, electric furnace smelting, etc. Among them, the casting molten iron quality of electric furnace smelting is relatively good.
4. Mold quality
The quality of the mold for iron castings also affects its quality. The material, manufacturing process, and service life of the mold will all affect the surface smoothness, dimensional accuracy, and other aspects of the cast iron parts.
5. Post treatment process
After the completion of casting, cast iron parts also need to undergo post-treatment, such as deburring, polishing, heat treatment, etc. If the post-treatment process is improper, it can also lead to a decrease in the quality of cast iron castings.
