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2 Technical Sciences / University of Warmia and Mazury in Olsztyn

2 2019

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Wear analysis of a gun barrel drill blade in 1.0503 steel drilling process in Milpro HG12 oil environment with addition of ultra-dispersive copper particles and copper oxides

Rychlik Kazimierz, Senderowski Cezary

Technical Sciences / University of Warmia and Mazury in Olsztyn

2019

nr 22(3)

221--235

This paper presents structural solutions for guiding a single-sharp barrel drill blade during deep hole drilling, and it analyzes the structural and technological problems associated with two modes of inserting the drill into the processed material in the first stage of drilling – with the use of a pilot hole or a guide sleeve. The kinematics of the object-tool system (P-N) and other technological parameters affecting the execution of pilot holes under strictly defined conditions were analyzed during deep drilling with barrel drills in the FNE 40NC AVIA vertical numerical milling machine. Performance tests involving two types of cooling-lubricating agents, Milpro HG12 oil with and without the addition of ultra-dispersive copper particles and copper oxides (0.05 ÷ 0.6 µm) and Panther GP-1 additive (PWPH PantherOil Poland), applied in a 1:100 ratio, were described. The wear of the barrel drill blade along the entire drilling path (Lw = 8,000 mm) for 112 holes, and the geometric wear coefficient Kw of the drill bit were determined in 1.0503 steel with the use of EB80 drills made of K15 cemented carbide (WC 94%, Co 6%) with a diameter Dc = 8 mm. The results of wear tests were compared with the results of tribological tests involving cooling lubricants and 1.0503 steel with the chemical composition of K15 tungsten carbide. The abrasive wear of friction pair and the performance of the barrel drill blade during deep hole drilling were analyzed under identical conditions.

Influence of gas detonation spraying parameters on the geometrical structure of Fe-Al intermetallic protective coatings

Chrostek Tomasz, Bramowicz Mirosław, Rychlik Kazimierz, Wojtkowiak Adam, Senderowski Cezary

Technical Sciences / University of Warmia and Mazury in Olsztyn

2019

nr 22(3)

249--262

The paper presents the results of an analysis of the geometrical structure of Fe-Al intermetallic protective coatings sprayed under specified gun detonation spraying (GDS) conditions. Two barrel lengths, two powder injection positions (PIP) at the moment of spark detonation, and two numbers of GDS shots with 6.66 Hz frequency were applied as variable parameters in the GDS process. Surface profile measurements were conducted by contact profilometry with the use of the TOPO-01 system and the Mitutoyo SJ 210 profilometer. The measured parameters were used to analyze surface topography in two-dimensional (2D) and three-dimensional (3D) systems. It was assumed that roughness can be regarded as a non-stationary parameter of variance in surface amplitude which is highly dependent on the sampling rate and spraying distance. Therefore, changes in surface amplitude parameters and functional properties were analyzed across segments with a length (ln) of 1.25, 4 and 12.5 mm. The development of the geometric structure of the surface was analyzed with the RMS (Root Mean Square) fractal method, and the geometric structure of the surface stretched by several orders of magnitude was evaluated based on the correlation between roughness (Rq), segment length (ln) and fractal dimension (D). The RMS method and the calculated fractal dimension (D) supported the characterization of the geometric structure of intermetallic Fe-Al protective coatings subjected to GDS under the specified process conditions based on the roughness profiles of surface segments with a different length (ln).