High-temperature-resistant hydraulic cylinder manufacturing technology

Abstract

A high-temperature-resistant hydraulic cylinder manufacturing technology comprises the following steps of (1) material selection, (2) product machining and (3) technology design. A material of a hydraulic cylinder is selected according to the pressure of a working medium and the size of a working cylinder. 40 forged steel or 45 forged steel or carbon steel STKM13C can be selected as the material of the hydraulic cylinder and a piston rod can be made of S45C carbon steel. Seamless cold drawing is conducted on the surface of the hydraulic cylinder, high-accuracy inclination intersecting boring is conducted on the inner diameter portion, the tolerance of the inner diameter ranges from H7 to H9, the surface roughness ranges from 0.8 S to 2.0 S, and the tension strength is over 5.2 MPa. Grinding and hard chroming are conducted on the outer diameter portion of the piston rod, the tolerance of the appearance ranges from f7 to f8, the surface hardness is over HV700, the surface roughness ranges from 0.8 S to 1.6 S, and the chroming thickness is 20 micrometers. According to the high-temperature hydraulic cylinder manufacturing technology, the hydraulic cylinder is good in high-temperature-resistant performance, the service life of a sealing device of the hydraulic cylinder can be prolonged, the number of needed spare parts is small, the number of replacement periods can be reduced, and therefore the labor intensity of workers is relieved; the structure is simple and the hydraulic cylinder is safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of mechanical hydraulic equipment manufacturing, and in particular relates to a manufacturing process of a high-temperature-resistant hydraulic cylinder used in the metallurgical industry, in particular to a manufacturing process of a high-temperature-resistant hydraulic cylinder. Background technique [0002] With the wide application of hydraulic technology, the performance requirements of hydraulic components are getting higher and higher. For the actuator-hydraulic cylinder, the main factors affecting its service life are the buffering effect and sealing effect. There are many defects in the traditional design, which cannot meet the continuous requirements for sexual production. Zhejiang Aosi Hydraulic Pneumatic Equipment Co., Ltd. and Tianjin Uranus Hydraulic Machinery Co., Ltd. have proposed a new type of cylinder buffer design-ladder buffer for the defects in the current domestic hydraulic cylinder st...

AI Technical Summary

Problems solved by technology

Traditional ultra-high temperature hydraulic cylinders generally adopt the method of adding water jacket or using silicone rubber seal to realize the high temperature resistant working characteristics of the product, but the method of adding water jacket is generally not easy to meet the requirements of quick replacement in production and application. At the same time, the structure is complicated, and sometimes it is not easy to realize on-site Size requirements, so there are certain limiting factors in practical application (the reason is that the temperature of molten steel is above 1300°C, if the water splashes into the molten steel, the water will instantly gasify and expand and explode, which is very dangerous); it is sealed with silicone rubber, and the actual resistance The high temperature performance is only around 240°C, which cannot fully meet the actual needs

At present, most of the tundish quick-change mechanisms in iron and steel plants in the metallurgical industry mostly use traditional ultra-high temperature hydraulic cylinders, and some use traditional ultra-high temperature hydraulic cylinders to add a steel plate that blocks heat radiation or directly wrap heat-resistant belts on the surface of high-temperature hydraulic cylinders, but this is also It cannot fully meet the actual needs, and due to poor high temperature resistance, a large number of spare parts are required, and frequent replacement affects production

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