Rotor correction surface selection
Published:
2019-06-05 13:58
The so-called correction surface is also a special plane selected by man, in which an unbalanced amount of material is removed or fed. This plane is called a correction plane. Depending on the structural shape of the rotor, the correction surface can be one surface, or two planes or several planes. If the average outer diameter of the rotor is much higher than the net length, that is, a thin disc-type rotor, such as a clutch disc, a grinding wheel, a flywheel, and the like. Because the even imbalance of the rotor is small, it often does not affect the requirements of the actual application, so only the force imbalance needs to be performed, that is, only one balance surface is selected. This balance method is called single-sided balance, and For most rotors, we generally think that the amount of even imbalance they have is not negligible. In this case, in order to eliminate the even unbalance and the static unbalance at the same time, it is necessary to select two mutually spaced planes in the direction perpendicular to the rotating shaft, and then divide the dynamic unbalanced vector into two correction planes. The calibration form is called double-sided balancing, and for most rotors, double-sided balancing is currently used. In theory, the two balance correction planes can be arbitrarily selected as long as they are at different positions in the axial direction. However, in the actual correction, the selection of the correction planes must take into account many factors. For example, due to the characteristics of the rotor structure, some places cannot be removed. Heavy or heavy, and taking into account the correction error caused by the positional deviation of the correction surface, the distance between the two correction surfaces should be as large as possible. In addition to this, the choice of the correction radius is also considered. As mentioned above, the size of the unbalanced vector is the product of the unbalanced mass and the size of the vector. Therefore, in principle, as long as the conditions permit, you should try to choose a large correction radius, so that you can reduce the imbalance of weighting or de-weighting. Because of the correction error caused by weighting or de-duplication, and the correction operation, the weighting and de-duplication will take time and labor, so the amount of imbalance should be minimized. Due to the above various factors, the correction surface of the double-sided correction is usually selected at both ends of the rotor or near both ends, and the weighting or de-weighting operation is performed on the outer circumference of the rotor or near the outer circumference.
Because the workpiece is a flywheel, its average outer diameter is much higher than the axial length, so only one-sided correction is required according to the standard, and according to the shape and de-weighting method of the flywheel, we choose the end face drill. The hole de-weighting method is used for correction. Since the one-sided balance can ignore the even unbalance, the deviation caused by the end face centroid shift does not need to be considered in the correction process.
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