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Title:
ALLOY DRILL BIT FACILITATING CHIP REMOVAL
Document Type and Number:
WIPO Patent Application WO/2019/019334
Kind Code:
A1
Abstract:
Disclosed is an alloy drill bit facilitating chip removal, comprising a drill bit shank and an alloy cutter mounted on the drill bit shank.The drill bit shank comprises a cutting part (1) and a chip removal part (2), wherein a cutter groove (3) is provided on the cutting part, and a helical chip removal groove (4) is provided on the chop removal part; a first cutting face (5) and a second cutting face (6) are respectively provided at two sides of the cutter groove of the cutting part, and the first cutting face and the second cutting face are respectively connected to the helical chip removal groove; and the angle Aa of the first cutting face is 45° ± 1°, and the angle Ab of the second cutting face is 67.5° ± 1°. The alloy drill bit increases the angle of the first cutting face and the second cutting face at two sides of the cutting part, correspondingly increasing the chip removal gap between the cutting face of the drill bit and the helical chip removal groove, such that chips from cutting can be rapidly expelled via the helical chip removal groove, avoiding repeated wear on the alloy cutter and the cutting part which reduces working efficiency, and increasing the working temperature of the alloy cutter. The working efficiency and the service life of the alloy drill bit are effectively increased.

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Inventors:
LIN CHANGFANG (CN)
Application Number:
PCT/CN2017/103068
Publication Date:
January 31, 2019
Filing Date:
September 25, 2017
Export Citation:
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Assignee:
FANGDA HOLDING CO LTD (CN)
International Classes:
B23B51/02; B23B51/00
Domestic Patent References:
WO2011139960A12011-11-10
Foreign References:
CN2030121U1989-01-04
CN103084629A2013-05-08
CN2095724U1992-02-12
CN203265714U2013-11-06
CN201455362U2010-05-12
CN102834211A2012-12-19
Attorney, Agent or Firm:
HANGZHOU ZHITONG PATENT AGENCY OFFICE (GENERAL PARTNERSHIP) (CN)
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