If the rivet head does not fall off after drilling, what tool is used to remove it?

When a rivet head remains intact after drilling, a punch is the appropriate tool to remove it. This is because a punch is specifically designed to apply force to the center of the remaining rivet shank, driving it out of the hole without damaging the surrounding material. The direct impact of the punch allows for precise application of force, ensuring that the rivet can be effectively removed without compromising the integrity of the workpiece.

Using other tools like pliers could result in a lack of control and potentially damage the area around the rivet, while a hammer would not provide the same focused force on the rivet shank as a punch. Similarly, a chisel is typically used for cutting or shaping materials rather than for removing fasteners efficiently, making it unsuitable for this particular task. Thus, a punch is the most effective and appropriate choice for driving out the remaining rivet shank cleanly and effectively.