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In order to compare the lubrication properties of the four pre-lubricants, this paper studies the influence of friction coefficient on the material thinning rate in the bulging process by numerical simulation. The results show that under the same other conditions, the smaller the friction coefficient is, the smaller the sheet thinning rate is, that is to say the better the lubrication effect is in the bulging test, the smaller the forming limit height of the sheet. Based on the numerical simulation results, four kinds of pre-lubricants are used to carry out bulging test to compare the lubrication properties. The results show that lubricating oil A has the best lubrication properties, followed by lubricating oil D and B, and lubricating oil C has the worst lubrication properties. In addition, it is found that lubricating effect of lubricating oil B weakens with the increase of coating amount, whereas that of lubricating oil C and D increases first and then decreases with the increase of coating amount.
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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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