Optimization Parameters for Heat Bending Steel Fabrication
碩士 === 國立高雄應用科技大學 === 機械與精密工程研究所 === 103 === This study investigated the parameters in traditional heat bending fabrication processes and their effects on production speed and deformation. The Taguchi method was then used to optimize the parameters. The four factors influencing hot bending quality i...
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| Format: | Others |
| Language: | zh-TW |
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2015
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| Online Access: | http://ndltd.ncl.edu.tw/handle/28998388256332798612 |
| Summary: | 碩士 === 國立高雄應用科技大學 === 機械與精密工程研究所 === 103 === This study investigated the parameters in traditional heat bending fabrication processes and their effects on production speed and deformation. The Taguchi method was then used to optimize the parameters. The four factors influencing hot bending quality in this study were positive cooling. heating speed. nozzle size. and oxygen gauge pressure.
The L18 (21*73) orthogonal array Taguchi method was used to conduct 18 heat bending tests. The objective function in this study was the warping angle and the highest value was desired. The experimental data was entered into the larger the better function to obtain the S/N ratio for each test group. Then the optimization parameters were calculated from the S/N ratio. the resulting optimization experimental parameter combinations were A1 B2 C1 D1 E2 F3 G3 and H1 representative of the control elements: A1 positive cooling. B2 distance between water and fire 105mm. C1 heating speed 7mm/sec. D1 base material thickness 8mm. E2 distance between flame cone and material 30mm. F3 fire nozzle diameter 2.4mm. G3 acetylene gauge pressure 0.6 (kg/cm2). H1 oxygen gauge pressure 3.5(kg/cm2). Sorting value (RANK) and analysis of variance (ANOVA) were also conducted to understand the importance of each control factor. The results and were consistent with the response diagram and sorting values. confirming that the sorting values reflect the importance of the control factors. After optimization. The experiment was compared to a previous hot bending sample.
The changes in the bend angle in this experiment were used to analyze and select optimal parameters. Inconsistencies in the fabrication skill resulted in small errors in the collected data. Hot bending is only applicable in structural members with a small degree of curvature and it is mostly applied in combination with rolling for complex pieces with multiple bends in order to reduce production costs. This study can serve as a reference for industrial deformation and shaping of materials after welding.
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