The technology of superabrasive grinding has been developed in order to achieve high-quality finish in extremely hard and brittle materials.Thereafter, truing and dressing technology on super abrasive grinding wheel is one of the most important subjects on precise machining field at present.In this paper, mist-jetting electrical discharge technology was applied to dressing metal-bonded superabrasive wheels.And a systematical study on the mechanism of selective removal of the bond was proposed.Experiments on dressing bronze bonded diamond grind wheels were carried out on a die-sinking electrical discharge machine.The diamond wheel topographies before and after electrical discharge dressing were observed by VH-800 3D digital microscope.The wheel profiles before and after dressing were observed.The results of electrical discharge dressing under different electrical parameters were compared.Experimental results indicate that the favorable surface topography can be obtained under suitable processing parameters and mist-jetting electrical discharge dressing(MEDD) is feasible for metal-bonded diamond grinding wheel.
An application for achieving on-machine truing/dressing and monitoring of diamond wheel is dealt with in dry grinding.A dry electrical discharge(ED)assisted truing and dressing method is adopted in preparation of diamond grinding wheels.Effective and precise troing/dressing of a diamond wheel is carried out on a CNC curve grinding machine by utilizing an ED assisted diamond dresser.The dressed wheel is monitored online by a CCD vision system.It detects the topography changes of a wheel surface.The wear condition is evaluated by analyzing the edge deviation of a wheel image.The benefits of the proposed methods are confirmed by the grinding experiments.The designed truing/dressing device has high material removal rate,low dresser wear,and hence guarantees a desired wheel surface.Real-time monitoring of the wheel profile facilitates determining the optimum dressing amount,dressing interval,and the compensation error.
