Wyniki wyszukiwania - BazTech

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Symulacja numeryczna warstwy skrawanej w procesie frezowania naroży wewnętrznych

Burek Jan, Flejszar Rafał, Jamuła Barbara

Mechanik

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2019

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R. 92, nr 7

412--414

PL

Przedstawiono analityczno-numeryczny model przekroju warstwy skrawanej w procesie frezowania powierzchni wklęsłych. Wykonano badania symulacyjne w celu wyznaczenia pola przekroju warstwy skrawanej. Opracowano strategię pozwalającą na zwiększenie stabilności pola przekroju warstwy skrawanej podczas wchodzenia frezu w obszar naroża wewnętrznego.

EN

The analytical and numerical model of the cross-section of the machined layer in the process of milling of concave rounding is presented. Simulation tests were carried out to determine the cross-sectional area of the cutting layer. A strategy has been developed that allows to increase the stability of the cross-section area of the cutting layer when the mill enters the inner corner area.

2

Simulation analysis of the wrap angle in internal corners finishing milling

Burek Jan, Flejszar Rafał

Mechanik

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2019

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R. 92, nr 11

726--728

EN

The simulation of the cutting layer in the CAD system during milling internal corners of elements with complex geometry has been presented. A case of variable cutting width in the finishing process was considered and the strategy of multitransitional corner milling was analyzed.

PL

Przedstawiono symulację warstwy skrawanej w systemie CAD podczas frezowania wewnętrznych naroży elementów o skomplikowanej geometrii. Rozpatrywano przypadek zmiennej szerokości skrawania przy obróbce wykończeniowej oraz przeanalizowano strategię wieloprzejściowego frezowania naroży.

3

Influence of machining strategies and technological history of semi-finished product on the deformation of thin-wall elements after milling

Zawada-Michałowska M., Kuczmaszewski J., Pieśko P., Łogin W.

Advances in Science and Technology. Research Journal

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2017

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Vol. 11, no 3

289--296

EN

The paper presents an analysis of the influence of machining strategy and the technological history of semi-finished product on the deformation of thin-walled elements made of aluminium alloy EN-AW 2024 after milling. As a part of this research work, five machining strategies are analysed. Additionally, the rolling direction of the plate (longitudinal and transversal) is taken into account as a technological history. During the research, the focus is set on the effects of the machining strategies i.e. HPC, HSM and conventional machining as well as their combinations on the post-machining stresses and deformations. Each of these strategies has a different range of technological parameters, which results in differences in machining efficiency and introduces post-machining stresses to the surface layer of the workpiece that vary in values and nature (i.e. compressive stresses or tensile stresses). The conducted study shows that larger deformations were obtained for transversal rolling direction in each analyzed case. The lowest deformation both for transversal and longitudinal rolling direction were achieved for the HSM and CM strategy.

4

Performance Evaluation of Machining Strategy for Engine-Block Manufacturing

Tigist A. F., Bianchi M. F., Archenti A., Nicolescu M.

Journal of Machine Engineering

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2015

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Vol. 15, No. 4

81--102

EN

This paper will introduce a novel methodology for the performance evaluation of machining strategies of engine-block manufacturing. The manufacturing of engine components is vital to the automotive and vehicle manufacturing industries. Machining are a critical processes in the production of these parts. To survive and excel in the competitive manufacturing environment, companies need to improve as well as update their machining processes and evaluate the performance of their machining lines. Moreover, the lines and processes have to be robust in handling different sources of variation over time that include such examples as demand fluctuations, work-piece materials or even any changes in design specifications. A system dynamics modelling and simulation approach has been deployed to develop a methodology that captures how machining system parameters from the machining process are interacted with each other, how these connections drive performance and how new targets affect process and machine tool parameters through time. The developed model could provide an insight of how to select the crucial machining system parameters and to identify the effect of those parameters on the output of the system. In response to such an analysis, this paper provides (offers) a framework to examine machining strategies and has presented model that is useful as a decision support system for the evaluation and selection of machining strategies. Here a system dynamics methodology for modelling is applied to the milling operation and the model is based on an actual case study from the engine-block manufacturing industry.