scholarly journals Online Measurement of the Elastic Recovery Value of Machined Surface in Milling Titanium Alloy

2021 ◽  
Author(s):  
Panling Huang ◽  
Jun Zhou ◽  
Liang Xu
Keyword(s):  
Titanium Alloy ◽  
Metal Cutting ◽  
Elastic Recovery ◽  
Image Correlation ◽  
Measuring System ◽  
Machined Surface ◽  
Workpiece Surface ◽  
Surface Materials ◽  
Measurement Principle ◽  
Contact Sensor

Abstract In the machining of titanium alloy, the elastic recovery of the machined surface will cause strong friction between the tool flank and the workpiece surface, which will result in the tool wear and the poor machined surface. This paper designed a new online measuring system to monitor the elastic recovery behavior of Ti6Al4V alloy in dry milling based on the digital image correlation (DIC). DIC measurement principle were analyzed and the orthogonal milling experiments were carried out under different cutting conditions. Because of the complexity of metal cutting environment such as high temperature and chip splash, and the micro scale of elastic recovery of metal machined surface materials, DIC non-contact sensor was designed to measure the deformation of machined surface materials in titanium alloy milling. The displacement data obtained from the experiment were analyzed, and the calculation method of the elastic recovery value of the machined surface was obtained. The measured data were compared with those in other literature. The focus of this paper is to explore the availability of DIC measuring instrument for measurement of elastic recovery in titanium alloy milling. This method can be extended to the measurement of machining of other difficult machining materials.

An Analysis on Temperature & Surface Roughness during End Milling of Ti-6Al-4V Alloy

2014 ◽  
Vol 592-594 ◽  
pp. 38-42 ◽  
Author(s):  
S. Samsudeensadham ◽  
Vijayan Krishnaraj
Keyword(s):  
Surface Roughness ◽  
Titanium Alloy ◽  
Metal Cutting ◽  
End Milling ◽  
Cutting Speed ◽  
Critical Issue ◽  
Vital Role ◽  
Effect Of Temperature ◽  
Regression Equations ◽  
Machined Surface

The heat produced in metal cutting process is one of the most critical issue in machining of titanium alloys. High temperature in metal cutting degrades the tool life, surface integrity, size accuracy and machining efficiency dramatically. The temperature generated during end milling of titanium alloy, has been measured using Thermo camera. Surface roughness plays a vital role in evaluating and measuring the quality of the machined surface. During the experiments, cutting speed and feed rate have been changed to analyse the effect of temperature and surface roughness. It is observed that cutting speed has the greater effect on temperature and surface roughness during end milling of titanium alloy. The regression equations generated have better fit which can be used for optimization.

Effect of ultrasonic longitudinal–torsional composite milling of the residual stress on the surface of titanium alloy

2019 ◽  
Vol 234 (8) ◽  
pp. 1598-1608
Author(s):  
Jinglin Tong ◽  
Junshuai Zhao ◽  
Peng Chen ◽  
Zhiming Zhang ◽  
Bo Zhao
Keyword(s):  
Residual Stress ◽  
Titanium Alloy ◽  
Compressive Stress ◽  
Tool Path ◽  
Orthogonal Experiment ◽  
Cutting Speed ◽  
Depth Of Cut ◽  
Machined Surface ◽  
Vibration Direction ◽  
Workpiece Surface

The present study envisages the study of the residual stress characteristics of titanium alloy surface, based on the ultrasonic longitudinal–torsional composite milling process. Initially, the tool path analysis of common milling and ultrasonic longitudinal–torsional composite milling was performed. When compared with the common milling, it was found that the tool–chip cycle separation phenomenon occurred in the torsional vibration direction in the ultrasonic milling tool path. Subsequently, an ultrasonic longitudinal–torsional composite milling experimental platform was built and the effects of the ultrasonic amplitude (A), cutting speed ( vf), axial depth of cut ( ap), and feed per tooth ( fz) on the residual stress of titanium alloy were studied using an orthogonal experiment. The results indicated that the residual stress in ultrasonic longitudinal–torsional composite milling comprised a combination of the “plastic bulge effect” caused by cutting force–cutting heat and the “extrusion effect” of the tool flank on the workpiece. The “extrusion effect” was dominant and presented a compressive stress on the machined surface. The ultrasonic amplitude (A) showed the most significant influence on the residual stress. With an increase of the amplitude, the extrusion and collision effect of the tool on the workpiece surface became more obvious, along with a stronger “extrusion effect” between the tool and the workpiece surface. Experimental results provide a good processing method for the difficult-to-machine materials such as titanium alloy, and offers an effective method for obtaining large surface residual compressive stress.

Grinding Force and Surface Integrity on Dry Belt Grinding of TA15 Titanium Alloys

2009 ◽  
Vol 416 ◽  
pp. 269-273 ◽  
Author(s):  
Wen Guo Huo ◽  
Jiu Hua Xu ◽  
Yu Can Fu
Keyword(s):  
Surface Roughness ◽  
Titanium Alloy ◽  
High Surface ◽  
Surface Hardness ◽  
Ground Surface ◽  
Grinding Force ◽  
Belt Grinding ◽  
Machined Surface ◽  
Workpiece Surface ◽  
Dry Grinding

This paper was dedicated to elucidate an investigation of grinding force and workpiece surface of Titanium alloy TA15 in dry grinding by using zirconia alumina belts. The grinding forces were measured by KISTLER 9265B dynamometer. Machined surface morphology and the metallographic structure were observed using 3D viewer microscope. Surface roughness was measured using Mahr Perthometer M1 instrument. The surface microhardness for ground surface was detected by HVS-1000 instrument. The good results were obtained, as follows: low surface roughness, high surface hardness, no microstructural damage, in the form cracks or recrystallisation of the grinding surface, the stable grinding performance with zirconia alumina belts, the small plastic deformation depth of workpiece surface (≤5μm). Therefore belt grinding showed excellent performance during grinding titanium alloy.

Optimization of Cutting Parameters and Burrs Control with PMMA Coating in Micro-Milling Titanium Alloys

2016 ◽  
Vol 836-837 ◽  
pp. 191-197 ◽  
Author(s):  
Yu Chao Li ◽  
Zhan Qiang Liu ◽  
Yu Kui Cai ◽  
Zhao Jun Kou
Keyword(s):  
Titanium Alloy ◽  
Cutting Parameters ◽  
Optical Microscope ◽  
Machining Process ◽  
Micro Milling ◽  
Depth Of Cut ◽  
Machined Surface ◽  
Workpiece Surface ◽  
Coating Method ◽  
Optimization Of Cutting Parameters

Fabrication of microchannels on titanium alloy with micro-milling is a tough challenge due to the difficultly to remove the burrs formed in machining process. A novel method to gelatinize workpiece surface to control the generation of burr as well as the optimization of cutting parameters are investigated in this paper. Differences existed between the process of micro-milling and that of traditional milling can be accounted for size effect. Influences of feed per tooth, depth of cut and spindle speed on the formation of burr were taken into consideration respectively by single factor method. The topographies of the machined surface with micro-milling were observed and measured by optical microscope. Results showed that the dimensions of burrs increased with the rise of depth of cut. However, it decreased initially, then increased later with the augment of feed per tooth. Sacrifice layer with PMMA was coated and gelatinized on the workpiece surface, which could restrain the plastic deformation of materials during titanium alloy micro-milling. The experimental results presented that the dimensions of burr could reduce greatly by the proposed PMMA coating method compared to materials without coating.

scholarly journals Influence of turning tool wear on the surface integrity and anti-fatigue behavior of Ti1023

2021 ◽  
Vol 13 (4) ◽  
pp. 168781402110112
Author(s):  
Li Xun ◽  
Wang Ziming ◽  
Yang Shenliang ◽  
Guo Zhiyuan ◽  
Zhou Yongxin ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Plastic Deformation ◽  
Titanium Alloy ◽  
Fatigue Life ◽  
Tool Wear ◽  
Surface Integrity ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Machined Surface ◽  
Deformation Layer

Titanium alloy Ti1023 is a typical difficult-to-cut material. Tool wear is easy to occur in machining Ti1023, which has a significant negative effect on surface integrity. Turning is one of the common methods to machine Ti1023 parts and machined surface integrity has a direct influence on the fatigue life of parts. To control surface integrity and improve anti-fatigue behavior of Ti1023 parts, it has an important significance to study the influence of tool wear on the surface integrity and fatigue life of Ti1023 in turning. Therefore, the effect of tool wear on the surface roughness, microhardness, residual stress, and plastic deformation layer of Ti1023 workpieces by turning and low-cycle fatigue tests were studied. Meanwhile, the influence mechanism of surface integrity on anti-fatigue behavior also was analyzed. The experimental results show that the change of surface roughness caused by worn tools has the most influence on anti-fatigue behavior when the tool wear VB is from 0.05 to 0.25 mm. On the other hand, the plastic deformation layer on the machined surface could properly improve the anti-fatigue behavior of specimens that were proved in the experiments. However, the higher surface roughness and significant surface defects on surface machined utilizing the worn tool with VB = 0.30 mm, which leads the anti-fatigue behavior of specimens to decrease sharply. Therefore, to ensure the anti-fatigue behavior of parts, the value of turning tool wear VB must be rigorously controlled under 0.30 mm during finishing machining of titanium alloy Ti1023.

Research on Embedded Roundness Measuring System

2012 ◽  
Vol 184-185 ◽  
pp. 1613-1617
Author(s):  
Jin Fang Zhu
Keyword(s):  
Data Collection ◽  
Power Consumption ◽  
Low Power ◽  
High Accuracy ◽  
Measuring System ◽  
Low Power Consumption ◽  
Measurement Principle ◽  
Graphic Construction ◽  
Collection Date ◽  
Roundness Measurement

This article studies the embedded SPC and its application in roundness measuring system by analyzing the current roundness measurement principle and technology. With analyzing the process of data collection, date treatment and various kinds of tool graphic construction, we study the feasibility of integrating SPC into roundness measurement and finally apply the embedded SPC as pure software into roundness measuring system. We design the roundness measuring system based on embedded SPC and develop the roundness measuring system of low power consumption, high accuracy and easy application, which is suitable for industry field usage.

scholarly journals Machined Surface Topography Investigation in Turning of Titanium Alloy (Ti-6al-4v) Using Steam as A Coolant

2015 ◽  
Vol 12 (2) ◽  
pp. 104-107
Author(s):  
Afaqahmed Jamadar ◽  
Vilas Shinde ◽  
Muhammedumar Jamadar ◽  
Javed Kazi
Keyword(s):  
Titanium Alloy ◽  
Surface Topography ◽  
Machined Surface

scholarly journals Studying of Cutting Zone When Finishing Titanium Alloy by Application of Multifunction Measuring System

2013 ◽  
Vol 13 (4) ◽  
pp. 428-431 ◽  
Author(s):  
Andrej Czán ◽  
Michal Sajgalík ◽  
Jozef Holubjak ◽  
Karel Kouril
Keyword(s):  
Titanium Alloy ◽  
Measuring System ◽  
Cutting Zone

scholarly journals Flow Field Simulation And Experimental Investigation On Macro Electrolyte Jet Electrochemical Turning of TB6 Titanium Alloy

2021 ◽  
Author(s):  
Yang Liu ◽  
Ningsong Qu ◽  
Zhi Qiu
Keyword(s):  
Titanium Alloy ◽  
Flow Field ◽  
Contour Error ◽  
Tool Electrode ◽  
Machined Surface ◽  
Tb6 Titanium Alloy ◽  
Machined Surface Roughness ◽  
Application Potential ◽  
Electrochemical Turning ◽  
Electrolyte Jet

Abstract Electrolyte jet electrochemical turning is an effective method to realize high-quality machining of titanium alloy rotating components; however, minimal research has been carried out in this field. This is because it is difficult to control the machining flow field, which leads to poor machining surface quality. In this work, numerical simulations were used to optimize the machining flow field and reduce the proportion of gas that mixed into the machining area. This can promote participation of the tool electrode tip in the electrochemical reaction and improve the machining efficiency. The effectiveness of the optimized machining flow field for jet electrochemical turning was verified experimentally. The results showed that all three kinds of revolving TB6 titanium alloy samples with different structures could maintain the original contour shape, with a contour error <1% and a machined surface roughness reaching Ra 2.414 μm. The results demonstrate the application potential of the jet electrochemical turning process.

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