Rotating components such as motor rotors, machine tool spindles, fan impellers, turbine rotors, automotive parts, and air conditioning blades need to undergo dynamic balance correction during the manufacturing process in order to operate smoothly and normally. Correcting the unbalance of the rotor based on the data measured by the balancing machine can improve the mass distribution of the rotor relative to the axis, reducing the vibration generated during rotor rotation or the vibration force acting on the bearings to within the allowable range. Therefore, a balancing machine is an essential equipment for reducing vibration, improving performance, and enhancing quality. Usually, the balancing of a rotor involves two steps: measuring and correcting the unbalance, and a balancing machine is mainly used for measuring the unbalance.
A dynamic balancing machine is a machine that measures the magnitude and position of the unbalance of a rotating object (rotor), as the rotor generates centrifugal force due to uneven mass distribution relative to its axis when rotating around its axis. This unbalanced centrifugal force acting on the rotor bearings can cause vibration, generate noise, and accelerate bearing wear, which seriously affects the performance and service life of the product. Therefore, a balancing machine should be used for testing.
The main performance of a dynamic balancing machine is represented by two comprehensive indicators: the minimum achievable residual unbalance and the unbalance reduction rate. The former is the minimum value of the residual unbalance that the balancing machine can achieve in the rotor, and it is an indicator of the highest balancing capacity of the balancing machine; The latter is the ratio of the reduced imbalance after a correction to the initial imbalance, which is an indicator of balance efficiency and is generally expressed as a percentage.
Balancing Machine
What are the professional terms that need to be understood before operating a dynamic balancing machine? The dynamic balancing machine technician has compiled the following:
1. Unbalanced phase: The angle value of the unbalanced mass on a certain plane of the rotor relative to a given polar coordinate.
2. Unbalanced mechanical quantity: The magnitude of the unbalance of a planar rotor and the angular position of the uncorrelated unbalance. This is equivalent to the product of the unbalanced mass and the distance between its center of mass and the rotor shaft, with the unit of unbalance being g.mm.
3. Initial unbalance: The unbalance that exists on the rotor before balancing.
4. Imbalance: The unit of mass imbalance in a rotor, measured in g.mm/kg. In static unbalance, it is equivalent to the eccentricity of the rotor mass, measured in micrometers
5. Remaining unbalance: The amount of unbalance remaining on the rotor after balancing.
6. Allowable unbalance: In order to ensure the normal operation of a rotating mechanical rotor, the allowable unbalance is expressed as an exponent of the unbalance degree, which is called the allowable unbalance degree.
7. Calibration radius: The distance from the center of mass of the calibration mass on the calibration plane to the rotor axis, generally expressed in millimeters.
8. Separation: The change in the calibration plane balance machine index value caused by a change in the correction amount of a given rotor imbalance.
9. Allowable residual unbalance per unit mass of rotor (rate): eper=(G × 1000)/(n/10) unit g.mm/kg or mm/s
10. Rotor balance quality: an indicator that measures the degree of superiority or inferiority of rotor balance, G=eperω/1000， In the formula, G represents the rotor balance mass, mm/s, Divided into 11 levels from G0 4-G4000, eper is the allowable unbalance rate g.mm/kg or rotor mass eccentricity μ m ω of the rotor, corresponding to the angular velocity of the maximum working speed of the rotor=2 π n/60 ≈ n/10.
11. Unequal Reduction Rate (URR): The ratio of the reduced unbalanced amount after one balance correction to the initial unbalanced amount. It is a performance indicator for measuring the efficiency of a balancing machine, expressed as a percentage: URR (%)=(U1-U2)/U1=(1-U2/U1) × 100, where U1 is the initial unbalanced amount; U2 is the residual unbalance after one balance correction.
12. Minimum achievable residual unbalance (Umar): The unit in g.m, which is the minimum value of residual unbalance that a balancing machine can achieve for the rotor. It is a performance indicator that measures the highest balancing capacity of the balancing machine. When this indicator is expressed in terms of unbalance, it is called the minimum achievable residual unbalance (g.mm/kg).
13. Calibration rotor: Check the performance of the balancing machine and the design of the rigid rotor, including its quality, size, dimensions, and whether it is vertical or horizontal
The mass of the vertical rotor is 1.1, 3.5, 10, 16, 42, 65, 100kg,
The mass of the horizontal rotor is 0.5, 1.6, 5, 16, 50, 160, 500kg
A dynamic balancing machine is a machine that measures the magnitude and position of the unbalance of a rotating object (rotor), as the rotor generates centrifugal force due to uneven mass distribution relative to its axis when rotating around its axis. This unbalanced centrifugal force acting on the rotor bearings can cause vibration, generate noise, and accelerate bearing wear, which seriously affects the performance and service life of the product. Therefore, a balancing machine should be used for testing.
The main performance of a dynamic balancing machine is represented by two comprehensive indicators: the minimum achievable residual unbalance and the unbalance reduction rate. The former is the minimum value of the residual unbalance that the balancing machine can achieve in the rotor, and it is an indicator of the highest balancing capacity of the balancing machine; The latter is the ratio of the reduced imbalance after a correction to the initial imbalance, which is an indicator of balance efficiency and is generally expressed as a percentage.
Balancing Machine
What are the professional terms that need to be understood before operating a dynamic balancing machine? The dynamic balancing machine technician has compiled the following:
1. Unbalanced phase: The angle value of the unbalanced mass on a certain plane of the rotor relative to a given polar coordinate.
2. Unbalanced mechanical quantity: The magnitude of the unbalance of a planar rotor and the angular position of the uncorrelated unbalance. This is equivalent to the product of the unbalanced mass and the distance between its center of mass and the rotor shaft, with the unit of unbalance being g.mm.
3. Initial unbalance: The unbalance that exists on the rotor before balancing.
4. Imbalance: The unit of mass imbalance in a rotor, measured in g.mm/kg. In static unbalance, it is equivalent to the eccentricity of the rotor mass, measured in micrometers
5. Remaining unbalance: The amount of unbalance remaining on the rotor after balancing.
6. Allowable unbalance: In order to ensure the normal operation of a rotating mechanical rotor, the allowable unbalance is expressed as an exponent of the unbalance degree, which is called the allowable unbalance degree.
7. Calibration radius: The distance from the center of mass of the calibration mass on the calibration plane to the rotor axis, generally expressed in millimeters.
8. Separation: The change in the calibration plane balance machine index value caused by a change in the correction amount of a given rotor imbalance.
9. Allowable residual unbalance per unit mass of rotor (rate): eper=(G × 1000)/(n/10) unit g.mm/kg or mm/s
10. Rotor balance quality: an indicator that measures the degree of superiority or inferiority of rotor balance, G=eperω/1000， In the formula, G represents the rotor balance mass, mm/s, Divided into 11 levels from G0 4-G4000, eper is the allowable unbalance rate g.mm/kg or rotor mass eccentricity μ m ω of the rotor, corresponding to the angular velocity of the maximum working speed of the rotor=2 π n/60 ≈ n/10.
11. Unequal Reduction Rate (URR): The ratio of the reduced unbalanced amount after one balance correction to the initial unbalanced amount. It is a performance indicator for measuring the efficiency of a balancing machine, expressed as a percentage: URR (%)=(U1-U2)/U1=(1-U2/U1) × 100, where U1 is the initial unbalanced amount; U2 is the residual unbalance after one balance correction.
12. Minimum achievable residual unbalance (Umar): The unit in g.m, which is the minimum value of residual unbalance that a balancing machine can achieve for the rotor. It is a performance indicator that measures the highest balancing capacity of the balancing machine. When this indicator is expressed in terms of unbalance, it is called the minimum achievable residual unbalance (g.mm/kg).
13. Calibration rotor: Check the performance of the balancing machine and the design of the rigid rotor, including its quality, size, dimensions, and whether it is vertical or horizontal
The mass of the vertical rotor is 1.1, 3.5, 10, 16, 42, 65, 100kg,
The mass of the horizontal rotor is 0.5, 1.6, 5, 16, 50, 160, 500kg
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