Semi-active turning flutter magneto-rheological damping device based on extrusion operation mode

Abstract

The invention relates to a semi-active turning flutter magneto-rheological damping device based on an extrusion operation mode. The damping device comprises a fixed magnetic pole component and a vibrated magnetic pole component, wherein an end cover in the fixed magnetic pole component is fixedly connected with a box body; two fixed magnetic pole plates are connected with the end cover and a cylindrical hole in the inner side of the box body in an interference fit manner respectively; a dabber in the vibrated magnetic pole component is matched and connected with a homemade lathe tool through a Morse's cone; the space between the end cover and the box body is filled with a magnetorheological fluid; two disk-shaped iron cores are placed in the space between the end cover and the box body, and are connected with the dabber in an interference fit manner; and magnet exciting coils wind cylindrical skeletons of the disk-shaped iron cores. By the adoption of the characteristics that the magnetorheological fluid is fast in response under an external magnetic field, and different damping forces can be provided in transformation from liquid to solid, and on-line continuous real-time control of power parameters (damping, stiffness and the like) of a lathe saddle system is realized; and the damping device is mounted on a lathe sliding box, so that the adjustment is convenient, and flutter in cylindrical turning can be effectively inhibited.

Description

technical field [0001] The invention relates to a vibration damping device in the turning process, in particular to a semi-active turning chatter magneto-rheological vibration damping device based on an extrusion working mode. Background technique [0002] Although metal cutting technology has made many advances, machining accuracy and machining efficiency are still trapped by the unstable phenomenon of the cutting process, which is commonly referred to as chatter. In order to ensure the necessary processing quality of parts, sometimes the amount of cutting has to be reduced, so that the cutting performance of machine tools and cutting tools cannot be fully utilized, which seriously limits the improvement of cutting efficiency and processing quality of parts. At present, with the increasing popularity of high-efficiency and high-precision equipment and technologies such as CNC machine tools, machining centers and high-speed cutting, the development of cutting chatter control...

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Problems solved by technology

Zhejiang University has developed a magnetorheological intelligent boring bar, which changes the dynamic characteristics of the entire boring bar by changing the magnetic field strength in the boring bar. After testing, the device can suppress boring chatter to a certain extent. The working of the device The principle belongs to the shear-extrusion mixing mode, the structure is more complicated, and it is not easy to adjust during the processing

Li Mingzhang from Harbin Institute of Technology and others added metal foam to the conventional magnetorheological fluid, and developed a metal foam damper with a cylindrical structure. This kind of magnetic fluid-metal foam damper is suitable for high and low frequency vibration control, but Its disadvantage is that the controllable damping force it can provide is smaller than that of conventional magneto-rheological dampers. It is generally used for vibration control of motor bases. Whether it can be used for cutting chatter control needs further study

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