In the process of casting aluminum castings, defects such as internal porosity, shrinkage cavities, and pores are prone to occur. After these castings containing defects are machined, the surface dense layer components are removed and the internal organizational defects are exposed. For automotive aluminum castings with sealing requirements, such as cylinder blocks, cylinder heads, intake manifolds, brake valve bodies, etc., during the pressure sealing test, the existence of defective micropores will lead to the leakage of the sealing medium and cause a large amount of damage. Waste products, and these defects are often found only after pressure testing after machining, resulting in serious waves of working hours, raw materials and energy.

First, the difference between forging and casting:1. Words have different meanings:Forging: Use hammering and other methods to make a metal material in a plastic state into a workpiece with a certain shape and size, and change its physical properties.

The concept of green supply chain was first proposed by the Manufacturing Research Association of Michigan State University in 1996 in an "Environmentally Responsible Manufacturing (ERM)" study, also known as Environmentally Conscious Supply Chain (ECSC). Or Environmental Supply Chain (ESC) is a modern management model that comprehensively considers environmental impact and resource efficiency in the entire supply chain. It is based on green manufacturing theory and supply chain management technology, involving suppliers, production plants , sellers and users, the purpose is to make the product from material acquisition, processing, packaging, warehousing, transportation, use to the entire process of disposal, the impact on the environment (negative effect) is the smallest, and the resource efficiency is the highest.