Full
Outline
To improve the reliability of hemming processes for automotive closure panels and prevent appearance defects, the hemming processes of the hood, front door, and rear door assemblies are analyzed during the process design phase using AutoForm software and CAE numerical simulation technology. 2 rounds of hemming simulation and 1 round of simulation validation are conducted, yielding the following results: The first simulation identifies the location, extent, and severity of wrinkling in the 3 assemblies. The second simulation addresses the wrinkling defects by adjusting roller parameters and flange lengths, achieving a 100% qualification rate for both gap and flushness simulations across all 3 assemblies, with the rear door gap qualification rate increasing by 27.78 percentage points. Validation results show strong correspondence between the measured data and the first simulation: the hood gap control qualification rate is 86.21%, while the front and rear door assemblies achieved 100% gap control qualification. The overall consistency between measured and simulation results exceed 95%. The flushness qualification rates for the hood, front door, and rear door are 67.24%, 67.86%, and 97.22%, respectively. However, the consistency between measured and simulation results for the hood and front door is below 81%, primarily due to the absence of chain analysis and the inability of ideal numerical simulations to account for stamping stress and forming tolerances.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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