Some standard content:
National Metrology Verification Regulations of the People's Republic of China JJG 117—2005
Surface Platey
2005-03-03 Issued
20050903 Actual
The General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China issued JJG 117——2005
Verificationtegulation of
Surface Plates
JJG 117—205
Replaces JJG 117—1991
The regulations were approved by the General Administration of Quality Supervision, Inspection and Quarantine on March 3, 2005 The project was approved and implemented on September 3, 2005. The main drafting unit: National Technical Committee for Geometry Engineering Reference Standards. The main drafting unit: Beijing Institute of Metrology. Shandong Provincial Measurement and Testing Institute. The drafting unit: Qingdao Shangshao Precision Machinery Co., Ltd. This regulation is entrusted to the National Technical Committee for Geometry Engineering Reference Standards to be responsible for the interpretation of this regulation. The main drafters: Liu Zhenfu, Ma Guiru, Xu Qingji. ||Mengjia Drafting person:
Zhang Wuting
.IFG117—2005
(Beijing Metrology Science Institute)
(Beijing Metrology Science Institute)
Shandong Province Rangshixun Research Institute)
(Beijing Metrology Science Institute)
(Qingdao Qianjing'an Machinery Company)
2 References·
Overview,
4 Meter performance requirements
4.1 Maximum allowable deviation of working surface flatness
JJG17—2005
4.2 Uncertainty of working surface flatness measurement results4.3 Variation of repeated measurements:
Flatness of barrel working surface…
4.5 Surface roughness
4.6 Angle of surface..
5 General technical requirements
5.2 Surface quality
6 Control of measuring instruments
6.1 Verification conditions,
Verification item
Verification method
6.4 Processing of verification results
6.5 Verification cycle
Appendix A
Example of data processing for flatness pressure measurement of flat working surface Appendix B
Plane fluctuation single gauge
Appendix Evaluation of uncertainty of flatness measurement results of flat working surface Appendix" Format of the inner page of verification certificate and verification result notification (1)
1 Scope
JJG 117-2005
Verification Procedure for Flat Plates
This procedure is applicable to the initial verification, subsequent verification and in-service inspection of iron flat plates and rock flat plates. 2 References
This procedure refers to the following documents:
JF1001—1998 Terms and Definitions for General Counter Plates JJF1005—1999 Determination and Expression of Uncertainty in Measurement IJF1094—2002 Evaluation of Characteristics of Measuring Instruments JB/T7974—1999 Cast Iron Half Plates
JB/T7975—1999
Rock Flat Plates
When using this procedure, attention should be paid to the use of the currently valid versions of the above-mentioned references. 3 Overview
Flat plate displays are measuring instruments used for inspection or marking of parts. According to the material, the flat plate is divided into cast plate and rock plate; according to the structural type, the iron plate is divided into ribbed type and box type, see (u) and (b) in Figure 1, and the rock plate is divided into edged and edgeless, see (e) and (d) in the figure. According to the accuracy level, the flat plate is divided into level 00, level 1, level 1, level 2 and level 3. Level 2 and above are inspection plates, and level 3 are marking plates.
4 Metrological performance requirements
4.1 Maximum allowable error of half-surfaceness of working surface
The maximum allowable error of the flatness of the working surface of the flat plate is as specified in the rate 1. The surface can be ignored within the distance specified in Table 2, and any point in the month shall not be higher than the working surface. 4.2 Uncertainty of the measurement result of the flatness of the working surface The uncertainty of the measurement result of the flatness of the working surface shall meet the requirements of formula (1). 1
Where: —Uncertainty of the flatness measurement result, m: F. —Maximum allowable error of the flatness of the flat plate, ur. 4.3 Repeated measurement of displayed changes in pressure
Abandon the flip measurement and repeated measurement of displayed changes in pressure should meet the requirements of formula (2). 4.sr
Wherein: 4, each section measuring point is perpendicular to the midpoint of the diagonal and is measured repeatedly even if the disk changes, ()
Non-machined surface
Second part surface
(day) Turnable iron plate
Working drawing
[e Convex rock flat plate
JG 1.17—20 Appendix 5
Precision structure diagram of the flat plate
The maximum allowable error of the flat work flatness, a
4.4 Flatness of high part L work surface
(b) Standard outer iron plate
(d) Polished convex rock flat plate
4.41 The flatness of the work surface of the morning part 1 refers to the surface flatness of the flat plate working surface within the range of 30mm×3. When the diagonal length of the flat plate is 566mm, the surface flatness of its local working surface should be measured. 4.4.2 The maximum allowable error of the flatness of the local working surface is specified in Table 1. The flatness of the kitchen working surface can also be determined by the plane fluctuation. The plane fluctuation amount of the working surface is specified in Table 3. 4.4.3 In addition to meeting the requirements of 4.4.2, the local flatness of the scraped cast iron plate shall also meet the requirements of the number of contact points, see Table 4.
When there is a dispute over the measurement results of the number of butt joint points, the contact point surface ratio shall be measured and used as the measurement result. It shall comply with the provisions of Table 4.
In the range specified in Table 2, the effective contact point contact surface ratio may not be calculated. Any point shall not be higher than 1 working surface
(x: m
160×100
200×100
24×2KJ
25> tG
250×: 250
300×200
200×250
410× 300
400×44k)
6U x450
6.30 × 630
800×80m
1000×750
1250 09
1609×x
16J ×1601
200×15
2509 x1600
117—2005
The maximum allowable error of the three sides of the flat working surface
Heisei cruise ship level
Pingshang this most artificial detailed medical care
Method in the flatness is lacking and is designed to be adjusted and suffers from 20 Huicheng law white flat and as usual large heart reduction will be implemented:
1ocogrr
0 line: 4:
2 8:15 ×
Ta/pan
3 load: 40×11+:
calibration. point,
Chengzhong:
+inorJam
Plate specification
400x400
（400×±00:
JJG L172005
Table 3 Flat plate working surface edge screw distance
(1600)×t600
> 1600×1600
Single flat plate working surface edge
Table 3 Flat plate working surface plane fluctuation plate
Semi-reflection accuracy level
1. Flat surface passive projection
Scrape casting Flat plate working surface collision point number and area ratio Flat plate accuracy period
25 The number of contact points in an area of mm×25 mm The difference in the number of contact points in two areas of 25 mm*25 mm The ratio of the contact points per unit area The difference in the ratio of the contact points per unit area 4.5 Surface roughness 16% 10% 4.5.1 The surface roughness of the working surface and the side surface of the non-scraped cast iron flat plate is as specified in Table 5. Table 5 Surface roughness (R) of the working surface and the side surface of the non-scraped cast iron flat plate Working surface Flat plate size: 400 mm×4 (mm> 400 mm×400) 4.5.2 Surface roughness R of the working surface of the flat plate: 6.3 μm 4.6 Side angle Flat work angle (0.4~0.The surface roughness of the side surface is m, the surface roughness R of the side surface, and the angle between the working surface and the surface surface is within 10. 5 General technical requirements
5.1 Appearance
The first plate to be moved should have the measurement unit (factory mark), product name, specification, grade, and other marks. The flat plate has three main supports, and the position of the support points conforms to the principle of minimum deformation. One section is taken at 2/94 of the side length of the plate. Plates with a size greater than 1000mm×1000mm should add auxiliary support points. 5.2 Surface material 5.2.1 The working surface of the cast iron plate should not have defects such as cracks, scratches, scratches, rust, and loose materials: the subsequent inspection of the cast iron plate working surface is allowed to have defects that do not affect the performance of the cast iron plate. The cast iron plate that meets the above test requirements should eliminate the molding sand and be flat, without sharp edge burrs, and no smear. The working surface L of the cast iron plate with a diameter of less than 1Smm is allowed to be blocked with the same material, and its hardness should be lower than the hardness of the surrounding material. The number of sand holes blocked on the working surface should be no more than 4, and the distance between the sand holes should not be less than mm. The cast iron plate should be non-magnetic:
5.2.2 The working surface F of the rock plate should not have defects such as scratches, bumps, burns, pits, loose materials, etc. The above defects that do not affect the performance of the rock plate working surface are allowed to be subsequently tested. The dents or corners on the working surface of the rock plate are not allowed to be repaired. 6 Control of measuring instruments
The control of the measuring instrument only includes the initial test, subsequent verification and inspection in use: 6.1 Verification conditions
6.1.1 Environmental conditions
The verification environment temperature should be higher than the provisions of Table 6, and the verification location should avoid shaking. Table 6 Verification environment temperature
Level accuracy level
20 ± 8
The temperature equilibrium time of the verification tool and the plate to be tested is shown in the table. Table shows the temperature check balance time
Half plate specifications
Iron plate
Rock plate
Calibration tools
6.1.2 Calibration equipment
Main calibration equipment see Table 8
6.2 Calibration estimate
Control estimate see Table 8.
≥1600 × 1600 (mon)
≥12h
Lubricity change【h】
>1600 × 1600 (μrn)
ia 12h
Test date
Appearance and quality
Downward and side
Roughness of the surface
Balance and angle
Working surface half surface change
Toward
Surface flatness
Scrape cast iron plate
Number of points
JJG 317-200S
Table 8 Verification Items and Main Verification Equipment
Main Verification Items and Main Equipment
Surface roughness comparison sample or surface roughness measurement instrument Universal angle ruler with a graduation value of 2
O-level level: Self-calibration with a graduation value of 0.2\ or a graduation value of .1m White level, electronic level
0-level flat plate: graduation value of 1\ or a graduation value of 0.005mm/m White collimator, Electronic level
1, 2 level: the value is 0.01mmum for leveling instrument or combined level plate: the value is .zmmm level
size is small (400×40m) grinding plate: 0 photo scale and 4 (2nd level) gauge block
plane liquid dynamic gauge (00 slow plate sales value is 0.no1url see yellow comparator. Other accuracy levels are used with a base value of 0,0 1mml non-standard or use the above,
flat plate ruler who confirms that the level of the vehicle is not lower than the light plate (see Table 6 for details); "+" in this article indicates that it is not qualified, "-" indicates that the project is not qualified, 6.3 Verification method
6.3.1 Appearance and surface quality
Observe and test.
6.3.2 The surface roughness of the working surface and the side
Use the surface roughness measurement method to measure, when the measurement is not Select the same part, take the arithmetic mean value of the three positions measured as the surface roughness of the measured surface, or use the surface roughness ratio sample block for comparison. During arbitration verification, use the surface roughness measurement instrument. 6.3.3 Side angle
Use a universal ruler with a graduation value of 2 to measure
6.3.4 Working surface flatness
Before measurement, the working surface should be adjusted to make it level. 6
JJG E17—2005
6.3.4.1 The number of measuring points on the flat working surface is as specified in Table 10. 6.3.4.2 When the measuring points on the flat working surface are distributed in a counter-rotating manner, the measuring point positions are distributed as shown in (a), (b), and (e) in Figure 2.
Figure 2 Distribution of measuring point positions
Other distribution forms of measuring points are permitted provided that the uncertainty of the flatness measurement result satisfies formula (1).
6.3.4.3 Section 6 Method
The measured surface is divided into ten sections, and the inclination change relative to the measurement reference (natural water level or optical axis) is measured using a negative angle measuring instrument. The deviation of the connecting line between the two end points of each measuring point on the measured section is then calculated based on the flatness evaluation method. The deviation of the measuring points on each section of the working surface from the evaluation standard is calculated. When measuring, the measuring direction of the angle measuring instrument should be considered.
JJG 1I7—2005
Based on the specifications of the flat plate to be inspected, the long side, short side and filling angle line are selected according to formula (3:, (4) and 5) respectively. The best reduction is used,..,.
In the formula:,, the long side is the center of the inspection, the short side is the goodness of the distance F, nm:
Coefficient, = (the number of points on the flat plate is the number of training points y2
When measuring the best, the correction board effect will be produced by the tested product, on the contrary, it is said that the original flat plate quality is determined by the bridge board, according to The selected span line is from the half-length or short type of the bridge, and the end of the line is a white standard inspection instrument or a water-based resolution to obtain the number of military positions. Each time the plate is moved, the tail must be pressed: in the process of moving, the mirror or public assessment instrument and the plate shall not be aligned with the intended displacement report. The number of each measuring point on each crossing surface shall be reduced according to the daily alignment. The plane safety assessment method is complicated. The second mountain level calibration method is tt||6.3.4.4 month scale method
: For sizes smaller than 400mm×4 00mm plate is measured by comparison method using knife edge ruler and gauge block: when measuring, two gauge blocks with the same size (such as mml) are placed on both sides of the measured section of the flat plate. The gauge block is used to measure the distance between the knife edge ruler and the flat plate at the cross section point. The difference between the size of the gauge block when it is just inserted and the gauge blocks at both ends is the deviation of the measuring point from the connecting line of the two end points: according to the flatness determination method, the data is processed to obtain the flatness of the flat surface. .3.4.5 The following flatness calculations
6 .3.4.5.1 Diagonal line evaluation
The diagonal line of the horizontal plane is the horizontal line of the horizontal plane, and the interval between the horizontal line and the horizontal line is the interval between the horizontal line and the horizontal line.
Evaluation steps:
1 According to the reading of the measured blood point, [number], convert it into G (um) according to formula (6) or ().
This instrument value () is expressed as
2, =000-f
Instrument dew point skin direct pressure (\) is expressed as www.bzxz.net
i,=0.005-1x
Formula: -- Instrument degree;
New Jun cross light, nm
(remt)2 The working surface F of the rock plate should not have defects such as scratches, bumps, burns, pits, loose materials, etc. The above defects that do not affect the performance of the rock plate working surface are allowed to be on the subsequent test. The dents or corners on the working surface of the rock plate are not allowed to be repaired. 6 Control of measuring instruments
The control of the measuring instrument only includes the initial test, subsequent verification and in-use inspection: 6.1 Verification conditions
6.1.1 Environmental conditions
The verification environment temperature should be higher than the provisions of Table 6, and the verification location should avoid shaking. Table 6 Verification environment temperature
Level accuracy level
20 ± 8
The temperature equilibrium time of the verification tool and the plate to be tested is shown in the table. Table shows the temperature check balance time
Half plate specifications
Iron plate
Rock plate
Calibration tools
6.1.2 Calibration equipment
Main calibration equipment see Table 8
6.2 Calibration estimate
Control estimate see Table 8.
≥1600 × 1600 (mon)
≥12h
Lubricity change【h】
>1600 × 1600 (μrn)
ia 12h
Test date
Appearance and quality
Downward and side
Roughness of the surface
Balance and angle
Working surface half surface change
Toward
Surface flatness
Scrape cast iron plate
Number of points
JJG 317-200S
Table 8 Verification Items and Main Verification Equipment
Main Verification Items and Main Equipment
Surface roughness comparison sample or surface roughness measurement instrument Universal angle ruler with a graduation value of 2
O-level level: Self-calibration with a graduation value of 0.2\ or a graduation value of .1m White level, electronic level
0-level flat plate: graduation value of 1\ or a graduation value of 0.005mm/m White collimator, Electronic level
1, 2 level: the value is 0.01mmum for leveling instrument or combined level plate: the value is .zmmm level
size is small (400×40m) grinding plate: 0 photo scale and 4 (2nd level) gauge block
plane liquid dynamic gauge (00 slow plate sales value is 0.no1url see yellow comparator. Other accuracy levels are used with a base value of 0,0 1mml non-standard or use the above,
flat plate ruler who confirms that the level of the vehicle is not lower than the light plate (see Table 6 for details); "+" in this article indicates that it is not qualified, "-" indicates that the project is not qualified, 6.3 Verification method
6.3.1 Appearance and surface quality
Observe and test.
6.3.2 The surface roughness of the working surface and the side
Use the surface roughness measurement method to measure, when the measurement is not Select the same part, take the arithmetic mean value of the three positions measured as the surface roughness of the measured surface, or use the surface roughness ratio sample block for comparison. During arbitration verification, use the surface roughness measurement instrument. 6.3.3 Side angle
Use a universal ruler with a graduation value of 2 to measure
6.3.4 Working surface flatness
Before measurement, the working surface should be adjusted to make it level. 6
JJG E17—2005
6.3.4.1 The number of measuring points on the flat working surface is as specified in Table 10. 6.3.4.2 When the measuring points on the flat working surface are distributed in a counter-rotating manner, the measuring point positions are distributed as shown in (a), (b), and (e) in Figure 2.
Figure 2 Distribution of measuring point positions
Other distribution forms of measuring points are permitted provided that the uncertainty of the flatness measurement result satisfies formula (1).
6.3.4.3 Section 6 Method
The measured surface is divided into ten sections, and the inclination change relative to the measurement reference (natural water level or optical axis) is measured using a negative angle measuring instrument. The deviation of the connecting line between the two end points of each measuring point on the measured section is then calculated based on the flatness evaluation method. The deviation of the measuring points on each section of the working surface from the evaluation standard is calculated. When measuring, the measuring direction of the angle measuring instrument should be considered.
JJG 1I7—2005
Based on the specifications of the flat plate to be inspected, the long side, short side and filling angle line are selected according to formula (3:, (4) and 5) respectively. The best reduction is used,..,.
In the formula:,, the long side is the center of the inspection, the short side is the goodness of the distance F, nm:
Coefficient, = (the number of points on the flat plate is the number of training points y2
When measuring the best, the correction board effect will be produced by the tested product, on the contrary, it is said that the original flat plate quality is determined by the bridge board, according to The selected span line is from the half-length or short type of the bridge, and the end of the line is a white standard inspection instrument or a water-based resolution to obtain the number of military positions. Each time the plate is moved, the tail must be pressed: in the process of moving, the mirror or public assessment instrument and the plate shall not be aligned with the intended displacement report. The number of each measuring point on each crossing surface shall be reduced according to the daily alignment. The plane safety assessment method is complicated. The second mountain level calibration method is tt||6.3.4.4 month scale method
: For sizes smaller than 400mm×4 00mm plate is measured by comparison method using knife edge ruler and gauge block: when measuring, two gauge blocks with the same size (such as mml) are placed on both sides of the measured section of the flat plate. The gauge block is used to measure the distance between the knife edge ruler and the flat plate at the cross section point. The difference between the size of the gauge block when it is just inserted and the gauge blocks at both ends is the deviation of the measuring point from the connecting line of the two end points: according to the flatness determination method, the data is processed to obtain the flatness of the flat surface. .3.4.5 The following flatness calculations
6 .3.4.5.1 Diagonal line evaluation
The diagonal line of the horizontal plane is the horizontal line of the horizontal plane, and the interval between the horizontal line and the horizontal line is the interval between the horizontal line and the horizontal line.
Evaluation steps:
1 According to the reading of the measured blood point, [number], convert it into G (um) according to formula (6) or ().
This instrument value () is expressed as
2, =000-f
Instrument dew point skin direct pressure (\) is expressed as
i,=0.005-1x
Formula: -- Instrument degree;
New Jun cross light, nm
(remt)2 The working surface F of the rock plate should not have defects such as scratches, bumps, burns, pits, loose materials, etc. The above defects that do not affect the performance of the rock plate working surface are allowed to be on the subsequent test. The dents or corners on the working surface of the rock plate are not allowed to be repaired. 6 Control of measuring instruments
The control of the measuring instrument only includes the initial test, subsequent verification and in-use inspection: 6.1 Verification conditions
6.1.1 Environmental conditions
The verification environment temperature should be higher than the provisions of Table 6, and the verification location should avoid shaking. Table 6 Verification environment temperature
Level accuracy level
20 ± 8
The temperature equilibrium time of the verification tool and the plate to be tested is shown in the table. Table shows the temperature check balance time
Half plate specifications
Iron plate
Rock plate
Calibration tools
6.1.2 Calibration equipment
Main calibration equipment see Table 8
6.2 Calibration estimate
Control estimate see Table 8.
≥1600 × 1600 (mon)
≥12h
Lubricity change【h】
>1600 × 1600 (μrn)
ia 12h
Test date
Appearance and quality
Downward and side
Roughness of the surface
Balance and angle
Working surface half surface change
Toward
Surface flatness
Scrape cast iron plate
Number of points
JJG 317-200S
Table 8 Verification Items and Main Verification Equipment
Main Verification Items and Main Equipment
Surface roughness comparison sample or surface roughness measurement instrument Universal angle ruler with a graduation value of 2
O-level level: Self-calibration with a graduation value of 0.2\ or a graduation value of .1m White level, electronic level
0-level flat plate: graduation value of 1\ or a graduation value of 0.005mm/m White collimator, Electronic level
1, 2 level: the value is 0.01mmum for leveling instrument or combined level plate: the value is .zmmm level
size is small (400×40m) grinding plate: 0 photo scale and 4 (2nd level) gauge block
plane liquid dynamic gauge (00 slow plate sales value is 0.no1url see yellow comparator. Other accuracy levels are used with a base value of 0,0 1mml non-standard or use the above,
flat plate ruler who confirms that the level of the vehicle is not lower than the light plate (see Table 6 for details); "+" in this article indicates that it is not qualified, "-" indicates that the project is not qualified, 6.3 Verification method
6.3.1 Appearance and surface quality
Observe and test.
6.3.2 The surface roughness of the working surface and the side
Use the surface roughness measurement method to measure, when the measurement is not Select the same part, take the arithmetic mean value of the three positions measured as the surface roughness of the measured surface, or use the surface roughness ratio sample block for comparison. During arbitration verification, use the surface roughness measurement instrument. 6.3.3 Side angle
Use a universal ruler with a graduation value of 2 to measure
6.3.4 Working surface flatness
Before measurement, the working surface should be adjusted to make it level. 6
JJG E17—2005
6.3.4.1 The number of measuring points on the flat working surface is as specified in Table 10. 6.3.4.2 When the measuring points on the flat working surface are distributed in a counter-rotating manner, the measuring point positions are distributed as shown in (a), (b), and (e) in Figure 2.
Figure 2 Distribution of measuring point positions
Other distribution forms of measuring points are permitted provided that the uncertainty of the flatness measurement result satisfies formula (1).
6.3.4.3 Section 6 Method
The measured surface is divided into ten sections, and the inclination change relative to the measurement reference (natural water level or optical axis) is measured using a negative angle measuring instrument. The deviation of the connecting line between the two end points of each measuring point on the measured section is then calculated based on the flatness evaluation method. The deviation of the measuring points on each section of the working surface from the evaluation standard is calculated. When measuring, the measuring direction of the angle measuring instrument should be considered.
JJG 1I7—2005
Based on the specifications of the flat plate to be inspected, the long side, short side and filling angle line are selected according to formula (3:, (4) and 5) respectively. The best reduction is used,..,.
In the formula:,, the long side is the center of the inspection, the short side is the goodness of the distance F, nm:
Coefficient, = (the number of points on the flat plate is the number of training points y2
When measuring the best, the correction board effect will be produced by the tested product, on the contrary, it is said that the original flat plate quality is determined by the bridge board, according to The selected span line is from the half-length or short type of the bridge, and the end of the line is a white standard inspection instrument or a water-based resolution to obtain the number of military positions. Each time the plate is moved, the tail must be pressed: in the process of moving, the mirror or public assessment instrument and the plate shall not be aligned with the intended displacement report. The number of each measuring point on each crossing surface shall be reduced according to the daily alignment. The plane safety assessment method is complicated. The second mountain level calibration method is tt||6.3.4.4 month scale method
: For sizes smaller than 400mm×4 00mm plate is measured by comparison method using knife edge ruler and gauge block: when measuring, two gauge blocks with the same size (such as mml) are placed on both sides of the measured section of the flat plate. The gauge block is used to measure the distance between the knife edge ruler and the flat plate at the cross section point. The difference between the size of the gauge block when it is just inserted and the gauge blocks at both ends is the deviation of the measuring point from the connecting line of the two end points: according to the flatness determination method, the data is processed to obtain the flatness of the flat surface. .3.4.5 The following flatness calculations
6 .3.4.5.1 Diagonal line evaluation
The diagonal line of the horizontal plane is the horizontal line of the horizontal plane, and the interval between the horizontal line and the horizontal line is the interval between the horizontal line and the horizontal line.
Evaluation steps:
1 According to the reading of the measured blood point, [number], convert it into G (um) according to formula (6) or ().
This instrument value () is expressed as
2, =000-f
Instrument dew point skin direct pressure (\) is expressed as
i,=0.005-1x
Formula: -- Instrument degree;
New Jun cross light, nm
(remt)No1url See yellow comparator. The remaining accuracy levels are used with a base value of 0.01mml or above, and the flat plate is not less than the level of the light plate (see Table 6 for details); "+" in this text indicates that it is not qualified, and "-" indicates that it is not qualified. 6.3 Verification method 6.3.1 Appearance and surface quality Observation and test. 6.3.2 The surface roughness of the working surface and the side surface is measured by surface roughness measurement. When measuring, select a different part and take the arithmetic mean value of the measurement at three positions as the surface roughness of the measured surface. It can also be compared with a surface roughness comparison sample. When arbitrating, use a surface roughness meter to measure. 6.3.3 Side angle
Use a universal ruler with a graduation value of 2 to measure
6.3.4 Working surface flatness
Before measuring, the flat working surface should be adjusted to make its base level. 6
JJG E17—2005
6.3.4.1 The number of measuring points on the flat working surface is as specified in Table 10. 6.3.4.2 When the measuring points on the flat working surface are distributed by the counter-balance, the measuring base point positions are distributed as shown in (a), (b), and (e) in Figure 2.
Figure 2 Distribution of measuring point positions
Under the condition that the uncertainty of the flatness measurement result satisfies formula (1), other distribution forms of measuring points are allowed
Section 6.3.4.3 Method
The measured surface is divided into ten sections, and the inclination change relative to the measurement reference (natural water level or optical axis) is measured with a negative angle measuring instrument. Then, the deviation of the connecting line of each measuring point of the measured section to the two end points is calculated, and then the deviation of the measuring point of each section of the working surface to the evaluation standard is calculated according to the flatness evaluation method. When measuring, the measuring direction of the angle measuring instrument should be considered.
JJG 1I7—2005
Based on the specifications of the flat plate to be inspected, the long side, short side and filling angle line are selected according to formula (3:, (4) and 5) respectively. The best reduction is used,..,.
In the formula:,, the long side is the center of the inspection, the short side is the goodness of the distance F, nm:
Coefficient, = (the number of points on the flat plate is the number of training points y2
When measuring the best, the correction board effect will be produced by the tested product, on the contrary, it is said that the original flat plate quality is determined by the bridge board, according to The selected span line is from the half-length or short type of the bridge, and the end of the line is a white standard inspection instrument or a water-based resolution to obtain the number of military positions. Each time the plate is moved, the tail must be pressed: in the process of moving, the mirror or public assessment instrument and the plate shall not be aligned with the intended displacement report. The number of each measuring point on each crossing surface shall be reduced according to the daily alignment. The plane safety assessment method is complicated. The second mountain level calibration method is tt||6.3.4.4 month scale method
: For sizes smaller than 400mm×4 00mm plate is measured by comparison method using knife edge ruler and gauge block: when measuring, two gauge blocks with the same size (such as mml) are placed on both sides of the measured section of the flat plate. The gauge block is used to measure the distance between the knife edge ruler and the flat plate at the cross section point. The difference between the size of the gauge block when it is just inserted and the gauge blocks at both ends is the deviation of the measuring point from the connecting line of the two end points: according to the flatness determination method, the data is processed to obtain the flatness of the flat surface. .3.4.5 The following flatness calculations
6 .3.4.5.1 Diagonal line evaluation
The diagonal line of the horizontal plane is the horizontal line of the horizontal plane, and the interval between the horizontal line and the horizontal line is the interval between the horizontal line and the horizontal line.
Evaluation steps:
1 According to the reading of the measured blood point, [number], convert it into G (um) according to formula (6) or ().
This instrument value () is expressed as
2, =000-f
Instrument dew point skin direct pressure (\) is expressed as
i,=0.005-1x
Formula: -- Instrument degree;
New Jun cross light, nm
(remt)No1url See yellow comparator. The remaining accuracy levels are used with a base value of 0.01mml or above, and the flat plate is not less than the level of the light plate (see Table 6 for details); "+" in this text indicates that it is not qualified, and "-" indicates that it is not qualified. 6.3 Verification method 6.3.1 Appearance and surface quality Observation and test. 6.3.2 The surface roughness of the working surface and the side surface is measured by surface roughness measurement. When measuring, select a different part and take the arithmetic mean value of the measurement at three positions as the surface roughness of the measured surface. It can also be compared with a surface roughness comparison sample. When arbitrating, use a surface roughness meter to measure. 6.3.3 Side angle
Use a universal ruler with a graduation value of 2 to measure
6.3.4 Working surface flatness
Before measuring, the flat working surface should be adjusted to make its base level. 6
JJG E17—2005
6.3.4.1 The number of measuring points on the flat working surface is as specified in Table 10. 6.3.4.2 When the measuring points on the flat working surface are distributed by the counter-balance, the measuring base point positions are distributed as shown in (a), (b), and (e) in Figure 2.
Figure 2 Distribution of measuring point positions
Under the condition that the uncertainty of the flatness measurement result satisfies formula (1), other distribution forms of measuring points are allowed
Section 6.3.4.3 Method
The measured surface is divided into ten sections, and the inclination change relative to the measurement reference (natural water level or optical axis) is measured with a negative angle measuring instrument. Then, the deviation of the connecting line of each measuring point of the measured section to the two end points is calculated, and then the deviation of the measuring point of each section of the working surface to the evaluation standard is calculated according to the flatness evaluation method. When measuring, the measuring direction of the angle measuring instrument should be considered.
JJG 1I7—2005
Based on the specifications of the flat plate to be inspected, the long side, short side and filling angle line are selected according to formula (3:, (4) and 5) respectively. The best reduction is used,..,.
In the formula:,, the long side is the center of the inspection, the short side is the goodness of the distance F, nm:
Coefficient, = (the number of points on the flat plate is the number of training points y2
When measuring the best, the correction board effect will be produced by the tested product, on the contrary, it is said that the original flat plate quality is determined by the bridge board, according to The selected span line is from the half-length or short type of the bridge, and the end of the line is a white standard inspection instrument or a water-based resolution to obtain the number of military positions. Each time the plate is moved, the tail must be pressed: in the process of moving, the mirror or public assessment instrument and the plate shall not be aligned with the intended displacement report. The number of each measuring point on each crossing surface shall be reduced according to the daily alignment. The plane safety assessment method is complicated. The second mountain level calibration method is tt||6.3.4.4 month scale method
: For sizes smaller than 400mm×4 00mm plate is measured by comparison method using knife edge ruler and gauge block: when measuring, two gauge blocks with the same size (such as mml) are placed on both sides of the measured section of the flat plate. The gauge block is used to measure the distance between the knife edge ruler and the flat plate at the cross section point. The difference between the size of the gauge block when it is just inserted and the gauge blocks at both ends is the deviation of the measuring point from the connecting line of the two end points: according to the flatness determination method, the data is processed to obtain the flatness of the flat surface. .3.4.5 The following flatness calculations
6 .3.4.5.1 Diagonal line evaluation
The diagonal line of the horizontal plane is the horizontal line of the horizontal plane, and the interval between the horizontal line and the horizontal line is the interval between the horizontal line and the horizontal line.
Evaluation steps:
1 According to the reading of the measured blood point, [number], convert it into G (um) according to formula (6) or ().
This instrument value () is expressed as
2, =000-f
Instrument dew point skin direct pressure (\) is expressed as
i,=0.005-1x
Formula: -- Instrument degree;
New Jun cross light, nm
(remt)
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