Dry grinding wheels and wet grinding wheels differ greatly in bonding agent formula, internal structure, applicable working conditions and processing effect. Dry-type grinding wheels adopt looser tissue structure and relatively soft bond, designed to dissipate high grinding heat via natural air convection without coolant; they feature larger pores to avoid wheel clogging caused by high-temperature melted workpiece scraps, fit rough cutting, rust-prone and water-sensitive materials like cast iron, carbon steel and hard alloy under no-coolant field operation, with simpler supporting equipment but shorter service life and heavier dust emission during processing. In contrast, wet grinding wheels are made of dense, high-strength bond materials such as ceramic or metal, matching continuous coolant flushing in working; cutting fluid takes away massive friction heat and washes away grinding debris instantly to prevent workpiece burning and wheel loading, greatly prolonging wheel service life by 30%~50%, delivering finer surface finish and stable dimensional precision, which is ideal for precision grinding of stainless steel, aluminum alloy, quenched steel and large-batch continuous production, yet extra cooling circulation system and waste liquid disposal increase overall operating cost.