Multi-Response Optimization in Drilling of Glass Epoxy Polymer Composites Using Simulated Annealing Approach

2013 ◽  
Vol 766 ◽  
pp. 123-141 ◽  
Author(s):  
S.R. Karnik ◽  
V.N. Gaitonde ◽  
S. Basavarajappa ◽  
J. Paulo Davim
Keyword(s):  
Surface Roughness ◽  
Simulated Annealing ◽  
Polymer Composites ◽  
Epoxy Polymer ◽  
Thrust Force ◽  
Epoxy Composite ◽  
Spindle Speed ◽  
Epoxy Composites ◽  
Machining Performance ◽  
Controllable Factors

The glass epoxy polymer composites are broadly used in various engineering fields because of outstanding properties. Even if, these composites are produced as near net shapes, the machining has to be carried out in the last stage of manufacture. Drilling is used to install the fasteners for assembly of laminates, but drilling of composites is somewhat complex task owing to exceedingly abrasive nature of reinforcement. Hence the choice of optimal process parameters is essential for successful machining performance. This paper illustrates the application of simulated annealing (SA) approach for simultaneous minimization of various machinability aspects such as thrust force, hole surface roughness and specific cutting coefficient during drilling of glass epoxy polymer composites. The experiments were performed as per full factorial design (FFD) for glass epoxy composites (without filler) and silicon carbide (SiC) filled glass epoxy composites materials. The mathematical models of proposed machinability characteristics were constructed using response surface methodology (RSM) with spindle speed and feed as controllable factors. The experimental investigation indicates that the SiC filled glass epoxy composite provides better machinability compared to glass epoxy composite without the addition of filler. The proposed machinability models were then utilized with SA to select the optimal parameters such as spindle speed and feed, which results in minimal thrust force, hole surface roughness and specific cutting coefficient.

Surface characteristics and machining performance of TiAlN-, TiN- and AlCrN-coated tungsten carbide drills

2018 ◽  
Vol 233 (4) ◽  
pp. 1075-1086 ◽  
Author(s):  
Chaiya Dumkum ◽  
Pakin Jaritngam ◽  
Viboon Tangwarodomnukun
Keyword(s):  
Surface Roughness ◽  
Tool Wear ◽  
Tungsten Carbide ◽  
Thrust Force ◽  
Surface Characteristics ◽  
Average Error ◽  
Force Model ◽  
Machining Performance ◽  
Coating Materials ◽  
Drilling Performance

This article presents a comprehensive analysis of surface characteristics and drilling performance of uncoated and coated tungsten carbide drills. The single- and double-layer coatings of TiN, TiAlN and AlCrN were examined in terms of surface roughness, microhardness and crack resistance. In addition, drilling torque and thrust force were experimentally measured and compared to the developed models based on the drilling mechanics and drill geometries. Tool wear and hole surface roughness were also considered to assess the machining performance of different coated tools. The results revealed that all coated drills can offer better cut surface quality, 28% lower cutting loads and longer tool life than the uncoated drills. Although AlCrN was found to be the hardest coating material among the others, it caused large wear on the cutting edges and poor surface roughness of produced holes. The lowest torque and thrust force were achievable using TiN-coated drill, while the use of TiAlN coating resulted in the lowest surface roughness and smallest tool wear. Furthermore, the drilling torque and thrust force model developed in this study were found to correspond to the experimental measures with the average error of 8.4%. The findings of this work could facilitate the selection of coating materials to advance the machining performance.

Machining of a Rock Surface Shaver with a Piezoelectric Actuator forIn situAnalysis in Lunar and Planetary Exploration

2016 ◽  
Vol 10 (4) ◽  
pp. 533-539 ◽  
Author(s):  
Katsushi Furutani ◽  
◽  
Eiji Kagami ◽  
Keyword(s):  
Surface Roughness ◽  
Piezoelectric Actuator ◽  
Thrust Force ◽  
Sample Surface ◽  
Rock Surface ◽  
Composition Analysis ◽  
Machining Performance ◽  
Asteroid Exploration ◽  
Offset Voltage

Future lunar, planetary, and asteroid exploration will strongly demandin situanalysis of rock samples to obtain data related to various aspects. For precise composition analysis, a sample surface should be smoothed. In this paper, a surface shaver with a piezoelectric actuator is proposed and its machining performance in air is investigated. Shaving teeth are mounted at the ends of a pair of lever mechanisms. The device is pressed through four springs onto the workpiece with a linear actuator. When a sinusoidal voltage of 50 Vp-pand an offset voltage of 25 V were applied, the resonance frequency was 556 Hz and the unloaded amplitude of the shaving teeth was 0.77 mmp-p. Basalt workpieces were machined for 10 min in air. Increasing the thrust force reduced the surface roughness, although the amount removed diminished with a further increase in the thrust force. The surface roughness varied widely not only due to the amount removed but also due to containing the pores.

The Effect of Cutting Force Vibration on Machining Quality for Reaming ZL102 Alloy with PCD Step Reamer

2018 ◽  
Vol 764 ◽  
pp. 279-290
Author(s):  
X.D. Wang ◽  
W.L. Ge ◽  
Y.G. Wang
Keyword(s):  
Surface Roughness ◽  
Cutting Force ◽  
Cutting Forces ◽  
Thrust Force ◽  
Maximum Amplitude ◽  
Spindle Speed ◽  
Machining Process ◽  
Cutting Fluid ◽  
Hole Quality ◽  
Force Vibration

The characteristics of cutting forces vibration and its effects to the hole quality in reaming aluminum cast alloy using a poly-crystalline diamond (PCD) step reamer in dry and wet conditions were studied. First, centrifugal force vibration model of the PCD step reamer during machining process was established and through the analysis of the model, it can be concluded that the maximum amplitude of the vibration is positively related to the angular velocity of the reamer. Then, thrust force and cutting torque were measured by a Kistler Dynamometer during reaming process and these vibration frequency and amplitude were analyzed by fast Fourier transformation (FFT). Hole quality was evaluated by hole diameter and surface roughness. Results show that, as the spindle speed increases, the stability of thrust force and cutting torque deteriorates gradually, and there was a severe vibration in the cutting force and the surface roughness when the spindle speed reached 10000 rpm in wet and 7000 rpm in dry cutting conditions. Compared the variation of hole surface roughness and vibration characteristic of cutting forces, it can be observed that the trends are very consistent, the surface roughness deteriorates when cutting forces become unstable. Therefore,the cutting forces stability was an important factor that influence the hole quality. Cutting fluid has a positive effect to stabilize the reaming process and was beneficial to improve the hole quality.

Performance of Reground Tools in Drilling

2012 ◽  
Author(s):  
Jose Aecio Gomes de Sousa ◽  
Marcelo do Nascimento Sousa ◽  
Alisson Rocha Machado
Keyword(s):  
Surface Roughness ◽  
Tool Life ◽  
Thrust Force ◽  
Cemented Carbide ◽  
Machining Performance ◽  
Form Errors ◽  
First Time

The present work evaluates the performance of step drills, new and after regrinding. The tools were made of P20 cemented carbide coated with TiAlN. The routine of re-coating them after regrinding were varied (no recoating, recoating over the previous coating and recoating after removing the previous coating). The output parameters considered for determining the machining performance were: tool life, thrust force, torque, form errors (roundness and cylindricity) and surface roughness (Ra and Rz parameters). The results generated with the resharpened tools were compared to those obtained with a new tool (first time used). The results showed that in general the reground tools showed worse performance than the new tools, regardless the parameter considered. Only the tools that have undergone the process of cleanness of the previous coating and then reground and recoated (with the same type of coating) showed results similar to the new tools. The tools with no recoating and those that received the recoating over the previous showed, practically in all tests, higher thrust force and torque, larger form errors and worse surface roughness than the new tools.

scholarly journals Development and Analysis of the Physicochemical and Mechanical Properties of Diorite-Reinforced Epoxy Composites

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2421
Author(s):  
Amirbek Bekeshev ◽  
Anton Mostovoy ◽  
Yulia Kadykova ◽  
Marzhan Akhmetova ◽  
Lyazzat Tastanova ◽  
...  
Keyword(s):  
Gas Phase ◽  
Thermal Destruction ◽  
Epoxy Polymer ◽  
Epoxy Composite ◽  
Chemical Interaction ◽  
Strength Properties ◽  
Epoxy Composites ◽  
Mineral Filler ◽  
Pyrolysis Products ◽  
Thermal Stability Of

The aim of this paper is to study the effect of a polyfunctional modifier oligo (resorcinol phenyl phosphate) with terminal phenyl groups and a dispersed mineral filler, diorite, on the physicochemical and deformation-strength properties of epoxy-based composites. The efficiency of using diorite as an active filler of an epoxy polymer, ensuring an increase in strength and a change in the physicochemical properties of epoxy composites, has been proven. We selected the optimal content of diorite both as a structuring additive and as a filler in the composition of the epoxy composite (0.1 and 50 parts by mass), at which diorite reinforces the epoxy composite. It has been found that the addition of diorite into the epoxy composite results in an increase in the Vicat heat resistance from 132 to 140–188 °C and increases the thermal stability of the epoxy composite, which is observed in a shift of the initial destruction temperature to higher temperatures. Furthermore, during the thermal destruction of the composite, the yield of carbonized structures increases (from 54 to 70–77% of the mass), preventing the release of volatile pyrolysis products into the gas phase, which leads to a decrease in the flammability of the epoxy composite. The efficiency of the functionalization of the diorite surface with APTES has been proven, which ensures chemical interaction at the polymer matrix/filler interface and also prevents the aggregation of diorite particles, which, in general, provides an increase in the strength characteristics of epoxy-based composite materials by 10–48%.

Comparative Tribological and Mechanical Property Analysis of Nano-Silica and Nano-Rubber Reinforced Epoxy Composites

2018 ◽  
Vol 875 ◽  
pp. 53-60 ◽  
Author(s):  
Abdulaziz Kurdi ◽  
Li Chang
Keyword(s):  
Friction And Wear ◽  
Epoxy Polymer ◽  
Epoxy Composite ◽  
Transfer Film ◽  
Epoxy Composites ◽  
Nano Silica ◽  
Different Types ◽  
Film Layer ◽  
Silica Addition ◽  
Pin On Disk

Nano-filler reinforced epoxy composites has been investigated in this study subjected to various mechanical and pin-on-disk tribological tests. Two different types of nano-filler were used namely, rigid nano-silica (SiO2) particles and soft nano-rubber particles. Incorporation of nano-filler in polymer matrix enhance mechanical properties. In addition, tribological response of composites are also better compared to neat epoxy polymer. However, the effect of nano-silica addition is much more pronounced than that of nano-rubber due to the high rigidity of nano-silica reinforced epoxy composite. This was mainly attributed to transfer film layer (TFL) formation. The TFL was further investigated by electron microscope and nanoindentor. The best set of tribological properties was achieved at 8 wt. % nano-silica addition. This was due to better reinforcement dispersion and continuous transfer film layer formation which eventually control the overall friction and wear mechanism.

Study on the Combined Machining Technology of Sawing and Grinding for Drilling Aramid/Epoxy Composites

2012 ◽  
Vol 565 ◽  
pp. 436-441 ◽  
Author(s):  
Hang Gao ◽  
Yuan Zhuang ◽  
Ben Wang ◽  
Jun Liang Huang
Keyword(s):  
Thrust Force ◽  
Rake Angle ◽  
Epoxy Composites ◽  
Machining Performance ◽  
Drilling Tool ◽  
Machining Quality ◽  
Drilling Tools ◽  
Grinding Mechanism ◽  
Conventional Drilling

Aiming at the problem of poor machinability in conventional drilling of aramid/epoxy composites, the formation reason for fuzzing damage was analyzed. In order to obtain better machining quality, a combined machining technology based on sawing and grinding mechanism was proposed and the corresponding drilling tools were developed. Drilling experiments were conducted to explain the machining performance of the drilling tools. The results show that the sawing drilling tool with negative rake angle can effectively restrain fuzzing damage and the sawing-grinding drilling tool decreases the thrust force about 20%~55% with electroplated diamond abrasives. The combined machining technology of sawing and grinding achieves damage-free machining quality in drilling of aramid/epoxy composites.

Multi Response Optimization Using Taguchi-Grey-Fuzzy Method in Drilling of Kevlar Fiber Reinforced Polymer (KFRP) Stacked

2016 ◽  
Vol 836 ◽  
pp. 179-184 ◽  
Author(s):  
Am Mufarrih ◽  
Bobby Oedy Pramoedyo Soepangkat ◽  
Iwan Krisnanto
Keyword(s):  
Surface Roughness ◽  
Orthogonal Array ◽  
Thrust Force ◽  
Cutting Speed ◽  
Drilling Process ◽  
Machining Performance ◽  
Fuzzy Method ◽  
Kevlar Fiber ◽  
Response Optimization ◽  
Feeding Speed

A research was conducted for the optimization in the drilling process of KFRP stacked, with multiple performance characteristics based on the orthogonal array with Taguchi-grey-fuzzy method. The experimental study was conducted under varying the drilling process parameters (feeding speed (mm/min) and cutting speed (m/min)) and tool geometries (point geometry and point angle (degree)). The optimized multiple performances characteristics were thrust force, torque and surface roughness. The quality characteristics of thrust force, torque and surface roughness were smaller-is-better. The experimental design used L18 orthogonal array with two replications. Experimental results have shown that machining performance in the drilling process can be improved effectively through this method.

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