Full
Outline
Due to factors such as high pressure, water depth, and complex geological formations, the difficulty and complexity of ocean exploration are much higher than those on land, which puts high demands on the quality and performance of drill bits, and even requires customized production according to special needs. In order to provide customized drill bits in time, 3D printing technology has been innovatively applied to the production process of ocean exploration drill bits. Using spherical tungsten carbide (WC), cobalt (Co) powder, and diamond particles as raw materials, a method of selective laser melting (SLM) printing the working layer of drill bits has been proposed. By testing the density and hardness of printed samples, the printing parameters were optimized. The results show that the bulk density of printed WC-20Co-diamond stone can reach up to 13.45 g/cm3, and the hardness can reach 1 455 HV. Under the conditions of laser power of 220 W and scanning speed of 400 mm/s, high-quality molding can be achieved. The final prepared tungsten carbide cobalt based diamond drill bit sample has a good bonding between the hard alloy and the steel matrix interface. The production mode of drill bits based on 3D printing can significantly shorten the manufacturing time, produce drill bits that are suitable for various extreme environments and complex rock formations on the seabed, and timely meet the needs of printing drill bits on ocean drilling ships.
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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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