Automatic variable diameter chipless cutting machine

The invention relates to the related technical field of pipe cutting equipment, in particular to an automatic variable diameter chipless cutting machine, which comprises a frame, and a supporting mechanism, a clamping mechanism and a rotating mechanism arranged on the frame in turn, wherein the clamping mechanism comprises a clamping bottom plate with a clamping through hole, and a clamping cylinder, a front turning arm and a plurality of clamping force arms, which are arranged on the clamping bottom plate; and the front end of each clamping force arm is provided with a clamping block, and the rear end of each clamping force arm is provided with a clamping rotating shaft, a force applying shaft and a stressed shaft. In spite of the change of specifications of pipes, the clamping device can adapt to a pipe clamping range; and clamp blocks are not required to be changed, and a clamping cylinder mounting position design ensures that force generated by the cylinder is exerted maximally in a linked multi-point clamping mechanism, so that pipes with the maximum diameter are clamped. The machine has high full automation degree, compact and concise structure, safe and reliable electric control and ideal human-computer interface, and is easy and convenient to operate; and the online automation of the cutting machine is realized by a programmable logic controller (PLC).