Inspection and Sampling Methods Guide | Standard Procedures for Specialized Companies

in the complex chain of production and distribution of products.inspection of goodsAs a key link in quality control, its importance is self-evident. For professional companies, a set of rigorous, scientific standard process is not only the cornerstone to ensure product quality, but also a powerful weapon to maintain corporate reputation and win market competitiveness. Effective inspection can identify risks in time and ensure that the products meet the established quality standards and customer expectations.

I. Confirmation of sampling plan

With reference to the internationally recognized AQL (Acceptable Quality Level) standard, the number of samples should be determined accurately by taking into consideration key factors such as the batch size of the product and the degree of inspection rigor. For example, when the batch size of the product is 1000 pieces, according to the standard of AQL 1.0, 80 pieces should be sampled, and 2 defects are allowed. Reasonable sampling plan can ensure the inspection effect at the same time, effectively control the inspection cost and time, to achieve a balance between quality and efficiency.

II. Field test execution

1. Sampling:

Strictly following the established sampling method, random sampling is carried out from the whole batch of products to ensure that each product has an equal chance of being sampled, so as to ensure that the samples can truly and comprehensively represent the quality status of the whole batch of products. For example, with the help of tools such as random number tables and computerized random sampling programs, sampling can be carried out in different scenarios such as product stacking areas and production lines to avoid sampling bias caused by human factors.

2. Visual inspection:

The appearance of the sample product is inspected in detail. Focus on whether there are scratches, deformation, color deviation and other obvious defects, while checking the integrity of the product labels and whether the packaging complies with the relevant specification requirements. For exampleElectronic Product InspectionIn the inspection, we carefully check whether there are scratches on the shell and whether the key markings are clear and complete; in the clothing inspection, we check whether the fabric color is uniform, whether the stitching is neat, and whether the trademark is sewn in the correct position, and so on. Appearance inspection can intuitively find the surface quality of the product, laying the foundation for subsequent in-depth inspection.

3. Dimensional measurements:

Using precision measuring instruments such as tape measure, micrometer, vernier calipers, etc., the key dimensions of the product, such as length, diameter, aperture, etc., are measured accurately and compared strictly with the tolerance range required by the product drawings. Taking mechanical parts as an example, their dimensional accuracy directly affects the assembly performance and overall quality of the product, and any dimensional deviation beyond the tolerance range may cause the product to be unable to be used normally or affect the life of the product. Accurate dimensional measurement is one of the important means to ensure that the product meets the design requirements.

4. Functional testing:

With the help of special test equipment, simulate various scenarios in the actual use of the product, and carry out comprehensive and in-depth testing of various functions of the product. Ensure that the product can start, run and stop normally, and that all functions meet the design expectations. For example, for smart phones, test the call function, photo function, network connection function, battery life, etc.; for household appliances, test whether the core functions such as heating, cooling, washing, drying, etc. operate normally. Functionality testing verifies the usability and functionality of a product in actual use, and is a key link in measuring product quality.

5. Performance testing:

Aiming at the characteristics of different products, choose the corresponding professional equipment to test the performance indexes of the products, such as power, efficiency, noise, durability and so on. For example, in the motor performance test, the power meter is used to measure the input power and output power of the motor to assess its efficiency; in the durability test of automotive parts, the vibration test bench is used to simulate the vibration environment of the automobile driving process, and the parts are subjected to long-time fatigue test to check their service life and reliability under the actual working conditions. Performance testing can provide an in-depth understanding of a product's intrinsic quality and performance performance, providing a more comprehensive assessment of product quality.

6. Marking of non-conforming products:

Once found in the inspection process of unqualified products, immediately using eye-catching signs to mark them, such as posting red unqualified labels, a clear distinction between qualified products and unqualified products, to prevent the unqualified products mixed into qualified products to continue to flow, to avoid the subsequent production, sales process to cause adverse effects.

III. Report issuance

Generate inspection reports

After the completion of the inspection work, the professional inspection staff based on the inspection process recorded data, photos and a comprehensive assessment of product quality, to generate a detailed, standardized inspection report. The content of the report should include the basic information of the product (such as product name, model, batch, manufacturer, etc.), inspection basis, inspection items, inspection results, description of defects and photographs, and comprehensive judgment conclusions. As an objective record and evaluation of product quality, the inspection report has important reference value for customers.

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