Based on the grinding-hardening test, the types of two-side direction burr were classified; The changing rules of size in the two-side direction burr and the influence of grinding method on the maximum burr size were studied. The results shown, that the size of the burr was increased gradually from the cut-in point to the cut-out point of grinding in one-passes grinding. In two-passes grinding or three-passes grinding, the burr was basically the same. Under this experimental condition, the changing of grinding method affected the height of the burr more, but little to the thickness of the burr root. Meanwhile, the ways of restraining or decreasing the size of the burr in grinding-hardening machining were developed.
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