Single sampling procedures and tables for inspection having desired operating characteristics by variables for percent nonconforming
Some standard content:
ICS 03. 120. 30
National Standard of the People's Republic of China
GB/T 8053—2001
Metrological standard for percent nonconforming
Single sampling procedures and tables for inspection having desiredoperating characteristics by variables for percent nonconforming2001-03-05Promulgated
Implemented on 2001-09-01
Promulgated by the State Administration of Quality and Technical Supervision
GB/T 8053--2001
2 Reference standards
3 Definitions and symbols
3.1 Definitions
3.2 Symbols
4 Procedure for sampling inspection
5 Implementation of sampling inspection
Choice of sampling inspection type
Determination of sampling inspection method
Definition of acceptable quality and limit quality
Determination of sampling plan
Batch composition and sample extraction
5. 6 Inspection and calculation of samples
Judgment on whether the batch is acceptable
5.8 Batch processing
6 Application examples
6.1 "a\ method
6.2 "s\ method
7 Sampling table
Table 1\. "Single-sided limit sampling plan table of method
Table 2\c\double-sided limit sampling plan table of method
Table 3\s\single-sided limit sampling plan table of method
Appendix A (Appendix of standard) Method and application of sampling characteristic curve Appendix B (Appendix of standard)
Table of percentile values of commonly used defective product rate
Appendix C (Suggestive Appendix)
References
GB/T8053—2001
This standard is the first revision of GB/T8053-1987. The main changes are: 1. Adjustments were made to some sampling plans in the original Table 1 and Table 2. 46 plans were adjusted in the original Table 1 and 30 plans were adjusted in the original Table 2 to make the sampling tables more consistent;
2. " was added. "The double-sided limit sampling table of this standard has expanded the scope of application of the standard. Appendices A and B of this standard are both appendices of the standard. Appendix C of this standard is a suggestive appendix.
This standard is proposed and managed by the National Technical Committee for the Application of Statistical Methods for Standardization. This standard is drafted by the Sampling Inspection Sub-Technical Committee of the National Technical Committee for the Application of Statistical Methods for Standardization. The super-drafting units of this standard are: Beijing University of Technology, China Standard Promotion Research Center. The main drafters of this standard are: Yu Shanqi, Tao Xudong, Lu Xiaohua, Ren Jiqiang, Xiong Ying, Liu Wen. National Standard of the People's Republic of China
Metrological standard type of nonconforming rate
Single sampling procedures and tables for inspection having desiredoperating charactcristies by variables for percent nonconforming1Scope
GB/T 8053—2001
Replaces GB/T8053—1987
This standard specifies the procedure and implementation method of the measurement standard type single sampling inspection with the batch defective product rate as the quality indicator. This standard is applicable to the inspection of product quality characteristics expressed by measurement values that obey or approximately obey the normal distribution. The sampling plan recommended by this standard is based on the production side risk α=0.05 and the user side risk α=0.10 Design. 2 Referenced standards
The clauses contained in the following standards constitute the clauses of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T3358.2—1993 Statistical terminology Part 2 Statistical quality control terminology GB/T4091—2001 Conventional control chart (idlt[SO8258:1991) GB/T4883—1985 Statistical processing and interpretation of data Judgment and processing of abnormal values in normal samples GB/T6583—1994 Quality management and quality assurance terminology (idtIS()8402:1994) GB/T8054-1995 Standard single sampling inspection procedures and sampling tables for average values 3 Definitions and symbols
3. 1 Definitions
This standard adopts the following definitions.
3.1.1 Unit of product unit of product is the basic unit for dividing products for the purpose of implementing sampling inspection. 3.1.2 Inspection lot (batch) inspectionlat is the batch submitted for inspection or acceptance. (See 3.26 in G13/T3358.2-1993) 3.1.3 Metrological quality characteristics variablesquality rhararteristic the quality characteristics of the inspected unit product that can be measured by a continuous scale. 3.1.4 Sampling inspection by variables is the process of randomly selecting a certain number of unit products from the batch according to the prescribed sampling plan. The values of their quality characteristics are obtained by measurement, testing or other methods, compared with the quality requirements, and judging whether the batch of products can be accepted. 3.1.5 Single sampling inspection is the process of deciding whether to accept the batch based on the inspection results of the sample taken from the batch at one time. (See GB/T3358.2-1993 4.4) 3.1.6 [Operating characteristic curve to a sampling inspection plan] For a given sampling plan, it is a curve that shows the functional relationship between the probability of batch acceptance and the batch quality level. (See GB3/T3358.2-1993, approved by the State Administration of Quality and Technical Supervision on March 5, 2001, and implemented on September 1, 2001
4.34A Class)
3.1.7 Acceptable quality Acceptable quality In GB/T8053-2001
, in sampling inspection, it corresponds to a certain, higher probability of acceptance and is considered satisfactory batch quality level. 3.1.8 Limiting quality For isolated batches, for sampling inspection, it is limited to a certain quality level with a low probability of acceptance. 3.1.9 Producer's risk (PR) For a given sampling plan, the probability of rejection when the batch quality level (defective product rate) is a specified acceptable value. 3.1.10 Consumers risk (CR) For a given sampling plan, the probability of acceptance when the batch quality level (defective product rate) is a specified unsatisfactory value. 3.1.11 Standard sampling inspection sampling inspectian having desiredl operating characteristics Sampling inspection in which the producer risk and the consumer risk are fixed to specific values in order to protect the interests of both production and users. 3.1.12 Sampling plan sampling planbzxz.net
A specific plan that specifies the sample size and related acceptance criteria. 3.1.13 Sampling inspection types sampling inspection types The categories of sampling inspections divided according to whether the batch standard deviation is known or unknown when determining the sampling plan. This standard divides into two types of sampling inspections. 3.1.14\a\method\g\method
When the batch standard deviation is known, the method of using the sample mean and batch standard deviation to determine whether the batch is acceptable. 3.1.15 \,\method\s\method
When the batch standard deviation is unknown, the method of using the sample mean and sample standard deviation to determine whether the batch is acceptable. 3.1.16Quality statisticsQuality statistics is a function composed of specification limits, sample mean and batch standard deviation (or sample standard deviation), which is used to determine whether the batch is acceptable. There are two quality statistics: upper specification limit and lower specification limit.
3.1.17Acceptability constant,acceptancc constant In the acceptance rule of metrological acceptance sampling, a constant determined by the acceptable quality level and the sample size used to determine whether a batch is acceptable. (See 4.26 in GB/T 3358.2-1993) 3.1.18 Inspection method Inspectian cages The inspection method is determined by the required quality specification limit. This standard has three methods: upper specification limit, lower specification limit and double-sided specification limit.
3.1.19 Specification limit specification limit The limit value for determining whether a unit product is qualified. 3.1.20 Upper specification limit upper specification limit specifies the maximum limit value of the quality characteristic allowed for a qualified product. 3.1.21 Lower specification limit lower specification limit specifies the minimum limit value of the quality characteristic allowed for a qualified product. 3.1.22 Double-sided specification limit dauble specification limit specifies the situation where both the upper specification limit and the lower specification limit are specified. 3.2 Symbols
This standard uses the following symbols:
U. Upper specification limit.
L: Lower specification limit.
p: Batch defective rate.
Po: Acceptable quality when batch defective rate is used as quality indicator. GB/T 8053 --- 2001
: Limit quality when batch defective rate is used as quality indicator. x: Risk of manufacturer.
: Risk of user.
She1-,: Quantile when the upper probability of standard normal distribution is force. n: Sample size,
: Unit product quality characteristic value in the sample,, represents the unit product quality characteristic value. None: Sample mean.
5: Sample standard deviation.
R: Sample range.
Q: Batch standard deviation.
He: Statistical estimate or empirical estimate of batch standard deviation. Qt: Quality statistic of upper specification limit. Where U
α method: Qu=
is method; Qu-
QL: quality statistic of lower specification limit·where—L
5 method: Q.
g method: Q=
Correction: acceptance constant.
P. : acceptance probability of inspection lot.
4 Procedure for sampling inspection
The procedures for implementing this standard are as follows
a) Select the type of sampling inspection;
b) Determine the sampling inspection method;
e) Specify the acceptable quality and limit quality; d) Determine the sampling plan;
e) Constitute the batch and extract the sample;
f) Test the sample and calculate the result;
g) Determine whether the batch can be accepted:
h) Process the inspection batch.
5 Implementation of Sampling Inspection
5.1 Selection of Sampling Inspection Type
When product quality is stable and there is recent quality management or sampling inspection data that can predetermine the batch standard deviation, the "." method can be used. If there is no recent data or even if there is recent data, but the quality is not stable, the "" method should be used. The inspection method for whether product quality is stable can be implemented in accordance with Appendix A of GB/T8054--1995. When the manufacturer and the user have a long supply period, whether the "S" method or the ".\ method is used: the sample mean and sample standard deviation must be recorded in the form of a control chart. If the control chart shows that the sample standard deviation is in a state of statistical control during the application of the "\ method, it is allowed to convert from the "S\ method to the ".\ method. If the control chart shows that the sample standard deviation is not in a state of statistical control during the application of the ".\ method, it is necessary to convert from the "C" method to the "S" method immediately. If the control chart does not show the loss of statistical control, but indicates that the batch standard deviation becomes smaller or larger, the batch standard deviation value used should be updated at any time. The use of the control chart shall be carried out in accordance with GB/T4091. 5.2 Determination of sampling inspection method GB/T 8053-2001 This standard has three sampling inspection methods: upper specification limit, lower specification limit and double-sided specification limit. It is provided for users of this standard to select according to the different specification limits required by the product standard quality. The double-sided specification limit "," method must meet the following two conditions to apply the standard chart: UL>2.89u1-%g Where 41ui--, and ui-u.2. are the upper probability po, P, and 0.2Pa of the standard normal distribution. Appendix B gives the quantile values of the priority defective product rate series used in this standard. When the sampling inspection is carried out by the “g\ method, the value of the negative in the above conditions shall be agreed upon by the manufacturer and the user based on past experience. 5.3 Provisions on acceptable quality and limit quality Acceptable quality and limit quality shall be determined by the manufacturer and the user through consultation based on the quality requirements in the product standard. 5.4 Determination of sampling plan
5.4.1“g\ method
Determine the sampling plan according to the steps listed in the table
Working steps
2“” method||tt ||Work steps
Work content
Specify quality requirements
Determine values
Determine sampling plan
Work content
Specify quality requirements
Determine sampling plan
5.5Batch composition and sample extraction
Upper specification limit
Inspect left form
Lower specification limit
Two-sided specification limit
From the recent 20 ~-25 groups of production to -s (or R) control chart data, or the recent 20 to 25 batches of sampling inspection data. Estimate by the method in Appendix B of GB/T 8054-1995. Values are given in Table 1. Detection control values are given in Table 3. Sampling plan is determined according to the steps in the table. Upper specification limit is given in Table 3. Detection point value is given in Inspection method. Lower specification limit is given in pepi and in Table 2. Detection value is given in Table 2. Bilateral specification limit is given in the same way as above (when the given conditions meet the use conditions of bilateral specification limits). The products submitted for inspection must be submitted in batches. The submitted batches may be the same or different from the investment batches, sales batches and transportation batches, but they shall consist of unit products with the same specifications and models, the same quality grades and made from the same materials and raw materials under the same process conditions. The batch size shall be agreed upon by the manufacturer and the user according to the sales situation and actual production conditions. The required samples shall be randomly drawn from the whole batch and carried out after or during the batch formation process. 5.6 Inspection and calculation of samples
The sample shall be inspected one by one according to the test, measurement or other methods specified in the product standard or order contract and other relevant documents. The inspection results shall be recorded completely and accurately. The mean and standard deviation of the sample shall be calculated. If individual abnormal data that deviates significantly from other inspection results of the sample are found during the inspection, the technical or physical reasons for the abnormal data shall be firstly found. If the reasons cannot be found, the user may make a judgment according to GB/T4883 with the consent of the user: Then, according to the nature of the abnormal data, the manufacturer and the user shall negotiate to determine whether to eliminate it. After the abnormal data is eliminated, the corresponding number of unit products shall be randomly drawn from the inspection batch again to supplement the sample required by the sampling plan, and re-measure and calculate.
5.7 Determination of whether a batch can be accepted
5.7.1 ".\ rule of judgment
a) Given the upper specification limit,
if Qu=table, the batch is accepted; QuLower specification limit.
p: Batch defective rate.
Po: Acceptable quality when batch defective rate is used as quality indicator. GB/T 8053 --- 2001
: Limit quality when batch defective rate is used as quality indicator. x: Producer risk.
: User risk.
社1-,: Quantile when the upper probability of the standard normal distribution is force. n: Sample size,
: Unit product quality characteristic value in the sample,, represents the unit product quality characteristic value. None: Sample mean.
5: Sample standard deviation.
R: Sample range.
Q: Batch standard deviation.
合: Statistical estimate or empirical estimate of batch standard deviation. Qt: Quality statistic of upper specification limit. Where U
α method: Qu=
is method; Qu-
QL: quality statistic of lower specification limit·where—L
5 method: Q.
g method: Q=
Correction: acceptance constant.
P. : acceptance probability of inspection lot.
4 Procedure for sampling inspection
The procedures for implementing this standard are as follows
a) Select the type of sampling inspection;
b) Determine the sampling inspection method;
e) Specify the acceptable quality and limit quality; d) Determine the sampling plan;
e) Constitute the batch and extract the sample;
f) Test the sample and calculate the result;
g) Determine whether the batch can be accepted:
h) Process the inspection batch.
5 Implementation of Sampling Inspection
5.1 Selection of Sampling Inspection Type
When product quality is stable and there is recent quality management or sampling inspection data that can predetermine the batch standard deviation, the "." method can be used. If there is no recent data or even if there is recent data, but the quality is not stable, the "" method should be used. The inspection method for whether product quality is stable can be implemented in accordance with Appendix A of GB/T8054--1995. When the manufacturer and the user have a long supply period, whether the "S" method or the ".\ method is used: the sample mean and sample standard deviation must be recorded in the form of a control chart. If the control chart shows that the sample standard deviation is in a state of statistical control during the application of the "\ method, it is allowed to convert from the "S\ method to the ".\ method. If the control chart shows that the sample standard deviation is not in a state of statistical control during the application of the ".\ method, it is necessary to convert from the "C" method to the "S" method immediately. If the control chart does not show the loss of statistical control, but indicates that the batch standard deviation becomes smaller or larger, the batch standard deviation value used should be updated at any time. The use of the control chart shall be carried out in accordance with GB/T4091. 5.2 Determination of sampling inspection method GB/T 8053-2001 This standard has three sampling inspection methods: upper specification limit, lower specification limit and double-sided specification limit. It is provided for users of this standard to select according to the different specification limits required by the product standard quality. The double-sided specification limit "," method must meet the following two conditions to apply the standard chart: UL>2.89u1-%g Where 41ui--, and ui-u.2. are the upper probability po, P, and 0.2Pa of the standard normal distribution. Appendix B gives the quantile values of the priority defective product rate series used in this standard. When the sampling inspection is carried out by the “g\ method, the value of the negative in the above conditions shall be agreed upon by the manufacturer and the user based on past experience. 5.3 Provisions on acceptable quality and limit quality Acceptable quality and limit quality shall be determined by the manufacturer and the user through consultation based on the quality requirements in the product standard. 5.4 Determination of sampling plan
5.4.1“g\ method
Determine the sampling plan according to the steps listed in the table
Working steps
2“” method||tt ||Work steps
Work content
Specify quality requirements
Determine values
Determine sampling plan
Work content
Specify quality requirements
Determine sampling plan
5.5Batch composition and sample extraction
Upper specification limit
Inspect left form
Lower specification limit
Two-sided specification limit
From the recent 20 ~-25 groups of production to -s (or R) control chart data, or the recent 20 to 25 batches of sampling inspection data. Estimate by the method in Appendix B of GB/T 8054-1995. Values are given in Table 1. Detection control values are given in Table 3. Sampling plan is determined according to the steps in the table. Upper specification limit is given in Table 3. Detection point value is given in Inspection method. Lower specification limit is given in pepi and in Table 2. Detection value is given in Table 2. Bilateral specification limit is given in the same way as above (when the given conditions meet the use conditions of bilateral specification limits). The products submitted for inspection must be submitted in batches. The submitted batches may be the same or different from the investment batches, sales batches and transportation batches, but they shall consist of unit products with the same specifications and models, the same quality grades and made from the same materials and raw materials under the same process conditions. The batch size shall be agreed upon by the manufacturer and the user according to the sales situation and actual production conditions. The required samples shall be randomly drawn from the whole batch and carried out after or during the batch formation process. 5.6 Inspection and calculation of samples
The sample shall be inspected one by one according to the test, measurement or other methods specified in the product standard or order contract and other relevant documents. The inspection results shall be recorded completely and accurately. The mean and standard deviation of the sample shall be calculated. If individual abnormal data that deviates significantly from other inspection results of the sample are found during the inspection, the technical or physical reasons for the abnormal data shall be firstly found. If the reasons cannot be found, the user may make a judgment according to GB/T4883 with the consent of the user: Then, according to the nature of the abnormal data, the manufacturer and the user shall negotiate to determine whether to eliminate it. After the abnormal data is eliminated, the corresponding number of unit products shall be randomly drawn from the inspection batch again to supplement the sample required by the sampling plan, and re-measure and calculate.
5.7 Determination of whether a batch can be accepted
5.7.1 ".\ rule of judgment
a) Given the upper specification limit,
if Qu=table, the batch is accepted; QuLower specification limit.
p: Batch defective rate.
Po: Acceptable quality when batch defective rate is used as quality indicator. GB/T 8053 --- 2001
: Limit quality when batch defective rate is used as quality indicator. x: Producer risk.
: User risk.
社1-,: Quantile when the upper probability of the standard normal distribution is force. n: Sample size,
: Unit product quality characteristic value in the sample,, represents the unit product quality characteristic value. None: Sample mean.
5: Sample standard deviation.
R: Sample range.
Q: Batch standard deviation.
合: Statistical estimate or empirical estimate of batch standard deviation. Qt: Quality statistic of upper specification limit. Where U
α method: Qu=
is method; Qu-
QL: quality statistic of lower specification limit·where—L
5 method: Q.
g method: Q=
Correction: acceptance constant.
P. : acceptance probability of inspection lot.
4 Procedure for sampling inspection
The procedures for implementing this standard are as follows
a) Select the type of sampling inspection;
b) Determine the sampling inspection method;
e) Specify the acceptable quality and limit quality; d) Determine the sampling plan;
e) Constitute the batch and extract the sample;
f) Test the sample and calculate the result;
g) Determine whether the batch can be accepted:
h) Process the inspection batch.
5 Implementation of Sampling Inspection
5.1 Selection of Sampling Inspection Type
When product quality is stable and there is recent quality management or sampling inspection data that can predetermine the batch standard deviation, the "." method can be used. If there is no recent data or even if there is recent data, but the quality is not stable, the "" method should be used. The inspection method for whether product quality is stable can be implemented in accordance with Appendix A of GB/T8054--1995. When the manufacturer and the user have a long supply period, whether the "S" method or the ".\ method is used: the sample mean and sample standard deviation must be recorded in the form of a control chart. If the control chart shows that the sample standard deviation is in a state of statistical control during the application of the "\ method, it is allowed to convert from the "S\ method to the ".\ method. If the control chart shows that the sample standard deviation is not in a state of statistical control during the application of the ".\ method, it is necessary to convert from the "C" method to the "S" method immediately. If the control chart does not show the loss of statistical control, but indicates that the batch standard deviation becomes smaller or larger, the batch standard deviation value used should be updated at any time. The use of the control chart shall be carried out in accordance with GB/T4091. 5.2 Determination of sampling inspection method GB/T 8053-2001 This standard has three sampling inspection methods: upper specification limit, lower specification limit and double-sided specification limit. It is provided for users of this standard to select according to the different specification limits required by the product standard quality. The double-sided specification limit "," method must meet the following two conditions to apply the standard chart: UL>2.89u1-%g Where 41ui--, and ui-u.2. are the upper probability po, P, and 0.2Pa of the standard normal distribution. Appendix B gives the quantile values of the priority defective product rate series used in this standard. When the sampling inspection is carried out by the “g\ method, the value of the negative in the above conditions shall be agreed upon by the manufacturer and the user based on past experience. 5.3 Provisions on acceptable quality and limit quality Acceptable quality and limit quality shall be determined by the manufacturer and the user through consultation based on the quality requirements in the product standard. 5.4 Determination of sampling plan
5.4.1“g\ method
Determine the sampling plan according to the steps listed in the table
Working steps
2“” method||tt ||Work steps
Work content
Specify quality requirements
Determine values
Determine sampling plan
Work content
Specify quality requirements
Determine sampling plan
5.5Batch composition and sample extraction
Upper specification limit
Inspect left form
Lower specification limit
Two-sided specification limit
From the recent 20 ~-25 groups of production to -s (or R) control chart data, or the recent 20 to 25 batches of sampling inspection data. Estimate by the method in Appendix B of GB/T 8054-1995. Values are given in Table 1. Detection control values are given in Table 3. Sampling plan is determined according to the steps in the table. Upper specification limit is given in Table 3. Detection point value is given in Inspection method. Lower specification limit is given in pepi and in Table 2. Detection value is given in Table 2. Bilateral specification limit is given in the same way as above (when the given conditions meet the use conditions of bilateral specification limits). The products submitted for inspection must be submitted in batches. The submitted batches may be the same or different from the investment batches, sales batches and transportation batches, but they shall consist of unit products with the same specifications and models, the same quality grades and made from the same materials and raw materials under the same process conditions. The batch size shall be agreed upon by the manufacturer and the user according to the sales situation and actual production conditions. The required samples shall be randomly drawn from the whole batch and carried out after or during the batch formation process. 5.6 Inspection and calculation of samples
The sample shall be inspected one by one according to the test, measurement or other methods specified in the product standard or order contract and other relevant documents. The inspection results shall be recorded completely and accurately. The mean and standard deviation of the sample shall be calculated. If individual abnormal data that deviates significantly from other inspection results of the sample are found during the inspection, the technical or physical reasons for the abnormal data shall be firstly found. If the reasons cannot be found, the user may make a judgment according to GB/T4883 with the consent of the user: Then, according to the nature of the abnormal data, the manufacturer and the user shall negotiate to determine whether to eliminate it. After the abnormal data is eliminated, the corresponding number of unit products shall be randomly drawn from the inspection batch again to supplement the sample required by the sampling plan, and re-measure and calculate.
5.7 Determination of whether a batch can be accepted
5.7.1“.\ Judgment rules
a) Given the upper specification limit,
If Qu=table, the batch is accepted; QuIf the control chart shows that the sample standard deviation is not in a state of statistical control, the "c" method must be converted to the "s" method. If the control chart does not show that the statistical control state is lost, but it shows that the batch standard deviation becomes smaller or larger, the batch standard deviation used should be updated at any time. The use of the control chart shall be carried out in accordance with GB/T4091. 5.2 Determination of sampling inspection method GB/T 8053—2001 This standard has three sampling inspection methods: upper specification limit, lower specification limit and double-sided specification limit. It is for users of this standard to choose according to the different specification limits required by the product standard quality. When using the double-sided specification limit "," method, the following two conditions must be met before the standard chart can be applied: UL>2.89u1-%g where 41ui--, and ui-u.2. is the quantile when the upper probability po, P, and 0.2Pa of the standard normal distribution are equal. Appendix B gives the quantile values of the priority defective product rate series used in this standard. When the sampling inspection is the "g\ method, the value of the negative value in the above conditions shall be agreed upon by the manufacturer and the user based on past experience. 5.3 Provisions on acceptable quality and limit quality Acceptable quality and limit quality shall be determined by the manufacturer and the user through consultation based on the quality requirements in the product standard. 5.4 Determination of the sampling plan
5.4.1 "g\ method
Determine the sampling plan according to the steps listed in the table
Working steps
2 "" method||tt ||Work steps
Work content
Specify quality requirements
Determine values
Determine sampling plan
Work content
Specify quality requirements
Determine sampling plan
5.5Batch composition and sample extraction
Upper specification limit
Inspect left form
Lower specification limit
Two-sided specification limit
From the recent 20 ~-25 groups of production to -s (or R) control chart data, or the recent 20 to 25 batches of sampling inspection data. Estimate by the method in Appendix B of GB/T 8054-1995. Values are given in Table 1. Detection control values are given in Table 3. Sampling plan is determined according to the steps in the table. Upper specification limit is given in Table 3. Detection point value is given in Inspection method. Lower specification limit is given in pepi and in Table 2. Detection value is given in Table 2. Bilateral specification limit is given in the same way as above (when the given conditions meet the use conditions of bilateral specification limits). The products submitted for inspection must be submitted in batches. The submitted batches may be the same or different from the investment batches, sales batches and transportation batches, but they shall consist of unit products with the same specifications and models, the same quality grades and made from the same materials and raw materials under the same process conditions. The batch size shall be agreed upon by the manufacturer and the user according to the sales situation and actual production conditions. The required samples shall be randomly drawn from the whole batch and carried out after or during the batch formation process. 5.6 Inspection and calculation of samples
The sample shall be inspected one by one according to the test, measurement or other methods specified in the product standard or order contract and other relevant documents. The inspection results shall be recorded completely and accurately. The mean and standard deviation of the sample shall be calculated. If individual abnormal data that deviates significantly from other inspection results of the sample are found during the inspection, the technical or physical reasons for the abnormal data shall be firstly found. If the reasons cannot be found, the user may make a judgment according to GB/T4883 with the consent of the user: Then, according to the nature of the abnormal data, the manufacturer and the user shall negotiate to determine whether to eliminate it. After the abnormal data is eliminated, the corresponding number of unit products shall be randomly drawn from the inspection batch again to supplement the sample required by the sampling plan, and re-measure and calculate.
5.7 Determination of whether a batch can be accepted
5.7.1 ".\ rule of judgment
a) Given the upper specification limit,
if Qu=table, the batch is accepted; QuIf the control chart shows that the sample standard deviation is not in a state of statistical control, the "c" method must be converted to the "s" method. If the control chart does not show that the statistical control state is lost, but it shows that the batch standard deviation becomes smaller or larger, the batch standard deviation used should be updated at any time. The use of the control chart shall be carried out in accordance with GB/T4091. 5.2 Determination of sampling inspection method GB/T 8053—2001 This standard has three sampling inspection methods: upper specification limit, lower specification limit and double-sided specification limit. It is for users of this standard to choose according to the different specification limits required by the product standard quality. When using the double-sided specification limit "," method, the following two conditions must be met before the standard chart can be applied: UL>2.89u1-%g where 41ui--, and ui-u.2. is the quantile when the upper probability po, P, and 0.2Pa of the standard normal distribution are equal. Appendix B gives the quantile values of the priority defective product rate series used in this standard. When the sampling inspection is the "g\ method, the value of the negative value in the above conditions shall be agreed upon by the manufacturer and the user based on past experience. 5.3 Provisions on acceptable quality and limit quality Acceptable quality and limit quality shall be determined by the manufacturer and the user through consultation based on the quality requirements in the product standard. 5.4 Determination of the sampling plan
5.4.1 "g\ method
Determine the sampling plan according to the steps listed in the table
Working steps
2 "" method||tt ||Work steps
Work content
Specify quality requirements
Determine values
Determine sampling plan
Work content
Specify quality requirements
Determine sampling plan
5.5Batch composition and sample extraction
Upper specification limit
Inspect left form
Lower specification limit
Two-sided specification limit
From the recent 20 ~-25 groups of production to -s (or R) control chart data, or the recent 20 to 25 batches of sampling inspection data. Estimate by the method in Appendix B of GB/T 8054-1995. Values are given in Table 1. Detection control values are given in Table 3. Sampling plan is determined according to the steps in the table. Upper specification limit is given in Table 3. Detection point value is given in Inspection method. Lower specification limit is given in pepi and in Table 2. Detection value is given in Table 2. Bilateral specification limit is given in the same way as above (when the given conditions meet the use conditions of bilateral specification limits). The products submitted for inspection must be submitted in batches. The submitted batches may be the same or different from the investment batches, sales batches and transportation batches, but they shall consist of unit products with the same specifications and models, the same quality grades and made from the same materials and raw materials under the same process conditions. The batch size shall be agreed upon by the manufacturer and the user according to the sales situation and actual production conditions. The required samples shall be randomly drawn from the whole batch and carried out after or during the batch formation process. 5.6 Inspection and calculation of samples
The sample shall be inspected one by one according to the test, measurement or other methods specified in the product standard or order contract and other relevant documents. The inspection results shall be recorded completely and accurately. The mean and standard deviation of the sample shall be calculated. If individual abnormal data that deviates significantly from other inspection results of the sample are found during the inspection, the technical or physical reasons for the abnormal data shall be firstly found. If the reasons cannot be found, the user may make a judgment according to GB/T4883 with the consent of the user: Then, according to the nature of the abnormal data, the manufacturer and the user shall negotiate to determine whether to eliminate it. After the abnormal data is eliminated, the corresponding number of unit products shall be randomly drawn from the inspection batch again to supplement the sample required by the sampling plan, and re-measure and calculate.
5.7 Determination of whether a batch can be accepted
5.7.1 ".\ rule of judgment
a) Given the upper specification limit,
if Qu=table, the batch is accepted; Qu
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