On Realistic Modelling of Workpiece-Fixture Interaction

Rogers, Robert J.; Nadkarni, G.; Bonham, David J.

doi:10.1007/978-1-349-13796-1_83

Cited by 5 publications

(5 citation statements)

References 2 publications

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“…Hamedi [6] conducted a structural static analysis of the workpiece/fixture system for milling operations using a commercial finite element solver ANSYS. The analysis took into consideration the average value of the cutting force acting on the workpiece in an end milling operation, the friction between the workpiece and the fixturing element in dry clean conditions and the flexibility of the fixturing elements.…”

Section: Numerical Analysismentioning

confidence: 99%

Off line simulation system of machining processes

Deiab¹,

Veldhuis²

2007

Journal of the Franklin Institute

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Section: Numerical Analysismentioning

confidence: 99%

Off line simulation system of machining processes

Deiab¹,

Veldhuis²

2007

Journal of the Franklin Institute

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“…Hamedi et al [9] conducted a structural static analysis of the workpiece-fixture system for milling operations using a commercial finite element solver ANSYS. The analysis took into consideration the average value of the cutting force acting on the workpiece in an end-milling operation, the friction between the workpiece and the fixturing element in dry, clean conditions, and the flexibility of the fixturing elements.…”

Section: Literature Surveymentioning

confidence: 99%

On the effect of fixture layout on part stability and flatness during machining: A finite element analysis

Deiab

2006

Proceedings of the Institution of Mechanical Engineers, Part B:

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Deflection during machining can potentially introduce inaccuracies into the machined part geometry ultimately reducing its functionality. The traditional approach used in industry for fixture layout and configuration is mainly a trial and error scheme, which involves online examination of different combinations of fixture positions and clamping force magnitudes based on previous experience. Thus to be relevant, physics-based simulations of cutting processes must include the dynamics of the machine tool, fixture element, and part. In the current paper a developed simulation system is used to analyse and modify the fixture layout a priori to the metal removal process. This work analyses the effect of cutting forces, part features, and location of the fixture elements on the flatness and stability of the part. A typical industrial flexible part is used as a case study and its dynamic behaviour is analysed under different fixturing scenarios. The cutting forces are modelled using a mechanistic approach. The finite element method is used to model and analyse the dynamic behaviour of the fixtured part. Modal analysis was carried out using the finite element method and then results were verified experimentally.

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“…Also, the machining process has mostly been assumed to be static. Hamedi et al [2] conducted a structural static analysis of the workpiece/fixture system for milling operations using the finite element analysis package ANSYS. In the analysis the following parameters were considered: the average value of the cutting force acting on the workpiece in an end-mill operation, the friction between the workpiece and the fixturing element in dry clean conditions and the flexibility of the fixturing elements.…”

Section: Numerical Analysismentioning

confidence: 99%

“…Therefore, modelling of the friction conditions along the workpiece/fixture interface is critical. Contact problems with friction are generally complicated by the fact that the contact surface can experience slipping, sliding, rolling or tension release depending on the magnitude of the normal and tangential forces at the contact interface [2]. The non-linearity of the problem arises from the variation in the extent of the contact surfaces, the effect of friction and the intermittent nature of the cutting forces in milling.…”

Section: Introductionmentioning

confidence: 99%

Effect of workpiece/fixture dynamics on the machining process output

Deiab

Elbestawi

2004

Proceedings of the Institution of Mechanical Engineers, Part B:

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Selection of fixturing system parameters is a very important part of any manufacturing process. These parameters become more important when machining flexible parts, as the classical trial-and-error approach used in industry leads to more scrapped parts before reaching an acceptable fixture scenario. The presented simulation system integrates the effects of workpiece/fixture dynamics with the other factors contributing to the machining process dynamics and stability. It provides more accurate prediction of the process output, which helps in the design of the optimum fixture configuration prior to the production stage, consequently reducing both cost and lead time. Modelling of the frictional contact behaviour between the fixture element helps improve the prediction accuracy of the simulation system which accelerates the convergence to the optimum fixture configuration design and consequently improves the machined part dimensional accuracy and geometric integrity. The developed simulation is capable of modelling complicated part geometries by interfacing with commercial packages. The workpiece/fixture frictional contact is modelled using the finite element method. The frictional characteristics of the contact were determined experimentally. Face milling was used as a case study. Simulation results showed good agreement with the experimental validation.

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On Realistic Modelling of Workpiece-Fixture Interaction

Cited by 5 publications

References 2 publications

Off line simulation system of machining processes

Off line simulation system of machining processes

On the effect of fixture layout on part stability and flatness during machining: A finite element analysis

Effect of workpiece/fixture dynamics on the machining process output

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