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1

Modelling of contact geometry of tool and workpiece in grinding process with crossed axes of the tool and workpiece with circular profile

Kalchenko Volodimyr, Yeroshenko Andrij, Boyko Sergiy, Kalchenko Olga

Acta Mechanica et Automatica

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2021

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Vol. 15, no. 1

9--15

EN

A general model is developed, and on its basis, there are special models formulated of the grinding process with crossed axes of the tool and workpiece with a profile in the form of a circle arc. A new method of control of the grinding process is proposed, which will provide processing by equidistant curves, and the amount of cutting of a circle equal to the allowance. This will increase the productivity and quality of grinding. The presented method of grinding implements the processing with the spatial contact line of the tool and workpiece. When the axes are crossed, the contact line is stretched, which leads to an increase of the contact area and, accordingly, to a decrease of the temperature in the processing area. This allows processing of workpieces with more productive cutting conditions.

2

Crossing axes of workpiece and tool at grinding of the circular trough with variable profile

Kalchenko V., Yeroshenko A., Boyko S.

Acta Mechanica et Automatica

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2018

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Vol. 12, no. 4

281--285

EN

In the article the method of grinding with crossed axes of the tool and the workpiece got further developed. The work discloses a method of processing details having an external surface with a profile in the form of an arc of a circle of variable radius (for example, rolls of pipe rolling mills). The particular three-dimensional geometric models of the processing, shaping and profiling of abrasive wheels have been developed. A method for controlling the grinding process, which ensures the removal of allowances along equidistant curves has been offered. The developed method of grinding provides a constant depth of cutting according to the coordinate of profile processing. This is achieved at the expense of the synchronous inclination of the wheel and its insertion by the size of the allowance. The diameter of grinding wheel affects on the maximum angle of orientation of the wheel has been proven. It has been shown that increasing the diameter of the abrasive wheel has led to a slight decrease in value orientation angle.

3

Measurement of force components and Ra surface roughness parameter during grinding titanium alloy

Grdulska A.

Advances in Materials Science

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2014

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Vol. 14, nr 3(41)

18--23

EN

The paper deals with the measurements of selected parameters during grinding process of aerospace industry alloy. Grinding is one of the most important methods of shaping machine elements. As a result of grinding with high dimensional and shape accuracy as well as with the expected parameters describing the state of the surface layer (SL) should be obtained.Grinding difficult to machine materials used in the aerospace industry is an issue currently being examined by various research centres. An excellent example is the analysis of the grinding process of titanium alloys, as these materials have very poor machinability due to the tendency to adherence to abrasive materials, low thermal conductivity, high strength and compliance at elevated temperatures, which may adversely impact on the quality of SL. A number of factors influence on shaping SL. Worth mentioning are mechanical and thermal phenomena, as well as the type of cutting fluid and abrasive materials.

4

Kierunki rozwoju szlifowania

Gołąbczak A.

Mechanik

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2011

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R. 84, nr 12

XXII-XXIII

PL

Główne kierunki rozwoju szlifowania ściernicowego dotyczące materiałów i narzędzi ściernych, obciągania ściernic, innowacyjnych metod szlifowania oraz konstrukcji szlifierek.

5

Badania zużycie ściernego materiałów trudnościeralnych stosowanych w wibracyjnej wirówce odwadniającej

Zaborski S., Lewandowski W., Sudzik A.

Zeszyty Naukowe Politechniki Świętokrzyskiej. Nauki Techniczne

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2008

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Z. 11

337--344

PL

W artykule zamieszczono wyniki badań zużycia ściernego materiałów trudnościeralnych. Materiały te stosowane będą w wibracyjnej wirówce odwadniającej. Badania polegały na pomiarze zużycia ściernego i były prowadzone na stanowisku do szlifowania luźnym ścierniwem (miał węglowy), dla różnych wartości siły docisku przy różnych prędkościach tarczy metalowej w czasie t = 3 min. Pomiary zużycia materiałów trudnościeralnych przeprowadzono według programu statystycznego zdeterminowanego PS/DS. – P:α. Z programu PS/DS. – P:α otrzymano równania funkcji regresji zużycia w funkcji prędkości tarczy metalowej i siły docisku, które zobrazowane zostały na wykresach przestrzennych.

EN

In article were put the results of analysis of abrasive wear of the abrasive wear resistance materials. These materials will be applied in vibratory draining centrifuge. The analysis depended on measurements of abrasive wear and was led on station to loose abrasive material polishing (coal dust), for three value of pressure strength near three speeds of metal shield in the time equal t = 3 min. Measurements of abrasive wear of the abrasive wear resistance materials conducted according determined statistical program PS/DS - P:α. From PS/DS - P:α program received equation of regress function of abrasive wear in function of speed of metal shield and pressure strength which were pictured on 3D plots.

6

Zastosowanie obróbki strumieniowo ściernej w technice cynkowania zanurzeniowego oraz przed malowaniem powierzchni ocynkowanych

Liberski P., Marcinkowski M.

Ochrona przed Korozją

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2007

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nr 10

402-408

PL

W artykule przedstawiono zalety stosowania obróbki strumieniowo ściernej w procesie przygotowania powierzchni wyrobów przeznaczonych do cynkowania zanurzeniowego. Przedstawiono ścierniwa stosowane w obróbce powierzchniowej oraz szczególnie przydatną w technologii metalizacji zanurzeniowej metodę oczyszczania bezpyłowego. W dalszej części pracy określono zastosowanie technologii "omiatania" powierzchni powłok cynkowych przed ich malowaniem. Przedstawiono zalety metody "Duplex" oraz zalety i przydatność obróbki strumieniowo ściernej w procesie malowania powłok cynkowych.

EN

The merits of abrasive blasting in the surface preparation of products prior to hotdip galvanizing have been presented in the article. Abrasive materials used in surface processing and a dust-free cleaning method which is especially useful in hot-dip metallizing have been shown. The application of the technology of 'sweeping' zinc coating surfaces before painting has been discussed. Merits of the 'Duplex' method and the usefulness of pneumatic- abrasive surface blasting in the process of painting zinc coatings have also been presented.

7

Occupational Exposure to Harmful Chemical Substances While Processing Phenol-Formaldehyde Resins

Pośniak M., Kozieł E., Jeżewska A.

International Journal of Occupational Safety and Ergonomics

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2001

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Vol. 7, No. 3

263--276

EN

Air pollutants emitted while processing phenol-formaldehyde resins have been investigated. Gas chromatography-mass-selective detection was used to separate and identify chemical compounds. It was determined that workers were exposed to formaldehyde in all workplaces. Besides, phenol, acetaldehyde, acrylaldehyde, 2-furaldehyde, xylene, ethylbenzene, toluene, tetrachlorethene, ethyl acetate, butyl acetate were found during the production of frictional materials; and 2-furaldehyde, phenol, naphthalene, 2- furanmethanol, polycyclic aromatic hydrocarbons (PAHs) during the production of abrasive materials. Quantitative analyses were performed with gas chromatography and high performance liquid chromatography. Assessment of occupational exposure indicated that chemical compounds emitted during the investigated processes might be dangerous for human health, mainly because of suspected carcinogenic compounds: formaldehyde and PAHs.