The material itself is hard. According to the relevant data, it is found that the copper strip produced by up-drawing method is hard or contains too many hard impurity particles, which leads to high calorific value and local high temperature oxidation when cutting. Therefore, the content and distribution of impurity elements in copper strip can be analyzed in time to make the distribution of impurity elements in the whole copper strip as uniform as possible. Prevent the copper strip from hardening. Increase cutting cooling and lubrication.