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Quality sampling method
1 General
1.1 development purposes
In order to save the cost of inspection and control the quality of raw materials and finished products, this method is formulated.
1.2 scope of application
The company quality control unit performs various sampling inspection work, being executed.
1.3 responsibility and authority
(1) the product management department shall be responsible for drafting, revising and abolishing the drafting of the present measures.
(2) the general manager shall be responsible for the formulation, amendment and approval of the present measures.
2 job requirements
2.1 sampling plan
The quality inspection of the company is to use GB2828 (equivalent to MIL-STD-105D) a single sampling, the general inspection level II and special inspection S-2 level.
2.2 test principle
(1) the sampling plan for the quality inspection of the company shall be used in a special way and shall be used in a single normal inspection manner.
(2) the inspection shall be changed by the director of the goods and the goods of the competent department of the goods and the competent department of the goods shall be changed.
2.3 test mode conversion instructions
2.3.1 conversion approval process
(1) an application for the examination of the application for the examination of the normal inspection by the quality control department, the Department of quality control (including) is approved by the competent department of quality control.
(2) the application for the relaxation or recovery of the normal inspection by the cross examination unit is approved by the competent department of the product (s).
(3) by means of a product of the competent department of the goods (including), the person in charge of the product is used to increase the quality of the product and to relax or resume normal inspection.
2.3.2 conversion from normal inspection to the condition of the examination
In the normal inspection process, continuous inspection of ten batches (not including the two inspection inspection group), five batches of more than rejected (rejection), QC department may apply to strict inspection.
2.3.3 by the addition of strict inspection to the conversion of normal conditions
In the process of adding strict inspection, the ten batch of continuous inspection are judged qualified (Yun Shou), the product can be used to test the normal mode.
2.3.4 conversion from normal inspection to the condition of the examination
In normal inspection process, the continuous inspection of the ten batch are all qualified (Yun Xu), and in the sample, the absence of major defects (MA) and fatal defects (CR), the product tube or the inspection unit can be proposed to relax the application for inspection.
2.3.5 by the relaxation of the inspection of the conversion to the normal test conditions
Relax in the inspection process, as long as there are a number of rejected (rejection), QC personnel shall be submitted to the QC manager returned to normal inspection.
2.4 total inspection time
In case of any of the following circumstances, the goods shall be approved by the manager of the product management department (including), and shall be used in full:
(1) the delivery material (Cheng Pin) has a fatal flaw (CR).
(2) the quality of a security flaw or problem.
(3) in the examination and processing of the storage, a lot of bad.
(4) the quality is very unstable.
(5) other conditions necessary for the implementation of the full inspection.
Incoming inspection requirements
1 General
1.1 development purposes
The company is to control the procurement of material, outsourcing processing quality, so that it meets the design specifications and quality standards, the development of the provisions of this.
1.2 scope of application
Where the company's procurement of materials, outsourcing processing materials or parts of the company's self-made parts are applicable to the provisions of this.
1.3 responsibility and authority
(1) the product management department shall be responsible for drafting, revising and abolishing the drafting work of the provisions of this regulation.
(2) the general manager shall be responsible for the formulation, amendment and repeal of approval.
2 inspection requirements
2.1 sampling plan
Single sampling plan based on GB2828 (equivalent MIL-STD-105D).
3.2 quality characteristics
General characteristics and special characteristics of quality characteristics
2.2.1 general characteristics
One of the following conditions shall belong to the general characteristics:
(1) inspection of the work easily, such as the appearance of characteristics.
(2) quality characteristics have a direct and important influence on the quality of the product, such as electrical properties.
(3) the variation of quality characteristics.
2.2.2 special features
Is a special feature of one of the following conditions:
(1) inspection of a complex, time-consuming, or high cost of inspection.
(2) quality characteristics can be judged by other characteristics of the test.
(3) the variation of the quality characteristics of the small.
(4) destructive test.
2.3 inspection level
(1) the general characteristics of the general II level by GB2828 normal single sampling.
(2) the special characteristics of the special characteristics of the GB2828 normal single sampling S-2 level.
2.4 defect level
Sampling inspection found that the defects of the quality standards, known as the defect, the level of the following three:
(1) fatal flaw (CR)
The safety of life or property that can or may harm the user, the carrier of the product, called a fatal flaw, or a serious defect, said CR.
(2) major defects (MA)
Can not achieve the purpose of the use of the defect, known as the main defect, or heavy defects, said MA.
(3) minor defects (MI)
Does not affect the use of the purpose of the defect, known as secondary defects, or minor defects, said MI.
2.5 acceptance level (AQL)
2.5.1AQL definition
AQL is the Quality Leval Acceptable, which is the upper limit of the quality of the acceptable quality, also known as the acceptance of quality level, referred to as the acceptable level.
2.5.2 acceptable level
In the company of the material inspection, the level of the defect level of the incoming material acceptable level of:
(1) CR defect, AQL=0.
(2) MA defect, AQL=1.0%.
(3) MI defect, AQL=2.5%.
Feeding and receiving level should be strict or equivalent to the customer's acceptance of the finished product level, therefore, such as the quality of the products of the customer's acceptance standards, should be based on customer standards.