How to determine the quality of gray cast iron?
Release time：
2023-02-21
The quality of gray iron castings can be seen not only from the appearance of the castings, but also from the shape and color of iron cutting during machining. The hardness of the castings can also be seen through machining. After machining, it can be seen by observing the smoothness of the machined surface, whether there are pores, sand holes, shrinkage porosity, sand inclusion, etc.
The quality of gray iron castings can be seen not only from the appearance of the castings, but also from the shape and color of iron cutting during machining. The hardness of the castings can also be seen through machining. After machining, it can be seen by observing the smoothness of the machined surface, whether there are pores, sand holes, shrinkage porosity, sand inclusion, etc.
1. Appearance quality inspection Generally, the foundry can inspect the quality of gray iron castings through surface observation. This includes the use of auxiliary tools to detect the size and weight deviation of castings. For some common appearance casting defects, such as pores, cracks, shrinkage, deformation, etc., visual inspection can be carried out.
2. Internal quality inspection The internal quality of gray iron castings mainly includes mechanical properties, chemical composition, internal defects of castings, etc. The inspection of mechanical properties requires the casting manufacturer to test the tensile strength, elongation and strength of the casting; According to the analysis of chemical composition, the composition ratio of the five elements of carbon, phosphorus, manganese, silicon and sulfur in the casting is mainly detected; For the internal defects of castings, nondestructive testing is mainly used. After the specific location of the internal defects of castings is determined by ultrasonic and ray, the repair of castings can be carried out.
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