Publication detail
On the effective reaming of austenitic steels with cermet reamers and flood cooling
SLANÝ, J. POLZER, A. PÍŠKA, M.
Czech title
Účinné obrábění austenitických ocelí cermetovými výstružníky
English title
On the effective reaming of austenitic steels with cermet reamers and flood cooling
Type
conference paper
Language
en
Original abstract
Reaming operation is a common technological process which enlarges a pre-existing hole. For austenitic steels, IT 5-6 and roughness bellow Ra 0.8 um are achieved today by cermet and diamond cutting tools operating with cutting speeds about 100 m/min. However, a high productive reaming relies upon good cutting material and coating, its design, cutting performance, correct alignment of a pre-drilled hole and powerful process cooling. In this operation, specific cutting forces can be found with effect on cutting performance and quality of the machined surfaces. Since little material is removed, reaming operation can be split into several time-phases of cutting with different cutting and tribological phenomena. This paper deals with a effective use of a solid carbide drill, a semi-finishing carbide boring head and powerful cermet reamers for CNC machining of stainless steel DIN 1.4404, X2CrNiMo1732 (equivalent standard AISI 316L). Kistler dynamometer 9272, charge amplifiers 9011 and the Dynoware program for total force loading of the samples were used. A new 5-axis machining centre MCV 1210 (ZPS-TAJMAC, share company, Zlin) controlled with Sinumerik 840D, thermogrips Bilz, HAM-FINAL cermet reamers and holders, and a special precise fixture for workpiece preventing its deflection was used. The Fuchs Oil emulsion (10% concentration, 60 bars in pressure, flood intensity 50 l/min) and outer system of cooling for the monolithic cermet reamers were used. The Taylor Hobson Form Talysurf PGI 400 profiler and measuring probe Renishaw OMP400 with SW Productivity+ were used for surface quality evaluation. Some works dealing with high dimensional accuracy, roundness and cylindricity measurements are still in progress. Selected variables like specific energy of reaming, coefficient of flank friction of the guide pads and other physical and technological variables are statistically assessed.
Czech abstract
Vystružování je technologická operace rozšiřující předzhotovenou díru. U austenitických ocelí lze dosáhnout přesnosti IT 5-6 a drsnosti pod Ra 0,8um s cermetovými a diamantovými nástroji při řezné rychlosti 100 m/min. Tato práce se zabývá CNC obráběním austenitické oceli DIN 1.4404, X2CrNiMo1732 (AISI 316L). Dále byl použit dynamometr Kistler 9272, nábojové zesilovače 9011, SW Dynoware pro měření zatížení vzorků, 5-osé centrum MCV 1210 (ZPS-TAJMAC, a.s. Zlin) řízené Sinumerikem 840D, thermoupínače Bilz a výstružníky HAM-FINAL. Emulze Fuchs Oil (10% 60 barů, 50 l/min) vnější chlazení, Taylor Hobson Form Talysurf PGI 400 profilometr a sonda Renishaw OMP400 SW Productivity+ . Vyhodnocovány byly kruhovitost a válcovitost děr, drsnost povrchu, měrná energie vystružování, součinitel tření. Technologii lze doporučit pro podobné aplikace.
English abstract
Reaming operation is a common technological process which enlarges a pre-existing hole. For austenitic steels, IT 5-6 and roughness bellow Ra 0.8 um are achieved today by cermet and diamond cutting tools operating with cutting speeds about 100 m/min. However, a high productive reaming relies upon good cutting material and coating, its design, cutting performance, correct alignment of a pre-drilled hole and powerful process cooling. In this operation, specific cutting forces can be found with effect on cutting performance and quality of the machined surfaces. Since little material is removed, reaming operation can be split into several time-phases of cutting with different cutting and tribological phenomena. This paper deals with a effective use of a solid carbide drill, a semi-finishing carbide boring head and powerful cermet reamers for CNC machining of stainless steel DIN 1.4404, X2CrNiMo1732 (equivalent standard AISI 316L). Kistler dynamometer 9272, charge amplifiers 9011 and the Dynoware program for total force loading of the samples were used. A new 5-axis machining centre MCV 1210 (ZPS-TAJMAC, share company, Zlin) controlled with Sinumerik 840D, thermogrips Bilz, HAM-FINAL cermet reamers and holders, and a special precise fixture for workpiece preventing its deflection was used. The Fuchs Oil emulsion (10% concentration, 60 bars in pressure, flood intensity 50 l/min) and outer system of cooling for the monolithic cermet reamers were used. The Taylor Hobson Form Talysurf PGI 400 profiler and measuring probe Renishaw OMP400 with SW Productivity+ were used for surface quality evaluation. Some works dealing with high dimensional accuracy, roundness and cylindricity measurements are still in progress. Selected variables like specific energy of reaming, coefficient of flank friction of the guide pads and other physical and technological variables are statistically assessed.
Keywords in Czech
výstružník, austenit, cermet
Keywords in English
reamer, austenite, cermet
RIV year
2011
Released
03.05.2011
Publisher
The Swedish Production Academy
Location
Lund
ISBN
978-91-86401-05-4
Book
Proceedings of the SPS 11
Edition number
1
Pages from–to
228–234
Pages count
7
BIBTEX
@inproceedings{BUT36059,
author="Aleš {Polzer} and Jan {Slaný} and Miroslav {Píška} and Martin {Slaný},
title="On the effective reaming of austenitic steels with cermet reamers and flood cooling",
booktitle="Proceedings of the SPS 11",
year="2011",
month="May",
pages="228--234",
publisher="The Swedish Production Academy",
address="Lund",
isbn="978-91-86401-05-4"
}