Basic knowledge of electronic failure analysis potential failure modes and consequences analysis of products

Date：2022-05-18 15:34:50Views：877

The three elements of pfema are quantitative risk assessment, listing causes / mechanisms and looking for preventive / improvement measures. PFMEA: Process FMEA, which is used for reliability analysis in process design. The analysis objects are new products / processes and changed products / processes. Generally, PFMEA is used before the preparation of production tooling until the product is officially put into production. After putting into production, PFMEA should be continuously updated according to the changes of production process. In order to help you have an in-depth understanding, this paper will summarize the relevant knowledge of product potential failure mode and consequence analysis. If you are interested in what this article will cover, read on.

PFMEA is commonly used to analyze the causes of failure from five aspects: human, machine, material, method and environment. Failure reason refers to the occurrence of failure mode caused by a process problem, so the analysis reason is to list each possible cause of the failure mode as far as possible, and get corresponding improvement measures and prevention and control methods.

PFMEA is the abbreviation of "process failure mode and effects analysis", which means "process failure mode and effects analysis". This corresponds to DFMEA (design failure mode and effects analysis). The focus is to find out the failure causes affecting the process. Therefore, from the perspective of failure modes affecting process, the man-machine, material and method ring shall be deeply excavated in five aspects to find out the causes.

Person:People refer to workers, operators or other relevant personnel. It mainly analyzes whether human causes may lead to the failure mode? For example, improper operation of personnel, incorrect assembly of parts, unreasonable taking and placing methods, wrong use of wrong parts, failure to follow the operation instructions, insufficient proficiency, etc., may lead to this failure in the process.

Machine:Machine refers to all machines, equipment, fixtures and other machines that participate in the whole process and have potential risks leading to this failure mode. For example, whether the parameters of the machine will be lost, the machine will be out of control, misoperation, not foolproof, automatic control failure and so on.

Material:Material refers to the materials involved in the whole process, including materials directly used for production and materials indirectly supporting auxiliary production. Direct material refers to whether the incoming materials have problems, whether the parts meet the tolerance, and whether there will be defective products mixed to lead to the failure mode of the process? Indirect materials refer to, for example, whether the auxiliary materials and oil required by the machine will lead to machine failure due to the problems of auxiliary materials, so as to produce the failure mode of process.

Method:Method refers to the operation method of the machine, the manufacturing method of production, the operation method of personnel, etc. For example, the description of the operation manual is inaccurate and ambiguous, or the formulation of the operation method is wrong, the wi definition of the pipeline is wrong, etc. all the methods that may lead to the process failure mode need to be analyzed.

Ring:Ring refers to the environment where the process is located, such as light, lighting, temperature and humidity, noise, dust, etc. will these surrounding environments have hidden dangers for the process, resulting in a certain failure mode.

This article is introduced here. I hope it will be helpful to you. When the failure causes are comprehensively analyzed according to the five aspects of man-machine, material, method and environment, the corresponding improvement measures and subsequent corresponding preventive measures can be given according to the corresponding causes.