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Design of Grinding Machine Spindle

Rudolf L., Fries J., Ucen O., Kubin T., Kudrna L.

Multidisciplinary Aspects of Production Engineering

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2018

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Vol. 1, Iss. 1

69--75

EN

When grinding high demands are usually placed on the geometrical tolerances of the workpiece surface. For this reason, the spindles of the grinding machines are normally designed with requirements for a minimum position change of the grinding disks due to external forces and bending moments. The design theory of these spindles is relatively well elaborated, as it represents the most frequently used solution in practice. However, there are also cases where it is necessary to grind some hard-to-reach areas, using a great ejection of the spindle. In these cases, it is necessary to reassess the required geometrical tolerances with regard to its necessity to comply with the minimal changes in the position of the grinding discs due to the great ejection. Where it is necessary to maintain high geometrical tolerances, it is necessary to ensure a greater rigidity of the spindle. This rigidity is usually improved by increasing its diameter. By doing this we also increase the weight of the spindle that is heavily ejected, and thus its deformation can occur due to gravity forces. That is why it is necessary to analyse the deflection of the spindle depending on its ejection in the course of its design. In the case we increase the diameter of the grinder spindle the possible applicable grinding disc diameter decreases, due to the growing size of its housing. Any grinding of hard-to-reach surfaces is therefore done in particular to improve the quality of the surface with low requirements on the geometrical tolerances. This article deals with the design patterns for a spindle used in axial grinding for inner rotating surfaces. The article contains a spindle design solution and an analysis of its deflections, depending on its ejection, and the size of the passive forces.

2

Calculation and Estimation of Technical Losses in Transmission Networks

Kral V., Rusek S., Rudolf L.

Przegląd Elektrotechniczny

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2012

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R. 88, nr 8

88-91

EN

Technical losses are caused by well-known physical electricity effects and cannot be effectively eliminated. However, they can be measured or calculated according to known line parameters. Distribution companies need the possibility to predict and estimate these losses as they are an important economic indicator, therefore they have fundamental importance. The paper deals with the possibilities of software developed and tested on real databases of measured losses provided by a distribution company.

PL

Straty techniczne spowodowane są przez znane zjawiska fizyczne i nie mogą być skutecznie wyeliminowane. Jednakże, mogą być mierzone lub obliczane według znanych parametrów linii. Spółki dystrybucyjne potrzebują możliwości przewidywania i szacowania tych strat, ponieważ są one ważnym wskaźnikiem ekonomicznym, dlatego mają fundamentalne znaczenie. Artykuł traktuje o możliwościach oprogramowania opracowanego i testowanego na rzeczywistych bazach danych pomiarów strat, dostarczonych przez firmy dystrybucyjne.

3

Software for calculation of technical losses in transmission network

Král V., Rusek S., Rudolf L.

Przegląd Elektrotechniczny

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2011

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R. 87, nr 2

91-93

EN

Technical losses arise by known physical electricity effects and it is not possible to eliminate them effectively. The paper deals with the 1st version of software tool for technical losses of transmission system lines calculation. The inputs are line parameters and measured data databases from control system of the Czech transmission system operator (ČEPS company). Outputs are Joule’s losses, corona losses and leakage losses for each transmission line. The paper also includes description of input databases structure, calculation result files and computing algorithms.

PL

Straty techniczne powstają przez znane efekty fizyczne związane z energią elektryczną i nie ma możliwości aby je skutecznie wyeliminować. W artykule opisano pierwszą wersję oprogramowania do obliczania strat technicznych w liniach systemowych. Wejściami są parametry linii oraz zmierzone dane z bazy danych systemu kontroli czeskiego operatora systemu przesyłowego (spółka CEPS). Wyjściami są straty Joule'a, straty ulotu i straty nieszczelności dla każdej z linii przesyłowych. Dokument zawiera również opis struktury bazy danych wejściowych, pliki wynikowe obliczeń i algorytmów obliczeniowych.