MANDREL SEAL PART

摘要

A mandrel seal part is provided to prevent a tube from being damaged during expansion of the tube by forming the tube in a cylindrical elastic member and covering the tube using an elastic covering material. A mandrel seal part(1) comprises a mandrel body, a cylindrical elastic member(3) and an elastic covering material(4) covering an outer circumference of the cylindrical elastic member. The mandrel seal part expands a tube member from the inside of the tube member by sealing ultra high pressure liquid, which is provided from a body of a liquid pressure tube expander through a tube expansion tool part in a state in which the mandrel seal part is inserted into the tube member. The mandrel body is connected to the tube expansion tool part and receives the ultra high pressure liquid. The cylindrical elastic member is mounted on an outer circumference of the mandrel body.