This standard specifies the method of evaluating the roundness error value by two-point and three-point measurement. This standard is applicable to measuring the roundness error of internal and external circular elements of parts. This standard is a specific regulation of GB/T1958 roundness error detection. GB/T 4380-2004 Evaluation of roundness error Two-point and three-point method GB/T4380-2004 standard download decompression password: www.bzxz.net

ICS17.04C.10
National Standard of the People's Republic of China
GB/T4380--2004
Replaces GB/4383-1984
Assessmcnt of dcparttre from roundness-I'wo-and three-point method
Assessmcnt of dcparttre from roundness-I'wo-and three-point method mcthods2004-11-11 Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Standardization Administration of China
2005-07-01 Implementation
Replaces GR/T1330-1984 to determine the method of two-point and two-point difference in degree
Compared with GB/T4340-1084, this standard has the following major changes: 1. The difficult terms are added to make them more accurate; 1. Normative references include the latest standard setting conditions; 1. The English name of the term:
"Term definition" The new concepts of the relevant standards are appropriately supplemented and modified: The standard is arranged in the format of GB/T12000. Appendix A of this standard is an informative appendix,
This standard is marked and assigned to the national product size and geometry specification standardization technical personnel. Drafting units: China Academy of Mechanical and Electrical Engineering, China Institute of Metrology and Information Technology. The main drafters of this standard are: China Academy of Mechanical and Electrical Engineering, China Academy of Metrology and Information Technology. The previous versions of the standards replaced by this standard are: GB/T 4.87-1964, GB/T4380-2004, 1 Scope, Two-point and three-point method for roundness error evaluation, This standard specifies the use of two-point and two-point method to evaluate the roundness error value: This standard is applicable to the measurement of the inner and outer circular elements of parts. This standard is a specific provision for the measurement of roundness error. GH/T 4380-2004, 10 points, three points, the numerical value of the measurement error is different from the international standard: The output and reading of this standard are given in detail. 2 Normative references
The following clauses are incorporated into this standard through reference in this standard. For dated references, all amendments (other details) or subscriptions to them shall not be included in this standard. However, the parties to this standard shall study whether the latest versions of these documents are available. For dated references, the latest versions shall be included in this standard. GH/T11%2 Shape Machine Position General Rules Meaning, symbols and drawings indicate protection ((H/11182--396.e1V5U1101:196)
GHT19 Shape and position public examination detection heat determination
G13/T18780.1 Product geometry technical specifications (GP9) Geometric elements Part 1: Basic terms and definitions (GR/:1k80.1-2J32.idIS)14660-1:1999)GB/T1878,? Product quality technical specification (GB/T1878: 32M2.JSO16S0-2, 199, 1L13 Terms and definitions
CB/T16FT195H.GB/187901 and GE/1870, 2 are based on the following terms and definitions in this standard.
Measurement of the angular error of the surface plane: nfmezserementFor theasgegsient ofdcparlurrfrumroundiress through the head will be a virtual contact half. When using two points, two-point method measurement data, the imaginary plane must be through the same fixed support.
Note: When measuring surface error, the part is vertical and its imaginary work is read "surface" and the measuring plane 3.2
The direction of the error is directly innnfmeasurementfortheasyeysmealufdepirlurefronnnndness along the measuring plane three increase the direction of the adjustment. 3.3
Two-point measurement wputeunene
Standing Lu is a measurement between a fixed measuring support and a measuring head on the measuring side, as shown in the figure,
Three-point measurement is a measurement carried out between two fixed measuring supports and a measuring head that can move upward under the measuring force. As shown in the figure. 1
CB/I 4380—2004
Fixed measuring support (i.e. V-shaped support) measuring angle. This is used for measuring the angle between the plate direction and the fixed measuring support from the bisector, Figure 2
Top three-point measurement0mmitmelhul
GB/T 4380—2004
Point measurement with the fixed measuring support in the center (1-)),)), c), 3.4.2
Type three-point measurementridemethad
A point measurement with the head located at the original yin support (or 1-). Figure), f, 3.4.3
ymmelrieai (thre-polnt) settingSymmetrical three-point measurement
Measurement with two fixed measuring supports from the bisector to the time interval: Figure 2a), b), e, the. 3. 4. 4
asymelrical (three-polat) setting
flux with two fixed points is measured in the same room. Figure 2c shows the technique: 3. 5
Calibration of sinuridal undulation on the surface of the measured needle. 3.6
cngection faclor
Reflection coefficient
When using two points or one point to measure, the coefficient of the measured value is used to compensate for the measured value. In theory, it is the limit of the measured value and the true value. It limits the value of the measured value.
4 Codes for measurement methods
4-point method:
One-point method
One-page method:
Effective measurement
Fixed viewing angle is written after or after the measuring angle is written after a slash. Example: represents the three-point measurement method, =
3120\ represents the symmetrical one-point method, 120\; 3550/30 represents the non-symmetrical three-point measurement m=60% over=30%. 5. Measurement method
The measurement method is related to whether the required data has been measured. There is a difference between the actual reading value (i.e. the gain value) and the actual reading value. It is necessary to make corrections according to the method to obtain the actual measurement difference. 5. The measured value is directly in Table 2. The device with a larger anti-fading coefficient F is sent in Table 2. The parts to be weighed are placed in the measuring device and adjusted. Read the value of the display, and use the corresponding correction coefficient to calculate the actual roundness value:
——actual reading error value
measured value, that is, the reading value of the display: the correction coefficient Www.bzxZ.net
B/T4380—2004
The effect of the parts, the measurement can not accurately get the part's supply error: the three points should be combined 5.2
The combination of Table 1
Use Table 3, Table 4, take the maximum value of each measurement value, and use the corresponding average error coefficient to calculate the error value.
Wu Zhong:
The maximum value of each measurement!
Strict and reflection coefficient,
Table 1 Reflection coefficient F of mass spectrometry
Network or method
3S158*
Liu Huanhuiye
............ 2
Non-time measurement
3s120/
ss6c36
Two points
Table 2 Reflection coefficient F of Lai measurement
Time measurement
GBT 438C—2004
GB/T 4380—2004
Jingbancheng
Too average
Just stir-fry
-33: 9
Haozhong accommodation display service
6Quantity recording and equipment
6.1 Static pressure of the probe
GR/I 4380—2J04
The static pressure of the probe should be less than N. Under the premise of ensuring that the probe screen is always in continuous contact with the surface to be measured, the pressure difference should be minimized to avoid measurement errors caused by this
6. 2 Probes The size and shape of the probes shall be determined according to the shape and size of the surface to be measured. Table 5 Probe size and shape Measuring the outer surface of shafts External openings In general, internal cutting edges Measuring the diameter of the shaft All diameters Note 1: This type of probe is only for the outer surface of shafts or external openings, and can also be used for surface probes. Method 2 If the probe size and shape are required, they shall be specified in the special specifications. 6.3 Fixed bearings Units are in meters Half and shape of the auxiliary probe R2. E Figure 1 Rc. National Society R2. E country ±
Suitable for measuring and supporting the bottom to use point or line to find the swelling type: For the measurement of the entire outer surface of the shaft, a small radius ball or short round support is also used. A narrow V-type support is used. For the measurement of the inside of a hole, a small half-grid ball support is used. The fixed support center distance of the surface measurement is: L = (u-) × c08
The fixed support center distance of the internal surface measurement area is: In = (L
In the formula:
The diameter of the intercept measurement is:
The diameter of the ball (or blade) support;
The fixed measurement support comes from.
As shown in the figure,
CB/I 4380——7C04
Appendix A
(Informative list)
Examples of the use of two-point and three-point methods
GB/T4380—204
A. 1 The detection is relatively complete. The return column lead is 3. The illumination tolerance is 7 km. The measurement area is H 3365°. The measured value is: 418rm
A.1.1 Calculation of the error value
A.1.1.1 The table 1 can be used to directly check the reverse throat system: When =3, the reverse coefficient of the 3S60 term is F=3
: The formula 11 can be used to obtain the reading column hole error: 4
1.1.1.2 If it is only necessary to determine whether the part is within the given tolerance range without having to find out the two error values ​​of the part, it can be directly used to evaluate the performance;
For this example,
the part is unqualified
1 F7×1 = 21 μm
Therefore, the flow mist is applied,
A2 inspection of the zero production of the grinding of the grinding mill, the number of connections is an odd number: and] the given degree tolerance is 4[m, the urine method is selected as one or \\+\ to measure the signal
low island will
A.2.1 Figure sound error value and calculation
1S60\/33'
4, 5 vss
day table 4 can be obtained for the non-matching early reflection coefficient, when 321, 3330°: 30\cheng A, 2.1.1
3S1\/6n-3S90\> The average reflection coefficient is 2
+ (2) The network temperature difference of the engine can be obtained: =
A. 2. 1. 2
5.2-2.5am
As with the above test, only the new parts with the same specifications can be purchased and sold from the market. The parts are qualified:
For this example,
The parts are qualified
2f.. -.1x2= 8μm.
Amx - 5. 2 μm ~ : F.
The parts are qualified.
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