Cylinder barrel of oil cylinder of crane and processing process thereof

The invention discloses a cylinder barrel of an oil cylinder of a crane and a processing process thereof. The invention belongs to the field of hydraulic cylinders. The material of a cylinder barrel body is Q345B. The material contains alloy elements, such as Cr, Nb, Ni, V and the like, and the mechanical property and the welding property are both better than those of 45# steel. The processing process comprises the following steps: (1) using a hot rolling steel pipe: selecting on a pipe blank, blanking, aligning, rough turning on an outer circle, welding on a flange, scraping on an inner hole, rough turning and finish turning; and (2) using a high-accuracy cold drawing steel pipe: cold drawing, aligning, blanking, welding on a flange, scraping on an inner hole, rough turning and finish turning; and the cylinder barrel of the oil cylinder of the crane and the processing process thereof are characterized by the technological parameter of welding, the technological parameter of cold-drawing processing and the technological parameter of scraping processing. The cylinder barrel of the oil cylinder of the crane and the processing process thereof have the beneficial effects that the welding defect of the oil cylinder is lowered by more than 50 percent; and moreover, the after-fracture elongation rate of the material of the cylinder barrel is enhanced, the toughness of the cylinder barrel is ensured, and the danger of the occurrence of brittle fracture of the cylinder barrel is decreased, so that the safety reliability of the oil cylinder is greatly enhanced.