Dongguan Kaiyi Technology Co., Ltd.
Contact number: 18157981781
Quality inspection is a very important and common control method in quality management. It detects failure modes to prevent non-conforming products from flowing into the next step. Kaiyi Technology Co., Ltd. takes ISO9001-2015 and ISO13485-2016 as the quality assurance standards. It is a professional mask production base, and each production process has professional inspectors to conduct inspections. Well-equipped professional laboratories provide quality assurance for product delivery.
1. Classification according to the order of the production process
Definition: The inspection performed by the enterprise on the purchased raw materials, purchased parts, outsourcing parts, supporting parts, auxiliary materials, supporting products, and semi-finished products before they are put into storage.
Purpose: To prevent non-conforming products from entering the warehouse, to prevent the use of non-conforming products from affecting product quality and affecting normal production order.
Requirements: A full-time incoming inspector shall perform inspections in accordance with inspection specifications (including control plans).
Classification: Including the first (piece) batch of sample incoming inspection and batch incoming inspection.
Definition: Also called process inspection, it is the inspection of the product characteristics produced in each manufacturing process during the product formation process.
Purpose: to ensure that the unqualified products of each process cannot flow into the next process, prevent the continued processing of the unqualified products, and ensure the normal production order. Play a role in verifying the process and ensuring the implementation of process requirements.
Requirements: A full-time process inspector shall conduct inspections in accordance with the production process flow (including control plan) and inspection specifications.
Classification: first inspection; round inspection; final inspection.
Definition: Also known as finished product inspection, finished product inspection is a comprehensive inspection of the product after the end of production and before the product is put into storage.
Purpose: To prevent substandard products from flowing to customers.
Requirements: The quality inspection department of the enterprise is responsible for the inspection of finished products, and the inspection should be carried out in accordance with the regulations of the finished product inspection guide. The inspection of large quantities of finished products is generally carried out by statistical sampling inspection. For products that have passed the inspection, the inspector shall issue a certificate of conformity before the workshop can go through the warehousing procedures. All finished products that fail to pass the inspection shall be returned to the workshop for rework, repair, downgrading or scrapping. Products that have been reworked and repaired must be inspected again for the entire project. Inspectors must make inspection records for reworked and repaired products to ensure that the product quality is traceable.
Common finished product inspection: full-size inspection; finished product appearance inspection; GP12 (customer special requirements); type test, etc.
2. Classification by inspection location
The products to be inspected are concentrated in a fixed place for inspection, such as an inspection station.
On-site inspection is also called on-site inspection, which refers to inspection at the production site or where the product is stored. General process inspection or large-scale product inspection adopts on-site inspection.
Inspectors shall conduct roving quality inspections of manufacturing processes at the production site. The inspector shall conduct inspections in accordance with the inspection frequency and quantity specified in the control plan and inspection instructions, and keep records.
The process quality control point should be the focus of the itinerant inspection. The inspector shall mark the inspection result on the process control chart.
When it is found that there is a problem with the quality of the process in the patrol inspection, on the one hand, it is necessary to find out the cause of the process abnormality with the operator, take effective corrective measures, and restore the process control state; Before inspection, all processed workpieces are fully inspected retrospectively to prevent unqualified products from flowing into the next process or the hands of customers.
3. Classification by inspection method
Physical and chemical inspection refers to methods that mainly rely on measuring tools, instruments, meters, measuring devices, or chemical methods to inspect products and obtain inspection results.
Sensory inspection is also called sensory inspection, which relies on human sensory organs to evaluate or judge the quality of products. For example, the shape, color, smell, scars, and aging degree of the product are usually inspected by human sense organs such as vision, hearing, touch or smell, and judge whether the product quality is good or bad or qualified.
Sensory testing can be divided into:
Hobby-type sensory inspection: such as wine tasting, tea tasting, and product appearance and style identification. It is necessary to rely on the rich practical experience of the inspectors to make correct and effective judgments.
Analytical sensory inspection: such as train inspection and equipment inspection, which rely on the feeling of hands, eyes, and ears to judge temperature, speed, noise, etc.
Trial use identification: Trial use identification refers to the inspection of the actual use effect of the product. Observe the applicability of the product's use characteristics through actual use or trial of the product.
Fourth, according to the number of products to be inspected classification
Full inspection is to inspect all the products submitted for inspection one by one according to the specified standards.
It should be noted that even if all inspections are due to wrong inspections and missed inspections, it is not guaranteed to be all qualified.
Sampling inspection is based on a pre-determined sampling plan, taking a specified number of samples from the batch for inspection to form a sample, and inferring that the batch is qualified or unqualified through the sample inspection.
It is mainly for products that have passed the product quality certification of the authoritative department or trustworthy products to be exempted from inspection when they are bought, and whether they are accepted or not can be based on the supplier's certificate or inspection data.
When implementing exemption from inspection, customers often have to supervise the supplier's production process. The supervision method can be carried out by dispatching personnel to station or requesting control charts of the production process.
V. Classification of data by quality characteristics
The measurement value inspection needs to measure and record the specific values of the quality characteristics, obtain the measurement value data, and compare the data value with the standard to judge whether the product is qualified.
For the quality data obtained by the measurement value inspection, statistical methods such as histograms and control charts can be used for quality analysis, and more quality information can be obtained.
In order to improve production efficiency in industrial production, limit gauges (such as plug gauges, calipers, etc.) are often used for inspection. The quality data obtained is count value data such as the number of qualified products and the number of non-conforming products, and specific values of quality characteristics cannot be obtained.
6. Classification according to the condition of samples after inspection
Destructive inspection refers to the inspection results (such as the blasting ability of shells, the strength of metal materials, etc.) only after the sample being inspected is destroyed. After the destructive inspection, the inspected sample completely loses its original use value, so the sample size of the sample is small, and the inspection risk is high.
Non-destructive inspection refers to the inspection in which the product is not damaged and the quality of the product does not change substantially during the inspection process. Most inspections, such as the measurement of part dimensions, are non-destructive inspections.
7. Classification by inspection purpose
Production inspection refers to the inspection carried out by the production enterprise at all stages of the entire production process of product formation, with the purpose of ensuring the quality of the products produced by the production enterprise.
The production inspection implements the organization's own production inspection standards.
Acceptance inspection is the inspection performed by the customer (demand side) in the acceptance of the products provided by the production enterprise (supplier). The purpose of acceptance inspection is for customers to ensure the quality of accepted products.
Acceptance inspection and acceptance criteria after confirmation with the supplier.
Supervision and inspection refers to the random inspection and supervision and inspection of the market conducted by independent inspection agencies authorized by the competent government departments at all levels, according to the plan formulated by the quality supervision and management department, to extract products from the market or directly from the production enterprises.
The purpose of supervision and inspection is to carry out macro-control on the quality of products put on the market.
Verification inspection refers to an independent inspection agency authorized by the competent government departments at all levels to take samples from the products produced by the enterprise, and pass the inspection to verify whether the products produced by the enterprise meet the requirements of the implemented quality standards. For example, the type test in the product quality certification is a verification test.
Arbitration inspection means that when there is a dispute between the supplier and the buyer due to product quality, the independent inspection agency authorized by the competent government departments at all levels will take samples for inspection and provide the arbitration agency as the technical basis for the award.
8. Classification according to supply and demand relationship
The first party inspection refers to the inspection carried out by the manufacturer itself on the products it produces. The first party inspection is actually the production inspection carried out by the organization itself.
The user (customer, demander) is called the second party. The purchaser's inspection of the purchased products or raw materials, purchased parts, outsourced parts and supporting products is called the second party inspection. The second party inspection is actually the inspection and acceptance carried out by the supplier.
The independent inspection agency authorized by the competent government departments at all levels is called the third party. Third-party inspections include supervisory inspections, verification inspections, arbitration inspections, etc.
9. Classification by inspectors
Self-inspection refers to the inspection of the products or parts processed by the operators themselves. The purpose of self-inspection is that the operator understands the quality status of processed products or parts through inspection, so as to continuously adjust the production process to produce products or parts that fully meet the quality requirements.
Mutual inspection is the mutual inspection of processed products by operators of the same type of work or upper and lower procedures. The purpose of mutual inspection is to detect quality problems that do not meet the requirements of the process regulations in time through inspections, so that corrective measures can be taken in time, so as to ensure the quality of processed products
Special inspection refers to the inspection conducted by personnel engaged in quality inspections who are directly led by the quality inspection agency of the enterprise.
X. Classification according to the components of the inspection system
Batch inspection refers to the inspection of each batch of products produced in the production process. The purpose of batch-by-batch inspection is to judge whether a batch of products is qualified or not.
Periodic inspection is an inspection carried out at a certain time interval (quarterly or monthly) from a certain batch or several batches that have passed the inspection batch by batch. The purpose of cycle inspection is to determine whether the production process within the cycle is stable.
Periodic inspection and batch-by-batch inspection constitute the complete inspection system of the enterprise. Periodic inspection is an inspection to determine the effect of system factors in the production process, and batch inspection is an inspection to determine the effect of random factors. The two are a complete inspection system for putting into production and maintaining production. Periodic inspection is the prerequisite for batch-by-batch inspection, and there is no batch-by-batch inspection for production systems that do not have periodic inspections or fail periodic inspections. Batch-by-batch inspection is a supplement to periodic inspection. Batch-by-batch inspection is an inspection to control the effects of random factors on the basis of eliminating the effects of system factors through periodic inspections.
In general, batch-by-batch inspection only examines the key quality characteristics of the product. The periodic inspection should check all the quality characteristics of the product and the influence of the environment (temperature, humidity, time, air pressure, external force, load, radiation, mildew, moth, etc.) on the quality characteristics, even including accelerated aging and life tests. Therefore, the equipment required for periodic inspection is complicated, the cycle is long, and the cost is high, but periodic inspection must not be avoided for this reason. When an enterprise does not have the conditions to conduct periodic inspections, it can entrust inspection agencies at all levels to do periodic inspections on their behalf.
11. Classification according to the effect of the test
The deterministic inspection is based on the quality standard of the product, and the conformity judgment of whether the product is qualified or not is judged through inspection.
Informational inspection is a modern inspection method for quality control using the information obtained from the inspection.
The cause-seeking test is to find out the reasons (cause-seeking) that may produce unqualified in the design stage of the product, and to design and manufacture error-proofing devices in a targeted manner, which is used in the production and manufacturing process of the product to prevent unqualified The production of goods.