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2 2010

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Thermal drilling as a progressive technology of creating of bushings

Sobotova L., Spisak E.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

2010

z. 81 [277]

73-78

The contribution deals with joining of materials and creating of bushings from aluminium materials, with using of new joining technology by thermal drilling, it means by Flowdrill method. This method is using at joining of materials such as sheets, pipes, hollow profile, where the thickness of material does not allow to make the drilling with enough number of threads. Also we can compare this thermal drilling technology with production of smooth cylindrical and conical bushings by forming technologies as hole burnishing. This paper was made with cooperation with firm Commerc Service spol.s.r.o., Presov.

Evaluation of some mechanical properties of steel sheet

Sobotova L., Dulebova L.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

2010

z. 81 [277]

79-84

The requirement for reducing of weight of products urges the producers to reducing thickness of used materials. It means the reducing of thickness of products from sheet. The second requirement for product is its adequate stiffness. These requirements force product manufacturers from sheet material to ask for development of sheets with higher strength properties and formability from sheet producers. The properties of sheet must guarantee deep- drawing of stampings without problems, but with required qualitative and dimensional parameters. The contribution solves the problem of deep drawing of bath tubes and pressability of steel sheets used at the production of bath tubes. The thickness of used steel sheets were changed from 1,55 mm to presented 1,35 mm. This change had an influence on the required properties of steel sheets and also the changes of technological conditions of deep drawing. The next surface finishing of pressing - bath tube requires the roughness of surface in the defined boundary.