scholarly journals Evaluation of Workpiece Surface Integrity Following Point Grinding of Advanced Titanium and Nickel Based Alloys

Procedia CIRP ◽  
2016 ◽  
Vol 45 ◽  
pp. 47-50 ◽  
Author(s):  
D.T. Curtis ◽  
S.L. Soo ◽  
D.K. Aspinwall ◽  
A.L. Mantle
Keyword(s):  
Surface Integrity ◽  
Workpiece Surface

Workpiece surface integrity considerations when finish turning gamma titanium aluminide

Wear ◽  
2001 ◽  
Vol 249 (5-6) ◽  
pp. 473-481 ◽  
Author(s):  
A.R.C. Sharman ◽  
D.K. Aspinwall ◽  
R.C. Dewes ◽  
P. Bowen
Keyword(s):  
Surface Integrity ◽  
Titanium Aluminide ◽  
Gamma Titanium Aluminide ◽  
Workpiece Surface ◽  
Finish Turning ◽  
Gamma Titanium

Analysis of the Surface Integrity Machined by Short Electric Arc Machining

2011 ◽  
Vol 462-463 ◽  
pp. 1068-1074 ◽  
Author(s):  
Jian Ping Zhou ◽  
Mamtimin Gheni ◽  
Chu Hua Liang ◽  
Yan Xu ◽  
Bi Sheng Zhou
Keyword(s):  
Surface Integrity ◽  
Orthogonal Experiment ◽  
Water Pressure ◽  
Influence Factors ◽  
Surface Hardness ◽  
Air Pressure ◽  
Workpiece Surface ◽  
Pressure Gap ◽  
Relative Line ◽  
Electrode Discharge

In order to research the surface integrity of SEAM, the surface figure, surface heat-affected zones (HAZ ) and surface hardness are analyzed. The author mainly researches the influence factors of water pressure, air pressure, cathode feed rate and relative line speed on processing indictor. The orthogonal experiment results indicate that the main influence factors of surface roughness and HAZ are air pressure, gap voltage and cutting depth. In SEAM, certain scope pressure atomization of dielectric liquid has deionization and arc-extinguishing effect, and takes away melted metal and heat from the discharge channel in time. Workpiece surface will be smoothness. However, the enlarged air pressure will break normal electrode discharge and make the surface smoothness worse. The research of influence of gap voltage on surface quality are accomplished.

Detecting the key geometrical features and grades of carbide inserts for the turning of nickel-based alloys concerning surface integrity

2016 ◽  
Vol 230 (20) ◽  
pp. 3725-3742 ◽  
Author(s):  
A Fernández-Valdivielso ◽  
LN López de Lacalle ◽  
G Urbikain ◽  
A Rodriguez
Keyword(s):  
Surface Integrity ◽  
Inconel 718 ◽  
Cutting Tools ◽  
Cutting Speed ◽  
Rake Angle ◽  
Point Of View ◽  
Basic Operation ◽  
Workpiece Surface ◽  
Common Features ◽  
Feasible Solutions

Machining science is aimed at defining both cutting tools and machining conditions based on economic performance and to maintain workpiece surface integrity. Currently, machinists face a wide offer of turning, milling, drilling, and threading tools. Tools present a lot of similarities and light differences between them, being the latter the concealed reasons for a better or worse performance on difficult-to-cut alloys machining. However machinists had not useful methods for detecting which key tool aspects implies the best performance. The classic and expensive 'test-trial' method results non-viable due to the market exponential increase, both in size and specialization. This paper brings up an indirect method for seeking common features in the group of those tools with the best performance on machining Inconel 718. The method is divided into five stages, namely: (a) raw testing of a basic operation with a lot of commercial solutions for the same operation; (b) filtering of results to reduce the feasible solutions to a few ones, studying the common features of successful cases; (c) testing of these feasible solutions aimed at choosing the best insert or tool (d); and finally (e) full testing concerning all workpiece surface integrity issues. The proposed method provides knowledge based on the distilling of results, identifying carbide grades, chipbreakers shapes, and other features for having the best tool performance. All surface integrity effects are checked for the best solution. This new point of view is the only way for improving the difficult-to-cut alloys machining, reaching technical conclusions with industrial interest. This paper shows the method applied on Inconel 718 turning, resulting in a carbide grade with 10% cobalt, submicron grain size (0.5–0.8 µm) and hardness around 1760 HV, coating TiAlN monolayer with 3.5 µm thickness, chipbreaker giving 19° of rake angle that becomes 13° real one after insert is clamped on toolholder. Cutting edge radius after coating was 48 µm approximately. Cutting speed was 70 m/min higher in comparison with that recommended in handbooks.

Investigation of Grinding Fluid Supply Parameters on Workpiece Surface Integrity

2014 ◽  
Vol 1017 ◽  
pp. 458-463
Author(s):  
Shi Chao Xiu ◽  
Xiu Ming Zhang ◽  
Ang Jiang ◽  
Xiao Liang Shi ◽  
Shu Jun Li ◽  
...  
Keyword(s):  
Surface Integrity ◽  
Flow Model ◽  
Fluid Distribution ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Two Phase ◽  
Workpiece Surface ◽  
Grinding Fluid ◽  
Parameters Selection ◽  
Fluid Supply

The grinding heat directly affected workpiece surface in the grinding process and it might produce some defects such as crack and burn. Meanwhile wear debris generated in the grinding process could easily embed grinding wheel blowhole and caused clogging and passivation. So it was particular important to avoid defects and improve the grinding workpiece surface integrity effectively. This paper established an incompressible turbulent fluid spray model based on the study of the existing airflow and the grinding fluid distribution in the grinding zone. Then according to different grinding fluid supply parameters established the two-phase gas liquid spray flow model by using CFD(computational fluid dynamics), simulated and calculated the model, compared the mass flow rate of the grinding fluid flow field with different spray distances, heights, speeds and spray angles in the grinding zone and determined the most reasonable spraying jet position. At the last, through researching on the workpiece surface integrity experiment, it provided an experimental basis to determine the most suitable spray jet position and verify the rationality of supply parameters selection.

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