|
FUNCTION TOLERANCE THEORY IN
INCREMENTAL GROWTH DESIGN
YANG Bo1 YANG Tao2 ZE Xiangbo1
(1. School of Mechanical Engineering,
Jinan University, Jinan 250022;
2. Singapore Technologies Dynamics Pte Ltd.,
Singapore 051627
)
|
|
Abstract: The
evolutionary tolerance design strategy and its characteristics are
studied based on the automation technology in the product structure
design. And a function tolerance de-sign theory in the process of the
product growth design is put forward, to guarantee a successful
transformation from the functional requirement to geometry constraints
between parts, and to dimension constraints finally. A mathematical
model with a correlated sensitivity function between the cost and the
tolerance is built up, in which the design cost, the manufacturing cost,
the usage cost, and the depreciation cost of the product are regarded as
the control constraint of the tolerance allocation, and with the
consideration of these costs, a multifactor-cost function to express the
quality loss of the product is applied into the model. In the
mathematical model, the minimum cost is used as the objective function,
a reasonable process capability index, the assembly function, and the
assembly quality, are taken as the constraints, while the depreciation
cost in the objective function is expressed as the discount rate - terminology in the
economics. Thus, the allocation of the dimension tolerance considering
the function and the cost in the whole lifetime of the product is
realized. Finally, a design example is used to demonstrate the
successful application of the proposed function tolerance theory in the
incremental growth design of the product.
Key words: Function tolerance theory
Incremental growth design
Functional structure design
Tolerance allocation Full life cycle design
CLC No: TP391.72
山东省自然科学基金(Y2005F26)和济南大学博士启动基金(B0538)资助项目. Received 20051107, received in revised form 20060428
|