Balancing process and method of dynamic balancing machine; The unbalanced rotor is measured and corrected to eliminate its unbalance. This is the process of rotor balancing, also known as balancing test. It is an important process in rotor machining.
1. Selection of school front
The operation of eliminating the unbalance of the rotor and keeping it in balance is called balance correction. Balance correction is carried out on a plane perpendicular to the rotor axis, which is called the correction plane. The method of correcting balance in only one correction plane is called single-sided balance or static balance, and the method of correcting in two or more correction planes is called double-sided balance or multi-surface balance or dynamic balance. For rotors with large initial unbalance and excessive vibration during rotation, single-side balancing shall be carried out before dynamic balancing to eliminate static unbalance. Sometimes, due to the improper selection of the calibration front position (that is, the center of gravity is not within the selected calibration front), the couple imbalance will increase after the static balance is corrected. Therefore, the front calibration is carried out in the plane where the center of gravity is located to reduce the couple imbalance. If the weight removal is not allowed in the plane where the center of gravity is located, it shall be carried out on two planes on both sides of the plane where the center of gravity is located. For rigid rotors, there are usually static unbalance and even unbalance. To achieve balance, the imbalance can be corrected in two randomly selected correction planes perpendicular to the axis, which is called double-sided balance. The correction method is generally carried out by adding weight (such as balancing weight) or removing weight (such as drilling). The position of the correction plane is generally determined by the structure of the rotor. In order to reduce the time and labor spent in the balancing operation, we should try to reduce the amount of correction, so as to increase the distance and correction radius between the two calibration faces as much as possible under possible conditions to achieve good balancing effect.
2. Calibration method
The unbalance of the rotor is caused by the non-coincidence of its central principal inertia axis and the rotation axis, and the balance correction is to change the mass distribution of the rotor to make its central principal inertia axis coincide with the rotation axis to achieve balance. Common correction methods include adjusting the correction weight, adding weight or removing weight, etc.
The weight can be connected by screws, riveted and welded. This method can make the rotor achieve better balance effect and higher balance accuracy, and is convenient and safe. Drilling, grinding, chiseling, milling and other methods are often used for weight removal. The rotor parts and impeller of the pump shall be removed by grinding, or the weight shall be balanced on the coupling. The choice of correction method depends on the rotor structure and process requirements as well as the geometric shape of the front face. Generally, the position of weighting or de-weighting shall be considered in the design of rotor.
3. Correction error
In the process of balancing, in addition to the measurement error of the balancing machine, there are also errors caused by the inaccuracy of 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 the actual correction, most of the above four kinds of errors are comprehensive, and should be considered comprehensively in the analysis. In addition, the proportion between the initial unbalance and the remaining unbalance, as well as the influence of the unbalance reduction rate of the dynamic balancing machine, should also be considered.
Foshan Huake Zhichuang Intelligent Equipment Co., Ltd. is an integrated enterprise focusing on the R&D, production and sales of automatic and semi-automatic balancing machines. It focuses on the R&D of intelligent and differentiated products, has the hard power of software development and mechanical design, promotes the development of balancing machine industry, and aims to become a leading enterprise in the balancing machine industry.
1. Selection of school front
The operation of eliminating the unbalance of the rotor and keeping it in balance is called balance correction. Balance correction is carried out on a plane perpendicular to the rotor axis, which is called the correction plane. The method of correcting balance in only one correction plane is called single-sided balance or static balance, and the method of correcting in two or more correction planes is called double-sided balance or multi-surface balance or dynamic balance. For rotors with large initial unbalance and excessive vibration during rotation, single-side balancing shall be carried out before dynamic balancing to eliminate static unbalance. Sometimes, due to the improper selection of the calibration front position (that is, the center of gravity is not within the selected calibration front), the couple imbalance will increase after the static balance is corrected. Therefore, the front calibration is carried out in the plane where the center of gravity is located to reduce the couple imbalance. If the weight removal is not allowed in the plane where the center of gravity is located, it shall be carried out on two planes on both sides of the plane where the center of gravity is located. For rigid rotors, there are usually static unbalance and even unbalance. To achieve balance, the imbalance can be corrected in two randomly selected correction planes perpendicular to the axis, which is called double-sided balance. The correction method is generally carried out by adding weight (such as balancing weight) or removing weight (such as drilling). The position of the correction plane is generally determined by the structure of the rotor. In order to reduce the time and labor spent in the balancing operation, we should try to reduce the amount of correction, so as to increase the distance and correction radius between the two calibration faces as much as possible under possible conditions to achieve good balancing effect.
2. Calibration method
The unbalance of the rotor is caused by the non-coincidence of its central principal inertia axis and the rotation axis, and the balance correction is to change the mass distribution of the rotor to make its central principal inertia axis coincide with the rotation axis to achieve balance. Common correction methods include adjusting the correction weight, adding weight or removing weight, etc.
The weight can be connected by screws, riveted and welded. This method can make the rotor achieve better balance effect and higher balance accuracy, and is convenient and safe. Drilling, grinding, chiseling, milling and other methods are often used for weight removal. The rotor parts and impeller of the pump shall be removed by grinding, or the weight shall be balanced on the coupling. The choice of correction method depends on the rotor structure and process requirements as well as the geometric shape of the front face. Generally, the position of weighting or de-weighting shall be considered in the design of rotor.
3. Correction error
In the process of balancing, in addition to the measurement error of the balancing machine, there are also errors caused by the inaccuracy of 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 the actual correction, most of the above four kinds of errors are comprehensive, and should be considered comprehensively in the analysis. In addition, the proportion between the initial unbalance and the remaining unbalance, as well as the influence of the unbalance reduction rate of the dynamic balancing machine, should also be considered.
Foshan Huake Zhichuang Intelligent Equipment Co., Ltd. is an integrated enterprise focusing on the R&D, production and sales of automatic and semi-automatic balancing machines. It focuses on the R&D of intelligent and differentiated products, has the hard power of software development and mechanical design, promotes the development of balancing machine industry, and aims to become a leading enterprise in the balancing machine industry.
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