鎂合金線材感應加熱有限元素分析

鎂合金材料具輕量且高強度特性，另於生物體內具可降解特性，而可為醫材，然因鎂合金為六方最密堆積結構，加工成形性差，易硬化，不利冷加工，如能開發鎂合金線材溫間伸線製程，將可擴大其生醫應用市場。本研究以商用有線元素軟體DEFORM-2D，針對感應線圈對鎂合金線材加熱時，就線圈直徑大小、導程大小與圈數、施作頻率與功率大小、以及鎂合金線材線徑與其移動速率等因素影響加以探討。結果顯示鎂合金加熱溫度均集中在感應線圈所涵蓋的範圍上，且同一軸向截面上的溫度相當均勻，此外，感應線圈直徑大小對鎂合金線材感應加熱的結果分佈並無顯著的影響，但感應線圈的導程越小、圈數越多、施作頻率越高及功率越大，所得的溫度分佈越高。至於鎂合金線材直徑越大，移動速度越快，所得的溫度分佈亦越低。本研究結果應可供後續溫抽模組設計之參考。

關鍵字

鎂合金線材；感應加熱；有限元素法

並列摘要

Magnesium alloys are lightweight and high-strength. They are also biodegradable and can be used as medical materials. However, because magnesium alloys have hexagonal closed packed HCP structure, they have poor formability, are easy strain-hardened, and are not suitable for cold processing. If the warm drawing process could be developed for magnesium alloy wires, the biomedical application market might be easily expanded for them. In this research, the commercial finite element software DEFORM-2D is thus used to investigate the influence of the wire diameter, the lead and the number of induction heating coil, the frequency and the power used in the heating unit, and the diameter and moving speed of the magnesium alloy wire on the temperature distribution of the magnesium alloy wire. The results show that the heating temperature of the magnesium alloy is concentrated in the range covered by the induction coil, and the temperature on the same axial section is quite uniform. In addition, the diameter of the induction coil has no significant effect on the distribution of the induction heating results of the magnesium alloy wire. The smaller the lead of the induction coil, the more the number of turns, the higher the application frequency and the greater the power, the higher the temperature obtained. Furthermore, the larger the diameter of the magnesium alloy wire, the faster the moving speed, the lower the temperature obtained. The results of this research should be used as a reference for the design of subsequent warm drawing equipment.

並列關鍵字

Magnesium alloy wire ； induction heating ； finite element method

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