Processing Research On Fine Grain Diamond Grinding Wheel For Abrasives Uniform Distribution Based On Magnetic Field Controlling

In recent years, precision and ultra-precision machining has become animportant method for lens mold process. How to process the nano-scale surfaceand shape accuracy of the lens mold has become a subject of extensive researchfor researchers. In the manufacturing technology of small aspherical lens andoptical mold manufactured by hard and brittle materials, the most effectivemethod to obtain high precision and high surface quality mold is using smalldiameter fine powder grinding wheel for mirror grinding.At present, the common problem exists in the traditional abrasive grindingwheel is the distribution of the grains in abrasive layer uneven, and this willresult in the surface roughness uneven when grinding. To solve this problem, amagnetic field is applied in the process of moulding a grinding wheel. Becauseof the effect of the magnetic field, the grains distribution can be uniform. Usingthis kind of grinding wheel can get a smaller surface roughness than traditionalabrasive grinding wheel, that’s because the grains uniform distribution makesthe number of grains take part in grinding in the same time increased, and thatwill be good for improving the grinding efficiency.This project is supported by the Program for New Century Excellent Talentsin University "nano-grinding technology research for ultra-precision optical lensmold". In view of the current challenges in grinding lens mold, this paperconducts the following studies:(1) The manufacturing technology principles, present research situation anddevelopment trend of fine grain diamond grinding wheel based on magnetic fieldcontrolling manufacturing technology are reviewed, the background, content,purpose and meanings of the research are described.(2) For features of the fine grain diamond grinding wheel based onmagnetic field controlling, the manufacturing equipment including the motorselection, mold design, the magnets selection and other ancillary structures aredesigned and manufactured.(3) A series of ratio experiments are taken for the fine grain diamondgrinding wheel based on magnetic field controlling, the distribution of grains areobserved, and several groups of good parameters are obtained. Through theexperiment, it can be concluded that, magnetic particles showed random distribution in weak magnetic field, a uniform distribution of magnetic particlescan be gotten when the magnetic field increased to a certain intensity, and thecluster chain will be gotten in strong magnetic field.(4) The molding process of fine grain diamond grinding wheel based onmagnetic field controlling is designed and taken, and groups of wheels are madein different ratio, magnetic field and speed of motor. The dressing experimentsare taken for the wheels.(5) Grinding experiments are carried out for the cemented carbide usingthese wheels, and experimental parameters and results are compared withcommon wheels, meanwhile, the surface quality after grinding is analyzed.