1. Identification and selection of grinding wheel
The shape and size of the grinding wheel are mainly selected according to the conditions of the grinding machine, the shape of the workpiece, and the nature of the material. Generally, the appearance and crack identification are required after the selection of the grinding wheel. However, sometimes the crack is not easy to observe inside the grinding wheel, so the sounding test method is used, such as tapping the sound with a wooden mallet, and the sound is crisp, which is a good grinding wheel without cracks. When considering the size, generally, the outer diameter should be selected as large as possible; when grinding longitudinally, a wider grinding wheel should be used; when grinding the inner circle, the outer diameter of the grinding wheel should be about 2/3 of the workpiece aperture. In particular, it should be noted that the line speed when the grinding wheel is used must not exceed the value of the mark.
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2. Balance and installation of the grinding wheel
The unbalanced grinding wheel will vibrate when it is rotating at an idle speed, which will affect the processing quality and machine tool precision. In severe cases, it will cause the grinding wheel to rupture, endangering the safety of people and equipment. The cause of the imbalance is mainly the uneven density of the grinding wheel parts, the asymmetrical geometry and the installation eccentricity. Therefore, the grinding wheel must be balanced before installation. The balance of the grinding wheel has two types: static balance and dynamic balance: in general, only static balance is required; and in high-speed grinding and high-precision grinding, dynamic balance must be performed. For large-diameter grinding wheels, after using for a period of time, there is a possibility of imbalance due to the wear of the grinding wheel, and it is necessary to balance again.
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