Michał Styp-Rekowski

Tribological problems in shaft hoist ropes wear process

Purpose – The purpose of this paper was to create conditions for the correct decision concerning an exchange of the used rope for a new one. A cognitive goal was to indicate the causes of its wear and determining its mechanism reliability and durability. Design/methodology/approach – The magnetic, organoleptic and strength standard tests of lifting triangle-strand ropes of a mining hoist were carried out. This way the current state of the tested rope was defined. Findings – On the basis of an analysis of the results of the performed tests: magnetic, organoleptic and fatigue tests, it can be said that the magnetic one is accurate enough only to indicate the place of the rope’s biggest weakening, though the degree of weakening is not defined precisely – with significant excess. The accurate rope’s destruction degree is indicated by the strength tests. Practical implications – The results of described investigations can improve safety of the mining rope mechanisms operation, even for an increased resource. O...

Antiwear additives as retarding agents of elements with ceramic coatings wear

Purpose – The purpose of this paper is to determine the appropriate conditions for the chemical deposition of Ni‐P‐Al2O3 composite coatings, deposited on metalic matrix.Design/methodology/approach – Auto catalytic reduction of Ni in nickel sulfate and sodium hypophosphate bath, including 10 percent volume fractions of nanodispersive Al2O3 particles is treated in the alloy steel 100Cr6. The wear resistance and friction coefficient of the coatings are determined using tester T‐01M, a ball‐disc tester for mitigated solid friction conditions, in model lubricants: oil bases, oil bases with antiwear additives AW.Findings – The analysis of the properties of the Ni‐P‐Al2O3 deposits confirms that the presence of the dispersion phase of aluminium oxide determines the coating wearability.Practical implications – The paper presents some indications of proper selection of antiwear coating generation methods (their parameters and conditions).Originality/value – Investigations show that tribocatalytic effect of nickel c...

Machining process automation of large-size elements

Production process is a series of activities aimed at creating a final product for specific tasks. Its structure is first and foremost a technological process, whereby components of the product are given specific shapes and features that allow them to perform these tasks effectively. Analyzes of the possibilities and effectiveness of manufacturing activities automation were performed on the example of machine tools used for machining large parts (EWg). Such machines are increasing, as the demand for these types of devices is increasing [1, 7]. Because of their intended purpose, such machines are also characterized by large dimensions, which imply certain characteristics and limitations in the automation of their manufacturing process. An important issue is that machine tools are increasingly modular. The aim of this paper is to identify factors determining the process of manufacturing the large-size machine tools, especially in the scope of its automation. The results obtained can be useful both for the constructors and manufacturers of not only this group of technological machines.