In recent years, micro-V-grooves have been designed on optical fiber docking, medical cell analysis and photovoltaic lamp substrate, which can produce new functions such as micro-fiber array positioning, micro-cell guidance and so on. But these high value-added substrates are mostly hard and brittle materials difficult to process. It depends on the low efficiency and high-cost method of chemical and chemical etching. In this study, it is proposed that the fine precision dressing with V-tip of
[u]fast 9'' grinding wheel[/u] is the key technology to ensure the degree of fineness.
In the research, the V-tip of the diamond grinding wheel is dressed by NC grinding and contact discharge technology, and the feasibility of micro-dressing is analyzed. Furthermore, the inspection and evaluation model of V-tip angle and tip arc radius is established to study the factors affecting the forming quality of V-tip of the diamond fast 9'' grinding wheel, and the dressing accuracy and efficiency are analyzed experimentally.
First of all, NC grinding technology was used to repair the V tip of a diamond grinding wheel and the machining experiment was carried out. The experimental results show that the radius of the V-tip of the SD600 diamond fast 9'' grinding wheel can be less than 20 microns, and the fine diamond particles on the V-tip can be sharpened, which can be used in micro-grooving. When machining monocrystalline silicon, the radius of the microgroove corner is 28.3-micron m, and its aspect ratio is 0.20. In addition, the shape of the V tip micro abrasive has a great influence on dressing efficiency and machining accuracy. Compared with # 180GC oilstone dressing, using # 600GC dressing can get better micro-abrasive edge appearance, and improve material removal rate about three times in micro-groove processing, but the dressing rate is reduced by 6-7 times. Thirdly, the V tip of the metal bonded diamond fast 9'' grinding wheel was repaired by contact discharge.
It is found that when the discharge voltage is 7V and the discharge frequency is 500HZ, a better forming angle and a smaller tip arc radius can be obtained; the dressing rate of contact discharge dressing is about 350 times that of # 600GC rubble dressing, and the dressing efficiency is about 59 times that of # 600GC rubble dressing. Finally, the V-shaped tip of the dressed fast 9'' grinding wheel is used to fabricate micron-scale groove arrays and pyramid spatial arrays of cemented carbide turning tool head, optical fiber butted quartz substrate, SiC ceramics and WC cemented carbide substrate. The experimental results have shown the application prospect, which provides a theoretical basis and basic parameters for the application of V-tip diamond fast 9'' grinding wheel in micro-machining.
