One-step method hot-bending bend device and process

The invention discloses a one-step method hot-bending bend device and process. The process comprises the steps that firstly, the theoretical length of a formed bend is calculated based on the compensation principle, feeding is carried out through an automatic plasma fire cutting machine or a sawing machine, a mechanical bevelling machine is used for beveling, and a short joint, the raw material of the bend, is manufactured; secondly, the circle center of a fast-mounting fixture and the center of a three-claw locating chuck are adjusted to be on the same line, feeding is carried out, a three-claw locating top is sleeved with one end of a steel pipe raw material in a sliding mode, a bore spine wheel is used for locking, the other end of the steel pipe raw material is placed in the fast-mounting fixture, an auxiliary push-pull oil cylinder is used for clamping, and then a fast-mounting claw bolt is used for locking; thirdly, a medium frequency heating device is used for heating, a hydraulic pulling device is used for pulling, meanwhile, a rocker arm is rotated to the specified angle, and bend heating and bending are completed; fourthly, the bend is offline and put into a storehouse after passing inspection. Key portions of an original process device are innovated, the original process device and procedures are changed, and therefore the aims of improving production efficiency and guaranteeing product quality are achieved.