|Title||Grinding wheel rotation strength is unqualified|
|Description||Rotational strength refers to the ability of the long life grinding wheel to resist cracking under the action of centrifugal force, reflecting the tensile stress of the grinding wheel. It is a very important indicator of the manufacture and use of the grinding wheel. In order to ensure the safe use of the grinding wheel, the standard classifies the unsatisfactory slewing strength as a "fatal defect", that is, "a defect that is dangerous or unsafe to the user or the device". The sampling inspection scheme is that the number of samples is n=10, the number of receptions is Ac=0, and the number of rejections is Rc=1; that is, the rotation strength of 10 grinding wheels must be all qualified, and if one piece fails, it is judged as unqualified. Quality inspections over the years have found that the slewing strength of fiber reinforced resin sheet grinding wheels is not ideal, some are lower than the high working speed, some ruptures when the speed of the test is not reached; some also reach the test speed but cannot be maintained for the 30s. The unsatisfactory ratio of the rotation strength is 7.1% to 18.7%. When the long life grinding wheel is used, it is mostly hand-held cutting and grinding. The distance between the operator and the grinding wheel is relatively close. Therefore, once the rotating strength is poor, the grinding wheel is broken during the cutting or grinding process, which is likely to cause personal injury and death.|
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