Design of new giant magnetostrictive structures for double-nut ball screw pre-tightening

作者：Wang, Qingdong; Lin, Mingxing^*

来源：Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2017, 39(8): 3181-3188.

DOI：10.1007/s40430-017-0771-3

• Double-nut ball screw
• Pre-tightening
• Giant magnetostrictive structure

As a high-precision drive mechanism, double-nut ball screw is widely used in machining and manufacturing field. A pre-tightening structure added to the double-nut ball screw may reduce the axial clearance between nuts and screw, thus to increase transmission accuracy. The present commonly used pre-tightening structure cannot realize automatic regulation of pre-tightening force, so three new structures are designed in this article to achieve timely adjustment of pre-tightening force, namely the pre-tightening structure composed of hollow cylindrical GMM (Giant Magnetostrictive Material: Terfenol-D), the pre-tightening structure composed of three discrete Terfenol-D rods and the giant magnetostrictive pre-tightening structure with hinge-levers. After analyzing their structure characteristics and electromagnetic coupling relations, it is found that the giant magnetostrictive pre-tightening structure with hinge-levers is superior to the other two in performance. Electromagnetic coupling experiment result of this structure shows that it meets the pre-tightening requirements of double-nut ball screw, and can adjust the pre-tightening force by adjusting the electric current.

• 出版日期2017-8
• 单位山东大学