科研之友
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摘要
In high value-added precision grinding,the key is the dressing and truing of diamond grinding wheel.However,how to control the micro protrusion status of diamond grits in micron scale has been depended on the scene experience.In this paper,the dressing method of diamond grinding wheel based on impulse discharge micro-removal was proposed.In order to realize intelligent control of micro grain protrusion in precision grinding,the relationship between characteristic impulse discharge parameters derived from impulse discharge current and voltage waveforms and micro-removal model of metal bond of grinding wheel was investigated.First,the on-line collected impulse discharge waveforms were characterized into impulse discharge parameters (impulse peak current Ie and impulse discharge duration τe).Then,according to the impulse discharge parameters,removal volume of a single impulse discharge crater was calculated to predict accumulated removal volume of metal bond.Finally,the measured metal bond removal volume and predicted metal bond removal volume by impulse discharge parameters was compared.The experimental results show that the impulse discharge parameters may be used to effectively predict the micro-removal of metal bond,which can realize the intelligent dressing of diamond grinding wheel.The smallest prediction error was about 8%.After dry electro-contact discharge (ECD) dressing,the grain protrusion height on wheel surface was about 130 μm,which was about 37% of theoretical grain size.Against the mechanical dressing,the diamond grinding wheel after dry ECD dressing can obtain better surface quality.It can realize mirror dry grinding machining of die steel.The ground surface roughness Ra reached to 0.022 μm.
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