Wyniki wyszukiwania - BazTech

1

Predictive modeling and machining performance optimization during drilling of polymer nanocomposites reinforced by graphene oxide/carbon fiber

Kumar Jogendra, Verma Rajesh Kumar, Mondal Arpan Kumar

Archive of Mechanical Engineering

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2020

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LXVII, nr 2

229--258

EN

This paper explores the parametric appraisal and machining performance optimization during drilling of polymer nanocomposites reinforced by graphene oxide/-carbon fiber. The consequences of drilling parameters like cutting velocity, feed, and weight % of graphene oxide on machining responses, namely surface roughness, thrust force, torque, delamination (In/Out) has been investigated. An integrated approach of a Combined Quality Loss concept, Weighted Principal Component Analysis (WPCA), and Taguchi theory is proposed for the evaluation of drilling efficiency. Response surface methodology was employed for drilling of samples using the titanium aluminum nitride tool. WPCA is used for aggregation of multi-response into a single objective function. Analysis of variance reveals that cutting velocity is the most influential factor trailed by feed and weight % of graphene oxide. The proposed approach predicts the outcomes of the developed model for an optimal set of parameters. It has been validated by a confirmatory test, which shows a satisfactory agreement with the actual data. The lower feed plays a vital role in surface finishing. At lower feed, the development of the defect and cracks are found less with an improved surface finish. The proposed module demonstrates the feasibility of controlling quality and productivity factors.

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Doświadczalna i symulacyjna analiza wpływu drgań kontaktowych stycznych wzdłużnych na siłę napędu w ruchu ślizgowym

Gutowski P., Leus M.

Modelowanie Inżynierskie

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2009

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T. 6, nr 37

111-120

PL

W pracy przedstawiono wyniki doświadczalnej i teoretycznej analizy wpływu drgań stycznych wzdłużnych na siłę tarcia i na silę napędu w ruchu ślizgowym. W badaniach doświadczalnych mierzono zmiany siły napędu w czasie przesuwu ciała górnego po wprawianym w ruch drgający, w kierunku stycznym do przesuwu, ciele dolnym. Gdy amplituda prędkości tych drgań była większa od składowej stałej prędkości przesuwu następowało zmniejszenie siły napędu. Badania symulacyjne przeprowadzono w środowisku Matlab-Simulink. W obliczeniach wykorzystano dynamiczne modele tarcia. Uzyskano bardzo dobrą zgodność wyników badań symulacyjnych z wynikami badań doświadczalnych.

EN

In the paper the results of theoretical and experimental analysis of the longitudinal tangential vibration effect on the driving force in sliding motion are presented. In experimental tests the changes of driving force during sliding the upper body on the excited into vibration in tangential direction lower body, were measured. When the amplitude of these vibrations was greater than the constant component of sliding velocity the significant reduction of driving force is obser-ved. The simulation analysis was carried out in the Matlab-Simulink environment. In computations the dynamic models of friction were used. Very good consistency of simulation and experimental results is obtained.

3

Badania doświadczalne i modelowanie oddziaływania drgań stycznych wzdłużnych na siłę napędu w ruchu ślizgowym

Leus M., Gutowski P., Parus A.

Archiwum Technologii Maszyn i Automatyzacji

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2009

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Vol. 29, nr 4

127-137

PL

W artykule przedstawiono wyniki badań doświadczalnych i analiz symulacyjnych wpływu drgań kontaktowych stycznych wzdłużnych na siłę tarcia i na siłę napędu w ruchu ślizgowym. Stwierdzono, że warunkiem koniecznym zmniejszenia siły napędu niezbędnej do utrzymania ciała w ruchu ślizgowym po podłożu drgającym w kierunku stycznym jest większa amplituda prędkości drgań wzdłużnych niż składowa stała prędkości przesuwu. Badania symulacyjne wykonano w środowisku Matlab/Simulink. W obliczeniach wykorzystano dynamiczne modele tarcia. Badania doświadczalne przeprowadzono na oryginalnym, własnym stanowisku badawczym. Uzyskano bardzo dobrą zgodność wyników badań symulacyjnych i doświadczalnych.

EN

In the paper the results of theoretical and experimental analyses of the longitudinal contact tangential vibration effect on the friction and driving forces in sliding motion are presented. It was observed that the necessary condition for reduction of driving force which was required for maintain a sliding motion on the base excited into vibration, was that the amplitude of velocity of longitudinal tangential vibration should be greater than the constant component of sliding velocity. The simulation analyses were carried out in Matlab/Simulink environment. The experimental tests were performed on the original, made by authors, experimental stand. Very good consistency of simulation and experimental results was obtained.

4

Comparative performance analysis and modeling of tool wear in drilling

Wen C. C., Soon L. T., Sivarao

International Journal of Applied Mechanics and Engineering

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2004

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Vol. 9, no spec.

33-38

EN

To date, process supervision or monitoring is mainly performed by limit value checking of some measurable variables. In high automated machine tool faults like tool breakage often cause long outage times and high cost. Drill holes are one of the most common manufacturing features specified on process plans. Because holes are drilled in finished products, the rejection parts due to poor hole quality can be very expensive. It was estimated that 60% of all parts rejections due to poor hole quality. On the other hand, a work piece must often be re-machined or completely rejected when the tool has failed. The investigation of this paper deals with comparative quality and performance of twist drills of different make possessing same geometry. The paired comparison is to be carried out by considering thrust force and torque as the main criteria to determine the better tool among tool X and tool Y. Analytical methods namely, statistical analysis and inverse coefficient matrix analysis were used to validate the experimental result.

5

Comparative analysis and modeling of surface roughness in drilling

Wen C. C., Soon L. T., Sivarao

International Journal of Applied Mechanics and Engineering

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2004

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Vol. 9, no spec.

305-311

EN

Drilling is one of the basic, most frequently performed materials removing process in manufacturing industry. In spite of significant increase in the demand for economically producing holes, drill manufacturing is still considered as an esoteric art. The drilling operation is frequently used as a preliminary step for many operations like boring, reaming and tapping. Surface roughness plays an important role in product quality and manufacturing process planning. Twist drills are used in a diameter range from 1 to 20mm. Surface finish quality of work piece is an issue of main concern to the manufacturing industry and the inspection of surface roughness of the work piece is a very important technology. Drill wear has a bad effect on the surface finish and dimensional accuracy of the work piece. There still exists a lack of knowledge on the exact relationship between the point geometry, the grinding process parameters and the process machines, resulting in many methods for drill production and consequently wide variation in process performance. The variables selected for modeling of surface roughness are cutting speed, cutting feed, machining time and thrust force. The relative comparison of drilled surface produced by twist drills by different make (tool X and tool Y) is to be carried out by actual measurement, statistical analysis and inverse coefficient matrix method.