縫紉機主結構設計流程優化之研究

A Study of Optimal Design Process for the Sewing Machine Structure

劉雪華(Hsueh-Hua Liu)

指導教授 ： 陳維隆

朝陽科技大學/設計學院/數位化產品設計產業研發碩士專班/碩士(2010年)

摘要

縫紉機主結構主要功能是固定各零件，在縫紉機運轉承受外力時，結構的剛性需使各零件保持相對位置，同時保持縫紉模樣的穩定，所以對於縫紉失效模式與模樣穩定性有關鍵影響。但結構的剛性不能無限增加，因剛性通常與結構重量成正比；結構越重，材料成本就越高，必須在足夠的剛性下，設計出最輕的主結構。而消費者使用縫紉機車縫時，除了操作便利、模樣多變外，最直接的感覺就是噪音與振動。所以在輕量化的同時，也需分析主結構的自然頻率以防止共振的發生。
本研究本研究將以有限元素法的套裝軟體，模擬二大類型的縫紉機主結構—單一主結構體與主結構組(上臂+底盤+底板) ，在負載下的應力應變，並配合田口實驗法及結構最佳化設計法減輕結構重量，再將減重修改後的模型，作自然頻率模態分析，檢驗是否發生共振，並作為修改結構剛性的條件。最終目的是在和舊機型相近或更佳的剛性下，減輕單一主結構
重量15%。再以此流程模擬分析新設計的主結構組，同樣作減重優化。最後在累積相當的經驗與資料後，將此優化流程應用於創新設計的主結構上，以減少創新設計的重複修正設計次數，並增加企業的新產品與利潤。

關鍵字

電腦輔助工程分析 ； 縫紉機主結構優化

並列摘要

The Main function of the sewing machine main structure is to fix all parts and take the external force when sewing machine is running. The rigidity of the structure is required to maintain the relative position of parts, while maintaining the stability of sewing pattern. However, the rigidity is usually proportional to the weight of structure; the more rigid structure is, the higher cost of materials is. The target of study is to design the lightest main structure with enough rigidity. When consumers are using the sewing machine, they concern not only the convenience and various patterns, but also the noise and vibration. Therefore, it is necessary to analyze the natural frequency of the main structure to prevent the occurrence of resonance when reduced the weight of the main structure.

This study will use the finite element method to simulate the two major types of sewing Machine main structure - a single structure and the main structure of assembly (arm + bed + bas), stress and strain under load, and with the Taguchi method and optimum design of structures method to reduce structural weight, then weight the modified model for the natural frequency of mode analysis, testing whether the occurrence of resonance, and modify the structure as rigid conditions. Most of the ultimate goal, and the old model is similar to or better rigidity and alleviate the main structure of a single weight of 15%. Process simulation using this new design of the main structure of groups, the same as weight optimization. Finally, accumulated considerable experience and information, this optimization process applied on the innovative design of main structure to reduce duplication of amendments designed innovative design all of the new products and increase business and profits.

並列關鍵字

Computer Aided Engineering ； optimal sewing machine structure

參考文獻

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