Fabrication of Small Size Inner Spiral Ribbed Copper Tube Using Tube Sinking Method

Abstract

This research related to the development of ultra-small inner spiral ribbed copper tubes (ISRCT) which has the quality and the efficiency in transferring the high heat. So the demand of using ultra-small tubes in electrical appliances today is very high and will be greater in the future. The technology required must be the technology that can produce ultra-small ISRCT with various distinguishing features such as small size, high quality, high functionality and low cost of productions in order to fulfill the increasing demand. The conventional production method was suitable for large tubes which high draw ability, but unsuitable for the fabrication of long ultra-small tubes because it is difficult to manufacture the devices used as tools such as an ultra-small spiral ribbed mandrel and a floating plug. This research has proposed tube sinking drawing method and presented a comparison of seven parameters, including the drawing stress, wall thickness ratio, ribbed base width ratio, ribbed tip width ratio, ribbed height ratio, ribbed pitch ratio, and ribbed spiral angle ratio. The experiment was found that the tube sinking was possible for making the ultra-small ISRCT. The results showed the sum of a reduction in the right size in the case of ultra-small ISRCT. The most appropriate must not exceed 68.81% and will be reduced after draw formed to the 8th.