我厂使用的支架钻模,具有体积小、同轴度高等特点,但这给找正镗孔带来了困难。图1是支架钻模的部分结构图,该钻模左、右两钻套孔中心与中间V形定位块上的孔φ8.8±0.01的同轴度为φ0.03mm,为保证这一要求,进行了工艺改进,解决了原来镗孔困难问题。改进前的镗孔工艺:用短圆棒φ8.8±0.01×27置于V形定位槽内(见图2),为便于找正工 I plant the use of stent drilling, with small size, high concentricity, etc., but it has to find a boring difficulties. Figure 1 is part of the stent structure chart, the drill left and right drill hole center and the middle of the V-shaped positioning block hole φ8.8 ± 0.01 coaxial φ0.03mm, in order to ensure this requirement , A process improvement, to solve the original boring difficulties. Before the improvement of the boring process: with a short rod φ8.8 ± 0.01 × 27 placed in the V-shaped positioning groove (see Figure 2), in order to facilitate founding workers