Slavko Pavlenko

A DEVICE DESIGNED TO MONITOR NEW BELT TYPES WITH APPLICATION OF DIAGNOSTIC SYSTEM

The presented paper deals with the alternative of determination of state of new belt types of the belt gear in case of a designed device. The developing and structural-design stage, during which realization of a testing device was performed with Autodesk Inventor program, was followed by a production technology design. An electric motor serves as a device drive and belt gear with the other electric motor representing a system load factor. The frequency converters diagnosed by the software intended for the purpose drive both motors. Through a simple adjustment of the designed device, diverse types and dimensions of the belts and belt pulleys can be changed. Monitoring and diagnostics of the tracked parameters was performed by the sensors fixed in the positions prescribed in advance. All the parameters can be assessed by a PC.

Abrasive Granularity Impact on Water Jet Technology Head Vibrations during Cutting Steel

The submitted paper deals with analyses of impact of water jet technology head vibrations due to variations of kinds and granularity of abrasive during steel cutting manufacturing process using AWJ technology. The paper points at necessity to diagnose and subsequently eliminate possible sources of adversed vibrations. They can influence lifetime and wear of water jet technology head, they can lower reliability as well as cutting edge quality.

Experimental Investigation and Determination of Abrasive Granularity Change Impact to Technology Head Vibration Generating during AWJ Technology Steel Cutting

The paper describes abrasive kind and granularity change impact to technology head vibration generating during cutting of seven selected investigated kinds of steel by means of AWJ technology. The investigation of abrasive granularity impact is carried out for three speeds of the technology head shift. A set of 3D comparative graphs of vibration parameter relations for seven analyzed kinds of steel from graphical records of vibration acceleration amplitude to frequency relation was created. On the base of the comparative graphs a discussion about results is generated and conclusions are defined. The work presents a thematically integrated part of a dissertation results and completes a group of recent knowledge focused on production systems working state diagnostics with the water jet technology.

Component Selected Parametres Geometrical Tolerance Value Experimental Specification

The submitted paper deals with an analysis of geometric deviations, reasons of their generation and provides their brief description. It points at ways and abilities of measuring shape deviations by means of contact and contactless measuring methods and deals with errors which can affect results of measuring. The papers also says about practical measuring geometrical deviations by commonly used tools. It evaluates and analyses ability of measuring by various devices. It shows a review of individual measured values and thus provides a view of efficiency, simplicity and accuracy of individual measuring methods and measuring devices.

DESIGN OF A PROGRAM FOR CALCULATION OF FORCING SPRING STIFFNESS

The presented paper deals with a design and generation of a program for calculation of stiffness and shear stress of forcing springs. The given calculation program was generated in the program of Microsoft Office through the Excel application by means of defined sequences of the individual orders. The calculation program serves for calculation of stiffness of cylindrical and conic helical forcing springs with circular and rectangular section of wire. The designed program calculates shear stress and stiffness of the spring after entering parameter values inevitable for calculation. The program contains also a database of the standardized springs which after selection of the standardized spring assures inserting of corresponding values by means of which the program prevents a user from incorrect defining of the standardized data.

DESIGN AND CHECK OF THE MECHANICAL COMPONENTS BY THE PC APPLICATION

The paper focuses especially on comparison of available programs for design and check of the mechanical components. The main aim of the paper is to analyse in the introductory part the individual programs from the perspective of content and functionality and consequently to compare the results experimentally in selected cases. The paper evaluates simplicity or complexity of work with the individual software types on the basis of input requirements [Bicejova 2016a]. The conclusion summarizes the issue and experience acquired in designing and in checking of the mechanical components.

INFLUENCE OF SELECTED TECHNOLOGICAL PARAMETERS ON CUTTING SURFACE ROUGHNESS IN MATERIAL LASER CUTTING

The paper deals with the influence of the selected technological parameters on cutting surface roughness in material laser cutting. It more closely examines and compares technological parameters such as cutting speed, laser performance, and gas pressure. The paper also contains the information on influence of the respective technological parameters on character of the material surface cut by laser S235JRG2 (according to EN 10025/90+A1/93) with change of the selected material thickness. The conclusion presents a discussion analysing the experimental measurements and their application in practice.

DETERMINITATION OF RELATION BETWEEN INFLUENCE OF LASER PERFOMANCE CHANGE AND CUTTING SURFACE CHARACTER IN LASER CUTTING TECHNOLOGY

The introduction of the submitted paper describes theoretical foundations of material laser cutting technology. The core analyses direct relation between influence of laser performance and cutting surface character when the cutting material thickness changes. The experimental measurements applied material S235JRG2 (according to EN 10025/90+A1/93) with thickness of 3 mm, 4 mm, 6 mm, 8 mm and 10 mm. The conclusion presents recommendations for entrepreneurial, research, and pedagogical sphere.

Measuring, Processing and Evaluating of Technology Head Water Jet Vibration Signal

The submitted paper presents a technical system for vibration measuring, processing and evaluating The technical system is presented as a part of a survey which main goal was to find out an influence of working conditions on creation and extend of vibration within production systems. The work introduces a demonstrational example of measured, processed and evaluated data of an experiment where parametres of vibrations, which were created due to water jet technological head parametres changes, were scanned.

Determination of Optimal Combination of Technological Parametres during AWJ Technology Material Cutting by Means of Created Database Programme

The paper presents a database programme which was created on the base of the search focused on working condition impact to generating and extend of vibrations at AWJ technology production systems. The database programme serves for less complicated, but mainly quicker and more effective searching of an optimal combination of technological parametres to get minimal values of vibration parametres during AWJ technology selected materials cutting. The work presents a thematically integrated part of a dissertation.