Is it better to punch copper workpieces or drill bits?

The main problems of drilling red copper are: 1, the pass is not round and polygonal, and the drilling entrance is enlarged; 2. Not only that, the hole wall has tear marks, and sometimes there are spiral extrusion marks, and the burr at the hole is large, so the drill bit is easy to bite into the hole; 3. The soft copper sheet is continuously wound on the drill bit, which is unsafe and the drilling efficiency is low. Based on the above conditions, it is best to choose the machining method of workpiece turning instead of drill. This can prevent copper chips from winding on the drill bit and ensure the roundness of the hole. In the process of machining, it is necessary to rotate quickly and slowly to promote chip breaking and prevent the bit from being stuck.