What Are The Difficulties in Processing Castings?

The main reasons why cast products are widely used in multiple application fields include their ability to manufacture complex shapes, wide material adaptability, low production costs, suitability for mass production, and the ability to form large-sized parts. However, castings are different from profile processing products. During the processing, special attention needs to be paid to the shrinkage ratio of the castings, the quality of the blanks, and the precision requirements. So, what are the difficulties that need to be noted in the actual operation process?

Sand Sticking, Cold Shuts and Pores:

During the casting process, sand sticking, cold shuts, and pores are common defects. Sand sticking occurs because the mold sand adheres to the surface of the cast piece, resulting in a rough surface of the cast piece; cold shuts are caused by the metal liquid not fully merging before solidification, forming incompletely fused gaps; pores are formed because gases in the metal liquid are not promptly expelled during solidification, resulting in holes.

 

Low Process Level and Difficult Quality Control:

The process level of the foundry is low, which easily leads to poor quality of the castings, large machining allowances, difficulty in controlling deformation issues, and excessive consumption of raw materials. Moreover, the immature process can also cause defects such as cracks, entrapped air, and inclusions in the castings, reducing the yield and qualification rate of the castings.

 

Outdated Equipment and Backward Technology:

Many foundry enterprises have outdated equipment and backward technology, lacking effective environmental protection measures, which leads to low production efficiency and unstable product quality.