Wyniki wyszukiwania - BazTech

1

Wpływ nagniatania ślizgowego kompozytem diamentowym na topografię powierzchni utwardzonych stali narzędziowych do obróbki plastycznej na zimno

Toboła D., Łętocha A.

Mechanik

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2018

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R. 91, nr 12

1110--1115

PL

Przedstawiono wyniki analizy topografii powierzchni wybranych stali narzędziowych, przeznaczonych do obróbki plastycznej na zimno, po sekwencyjnym procesie toczenia na twardo i nagniatania ślizgowego końcówką z kompozytu diamentowego z 10-proc. dodatkiem TiB2. Obróbkę cieplną badanych gatunków stali przeprowadzono w piecu próżniowym. Uzyskano odpowiednio twardość: 55 ± 1 HRC (Sverker 21), 59 ± 1 HRC (Vanadis 6), 64 ± 1 HRC (Vanadis 8), 67 ± 1 HRC (Vanadis 60) oraz 62 ± 1 HRC (Vancron 40). Ukształtowane powierzchnie analizowano pod kątem stereometrycznych cech charakteryzujących warstwę wierzchnią (WW). Wyniki dowodzą, że zastosowanie obróbki sekwencyjnej, łączącej operacje kształtowania ubytkowego i bezubytkowego, pozwala na uzyskanie struktury geometrycznej powierzchni (SGP) charakteryzującej się niskimi wartościami parametru Sa oraz korzystnym kształtem krzywej udziału materiałowego.

EN

Results of the topography analysis of selected tool steels for cold working after a sequential process of turning and slide burnishing using a diamond composite end tip with a 10% TiB2 addition are presented. Heat treatment of investigated steel grades were carried out in a vacuum furnace to achieve following hardness: 55 ± 1 HRC (Sverker 21), 59 ± 1 HRC (Vanadis 6), 64 ± 1 HRC (Vanadis 8), 67 ± 1 HRC (Vanadis 60) and 62 ± 1 HRC (Vancron 40). Formed surfaces were analyzed for stereometric features characterizing the surface layer (SL). The results prove that the use of sequential treatment combining removal and non-removal operations allows to obtain a surface geometrical structure (SGS) characterized by low values of the Sa parameter and a favorable shape of the material ratio curve.

2

Distinguishing the Plateau and Valley Components of Profiles From Various Types of Two-Process Textures

Graboń W., Pawlus P.

Metrology and Measurement Systems

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2016

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Vol. 23, nr 4

593--602

EN

This paper presents methods of separating the plateau part for various types of two-process profiles, having the traces of two processes. The traditional method based on the plateau-valley threshold, according to the ISO 13565-3 standard, is not always sufficient, since the valley portion can include plateau roughness. Starting and finishing points of each plateau in the measured profiles should be determined. The procedure found in the technical literature depends on setting not only the plateau-valley threshold but also a lower threshold. This approach was a little modified for profiles that contain both random and deterministic topography components. A new procedure of determination of the lower threshold was proposed for stratified profiles containing two deterministic parts. The valleys can be characterized by their widths and the distance between them. In addition, a description of the material probability curve is proposed.

3

The influence of changing the side angle of the cutting tool by wiper technology on the value of material ratio parameters of steel applied to marine pump shaft pins

Labuda W., Charchalis A.

Journal of KONES

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2015

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Vol. 22, No. 2

139--147

EN

Angular momentum pumps are very often used in cooling circuits of medium and high power engines, power plant boilers as well as bilge, ballast and firefighting installations. Such an extensive use of angular momentum pumps on board is connected with their numerous advantages. However, during operation the wear of marine hull, the rotor and shaft seals take place. The research attempts to increase the service life of shafts. The article presents the research results of pump shaft pins after finish lathing. The research was performed on a roller 60 mm in diameter made of X5CrNi18-10 steel. The finish tooling of pump shaft pins was carried out on a universal CDS 6250 BX-1000 centre lathe. The finish lathing process was carried out by means of Sandvik Coromant cutting tool with replaceable inserts. In the research of lathing, process used inserts with Wiper technology. During the lathing, the optimal cutting parameters were used for inserts: CCMT09T302WF, CCMT09T304WF and CCMT09T308WF. The cutting process was performed at side angle of 90° ± 3°. The process of lathing used cutting tool dynamometer DKM 2010. During the research, the effect of cutting tool geometric on surface roughness parameter Ra of steel applied to marine pumps shaft pins was determined. The article presents the research results of material ratio parameters. In addition provides an examples shaft surface profile analysis and material ratio. Measurement of surface roughness and material ratio parameters was performed by T8000 profilometer.

4

Flame spraying "Roto-Teck 80" of Ni-Al and Ni-Al-Al2O3 coatings surface texture after roller burnishing

Starosta R.

Journal of KONES

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2010

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Vol. 17, No. 4

477-484

EN

The process of flame sprayed is a technology affordable and easy to implement. It does not require greats kill of the operator. This method is not associated with expensive workstation equipment. It may the refore be used with success for the regeneration of machine parts by the crew of vessel engine room. Flame spray ed coatings are characterized by porosity, oxide inclusions presence and large real area of surface. In order to obtain adequate surface roughness coatings must be applied finishing. For this purpose, the turning and grinding are used. In the paper a burnishing to finishing flame sprayed coatings was proposed. Burnishing is not used during the processing of thermally sprayed coatings, as is commonly believed that this technology causes damage to coatings. Coatings of Ni-5% Al and Ni-5%Al-15%Al2O3 obtained by powder flame spraying were studied. Torch of "Roto-Teck 80" was used. After turning the average value of surface coatings roughness coefficient Ra = 3 mi m was obtained. SRMD burnishing tool produced by "Yamato" company was used. Roller burnishing was performer on engine lathe. It was found that the increase in burnishing force and the reduction of burnishing speed and feed rate of less roughness of coatings are obtained. For Ni-5%Al coatings the lowest surface roughness, Ra = 0.3 /mi m was obtained after burnishing with the following parameters: the force - 1100 N, rate - 28m/min, feed - 0.08 mm/rev. During burnishing of Ni-5% Al-15% - A12O3 coatings applied force 700 N, Ra = l pm was obtained. Greater burnishing force caused coatings damage. Burnishing compared to turning has positive influence on the curve shape of the material ratio. It was found that the parameters Rk, Rpk and Rpk were reduced.