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MA/RS HOME->MA/RS ROADMAP->SOVA->MODELING->QUALTIY
DRIVEN SEQUENCE |
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Title:Quality-driven
Sequence Planning and Line Configuration Selection for
Compliant Structure Assemblies |
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Sponsor:
NSF, NIST-ATP |
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Collaborators:
R. Kumar, J. Kong, Y. Zhou, S.
Gogoneni (Dimensional
Control Systems) |
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Team: H.
Wang and
D. Ceglarek |
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Description: |
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Assembly sequence planning is an application of
SOVA assembly modeling framework. Most previous research has
investigated assembly sequence planning under the assumption
that parts are manufactured accurately at their nominal
dimensions. In fact, dimensional variation is introduced into
virtually every design when manufactured. Different sequences
will establish different ways of variation propagation and
hence, result in different variations on the final product.
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A new method for quality-driven sequence
planning (Q/SP) considers selection of assembly line
configurations and sequences to obtain a set of robust
assembly systems which are less sensitive to part and tool
variations. The presented Q/SP method is based on three steps:
(1) Sequence generation for predetermined line configurations
using k-piece mixed-graph representation of assembly; (2)
Dimensional quality model of variation propagation for
assembly processes with compliant parts; and (3) Evaluation of
sequences based on the multivariate process capability index.
The methodology is illustrated using an industrial case study
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| Industry Case study |
| The assembly process
of the SUV side aperture is used to illustrate the evaluation
results of sequence and line configuration. Three line
configurations shown below are evaluated and the results of their
evaluation is shown. |
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The results show that assembly
sequences as well as line configurations affect significantly
product dimensional quality. Additionally, for each line
configuration there exist sequences which produce the best product
quality. As the result shows, the best-quality happens at certain
sequences of all the three line configurations: (i) the sequence
(((v1 v2) v3) v4) of line 1, (ii) the sequence ((v1 v2 v3) v4) of
line 2, and (iii) the sequence ((v1 v2) v3 v4) of line 3.
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