An investigation on the influence of cutting speed and thermal softening in micro-cutting of single crystal

2021 ◽  
Vol 44 (1) ◽  
Author(s):  
Murat Demiral ◽  
Fethi Abbassi ◽  
Rajesh Khatirkar
Keyword(s):  
Single Crystal ◽  
Cutting Speed ◽  
Thermal Softening ◽  
Micro Cutting

Investigating Microstructural Changes and Phase Transformation During Slot Milling of Ti-6Al-4V in Dry, Flood Coolant and MQL Conditions

2019 ◽  
Author(s):  
Ashutosh Khatri ◽  
Muhammad P. Jahan ◽  
Xingbang Chen ◽  
Jianfeng Ma
Keyword(s):  
Phase Transformation ◽  
Cutting Speed ◽  
Thermal Softening ◽  
Phase Changes ◽  
Depth Of Cut ◽  
Dry Machining ◽  
Machined Surface ◽  
Microstructural Changes ◽  
Slot Milling ◽  
Β Phase

Abstract The objective of this study is to investigate the microstructural changes and phase transformation of chips and workpiece during slot milling on Ti-6Al-4V alloy in dry, flood coolant, and MQL conditions using uncoated carbide tools. The experiments were performed at varying feed rate and depth of cut with a fixed cutting speed of 50 m/min. The microstructures of the machined chips indicate that dry machining had the highest percentage of β-phase indicating higher phase transformation owing to higher tool temperature. The β-phase was found to be the least in MQL machining chips, which is very similar to the microstructural composition of un-machined surface. Although there were signs of phase transformation, there were very minimal changes in phases in the workpiece for all three machining conditions. In many cases, no change or slight decrease in β-phase was observed at the sub-surface, indicating thermal softening of the workpiece, especially in dry machining. The findings from this study confirm the fact that, high temperature close to beta transition temperature is generated during dry machining of titanium alloy, and most of heat is carried away by the chips resulting in phase transformation from alpha to beta phase in chips. However, no significant phase changes occurred into the microstructure of the workpiece in any condition, although minor thermal softening was found at the sub-surface of dry machined workpiece.

MODELING OF THE GRINDING PROCESS BY MICRO-CUTTING SINGLE ABRASIVE GRAINS. PART 3. FORMATION OF RIS-GROOVES

2021 ◽  
pp. 10-14
Author(s):  
Yu. M. Zubarev ◽  
A. V. Priemyshev
Keyword(s):  
Cutting Speed ◽  
Physical And Mechanical Properties ◽  
Metal Quality ◽  
Micro Cutting ◽  
Abrasive Grains ◽  
Wide Range ◽  
Machine Parts ◽  
Positive Effect ◽  
Cutting Speeds

When grinding on the processed surface of the workpieces of machine parts, a set of RIS-grooves is formed from the action of the vertices of the cutting abrasive grains of the circle. These risks mainly determine the roughness parameters of the treated surface and its physical and mechanical properties. The article presents the results of research of the micro-cutting process of different steels with different abrasive grains in a wide range of cutting speeds. It is shown that increasing the cutting speed during grinding has a positive effect on improving the metal quality of the surface layer of parts.

Electric Discharge Machining for Silicon Carbide in Gases of Ar, Ar-CH4 and Ar-CF4 Mixtures

2010 ◽  
Vol 645-648 ◽  
pp. 869-872 ◽  
Author(s):  
Tatsunori Sugimoto ◽  
Toshiya Noro ◽  
Satarou Yamaguchi ◽  
Hideyoshi Majima ◽  
Tomohisa Kato
Keyword(s):  
Silicon Carbide ◽  
Single Crystal ◽  
Electric Discharge ◽  
Cutting Speed ◽  
Electric Discharge Machining ◽  
Smooth Edge ◽  
Discharge Gas

We report on the discharge gas of the electric discharge machining (EDM) for silicon carbide (SiC) single crystal. We investigated the cutting speed and the kerf loss of EDM for SiC by using three kinds discharge gases: Ar, Ar+CH4(10%) and Ar+CF4(10%). The maximum cutting speed of EDM in Ar, Ar+CH4(10%) and Ar+CF4(10%) was 0.02mm/min, 0.04 mm/min and 0.06 mm/min, respectively. The kerf loss of EDM in Ar, Ar+CH4(10%) and Ar+CF4(10%) was 490m, 430m and 470m, respectively. It is shown that cutting with a smooth edge and low kerf loss is faster by mixing CH4 or CF4 in Ar.

A Study of Exit-Burr Formation Mechanism Using the Finite Element Method in Micro-Cutting of Aluminum Alloy

2008 ◽  
Vol 375-376 ◽  
pp. 470-473 ◽  
Author(s):  
Dong Lu ◽  
Jian Feng Li ◽  
Yi Ming Rong ◽  
Jie Sun ◽  
Jun Zhou ◽  
...  
Keyword(s):  
Cutting Speed ◽  
Chip Thickness ◽  
Burr Formation ◽  
Uncut Chip Thickness ◽  
Micro Cutting ◽  
Tool Edge Radius ◽  
Edge Radius ◽  
Tool Edge ◽  
Speed Effect ◽  
Exit Burr

A burr formation process in micro-cutting of Al7075-T7451 was analyzed. Three stages of burr formation including steady-state cutting stage, pivoting stage, and burr formation stage are investigated. And the effects of uncut chip thickness, cutting speed and tool edge radius on the burr formation are studied. The simulation results show that the generation of negative shear zone is one of the prime reasons for burr formation. Uncut chip thickness has a significant effect on burr height; however, the cutting speed effect is minor. Unlike in conventional cutting, in micro-cutting the effect of tool edge radius on the burr geometry can no longer be neglected.

Experimental Study on Microhardness and Microstructure for 7050-T7451 Aluminum Alloy of High Speed Milling

2013 ◽  
Vol 401-403 ◽  
pp. 783-786 ◽  
Author(s):  
Zhao Lin Zhong ◽  
Xing Ai
Keyword(s):  
Experimental Study ◽  
Aluminum Alloy ◽  
Service Life ◽  
High Speed ◽  
Cutting Speed ◽  
Thermal Softening ◽  
High Speed Milling ◽  
Microhardness And Microstructure ◽  
Surface Performance

Determination of the surface integrity is of particular importance because of its influence on workpiece service life. The microstructure of 7050-T7451 aluminum alloy under the cutting speed of 3000~5000m/min was observed in this paper. With the increase of cutting speed, microhardness was analyzed to investigate the thermal softening phenomenon engendered, which would affect the surface performance in return. According to the results, influences of cutting speed on microstruceture and microhardness in high speed were explored and further research on temperature in high speed is suggested.

Experimental Investigation on Precision Cutting Ti6Al4V Alloy Using Single Crystal Diamond Tools

2014 ◽  
Vol 633-634 ◽  
pp. 832-835
Author(s):  
Lin Hua Hu ◽  
Ming Zhou
Keyword(s):  
Surface Roughness ◽  
Single Crystal ◽  
Cutting Speed ◽  
Cutting Parameters ◽  
Limited Range ◽  
Machined Surface ◽  
Diamond Tools ◽  
Single Crystal Diamond ◽  
Machined Surface Roughness ◽  
Titanium Alloy Ti6al4v

In this work, cutting experiments were carried out on titanium alloy Ti6Al4V by using single crystal diamond tools to investigate the effects of cutting parameters on machined surface roughness. Experimental results show machined surface roughness decreases with increases in the cutting speed within a limited range, begins to increase as the factors reaches to certain values respectively, and decreases with increases in feed rate. Cutting depth has no significant influence on the machined surface roughness. The results also show that dominant mechanisms of the single crystal diamond tools are abrasive wear and adhesion wear.

MODELING OF THE GRINDING PROCESS BY MICRO-CUTTING SINGLE ABRASIVE GRAINS. PART 1. DETERMINATION OF THE STRENGTH OF ABRASIVE GRAINS

2020 ◽  
pp. 13-17
Author(s):  
Yu. M. Zubarev ◽  
A. V. Priemyshev
Keyword(s):  
Cutting Speed ◽  
Tool Material ◽  
Physical And Mechanical Properties ◽  
Workpiece Material ◽  
Micro Cutting ◽  
Abrasive Grains ◽  
Maximum Cut ◽  
Wide Range ◽  
Cutting Speeds

Main performance indicators of grinding wheels are the strength and wear resistance of abrasive grains. The description of the installation for studying the process of micro-cutting of various materials with single abrasive grains, which allows you to approximate the working conditions of a single abrasive grain to the conditions of real grinding in a wide range of cutting speeds. The effect of the cutting speed on the maximum cut thickness maintained by the grain vertexes without their destruction is shown. The influence of physical and mechanical properties of the workpiece material and the abrasive tool material, together with technological factors, on the micro-cutting process is considered.

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