Method for accurate numerically-controlled drilling on large-curvature arc surface

一种在大曲率弧面上精确数控钻孔的方法

Abstract

The invention relates to a method for accurate numerically-controlled drilling on a large-curvature arc surface, and belongs to the technical field of numerically-controlled machining. The method comprises the following steps: selecting a numerically-controlled machine tool meeting machining requirements; clamping; installing a centre drill; running a numerical control program; manually controlling a feed depth h and a feed speed f, and drilling into a part with a depth of 2-3mm away from a contact point of the curved surface at a constant speed; reinstalling a drill bit for machining a primary hole according to a diameter ratio of 80% and the final dimensions of a hole diameter; setting a fixed feed step length L, and setting a circulating lifting height H and a lifting surface; running the numerical control program, and manually controlling the feed speed f to ensure that the hole positions of a setting point of the drill bit and a contact point of the centre drill are the same; drilling the primary hole; reinstalling a drill bit for makeup machining; running the numerical control program, and drilling a final hole in a makeup manner. With the adoption of the method disclosed by the invention, the conditions of drill bit setting point play, part scratches, drill bit in-hole breakage, drilling direction deflection and the like occurring in the drilling process can be effectively avoided, the machining efficiency is high, and the accuracy meets standard requirements.
本发明涉及一种在大曲率弧面上精确数控钻孔的方法,属于数控加工技术领域。包括如下步骤:选择满足加工要求的数控机床;装夹;安装中心钻;运行数控程序;手动控制进刀深度h、进给速度f,匀速钻入距曲面接触点2~3mm深度处即可;根据孔径最终尺寸,按照80%直径比率换装加工初孔用钻头;设置固定进刀步长L,设置循环抬刀高度H和抬刀面;运行数控程序,手动控制进给速度f,保证钻头落刀点与中心钻触点孔位一致;钻制初孔;换装补加工钻头;运行数控程序,补钻终孔。本发明采用上述方法,可有效避免钻制过程中出现钻头落点窜动、划伤零件、钻头于孔内断裂、钻制方向偏移等情形,加工效率高,精度符合标准要求。

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