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3 2018

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Tubes bending by tool from abrasion resistance cast iron

Brusilova A., Schrek A., Svec P., Gabrisova Z., Pokusova M.

Hutnik, Wiadomości Hutnicze

2018

Vol. 85, nr 8

260--263

By reason of efficiency improving of power generating equipment (heat exchanger), it has been required arrangement change the structure of the exchanger body tubes. This required minimizing the bending radius of the exchanger tubes. For required parameters achievement of tubes bending, it was necessary to optimize process parameters and functional parts of bending machine forming tool. For one main part of forming tool bending rail, it was used a new-developed type of cast iron with especially suitable characteristics minimizing a coefficient friction during forming processes. The obtained results and material properties progress in strain area of exchanger tubes are presented in this paper.

Ze względu na poprawę wydajności urządzeń wytwarzających energię (wymiennika ciepła) wymagana była zmiana konstrukcji układu korpusów rurowych wymiennika. Wymagało to minimalizacji promienia gięcia rur wymiennika. Aby uzyskać wymagane parametry gięcia rur, konieczne było zoptymalizowanie parametrów procesowych i funkcjonalnych części narzędzia formującego giętarki. Dla jednej z jej głównych części - szyny prowadnicy do gięcia, zastosowano nowego typu żeliwo o szczególnych właściwościach, minimalizujących współczynnik tarcia podczas procesów formowania. W artykule przedstawiono wyniki gięcia rur wymiennika przy zastosowaniu narzędzi z materiałów o nowych właściwościach.

Influence of veneer perforation on 2D formability of two-layer material

Fekiač J., Gáborík J.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2018

No. 104

53--59

The aim of the paper is to investigate the effect of different perforations in veneers on the 2D formability of two-layer material. Veneer perforation was done with a CO2 laser. The two-layer material was composed of two veneers, one perforated and one entire (non-perforated), the fibers in the veneers being perpendicular to one another, and was glued using a polyethylene film. The 2D (planar) formability of two-layer materials was detected by three-point bending load and evaluated through the minimum bending radius. The most significant improvement of formability wasobserved after perforation in the shape of the letter "I" at the perforation direction parallel to the wood grain.

Influence of veneer perforation on 2D formability of two-layer material

Fekiač J., Gáborík J.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2018

No. 104

267--273

The aim of the paper is to investigate the effect of different perforations in veneers on the 2D formability of two-layer material. Veneer perforation was done with a CO2 laser. The two-layer material was composed of two veneers, one perforated and one entire (non-perforated), the fibers in the veneers being perpendicular to one another, and was glued using a polyethylene film. The 2D (planar) formability of two-layer materials was detected by three-point bending load and evaluated through the minimum bending radius. The most significant improvement of formability was observed after perforation in the shape of the letter "I" at the perforation direction parallel to the wood grain.