scholarly journals Mathematically Modeling Parameters Influencing Surface Roughness in CNC Milling

2012 ◽  
Vol 18 (1) ◽  
pp. 47-59
Author(s):  
Engin Nas ◽  
Gurcan Samtas ◽  
Halil Demir
Keyword(s):  
Surface Roughness ◽  
Cnc Milling

Application of Taguchi and Response Surface Methodologies for Surface Roughness in Rotary Tool Polishing Hardness Mould Steels

2011 ◽  
Vol 87 ◽  
pp. 82-89
Author(s):  
Potejanasak Potejana ◽  
Chakthong Thongchattu
Keyword(s):  
Surface Roughness ◽  
Response Surface ◽  
Laser Scanning ◽  
Cutting Speed ◽  
Optimal Level ◽  
Confocal Laser ◽  
Milling Machine ◽  
Cnc Milling ◽  
Polishing Process ◽  
Cnc Milling Machine

This research proposes a new application of 3-axis CNC milling machine for polishing the 60 HRC hardness steels. The rotary polishing tools are designed by refer to the end-mill ball nose’s design. The diamond powder are coated in rotary polishing tools by resinoid bonding method and concentrated in 4.4 karat/cm2. The Zig-milling tool paths are used to polish the hardness steel. After polishing, the confocal laser scanning microscope is used to analyze the arithmetic mean surface roughness of the hardness steels. The L12 orthogonal array of the Taguchi’s method is selected to conduct the matrix experiment to determine the optimal polishing process parameters. The diamond grit size and cutting speed of the rotary polishing tools, feed rate and step over of the tool path, the depth of polishing process penetration, and polishing time are used to study. The combination of the optimal level for each factor of the hardness steel polishing process are used to study again in the confirmation experiment. The predicted signal to noise ratio of smaller - the better under optimal condition are calculated by using the data from the experiment. The combination of the optimal level for each factor are used to study again in the confirmation experiment and the result show that polishing time was a dominant parameter for the surface roughness and the next was depth of penetration. The response surface design is then used to build the relationship between the input parameters and output responses. The experimental results show that the integrated approach does indeed find the optimal parameters that result in very good output responses in the rotary polishing tools polished hardness mould steel using CNC milling machine. The mean surface roughness of hardness steel polishing process is improved by the diamond rotary tools with the 3-axis CNC milling machine.

Optimization of surface roughness by design of experiment techniques during CNC milling machining

2021 ◽  
Author(s):  
Deepak Kumar Yadav ◽  
Nitesh Kumar Dixit ◽  
Deepak Agarwal ◽  
Sanchit Kumar Khare
Keyword(s):  
Surface Roughness ◽  
Design Of Experiment ◽  
Cnc Milling

scholarly journals CNC milling of EVA foam with varying hardness for custom orthotic shoe insoles and process parameter optimization

2019 ◽  
Vol 13 (3) ◽  
pp. 5347-5370
Author(s):  
P. W. Anggoro ◽  
A. A. Anthony ◽  
B. Bawono ◽  
J. Jamari ◽  
A. P. Bayuseno ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Tool Path ◽  
Hybrid Approach ◽  
Machining Parameters ◽  
Cnc Milling ◽  
Cnc Milling Machine ◽  
Step Over ◽  
High Degree ◽  
Shoe Insoles ◽  
Eva Foam

CNC milling strategy of EVA foam with varying hardness to provide a high degree of surface roughness of orthotic shoe insoles is presented in this work. Machining parameters (tool path strategy, spindle speed, feed rate, and step over) in addition to hardness material and wide tolerance insoles were optimized using a hybrid approach of Taguchi-Response Surface Methodology (TM-RSM). The aim of this research was to develop mathematical models and determine the optimum machining parameters which could be applied for the CNC milling of EVA foam as the insoles. Experiments were performed on a CNC milling machine with a standard milling cutter and run under dry coolants. The effects of the six parameters on the average values of surface roughness were initially analyzed by an S/N ratio of TM. Optimal conditions were established from the TM and then used to determine the optimum values in RSM modeling. The final results indicate the significant improvement of percentages (0.24% and 4.13%) in the surface roughness of the insoles obtained with TM-RSM as compared to the TM analysis. It is envisaged the present study would add to the understanding of production for orthotic shoe insoles through CNC milling.

scholarly journals Wear assessment of current aesthetic crowns compared with human enamel after two finishing procedures: In vitro study

F1000Research ◽  
2019 ◽  
Vol 8 ◽  
pp. 1115
Author(s):  
Ahmed M. Sha'aban ◽  
Gihan A. El Naggar ◽  
Rasha Nabil ◽  
Mohamed A. Rashad ◽  
Yara S. Attia
Keyword(s):  
Surface Roughness ◽  
Wear Behavior ◽  
Control Group ◽  
Cnc Milling ◽  
Crown Group ◽  
Reliable Technique ◽  
Molar Teeth ◽  
Polishing Procedures ◽  
Ceramic Crowns

Background: Surfaces of ceramic crowns are modified several times before being exposed to wear in the oral cavity.  Grinding and different finishing procedures may be associated with teeth wear due to increased surface roughness. Limited data is available with regard to the effect of polishing procedures on the surface roughness and wear behavior of ceramic crowns.  This study was conducted to assess the influence of polished and polished-ground-repolished surface finish on the roughness and wear performance of three ceramic crowns. Methods: 36 natural 1st molar teeth were prepared using a CNC milling machine and classified into three groups (n=12/group): zirconia, E-max and hybrid ceramic (VITA ENAMIC) crowns. Each group was classified into two subgroups (n=6/subgroup): polished and polished-ground-repolished crowns. Natural molar teeth served as an unrestored control group (n=6). All samples were loaded into a chewing simulator for 100,000 cycles and subjected to 600 thermo-cycles in temperature changes to simulate changes in intraoral temperature. Natural maxillary 1st premolar teeth were collected and only buccal half (cusp) of sectioned tooth was used as antagonists. A profilometer was used to detect the roughness before and after masticatory cycles. The occlusal surface was analysed using a scanning electron microscope (SEM). Results: The E-max crown group had the highest mean surface roughness value (0.267µm) followed by VITA ENAMIC crown group (0.266 µm), while the lowest mean surface roughness value recorded for zirconia crown (0.257µm). The difference between these means was not significant. The polished-ground–repolished group had a higher mean surface roughness (0.266 µm) compared with the polished group (0.260 µm), which was not significantly different. Conclusions: All tested ceramic crowns showed surface roughness with values within acceptable clinical parameters (~0.2 µm). Additionally, intraoral polishing procedures could be considered a reliable technique for smoothing of zircona, E.max and VITA ENAMIC crowns after occlusal adjustment.

scholarly journals Experimental Investigation on Surface Roughness and Metal Removal Rate of Aluminium 2024 Alloy

2021 ◽  
Vol 9 (9) ◽  
pp. 1424-1429
Author(s):  
Dr. V. S. Srinivasa Murthy
Keyword(s):  
Surface Roughness ◽  
Metal Removal ◽  
Removal Rate ◽  
Xrd Analysis ◽  
Milling Machine ◽  
Cnc Milling ◽  
Sintering Process ◽  
Dimensional Changes ◽  
Cnc Milling Machine ◽  
2024 Alloy

Abstract: The purpose of this work is to investigate experimentally the surface roughness and MRR while machining of aluminium 2024 alloy which is prepared by powder metallurgical technique. Aluminium 2024 alloy prepared with different composition such as Pure Al, 1.5 W% of Mg and 2-6 % of Cu powders. Powders are blended with ball milling machine according to the composition required and specimens are prepared in square shape die (25*25mm) by applying uniaxial load of 200Mpa. The sintering process was performed at 594 0C for 60 min and cooled at room temperature. SEM and XRD analysis was carried out to know various characteristics like green density, dimensional changes during sintering, sintering density, mechanical properties and microstructures. Finally the Surface roughness and MRR during machining with CNC milling machine at different depth of cuts was also evaluated. Keywords: Aluminium 2024 alloy, surface roughness, MRR, SEM and XRD analysis

scholarly journals Evaluation of surface roughness, dimensional and shape accuracy of Al₂O₃ ceramics in hardened state after milling

Mechanik ◽  
2019 ◽  
Vol 92 (12) ◽  
pp. 790-794
Author(s):  
Aleksander Przesmycki ◽  
Tadeusz Sałaciński ◽  
Maciej Winiarski ◽  
Rafał Świercz ◽  
Tomasz Chmielewski
Keyword(s):  
Surface Roughness ◽  
Ceramic Materials ◽  
Structure Study ◽  
Cnc Milling ◽  
Technological Parameters ◽  
Shape Accuracy ◽  
Cnc Milling Machine ◽  
Hardened State ◽  
Pcd Tools ◽  
Geometric Surface

The effect of technological parameters of machining on surface roughness, dimensional and shape accuracy in the process of milling Al2O3 ceramics in hardened state was evaluated. The unique properties of ceramic materials cause more and more interest in them in various branches of industry. Ceramics in the hardened state can be processed using unconventional methods and conventional methods while maintaining the appropriate technological parameters. Ceramics cutting tests were carried out in a hardened state (face and shape milling) on a CNC milling machine using PCD tools. Geometric surface structure study and measurements of geometric dimensions were made.

Surface roughness optimization on steel fiber reinforced geopolymer fly ash by CNC milling operation

2019 ◽  
Author(s):  
N. Najwa ◽  
S. M. Nasir ◽  
M. M. A. Abdullah ◽  
N. A. Shuaib ◽  
Faheem Tahir
Keyword(s):  
Surface Roughness ◽  
Fly Ash ◽  
Steel Fiber ◽  
Cnc Milling ◽  
Fiber Reinforced ◽  
Milling Operation
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