Experimental Investigation of Clamping Systems and the Resulting Change of Cutting Conditions While Drilling Carbon Fiber Reinforced Plastics

Klotz, Stefan; Lepold, Andreas; Zanger, Frederik; Schulze, Volker

doi:10.1016/j.procir.2016.06.089

Cited by 9 publications

(7 citation statements)

References 20 publications

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“…They specified that drilling with small double point angle is successful in minimizing the thrust force and delamination, but the geometry reduced the hole quality caused by the uncut fibers on the surface of holes. Klotz et al [22] considered the influences of clamping system in respect of the bending moment and axial force in drilling of CFRP. The authors specified that the feed per tooth is variable until the chisel edge of drill exits from the workpiece, and thus, the deflection of the workpiece decreases together with the decreasing the feed rate at the end of the hole.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on novel drilling strategy of CFRP laminates using variable feed rate

Yaşar

Günay

2019

J Braz. Soc. Mech. Sci. Eng.

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This study focused on the influences of drilling parameters on hole quality and thrust force in drilling of carbon fiberreinforced polymer (CFRP) composite laminates via variable feed rate. Drilling experiments were carried out by using three different cutting speeds, feed rates and the qualities of tungsten carbide drill. Scanning electron microscopy and coordinate measurement machine were used for hole surface damage and diameter analyses, and also a portable instrument and 3D optical profilometer were utilized for surface roughness measurement. It was identified that thrust force (F z), delamination factor (F d) and average surface roughness (R a) values attained in drilling processes by variable feed rate are lower than those of constant feed rate with average of 14%, 3% and 18%, respectively. Besides, the hole diameter (D) values obtained with variable feed rate in hole exit were higher than those of constant feed rate. Moreover, the higher F z values were obtained with diamond-coated and TiAlN-coated drills than those of uncoated drill with 55% and 77%, respectively. The interactive influences of drilling parameters on machinability factors were evaluated via analysis of variance, and then, the most significant parameter was specified as the feed rate for F d , just as the drill quality for F z , R a and D. According to the experimental and statistical results, we suggested that the novel drilling strategy is a significant alternative for the step hole and conventional drilling of CFRP laminates.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation on novel drilling strategy of CFRP laminates using variable feed rate

Yaşar

Günay

2019

J Braz. Soc. Mech. Sci. Eng.

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“…It can be seen that a significant amount of material, which is squeezed between the composite parts, creates a significant gap between the parts. Moreover, further separation of the composite parts is expected due to the surface delamination evidenced by the fiber peel-up and push-out effects (highlighted by dashed-line squares in Figure 7 , a commonly reported phenomenon in the drilling of composites [ 10 , 11 ]. As reported by Matsuzaki et al [ 38 ], this lack of joint sealing can compromise the corrosion behavior and loading capacity of bolted composite joints by creating eccentricities.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 2 a show the clamping system, while Figure 2 b highlights the dimensions of the upper clamping element. A circular fixation diameter of 16 mm was selected to homogeneously distribute the clamping force and reduce the superficial damages of the composite (according to common practices for drilling procedures of fiber reinforced polymers [ 10 ]). The selected joining conditions used in this work are listed in Table 3 .…”

Section: Methodsmentioning

confidence: 99%

“…The optimization of such post-processing is, therefore, critical for providing a high quality of components and structures, high productivity, and reproducibility. A typical variable in machining, welding, and joining is the clamping system, which has been reported as a relevant factor to avoid any undesirable distortion and defects and hence a loss of structural integrity [ 10 , 11 , 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

“…The influence of clamping on machining processes is relatively well understood for several materials [ 15 , 16 , 17 , 18 ] including fiber-reinforced polymers [ 10 , 11 , 19 ]. Klotz et al [ 11 ] investigated the influence of the clamping system during the drilling of carbon-fiber-reinforced plastics.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Clamping Pressure on Joint Formation and Mechanical Performance of Ti6Al4V/CF-PEEK Friction-Riveted Joints

2019

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This work aims at investigating the influence of pre-set clamping pressure on the joint formation and mechanical strength of overlapping direct-friction-riveted joints. A pneumatic fixture device was developed for this work, with clamping pressure varying from 0.2 MPa to 0.6 MPa. A case study on overlapping joints using Ti6Al4V rivets and woven carbon fiber-reinforced polyether-ether-ketone (CF-PEEK) parts were produced. Digital image correlation and microscopy revealed the expected compressive behavior of the clamping system and the continuous pressure release upon the joining process owing to the rivet plastic deformation and the polymer squeezing flow. Two preferential paths of material flow were identified through the alternate replacement of the upper and lower composite parts by a poly-methyl-methacrylate (PMMA) plate—the composite upward and squeezing flow between the parts which induced their separation. The ultimate lap shear forces up to 6580 ± 383 N were achieved for the direct-friction-riveted CF-PEEK overlap joints. The formation of a gap to accommodate squeezed polymer between the composite parts during the process had no influence on the joint mechanical performance. The increase in the clamping pressure for joints produced with a low friction force did not affect the joint-anchoring efficiency and consequently the joint strength. On the other hand, the combined effect of a high-friction force and clamping pressure induced the inverted bell shape of the plastically deformed rivet tip, a lower anchoring efficiency, and the delamination of the composite, all of which decrease the mechanical strength by 31%. Therefore, the higher the friction force and clamping pressure, the more defects would be generated in the composite parts and the more changes in the shape of the plastically deformed rivet tip, leading to a lower level of quasi-static mechanical performance. All the joints failed by initial bearing of the composite and final rivet pull-out. The findings of this work can contribute to further improvement of the clamping design for industrial application.

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Time-Dependent Feed Force Modelling to Apply Feed Rate Strategies in the Drilling of Unsupported CFRP-Structures

Lissek

Hloch

Kaufeld

2018

Advances in Manufacturing Engineering and Materials

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Experimental Investigation of Clamping Systems and the Resulting Change of Cutting Conditions While Drilling Carbon Fiber Reinforced Plastics

Cited by 9 publications

References 20 publications

Experimental investigation on novel drilling strategy of CFRP laminates using variable feed rate

Experimental investigation on novel drilling strategy of CFRP laminates using variable feed rate

The Influence of Clamping Pressure on Joint Formation and Mechanical Performance of Ti6Al4V/CF-PEEK Friction-Riveted Joints

Time-Dependent Feed Force Modelling to Apply Feed Rate Strategies in the Drilling of Unsupported CFRP-Structures

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