轉軸式門蓋常運用於液晶顯示器,需結合塑膠薄殼件、塑膠加強肋及卡扣結合的整合設計,其最為要的崁合部夾型卡扣即為卡扣的一種。本研究目的即探討與分析此種塑膠門蓋結合結構,尤其是夾型卡扣之力學行為,與夾持力分析。並結合商用有限元素分析軟體探討門蓋接合結構設計重要參數如材質、夾型卡扣厚度、夾型卡扣退出寬度、夾型卡扣長度對於夾持能力的影響,尋求使門蓋接合結構與門軸組合後夾持能力可達最佳的結構。在本研究個案,初步結果顯示即材質使用PC/ABS,夾型卡扣厚度4 mm,夾型卡扣長度9 mm,夾型卡扣退出寬度2.8 mm最佳,門蓋可達到58.26 N之夾持力,符合設計規範20 N,且其應力小於材料降伏強度。
The Finger-Grips for Door-Covers often used in the Liquid-Crystal display, must integrate the technology of “plastic injection shell parts with Reinforced Ribs” and “Snap-fit joints”. The purpose of this study is to investigate the holding force of this kind of joints structure. The Combination of commercial finite element analysis software is used to perform the stress and force analysis and the Taguchi Method is used to search the effects of design parameters like materials, thickness, width of Finger-Grips, length of Finger-Grips on the holding force of the whole joints. Preliminary results obtained from this case study show that the best choose of the design parameters for the holding force of 58.26 N are materials of PC/ABS, thickness of 3 mm, length of 9 mm,width of 2.8 mm .