Compaction Characteristics of Tungsten Carbide Based Self-Lubricant Cutting Tool Material

2014 ◽  
Vol 592-594 ◽  
pp. 87-91
Author(s):  
A. Muthuraja ◽  
S. Senthilvelan
Keyword(s):  
Tungsten Carbide ◽  
Relative Density ◽  
Solid Lubricant ◽  
Cutting Tool ◽  
Compaction Pressure ◽  
Tool Material ◽  
Work Sample ◽  
Hardness Tester ◽  
Sample Density ◽  
Uniaxial Compaction

In this study, an attempt has been made to develop solid lubricant cutting tool material with the aid of powder metallurgy technique. Chosen tungsten carbide, cobalt and calcium fluoride were milled in the planetary ball milling, followed by uniaxial compaction and sintering in a tube furnace. Materials were milled at various hours of milling and compaction pressure to understand the effect of relative density and hardness of sintered specimens. It is found that the relative density of compacted and sintered specimens found to increase with the compaction pressure but decreased with milling time after particular time. From the investigation, 40 hr of milling and 400 MPa compaction pressure found to be suitable for the development of proposed material. In this work, sample density was measured by the Archimedes’ method and hardness was measured by Rockwell hardness tester.

Performance evaluation of a tungsten carbide–based self-lubricant cutting tool

2016 ◽  
Vol 232 (10) ◽  
pp. 1825-1836 ◽  
Author(s):  
Ayyankalai Muthuraja ◽  
Selvaraj Senthilvelan
Keyword(s):  
Tungsten Carbide ◽  
Cutting Force ◽  
Tool Life ◽  
Solid Lubricant ◽  
Cutting Tool ◽  
Flank Wear ◽  
Cutting Tools ◽  
Chip Morphology ◽  
Machined Surface ◽  
Flank Surface

Tungsten carbide cutting tools with and without solid lubricant (WC-10Co-5CaF2 and WC-10Co) were developed in-house via powder metallurgy. The developed cutting tools and a commercial WC-10Co cutting tool were used to machine cylindrical AISI 1020 steel material under dry conditions. The cutting force and average cutting tool temperature were continuously measured. The cutting tool flank surface and chip morphology after specific tool life (5 min of cutting) were examined to understand tool wear. The flank wear of the considered cutting tools was also measured to quantify the cutting tool life. The surface roughness of the workpiece was measured to determine the machining quality. The developed cutting tool with solid lubricant (WC-10Co-5CaF2) generated 20%–40% less cutting force compared to that of the developed cutting tool without solid lubricant (WC-10Co). In addition, the finish of the workpiece surface improved by 16%–20% when it was machined by the solid lubricant cutting tool. The cutting tool with solid lubricant (WC-10Co-5CaF2) exhibited a 15%–18% reduction in flank wear. Curlier and smaller saw tooth chips were generated from the WC-10Co-5CaF2 cutting tool, confirming that less heat was generated during the cutting process, and the finish of the machined surface was also improved.

Niobcarbid statt Wolframcarbid/Niobium carbide (NbC) instead of tungsten carbide (WC). Potential as an alternative cutting material in turning of C45E, 42CrMo4+QT and AlSi9Cu4Mg

2019 ◽  
Vol 109 (11-12) ◽  
pp. 862-867
Author(s):  
K. Kropidlowski ◽  
E. Uhlmann ◽  
M. Woydt ◽  
G. Theiler ◽  
T. Gradt
Keyword(s):  
Tungsten Carbide ◽  
Material Removal ◽  
Cutting Tool ◽  
Niobium Carbide ◽  
Cutting Speed ◽  
Tool Material ◽  
Substrate Material ◽  
Wear Rates ◽  
Tool Performance ◽  
The Impact

Als mögliche Substitution des konventionellen Hartmetalls Wolframcarbid (WC), wird Niobcarbid (NbC) für den Einsatz in Zerspanwerkzeugen getestet. Es werden verschiedene NbC-Spezifikationen verwendet, die sich in der chemischen Zusammensetzung und den mechanischen Eigenschaften unterscheiden. Trockene Außenrunddrehversuche an Kohlenstoffstahl C45E, Zahnradstahl 42CrMo4+QT und der Aluminiumlegierung AlSi9Cu4Mg werden durchgeführt, um verschiedene NbC-Schneidstoffe mit handelsüblichen WC-Werkzeugen zu vergleichen. Um die Auswirkung einer höheren thermomechanischen Belastung während der Bearbeitung aufzuzeigen, wird die Schnittgeschwindigkeit variiert. Die Zerspanungsleistung aller untersuchten Versuchswerkstoffe wird hinsichtlich Spanvolumen Vw, Kolkverschleiß KT sowie der erreichbaren Oberflächenrauheit Ra und Rz des Werkstücks beurteilt. Im Rahmen der Untersuchungen wird bei erhöhten Schnittgeschwindigkeiten vc eine verbesserte Werkzeugleistung der verschiedenen NbC-Schneidwerkzeuge im Vergleich zum WC-Referenzmaterial aufgezeigt. Der Vergleich der Oberflächenqualität der Werkstoffe nach der Zerspanung zeigt, dass NbC, trotz sporadisch höherer Verschleißraten, vergleichbare Oberflächenqualitäten liefert. Die prototypischen NbC-Schneidstoffe erreichen bei der Zerspanung von C45E ein höheres Spanvolumen Vw als das WC-Referenzsubstrat. Für die Bearbeitung von 42CrMo4+QT und AlSi9Cu4Mg sind Weiterentwicklungen notwendig, um höhere Standzeiten zu erzielen.   In order to investigate a possible substitution of the conventional substrate material tungsten carbide (WC), niobium carbide (NbC) is tested for the use as a cutting tool in turning processes. Different straight NbC materials are applied, differing in chemical composition and mechanical properties. Dry external cylindrical turning tests on carbon steel C45E, gear steel 42CrMo4+QT and aluminium alloy AlSi9Cu4Mg are carried out comparing various NbC based cutting materials with commercially available WC-based tools. Cutting speed is varied to show the impact of higher thermomechanical load during machining. The cutting performance of all investigated cutting tool materials is assessed regarding material removal VW, crater wear KT as well as surface roughness Ra und Rz of the workpiece. Improved tool performance of different NbC cutting tool grades compared to commonly applied WC tool material at increased cutting speeds vc is demonstrated within the investigation. The comparison of the surface quality of the workpiece materials after the cutting process shows that NbC produces comparable surface qualities despite occasional higher wear rates. Prototypical NbC cutting materials achieve a higher material removal VW during the machining of C45E than the WC reference substrate. For the machining of 42CrMo4+QT and AlSi9Cu4Mg, further developments are necessary to achieve longer tool life.

Comparative Study to Analyze the Effect of Tempering during Cryogenic Treatment of Tungsten Carbide Tools in Turning

2011 ◽  
Vol 410 ◽  
pp. 267-270 ◽  
Author(s):  
Nirmal S. Kalsi ◽  
Rakesh Sehgal ◽  
Vishal S. Sharma
Keyword(s):  
Tungsten Carbide ◽  
Cutting Tool ◽  
Cryogenic Treatment ◽  
Tool Material ◽  
Variable Number ◽  
Cutting Conditions ◽  
Conventional Heat Treatment ◽  
Improved Performance ◽  
Tungsten Carbide Tool ◽  
Carbide Inserts

Cryogenic treatment of cutting tool material has been reported improving properties of the materials, resulting improved performance. Tungsten carbide is most accepted and widespread cutting tool material in the industry. Cryogenically treatment of tungsten carbide has shown favorable results. However, still much is unknown about the treatment for improvement in properties of the materials, to make the process identical to the existing conventional heat-treatment process in implementation. Importance of tempering during cryogenic treatment has also been reported, however hardly we find any documentation regarding the effect of the number of tempering cycles during cryogenic treatment. This work is based upon to know the effect of the number of tempering cycles during cryogenic treatment of tungsten carbide tool material. Comparison study was done for untreated and cryogenically treated tungsten carbide inserts following variable number of tempering cycles during the treatment, in turning process. The performance was evaluated in terms of tool wear, power consumption and surface roughness achieved. Cryogenically treated inserts have shown favorable results. At low cutting conditions, performance was better and has not got affected by the number of tempering cycles whereas the number of tempering cycles during cryogenic treatment does effects at high cutting conditions, and two or three tempering cycles has shown better results.

scholarly journals НАУКОВІ ПРИНЦИПИ КОНСТРУЮВАННЯ РІЗАЛЬНОГО ІНСТРУМЕНТУ З НАНОПОКРИТТЯМИ ТА НАНОСТРУКТУРАМИ

2019 ◽  
pp. 81-97
Author(s):  
Геннадий Игоревич Костюк ◽  
Виктор Васильевич Попов
Keyword(s):  
Grain Size ◽  
Chemical Composition ◽  
Tungsten Carbide ◽  
Grain Growth ◽  
Cutting Tool ◽  
Tool Material ◽  
Basic Material ◽  
Ion Energy ◽  
Percentage Composition ◽  
Boron Nitrogen

The article describes the effect of boron, nitrogen, yttrium and hafnium ions on the modified BK10 (WС - 79.7% Co - 9.5% + CrN - 1.3% + AlN - 6.5% + TiN - 3%), BK20 (WС - 80.00%) and VK10 (WС - 90.00%) where the possibility of obtaining nanostructures is shown. It has been determined that: the value of the ion energy and the ion charge significantly affect the grain size with increasing energy and charge size; the grain size increases; an increase in the percentage composition of tungsten carbide leads to grain growth, and with an increase in the mass of the ion to an decrease in the grain size more significantly, which can be used to obtain the required grain size. Тhe design of the chemical composition of the cutting tool material, taking into account the possibility of nanostructure formation, shows that not always an increase in the share of tungsten carbide increases the efficiency and efficiency of the tool, and often the grain size has a decisive influence. The possibility of constructing the chemical composition of the basic material of the cutting tool with regard to its hardening due to the formation of nanostructures and nanocoating is shown

Self-lubricating ceramic cutting tool material with the addition of nickel coated CaF2 solid lubricant powders

2016 ◽  
Vol 56 ◽  
pp. 51-58 ◽  
Author(s):  
Guangyong Wu ◽  
Chonghai Xu ◽  
Guangchun Xiao ◽  
Mingdong Yi ◽  
Zhaoqiang Chen ◽  
...  
Keyword(s):  
Solid Lubricant ◽  
Cutting Tool ◽  
Tool Material ◽  
Ceramic Cutting Tool
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