发明名称 A STRONG HIGH PERFORMANCE TWIST DRILL
摘要 <p>A strong high performance twist drill which aims at providing a high performance twist drill to solve the existing problems effectively. The twist drill can reduce the change in value of the rake angle, increase the value of the rake angle especially at the position approaching the drill core, and improve the cutting condition. The twist drill comprises a shank and a working part. Said working part comprises a cutting part and a guiding part. Said cutting part includes a rake face, a relief face, a main cutting edge and a chisel edge; said guiding part includes rear groove edges and flutes; wherein, said main cutting edge tilts towards the drill core from outside to inside; the angle between the main cutting edge and the center vertical line at the cross section is in the range of 3-25°; said main cutting edge intersects with back groove face at the narrow chisel edge; the length of the narrow chisel edge is in the range of 0.03-0.5mm; and the rake angle at the drill core is positive.</p>
申请公布号 EP2027957(B9) 申请公布日期 2012.06.13
申请号 EP20060752927 申请日期 2006.06.09
申请人 JIANGSU TIANGONG TOOLS CO., LTD. 发明人 ZHU, XIAOKUN
分类号 B23B51/00;B23B51/02 主分类号 B23B51/00
代理机构 代理人
主权项
地址