Slag holes and shrinkage holes are very common defects in precision castings. The causes of these defects are multifaceted, mainly related to the smelting of molten steel, the cleanliness of recycled wax and the tree assembly process.1.1 Molten steel smelting: Although it only takes 20-30 minutes to

Cracks are the most destructive defects in precision castings. Cracks are not allowed in all precision casting acceptance standards. Most of the precision castings are hot cracks, and cold cracks are relatively rare.All cracks are caused by internal stress in the casting. When the internal stress of

Carbon is the first of the five elements of castings and has a great influence on the performance of castings. Steel and iron are distinguished by their carbon content. The surface decarburization layer of precision castings is generally not checked, but it is an important factor affecting the surfa