Tyrolit - Precision Catalog Strana 180
Nabídka komerčních zákazníků **Nejlépe prodávané z Tyrolit – Schleifmittelwerke
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SAFETY CUTTING AND GRINDING 178 Checking of grinding wheels prior to clamping Clamping methods for grinding wheels Each time before clamping, the grinding wheels must be cleaned and checked visually for damage. Depending on the type of machine and grinding method, as well as the grinding wheel shape, a distinction can be made between the following clamping methods The sound test should be repeated. Damaged grinding wheels must not be mounted. For the sound test, lightweight grinding wheels are put onto a mandrel or a finger, heavy grinding wheels are placed on firm ground. The grinding wheel is tapped with a non-metal object on several points. An undamaged grinding wheel gives a clear ring, while a damaged one gives a dull or clanking sound. All contact surfaces on grinding wheels, intermediate layers and wheel flanges must be level (flat) and be free of foreign bodies. Foreign particles between grinding wheels and wheel flanges create pressure points and tension, which can lead to the grinding wheel breaking. – Mounting by the central bore using wheel flanges – Mounting by using embedded fixing elements – Mounting by using support plates – Mounting by using clamping head Mounting by the central bore using wheel flanges A distinction should be made between the following wheel flange types for central bores Only wheel flanges that have the same external diameter and the same shape on the contact side may be used. They must be recessed so that only a ring-shaped area of the wheel flange is on the surface. Clamping by using embedded fix ing elements The grinding wheels are fixed by using embedded fixing elements on the grinding machine. Examples of this are the clamping of cylindrical and taper cup wheels, or the fixing of mounted points with embedded steel shafts in collets on portable grinding machines. Clamping of grinding wheels on support plates Grinding wheels will be either screwed or stuck together with the support disc. – Recessed wheel flange – Straight wheel flanges for portable grinding machines – Special flanges – Stepped flanges – Locating flanges and tapered wheel flanges The purpose of the wheel flanges is to transfer drive forces. They must therefore be in such a condition that there is no deformation of the wheel flange during clamping. The contact surfaces must be level (flat) and must not show any burring, and the run-out of the grinding wheel must be safeguarded. Clamping of grinding segments in clamping heads Grinding segments are clamped to one grinding unit (segment head) in clamping heads. On the contact surfaces between the grinding segments and the clamping pieces, adhesive strips can be placed on the grinding segments to avoid tension in the grinding segments.
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