After grinding, the workpiece surface roughness Ra<0.01m, the light like mirror, can be clearly imaging, so it is called mirror grinding. The flatness of the grinding surface is not greater than 3m/1000mm. Surface grinding of high precision and high added value parts is required.

Ultra-high strength steel is a kind of alloy steel used to make structural parts under high stress. General flexural strength is greater than 1180MPa, tensile strength is greater than 1380MPa this kind of steel generally has enough toughness and high specific strength and flexural ratio, and good weldability and formability. According to alloying degree and microstructure, it can be divided into low alloy, medium alloy and high alloy ultra-high strength steels. When grinding ultra-high strength steel, the grinding force, grinding temperature and grinding surface quality of workpiece will be greatly affected by the grinding amount. Increasing the grinding wheel speed can decrease the grinding force but increase the grinding temperature.

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The lubrication effect of the grinding fluid is good, which can protect the grinding wheel and the workpiece at the same time, reduce the resistance during grinding, improve the processing efficiency and the surface quality of the workpiece. Good lubrication effect is also shown in good chip separation effect, that is, it plays a lubricating role, but the chip is not easy to bond to the workpiece or grinding wheel surface, the separation effect is good. At the same time, the general grinding fluid is alkaline, and its PH value must be strictly controlled (generally 9~10, not more than 11). If the alkalinity is too strong, it will neutralize and corrode the acidic resin grinding wheel, soften the grinding wheel, and reduce the service life of the grinding wheel.

Precision grinding refers to the selection of fine grain grinding wheel on the precision grinding machine, and through the fine dressing of grinding wheel, so that the grinding grain has micro edge and isometric property. After grinding, the grinding marks left by the grinding surface are extremely fine and the residual height is extremely small.

The general principle for selecting hard grinding wheel is as follows:

(1) When the grinding tooth surface is in discontinuous state, a hard grinding wheel should be selected.

(2) In order to maintain better grinding accuracy, hard grinding wheel was selected. When carburizing and hardening gears are grinding, the grinding wheel with medium hardness is selected.

Bonding agent: bonding agent is the abrasive material bonded together. The strength, impact resistance and heat resistance of grinding wheel mainly depend on the type and nature of bonding agent of grinding wheel.

For carburized and hardened gear grinding, the vitrified diamond grinding wheel should be selected.