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How long does it take to learn the operation certificate of straight thread rolling machine

Three years.

According to the information of official website, after obtaining the straight thread rolling machine operation certificate, he has been engaged in rolling machine operation for more than 3 years and needs to learn again.

Straight thread rolling machine is a kind of steel processing machinery used in construction industry. The rapid rolling of the end of the steel bar leads to the cold hardening of the textured head.