A method of manufacturing a cylinder barrel for a hydraulic cylinder

Abstract

The invention discloses a method for manufacturing a cylinder barrel for a hydraulic cylinder, which uses a hot-rolled coil as a raw material and undergoes the following steps in order to obtain it: (1) cutting the coil into strip steel; (2) cutting the coil into strip steel; ERW welding to form welded pipes; (3) Quenching and tempering heat treatment for welded pipes; (4) Cold reduction for welded pipes; (5) Precision straightening for welded pipes; (6) Non-destructive testing for welded pipes; Cut to length; (8) Finish the inner and outer surfaces of the welded pipe. This method makes full use of the high precision of the outer diameter and wall thickness of the ERW welded pipe, the high strength and high toughness of the quenched and tempered heat-treated material, the high precision of the cold reduction diameter, the high surface finish and high efficiency, and the precision straightening to improve the straightness and roundness of the steel pipe without damage. The detection improves the reliability of the cylinder. When used as a multi-stage cylinder, the machining allowance of the outer circle is small and the efficiency is high. The high concentricity of the welded pipe and the machining allowance of the scraping and rolling of the inner hole are small, high-precision and high-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