Stepped drill structure of micronano composite coatings

• Main Authors: CHEN MING, YUE CAIXU, MA HAISHAN, WU XUEFENG, JIANG BIN
• Format: Patent
• Language: Chinese; English
• Published: 18.01.2019
• Subjects: BORING; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; TRANSPORTING; TURNING

The invention discloses a stepped drill structure of micronano composite coatings. The structure comprises a drill pipe, a connecting shaft, a drill bit, a drill handle, stepped surfaces, junk slots,bosses, stepped cutting edges, drill bit cutting edges, scrap guide grooves, a mounting base, a clamping surface and a through hole. The structure has the advantages that the stepped surfaces and thedrill bit cutting edges correspond one to one, so that drilling of the stepped drill structure is facilitated; the tops of the junk slots are correspondingly connected to the bottom ends of the scrapguide grooves one to one so that waste cut off by the drill bit cutting edges can be discharged smoothly through the junk slots; the surfaces of the stepped cutting edges and the surfaces of the drillbit cutting edges are coated with the micronano composite coatings, so that the stepped cutting edges and the drill bit cutting edges have good high-temperature oxidation resistance and good abrasionresistance; the upper surfac