Fixing device for turnup processing of ultrahigh molecular weight polyethylene pipeline flange

The fixing device comprises a lower die, a supporting frame is fixedly welded to the upper end face of the lower die, a hydraulic machine is fixedly installed at the upper end of the supporting frame, and the lower end of the hydraulic machine is fixedly connected with an upper die. According to the fixing device for flange flanging machining of the ultra-high molecular weight polyethylene pipeline, the hydraulic machine is started to drive the upper die to move downwards and drive the guide rod and the pressing ring to move downwards, the upper die conveniently extrudes a flange to conduct flanging machining, after flanging machining, the upper die ascends again, the spring drives the pressing ring to push the flange downwards, and the flange is fixed. The outer side of the flange fastening clamping sleeve upper die is prevented from being conveniently and automatically detached, the machining efficiency is influenced, the movement range of the pressing ring can be limited through the design of the limiting