During the manufacturing process, rotating components such as motor rotors, machine tool spindles, fan impellers, steam turbine rotors, automotive components, and air conditioning blades all require dynamic balance correction to operate smoothly and normally. Correcting the imbalance 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 bearing to the allowable range. Therefore, balancing machines are essential equipment for reducing vibration, improving performance, and improving quality. Usually, the balancing of a rotor involves two steps: measuring and correcting the imbalance, and a balancing machine is mainly used for measuring the imbalance.
A dynamic balancing machine is a machine that measures the magnitude and position of the imbalance of a rotating object (rotor). When the rotor rotates around its axis, centrifugal force is generated due to the uneven distribution of mass relative to the axis. This unbalanced centrifugal force acting on the rotor bearing can cause vibration, generate noise, and accelerate bearing wear, seriously affecting the performance and lifespan 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 imbalance and the reduction rate of imbalance. The former is the minimum residual imbalance that the balancing function can achieve for the rotor, and it is an indicator to measure the highest balancing capacity of the balancing machine; The latter is the ratio of the reduced imbalance after one correction to the initial imbalance, which is a measure of balance efficiency and is generally expressed as a percentage.
What are the professional terms that need to be understood before operating a dynamic balancing machine? The technical master of Shenman Dynamic Balancing Machine Factory has compiled them as follows:
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 capacity: The magnitude of the imbalance of a planar rotor, as well as the angular position of unrelated imbalances. This is equivalent to the product of the unbalanced mass and the distance between its centroid and the rotor axis, with the unit of unbalance being g. mm.
3. Initial Unbalance: The amount of imbalance that exists on the rotor before balancing.
4. Unbalance: The unit of mass imbalance rotor, in grams per kilogram. In static imbalance, it is equivalent to the eccentricity of the rotor mass, in micrometers
5. Remaining Unbalance: The remaining imbalance on the rotor after balancing.
6. Permissible Unbalance: To ensure normal operation of rotating machinery rotors, the allowable remaining imbalance is expressed by an index of the degree of imbalance, which is called the allowable imbalance.
7. Correction radius: The distance from the centroid of the correction mass on the correction plane to the rotor axis, usually expressed in mm.
8. Separation: The change in the correction value of another correction plane balance machine caused by a given change in the correction amount of rotor imbalance.
9. Permissible residual imbalance per unit mass of rotor (rate): per=(G × 1000)/(n/10) in units of g. mm/kg or mm/s
10. Rotor balance quality: an indicator to measure the degree of rotor balance, G=eper ω/ 1000, where G is the rotor balance mass, mm/s, divided into 11 levels from G0 to G4000, and eper is the allowable unbalance rate of the rotor, g. mm/kg, or the eccentricity of the rotor mass μ M ω The angular velocity corresponding to the highest working speed of the rotor is 2 π n/60 ≈ n/10.
11. Unbalance reduction rate (URR): The ratio of the reduced imbalance after one balance correction to the initial imbalance. It is a performance indicator that measures the efficiency of a balancing machine, expressed as a percentage: URR (%)=(U1-U2)/U1=(1-U2/U1) × In equation 100, U1 is the initial imbalance; U2 is the remaining imbalance after one balance correction.
12. Minimum Reachable Remaining Unbalance (Umar): Unit: g. m, the minimum value of the remaining imbalance that the 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 as imbalance, it is called the Minimum Reachable Remaining Unbalance (g.mm/kg).
13. Verifying the rotor: Check the performance of the balancing machine and the design of the rigid rotor, which has two types: vertical and horizontal in terms of mass, size, and size:
The mass of vertical rotors is 1.1, 3.5, 10, 16, 42, 65, and 100kg,
The mass of horizontal rotors is 0.5, 1.6, 5, 16, 50, 160, 500kg
14. Unbalanced couple interference ratio: The performance indicator for suppressing the effect of unbalanced couple in a single sided balancing machine.
A dynamic balancing machine is a machine that measures the magnitude and position of the imbalance of a rotating object (rotor). When the rotor rotates around its axis, centrifugal force is generated due to the uneven distribution of mass relative to the axis. This unbalanced centrifugal force acting on the rotor bearing can cause vibration, generate noise, and accelerate bearing wear, seriously affecting the performance and lifespan 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 imbalance and the reduction rate of imbalance. The former is the minimum residual imbalance that the balancing function can achieve for the rotor, and it is an indicator to measure the highest balancing capacity of the balancing machine; The latter is the ratio of the reduced imbalance after one correction to the initial imbalance, which is a measure of balance efficiency and is generally expressed as a percentage.
What are the professional terms that need to be understood before operating a dynamic balancing machine? The technical master of Shenman Dynamic Balancing Machine Factory has compiled them as follows:
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 capacity: The magnitude of the imbalance of a planar rotor, as well as the angular position of unrelated imbalances. This is equivalent to the product of the unbalanced mass and the distance between its centroid and the rotor axis, with the unit of unbalance being g. mm.
3. Initial Unbalance: The amount of imbalance that exists on the rotor before balancing.
4. Unbalance: The unit of mass imbalance rotor, in grams per kilogram. In static imbalance, it is equivalent to the eccentricity of the rotor mass, in micrometers
5. Remaining Unbalance: The remaining imbalance on the rotor after balancing.
6. Permissible Unbalance: To ensure normal operation of rotating machinery rotors, the allowable remaining imbalance is expressed by an index of the degree of imbalance, which is called the allowable imbalance.
7. Correction radius: The distance from the centroid of the correction mass on the correction plane to the rotor axis, usually expressed in mm.
8. Separation: The change in the correction value of another correction plane balance machine caused by a given change in the correction amount of rotor imbalance.
9. Permissible residual imbalance per unit mass of rotor (rate): per=(G × 1000)/(n/10) in units of g. mm/kg or mm/s
10. Rotor balance quality: an indicator to measure the degree of rotor balance, G=eper ω/ 1000, where G is the rotor balance mass, mm/s, divided into 11 levels from G0 to G4000, and eper is the allowable unbalance rate of the rotor, g. mm/kg, or the eccentricity of the rotor mass μ M ω The angular velocity corresponding to the highest working speed of the rotor is 2 π n/60 ≈ n/10.
11. Unbalance reduction rate (URR): The ratio of the reduced imbalance after one balance correction to the initial imbalance. It is a performance indicator that measures the efficiency of a balancing machine, expressed as a percentage: URR (%)=(U1-U2)/U1=(1-U2/U1) × In equation 100, U1 is the initial imbalance; U2 is the remaining imbalance after one balance correction.
12. Minimum Reachable Remaining Unbalance (Umar): Unit: g. m, the minimum value of the remaining imbalance that the 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 as imbalance, it is called the Minimum Reachable Remaining Unbalance (g.mm/kg).
13. Verifying the rotor: Check the performance of the balancing machine and the design of the rigid rotor, which has two types: vertical and horizontal in terms of mass, size, and size:
The mass of vertical rotors is 1.1, 3.5, 10, 16, 42, 65, and 100kg,
The mass of horizontal rotors is 0.5, 1.6, 5, 16, 50, 160, 500kg
14. Unbalanced couple interference ratio: The performance indicator for suppressing the effect of unbalanced couple in a single sided balancing machine.
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