Balancing process and method of dynamic balancing machine
Article category：Product Knowledge
Post date：2025-06-11 12:00:40
Balancing process and method of dynamic balancing machine
The balancing process and method of dynamic balancing machine; The process of rotor balancing, also known as balance testing, involves measuring the unbalance of an unbalanced rotor and correcting it to eliminate it. It is an important process in rotor machining.
1. The choice of school front
The operation of eliminating the imbalance of the rotor and putting it in a balanced state is called balance correction. Balance correction is performed on a plane perpendicular to the rotor axis, which is called the correction plane. The method of correcting balance within one calibration plane is called single-sided balance or static balance, while the method of correcting within two or more calibration planes is called double-sided balance or multi-faceted balance or dynamic balance. For rotors with large initial unbalance and excessive vibration during rotation, single-sided balancing should be performed before dynamic balance verification to eliminate static unbalance. Sometimes, due to improper selection of the front position of the school (i.e., the center of gravity is not within the selected front), correcting the static balance can actually increase the even imbalance. Therefore, the front of the school is chosen to be located within the plane of the center of gravity to reduce occasional imbalances. If the plane where the center of gravity is located does not allow for weight removal, it should generally be done on two planes located on either side of the plane where the center of gravity is located. For rigid rotors, they generally have static unbalance and even unbalance. To achieve balance, the imbalance can be corrected in two correction planes perpendicular to the axis, which is called double-sided balance. The correction method is generally carried out by adding weights (such as using balance blocks) or removing weights (such as punching holes). The position of the calibration plane is generally determined by the structure of the rotor. To reduce the time and effort spent on balancing operations, efforts should be made to minimize the amount of correction. To achieve good balancing results, the distance and correction radius between the two calibration surfaces should be increased as much as possible under possible conditions.
2. Verification method
The imbalance of a rotor is caused by the misalignment of its central principal axis of inertia with the axis of rotation, and balance correction is to change the mass distribution of the rotor so that its central principal axis of inertia coincides with the axis of rotation to achieve balance. The commonly used correction methods include adjusting the correction weight, adding or removing weight, etc.
Weighting can be achieved through screw connection, riveting, and welding, which can improve the balance effect and higher balance accuracy of the rotor, and is convenient and safe. Drilling, grinding, chiseling, milling and other methods are often used for weight removal. Grinding is used to remove weight from the rotor and impeller of the pump, or weight is added to the coupling. The choice of calibration method depends on the rotor structure and process requirements, as well as the geometric shape of the calibration surface. Generally, when designing a rotor, the position for adding or removing weight should be taken into consideration.
3. Correction error
In the balancing process, in addition to the measurement error of the balancing machine, there are also errors caused by inaccurate balance correction (including the size and position of the correction amount), which are called correction errors. It can be divided into correction angle error, correction amplitude error, correction radius error, and correction plane position error. In practical calibration, most of the four types of errors mentioned above appear as a combination, and should be considered comprehensively when analyzing. In addition, the ratio between the initial unbalance and the remaining unbalance, as well as the impact of the unbalance reduction rate of the dynamic balancing machine, should also be considered.
The balancing process and method of dynamic balancing machine; The process of rotor balancing, also known as balance testing, involves measuring the unbalance of an unbalanced rotor and correcting it to eliminate it. It is an important process in rotor machining.
1. The choice of school front
The operation of eliminating the imbalance of the rotor and putting it in a balanced state is called balance correction. Balance correction is performed on a plane perpendicular to the rotor axis, which is called the correction plane. The method of correcting balance within one calibration plane is called single-sided balance or static balance, while the method of correcting within two or more calibration planes is called double-sided balance or multi-faceted balance or dynamic balance. For rotors with large initial unbalance and excessive vibration during rotation, single-sided balancing should be performed before dynamic balance verification to eliminate static unbalance. Sometimes, due to improper selection of the front position of the school (i.e., the center of gravity is not within the selected front), correcting the static balance can actually increase the even imbalance. Therefore, the front of the school is chosen to be located within the plane of the center of gravity to reduce occasional imbalances. If the plane where the center of gravity is located does not allow for weight removal, it should generally be done on two planes located on either side of the plane where the center of gravity is located. For rigid rotors, they generally have static unbalance and even unbalance. To achieve balance, the imbalance can be corrected in two correction planes perpendicular to the axis, which is called double-sided balance. The correction method is generally carried out by adding weights (such as using balance blocks) or removing weights (such as punching holes). The position of the calibration plane is generally determined by the structure of the rotor. To reduce the time and effort spent on balancing operations, efforts should be made to minimize the amount of correction. To achieve good balancing results, the distance and correction radius between the two calibration surfaces should be increased as much as possible under possible conditions.
2. Verification method
The imbalance of a rotor is caused by the misalignment of its central principal axis of inertia with the axis of rotation, and balance correction is to change the mass distribution of the rotor so that its central principal axis of inertia coincides with the axis of rotation to achieve balance. The commonly used correction methods include adjusting the correction weight, adding or removing weight, etc.
Weighting can be achieved through screw connection, riveting, and welding, which can improve the balance effect and higher balance accuracy of the rotor, and is convenient and safe. Drilling, grinding, chiseling, milling and other methods are often used for weight removal. Grinding is used to remove weight from the rotor and impeller of the pump, or weight is added to the coupling. The choice of calibration method depends on the rotor structure and process requirements, as well as the geometric shape of the calibration surface. Generally, when designing a rotor, the position for adding or removing weight should be taken into consideration.
3. Correction error
In the balancing process, in addition to the measurement error of the balancing machine, there are also errors caused by inaccurate balance correction (including the size and position of the correction amount), which are called correction errors. It can be divided into correction angle error, correction amplitude error, correction radius error, and correction plane position error. In practical calibration, most of the four types of errors mentioned above appear as a combination, and should be considered comprehensively when analyzing. In addition, the ratio between the initial unbalance and the remaining unbalance, as well as the impact of the unbalance reduction rate of the dynamic balancing machine, should also be considered.
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