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

100%

Grdulska A.

2014

tom Vol. 14, nr 3(41)

18--23

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.

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

86%

Liberski P. , Marcinkowski M.

tom nr 10

402-408

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.

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.

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

72%

Kalchenko V. , Yeroshenko A. , Boyko S. , Kalchenko O.

tom Vol. 15, no. 1

9--15

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.