PVC Door-Window 4-corner welding machine with CNCis special equipment for processing PVC door and window; automatic achieving to welding rectangular PVC frame and fan. It is a new type we developed and has lead high level in China. Use CNC control system, imported MITSUBISHI servo motor and PC; super touch screen control system, it easy to operate. Adopt different kind of profiles to achieve high accuracy automatic scale clamping angle; Adopt original installation import flat square guide rail, which can guarantee the precision of the heads when moves horizontally. Transmission adopts the original imported installation ball bearing master screw. The precision is extremely high so it can guarantee group angle quality. The servo controlling machines, servo motor, person-machine touching the contact surface are adopt the original imported installation of Japanese Mitsubishi system, and the increase assistance brake system. It is stable and efficiency. Adapt to three sides covering course, and have the function of crimping and positioning. Effectively ensure the dimensional accuracy of welding products, such as the shape and location accuracy and flatness. Welding tumor double overflow through the rational control, effectively increasing profile welding area and increasing 30% welding intension; meanwhile, to achieve the desired effect of cleaning up the angle joints prepared the necessary conditions. Achieve to welding a frame one time will greatly enhance the work efficiency.