钻头和扩孔钻是一样的东西，不过是发挥的作用不同罢了，都是利用切削刃进行钻削；钻头钻底孔，扩孔钻把钻头钻的底孔加以扩大。
ach 中文名称：扩孔钻 英文名称：Expanding drill 中文名称：铜柄刀 英文名称：Copper handle knife 中文名称：碳钢 英文名称：Carbon steel 中文名称：镗刀 英文名称：Boring
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... crank auger 曲柄钻,手摇钻... expanding auger 扩孔钻 auger stem 钻杆,螺旋钻杆...
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扩孔钻头 reamer bit ; expanding bit ; broaching bit ; counterbore cutter head
平底扩孔钻 [机] counterbore drill
骨扩孔钻 bone reamer ; osseous reamer ; osseous s reamer
套式扩孔钻 shell drill ; shell core drill ; shell core drill shell drill
直槽扩孔钻 fluted drill
直柄扩孔钻 parallel shank core drill ; Core drills with parallel shanks
锥柄扩孔钻 taper shank core drill ; core drill with taper shank
锥柄三刃扩孔钻 taper shank three-edge hole-dilating drill
四槽扩孔钻 groove core drill ; groovedrill
介绍精扩孔钻的实践参数、特点及刃磨要领。
The practice of pure hole drilling parameters, the main characteristics and grinding were introduced.
本实用新型是一种扩孔钻套，属于加工刀具。
The utility model relates to a hole enlarging drill bushing, which belongs to a processing knife tool.
应该是因为该处由较大直径的扩孔钻导致的骨皮质较薄。
This was thought to be due to the thin cortical walls as a result of the larger reamer diameter in this group.
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