Abstract
With the development of advanced medical treatment, the demand for fine tubes in the medical field is now very high. The technology employed must enable the production of tubes with various features, such as the following four; small size, high quality, high functionality, and low processing cost. In the soft metal mandrel drawing, that is, drawing with a flexible mandrel, is a good method of fine tubes with high drawability; however, this is not appropriate for the fabrication of long tubes because of the difficulty in the complete removal of the mandrel from the tube. Then We proposed new drawing methods using fluid such as water for mandrel. Fluid mandrel drawing with water is the most appropriate for fabricating tube products, because water is more easily removed from the tube surface than oil.
