高精度的孔径,使用一般镗杆加工时,生产率低,孔径尺寸不容易控制。为此,设计了一种微动镗杆结构,可在普通镗床上使用,高精度的孔径尺寸容易控制,且刀具调整方便,能节省大量辅助时间。镗杆制造也很简单,现介绍如下。镗杆主要是利用两个套装的螺纹面(螺旋方向相同的差动螺纹)在同一轴线上的相对位移,使切削刀具对镗杆产生径向移动的原理。如图1,螺母6固定在镗杆体1上,其螺距S_=0.8(右);刻度螺母5的外螺 High-precision aperture, the use of general boring bar processing, low productivity, aperture size is not easy to control. Therefore, a kind of micro-motion boring bar structure is designed, which can be used on the common boring machine. The high-precision aperture size is easy to control and the tool is easy to adjust, which can save a lot of auxiliary time. Boring bar manufacturing is also very simple, are introduced below. Boring bar is mainly the use of two sets of threaded surface (the same direction of the same spiral differential screw) on the same axis of the relative displacement of the cutting tool to the radial movement of the boring bar principle. Figure 1, the nut 6 is fixed to the boring rod body 1, the pitch S_ = 0.8 (right); scale nut 5 of the outer thread