Method for manufacturing cylinder barrel for hydraulic cylinder

Abstract

The invention discloses a method for manufacturing a cylinder barrel for a hydraulic cylinder. According to the method, a hot rolled coil plate serves as a raw material, and the method comprises the following steps that (1) a coiled plate is cut into strip steel; (2) the strip steel forms a welded pipe by ERW welding; (3) tempering heat treatment is carried out on the welded pipe; (4) cold reduction is performed on the welded pipe; (5) precise straightening is performed on the welded pipe; (6) nondestructive detection is performed on the welded pipe; (7) the fixed ruler of the welded pipe is cut off; and (8) finish machining is performed on the inner surface and the outer surface of the welded pipe. According to the method, the outer diameter and the wall thickness of the ERW welding pipeare fully utilized, the material with high precision and tempering heat treatment is high in strength and toughness, the high-precision and high-precision high-surface finish is achieved, the efficiency is high, the straightness and the roundness of the steel pipe are improved precisely, the straightness and the roundness of the steel pipe are improved, the reliability of the cylinder barrel is improved without damage detection, the outer circle machining allowance is small when the multi-stage cylinder is used, the efficiency is high, and the high concentricity of the welded pipe and the machining allowance of scraping and rolling of an inner hole are small and high in precision and efficiency.

Description

technical field [0001] The invention provides a method for producing cylinder barrels for hydraulic oil cylinders by using the production technology of quenching, tempering, cold reducing and finishing of ERW welded pipes. It belongs to the field of ultra-deep processing of steel and manufacturing of mechanical parts. It is suitable for high-efficiency mass production of high-precision, high-strength, high-toughness cylinder barrels for hydraulic cylinders. In particular, the cylinder barrel for multi-stage hydraulic cylinders has high production efficiency, high metal yield and low production cost. Background technique [0002] At present, seamless steel pipes are generally used as raw materials in the production of cylinder barrels for hydraulic cylinders. The conventional production process is the direct processing of seamless steel pipes cut to length and repeated external and internal boring for multiple passes. The metal yield is only 50%. ~55%, and poor mechanical p...

AI Technical Summary

Problems solved by technology

[0002] At present, seamless steel pipes are generally used as raw materials in the production of cylinder barrels for hydraulic cylinders. The conventional production process is the direct processing of seamless steel pipes cut to length and repeated external and internal boring for multiple passes. The metal yield is only 50%. ~55%, and poor mechanical properties, low dimensional accuracy

The more advanced production process is the inner hole honing process of seamless steel pipe pickling, cold drawing and annealing. Although the strength and precision are improved, the waste of metal materials is serious in the process of producing cylinder barrels, and the highest metal yield is generally 70-75%. %, and in the production process, a large amount of waste acid and waste water will be produced, and the cost of environmental protection is high, which makes the cost of cylinder barrel production relatively high

The relatively advanced production process in foreign countries is the inner hole scraping and rolling process of welded pipe normalizing pickling, cold drawing and annealing. The metal recovery rate is 80-85%. However, in the production process, a large amount of waste acid and waste water will be produced, and the environmental protection cost is relatively high. , although the mechanical properties of the finished cylinder are better and the dimensional accuracy is higher, the cost of making the cylinder is higher