1: The ring punch fits tightly on the inner wall of the melting cup with good sealing performance and high product qualification rate.
2: It can greatly reduce the vacuum value.
3: The contact area between the steel ring and the inner wall of the melting cup is small, and the hardness of the copper ring is low, which can play a good role in protecting the melting cup and extending the service life of the melting cup.
4: The steel ring replacement is convenient and fast, which greatly reduces the replacement time and improves the production efficiency.
5: High cost performance and significant cost reduction.