This standard is applicable to the determination of the performance of general-purpose horizontal balancing machines with soft and hard bearings. This standard is equivalent to the corresponding parts of ISO 2953 Second Edition-1981. GB/T 4201-1984 Verification method for general-purpose horizontal balancing machines GB/T4201-1984 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Method of verificationforuniversalhorizontalbalancingmachinesUDC621-79:53
.089.6
GB4201—84
This standard is applicable to the determination of the performance of universal horizontal balancing machines with soft and hard bearings (excluding the verification of the performance of half-balance machines with extended extension). This standard is equivalent to the corresponding parts of ISO2953, second edition, 1981. 1 Verification items and definitions
1.1 Minimum achievable residual unbalance (e.): The minimum value of the residual unbalance that the balancing machine can achieve. The minimum achievable residual unbalance is the performance indicator of the maximum balancing ability of the balancing machine. It is expressed in g·mm/kg. 1.2 Unbalance reduction rate (URR): The ratio of the unbalance reduced by a balancing correction to the initial unbalance. It is a performance indicator to measure the efficiency of the balancing machine. The unbalance reduction rate is usually expressed as a percentage. URR-UL-U,-||tt| |Where: }—initial unbalance;
U——residual unbalance after the first half-balance correction. 2 Check rotor
2.1 Check rotor is made of steel, and its shape should conform to the provisions and requirements of Figure 1. National Bureau of Standards 198403-12 issued
×100%...
01 implementation
Belt contact surface
X-axis end cabinet
Belt excitation rotor
GB4201-84
Hainan total test section ||t t||“A\, Sichuan R calibration
two
equally divided "0" holes, use the spectrum to balance
get the end of the south, the 12
equally divided "" holes on the diameter of the figure, use the calibration of the silt
screw holes and the number and
of the shaft end rotation
figure [edge test rotation
Note: The test should meet the following conditions: 4B/2; (B/2.2 If a ball shaft is used to support the seat, a shoulder ring should be provided to allow the center of the ball bearing to reach the required Specified distance, 3) You can also use 8 holes 45 "angle interval calibration wire. 2.2 The quality and size of the calibration wheel shall comply with the requirements of Table 1. 2.3 The calibration wheel should be provided by the manufacturer. The calibration wheel with a mass of less than 0.5kg and more than 500kg can be solved by the manufacturer.
GB4201
00009200009
(79°0
T000'0
3 Test weight
3.1 Shape of test weight
GB 4201--84
Should be a cylindrical head screw with a step, etc., and its center of mass position should be given before calibration. 3.2 Test weight quality accuracy requirements
It should be within 0.5% when testing e, and within 0.1×(100%-URR) when testing URR. 3.3 Test weight installation position requirements
The test weight installation position should be 30° (or 45°) apart on the same radius of each test plane, and the zero-degree reference on each test plane should be in the same angular direction (on the same half plane passing through the axis of rotation). The installation position should have the following accuracy relative to the correct position: a. The ratio of the axial deviation to the test plane spacing is within the percentage specified by 0.1×(100%-URR); b. The ratio of the radial position deviation to the radius is within the same percentage as above; c. The ratio of the angular position deviation (in radians) to 1 radian is within the same percentage as above. For example, 0.6%0.34 (1 radian = 57.3°).
3.4 ​​Example of test weight calculation
The mass of the No. 5 calibration rotor is 50kg,
The nominal minimum residual unbalance eo=1g·mm/kg, and the unbalance on each test plane of the corresponding calibration rotor is expressed by U per surface. 50kg×1g·mm/kg=25g.mmWww.bzxZ.net
1U per surface
If the correction radius of the test weight is 44mm
=10×25g-mm
Then the test weight (10U per surface)
4 Verification conditions
4.1 Environmental conditions:
a. Room temperature 10～40℃;
b. Relative humidity does not exceed 85%;
c. The fluctuation of the power supply voltage does not exceed the nominal ±10%d. Other conditions shall be in accordance with the provisions of the balancing machine manual. 4.2 Selection of the test rotor
Select the two test rotors near the two ends according to the rotor mass range of the balancing machine. 4.3 Balancing speed
For light test rotors, use the lowest speed specified in the balancing machine manual. For heavy test rotors, use the highest speed specified in the balancing machine manual. 5 Checking the minimum residual unbalance
5.1 Balance the check rotor until the residual unbalance is less than 5eo35.2 When checking the rotor on any two non-test planes, add test weights equivalent to the (10~20) planes on the test planes at the same time. The relative positions of the two test weights are not allowed to be in phase or in reverse phase; 5.3 According to the procedure and balancing speed specified by the balancing machine, start balancing no more than 4 times on the two test planes (avoid the "N" hole) according to the readings of the balance machine (on-site test weights are allowed). The position and number of each test weight addition should be recorded in detail to check whether the test weight has flown out or fallen off;
5.4 For balancing machines with couplings, rotate the coupling 60° or 90° relative to the check rotor; 5.5 Use two test weights of 10U each side to add them to the "O" holes on the left and right end faces at the same time and in phase. The order is arbitrary. Position 0, 286
GB 4201-84
30°, 60°, 90°120°, 150″, 180°, 210°, 240°, 270°, 300°, 330° or (0°, 45, 90, 135, 180225, 270°, 315°) Test the corresponding reading A; record it in attack 3; 5.6 According to the operating procedures, only one reading is allowed for each room movement; 5.7 Calculation of the arithmetic mean value A of A
A=10A or A
Where: A,—the reading value of any point of 12 points (or 8 points); A-the arithmetic mean of the readings of 12 points (or 8 points); 8
Ao—the corresponding reading value of the instrument when a test weight of 1U is added to each side of a certain end face; 5.8A; All readings should meet the requirements of the following formula, then the calibration of eo is qualified. 8.8A≤A, 11.2A
If there is shaking or swimming during reading, the maximum and minimum values ​​should be recorded truthfully. These values ​​should also meet the requirements of the following formula: 8.8A4: (maximum and minimum values) 11.2A6 Verification of unbalance reduction rate
6.1 Preparation before verification
6.1.1 Verify the balance until the remaining unbalance is less than 18 (below. 6.1.2 Prepare two groups of test weights.
First group:
2 fixed test weights of 5U/each side;
2 movable test weights of 25U.
Second group:
2 fixed test weights of 25U/each side;
125 U Move 2 test weights on each side.
(3)
6.1.3 Use polar coordinate paper to draw the test results, with the polar coordinate origin as the drawing origin. The point above the drawing origin equal to 5U (or 25U per side) is the origin of the allowable circle diagram. 6.1.4 Take the origin of the allowable circle diagram as the center and 25U per side (or 125U per) as the radius of the circle. The intersection of this circle and 12 radial lines (or 8 lines with an interval of 45°) with polar angles (with the origin of the allowable circle diagram as the vertex) of 0°, 30°, 60°, 90°, 120°, 150°, 180°, 210°, 240°, 270°, 300°, and 330″ is the center of the allowable circle. 6.1.5 Draw a circle with r as the radius at the center of each allowable circle. The allowable radius is calculated as follows:
R, α, °C, β as shown in Figure 2
r1+R1-URR)
R =α2+c2-2accos B
Allowable national original
Diagram: α-
Constant test weight;
-Moving test weight:
Price chart incentive
GB4201—84
Detailed use of the center
-a and °C (unbalance refers to the size of the composite loss, the distance from the origin of the drawing to the center of the allowable circle: the angle between the constant test weight and the moving test weight; -180 -α:
R and a angle,
Allowable circle radius;
All length dimensions (a, c, R, r) are multiples of U. 6.2 Verification procedure
Select any of the 12 (or 8) "N" holes on the test plane as the position of the extended test weight 5 (chain surface (or 6.2.1
25 before), but the positions of the left and right two weeks of fixed test weights must not be in phase or in reverse phase. 6.2.2 Select any of the 12 (or 8) "N" holes on the left and right test surfaces as the starting position of the moving test weight 25 (/(or 125 (surface).
6.2.3 The moving test weight on the left test plane increases by 30" (or 45") each time, and the moving test weight on the right test plane decreases by 3° (or 45°) each time, and is skipped when the fixed test weight is encountered. 6.2.4 Record the test weight positions and each reading of procedures 6.2.1 to 6.2.3 in Table 4, and place the readings in the allowable circle Figure 1. 6.2.5 All readings in the 6.2.4 procedure hall shall be qualified if they are within the corresponding allowable circle. Summary: If there is always a reading that is not within the allowable μ, the corresponding (5U sample surface) Repeat the test for 125V and 25U or 125U) once. At this time, all readings must fall within the permissible range. If two readings are not within the permissible range, it is allowed to readjust the balancing machine and retest under interphase conditions.
7 Record table
7.1 See Table 2 for the record table of four balancing measurements. 7.2 See Table 3 for the record table of the minimum achievable residual unbalance test. 7.3 See Table 4 for the record table of the unbalance reduction rate URR test. 8
GB4201-84
GB4201-84
GB4201-84
Additional remarks:
This standard was proposed and approved by the Ministry of Machinery Industry of the People's Republic of China. This standard was drafted by Changchun Testing Machine Research Institute. The main drafters of this standard are Ge Fangsen and Zhu Xiaonong. 92
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