Abstract
The article deals with the important problem of increasing the operating life of roll-balance system plunger hydraulic cylinders and describes the solution to this problem. The durability of plunger hydraulic cylinders determines not only the overall reliability of a hydraulic system, but also the technical and economic efficiency of the whole wide-strip hot rolling mill. Hydraulic cylinder durability depends primarily on the wear resistance of sealing units. Therefore in order to provide an effective approach to increasing the hydraulic cylinder life we have developed an analytical method for determining wear resistance of sealing units (i.e. determining a class or category) and calculating their expected operating life. The method is based on the solution of the fundamental equation of energy and mechanical theory of stationary units wear-fatigue as well as the theoretical provisions describing the strain pattern, initial and limiting values pertaining to plunger cylinders sealing units operating conditions. We have performed a computer experiment to study the behavior of various sealing materials and plungers with different antifriction coatings. As the result of the experiment we have established a number of ways to improve wear resistance of sealing units and durability of hydraulic cylinders by utilizing more durable elastomers and application of double-layer metal-polymer coatings. The most reliable design options of sealing units have been pilot tested and put into operation.
Highlights
Practice has shown that the durability of hydraulic roll-balance systems used in wide-strip hot rolling mills is primarily dependent on the useful life of plunger hydraulic cylinders sealing units
Project evaluation technique for determining a wear resistance class/category of a sealing unit and forecasting the useful life of hydraulic cylinders can be presented as a sequence of the following calculations, made in consistence with the provisions of paper [1]
Analytical technique (1) – (5) is used for theoretical assessment and improvement of wear resistance and life of plunger hydraulic cylinders operating in the roll-balance system of wide-strip rolling mills
Summary
Practice has shown that the durability of hydraulic roll-balance systems used in wide-strip hot rolling mills is primarily dependent on the useful life of plunger hydraulic cylinders sealing units. Project evaluation technique for determining a wear resistance class/category of a sealing unit and forecasting the useful life of hydraulic cylinders can be presented as a sequence of the following calculations, made in consistence with the provisions of paper [1]. Analytical technique (1) – (5) is used for theoretical assessment and improvement of wear resistance and life of plunger hydraulic cylinders operating in the roll-balance system of wide-strip rolling mills
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