Optimization of Machining Parameters in CFRP/Ti Stacks Drilling

Krishnaraj, V.; Prabukarthi, A.; Santhosh, M.; Senthilkumar, M.; Zitoune, Rédouane

doi:10.1115/msec2012-7216

Cited by 5 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the delamination of internal material is significantly less than that of hole entrance and exit. 17–20 The maximum of F a i is averaged that is, the worst delamination is ignored. The calculating result is better than the actual state.…”

Section: Evaluation Index System Of Hole Surface Qualitymentioning

confidence: 99%

A subjective-objective evaluation method of hole surface quality in drilling CFRP-Ti stacks

Liu

Wang

Zhang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

Hole surface quality in drilling carbon fiber-reinforced plastics and titanium alloy (CFRP-Ti) stacks is a key factor affecting high-quality assembly and reliable usage of the structure so it need be reasonably evaluated. However, there is no standardized evaluation system of hole surface quality in drilling CFRP-Ti stacks. The existing evaluation indexes cannot meet the evaluation requirements on the surface quality of the hole. This paper proposes a subjective-objective evaluation method to evaluate the surface quality of the hole in drilling CFRP-Ti stacks. Firstly, the evaluation factors are determined by experiments, including CFRP delamination, CFRP hole entrance tears, surface roughness of CFRP and Ti, and the evaluation system is established according to defect characteristics and industry standards. Secondly, the subjective evaluation model is established based on the improved analytic hierarchy process, the objective evaluation model is established based on the entropy weight method and the subjective and objective combination weight calculation method is obtained based on the principle of minimum discriminant information. Finally, the surface quality of the hole is evaluated by subjective, objective, subjective-objective evaluation methods respectively. The result shows that subjective-objective evaluation method is more reasonable and effective.

show abstract

Section: Evaluation Index System Of Hole Surface Qualitymentioning

confidence: 99%

A subjective-objective evaluation method of hole surface quality in drilling CFRP-Ti stacks

Liu

Wang

Zhang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

show abstract

“…Therefore, it is not easy to select suitable parameters that perform ideally for both materials in a stacked form. Some of the studies were dedicated to selecting compromised process parameters to drill holes in both materials of the stack [2,[10][11][12]. Yet some researchers studied tool wear mechanisms, hole qualities, manufacturing cost, and so forth, when drilling the CFRP/Ti stacks, and they changed the parameters during drilling process and applied the most suitable parameters for each material [4,5,13].…”

Section: Introductionmentioning

confidence: 99%

A Force Sensorless Method for CFRP/Ti Stack Interface Detection during Robotic Orbital Drilling Operations

Fang

Pan

Han

et al. 2015

Mathematical Problems in Engineering

View full text Add to dashboard Cite

Drilling carbon fiber reinforced plastics and titanium (CFRP/Ti) stacks is one of the most important activities in aircraft assembly. It is favorable to use different drilling parameters for each layer due to their dissimilar machining properties. However, large aircraft parts with changing profiles lead to variation of thickness along the profiles, which makes it challenging to adapt the cutting parameters for different materials being drilled. This paper proposes a force sensorless method based on cutting force observer for monitoring the thrust force and identifying the drilling material during the drilling process. The cutting force observer, which is the combination of an adaptive disturbance observer and friction force model, is used to estimate the thrust force. An in-process algorithm is developed to monitor the variation of the thrust force for detecting the stack interface between the CFRP and titanium materials. Robotic orbital drilling experiments have been conducted on CFRP/Ti stacks. The estimate error of the cutting force observer was less than 13%, and the stack interface was detected in 0.25 s (or 0.05 mm) before or after the tool transited it. The results show that the proposed method can successfully detect the CFRP/Ti stack interface for the cutting parameters adaptation.

show abstract

Optimization of Drilling Process on Carbon-Fiber Reinforced Plastics Using Genetic Algorithm

et al. 2020

View full text Add to dashboard Cite

The usages of carbon-fiber reinforced polymer (CFRP) in aerospace, defense, and structural fields are increasing due to their excellent properties. However, the materials design, forming of material, machine tool and processing conditions are major tasks in manufacturing industries. Particularly, the micro feature making on macro-components using vertical machining center is a challenge nowadays. In this work, two different drill bits, such as high-speed steel (HSS) and solid carbide (SC) micro-drill, were used to make drilling on CFRP material. The performance of drills was evaluated by obtaining minimum delamination and stress in drilling by varying cutting velocity (CV), feed rate (FR), and air pressure (AP). Regression equations were formed according to the measured quality performance characteristics. The linear weighted method-based combined objective function algorithm and Genetic Algorithm was followed to multi-objective optimization. Besides, the most influencing factors were also identified and discussed using analysis of variance. The results explained that the SC micro-drill performance was better than HSS micro-drill. Also, the CV has the most eminent parameters followed by FR.

show abstract

Optimization of Machining Parameters in CFRP/Ti Stacks Drilling

Cited by 5 publications

References 0 publications

A subjective-objective evaluation method of hole surface quality in drilling CFRP-Ti stacks

A subjective-objective evaluation method of hole surface quality in drilling CFRP-Ti stacks

A Force Sensorless Method for CFRP/Ti Stack Interface Detection during Robotic Orbital Drilling Operations

Optimization of Drilling Process on Carbon-Fiber Reinforced Plastics Using Genetic Algorithm

Contact Info

Product

Resources

About