FMECA analysis content and application scope of failure mode analysis

Date：2022-05-23 16:23:08 Views：1069

FMECA (failure mode effects and criticality analysis), i.e. failure mode effects and criticality analysis method. There is a certain causal relationship between the overall fault of the system, the fault of parts and components and the system. Starting from this relationship, FMECA analyzes each possible potential failure mode of each component of the system, finds out the cause of the failure, determines the impact of the failure on system function, service performance, personnel safety and maintenance, classifies each potential failure according to the severity of the impact and the comprehensive effect of the probability of failure, and finds out the key problems, Propose possible preventive and corrective measures (such as corresponding improvement measures for design, process or maintenance activities), so as to improve the reliability of the system (or product).

Failure mode analysis has many application ranges for products from the completion of design, the development of the first sample, then production and manufacturing, to quality control acceptance, and can be used in three stages.

Failure mode analysis in the first stage design stage

1. Based on the designed concept, review the structure, functional problems and prevention strategies of the system item by item.

2. Review the problem points and prevention strategies of the structure and function of the parts.

3. Review the possible problems among several parts groups or parts groups.

Failure mode analysis of the second stage test plan

1. Review the selection of test objects and the purpose and method of the test.

2. Effective application of test method and review of new evaluation methods.

3. Tracking and continuous application of effectiveness after the test.

FMEA in the third process stage

1. In the process design stage, it is predicted to be a review of defective processes and prevention strategies.

2. In the process design stage, in order to prevent the occurrence of defective products, the selection of characteristics that must be managed or the review of management priorities.

3. Whether there are benefits to be tracked within a specified period.

In addition to the above scope, users can also use this analysis technique in appropriate places. However, in application, it should be noted that:

1. Failure mode information

If we can collect the relevant information of the target product, process and function in advance, it will be of great help to the analysis. When collecting data, we should be sure not to give up the possible factors. If it is really difficult to judge, it should be discussed and determined by the ad hoc group.

2. Sufficient analysis and review personnel

In order to prevent the error caused by the deviation in the analysis, and to collect the benefits of thinking, a certain number of people are necessary. As for how many talents are enough, it depends on the characteristics of the analysis object or the ability of the company. For this point, it is necessary to consider the representativeness of all levels in terms of quantity and quality. If each functional organization has professional and technical personnel and managers, it can be more comprehensive.

For enterprises that introduce failure mode analysis for the first time, it may be a feasible practice to hire external consultants or mentors for personnel training and implementation assistance.

3. Development time integration

Since the vast majority of personnel conducting such analysis have established original tasks. On the one hand, they should be able to carry out daily work and on the other hand, they should be able to carry out smooth analysis. Therefore, the proper arrangement of development time is very important. They can conduct failure mode analysis by special work organization, which can obtain a more favorable division of labor.

At the same time, it is also necessary to specify the review object of design review and define who has the right to make the final decision.

4. Follow up the results

The tracking date must be set for any project work. It is better to take the tracking operation as a part of the analysis work and arrange it in the work plan. Of course, the person in charge of scheduling the work should also arrange the person in charge of the tracking work. It is best to regularly submit a report on the tracking situation to the CEO of the company.

Project progress is an important indicator to check the achievement of failure mode analysis. A set of modular analysis process is established according to the implementation steps described later.

While discussing the economic benefits that failure analysis can bring, enterprises should not only see the economic benefits of immediate, specific, existing cases or products, but also consider the long-term, temporarily insignificant and economic benefits brought by the improvement of product quality of the whole enterprise. Therefore, the failure analysis of electronic products is an important link to promote the overall optimization of the whole enterprise, occupy the leading position in the industry and promote the development of the whole industry. Failure analysis can not only help enterprises improve product quality, improve market influence and bring economic benefits, but also bring huge economic benefits to the whole national economy.