| Form-grinding has many characteristics to fulfill precision process, such as high process efficiency, good work-piece uniformity, and low requirement for operating staffs'technical level. So it is widely used in precision machining for curved face. The metallic bond diamond wheel can process hard brittle material of complex surface, it can be high efficiency, precision and large-tonnage scale. The shape precision of form-grinding wheel can directly affect process quality of work-piece surface. So it has great applied value to research metallic bond diamond wheel.Electric spark dressing can achieve high dressing precision, and it is very convenient to operate, also has zero dressing force. The trimming and shaping process are managed side-by-side, so it is an ideal method to dress metallic bond form-grinding wheel of ultra-hard abrasive. Now we can obtain precision truing for random profile wheel by using numerable control operating platform.Firstly, several hardware equipments were developed to fulfil different profile diamond form-grinding wheel, such as control circuit board, keyboard input circuit board and driving amplifier circuit board.Secondly, NC program using assembly language was developed to dress random line-arc assembled profile wheel, it include keyboard-scanning program, curve interpolated program and driving program for magnetic step motor.Lastly, the influence for dressing efficiency by using different dressing parameter was developed with our NC electric spark form-grinding dressing equipment, and the best parameter for dress cast iron bonded diamond wheel in high efficiency was obtained. The grinding experiment for hark brittle material by dressed wheel was taken out, then the profile precision can be deduced by measure the roundness error of the work-piece circle-arc groove after grinding. The result of this experiment shows that the electric spark dressing has high figure precision, it can fulfil the demands of diamond form-grinding wheel dressing.
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