Wyniki wyszukiwania - BazTech

1

Impact of the technological conditions of plane surface machining on a triangular milling cutter on the residual hysteresis of the movement axis of the machine

Stejskal T., Kráľ J., Rudy V., Melko J., Rjabušin A., Pavliková L.

Advances in Science and Technology. Research Journal

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2017

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Vol. 11, no 3

240--245

EN

The paper deals with the possibilities of measuring the residual displacement or hysteresis on the lateral direction of the movement forces caused by the cutting forces of the machining. A special adjustment of laser interferometry assemblies was used for measurement. The measurement results indicate that the positioning accuracy in addition to the cutting forces also influences the position of the displaced moving substances and the temperature. The complex effect of these parameters is greatly dependent on the design of the machine.

2

Effect of eccentricity of load on critical force of thin-walled columns CFRP

Wysmulski P., Kráľ J.

Advances in Science and Technology. Research Journal

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2017

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Vol. 11, no 3

109--113

EN

The subject of study was a thin-walled C-section made of carbon fiber reinforced polymer (CFRP). Column was subjected to eccentric compression in the established direction. In the computer simulation, the boundary conditions were assumed in the form of articulated support of the sections of the column. Particular studies included an analysis of the effects of eccentricity on the critical force value. The research was conducted using two independent research methods: numerical and experimental. Numerical simulations were done using the finite element method using the advanced system Abaqus®. The high sensitivity of the critical force value corresponding to the local buckling of the channel section to the load eccentricity was demonstrated.

3

CNC milling machine precision analysis through numerical modelling

Svetlík J., Demeč P., Kráľ J.

Advances in Science and Technology. Research Journal

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2017

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Vol. 11, no 2

212--219

EN

The motive behind the effort to make virtual prototyping more sophisticated is first of all cost reduction of manufacturing machine design, followed by reduction of lead time for development, prototyping and testing of the pre-manufacturing machine series. This article deals with the analysis of manufacturing precision of a 3-axial, numerically controlled milling machine. The methodology for precision analysis rests on a selected simplified numerical calculation model of a manufacturing machine on which virtual machining has been conducted. The mechanical inaccuracy itself is calculated by computer via the FEM analysis. The results are processed for visualization by the Excel software.

4

Grinding of shaped tools on CNC tool grinder

Kráľ J., Kráľ jr J.

Advances in Science and Technology. Research Journal

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2013

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Vol. 7, nr 17

6--9

EN

Worm gears are special gears consisting of a worm wheel and a worm. Worm gears can be produced in different ways, depending on the size of the transmission, the number of courses, the pitch angle of worm profile, the number of units produced, the purpose of application, etc. As cylindrical worm gears we consider the cylindrical worms with globoid gears, globoid worm with globoid worm gear and globoid worm with cylindrical worm gearing. This paper deals with the evolvent worm whose curve of the tooth side in the front plane is evolvent. The production of worm with an optimal profile for optimal meshing conditions is an increasingly frequent focus of worm gear manufacturers. The problem of designing the tool cutting edge can be divided into several steps. This article deals with the problems of optimum design of a tool shape for the production of worms; and the problems of calculating the coordinates of the transition cutting edge shape, and thus the path of grinding wheel for sharpening the tool cutting edge shape are solved. By grinding tool of grinding machine we can complete the worm shape and also sharpen the cutting edges of tools for production of worm surface. The problems of calculation of the coordinates are solved with regard to the functioning of the KON 250 CNC grinding machine logic.

5

Calculation of the shape of tool cutt ing edge for production of involute worm

Kráľ jr J., Kráľ J.

Advances in Science and Technology. Research Journal

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2013

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Vol. 7, nr 17

1--5

EN

The article deals with theoretical analysis of the production of worm gears and also the calculation of the tool cutting edges for their production. Based on the design parameters of worm and worm wheel, it is possible to calculate the coordinates of the shape of the tool cutting edge. The exact calculation of the coordinates or parameters requires mathematical formulations and applying mathematical relationships we can transform the design of worm screw profile to the profile of tool. Worms of different types can be produced in various ways, e.g. with a lathe and the plane to set a tool is either axial or normal. In this article we consider their production on the lathe and tool setting in the normal plane. Axial profile of worm is a curve which is the intersection of worm surface and the plane passing through its axis, and normal profile is perpendicular in a selected point to worm profile. This normal profile in more accurately way characterizes the shape of the worm profile, therefore, the calculation of the shape of the tool cutting edge is designed with a tool set to the normal plane. Based on the analyses, the new computation equations were obtained, flowchart compiled and, according to a given regulation, the computer aided calculation of the coordinates can be implemented.

6

Grinding tools and grinding wheels for shaping CNC grinding machine

Kráľ J., Spišák E., Kráľ jr J., Józwik J.

Postępy Nauki i Techniki

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2012

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Nr 15

221-227

EN

Production of screws with the optimal profile in terms of mesh properties is still in focus of worm gear manufacturers. The overall problem of tool edge designing is divided in few parts. This post only partly solves the problem of optimal tool shape design to produce the screws. In this paper is solved the problem of the abrasive wheel forming to produce screws with the logic operation of management system of tool grinder and calculation of profile curve on tooth heel.

PL

Produkcja ślimaków o optymalnym profilu pod względem właściwości siatki pozostaje wciąż w centrum uwagi producentów przekładni ślimakowych. Ogólny problem projektowania ostrzy narzędzi jest podzielony na kilka części. Artykuł ten tylko częściowo rozwiązuje problem optymalnego projektowania kształtu narzędzi do produkcji ślimaków przekładni ślimakowej. W pracy rozwiązano problemu formowania tarczy ściernej do produkcji ślimaka i obliczenie krzywej profilu na stopie zęba.