Study on an effective method for de-burring inner burrs of cross holes

本课题的主要目的是提出一种新的有效的去毛刺方法，适用于钻削十字孔交点等曲面时产生的内毛刺。根据所提出的原理开发了一些去毛刺装置的原型并进行了仔细的测试。从研究中得到的结果总结如下1。所开发的去毛刺装置主要由一对弹簧支撑的切削刀片和圆柱凸轮振荡机构组成，该机构能够精确地跟踪交叉孔的交点曲面。实验证明，当交叉孔直径比不小于1.4.3左右时，所提出的去毛刺方法对于去除交叉孔的毛刺是非常有效的。经运行试验，凸轮机构有少量磨损，但磨损对去毛刺功能的影响很小。在大多数情况下，一定程度的轴偏或孔斜并不妨碍去毛刺。除毛刺试验适用于普通碳钢、黄铜、铜和铝合金。在所有情况下，所提出的方法和装置至少在原则上是有效的。

The major aim of the present research project is to propose a new effective de-burring method suitable for inner burrs which are generated in drilling curved surfaces like as intersection of cross holes. Some prototypes of de-burring devices according to the proposed principle are developed and carefully tested. The results obtained from the research are summarized below.1. The developed de-burring devices are mainly composed of a pair of spring supported cutting blades and cylindrical cam oscillating mechanism which affords to trace exactly the curved surface of the intersection of the cross holes.2. The experiments proved the proposed de-burring method is very effective for removing burrs of cross holes, if the ratio of cross hole diameters is not less than about 1.4.3. Small amount of wear of the cam mechanism is observed after the running tests, however, the effect of the wear on de-burring function is very slight. Some amout of offset of axis or inclination of hole are not obstruction for de-burring in most cases.4. The de-burring tests are carried out for plain carbon steels, and also brass, copper and aluminum alloy. All cases the proposed method and devices are effective at least in principle.