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对于某些无法在车床上加工的内螺纹,可在铣床或镗床上,用内螺纹镗头加工。内螺纹镗头的结构及工作原理如图所示。在机床导轨或台面上装一靠铁,用以固定拨杆20。当插销机构12的插销插入连接平盘13的孔内时,由于拨杆20固定,螺母8不能转动。刀架轴2通过柱销3使之旋转,并以螺旋付螺距作轴向移动。若在滑动刀架15上紧固一刀杆16与螺纹刀头,就可按所选螺旋付螺距加工内螺纹。
For some can not be processed in the lathe internal thread, in the milling machine or boring machine, with internal thread boring head processing. Internal thread boring head structure and working principle as shown. In the machine rail or table mounted on a rail, to fix the lever 20. When the latch of the latch mechanism 12 is inserted into the hole of the connecting flat plate 13, the nut 8 can not rotate because the lever 20 is fixed. The carriage shaft 2 is rotated by the pin 3 and moved axially with the helical pitch. If the slide holder 15 is secured to a razor 16 and a thread cutter head, the thread may be machined to the selected thread pitch.