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GB/T 1216-2018 English PDF (GBT1216-2018)

GB/T 1216-2018 English PDF (GBT1216-2018)

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GB/T 1216-2018: External micrometer

This Standard specifies the terms and definitions, types and basic parameters, requirements, inspection methods, marking and packaging of external micrometer (excluding electronic digital display external micrometer). This Standard applies to external micrometers with division values of 0.01 mm, 0.001 mm, 0.002 mm and upper limit of measurement range up to 1000 mm (excluding electronic digital display external micrometer).
GB/T 1216-2018
External micrometer
ICS 17.040.30
J42
National Standards of People's Republic of China
Replace GB/T 1216-2004
Outside diameter micrometer
Published on.2018-05-14
2018-12-01 implementation
State market supervision and administration
China National Standardization Administration issued
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 1216-2004 "outer diameter micrometer". This standard is compared with GB/T 1216-2004, except for editorial modifications. In addition, the main technical changes are as follows.
--- Scope of application removed the outer diameter micrometer with a graduation value of 0.005mm (see Chapter 1, Chapter 1 of the.2004 edition); --- Modified the definition of the outer diameter micrometer (see 3.1, 3.1 of the.2004 edition); --- Increased the type of outer diameter micrometer (see 4.1.1);
--- Increased the type and description of the outer diameter micrometer reading device (see 4.1.2); --- Modified the basic parameters of the outer diameter micrometer (see 4.2,.2004 version 4.2); --- Modified the deformation requirements of the ruler (see 5.3.1, 5.3.1 of the.2004 edition); ---Modified the technical requirements for micrometer screw and anvil (see 5.4,.2004 edition 5.4); --- Revised the technical requirements for interaction (see 5.5, 5.5 and Appendix A of the.2004 edition); ---Modify the "force measuring device" as "locking device" (see 5.6, 5.6 of the.2004 edition); ---Modify "ratchet" as "force measuring device" (see 5.7, 5.7 of.2004 edition); ---Modified the technical requirements of the measuring surface, deleted the appendix "measuring surface deviation value", the corresponding content is placed in the text (see 5.8,.2004 edition) 5.8 and Appendix B);
---Modified the ruler spacing technical requirements (see 5.9.1,.2004 version 5.9.1); --- Increased the outer diameter micrometer score line coincidence requirement of the graduation value of 0.001mm (see 5.9.5); ---Modified "digital display device" as "counter digital reading device" and modified the corresponding requirements (see 5.10,.2004 edition) 5.10);
--- Revised the technical requirements for the maximum allowable error (see 5.11, 5.11 of the.2004 edition); --- Revised the technical requirements for proofreading gauges (see 5.12, 5.12 of the.2004 edition); --- Modified the inspection requirements of the interaction, deleted the appendix "axial yaw and radial oscillating", the corresponding content is placed in the text (see 6.4, Version 6.4 and Appendix A of the.2004 edition;
---Modified the measurement error of the measurement surface error (see 6.6, 6.6 of.2004 edition); --- Revised the inspection requirements for the indication error of the outer diameter micrometer (see 6.7, 6.7 of the.2004 edition). This standard was proposed by the China Machinery Industry Federation.
This standard is under the jurisdiction of the National Standardization Technical Committee for Measuring Instruments (SAC/TC132). This standard is drafted by. Chengdu Tool Research Institute Co., Ltd.
Participated in the drafting of this standard. Suzhou McLong Measuring Technology Co., Ltd., Guilin Measuring Tool Limited Liability Company, Chengdu Massing Tool Group Co., Ltd., Harbin Measuring and Cutting Tool Group Co., Ltd., Guilin Guanglu Digital Measurement & Control Co., Ltd., Guangxi Zhuang Autonomous Region Testing Institute, Liaoning Institute of Metrology.
The main drafters of this standard. Xu Gang, Jiang Zhigang, Huang Xiaobin, Wei Gaihong, Luo Weibing, Zhang Wei, Dong Zhongxin, Chen Ping, Ding Wen. The previous versions of the standards replaced by this standard are.
---GB/T 1216-1975, GB/T 1216-1985, GB/T 1216-2004.
Outside diameter micrometer
1 Scope
This standard specifies the terms and definitions, types and basic parameters, requirements, and external diameter micrometers (excluding electronic digital display outer diameter micrometers). Inspection methods and signs and packaging.
This standard applies to outer diameter micrometers with graduation values of 0.01mm, 0.001mm, 0.002mm and upper limit of measurement range up to 1000mm. (Does not include electronic digital display outer diameter micrometer). 2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 1800.2-2009 Geometrical Product Specifications (GPS) Limits and fits. Part 2. Standard tolerance classes and Limit deviation table
GB/T 17163-2008 Geometric quantity measuring instrument terminology basic terminology GB/T 17164-2008 Geometric quantity measuring instrument terminology product terminology 3 Terms and definitions
The following terms and definitions as defined in GB/T 17163-2008 and GB/T 17164-2008 apply to this document. 3.1
Using the screw pair to convert the rotation angle of the micrometer screw into the axial displacement of the micrometer screw, and the distance between the two measuring surfaces on the scale frame An external measuring device that performs readings.
Note. Rewrite GB/T 17164-2008, definition 2.3.2.
3.2
Micrometer maximum allowable error maximumpermissibleerrorofmeasuringhead The influence of the anvil and the ruler is neglected, and only the maximum allowable error of the indication of the micrometer is specified. 4 type and basic parameters
4.1 type
4.1.1 Outer diameter micrometer main type
The type of the outer diameter micrometer is shown in Figure 1, and the illustration is for illustration purposes only. The anvil of the outer diameter micrometer can be made fixed, replaceable or adjustable (or movable). The outer diameter micrometer readings have analog scale readings and counter digital readings. The outer diameter micrometer should be equipped with a zero adjustment tool. The outer diameter micrometer of the lower limit of the measurement range greater than or equal to 25mm should be accompanied by proofreading. Measuring rod.
a) Fixed anvil fixed micrometer
b) Anvil can be replaced with an outer diameter micrometer
Figure 1 Schematic diagram of the outer diameter micrometer
c) Anvil can adjust the position (or movable) outer diameter micrometer Description.
1---measurement surface;
2---anvil;
3---micrometer screw;
4---foot frame;
5---insulation device;
6---locking device;
7---fixed casing;
8 --- baseline;
9 --- ruler analog reading device;
10---microtube;
11---force measuring device;
12---counter digital reading device;
13---replaceable anvil;
14---Adjustable position (or movable) anvil.
Figure 1 (continued)
4.1.2 Outside diameter micrometer reading device
4.1.2.1 Analog scale reading device
The analog scale reading device is shown in Figures 2 and 3.
Description.
1---main ruler;
2---sub-scale.
Note. The reading in the figure is 35.04mm.
Figure 2 Analog scale reading device (the pitch of the micro screw is 0.5mm, the graduation value is 0.01mm) Description.
1---main ruler;
2---sub-scale;
3--- vernier ruler.
Note. The reading in the figure is 5.005mm.
Figure 3 Analog scale reading device (the pitch of the micro screw is 0.5mm, the graduation value is 0.001mm) 4.1.2.2 Counter digital reading device
The counter digital reading device is shown in Figure 4.
Description.
1---Counter digital reading device.
Figure 4 counter digital reading device
4.2 Basic parameters
The basic dimensions of the outer diameter micrometer are shown in Figure 5 and Table 1. The lower limit of the measurement range of the outer diameter micrometer is preferably 0, or an integral multiple of the range. Figure 5 Basic dimensions of the outer diameter micrometer
Table 1 Basic dimensions are in millimeters
Basic size nominal value
The nominal diameter of the portion of the micrometer screw and the anvil that protrudes from the frame, D1a 5, 6.35, 6.5, 7.5, 8.0 The length of the anvil is extended by the frame, L1 ??? 3
Measuring the length of the micro screw protruding from the frame at the upper limit of the measuring range, L2 ??? 3 Upper limit of measuring range of outer diameter micrometer, L3 ???1000
The range of the outer diameter micrometer, L4a 13,15,25,50
Ruler depth, L5 ??? 0.5 ?? L3
The outer diameter micrometer micrometer screw pitch a 0.5,1
a Manufacturer may choose other parameters.
5 requirements
5.1 Appearance
The outer diameter micrometer should not have defects such as rust, bumps, scratches, cracks, etc. that affect the performance. 5.2 Materials
5.2.1 The ruler should be made of steel, malleable cast iron or other similar properties. 5.2.2 The micrometer screw and the anvil should be made of alloy tool steel, stainless steel or other similar properties; the measuring surface should be made of hard alloy. Or other wear resistant materials.
5.3 ruler
5.3.1 The ruler should have sufficient rigidity. When the ruler acts 10N along the axis of the micrometer screw, the deformation should not be greater than The provisions of Table 2.
5.3.2 Thermal insulation shall be installed on the ruler.
Table 2 shows the maximum allowable error, parallelism tolerance and deformation of the frame when subjected to 10N force Measuring range
Mm
The maximum allowable error parallelism tolerance is the amount of deformation when the frame is subjected to 10N force Mm
0~15,0~25
25~50
50~75,75~100
100~125, 125~150
150~175,175~200
200~225, 225~250
250~275, 275~300
4(2)a
5(3)a
2(1)a
2(1.5)a
3(2)a
Table 2 (continued)
Measuring range
Mm
The maximum allowable error parallelism tolerance is the amount of deformation when the frame is subjected to 10N force Mm
300~325,325~350 10 5 8
350~375, 375~400 11 6 9
400~425,425~450 12 6 10
450~475, 475~500 13 7 11
500~600 14 9 12
600~700 16 11 14
700~800 18 13 16
800~900 20 15 18
900~1000 22 17 20
a The value in parentheses ( ) is the corresponding requirement for the outer diameter micrometer with a graduation value of 0.001 mm. 5.4 Micrometer screw and anvil
5.4.1 The nominal diameter D1 of the smooth cylindrical part of the micrometer screw and the anvil that protrudes out of the frame is shown in Table 1. 5.4.2 Replaceable anvils The length of the extension of the ruler should be equal to the integral of the range or range of the outer diameter micrometer. 5.4.3 The adjustable position (or movable) of the anvil shall be extended to the range of the outer diameter micrometer after the position adjustment is adjusted to be equal to the range or amount of the outer diameter micrometer. An integer multiple of the process.
5.5 Interaction
5.5.1 The micrometer screw and nut should be fully meshed within the full range, and the fit should be good. There should be no jamming and obvious axial turbulence. The axial turbulence value should preferably be no more than 0.01 mm.
5.5.2 The fit between the smooth cylindrical part of the micrometer screw and the sleeve of the micrometer screw should be good, and there should be no obvious radial oscillation. Radial The swing value should preferably be no more than 0.01 mm.
5.6 locking device
The outer diameter micrometer locking device should effectively lock the micrometer screw. Before and after locking, the distance between the two measuring surfaces should not change more than 2??m. And the parallelism between the two measuring surfaces shall comply with the provisions of 5.8.2. 5.7 Force measuring device
The measuring force and the measuring force of the measuring surface in contact with the spherical surface shall be changed by the force measuring device to move the micrometer screw to meet the requirements of Table 3. Table 3 Measurement force, measurement force change
Measuring range
Mm
Measuring force measurement force change
0~500 5~10
>500~1000 8~12
5.8 Measuring surface
5.8.1 The edge of the measuring surface shall be blunt and its flatness shall not exceed 0.6 ??m. The surface roughness of the cemented carbide measuring surface should not be greater than Ra 0.04 ??m; the surface roughness of the alloy tool steel and stainless steel measuring surface should not be greater than Ra 0.1 ??m. 5.8.2 Within the specified measuring force range, the parallelism error of the two measuring surfaces of the fixed outer diameter fixed micrometer shall not exceed the requirements of Table 2; The anvil can be replaced and the anvil can be adjusted (or movable). The parallelism error of the outer diameter micrometer should not be greater than the maximum measurement range. The value of Table 2 was increased by 1 ??m.
5.8.3 The hardness of the measuring surface of the alloy tool steel shall not be less than 740HV (or 61.8HRC); the hardness of the stainless steel measuring surface shall not be less than 552HV (or 52.5HRC).
5.8.4 There should be no obvious deviation between the two measuring surfaces of the outer diameter micrometer, and the deviation error should not be greater than that specified in Table 4. Table 4 Deviation error unit is mm
Measuring range upper limit error
25 0.05
50 0.10
75 0.15
100 0.20
125 0.25
150 0.30
175 0.35
Measuring range upper limit error
200 0.40
>200~250 0.50
>250~300 0.60
>300~400 0.80
>400~600 1.20
>600~800 1.60
>800~1000 2.00
5.9 ruler
5.9.1 There should be 50 or 100 equally spaced scales on the differential cylinder. The spacing between the scales should not be less than 0.8mm. The width of the scale marking should be Between 0.08mm and 0.20mm.
5.9.2 The angle of the conical surface of the differential cylinder should be between 7 ?? and 20 ??, and the distance from the edge of the conical surface of the differential cylinder to the surface of the fixed sleeve should not be large. At 0.4mm.
5.9.3 The scale marking on the fixed sleeve and the scale marking on the differential cylinder should be clear, and the difference in width should not exceed 0.03 mm. 5.9.4 When the outer diameter micrometer is at the zero position, the distance from the end edge of the conical surface of the differential cylinder to the fixed casing scale mark, the allowable pressure line is not greater than 0.05mm, offline is not more than 0.10mm.
5.9.5 The zero-point line and the tail-cut line of the outer diameter micrometer vernier of the graduation value of 0.001 mm should be no more than the corresponding line of the sub-scale. 0.005mm.
5.10 counter digital reading device
When moving the micrometer screw of the outer diameter micrometer of the counter, the counter should be carried in order, no disorder display phenomenon; remove the tail code, other numbers The center of the code should be on the same line parallel to the axis of the micrometer screw when it is not in place. Counter reading value with a resolution of 0.002mm The difference between the analog scale indication values should be no more than 3??m. 5.11 Maximum allowable error of indication
The maximum allowable error of the indication of the zero point (ie floating zero) of the outer diameter micrometer at any position within the measurement range shall not be greater than that of Table 2. Provisions.
The maximum allowable error of the micrometer of the outer diameter micrometer shall not exceed the requirements of Table 5. Table 5 Maximum allowable error of micrometer
Measuring range
Mm
Micrometer maximum allowable error
Mm
0~15,0~25 3(2)a
25~50 5
a The value in parentheses ( ) is the corresponding requirement for the outer diameter micrometer with a graduation value of 0.001 mm. 5.12 proofreading rod
5.12.1 The deviation of the outer diameter micrometer proofing rod of the measuring range not more than 500mm shall not exceed the GB/T 1800.2-2009 The specified js2, the outer diameter micrometer proofing rod with a measuring range greater than 500mm shall not be larger than the GB/T 1800.2-2009. The prescribed js3.
5.12.2 The calibration surface hardness of the measuring rod should not be less than 740HV (or 61.8HRC); the hardness of the stainless steel measuring surface should not be less than 552HV (or 52.5HRC).
5.12.3 The proofing rod shall have insulation.
6 Test methods
6.1 Scale deformation
Fix the end of the ruler to measure the anvil, apply 100N force to the end of the micro-screw of the ruler, and observe the force under the applied and unstressed conditions respectively. The generated indication value is converted into a ratio of 10N force by the difference between the secondary indication values, and the amount of deformation of the frame is obtained. 6.2 Measuring plane flatness
When using 2-level optical flat crystal inspection, the optical flat crystal should be adjusted so that the number of interference bands or interference rings on the measuring surface is as small as possible, or A closed interference ring is produced, and two or more interference rings or interference bands of the same color should not appear on the measurement surface. The flatness within 0.4 mm from the edge of the measuring surface is ignored. 6.3 Parallelism of the measuring surface
The outer diameter of the measuring range is not more than 100mm. The parallelism of the two measuring surfaces should be three or four, and the thickness is poor. An optical parallel flat crystal approximately equivalent to 1/3 or 1/4 of the pitch of the micrometer screw is tested; the optical parallel flat crystals are sequentially placed into two measurements Face, turn the force measuring device, apply a force of 5N~10N, make the optical parallel flat crystal and the measuring surface contact, and gently rotate the flat crystal to make two measurements The number of interference rings or interference bands present on the measuring surface is minimized. The parallelism of the outer diameter micrometer measuring surface can also be checked with other instruments (such as a self-collimator). Parallelism in the range of 0.4 mm from the edge of the measuring surface is ignored. 6.4 Interaction
Under normal circumstances, the interaction is checked by hand, and the hand feel must not have obvious axial turbulence and radial oscillation; if there is any objection, the following can be Method test.
Check the axial yaw with a lever indicator with a resolution of not less than 0.001 mm. Connect the lever indicator to the micrometer screw when testing. At the touch, a force of 3N~5N is applied back and forth along the axial direction of the micrometer screw, and the change of the indication value of the indication table is the axial turbulence of the micrometer screw. Check the radial swing with a lever indicator with a resolution of not less than 0.001 mm. When testing, the micro screw is extended by 10 mm to make the bar. The rod indicating table contacts the end of the diameter of the micrometer screw, and applies a force of 2N~3N to the measuring direction of the lever indicator on the micrometer screw, The change in the display value is the amount of radial swing of the micrometer screw in this direction. The test of radial oscillation should be in two mutually perpendicular directions In the row, the maximum value obtained by taking the test twice is the radial swing amount of the micro screw. 6.5 hardness
For measuring surfaces without cemented carbide or other wear-resistant materials, a smooth cylindrical part of 1 mm from the measuring surface or from the measuring surface Inspection.
For measuring surfaces with cemented carbide or other wear-resistant materials, the hardness can be checked. 6.6 Measuring surface deviation
Under normal circumstances, the two measuring surfaces of the outer diameter micrometer should not be obviously deflected by eyesight; if there is any objection, it can be tested as follows. The deviation of the two measuring faces is checked with a indicating table having a resolution of not less than 0.01 mm or a height caliper. When testing, first measure the outer diameter micrometer The micro-screw is adjusted to the maximum range, and then the ruler is placed flat on the three adjustable support frames on the flat plate, and the support frame is adjusted to extend the micrometer screw The axis is parallel to the plane of the plate, and the distance between the micrometer screw and the anvil to the flat plane is measured respectively. The difference between the two distances is that the two measuring surfaces are horizontal. The offset of the direction; then, the scale is rotated 90?? around the axis of the micrometer screw, so that the plane of the ruler is perpendicular to the plane of the plane, and the frame is used as a support point. Tune The whole support point makes the axis of the extension part of the micrometer screw parallel to the plane of the flat plate, and respectively measures the distance between the micrometer screw and the anvil to the flat plane, two distances The difference between the two is the offset of the two measuring faces in the vertical direction; the maximum value obtained by the two tests is the offset of the two measuring faces. 6.7 indication error
6.7.1 Fasten the outer diameter micrometer to the fixture and place the dimension series between the two measuring surfaces. A 2.5mm, A 5.1mm, A 7.7mm, A 10.3mm, A 12.9mm, A 15mm, A 17.6mm, A 20.2mm, A 22.8mm and
A 25mm or size series. A 5.12mm, A 10.24mm, A 15.36mm, A 21.5mm, A 25mm The level 2 precision gauge block is checked (A is to achieve the lower limit of the measurement range). Measure the deviation of the outer diameter micrometer indicator value from the size of each gauge block. The deviation of each point of the connection is plotted as a curve, and the absolute value of the difference between the coordinates of the highest point and the lowest point on the ordinate is the indication of the outer diameter micrometer. See Figure 6 for the error.
Description.
L---length;
J---error;
h---indicator error;
c---maximum allowable error limit;
a---error curve.
Figure 6 Example of the indication error curve
6.7.2 The outer diameter micrometer of different measurement ranges shall be inspected by a special gauge block adapted to its measurement range. Determining the indication error The same law 6.7.1.
6.7.3 For the outer diameter micrometer with a measuring range greater than 100 mm, the installation of the spherical auxiliary anvil shall start from 0 mm, the maximum allowable error The difference is in accordance with the maximum allowable error of the micrometer; or the outer diameter micrometer dedicated gauge is sequentially tested on a gauge block corresponding to the lower limit of the measurement range. The method of determining the indication error is the same as 6.7.1.
7 signs and packaging
7.1 The outer diameter micrometer shall be marked with.
a) manufacturer's name or trademark;
b) the division value or resolution;
c) measurement range;
d) Product serial number.
7.2 The proof gauge shall be marked with its nominal length.
7.3 The outer diameter micrometer box should be marked with.
a) manufacturer's name or trademark;
b) product name;
c) measurement range;
d) Grading value or resolution.
7.4 The outer diameter micrometer should be rust-proofed and properly packaged before packaging, and the product should not be damaged during transportation due to poor packaging. 7.5 The outer diameter micrometer shall be accompanied by the product certificate when it meets the requirements of this standard. The product certificate shall be marked with the standard number of this standard. Product serial number and date of manufacture.

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