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International Standard Serial Number:
ISSN 1001-4551
Sponsor:
Zhejiang University;
Zhejiang Machinery and Electrical Group
Edited by:
Editorial of Journal of Mechanical & Electrical Engineering
Chief Editor:
ZHAO Qun
Vice Chief Editor:
TANG ren-zhong,
LUO Xiang-yang
Tel:
86-571-87041360,87239525
Fax:
86-571-87239571
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No.9 Gaoguannong,Daxue Road,Hangzhou,China
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310009
E-mail:
meem_contribute@163.com
Abstract: Aiming at the problems of sudden damping change and low load of aerostatic guide platform in precision machine tools, a large-load magneto fluid two-dimensional guideway platform was proposed based on magnetic fluid bearings. Firstly, the key problems of guideway platform based on magnetic fluid were studied, including air loss and magnetic fluid wake. Secondly, a double U-shaped guideway platform structure was designed by using magnetic fluid pressure bearings, and a liquid storage layer was formed on the rotor by placing the top, bottom and side bearing pads closely together. The guideway platform with upper and lower magnetization configuration had six bearing pads, and each bearing pad was composed of a plurality of small magnets. Then, the load capacity, stiffness and eddy current damping were numerically simulated. Finally, kerosene-based magnetic fluid, aluminum material and ferritic stainless steel were selected to prepare the platform prototype, and the performance was tested,and the validity of the guideway platform was verified. The results show that the flatness of the platform is ±7μm, which has high repeatability and is obviously superior to the existing precision motion system based on magnetic fluid bearings. Under the same stroke and size, compared with the pneumatic platform, the maximum effective load is 140 N, which is increased by 40%. The damping is relatively constant and predictable between 2 N·s/m and 4 N·s/m, which avoids the sudden change of damping of the pneumatic platform and is beneficial to realize high-precision positioning.
Key words: precision machining; magnetic fluid guideway platform; aerostatic guideway platform; sudden damping change; large load; planeness; repeatability
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