A comparison between wet and cryogenic drilling of CFRP/Ti stacks

Impero, Filomena; Dix, Martin; Squillace, Antonino; Prisco, Umberto; Palumbo, Biagio; Tagliaferri, Flaviana

doi:10.1080/10426914.2018.1453162

Cited by 60 publications

(11 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…They also suggested that the positioning of cryogenic nozzle influences the cutting forces during machining. Impero et al 12 performed the deep hole drilling on CFRP/Ti stacks and found that drilling using cryogenic coolant is more stable when compared to other drilling methods. They also identified that the usage of cryogenic coolant helps in embrittlement of chips which makes it easier for removal for the stack drilling.…”

Section: Introductionmentioning

confidence: 99%

High speed cryogenic drilling of Ti-6Al-4V alloy under high pressure coolant conditions

Chealvan

Krishnaraj

Rahim

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

Titanium alloy (Ti-6Al-4V) plays a major role in aerospace and biomedical applications. Titanium alloys are drilled extensively to fabricate most of the aerospace structures. Ti alloys are having low thermal conductivity and are classified as difficult to cut material due to their high strength and adhesion toward the tool material. As a result, Ti alloys demand the use of coolant for drilling operations. Cryogenic is one of the most suitable methods of cooling as handling and disposal is easier compared to the wet and minimum quantity lubrication (MQL) methods. This paper deals with the high-speed drilling of Ti-6Al-4V alloy by the application of high-pressure cryogenic coolant at 22 bar. The results shows that there is a significant reduction in the thrust force ( FZ), torque ( MZ), and temperature ( T) and the effect of feed is negligible on circularity, cylindricity, and surface roughness of the holes when drilled at high speeds. The high pressure of the coolant helps in better penetration into the tool-chip interface and acts as an effective lubricant. This helps in reducing the friction between the tool and workpiece resulting in improved hole quality. These results are then compared with dry drilling of Ti-6Al-4V under same experimental conditions.

show abstract

Section: Introductionmentioning

confidence: 99%

High speed cryogenic drilling of Ti-6Al-4V alloy under high pressure coolant conditions

Chealvan

Krishnaraj

Rahim

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

show abstract

“…In addition to these damages mentioned above, heat resistance of the polymer matrix is also limited; thus, thermal damages and deterioration of the composite structure may occur due to the generation of heat during machining. However, mechanical properties and dimensional accuracy of the CFRP components may be affected by using conventional coolants [ 15 , 16 , 17 , 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Deformation Resistance Performance of Carbon Fiber-Reinforced Plastic Machined by Controlling Drilling Area Temperature below the Glass Transition Temperature

Zhang

Duan

et al. 2021

Materials

View full text Add to dashboard Cite

Drilling of carbon fiber-reinforced plastics (CFRPs) is a challenging task in aviation and aerospace field. Damages, which can reduce the strength of the structure, often occur during secondary machining operations due to the applied cutting force and generated heat. The main objective of this study was to investigate the drilling performance and the deformation resistance of CFRPs subjected to cryogenic treatment based on glass transition temperature (Tg). Therefore, a cryogenic machining approach was adopted by fixing the workpiece inside a cryogenic box to drill CFRPs. The machining performance was briefly evaluated. Moreover, a through-hole drilling method was promoted to analyze the mechanism of different deformation mechanical properties. The results showed that the cryogenic machining approach improved the machining performance of CFRPs. Nevertheless, the residual intensity of cryo-treated specimen decreased (about 7.14%) due to the Tg-based viscoelasticity. These results demonstrate the great potential of this approach in advanced industrial applications and further pave the way for efficient secondary machining operation of CFRP components.

show abstract

“…To maximize the productivity during the aircraft final assembly, it is required to develop one-shot drilling techniques where holes for joining both CFRP and Ti plates by mechanical fasteners are drilled simultaneously using the same drill tool and often, different machining parameters for the respective layers. However, the abrasive nature of carbon fibers in CFRP and high toughness of Ti are at a dichotomy, which makes CFRP/Ti stack drilling a difficult and important topic for the aerospace industry [2][3][4][5][6][7][8]. From the perspectives of cost, productivity, hole quality, and consistency, improvements to the current performance of cutting tools and hybrid CFRP material systems are beneficial to the aerospace manufacturing industry [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

A study on the machinability of advanced arc PVD AlCrN-coated tungsten carbide tools in drilling of CFRP/titanium alloy stacks

Kim

Swan

He³

et al. 2020

Carbon Lett.

View full text Add to dashboard Cite

This study aims to investigate the effect of an aluminum chromium nitride (AlCrN) coating on tool wear and hole quality in the conventional drilling process of carbon fiber-reinforced plastic (CFRP) composites, titanium alloy (Ti), and CFRP-Ti stack workpieces popular in the aerospace industry. The advanced arc plasma acceleration (APA) method of physical vapor deposition (PVD) was used for all AlCrN coatings. The drilling experiments were conducted with uncoated drills as well as AlCrN-coated drills. When drilling CFRP only, the AlCrN coating was removed at the drill cutting edges and the margin area, which suggests the carbon fibers abraded the coatings. When drilling Ti only, the AlCrN-coated drill mitigated the Ti adhesion formation, which resulted in less tool wear. In addition, hole quality for both CFRP and Ti was improved when the coating was used versus the uncoated tool. The machinability of CFRP-Ti stacks in the drilling process was improved by utilizing the advanced AlCrN coating on the WC tool in terms of drilling forces and hole quality parameters such as average hole size, average hole roundness, hole surface roughness, and Ti exit burr height.

show abstract

A comparison between wet and cryogenic drilling of CFRP/Ti stacks

Cited by 60 publications

References 20 publications

High speed cryogenic drilling of Ti-6Al-4V alloy under high pressure coolant conditions

High speed cryogenic drilling of Ti-6Al-4V alloy under high pressure coolant conditions

Deformation Resistance Performance of Carbon Fiber-Reinforced Plastic Machined by Controlling Drilling Area Temperature below the Glass Transition Temperature

A study on the machinability of advanced arc PVD AlCrN-coated tungsten carbide tools in drilling of CFRP/titanium alloy stacks

Contact Info

Product

Resources

About