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Your search keyword '"Piska, Miroslav"' showing total 4 results
Start Over Author "Piska, Miroslav" Topic milling
4 results on '"Piska, Miroslav"'

2. ON THE EFFECTIVE SUBSTITUTION OF TURNING BY PERIPHERAL MILLING.

Author

Piska, Miroslav and Kolomy, Stepan

Subjects
*CUTTING tools, *CARBIDE cutting tools, *MILLING cutters, *STAINLESS steel, *MACHINE tools, *PRODUCTION (Economic theory), *ASSEMBLY machines
Abstract

Turning operation seems to by prevailing for a production of rotational parts with standard demands on quality on machined surfaces. However, there are some applications that prevent effective use of the technology due to chip removal, entwining, clogging that prevents safe cooling of the turning tools and it ends frequently in a tool fracture or damage of the machined surface. Milling technology can suppress many of these problems, because the machining action is interrupted, chip is short and the cutting tool can machine even more surfaces in parallel. A difficult to machine welded assembly of stainless steel materials (the austenitic EN 1.4307 and the ferritic EN 1.4511) of profiled workpiece shape was selected for a substitution of the standard turning using several cutting tools by a milling and just one PVD coated monolithic cemented carbide tool. The series production of the part was selected and all quality parameters were first predicted, monitored and optimized. Finally, the economics of the production was assessed in terms of productivity and costs. All results confirmed a very stabilized production of good surface quality and long endurance of the milling tool (machined more then 30,000 pieces with one milling cutter). [ABSTRACT FROM AUTHOR]

Published
2021
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3. POLYNOMIAL INTERPOLATION IN 5-AXIS MILLING.

Author

OHNISTOVA, PETRA, PISKA, MIROSLAV, and PRAT, DAVID

Subjects
MILLING (Metalwork), SUPERPOSITION principle (Physics), MATHEMATICAL analysis, SPLINE theory, POLYNOMIALS
Abstract

This study is an introduction to the five-axis milling using polynomial interpolation approach. Progressive milling technologies using different spline interpolations in the control system Sinumerik 840D were compared for a defined number and distributions of the controls points of a planar curve. A tool trajectory for the five-axis CNC milling of a concave profile was generated as the superposition of the third order polynomials, that had been generated with a special algorithm in Mathematica. [ABSTRACT FROM AUTHOR]

Published
2018
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4. A NEW DESIGN OF ROUGHING MILLING CUTTER AND ITS MACHINING PERFORMANCE.

Author

PISKA, MIROSLAV and JAROS, ALES

Subjects
MILLING cutters, MACHINING, TOOL-steel, PRECISION casting, STRAINS & stresses (Mechanics), PHYSICAL vapor deposition
Abstract

This paper deals with a new roughing milling cutter design made of high-speed steel by precision casting technology. Each edge of the innovated milling cutter has two special flutes that make so-called compensation edges which help to reduce tensile stress in the end of cutting teeth. Three kinds of PVD coatings ((Al,Ti)N, (Al,Ti,Cr)N and nanocomposite nACo) were used to preserve the tool life. The coatings were made with a cathodicarc deposition process. Machining tests were carried out on the vertical milling machine FB 32V. Cutting conditions were constant and standard carbon steel C45 DIN EN ISO 4957 (W.Nr. 1.1191) was used as workpiece material. Monitored parameters were force loading and flank wear measured with Stemi 2000 Zeiss. Dynamometer Kistler 9575B/SW DynoWare were used for measuring of instantaneous force loading in long time series. The results confirm a good cutting performance of the new tool. [ABSTRACT FROM AUTHOR]

Published
2016
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