注塑成型塑料部件设计英文文献和翻译(7)

and part overall thickness are put under the same menu item,
namely, “Vary Thickness.” Figure 5 shows the user interface for
automatic thickness modiﬁcation. Under this environment, the
system lists all component features that has a thickness attribute.
The designers may select from this list which features to modify.
If all the listed features are selected, then overall part mod-
iﬁcation will be performed, and the overall thickness will be
assigned initially with the average thickness of all listed com-
ponent features. The starting, ending, and step values associated
with the corresponding thickness variable can then be speciﬁed.
An alternative is to specify the number of modiﬁcations and step
values. The system will then use the original value as the starting
value of the thickness.
If the designers check the ﬁeld “Search while analysis,” then
the system will automatically verify the result in terms of the
speciﬁed veriﬁcation criteria after each thickness modiﬁcation,
and terminates further thickness variation once all the veriﬁca-
tion criteria have been satisﬁed.
For other sizing modiﬁcation variables, as well as the posi-
tional modiﬁcation variables of individual component features,
the variables modiﬁcation is achieved under their respective en-
vironments. As an example, Fig. 6 shows the user interface for
automatic hole feature modiﬁcation. Using this environment, the
designers can opt to modify hole location (by using the posi-
tional modiﬁcation variables) or hole radius (by using the sizing
modiﬁcation variable) or both. For the location modiﬁcation,
the variation ranges of the corresponding positional modiﬁcation
variables should be speciﬁed such that the hole may be varied
within a user-desired region. Currently, the system only supports
the rectangular region on the hole’s proﬁle face. Hence, the po-
sitional modiﬁcation variables use only 2D coordinates of the
centre of the circle on the hole’s proﬁle face, with their ranges be-
ing speciﬁed as the starting value, ending value, and number of
variations.
After the selection of shape modiﬁcation variables and the
speciﬁcation of their ranges of variation, the designer should
ensure that the desired part mouldability and other quality meas-
uring criteria are also speciﬁed. Once this is done, the enhanced
CAD-CAE integration model is fully deﬁned.
With all the information available, the system will perform
an iterative process of modifying the CAD geometry, generat-
ing CAE analysis model (mesh) and other relevant ﬁles (such
as boundary condition ﬁles and Moldﬂow inputs ﬁle), execut-
ing Moldﬂow subroutines to perform analyses, and so on. All
these operations are performed automatically. Figure 7 shows the
ﬂowchart of this iterative process.
All the analysis results from each iteration will be put in the
same folder. The results will be processed by the system after
all iterations have been ﬁnished (unless the designers have spec-
iﬁed to verify the results after each iteration by checking the
ﬁeld “Search while analysis”). This includes extracting data from
the result ﬁles for the criteria construction variables, including
calculating standard deviation for some variables (v14–v19), cal-
culating the criteria expressions, and checking whether any of the
veriﬁcation criteria is violated.
For those part shapes whose corresponding CAE analysis re-
sults satisfy all veriﬁcation criteria, the values of their correspond-
ing objective function (from the evaluation criteria) will be com-
pared and the optimal one derived. The optimal shape in terms 注塑成型塑料部件设计英文文献和翻译(7):http://www.751com.cn/fanyi/lunwen_759.html