The invention relates to a bending
machine controlling torque adjustment and roll bending through a PLC and a method. The bending
machine comprises a driving motor, a clamping-fixing seat and a PLC mainframe, wherein the driving motor, the clamping-fixing seat and the PLC mainframe are arranged on a
machine frame, a bending shaft is installed on the driving motor, and a machined part is arranged on the clamping-fixing seat. The bending machine further comprises a
capacitive sensing thickness
detector installed on the machine frame through a support, a proximity switch installed on the clamping-fixing seat, a
pressure sensor and a rolling shaft, wherein the rolling shaft is connected to the upper end face of an adjusting plate, and the lower end face of the adjusting plate is installed in an installing groove formed in the clamping-fixing seat by means of a rotary shaft and a spring. The bending machine adopts the
pressure sensor to control clamping force, and excessive deformation and looseness of boards are avoided. Bending is performed by utilizing most suitable torque, and
machining quality is improved. The bending machine automatically controls a bending angle through the arranged proximity switch and prevents excessive bending. The inner concave face of the machined part is rolled through the rolling shaft, and cracks and burrs at the position of the concave face are decreased.