This standard specifies the definition, type, basic parameters and dimensions, technical requirements, test methods, marking, packaging and transportation requirements of the spring-type internal diameter micrometer. This standard is applicable to spring-type internal diameter micrometers with a graduation value of 0.01 mm and a measuring range of 3 to 20 mm. JB/T 8791-1998 Spring-type internal diameter micrometer JB/T8791-1998 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 87911998
Spring-loaded internal diameter dial indicator
1998-07-17 Issued
China Machinery Industry Bureau
1998-12-1 Implementation
JB/T8791-1998
This standard is formulated after the revision of 2BJ42C21-8 spring-loaded internal diameter dial indicator: According to the development of production and technology, the original standard has been revised as follows:
The definition of spring-loaded internal diameter percentage indicator has been revised; The working stroke of the spring-loaded probe has been changed to the measurement stroke of the probe, and the content has also been changed accordingly; The internal deviation of 2.2 in the original standard has been removed;
Product quality The specification of the original standard table 2A is changed from 2~20mm to 3--20. The measuring depth, nominal size and stroke are changed. The standard table 4 is changed accordingly according to the standard requirements. The non-standard content of this standard is removed from Appendix A of the original standard and will be replaced by ZBJ4328 at the same time as the main text of the standard. This standard is proposed by the National Technical Committee for Standardization of Measuring Instruments. Drafting unit: Suzhou Changfeng Instrument Co., Ltd., its head factory, Erguan Yuezhi Blade Factory, Beijing Instrument Co., Ltd. ... All international standards are subject to revision. Therefore, the parties using this standard shall explore the applicability of the latest versions of the following standards. ZBY3 Positioner Packaging Technical Requirements
3.1 The vertical displacement of the measuring head shall be converted into the displacement of the pointer of the dial indicator, and the measuring head shall be read effectively.
2 The measuring head is within the range of the actual range
3.3 The total error of the indication
The difference between the high point and the low point on the vertical scale on the indication tracking error curve obtained in the process of the adjustment. 3.4 The difference between the two adjacent inspection points on the indication straight line 1 is the difference between the vertical scale and the vertical scale. 3.5 Indication variability
When the measuring head is extended and the conditions are not changed, the same measurement is repeated and the indication changes by six values:
4 Type, basic parameters and size
1.1 For the type of measuring head or inner diameter, see Figure 1. This figure is only for illustration and does not represent the detailed structure. 12 Measurement depth and source of inner diameter meter Head recording installation 1 mining
He most flower field
minus the amount (min)
recognize the chaos depth (m.1
National Hangzhou City Industrial Bureau 19980717 approved
-9-~29
1998-12-implementedwww.bzxz.net
5 technical requirements
percentage
there is a sea source
JB/T 8791
5.1 The surfaces of the internal diameter micrometer of the expansion type shall not have any external defects that may affect the performance. 5.2 The measuring mechanism of the internal diameter micrometer of the expansion type shall move smoothly and flexibly without sticking and twiddling when in use. 5.3 The total error, relative error and indication variability of the internal diameter micrometer of the expansion type shall not exceed the requirements of Table 2. 2
Probe measurement
3-, r-:. 2
Total indication adjustment
5.4 The spring type internal diameter micrometer shall not exceed the requirements of Table 3: Table 2
Relative error
4 -- 1C
Low certification
1>--26
IB/TB791.1998
S.5 Leakage width measurement The hardness of the measuring surface is not less than 766HV(62HRC>: The thickness of the yellow probe made of stainless steel is not more than 551HV(=>2.HRC
5 The general probe must be measured and the total accuracy of the table is R,C.10m, 6 test method
6.1 External gram
Day and its appearance can meet 5.1 Requirements, the interaction between the two should be in accordance with the requirements of 5.2. 6.3 The total reading error, the corresponding error volume
6.3.1 Test adjustment
The test micrometer is fixed on the measuring surface and connected to the measuring surface. The measuring head should be between the two measuring instruments, see Figure 2.
, turn the micrometer head to the starting point of the two heads, and adjust the percentage to the right. After the measuring head is changed to isobaric, the measuring upper limit is not less than 0.c5mr (0.0mA) or the measuring limit is not less than 4rm) when the measuring head reaches the measuring end point. Draw the error curve of the indication value according to the six values ​​of each test point, see Figure 3: Figure 2
en, I rnf
Also the total amount of measurement of the sub-
special equipment
indication error curve is the main inner difference between the high and low points of the product on the coordinates, that is, the total indication error: the indication error line is the difference between the two adjacent inspection points in the vertical step is the relative error
.18/T 87911999
Each set of yellow or inner diameter micrometer! Take a spring-loaded probe and calibrate it according to the above method. Only check the starting point and the end point of the spring-loaded probe to determine the total error of its indication. 3.2 Check these 1 month
Use or special inspection tools, the maximum allowable value of the uncertainty width H is 26.4 Caution variability
6.4.1 Test operation
Put the expansion type internal diameter micrometer into the calibration gauge; move and rotate the expansion type internal diameter micrometer. Find its turning point and then read the main white scale: let the operation process be repeated 5 times at the same position of the calibration ring gauge, and take the 5 readings that are the closest to the same 6.4.2 Inspection tool
calibration ring, the maximum tolerance of the side meter is 0.6.5 force
6.5.1 Test method
Install the expansion type diameter dial gauge on the sub-meter, so that the head and the measuring meter are connected, and then compress the expansion meter to get the measuring bucket reading at the starting point of the measuring head or the measuring meter. 6.5.2 According to the age tool
sensitivity and the maximum allowable value of the measuring meter is Q.2N, 6.6 Surface material
Use the fabric stability comparison to compare the leather for comparison. If there is any dispute, adjust the surface tension inspection. 7 Marking and packaging
7. The expansion type internal diameter percentage gauge should be marked with:
a) manufacturer's name or registered trademark:
h graduation value:
) product serial number
7.2 The yellow plate should have a mark indicating the measuring range. 7.3 The packaging of the general internal diameter percentage gauge should be marked with:
manufacturer's name or registered trademark, address: product name:
scope of compliance:
d external pressure:
! The measuring range of the internal diameter percentage gauge should be marked on the packaging of the manufacturer. 7.4 The expansion type internal diameter percentage gauge should be rust-proofed before packaging. The packaging should not be damaged in accordance with the provisions of 2BY03 and should not be damaged.
.5 The inner diameter of the dining table is divided into two parts. The product certificate should be in accordance with the international standards. The product market number and export plan should be in accordance with the product certificate of this standard.
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