The Detection Technology Research Of Magnetorheological Fluid Shear Force

Magnetorheological fluid is a kind of novel and highly characteristic liquid material.Because of its big shear force and kinetic stability, MRF and its related devices slowly become an important research direction. This paper explores the detection technology of the magnetorheological fluid’s shear force, in order to enhance the configuration of magnetorheological fluid and the experiment of optical parts’ ultra-smooth surface finishing.Firstly, the article has an overall introduction and analysis on the ring belt magnetorheological polishing machine. According to the idea of generating method and prospective center of sphere, a processing method of the arbitrary curvature radius of the optical parts is proposed. By changing the position of the intersection point of the spindle unit and pendulum shaft device in the space, it can achieve the process of the spherical optical parts of different curvature radius.Secondly, the article details the device’s building process of the detection of the magnetorheological fluid’s shear force. The detection device for the research is based on the magnetorheological finishing machine which is our laboratory’s independent research. In the design of magnetic circuit part, compared with the traditional, its biggest feature is the belts magnetic field device; In the design of the mechanical structure, there has the working body and the rack; by producing、mechanical assembly and control system connection, a device (shear mode) is built for the detection of the magnetorheological fluid shear stress on the ring belt magnetorheological polishing machine.Finally, after analyzing the traditional model and the physical properties of the magnetorheological fluid, the article deduces the formula of detection theory and does the detection experiments. The experiment is operated on the belts magnetorheological polishing machine. We calculate the magnetorheological fluid shear force size by detecting the work piece’s shear torque; through multiple sets of measurements, a relationship between τ and B and the approximate range of the magnetorheological fluid shear force (0～40kPa) are eventually obtained. The experimental data may verify the rationality and the stability of the detection device.