scholarly journals Hybrid Composite-Metal Stack Drilling with Different Minimum Quantity Lubrication Levels

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 448 ◽  
Author(s):  
J. Fernández-Pérez ◽  
J. Cantero ◽  
J. Díaz-Álvarez ◽  
M. Miguélez
Keyword(s):  
Dissimilar Materials ◽  
Minimum Quantity Lubrication ◽  
Cutting Edge ◽  
Added Value ◽  
Softening Effect ◽  
Minimum Quantity ◽  
Reinforced Plastics ◽  
Common Operation ◽  
Coated Carbide

Hybrid stack drilling is a very common operation used in the assembly of high-added-value components, which combines the use of composite materials and metallic alloys. This process entails the complexity of machining very dissimilar materials, simultaneously, on account of the interactions that are produced between them, during machining. This study analyzed the influence of Minimum Quantity Lubrication (MQL) on the performance of diamond-coated carbide tools when drilling Ti/carbon fiber reinforced plastics (CFRP)/Ti stacks. The main wear mechanism observed was diamond-coating detachment, followed by fragile breaks in the main cutting-edge. The tests done with the lower lubrication levels have shown an important adhesion of titanium (mainly on the secondary cutting-edge) and a higher friction between the tool and the workpiece, producing higher temperatures on the cutting region and a thermal softening effect on the workpiece. These phenomena affect the evolution of cutting power consumption with tool wear in the titanium layer. Regarding the quality of the test specimen, no significant differences were observed between the lubrication levels tested.

scholarly journals Performance of Al2O3 nanofluids in minimum quantity lubrication in hard milling of 60Si2Mn steel using cemented carbide tools

2017 ◽  
Vol 9 (7) ◽  
pp. 168781401771061 ◽  
Author(s):  
Duc Tran Minh ◽  
Long Tran The ◽  
Ngoc Tran Bao
Keyword(s):  
Surface Roughness ◽  
Tool Life ◽  
Minimum Quantity Lubrication ◽  
High Hardness ◽  
Cemented Carbide ◽  
Cutting Fluid ◽  
Hard Milling ◽  
Minimum Quantity ◽  
Coated Carbide ◽  
Lubrication Conditions

In this article, an attempt has been made to explore the potential performance of Al2O3 nanoparticle–based cutting fluid in hard milling of hardened 60Si2Mn steel (50-52 HRC) under different minimum quantity lubrication conditions. The comparison of hard milling under minimum quantity lubrication conditions is done between pure cutting fluids and nanofluids (in terms of surface roughness, cutting force, tool wear, and tool life). Hard milling under minimum quantity lubrication conditions with nanofluid Al2O3 of 0.5% volume has shown superior results. The improvement in tool life almost 177%–230% (depending on the type of nanofluid) and the reduction in surface roughness and cutting forces almost 35%–60% have been observed under minimum quantity lubrication with Al2O3 nanofluids due to better tribological behavior as well as cooling and lubricating effects. The most outstanding result is that the uncoated cemented carbide insert can be effectively used in machining high-hardness steels (>50 HRC) while maintaining long tool life and good surface integrity (Ra = 0.08–0.35 µm; Rz = 0.5–2.0 µm, equivalent to finish grinding) rather than using the costlier tools like coated carbide, ceramic, and (P)CBN. Therefore, using hard nanoparticle–reinforced cutting fluid under minimum quantity lubrication conditions in practical manufacturing becomes very promising.

scholarly journals Performance of TiAlN PVD coated carbide tool in machining AISI 4340 with Minimum Quantity Lubrication (MQL) condition

2021 ◽  
Vol 1034 (1) ◽  
pp. 012099
Author(s):  
Mahros Darsin ◽  
Rika Dwi Hidayatul Qoryah ◽  
Robertus Sidartawan ◽  
Allen Luviandy ◽  
Aris Zainul Muttaqin ◽  
...  
Keyword(s):  
Minimum Quantity Lubrication ◽  
Carbide Tool ◽  
Minimum Quantity ◽  
Coated Carbide Tool ◽  
Coated Carbide ◽  
Aisi 4340

Application of Minimum Quantity Lubrication when Drilling Nickel-Based Superalloy at High Cutting Speed

2009 ◽  
Vol 407-408 ◽  
pp. 612-615 ◽  
Author(s):  
Erween Abdul Rahim ◽  
Hiroyuki Sasahara
Keyword(s):  
Feed Rate ◽  
High Speed ◽  
Failure Modes ◽  
Cutting Temperature ◽  
Cutting Speed ◽  
Weight Ratio ◽  
Minimum Quantity Lubrication ◽  
Machined Surface ◽  
Minimum Quantity ◽  
Coated Carbide

Nowadays, an increase on demands of aerospace components has led to implementation of high speed machining (HSM). The principal factors in the performance of aerospace materials are strength-to-weight ratio, fatigue life, fracture toughness, survivability and of course, reliability. However, when HSM is coupled with dry or near dry machining, it will present considerable technical challenges to the manufacturing sector especially when the integrity of the machined surface is concerned. In this investigation, the effect of high speed drilling (HSD) conditions on the performance and surface integrity of Inconel 718 were studied. Hole was drilled individually using TiAlN coated carbide insert drill (14 mm in diameter) under minimum quantity of lubrication (MQL) condition. Results showed that uniform flank wear and chipping were the dominant tool failure modes. Moreover, the results showed an increase in cutting temperature with increasing cutting speed and feed rate. Thrust force and torque decreased linearly with the increasing cutting speed but significantly increased when higher feed rate is employed. Cutting speed significantly influenced the distribution of surface roughness value. Variations of hardness readings were recorded beneath the machined surfaces, they were due to the hardening effects caused by concentration of high temperature and stresses on the workpiece.

Sign in / Sign up

Export Citation Format

Share Document