基于同心扩孔钻进的分体式扩孔钻头优化设计
程伟
（晋能控股煤业集团成庄煤矿，山西 泽州 048021）
摘要： 瓦斯抽采钻孔扩孔是影响钻进除尘和高效封孔的关键因素，针对现行孔口扩孔技术存在的钻孔轨迹偏移、频
繁退钻更换钻头等问题，设计了分体式扩孔钻头。该钻头安装方便，可有效避免扩孔作业时频繁退钻和更换钻头的问题，
可以在扩孔作业中使扩孔段与其他钻孔段保持同心。对钻头的受力分析表明，扩孔钻头旋转时，其应力集中发生在截割
部，可通过设定倒角、圆角等方式来消除。
关键词： 扩孔钻进；分体式；钻头；优化设计
中图分类号： TG713     文献标识码： A     文章编号： 2095-0802-(2021)09-0138-02
Optimized Design of Separated Reaming Bit Based on Concentric Reaming Drilling
CHENG Wei
(Chengzhuang Coal Mine, Jinneng Holding Coal Industry Group, Zezhou 048021, Shanxi, China)
Abstract: Gas drainage borehole reaming is a key factor that affects drilling dust removal and efficient borehole sealing. In view
of the problems of the existing orifice reaming technology such as drilling trajectory deviation, frequent drilling-back and replacement
of the drill bit, a separated reaming bit was designed. The drill bit is easy to install, can effectively avoid the problems of
frequent drilling-back and replacement of the drill bit, and can keep the reaming section concentric with other drilling sections
during the reaming operation. The force analysis of the drill bit shows that when the reaming drill bit rotates, its stress concentration
occurs in the cutting part, which can be eliminated by setting chamfering and fillet.

 Key words: reaming drilling; separated type; drilling bit; optimized design