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To explore the application of micro foaming blow molding technology in automotive air ducts,this paper adjusts the blowing presstre and temperature in the production process to obtain qualified samples and rerifies their material properities and product performance. The results show that, compared with the unfoamed air duct, air duct parts with foaming ratio of 10% experience significant degrease of tensile and bending performance, with performance degradation up to 40%. In the foaming ratio range between 10% to 30%, with the increase of foaming ratio, the tensile and bending performance of the air duct material gradually decrease, but compared with tensile strength, the bending strength decreases more slowly. The air duct with foaming ratio of 30% not only meets the appearance requirements, but also meets the product performance requirements for automotive products. At the same time, by trial production of air ducts with different structures, the design points of microfoaming air duct are summarized.
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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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