With the technology development, some old machines need to be upgraded, some of them need to be disused. The shot peening machine has kept working for over 10 years. It is too old to work, because it has experienced the busiest period, the parts are broken again and again. Additionally it lead to air pollution. When it work, the dust is full of plant. Recently, the new machine has been installed and start to work. The out-looking of products will be improved.
