This research related to the development of ultrasmall inner spiral ribbed copper tubes (ISRCTs) which have high quality and efficiency in transferring heat. The deformation behaviour of the ISRCT was studied. Three-dimensional finite element models were constructed for the various process parameters: the change of the cross-section profiles of the ribbed contours and the spiral angle of the ribbed area of the ISRCT, for twelve multi-pass drawings through the die using the tube sinking method. The effect of the ribbed spiral angle and the ribbed cross-sectional profile was also studied. Modelling and simulation techniques were performed using commercial Abaqus software to learn whether the surface profiles of the ISRCT increased or reduced with tube sinking using the finite element method (FEM). Results of the multi-pass drawing analysis were summarised and compared to the experimental findings. The FEM simulation approach was used to analyse the changes of ten parameters: von Mises stress, wall thickness, ribbed base width, ribbed tip width, ribbed base gap, ribbed tip gap, ribbed height, ribbed pitch, axial displacement and ribbed spiral angle. This procedure can be used to improve product quality and to study the effect of the various parameters. The results will be very valuable for researchers and well engineers for future design of ultra-small ISRCT to improve the quality and efficiency of heat transfer.
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.
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