2.3 carry out a check prior to installation of the wheel

2.3.1 Safety line speed wheel

In order not to cause errors, it is printed with safety signs on the wheel speed, especially in high-speed grinding wheel should be more eye-catching special signs. It must be used on the operating speed of the grinding wheel flag operation.

Currently in the process of bearing outer groove, the groove cut grinding step most people are using the high-speed wheel (50 a 6 0 m / s), centerless grinding, inner diameter grinding (Ha axis use the high-speed wheel), bis face grinding processes are generally used linear velocity of 35m / s wheel. Operator in previous work, have occurred outside the raceway grinding process without violation of the provisions originally should 12000r / min grinding wheel spindle speed adjusted to 18000r / min, due to causes beyond its safe wheel speed using broken lines occur .

2.3.2 Visual inspection (visual inspection)

. A wheel should be kept dry, clean, and not stick a foreign body;b. must proofread its safe operating speed for identity is unclear or unmarked wheel must be strictly prohibited.

2.3.3 Check percussion (sound check)

Vitrified grinding wheel before use this check. In practice there are many new workers to tap inspection methods do not have, not even this check, stay hidden for the occurrence of broken wheel.

The correct way to check is to be inspected abrasive placed securely (in the case of small wheel, finger caught, large size can be placed on hard ground.), With 200 300g of a rough wooden tap lightly tap points on either side of the wheel, perpendicular to the center line on both sides of 45 °, from the outer circumferential surface of the grinding wheel 20 at a 50m m (Figure 3), after the percussion wheel rotating 45 °. Repeated once. If the wheel is no crack crackled, used with permission. If you happen voiceless sound muffled or not allowed to use.