Research On The Lateral Vibration Control Of High-speed Rotating Disk Slice Cutter

The rotating disc is one kind of basic mechanical parts in the industry,and is applied widely in the rotating machines,such as the turbine,the computer hard disk and disc cutter etc.. The high-speed rotating disk slice cutter is used widely to process semiconductor material,compound material,lumber and stone material。But in the during of processing the materials,the cutter thickness and vibration make a lot of loss of material, so the utilization rate of material is reduced。The rarity of material and the processing quality require the thinner cutter and the higher rotating speed。The thinner cutter can reduce the loss of material in cutting blade, and the higher rotating speed can improve the cutting quality. Along with the cutter thickness reducing and the rotating speed increasing,the cutting force can cause the cutter lateral vibration, which will increase the cutting blade axial displacement. The increasing of axial displacement will make contrarily the cutting force increase, cutting temperature increase, the cutter life reduce, the cutting quality fall, and the utilization rate of material descend. So it is very important for improving processing surface quality and reducing material loss to reduce the lateral vibration of high-speed rotating disk slice cutter and increase the rotating speed of disk slice cutter. In shortage of the resources material and the environmental protection situation, it becomes more and more important to control strictly processing of raw material, reduce material loss and enhance the utilization rate of material. The following research is carried in order to reduce lateral vibration of high-speed rotating disk slice cutter.1,According to the industry application situation of rotating disc, research significance of this paper is addressed. This paper has analyzed the work characteristic, the application and the domestic and foreign research status of the high-speed rotating disc slice cutter and the progress situation of lateral vibration control. It has proposed to apply the fluid presses membrane and extrusion membrane to solve the lateral vibration control of the high-speed rotating disc slice cutter. And the research contents are confirmed.2,According to the actual work condition of the rotating disc slice cutter,based on the board shell finite element theory, this paper has analyzed unit division ways of the disc slice cutter, and proposed the square grid division method. By comparing computation quantity and astringency of square quadrangle and equidistance quadrangle and equi-acreage quadrangle, the square grid unit division method has been selected to divide the slice cutter. And the unit model function has been also established. Then, from the rotor kinetic theory and the Lagrange equation, the dynamic equation has been established of the high-speed rotating disc slice cutter considering the effect of cutter rotating, gyroscopic effect, bending strain, acentric-force and disturbance external force on the cutter lateral vibration. Finally, according to the dynamic equation,the distortion of the disc slice cutter under static-force,natural frequency, vibration mode and displacement responds of the cutter system under the harmonic excitation have been analyzed. It lays the foundation for studying the lateral vibration control of rotating disc slice cutter.3,According to the dynamic equation, this paper has deeply analyzed static and dynamic characteristic of the rotating disc slice cutter system. Firstly, the static characteristic has been analyzed by computing separately the distortion of the disc slice cutting under gravity distortion, load of the single side and load of two sides. Then this paper has studied the effect of the thickness of the cutter,the change of outer diameter and inside diameter on the system natural frequency and the critical rotation speeds. And the various natural frequency and vibration type of the system have been calculated. It lays the foundation for studying the lateral vibration control of rotating disc slice cutter.4,Base on static and dynamic characteristic, according to hydrodynamic lubrication theory,this paper has proposed to design a lateral vibration controller to suppress the lateral vibration of the disc slice cutter. The controller can control lateral vibration of the cutter with pressure membrane formed by cutter high speed rotating and lateral vibrating. And the control panel structure of lateral vibration controller has been designed. Then the equations of hydrodynamic lubrication in two kinds of controllers with two different control panel structures, the steppe type and the plane wedge type have been established. According to the equations of hydrodynamic lubrication, the fluid pressure in the controllers has been separately calculated. And then base on pressure equation the stiffness and damping coefficient of hydro-membrane can be got. It lays the foundation for controlling the lateral vibration of the rotating disc slice cutter by using the hydrodynamic pressure membrane.5,Base on foregoing analysis to dynamic characteristic of the disc slice cutter, and the rigidity and damping of the hydrodynamic pressure membrane calculated in the controller, the dynamics equations of high-speed rotating disc slice cutter have been established. Then this paper has calculated and analyzed the suppression effect on cutter lateral vibration by separately using two kinds of controllers with the steppe type and the plane wedge type under the 1N force with 100Hz frequency on edge of disc slice cutter. Ultimately the steppe type controller has been selected, and the structure parameter of the steppe type controller has been analyzed. Finally, this paper has studied the effect of cutter position and quantity of controller and installed angle between controllers on the cutter lateral vibration. The result indicated two controllers are better than one, the effect of more than two controllers is not obvious, and the effect of reducing vibration with installs angle 900 between two controllers is better than that of the installs angle 1800.6,From the theoretical analysis, the static and dynamic characteristic have been surveyed of the disc slice cutter system with the experimentation equipments specially designed and manufactured. And the measurement and the theoretical analysis results have been compared to verify the theory. When carrying on the static survey, the disc cutter is nipped in middle and placed on the level, the same weights are symmetrically played on the edge of disc slice cutter. Then the distortion of the disc slice cutter is measured by using industry CCD under different load. When carrying on dynamic characteristic survey, the vibration displacement of the cutter is measured by using the data acquisition system, the electricity turbulent flow position transducer, and electrical machinery whose speed can been adjusted between 0~2250r/min. The lateral vibration of the cutter is measured when the controller of the steppe type and that of the plane wedge type are separately used. The result indicates the suppression effect of the steppe type controller is better than that of the plane wedge type. More over, the controller structure of steppe type has been also optimized through the experiment. Base on the optimization, another two experiments, which the install angle is 900 between two steppe type controllers and no force is putted on the cutter are carried, are done. All the results indicate that the hydrodynamic lubrication controller with steppe type structure can effectively suppress the cutter lateral vibration.Finally, this paper has addressed the innovation achievement and research findings, and pointed out the deficiency.