THE DFQM LOGIC

BASICS OF THE QM ASSESSMENT SCHEME

Our research indicates that there is a general relationship between the occurrence of some manufacturing defects and the nature of a product's design.

Based on these relationships the overall logic for the DFQM procedure was developed. This logic may be summarized as follows:

The quality manufacturability of a product is an aggregate representation of several classes of defects.
The occurrence of these defects is influenced by several factors that are inherent in the product's design.
While the complete list of factors & defects is quite large, a shorter list of the most common and dominant factors & defects can be identified.
The DFQM method assumes that each of the identified factors can be quantified, and further a generally applicable function relating each factor to the likelihood of each defect can be developed.

The DFQM logic is synthesized into five elements or building blocks

Class of Defects - A general category of defects commonly found in assembled products. These defects are related to the processes by which the product is assembled.
Specific Defects - A more detailed description of particular defects within each defect class. Typically, specific defects belonging to the same class will be similar in their overall effect on the quality of the product, and their general nature.
Influencing Factor - A feature of the design or assembly process which can lead to one or more of the above defects. Factors may relate to the physical attributes of the design, or the manufacturing process.
Factor Variables - A detailed variable that represents a particular facet of a influencing factor. Typically, each factor variable will influence one or more specific defects.
Error Catalyst - A design-assembly situation which promotes the occurrence of defects. Error catalysts are the building blocks in the derivation of the DFQM index.

Maintained by Dr.Das Sanchoy

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