Rotating components such as motor rotors, machine tool spindles, fan impellers, turbine rotors, automotive components, and air conditioning blades require dynamic balance correction during the manufacturing process in order 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, a balancing machine is an essential equipment for reducing vibration, improving performance, and enhancing quality. Usually, rotor balancing involves two steps: measurement and correction of unbalance, and a balancing machine is mainly used for measuring unbalance.
A dynamic balancing machine is a machine that measures the magnitude and position of the unbalance 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 bearings 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 remaining unbalance and the reduction rate of unbalance. The former is the minimum residual unbalance 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 an indicator 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 Huake Zhichuang Dynamic Balancing Machine 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 capacity: The magnitude of the unbalanced capacity of a planar rotor, and the position of unrelated unbalanced angles. This is equivalent to the product of the unbalanced mass and the distance between its center of mass and the rotor axis, with the unbalance measured in grams per millimeter.
3. Initial unbalance: The amount of unbalance present on the rotor before balancing.
4. Unbalance: The unit of mass imbalance rotor, in grams per millimeter per kilogram. In the case of static imbalance, it is equivalent to the eccentricity of the rotor mass, in micrometers
5. Remaining unbalance: The remaining unbalance on the rotor after balancing.
6. Permissible unbalance: To ensure the normal operation of rotating machinery rotors, residual unbalance is allowed, and the index of unbalance is expressed as the allowable unbalance.
7. Correction radius: The distance from the centroid of the correction mass on the correction plane to the rotor axis, generally expressed in mm.
8. Separation: The change in the correction value of another correction plane balance machine caused by the change in the correction amount of the given rotor imbalance.
9. Permissible residual unbalance per unit mass of rotor (rate): eper=(G) × 1000)/(n/10) units: g. mm/kg or mm/s
10. Rotor balance quality: an indicator that measures the quality 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 maximum operating 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 unbalance amount; U2 is the remaining unbalance after a balance correction.
12. Minimum Reachable Remaining Unbalance (Umar): Unit: g. m, the minimum value of the remaining unbalance 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 unbalance, it is called the Minimum Reachable Remaining Unbalance (g. mm/kg).
13. Verify 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 unbalanced couple effect of a single-sided balancing machine.
A dynamic balancing machine is a machine that measures the magnitude and position of the unbalance 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 bearings 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 remaining unbalance and the reduction rate of unbalance. The former is the minimum residual unbalance 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 an indicator 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 Huake Zhichuang Dynamic Balancing Machine 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 capacity: The magnitude of the unbalanced capacity of a planar rotor, and the position of unrelated unbalanced angles. This is equivalent to the product of the unbalanced mass and the distance between its center of mass and the rotor axis, with the unbalance measured in grams per millimeter.
3. Initial unbalance: The amount of unbalance present on the rotor before balancing.
4. Unbalance: The unit of mass imbalance rotor, in grams per millimeter per kilogram. In the case of static imbalance, it is equivalent to the eccentricity of the rotor mass, in micrometers
5. Remaining unbalance: The remaining unbalance on the rotor after balancing.
6. Permissible unbalance: To ensure the normal operation of rotating machinery rotors, residual unbalance is allowed, and the index of unbalance is expressed as the allowable unbalance.
7. Correction radius: The distance from the centroid of the correction mass on the correction plane to the rotor axis, generally expressed in mm.
8. Separation: The change in the correction value of another correction plane balance machine caused by the change in the correction amount of the given rotor imbalance.
9. Permissible residual unbalance per unit mass of rotor (rate): eper=(G) × 1000)/(n/10) units: g. mm/kg or mm/s
10. Rotor balance quality: an indicator that measures the quality 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 maximum operating 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 unbalance amount; U2 is the remaining unbalance after a balance correction.
12. Minimum Reachable Remaining Unbalance (Umar): Unit: g. m, the minimum value of the remaining unbalance 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 unbalance, it is called the Minimum Reachable Remaining Unbalance (g. mm/kg).
13. Verify 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 unbalanced couple effect of a single-sided balancing machine.
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