Tap processing method for acm panel

A tap processing method for an aluminum composite material (ACM) panel, which forms a screw thread in the ACM panel including a metallic inner skin, a metallic outer skin, and a resin core layer interposed between both skins, the tap processing method comprising:

• an inner burring operation of burring the inner skin of the ACM panel so that an inner burr formed in the inner skin extends toward the outer skin while compressing the core layer;
• an outer burring operation of burring the outer skin of the ACM panel so that the outer burr formed in the outer skin extends toward the inner skin while compressing the core layer and the inner burr and the outer burr are also continuously connected to each other;
• and
• a tapping operation of forming a continuous screw thread in the inner burr and the outer burr continuously connected to each other.