Online punching device for automobile frame arc welding line

The invention provides an online punching device for an automobile frame arc welding line, and relates to the technical field of automobile welding processes. The online punching device comprises a base and an automobile frame supporting mechanism arranged on the base; an online punching mechanism is arranged on the base, and an online reshaping mechanism is arranged at the arc welding position ofan automobile frame; the online punching mechanism comprises a bottom plate arranged on the base and a die seat arranged on the bottom plate and matched with a sheet metal part of the automobile frame; a punching cavity is formed in the die seat, and a puncher pin is slidably arranged on the bottom plate in the axial direction of the punching cavity; and a driving mechanism for driving the puncher pin to slide is further arranged on the bottom plate. By using the online punching device, the sheet metal part is punched online, the hole position precision can reach a designed value, and thus the influence of deformatio