APPARATUS FOR MANUFACTURING METAL PIPE CAPABLE OF REDUCING THE DIAMETER OF THE METAL PIPE USING CORRECTION ROLL AND, APPARATUS FOR MANUFACTURING METAL RESIN COMPOSITE PIPE HAVING THE SAME

摘要

The present invention has the advantage of being able to reduce production costs of an apparatus by being able to reduce a length of a manufacturing line and improve a physical property (strength) of a metal pipe using a prior tool which has been used for metal pipe correction, and not only for correction but also for diameter reduction and withdrawal of the metal pipe; being able to make a product having a same specification as a prior standard by coating a resin on an outer surface of the metal pipe manufactured by the same apparatus; and being able to prevent a welding fault even though there is a wave phenomenon in a circular-formed metal pipe by adjusting a height of a roll before and after welding.