Large ship's turning test and its security

2013 ◽  
Author(s):  
Kai Zhang ◽  
Hongyan Hao
Keyword(s):  
Turning Test

Tribological Influences of TiAlN Coating on Tool Wear for High-Speed Dry and Wet Machining of Steels

2004 ◽  
Author(s):  
Y. J. Lin ◽  
Samir A. Khrais
Keyword(s):  
High Speed ◽  
High Speed Machining ◽  
Structural Variations ◽  
Edge Chipping ◽  
Coated Tools ◽  
Coated Tool ◽  
Carbide Inserts ◽  
Turning Test ◽  
Cemented Carbide Inserts ◽  
Cutting Speeds

The tribological influences of PVD-applied TiAlN coatings on the wear of cemented carbide inserts and the microstructure wear behaviors of the coated tools under dry and wet machining are investigated. The turning test was conducted with variable high cutting speeds ranging from 210 m/min to 410m/min. The analyses based on the experimental results lead to strong evidences that conventional coolant has a retarded effect on TiAlN coatings under high-speed machining. Microwear mechanisms identified in the tests through SEM micrographs include edge chipping, micro-abrasion, micro-fatigue, micro-thermal, and micro-attrition. These micro-structural variations of coatings provide structure-physical alterations as the measures for wear alert of TiAlN coated tool inserts under high speed machining of steels.

Mit Einzelzähnen schneller zum Verschleiß*/Faster to wear with single teeth

2019 ◽  
Vol 109 (01-02) ◽  
pp. 8-13
Author(s):  
H.-C. Möhring ◽  
R. Eisseler ◽  
H. Ghassemi ◽  
Keyword(s):  
Machine Tools ◽  
Circular Saw ◽  
Single Tooth ◽  
The University ◽  
Turning Test

Standzeittests an Kreissägewerkzeugen sind in der Regel zeit- und materialintensiv. Am Institut für Werkzeugmaschinen (IfW) der Universität Stuttgart wird der Aufwand mithilfe von Einzahnversuchen deutlich verringert. Die Versuche basieren auf einem Leistendrehtest, der sich an die ehemalige VDI-Richtlinie VDI 3324 anlehnt und auf Drehmaschinen durchgeführt werden kann. Durch einfach gestaltete, wechselbare Leisten entsteht eine für das Sägen typische Schnittunterbrechung und es können beliebige Werkstoffe berücksichtigt werden.   Live time tests on circular saw tools are usually time-consuming and material-intensive. At the Institute for Machine Tools (IfW) of the University of Stuttgart, the required effort can be significantly reduced by conducting single tooth tests. The tests are based on a block turning test which adopts the former VDI guideline VDI 3324 and can be used on lathes. Simply designed and exchangeable blocks allow the typical cut interruption for sawing and consider any materials.

Influence of On-the-Machine Laser Hardening on Machinability of Carbon Steel in Turning

2009 ◽  
Vol 407-408 ◽  
pp. 690-693
Author(s):  
Takahiko Kusano ◽  
Ryutaro Tanaka ◽  
Akira Hosokawa ◽  
Takashi Ueda ◽  
Tatsuaki Furumoto ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Carbon Steel ◽  
Hardened Steel ◽  
Laser Hardening ◽  
Hardened Zone ◽  
Spiral Form ◽  
Aisi 1045 ◽  
Steel Aisi ◽  
Turning Test ◽  
Continuous Chip

This study deals with the influence of laser hardening for a carbon steel AISI 1045 on machinability in turning. Turning test was conducted for the purpose to clarify the influence of laser hardening for steel surface on the chip controllability and surface roughness. In turning laser hardened steel, continuous chip is broken in the laser hardened zone during cutting due to higher brittleness. The broken chips have spiral form and their length is approximately equal to those generated by less than 10 revolution cutting. The surface roughness shows slightly lower compared with non-laser hardened steel.

Influence of Particle Size on Machinability Behavior in Turning of AA6061-AlN Composites

2019 ◽  
Vol 6 (1) ◽  
pp. 53-74
Author(s):  
Arumugam Mahamani
Keyword(s):  
Surface Roughness ◽  
Cutting Force ◽  
Flank Wear ◽  
Cutting Speed ◽  
Dimensional Accuracy ◽  
Reinforced Composite ◽  
Current Article ◽  
Machining Rate ◽  
Particle Reinforced Composite ◽  
Turning Test

Machinability of the composites and achieving the dimensional accuracy in addition to surface finish at an economic machining rate is still the topic for numerous researchers. The current article describes the variation in machinability characteristics of AA6061-AlN composites under various sizes of reinforcements. Cutting speed, cutting depth and feed rate are preferred to perform the turning test. Cutting force, surface roughness and flank wear are identified to appraise the machinability characteristics. For an identical machining condition, the nano particle reinforced composite has less surface roughness and minimal flank wear and a greater cutting force than the other composites. An increment in cutting speed raises the flank wear and declines the surface roughness and cutting force for all composites. The findings from the experimental investigation help to utilize the turning process for machining the composites with various sizes of reinforcement at the economic rate of machining without compromising the surface quality.

The Turning Test with Small Regulable Stimuli

1948 ◽  
Vol 62 (4) ◽  
pp. 236-240 ◽  
Author(s):  
J. J. Groen ◽  
L. B. W. Jongkees
Keyword(s):  
Turning Test

Performance of Alcoholics and Non-Drinkers on Two French Tests for Alcoholism

1974 ◽  
Vol 34 (3) ◽  
pp. 815-818 ◽  
Author(s):  
J. Harry Feamster ◽  
Wilma J. Knox
Keyword(s):  
Control Group ◽  
Turning Test

Two tests from a French battery, the Mira and Turning tests, were administered to 9 alcoholic males and 9 relatively abstemious males. Ss were matched on the basis of age. The qualitatively scored Mira test was submitted to judges in pairs. Seven judges made 55 correct identifications ( p < .001). Three sets of objective scores from the Turning test yielded significant differences between the alcoholic group and the control group. The French battery of tests is considered to merit further investigation.

Identification of Nonlinear Ship Model Parameters Based on the Turning Circle Test

2007 ◽  
Vol 51 (02) ◽  
pp. 174-181
Author(s):  
Manuel Haro Casado ◽  
Ramón Ferreira ◽  
F. J. Velasco
Keyword(s):  
Model Parameters ◽  
Steering Control ◽  
Adaptive Procedure ◽  
Ship Model ◽  
Ship Steering ◽  
Trial Test ◽  
Turning Radius ◽  
Additional Coefficient ◽  
Turning Test ◽  
True Values

This work presents a contribution to solving the problem of identification of ship model parameters using the experimental results from a particular trial test. The innovation of this paper lies in the fact that for this identification purpose it is necessary to know only the turning radius that describes the ship during the performance of the turning test trial. A relatively complex nonlinear model of Norrbin has been chosen as a basis because it represents the ship's dynamics appropriately, as proven through experimental measurements obtained during the course change test. The proposed algorithm of identification of the four ship model parameters is based on an adaptive procedure and the backstepping theory. Another additional coefficient can be determined by an alternative procedure. The knowledge of the true values that characterize the dynamic of a ship is fundamental in the ship steering control that is carried out by autopilots. The simulation results show the suitability of the proposed procedure.

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