1, quality function deployment
Quality function deployment is one of the most important methods that must be applied to implement design for six sigma. In order to ensure that the design target value is completely consistent with the customer's requirements and the specification of quality characteristics meets the customer's needs, in the first stage of design for six sigma, QFD method will be used to analyze and determine the customer's needs (design target value) and initially determine the specification limit of quality characteristics. When defining products, it is necessary to apply QFD technology to transform customers' needs into design requirements scientifically, and to determine key quality characteristics CTQ and bottleneck technology. It can also play an auxiliary role in the later stage of product development.
2.TRIZ method
The basic problems and contradictions (called system conflicts and physical contradictions by TRIZ) faced by a large number of inventions are the same, but the technical fields are different. TRIZ system is developed based on this idea, which breaks the psychological inertia and knowledge bondage of our thinking, avoids blindness and limitations in the process of innovation, and points out the direction and way to solve problems.
3. Advanced experimental design
In the product development stage, we often encounter more complicated situations when designing DOE. For example, the parameters in the prediction model are non-linear structures, which can't be competent with general linear modeling methods, or even if the construction is successful, it will bring inevitable large errors; In the deterministic process with only systematic deviation and no random error, how to transform limited resources into more effective experimental schemes and fully reveal the behavioral characteristics of factors within the specified range is particularly prominent; Engineering problems are ever changing. How to set the type and level of factors according to the actual situation is no longer something that traditional design schemes can't take into account. At the same time, it can balance the contradiction between model accuracy and resource budget, and quickly find an economical and feasible experimental scheme ... These problems need to be solved with the help of more advanced experimental design theories and methods (such as nonlinear design, space filling design and customized design).
Step 4 simulate
Simulation, also known as simulation, is a process of establishing a mathematical model or a logical model of a system or a decision-making problem, and conducting experiments with this model to gain an understanding of the system behavior or help solve the decision-making problem.
The analyst can evaluate the model without establishing or actually completing the proposed system or decision, or test the model without disturbing the existing system;
② It is generally easier to understand than many other analytical methods.
5. Tolerance design
Generally, when the quality grade of each component is low and the parameter fluctuates widely, the tolerance design is carried out after determining the optimal level combination of controllable factors. The basic idea of tolerance design is: according to the contribution (influence) of the fluctuation of each parameter to the product quality characteristics, from the economic point of view, smaller tolerances should be given to the parameters with greater influence (such as replacing the parts with lower quality grades with parts with higher quality grades).
6, design failure mode and impact analysis
DFMEA is suitable for failure mode and impact analysis in product design stage, and finds out all kinds of potential quality problems and failure modes that affect product quality and reliability, as well as their harmfulness and reasons (including design defects, process problems, environmental factors, aging, wear and processing errors, etc.). After taking corrective measures in design, process and operation, the product quality and anti-interference ability are improved.
7. X-oriented design
The realization of product quality characteristics and the formation of cost are also influenced and restricted by many factors other than structural design scheme, such as technology, manufacturing, assembly, inspection, use and maintenance, guaranteed service, development cycle and cost control. Therefore, in order to improve customer satisfaction in the whole product life cycle, it is necessary to design the X family (DFX) according to various related elements of X. The so-called DFX is essentially to design the whole product life cycle.