High Speed Machining of Difficult-to-Machine Materials under Different Lubrication Conditions

2014 ◽  
Vol 625 ◽  
pp. 60-65 ◽  
Author(s):  
Toshiyuki Obikawa ◽  
Tatsumi Ohno ◽  
Ryuta Nakatsukasa ◽  
Mamoru Hayashi ◽  
Tomohiko Tabata
Keyword(s):  
Stainless Steel ◽  
Titanium Alloy ◽  
Tool Life ◽  
High Speed ◽  
Life Extension ◽  
Air Jet ◽  
Flank Face ◽  
Air Nozzle ◽  
Carbide Insert ◽  
Lubrication Conditions

This paper describes the applicability of air jet assisted (AJA) machining to stainless steel and titanium alloy at high cutting speeds in terms of tool wear and tool life. A specially designed tool holder with an air nozzle very close to the tool tip was prepared for turning stainless steel. From the experimental results, it was found that the application of flood coolant from the side of the end flank face leads to better result in tool life in AJA machining of stainless steel than that from the side of the side flank face. The assistance of air jet can improve the tool life of the M35 CVD coated insert in machining of the stainless steel by 36 to 100% under the optimal conditions in comparison with wet machining. It was also found that the air jet assistance extended the tool life of the S10 PVD coated insert by 48% in turning titanium alloy. The tool life extension of the coated insert in AJA machining titanium alloy is much longer than that of an uncoated carbide insert.

Study on High Speed Milling of Steam Turbine Blade Materials

2016 ◽  
Vol 1136 ◽  
pp. 251-256
Author(s):  
Tomonori Kimura ◽  
Takekazu Sawa ◽  
Tatsuyuki Kamijyo
Keyword(s):  
Stainless Steel ◽  
Titanium Alloy ◽  
Steam Turbine ◽  
Turbine Blade ◽  
Tool Life ◽  
High Speed ◽  
Cutting Speed ◽  
High Speed Milling ◽  
Steam Turbine Blade ◽  
Cutting Point

A titanium alloy and stainless steel is an excellent material having properties such as high intensity and high corrosion resistance. Therefore, a titanium alloy and a stainless steel are used as material of steam turbine blade. However, the machining efficiency of a titanium alloy and a stainless steel is a low because of difficult-to-cut materials. Especially, it is a major problem that the cutting point temperature is high and the tool life is short. In the conventional study, it is reported that the cutting point temperature is low and the tool life becomes long by cutting at the suitable cutting speed corresponding to material characteristics. This concept is known as high speed milling. In recent years, the high speed milling is actually used for the metal mold machining. In this study, the high speed milling of the titanium alloy and the stainless steel was tried for the purpose of high efficiency cutting of a steam turbine blade. In the experiment, the cutting tool used the TiAlN coating radius solid end mill made of micro grain cemented carbide. The diameter of endmill is 5mm. The corner radius is 0.2mm. And, the work piece is the titanium alloy Ti-6Al-4V and stainless steel 13Cr. The cutting speed carried out at 100m/min~600m/min. As the result, when the tool life and the surface roughness was a valuation basis, the optimum cutting speed of titanium alloy was 300m/min. On the other hand, In the case of the stainless steel, the flank wear becomes large in proportion to cutting speed. The feature of high speed milling was not able to be confirmed in the range of this experimental condition.

Air Jet Assisted End Milling of Titanium Alloy Ti-6Al-4V ELI at High Cutting Speed

2015 ◽  
Vol 656-657 ◽  
pp. 168-173 ◽  
Author(s):  
Kazutaka Sakurai ◽  
Ryuta Nakatsukasa ◽  
Mamoru Hayashi ◽  
Toshiyuki Obikawa
Keyword(s):  
Titanium Alloy ◽  
Tool Wear ◽  
Tool Life ◽  
End Milling ◽  
Cutting Speed ◽  
New Method ◽  
Life Extension ◽  
Optimal Position ◽  
High Cutting Speed ◽  
Air Jet

This paper is related to the air jet assisted machining method for a titanium alloy, Ti-6Al-4V ELI. The air jet assisted machining method is a new machining method, in which jet of the compressed air is applied to a tool tip together with flood coolant for reducing tool wear and also for extending tool life. In this experimental study, the new method was used in high-speed end milling for confirming the effect on tool life extension. Also, the optimal position of the jet nozzle was found. It was spotted that the new method is highly effective in reducing tool wear even at a high cutting speed. It is particularly noticeable that flank wear near the corner land, which is often severely damaged, was considerably reduced by the method. It turned out that the cutting forces and the degree of surface roughness observed through this method were almost the same as those through an ordinary method with flood coolant alone.

Investigation of Carbon Dioxide Based Blasting Technologies as Cryogenic Deburring Method for Titanium Alloy and Stainless Steel

2018 ◽  
Vol 882 ◽  
pp. 142-153
Author(s):  
Daniel Gross ◽  
Andrea Heinz ◽  
Sven Amon ◽  
Trixi Meier ◽  
Ralf Schmand ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Stainless Steel ◽  
Titanium Alloy ◽  
High Speed ◽  
Metallic Materials ◽  
High Speed Video

This paper aims to expand the use of CO2blasting by investigating a cryogenic deburring method for machined metallic materials. In advance to the actual deburring experiments, a streaming analysis based on high-speed video records was conducted for different blasting technologies, in order to gain deeper knowledge about their underlying active principles. For the titanium alloy Ti-6Al-4V and the stainless steel X6CrNiMoTi17-12-2, deburring experiments with three different blasting techniques were conducted and evaluated. It has been shown that cryogenic deburring has the potential to represent an alternative deburring solution for metals.

Observations of Tool Life and Wear Mechanisms in High Speed Machining of Ti-6Al-4V With PCD Tools Using High Pressure Coolant Supply

2005 ◽  
Author(s):  
E. O. Ezugwu ◽  
J. Bonney ◽  
W. F. Sales ◽  
R. B. da Silva
Keyword(s):  
High Pressure ◽  
Titanium Alloy ◽  
Tool Life ◽  
Wear Mechanisms ◽  
High Speed ◽  
Cutting Tool ◽  
High Speed Machining ◽  
The Past ◽  
Pcd Tools ◽  
High Pressure Coolant

Usage of titanium alloys has increased since the past 50 years despite difficulties encountered during machining. In this study PCD tools were evaluated when machining Ti-6Al-4V alloy at high speed conditions under high pressure coolant supplies. Increase in coolant pressure tend to improve tool life and minimise adhesion of the work material on the cutting tool during machining. Adhesion can be accelerated by the susceptibility of titanium alloy to galling during machining.

Experimental Study of Tool Wear during Quasi High Speed Turning Titanium Alloy with Large Cutting Depth

2014 ◽  
Vol 800-801 ◽  
pp. 548-552
Author(s):  
Li Fu Xu ◽  
Wei Liang Dong ◽  
Shu Tao Huang ◽  
Bao Lin Dai
Keyword(s):  
Experimental Data ◽  
Titanium Alloy ◽  
High Speed ◽  
Flank Wear ◽  
Rake Face ◽  
Cutting Depth ◽  
Tool Flank Wear ◽  
High Speed Turning ◽  
Flank Face ◽  
Cutting Speeds

The wear morphology of rake face and flank face of tool is investigated by turning titanium alloy TC4 with CBN solid tool. It has been observed that the main wear form of rake face and flank face of tool is groove wear. The relation between tool flank wear and cutting speeds, feed rate, and cutting depth obtained from experimental data is given.

Main Factors of Tool Life in the High-speed Cutting of Titanium Alloy

2017 ◽  
Vol 2017 (0) ◽  
pp. S1310105
Author(s):  
Sho NEGITA ◽  
Fumihiro ITOIGAWA ◽  
Shinya HAYAKAWA ◽  
Takashi NAKAMURA
Keyword(s):  
Titanium Alloy ◽  
Tool Life ◽  
High Speed ◽  
High Speed Cutting ◽  
Main Factors

scholarly journals Tool Life Extension Methods for Cut-off Tools Made of High-speed Steel

2016 ◽  
Vol 149 ◽  
pp. 520-525 ◽  
Author(s):  
Karol Vasilko ◽  
Zuzana Murčinková
Keyword(s):  
Tool Life ◽  
High Speed ◽  
High Speed Steel ◽  
Life Extension

Coated cemented carbide tool life extension accompanied by comb cracks: The milling case of 316L stainless steel

Wear ◽  
2019 ◽  
Vol 418-419 ◽  
pp. 133-139 ◽  
Author(s):  
Li Zhang ◽  
Zhi-qiang Zhong ◽  
Lian-chang Qiu ◽  
Hai-dong Shi ◽  
Albir Layyous ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Tool Life ◽  
316L Stainless Steel ◽  
Cemented Carbide ◽  
Life Extension ◽  
Carbide Tool ◽  
Cemented Carbide Tool ◽  
Coated Cemented Carbide

Study on Tool Wear of Cutting Ti-6Al-4V with Water Steam as Coolant and Lubricant in Green Machining

2010 ◽  
Vol 97-101 ◽  
pp. 2365-2368
Author(s):  
Yue Zhang ◽  
Rong Di Han ◽  
Tai Li Sun ◽  
Qi Dong Li ◽  
Xi Chuan Zhang
Keyword(s):  
Titanium Alloy ◽  
Tool Life ◽  
High Speed ◽  
Cutting Speed ◽  
Small Diameter ◽  
Water Steam ◽  
Green Machining ◽  
Water Based ◽  
Cutting Zone ◽  
Steam Cooling

To achieve green machining of titanium alloy Ti-6Al-4V with water steam cooling and lubricating, a 600-800w minitype generator is developed. Compared to dry and water-based emulsion, the using of water steam improves Ti-6Al-4V machinability and prolongs the tool life about 1 time and 0.5 times. And if the same tool life was selected, it would be easy to obtain that as water steam applied the cutting speed can increase about 15% and 10%. As a result, the productivity can be increased. The excellent cooling and lubricating action of water steam could be summarized that water molecule has a small diameter and high speed, can be easily and rapidly to penetrate the capillaries and proceed adsorption in the cutting zone. The results indicate that the using of water steam has the potential to attain the green machining of titanium alloy Ti-6Al-4V.

Tool Wear and Surface Integrity in High Speed Milling of Forging and Cast TA15 Alloys with Coated Carbide Tools

2009 ◽  
Vol 626-627 ◽  
pp. 189-194
Author(s):  
P. Liu ◽  
Jiu Hua Xu ◽  
Yu Can Fu
Keyword(s):  
Titanium Alloy ◽  
Tool Life ◽  
Surface Integrity ◽  
High Speed ◽  
Cutting Tools ◽  
High Speed Milling ◽  
Alpha Titanium ◽  
Series Of Experiments ◽  
Coated Carbide ◽  
Coated Carbide Tools

TA15 (Ti-6.5Al-2Zr-1Mo-1V) is a close alpha titanium alloy strengthened by solid solution with Al and other component. A series of experiments were carried out on normal and high speed milling of TA15. The recommended tools for many years had been the uncoated tungsten carbide grade K. In this work, the tool life of coated carbide tools used in high speed milling of forging and cast titanium alloy was studied. Additionally, the wear mechanism of cutting tools was also discussed. Finally, surface integrity, including surface roughness, metallograph and work hardening, were examined and analyzed. The result shows that the surface quality of forging and cast machined by carbide cutter is similar, but the tool life of carbide in high speed milling of forging TA15 is longer than that in high speed milling of cast TA15.

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