Parameter Diagram (P-Diagram):Pre-Requisites of creating a DFMEA
To complete the P-diagram you need to have customer requirement/ Scope of
the project completely sealed.
The attributes of the boundary diagram has to be incorporated as the ideal
output functions.
P-Diagram
Template
Introduction to
Parameter Diagram:
- P - Diagram is used to
classify the functionality associated with the intended product in the boundary
into Noise factors,Input signals, output functions,Error
states.
Why Do we need a
P-Diagram?
- When we want to design the product with minimum variations and have a robust
design we need a P - Diagram.It takes into account all the noise factors and
deviations from perfect and assign certain control parameters which are design
related minimizing the losses.
The Terms used in the P
diagram.
The factors listed in the Noise Factors are those which are out of
the control of the design engineers. The examples of noise factors
are
-
Misuse of the product by the customer
-
Extreme environmental conditions.
-
Manufacturing variability.
-
Degradation of part with time.
There are certain parameters that the design engineers can have certain
control, such as the design parameters. These are considered as the
control factors. When we consider
the
ideal functions required to produce the ideal out put functions, they pass
through the noise factors reducing the perfection of ideal output. Thus the job
of the design engineer is to apply the control parameters to reduce the impact
of the noise factors on the product and produce a near perfect ideal output.
This is called robust design.
P-Diagram Example:
Open your figure and read the explanation mentioned in this.