SC/T 5023-2002 Sampling methods and qualification criteria for fishing gear materials Synthetic fibers, threads and lines
Some standard content:
JCS 65.150
Aquatic Industry Standard of the People's Republic of China
SC/T5023.2002
Sampling methods and acceptance lot decision rules of fishing gear materialsSynthetic fiber filaments and twine2002-11-05Promulgated
Ministry of Agriculture of the People's Republic of China
Implementation on 2002-12-20
This standard is proposed by the Fisheries Bureau of the Ministry of Agriculture and is under the jurisdiction of the Fishing Gear Materials Sub-Technical Committee of the National Technical Committee for Aquatic Products Standardization. SC/T5023—2002
Drafting units of this standard: Donghai Fisheries Research Institute, Chinese Academy of Fishery Sciences, Quality Supervision and Inspection and Testing Center for Ropes and Nets of the Ministry of Agriculture
Main drafters of this standard: Le Weizhang, Guo Banhu. 1
1 Scope
Sampling methods for fishing gear materials and qualified batch determination rules
Synthetic fiber yarns and lines
SC/R 5023-2002
This standard specifies the sampling inspection procedures and qualified batch determination rules based on the number of unqualified products and the average value of physical and mechanical properties of synthetic fiber yarns and lines as quality indicators. This standard applies to batch inspection of synthetic fiber yarns and lines. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For any referenced document with a date, all subsequent amendments (excluding errors) or revisions are not applicable to this standard. However, the parties to an agreement based on this standard are encouraged to study whether the original and latest versions of these documents can be used. For any undated references, the latest version shall apply to this standard. GB/T 2828-1987 Sampling procedures and sampling tables for batch inspection by attributes GB/T 3358.1-1993 Statistical terminology - Part 1 General statistical technical training 6B/T 3358.21393 Statistical terminology: Part 2 Statistical quality control terminology 3/T 8054-1993 Statistical terminology: Part 2 Statistical quality control terminology 995 half-purchase value star mark who type sampling inspection process floating and hot sample in B/1190002000 quality management system basic research and technical spectrum SC/5001--1955 fishing gear material basic terminology 3 terms, definitions and symbols
3.1 terms and definitions
GB/T 3358,1.GB/T 3358. 2,GB/T 19000, SC/T 5001 and the following terms and definitions are applicable to the technical standard.
lot; bach
a certain number of individuals produced under the same conditions or aggregated in a prescribed manner. 3, 1, 2
batch size; balch size
the maximum number of individuals contained in the batch.
Sample
One or more individuals from a population are taken to provide information about the population and serve as a basis for possible judgments about the population.
Sample size
The number of individuals included in the sample
Sampling
The process of randomly selecting or composing a sample,
SC/T 5023-2002
Single sampling
Sampling method of taking only one sample from a batch. 3.1.7
Conformity
Meeting specified requirements.
Nonconformity
Failure to meet specified requirements.
Inspection
The act of measuring, checking, testing or measuring one or more characteristics of an entity and comparing the results with the specified requirements to confirm the conformity of each characteristic. 3.1.10
Inspection lot inaspectien lot
A certain number of individuals produced under uniform conditions and submitted for inspection. 3, 1.11
Batch inspection loimspection
Inspection carried out to determine the quality of a batch. 3.2 Symbols
The following symbols apply to this standard.
N: Batch.
n: Sample size.
n: Sample size for pre-sampling inspection.
n: Lower specification limit (minimum value) of acceptable quality (corresponding to a certain, higher probability of acceptance, which is considered satisfactory for the batch quality).
n: Lower specification limit of limit quality (corresponding to a certain, lower probability of acceptance, which is considered not to be worse for the batch quality).
n: Upper specification limit (maximum value) of acceptable quality.
n: Upper specification limit of limit quality.
X,: represents the characteristic value of the th individual, X: interpretation mean
S: sample standard deviation.
A: qualified judgment number (the maximum number of unqualified products allowed in the sample to make a batch qualified judgment) R.: unqualified judgment number (the minimum number of unqualified products allowed in the sample to make a batch unqualified judgment). [A. K,]: judgment array of a sampling plan. AQI. qualified quality level (the number of unqualified products per unit product), Q: upper specification limit quality statistic.
Qu = toe - x
(2)
Q1: lower specification limit quality statistic
: acceptance constant (a constant used to judge whether a batch is qualified or not). 4 Sampling inspection procedure
The inspection procedure specified in this standard is as follows;
Determine the inspection lot:
Determine the quality characteristics to be inspected:
Determine the type and method of sampling inspection:
X -- Fe
Specify the qualified quality, limit quality and qualified quality level; Select the sample size:
Search for sampling plan:
Draw samples:
Test the samples and calculate the results;
Determine whether the inspection lot is qualified.
5 Implementation of sampling inspection
5. 1 Determine the inspection lot
SC/T 5023—2002
Determine the inspection lot according to the needs. The products of the inspection batch are composed of synthetic fiber yarns and threads of the same manufacturer, the same material, the same specification and the same grade.
5. 2 Determine the quality characteristics to be inspected
The quality characteristics of synthetic fiber yarns and threads include appearance quality and physical and mechanical properties such as breaking strength (breaking strength), elongation at break, single line knot strength (single line knot strength), line density (comprehensive line density), etc. Determine the quality characteristics to be inspected based on the provisions of product standards or order contracts.
5. 3 Determine the type and method of sampling inspection
5. 3. 1 Use one-time sampling inspection.
5.3.2 Appearance quality is a sampling inspection of the number of unqualified products. 5.3.3 Physical and mechanical properties are average values. Measurement type "S\ method sampling inspection: Breaking strength (breaking strength), single line knot strength (single line knot strength) are lower specification limits. Sampling inspection method: a) Line density (total line density), breaking length ratio are double-sided specification limits. Sampling inspection method: b) 5.4 Qualified quality, limit quality and qualified quality level The qualified quality, upper and lower limit quality of the physical and mechanical properties of synthetic fiber yarns and yarns and the qualified quality level of appearance quality shall be clearly specified in the product standard or order contract. 5.5 Selection of sample size 5.5.1 Sample size for appearance inspection Synthetic fiber yarns and yarns are taken as a unit product. The mass of each twist and each batch specified by the product standard or order contract can be calculated into a batch. When the batch N is ≤ 1200, the sample base code is C. When the batch N is 1200, the sample maximum code is [. The sample size code is shown in Table 1 according to 5. 6.1.1 Check the sampling quantity. 3
SC/T 5023—2002
Samples are
Note: *
Table 1 Sample quantity and judgment array
Qualified quality level (AQL,)
Use the first sample under the header as the case: Use the first single sample above the header as the case Sample quantity for physical and mechanical properties inspection
When the ultimate quality specification limit is specified, the calculated value of (μ)/S or (lM)/S is given in Table 2 (using Table 4 of G[3/T5.5.2.1
80154—1995) according to 5.6.2 to obtain the sample quantity n. Table 2 Sample quantity and acceptance constant
Calculated value
(g:o)/s or (u)/s
:1.399-1. 607
1.256--1.398
1. 151-- 1. 235
1. 070--. 1. 130
1. 0G4- -1. 069
0. $48--.J.003
0. 92--0, 947
0.861-~6.901
0,826--0. 869
0. 795-- 5. 335
0.757~0. 794
0. 742~.0.766
0,719--0.711
0. 698---0. 718
0. 679--C. 697
0.662-.0.78| |tt||0.645---0.651
0. 630--0. 645
C.616-heart. 62
0.603---0.615
0. 548--0. 602
0. 505- 0. 547
0. 4?: --0. 5u4
Sample size
Acceptance constant
—0,339
—(1, 308
(-p..)/s or (p-ra /s
0.443--0.470
0. 420--0. 442
0. 400--0. 41
0. 382~0. 399| |tt||Table 2 (continued)
Grid quantity
Note: When the calculated value is less than 0.382, it can be calculated as the sum according to the following formula: 8.56382
+1.35277,—0.56207 × (calculated value) calculated value
SC/T 5023—2002
Acceptance band number
---0,225
5.5,2.2When the limit quality specification is not clearly specified in the product standard or order contract. You can use Table 3 (use Table 3 in GB/T2828-1987 as much as possible) to take the difference between the limit quality specification limit and the qualified quality specification limit. Then check the sample size n according to 5.5.2.1. Table 3 Limit Quality Specification Limits Difference from acceptable quality specification limit Quality characteristics
Breaking strength (breaking strength)
Single line knot strength (single line knot strength)
Line density (comprehensive line out)||tt ||5.6 Sampling plan for search
5.6.1 Sampling plan for appearance inspection
5.6.1.1 Sampling plan for specified qualified quality level0.021 e
0.060 μa
0,020 p
In Table 1, the sample size obtained from 5.5.1 is horizontally moved to the right, and the sample size is read in the sample size column + and then from At the intersection of the row where the sample size code is located and the column where the qualified quality level is located, read the judgment group [A,, ruler. If there is a head at the intersection, read the first head pointed to by the head along the direction of the arrow. The judgment array [A, R. 2, then the judgment array LA. , R. is located to the left, and the corresponding sample size is read in the sample column,
Note 1, according to the above search power When different sample salts are obtained for the same type of defective products, the sampling plan corresponding to the largest sample base can be used.
Note 2; the decision array [1,2] can be used. The sampling method replaces the decision array [0,1] as the answer. 5.6.1.2 When the sampling plan does not specify the acceptable quality level, if the sampling plan does not specify the acceptable quality level, the sampling plan shall be selected according to the inspection level, batch, appearance quality requirements and the category of unqualified products in the product standard or order contract. 5.6.2 Sampling plan for physical and mechanical properties inspection 5.6.2.1 The number of samples specified in the product specification or order contract shall be used as the test sample before sampling inspection. Sample size. Randomly select n samples from the inspection batch, measure the physical and mechanical properties, and then calculate the sample mean X and sample standard deviation S. Calculate (u.)/S or (ei)/S. Table 2 shows the derivative of the calculated value. From this line, we get the sample size of the batch sample plan. 5.6.2.2 When n is n, the sample size of the batch sample plan is n, and the acceptance constant is the corresponding value of the same line in Table 2. 5.6. 2.3 When nn, randomly select ten more samples from the inspection batch so that their sum is equal to nn. The sample size of the sampling plan is n. The acceptance constant is the corresponding value of the same row n in Table 21. After measuring the supplementary sample, recalculate the sample mean x and sample standard S. 5.7 Sampling
5.7.1 Sampling of appearance inspection samples
According to the selected quantity\twist(simple) in 5.5.1, adopt stratified proportional random sampling method to select the samples from the inspection Randomly select samples from boxes (packages) randomly selected from the batch.
SC/T 5023—2002
5.7.2 Samples for physical and mechanical properties inspection are selected according to the physical properties selected in 5.5.2. The samples for mechanical property test are drawn from each strand (cylinder) in 5.7.1 after the appearance test by using the layered proportional sampling method, and the part with the changed width at the end of each strand (cylinder) is deleted. , take all necessary measures to avoid changes in the sample quality:
5.8 Sample testing and calculation
5.8.1 The samples to be drawn shall be of the quality specified in the product standard, order and other relevant documents. The characteristics and their test and inspection methods are tested one by one.
5.8.2 During the appearance inspection: inspect each part (simple) of the sample and accumulate the number of unqualified products (when the unqualified products are classified, they should be counted separately) 5.8.3 After the appearance inspection, conduct the physical and mechanical properties inspection. Each test characteristic shall be tested on each sample separately. The test results shall be recorded completely and the mean and standard deviation of the samples shall be calculated. 5.8.4 Physical and mechanical properties test. If individual test results that are obviously different from other test results of the sample are found, When abnormal data is found, the technical or physical reasons for the abnormality should be found first. After the abnormal data is eliminated, a corresponding number of samples should be randomly selected from the samples that have been inspected for appearance and added to the number required by the sampling plan. After the sample size is measured, the mean and standard deviation of the sample are calculated. 6 Judgment rules
6.1 Judgment of qualified or unqualified appearance quality Based on the results of sample inspection, if the number of unqualified products found in the sample is less than or equal to the number of grid demarcations, it is judged to be qualified; if the number of unqualified products found in the sample is less than or equal to the number of grid demarcations, it is judged to be qualified; If the number of unqualified products found is greater than or equal to the number of unqualified judgments, it is judged as unqualified. 6.2 Judgment of qualified or unqualified physical and mechanical properties 6.2.1 When the following specification limits are given:
If Q,2, then it is judged as Qualified:
If, then it is judged as unqualified.
Where Q1 is calculated according to formula (1)
6.2.2 Given the double case specification limit:
Q And Q≥, then it is judged as qualified:
Qu or Qk, then it is judged as unqualified
, its tQ. is calculated according to formula (3), and Q is calculated according to formula (4). 6.3 Determination of whether the inspection lot is qualified or unqualified
If the appearance quality and various physical mechanical properties under inspection are qualified, the inspection lot is qualified; if the appearance quality or various physical mechanical properties under inspection are not qualified, the inspection lot is qualified. If one of the following items is unqualified, the inspection batch will be unqualified.)/s or (p-ra/s
0.443--0.470
0. 420--0. 442
0. 400--0. 41
0. 382~0. 399
Table 2 (continued)
Grid quantity
Note: When the calculated value is less than 0.382, it can be calculated as follows: 8.56382
+1.35277,—0.56207×(calculated value)Calculated value
SC/T 5023—2002
Accepted band number
---0,225
5. 5,2. 2 When the limit quality specification limit is not clearly specified in the product standard or order contract, the difference between the limit quality specification limit and the qualified quality specification limit can be taken from Table 3 (Table 3 in GB/T2828-1987 is used as much as possible). Then the sample size n is checked according to 5.5.2.1. Table 3 Difference between the limit quality specification limit and the qualified quality specification limit Quality characteristics
Breaking strength (breaking strength)
Single line knot strength (single line knot strength)
Line density (comprehensive line density)
5.6 Retrieval sampling plan
5.6.1 Appearance inspection sampling plan
5.6.1.1 Sampling plan for specified qualified quality level 0.021 e
0.060 μa
0,020 p
In Table 1, the sample size obtained in 5.5.1 is read to the right from the sample size column. Then read the judgment group [A,, from the intersection of the sample size code row and the specified qualified quality level column. If the intersection is a head -, read the first judgment group [A,, R] pointed to by the head along the direction of the arrow. Then read the corresponding sample size from the row where the judgment group LA., R. is located to the left in the sample column.
Note 1: According to the above search method, when different sample sizes are obtained for the same type of non-conforming products, the sampling plan corresponding to the largest sample base can be used.
Note 2: The sampling plan using the judgment group [1,2] can be used. The obtained sample of the judgment array [0,1] is used as the sampling plan. 5.6.1.2 Sampling plan without specifying the qualified quality level When the qualified quality level is not clearly specified, if the sample size and judgment array A., R. are clearly specified in the product standard or order contract based on factors such as inspection level, batch, appearance quality requirements and unqualified categories, then this provision can be a sampling plan. 5.6.2 Sampling plan for physical and mechanical properties inspection 5.6.2.1 The number of samples specified in the product standard or order contract is used as the sample size of the pre-sampling test sample. Randomly select n samples from the inspection batch, and calculate the sample mean X and sample standard deviation S after measuring the physical and mechanical properties. Calculate (u.)/S or (ei.)/S, and show the derivative of the calculated value in Table 2. The sample list 5.6.2.2 When n, the sample size of the batch sampling plan is, and the acceptance constant is the corresponding value of the same row in Table 2. 5.6.2.3 When nn, randomly select ten additional samples from the inspection batch to make them equal to the sum of n and n. The sample size of the sampling plan is n. The acceptance constant is the corresponding value of the same row as n in Table 21. After measuring the additional samples, recalculate the sample mean x and sample standard S. 5.7 Sampling of samples
5.7.1 Sampling of samples for appearance inspection
According to the selected samples of 5.5.1, samples are randomly selected from the boxes (packages) randomly selected from the inspection lot by using the stratified proportional random sampling method.
SC/T 5023—2002
5.7.2 Sampling of samples for physical and mechanical properties inspection According to the selected samples for each physical and mechanical properties inspection in 5.5.2, samples are selected from each bundle (tube) after the appearance inspection by using the stratified proportional random sampling method. The part with changed thickness at the end of each bundle (tube) is deleted and all necessary measures are taken to avoid the change of sample thickness.
5.8 Testing and calculation of samples
5.8.1 The selected samples shall be tested one by one according to the inspected quality characteristics and their test and inspection methods specified in the product standards, contract and other relevant documents.
5.8.2 During the appearance inspection: inspect each sample (section) and accumulate the number of unqualified products (when the unqualified products are classified, they should be counted separately) 5.8.3 After the appearance inspection, conduct physical and mechanical performance inspection. Test each sample according to each inspected characteristic. The inspection results should be recorded in full, and the mean and standard deviation of the sample should be calculated. 5.8.4 Physical and mechanical performance inspection. If individual abnormal data that obviously deviates from other inspection results of the sample to which it belongs are found, the technical or physical reasons for the abnormality should be found first. After the abnormal data are eliminated, the corresponding number of samples should be randomly selected from the sections (sections) that have been inspected, and the sample size required by the sampling plan should be supplemented. After the test, the mean and standard deviation of the sample should be calculated. 6 Judgment rules
6.1 Judgment of qualified or unqualified appearance quality Based on the results of sample inspection, if the number of unqualified products found in the sample is less than or equal to the grid demarcation number, it is judged as qualified; if the number of unqualified products found in the sample is greater than or equal to the unqualified judgment number, it is judged as unqualified. 6.2 Judgment of qualified or unqualified physical and mechanical properties 6.2.1 Given the following specification limits:
If Q,2, then it is judged as qualified:
If, then it is judged as unqualified.
Where Q1 is calculated according to formula (1)
6.2.2 Given the double specification limits:
Q and Q≥, then it is judged as qualified:
Qu or Qk, then it is judged as unqualified
Where tQ. is calculated according to formula (3), Q is calculated according to formula (4). 6.3 Determination of qualified or unqualified inspection lot
If the appearance quality and various physical mechanical properties under inspection are qualified, the inspection lot is qualified; if the appearance quality or various physical mechanical properties under inspection are unqualified, the inspection lot is unqualified.)/s or (p-ra/s
0.443--0.470
0. 420--0. 442
0. 400--0. 41
0. 382~0. 399
Table 2 (continued)
Grid quantity
Note: When the calculated value is less than 0.382, it can be calculated as follows: 8.56382
+1.35277,—0.56207×(calculated value)Calculated value
SC/T 5023—2002
Accepted band number
---0,225
5. 5,2. 2 When the limit quality specification limit is not clearly specified in the product standard or order contract, the difference between the limit quality specification limit and the qualified quality specification limit can be taken from Table 3 (Table 3 in GB/T2828-1987 is used as much as possible). Then the sample size n is checked according to 5.5.2.1. Table 3 Difference between the limit quality specification limit and the qualified quality specification limit Quality characteristics
Breaking strength (breaking strength)
Single line knot strength (single line knot strength)
Line density (comprehensive line density)
5.6 Retrieval sampling plan
5.6.1 Appearance inspection sampling plan
5.6.1.1 Sampling plan for specified qualified quality level 0.021 e
0.060 μa
0,020 p
In Table 1, the sample size obtained in 5.5.1 is read to the right from the sample size column. Then read the judgment group [A,, from the intersection of the sample size code row and the specified qualified quality level column. If the intersection is a head -, read the first judgment group [A,, R] pointed to by the head along the direction of the arrow. Then read the corresponding sample size from the row where the judgment group LA., R. is located to the left in the sample column.
Note 1: According to the above search method, when different sample sizes are obtained for the same type of non-conforming products, the sampling plan corresponding to the largest sample base can be used.
Note 2: The sampling plan using the judgment group [1,2] can be used. The obtained sample of the judgment array [0,1] is used as the sampling plan. 5.6.1.2 Sampling plan without specifying the qualified quality level When the qualified quality level is not clearly specified, if the sample size and judgment array A., R. are clearly specified in the product standard or order contract based on factors such as inspection level, batch, appearance quality requirements and unqualified categories, then this provision can be a sampling plan. 5.6.2 Sampling plan for physical and mechanical properties inspection 5.6.2.1 The number of samples specified in the product standard or order contract is used as the sample size of the pre-sampling test sample. Randomly select n samples from the inspection batch, and calculate the sample mean X and sample standard deviation S after measuring the physical and mechanical properties. Calculate (u.)/S or (ei.)/S, and show the derivative of the calculated value in Table 2. The sample list 5.6.2.2 When n, the sample size of the batch sampling plan is, and the acceptance constant is the corresponding value of the same row in Table 2. 5.6.2.3 When nn, randomly select ten additional samples from the inspection batch to make them equal to the sum of n and n. The sample size of the sampling plan is n. The acceptance constant is the corresponding value of the same row as n in Table 21. After measuring the additional samples, recalculate the sample mean x and sample standard S. 5.7 Sampling of samples
5.7.1 Sampling of samples for appearance inspection
According to the selected samples of 5.5.1, samples are randomly selected from the boxes (packages) randomly selected from the inspection lot by using the stratified proportional random sampling method.
SC/T 5023—2002
5.7.2 Sampling of samples for physical and mechanical properties inspection According to the selected samples for each physical and mechanical properties inspection in 5.5.2, samples are selected from each bundle (tube) after the appearance inspection by using the stratified proportional random sampling method. The part with changed thickness at the end of each bundle (tube) is deleted and all necessary measures are taken to avoid the change of sample thickness.
5.8 Testing and calculation of samples
5.8.1 The selected samples shall be tested one by one according to the inspected quality characteristics and their test and inspection methods specified in the product standards, contract and other relevant documents.
5.8.2 During the appearance inspection: inspect each sample (section) and accumulate the number of unqualified products (when the unqualified products are classified, they should be counted separately) 5.8.3 After the appearance inspection, conduct physical and mechanical performance inspection. Test each sample according to each inspected characteristic. The inspection results should be recorded in full, and the mean and standard deviation of the sample should be calculated. 5.8.4 Physical and mechanical performance inspection. If individual abnormal data that obviously deviates from other inspection results of the sample to which it belongs are found, the technical or physical reasons for the abnormality should be found first. After the abnormal data are eliminated, the corresponding number of samples should be randomly selected from the sections (sections) that have been inspected, and the sample size required by the sampling plan should be supplemented. After the test, the mean and standard deviation of the sample should be calculated. 6 Judgment rules
6.1 Judgment of qualified or unqualified appearance quality Based on the results of sample inspection, if the number of unqualified products found in the sample is less than or equal to the grid demarcation number, it is judged as qualified; if the number of unqualified products found in the sample is greater than or equal to the unqualified judgment number, it is judged as unqualified. 6.2 Judgment of qualified or unqualified physical and mechanical properties 6.2.1 Given the following specification limits:
If Q,2, then it is judged as qualified:
If, then it is judged as unqualified. bzxZ.net
Where Q1 is calculated according to formula (1)
6.2.2 Given the double specification limits:
Q and Q≥, then it is judged as qualified:
Qu or Qk, then it is judged as unqualified
Where tQ. is calculated according to formula (3), Q is calculated according to formula (4). 6.3 Determination of qualified or unqualified inspection lot
If the appearance quality and various physical mechanical properties under inspection are qualified, the inspection lot is qualified; if the appearance quality or various physical mechanical properties under inspection are unqualified, the inspection lot is unqualified.Calculate (u.)/S or (ei)/S, and find the derivative of the calculated value in Table 2. The sample size of the sampling plan is n. The acceptance constant is the corresponding value of the same row in Table 2. 5.6.2.2 When n is n, the sample size of the batch sampling plan is n. The acceptance constant is the corresponding value of the same row in Table 2. 5.6.2.3 When nn is n, randomly select ten additional samples from the inspection batch so that they are equal to the sum of the samples. The sample size of the sampling plan is n. The acceptance constant is the corresponding value of the same row in Table 2. After measuring the additional samples, recalculate the sample mean x and sample standard S. 5.7 Sampling of samples
5.7.1 Sampling of samples for appearance inspection
According to the selected samples of 5.5.1, samples are randomly selected from the boxes (packages) randomly selected from the inspection lot by using the stratified proportional random sampling method.
SC/T 5023—2002
5.7.2 Sampling of samples for physical and mechanical properties inspection According to the selected samples for each physical and mechanical properties inspection in 5.5.2, samples are selected from each bundle (tube) after the appearance inspection by using the stratified proportional random sampling method. The part with changed thickness at the end of each bundle (tube) is deleted and all necessary measures are taken to avoid the change of sample thickness.
5.8 Testing and calculation of samples
5.8.1 The selected samples shall be tested one by one according to the inspected quality characteristics and their test and inspection methods specified in the product standards, contract and other relevant documents.
5.8.2 During the appearance inspection: inspect each sample (section) and accumulate the number of unqualified products (when the unqualified products are classified, they should be counted separately) 5.8.3 After the appearance inspection, conduct physical and mechanical performance inspection. Test each sample according to each inspected characteristic. The inspection results should be recorded in full, and the mean and standard deviation of the sample should be calculated. 5.8.4 Physical and mechanical performance inspection. If individual abnormal data that obviously deviates from other inspection results of the sample to which it belongs are found, the technical or physical reasons for the abnormality should be found first. After the abnormal data are eliminated, the corresponding number of samples should be randomly selected from the sections (sections) that have been inspected, and the sample size required by the sampling plan should be supplemented. After the test, the mean and standard deviation of the sample should be calculated. 6 Judgment rules
6.1 Judgment of qualified or unqualified appearance quality Based on the results of sample inspection, if the number of unqualified products found in the sample is less than or equal to the grid demarcation number, it is judged as qualified; if the number of unqualified products found in the sample is greater than or equal to the unqualified judgment number, it is judged as unqualified. 6.2 Judgment of qualified or unqualified physical and mechanical properties 6.2.1 Given the following specification limits:
If Q,2, then it is judged as qualified:
If, then it is judged as unqualified.
Where Q1 is calculated according to formula (1)
6.2.2 Given the double specification limits:
Q and Q≥, then it is judged as qualified:
Qu or Qk, then it is judged as unqualified
Where tQ. is calculated according to formula (3), Q is calculated according to formula (4). 6.3 Determination of qualified or unqualified inspection lot
If the appearance quality and various physical mechanical properties under inspection are qualified, the inspection lot is qualified; if the appearance quality or various physical mechanical properties under inspection are unqualified, the inspection lot is unqualified.Calculate (u.)/S or (ei)/S, and find the derivative of the calculated value in Table 2. The sample size of the sampling plan is n. The acceptance constant is the corresponding value of the same row in Table 2. 5.6.2.2 When n is n, the sample size of the batch sampling plan is n. The acceptance constant is the corresponding value of the same row in Table 2. 5.6.2.3 When nn is n, randomly select ten additional samples from the inspection batch so that they are equal to the sum of the samples. The sample size of the sampling plan is n. The acceptance constant is the corresponding value of the same row in Table 2. After measuring the additional samples, recalculate the sample mean x and sample standard S. 5.7 Sampling of samples
5.7.1 Sampling of samples for appearance inspection
According to the selected samples of 5.5.1, samples are randomly selected from the boxes (packages) randomly selected from the inspection lot by using the stratified proportional random sampling method.
SC/T 5023—2002
5.7.2 Sampling of samples for physical and mechanical properties inspection According to the selected samples for each physical and mechanical properties inspection in 5.5.2, samples are selected from each bundle (tube) after the appearance inspection by using the stratified proportional random sampling method. The part with changed thickness at the end of each bundle (tube) is deleted and all necessary measures are taken to avoid the change of sample thickness.
5.8 Testing and calculation of samples
5.8.1 The selected samples shall be tested one by one according to the inspected quality characteristics and their test and inspection methods specified in the product standards, contract and other relevant documents.
5.8.2 During the appearance inspection: inspect each sample (section) and accumulate the number of unqualified products (when the unqualified products are classified, they should be counted separately) 5.8.3 After the appearance inspection, conduct physical and mechanical performance inspection. Test each sample according to each inspected characteristic. The inspection results should be recorded in full, and the mean and standard deviation of the sample should be calculated. 5.8.4 Physical and mechanical performance inspection. If individual abnormal data that obviously deviates from other inspection results of the sample to which it belongs are found, the technical or physical reasons for the abnormality should be found first. After the abnormal data are eliminated, the corresponding number of samples should be randomly selected from the sections (sections) that have been inspected, and the sample size required by the sampling plan should be supplemented. After the test, the mean and standard deviation of the sample should be calculated. 6 Judgment rules
6.1 Judgment of qualified or unqualified appearance quality Based on the results of sample inspection, if the number of unqualified products found in the sample is less than or equal to the grid demarcation number, it is judged as qualified; if the number of unqualified products found in the sample is greater than or equal to the unqualified judgment number, it is judged as unqualified. 6.2 Judgment of qualified or unqualified physical and mechanical properties 6.2.1 Given the following specification limits:
If Q,2, then it is judged as qualified:
If, then it is judged as unqualified.
Where Q1 is calculated according to formula (1)
6.2.2 Given the double specification limits:
Q and Q≥, then it is judged as qualified:
Qu or Qk, then it is judged as unqualified
Where tQ. is calculated according to formula (3), Q is calculated according to formula (4). 6.3 Determination of qualified or unqualified inspection lot
If the appearance quality and various physical mechanical properties under inspection are qualified, the inspection lot is qualified; if the appearance quality or various physical mechanical properties under inspection are unqualified, the inspection lot is unqualified.
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