端面钻中心孔的钻头 end-cutting core drill
中心孔钻头
Center bit
以上为机器翻译结果,长、整句建议使用 人工翻译 。
钻头通常属于刮刀型,装备有PDC或者天然金刚石切削齿,但取芯钻头的特别之处在于钻头中心有一孔。
The bit is usually a drag bit fitted with either PDC or natural diamond cutting structures, but the core bit is unusual in that it has a hole in its center.
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