Surface Pressure Treatment of Titanium Alloy Bars by Transverse Rolling

2019 ◽  
Vol 946 ◽  
pp. 744-749 ◽  
Author(s):  
Aleksey Antimonov ◽  
Nadezhda Pushkareva
Keyword(s):  
Surface Roughness ◽  
Corrosion Resistance ◽  
Titanium Alloy ◽  
Titanium Alloys ◽  
Surface Pressure ◽  
Ultrasonic Testing ◽  
Cutting Tool ◽  
Experimental Studies ◽  
Pressure Treatment ◽  
Metal Microstructure

The results of the process experimental studies of titanium alloys transverse rolling bars are presented. The efficiency of using such a process for reducing the surface roughness is shown. The samples were tested after rolling on corrosion-resistance resistance, ultrasonic testing, and also the study of the metal microstructure was made. For the bars transverse rolling in industrial conditions, a tooling was developed and created, intended for installation on operating centerless lathes instead of tooling with a cutting tool. Production tests of new equipment has shown its good performance.

scholarly journals Experimental Investigation on Machinability of Titanium Alloy by Laser-Assisted End Milling

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1552
Author(s):  
Dong-Hyeon Kim ◽  
Choon-Man Lee
Keyword(s):  
Surface Roughness ◽  
Experimental Investigation ◽  
Titanium Alloy ◽  
Titanium Alloys ◽  
Cutting Force ◽  
Cutting Tool ◽  
End Milling ◽  
Chemical Reactivity ◽  
Depth Of Cut ◽  
Laser Assisted Machining

The Machining of titanium alloys is challenging because of their high strength, low thermal conductivity, high chemical reactivity, and high stresses at the cutting tool edges. Laser-assisted machining is an effective way to improve the machinability of titanium alloys. This paper presents an experimental investigation of the machinability of cutting force and surface roughness in laser-assisted end milling of titanium alloy Ti-6Al-4V. The absorptivity of Ti-6Al-4V was determined by conducting preheating experiments using a high-power diode laser with a wavelength of 940–980 nm. A thermal analysis was performed using the finite element method to predict temperature distribution. The depth of cut was determined where tensile strength decreased sharply, and the predicted surface temperature is presented in the analysis results. The experiments were performed with conventional machining and laser-assisted machining. Surface roughness, tool wear, and cutting force were evaluated. In contrast to the results of conventional end milling, laser-assisted end milling improved surface roughness. Moreover, laser-assisted end milling proved more effective than conventional end milling in terms of cutting tool damage. Our results proved that heat assistance significantly influenced the magnitude of the cutting forces—while the actual reduction in forces varied slightly depending on the force component, cutting tool, and cutting conditions, force components showed a reduction of roughly 13–46%.

scholarly journals INVESTIGATION OF THE METHOD OF PROCESSING HOLES WITH A ROTARY CUP CUTTER WITH SURFACING

2021 ◽  
pp. 1-6
Author(s):  
Bakytzhan Donenbayev ◽  
Karibek Sherov ◽  
Assylkhan Mazdubay ◽  
Aybek Sherov ◽  
Medgat Mussayev ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Cutting Tool ◽  
Large Diameter ◽  
Cutting Tools ◽  
Experimental Studies ◽  
Surface Hardness ◽  
Hard Metal ◽  
Metal Plates ◽  
Study Results ◽  
The Cost

This article presents the experimental study results of the process of rotational friction holes boring using a cup cutter surfaced by STOODY M7-G material. As a result of experimental studies, the following quality indicators were achieved: surface roughness within Ra=10÷1,25 micrometer; surface hardness within HB 212-248. Using a cup cutter surfaced by STOODY M7-G material in case of rotational friction boring of large-diameter holes for large-sized parts can improve processing performance in comparison with cutting tools equipped with hard metal plates and provided the required surface roughness. Preliminary calculations showed that the manufacture of cup cutters from non-instrumental materials reduces the cost of the cutting tool by 5-7 times and the cost of the operation by 1.5-2 times.

scholarly journals Cutting Parameter Optimization in Finishing Milling of Ti-6Al-4V Titanium Alloy under MQL Condition using TOPSIS and ANOVA Analysis

2021 ◽  
Vol 11 (1) ◽  
pp. 6775-6780
Author(s):  
V. C. Nguyen ◽  
T. D. Nguyen ◽  
D. H. Tien
Keyword(s):  
Surface Roughness ◽  
Titanium Alloy ◽  
Titanium Alloys ◽  
Contact Area ◽  
Removal Rate ◽  
Multiple Criteria Decision Making ◽  
Machining Process ◽  
Anova Analysis ◽  
Wide Range ◽  
Cutting Parameter Optimization

Titanium and its alloys give immense specific strength, imparting properties such as corrosion and fracture resistance, making them the right candidate for medical and aerospace applications. There is a wide range of engineering applications that use titanium alloys in a variety of forms. The cost of these alloys is slightly higher in comparison to other variants due to the problematic extraction of the molten process. To reduce costs, titanium alloy products could be made by casting, isothermal forging, radial swaging, or powder metallurgy, although these techniques require some kind of finishing machining process. Titanium and its alloys are difficult to machine due to skinny chips leading to a small cutting tool-workpiece contact area. The thermal conductivity of titanium alloys is too low and the stress produced is too large due to the small contact area, which results in very high cutting temperatures. This paper deals with the experimental study of the influence of the Minimum Quantity Lubricant (MQL) environment in the milling of Ti-6Al-4V alloy considering the optimization of surface roughness and production rate. Taguchi-based TOPSIS and ANOVA were used to analyze the results. The experimental results show that MQL with vegetable oil is successfully applied in the milling of Ti-6Al-4V. The research confirms the suitability of TOPSIS in solving the Multiple Criteria Decision Making (MCDM) issue, by choosing the best alternative at Vc=120m/min, fz=0.065mm/tooth, and ap=0.2mm, where the surface roughness and material removal rate are 0.41µm and 44.1492cm3/min respectively. Besides, ANOVA can be used to predict the best parameters set in the milling process based on the regression model. The parameters predicted by ANOVA analysis do not coincide with any implemented parameters

scholarly journals Corrosion Resistance and Surface Bioactivity of Ti6Al4V Alloy after Finish Turning under Ecological Cutting Conditions

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6917
Author(s):  
Kamil Leksycki ◽  
Agnieszka Kaczmarek-Pawelska ◽  
Kamil Ochał ◽  
Andrzej Gradzik ◽  
Danil Yurievich Pimenov ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Corrosion Resistance ◽  
Titanium Alloy ◽  
Electrochemical Impedance ◽  
Ti6al4v Alloy ◽  
Cutting Conditions ◽  
Practical Significance ◽  
Molar Ratio ◽  
Finish Turning ◽  
Ti6al4v Titanium Alloy

The influence of cooling conditions and surface topography after finish turning of Ti6Al4V titanium alloy on corrosion resistance and surface bioactivity was analyzed. The samples were machined under dry and minimum quantity lubrication (MQL) conditions to obtain different surface roughness. The surface topographies of the processed samples were assessed and measured using an optical profilometer. The produced samples were subjected to electrochemical impedance spectroscopy (EIS) and corrosion potential tests (Ecorr) in the presence of simulated body fluid (SBF). The surface bioactivity of the samples was assessed on the basis of images from scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) analysis. The inspection of the surfaces of samples after turning under dry and MQL conditions revealed unevenly distributed precipitation of hydroxyapatite compounds (Ca/P) with a molar ratio in the range of 1.73–1.97. Regardless of the cutting conditions and surface roughness, the highest values of Ecorr ~0 mV were recorded on day 7 of immersion in the SBF solution. The impedance characteristics showed that, compared to the MQL conditions, surfaces machined under dry conditions were characterized by greater resistance and the presence of a passive layer on the processed surface. The main novelty of the paper is the study of the effect of ecological machining conditions, namely, dry and MQL cutting on the corrosion resistance and surface bioactivity of Ti6Al4V titanium alloy after finish turning. The obtained research results have practical significance. They can be used by engineers during the development of technological processes for medical devices made of Ti6Al4V alloy to obtain favorable functional properties of these devices.

Machinability of Heat-Resistant Titanium Alloys during Turning

2021 ◽  
Vol 1022 ◽  
pp. 62-70
Author(s):  
Tatyana Larionova ◽  
Sergei A. Lyubomudrov ◽  
Evgeniy Larionov
Keyword(s):  
Mathematical Model ◽  
Titanium Alloy ◽  
Titanium Alloys ◽  
Experimental Research ◽  
Cutting Tool ◽  
Technological System ◽  
Elastic Deformations ◽  
Heat Resistant ◽  
Processing Modes ◽  
Mechanical And Service Properties

The article discusses the properties and features of heat-resistant titanium alloys. The microstructure of a new titanium alloy VT41, its mechanical and service properties after various processing modes are presented. The main problems in the machining of difficult-to-machine titanium alloys are considered. The developed mathematical model of the formation of errors in turning titanium alloys, taking into account thermal deformations and dimensional wear of the cutting tool, elastic deformations of the technological system, is described. The paper presents the results of experimental research on turning of heat-resistant titanium alloy VT41 on a multi-parameter stand.

Small Diameter Drilling Of Titanium Alloys on CNC Turning Machine

2014 ◽  
Vol 11 (2) ◽  
pp. 5-8
Author(s):  
Andrej Czan ◽  
Anton Martikan ◽  
Jozef Pustay ◽  
Viktor Kuzdak ◽  
Jozef Mrazik
Keyword(s):  
Corrosion Resistance ◽  
Titanium Alloy ◽  
Titanium Alloys ◽  
Automotive Industry ◽  
Small Diameter ◽  
Basic Research ◽  
Cnc Turning ◽  
Pvd Coating ◽  
Drill Bits ◽  
Drilling Conditions

Abstract The article deals with drilling of titanium alloys, which are becoming more widely used in aerospace and automotive industry as well as in other sectors for its specific properties such as hardness, corrosion resistance, biocompatibility, etc. The aim of this article is basic research with focus on drilling conditions of titanium alloy using HSS drill bits with diameter ø2,3 mm with PVD coating and without coating on CNC turning machine Polygim Diamond 12 series. This research can support problem solutions in small diameter drilling.

scholarly journals A low-cost machinability approach to accelerate titanium alloy development

2020 ◽  
pp. 095440542093786
Author(s):  
Chris Dredge ◽  
Rachid M’Saoubi ◽  
Ben Thomas ◽  
Oliver Hatt ◽  
Meurig Thomas ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Tool Wear ◽  
Titanium Alloys ◽  
Cutting Tool ◽  
Metal Removal ◽  
Low Cost ◽  
Small Scale ◽  
Alloy Development ◽  
Process Step ◽  
Machining Properties

Machining is often the most expensive manufacturing process step when producing titanium alloy components. With a move towards higher metal removal rates to meet aircraft orders, it is important to develop rapid, low-cost methods that assess the machinability of titanium alloys and cutting tool combinations. A cost-effective, small-scale methodology has been developed and validated on the industrial scale using high-speed turning to inform on the machining characteristics of commercial and emerging titanium alloys to aid companies in future developments of new titanium alloys and cutting tool materials. The article demonstrates, using the titanium alloys Ti-6Al-4V (Ti-64) and TIMETAL 407® (Ti-407), that a series of early stage, small-scale methods can identify key machinability characteristics including chip form, tool wear, cutting force and surface damage. It can be concluded using these low-cost machinability assessment methods that Ti-407 exhibits better machining properties to Ti-64 for the aspects of machinability focused on cutting forces and tool wear, whereas the contrary is found for subsurface microstructural features and chip control.

Rotary Ultrasonic Machining of Titanium Alloy: A Feasibility Study

2005 ◽  
Author(s):  
N. J. Churi ◽  
Z. C. Li ◽  
Z. J. Pei ◽  
C. Treadwell
Keyword(s):  
Experimental Study ◽  
Surface Roughness ◽  
Titanium Alloy ◽  
Tool Wear ◽  
Titanium Alloys ◽  
Cutting Force ◽  
Aerospace Industry ◽  
Ultrasonic Machining ◽  
Rotary Ultrasonic Machining ◽  
Conventional Machining

Due to their unique properties, titanium alloys are attractive for some unique applications especially in the aerospace industry. However, it is very difficult to machine these materials cost-effectively. Although many conventional and non-conventional machining methods have been reported for machining them, no reports can be found in the literature on rotary ultrasonic machining of titanium alloys. This paper presents an experimental study on rotary ultrasonic machining of a titanium alloy. The tool wear, cutting force, and surface roughness when rotary ultrasonic machining of the titanium alloy have been investigated using different tool designs and machining conditions. The results are compared with those when machining the same material with diamond grinding.

scholarly journals Influence of Different Dielectrics on Process Performance for Electrical Discharge-Assisted Milling of Titanium Alloy

2022 ◽  
Author(s):  
Moran Xu ◽  
Changping Li ◽  
Rendi Kurniawan ◽  
Jielin Chen ◽  
Tae Jo Ko
Keyword(s):  
Surface Roughness ◽  
Titanium Alloy ◽  
Surface Morphology ◽  
Electrical Discharge ◽  
Experimental Studies ◽  
Deionized Water ◽  
Machining Process ◽  
Process Performance ◽  
Micro Hardness ◽  
Discharge Time

Abstract Electrical discharge-assisted milling (EDAM) is an effective method for machining titanium alloys according to previous research. In this study, the influence of three different dielectrics (kerosene, EDM oil, and deionized water) on the EDAM performance was studied. Experimental studies reveal the influence of different dielectrics by analyzing the discharged signal, surface morphology, and elemental composition of the electrode. The results show that kerosene and EDM oil have a higher discharge frequency than deionized water. After a long discharge time, carbides and debris were generated during the machining process, which affected the micro-hardness and the discharge stability of the machined material. In EDAM, EDM oil can produce the best surface quality, and the surface roughness value was 34.93%, 87.92%, and 121.68% higher than that of kerosene, deionized water, and conventional milling (CM), respectively.

Experimental Research on the Surface Roughness Characteristics in Ultrasonic Vibration Lapped Surface of Titanium Alloy

2010 ◽  
Vol 43 ◽  
pp. 420-423
Author(s):  
Lin Zhu ◽  
Ji Yun Li
Keyword(s):  
Surface Roughness ◽  
Grain Size ◽  
Titanium Alloy ◽  
Titanium Alloys ◽  
Ultrasonic Vibration ◽  
Experimental Research ◽  
Reference Value ◽  
Single Factor ◽  
Processing Parameter ◽  
Research Results

Based on the machining principle of ultrasonic vibration lapping, the surface roughness characteristics of plastic difficult-to-machine titanium alloys are studied through experiments using self-developed ultrasonic vibration lapping device. And the effects of workpiece speed, ultrasonic amplitude and grain size on surface roughness were researched by using single-factor testing way. The research results show that surface roughness is decreased to a certain extent for the assistance of ultrasonic vibration. The corresponding results provide certain reference value for the optimization of processing parameter in ultrasonic vibration lapping.

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