Design and Manufacturing of Grooved Heat-Pipes

• Main Authors: Chang-Hsing Lee, 李長興
• Other Authors: Chin-Shu Wang
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/90453771693040135976

碩士 === 國立臺北科技大學 === 機電整合研究所 === 91 === The research reveal the effects of the stress distributions by different parameters, die semi-angle（α）, plug semi-angle（β）, friction coefficient（μ）, and wall thickness reduction ratio (RD)t , and etc. in the manufacturing process of tube drawing with floating plug. We derive the drawing force equations by “Slab method” and verify by finite element package ANSYS to compute the plastic drawing processing. Develop the model of the smooth tube drawing and design the optimum parameters for groove floating plug. FEM reveal the floating plug motion and the effects of locking for model by simulation. The critical floating plug friction coefficient value is 0.15. When the friction coefficient is below critical value, the floating plug is locked in die but upper critical value, it escapes from die. We use μ=0.1 in our theoretical and FEM computation process. The theoretical solution and FEM results have nearly 1.6~3.5% relative stress error, just resulted from the different elastic-plastic and rigid-plastic inlet condition’s assumption. Both above results compared with experimental data, we find below 4.9~11.5% drawing force relative error which is below the current research of 15% Results reveal the theoretical prediction can be ultilized in the drawing tube engineering.