Wyniki wyszukiwania - BazTech

1

Tribological studies of monolithic drawing dies for the production of reinforcing wires used in construction

Náprstková Nataša, Kruzel Robert, Dembiczak Tomasz

Budownictwo o Zoptymalizowanym Potencjale Energetycznym

|

2022

|

Vol. 11

23--30

EN

Cold drawn products are widely used in the construction industry. Drawn products are obtained by a drawing process in which the most important tool is the drawing tool. Drawn products include wire, bar and pipe. The material used in this study was a drawing die mesh made of sintered carbide, grade H10S. The abrasive wear analysis of prepared samples was carried out using the ball on disc method with a ZrO2 ceramic ball. Hardness measurements were carried out using the Vickers method in accordance with the PN-EN 23878:1996 standard. The resistance to brittle fracture was determined based on the length of the measurement of cracks formed at the corners of the impression.

2

Specific Cutting Conditions of 100Cr6 Steel Grinding and Selected Final Roughness Parameters

Náprstková Nataša, Novák Martin, Sviantek Jan

Advances in Science and Technology. Research Journal

|

2020

|

Vol. 14, no 2

184--189

EN

Grinding of hardened steels is often an important used technology at finishing. Products made from these materials in mechanical engineering are often used, and a quality of the workpiece surface roughness after grinding is one of the important parameters that to us speaks about the quality of the machining process. The paper deals with the influence of the selected cutting conditions when grinding bearing steel 100Cr6 (EN 10027–1) on their machined surface roughness.

3

Analyses of calcium influence on the AlSi9CuMnNi alloy

Náprstková Nataša, Kraus Pavel, Cais Jaromír, Stančeková Dana, Miturska Izabela

Advances in Science and Technology. Research Journal

|

2018

|

Vol. 12, no 3

32--38

EN

Treatment of metal alloys is one of the ways to affect the properties of the material. The article describes an experiment realized at FPTM UJEP when was experimentally studied the influence of alloys AlSi9CuMnNi calcium modification on some of its properties. The alloy was modified with various amounts of calcium and subsequently machining. Also hardness was measured in the resulting alloys. Machining was performed under certain cutting conditions. After machining the obtained chip was evaluated. Chip was evaluated for its shape, length and amount of chips per 100 g. Devices in FPTM laboratories were used to prepare experimental casts and to evaluate hardness and chips, like the melting furnace LAC K70/13, hardness tester Ernst AT 250X or microscope Olympus SZX 10. Experimental quantities of calcium was 0.05, 0.1 and 0.15 wt. %. Presented experiments are part of the extensive research undertaken at Faculty of Production Technologies and Management at Jan Evangelista Purkyně University in Ústí nad Labem.

4

An Impact of Technological Conditions on Surface Burning in Grinding of the Orbit

Stančeková Dana, Mrázik Jozef, Rybicka Iwona, Náprstková Nataša, Kraus Pavel

Advances in Science and Technology. Research Journal

|

2018

|

Vol. 12, no 4

19--27

EN

A process of quality development helps us reveal concrete deficiences, an analysis of their origin and realization of required modifications that are needed to solve a concrete problem. One of the aims of quality development of production in bearing industries is to find out an impact of tchnological conditions to form burning of surfaces in grinding of orbits of bearing rings. We try to describe an origin of the problem, to find reasons of burned surfaces in a process of grinding and to propose such technological conditions to avoid above-stated problems and to produce the least possible number of non-identical workpieces. To lower a number of burnings in grinding of the orbit to zero percentage is not real, however, we have to try to get a minimal number of parts with damaged surface.