Terfenol-D棒磁致伸縮特性及可加工性能研究

Terfenol-D棒磁致伸縮特性及可加工性能研究Magnetostrictive property and machinability of Terfenol-D rod

Terfenol-D中磁致伸縮應(yīng)變與磁場(chǎng)強(qiáng)度關(guān)系的非線性,影響了磁致伸縮控制元件的精度和穩(wěn)定性.擬采用軸向開(kāi)槽的方式降低 Terfenol-D 棒由于渦流損耗產(chǎn)生的熱致變形.但是由于材料本身的物理特性,Terfenol-D 棒體加工難度很大.為對(duì) Terfenol-D 材料的加工性能進(jìn)行研究,選用了線切割和精密磨削兩種方式對(duì) Terfenol-D 棒進(jìn)行開(kāi)槽處理,結(jié)果表明線切割后加工表面雖然有一定的剝落凹坑產(chǎn)生,但對(duì)棒體的磁致伸縮特性影響較小.Terfenol-D 棒開(kāi)槽前后伸縮量測(cè)試結(jié)果表明在棒體表面開(kāi)4軸向槽可以降低材料的渦流損耗,提高輸出位移-磁場(chǎng)強(qiáng)度關(guān)系的線性度.

The non-linear relationship between the magnetostrictive strain and magnetic field intensity will affect the precision and stability of the actuator.This paper tries to reduce the eddy current loss in the Terfenol-D rod to improve linearity by machining radial grooves in the surface of the rod.The Terfenol-D rod was extremely difficulty to machine because of its brittleness.Wire-electrode cutting and precision grinding were preliminary chosen for the slotting,and the experimental results show that although the flake pits will be produced in the machining surface of wire-electrode cutting,the magnetostrictive property of Terfenol-D rod slotted was less af-fected comparing with precision grinding.The tests of the magnetostrictive strain in the Terfenol-D rod show that the eddy current loss was reduced and the linearity of output displacement was significantly improved by slotting 4 radial grooves in the rod surface.

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