Interaction of manufacturing process and machine tool

Brecher, Christian; Esser, Martin; Witt, Stephan

doi:10.1016/j.cirp.2009.09.005

Cited by 192 publications

(81 citation statements)

References 83 publications

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“…For the method proposed here, the main sources of error in the stability diagram calculation come from the modelling of the process, the tool-path discretization and the input parameters. The hypotheses assumed in the model for simplicity's sake introduce an error: the simplified non-trochoidal kinematic of the tool edges [39], the linear forces model or the relation between dynamic forces and dynamic displacements [40][41][42]. The stability algorithm can introduce an error in the solution, particularly if the single-frequency solution is used in interrupted milling.…”

Section: Discussionmentioning

confidence: 99%

Chatter avoidance in the milling of thin floors with bull-nose end mills: Model and stability diagrams

Campa

Lacalle

Celaya

2011

International Journal of Machine Tools and Manufacture

122

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The milling of thin parts is a high added value operation where the machinist has to face the chatter problem. The study of the stability of these operations is a complex task due to the changing modal parameters as the part losses mass during the machining and the complex shape of the tools that are used. The present work proposes a methodology for chatter avoidance in the milling of flexible thin floors with a bull-nose end mill. First, a stability model for the milling of compliant systems in the tool axis direction with bullnose end mills is presented. The contribution is the averaging method used to be able to use a linear model to predict the stability of the operation. Then, the procedure for the calculation of stability diagrams for the milling of thin floors is presented. The method is based on the estimation of the modal parameters of the part and the corresponding stability lobes during the machining. As in thin floor milling the depth of cut is already defined by the floor thickness previous to milling, it is proposed the use of stability diagrams that relate the tool position along the tool-path with the spindle speed. Hence, the sequence of spindle speeds that the tool must have during the milling can be selected. Finally, this methodology has been validated by means of experimental tests.

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Section: Discussionmentioning

confidence: 99%

Chatter avoidance in the milling of thin floors with bull-nose end mills: Model and stability diagrams

Campa

Lacalle

Celaya

2011

International Journal of Machine Tools and Manufacture

122

View full text Add to dashboard Cite

show abstract

“…The dimensional accuracy of forged components is process dependent and affected by inherent factors including the work material, tools/ die, and forming press and random variations such as inconsistent die stroke, initial temperature, and lubricant condition. Similar to many other manufacturing processes such as machining and grinding, the forming process and press interaction are major factors influencing the quality and accuracy of formed parts, as highlighted in a recent review paper [2].…”

Section: Introductionmentioning

confidence: 99%

Quantification of press elasticity in the forging of three-dimensional complex shapes

Lü

2011

Proceedings of the Institution of Mechanical Engineers, Part B:

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This paper presents an improved approach to characterize press elastic behaviour and to quantify the effect of press elasticity in the forging of three-dimensional (3D) complex shapes. Using a stiffness matrix formulation, the overall press elasticity is characterized by press elastic deformation and initial clearances of the press guideway. The effect of press elasticity in forging is evaluated by implementing the press stiffness matrix formulation into the 3D forging simulation using a user subroutine. An industrial-based 3D blade forging case study was carried out to assess the robustness and efficiency of this approach in the forging of 3D complex shapes. Compared with cases without press elasticity, the results show that the press elasticity has less effect on forging force requirements, material deformation, and stress and strain distributions. However, the effect of press elasticity is more apparent on the dimensional and shape accuracy of the forged blade with the initial guideway clearance as a major source for dimensional errors compared with the press elastic deformation. The case study also shows that this approach can be easily implemented for evaluating press tool-related effects in forging simulation and design.

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“…In operation state, the external conditions of the machine and the friction between various components change dynamically. Machine dynamics is also in the state of change [3,4].…”

Section: Introductionmentioning

confidence: 99%

An Approach of Exciting CNC Machine Tools Based on Worktable Empty Running Excitation

Mao¹,

He²,

Hong-qi³

et al. 2018

Proceedings of the 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017)

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Abstract. Dynamic characteristic of machine tool is an important factor which affects machining quality and machining efficiency. Traditional experimental modal analysis method requires the measured structure to be in a relatively static state. So the dynamic characteristics of machine tool structure cannot be measured in operating state. In this paper, an approach of exciting CNC machine tools based on worktable empty running excitation is proposed. The machine tool structure is excited by inertial force generated during the reciprocating motion of machine worktable. The motion of worktable is designed and the influencing factors of excitation are analyzed. The effect of feed speed and acceleration to excitation is analyzed through experiment. Compared to impact test in static state, the method is performed in running state. So it can reflect the dynamics of machine tools in operation accurately.

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Interaction of manufacturing process and machine tool

Cited by 192 publications

References 83 publications

Chatter avoidance in the milling of thin floors with bull-nose end mills: Model and stability diagrams

Chatter avoidance in the milling of thin floors with bull-nose end mills: Model and stability diagrams

Quantification of press elasticity in the forging of three-dimensional complex shapes

An Approach of Exciting CNC Machine Tools Based on Worktable Empty Running Excitation

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