The invention discloses an in-gas
discharge dressing and truing method for a large-particle
diamond grinding wheel. The method includes: fixing the
diamond grinding wheel on a
grinding wheel shaft, and fixing a conducting
electrode on the horizontal plane; connecting the
diamond grinding wheel, the
electrode, a
graphite brush, a power source and a wire to form a
discharge circuit; connecting a positive pole of the power source to the
grinding wheel, and connecting a negative pole of the power source to the
electrode. When rotating, the
diamond grinding wheel linearly reciprocates on the surface of the electrode;
metal bond is removed by pulse sparks generated between the electrode and the
metal bond of the
grinding wheel, so that diamond
abrasive particles are edged from the surface of the grinding wheel;
spark discharge occurs between the
metal bond and whirling conducting chips generated when the edged diamond
abrasive particles
cut the
copper electrode, generated instant high temperature is transmitted to
cutting edges of the diamond
abrasive particles in contact
cutting through the chips, the tips of the
cutting edges are pneumatically dressed, and accordingly micro edging, dressing and truing of the grinding wheel are achieved, more effective abrasive particles are generated and efficient grinding of smooth mirrors is achieved.