Mechanics and dynamics of thread milling process

Wan, Min; Altintaş, Yusuf

doi:10.1016/j.ijmachtools.2014.07.006

Cited by 75 publications

(17 citation statements)

References 32 publications

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“…Araujo et al [15] used the local rake angle approach to study geometrical analysis of thread milling parameters in Ti-6Al-4V with metric threads, and an analysis of variance for determining the influence parameters and bring a physical understanding of the process and focused in finding the optimum flute angle. Wan and Altintas [16] developed a detailed analysis of the dynamics of thread milling.…”

Section: Introductionmentioning

confidence: 99%

Investigation of tool deflection during milling of thread in Cr-Co dental implant

Araujo

Fromentin

2018

Int J Adv Manuf Technol

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Milling is a good option for manufacturing internal threads in hard-to-cut dental components due to lower cutting forces. In the case of a very small drilled diameter, the tool cannot be large enough to reduce tool deflection nor sufficiently small to avoid the influence of the tool penetration. As a consequence, both situations need to be considered and no other research study dealt with this aspect for the modeling of thread milling forces. This article deals with the analysis of forces, deflection, and undercutting during machining of one typical internal thread geometry used for implants in a chrome-cobalt dental alloy. The geometry is analyzed considering the influence of tool penetration and it is presented new equations to identify the regions where it occurs. Machining experiments are conducted acquiring cutting forces and tool axis position in order to calculate the tool radial forces and estimate tool deflection. Manufactured threads geometry is measured to evaluate dimension quality. It can be claimed that the tool trajectory should consider one extra revolution around the drilled hole in order to machine the undercut material due to tool deflection for this small tool diameter.

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Section: Introductionmentioning

confidence: 99%

Investigation of tool deflection during milling of thread in Cr-Co dental implant

Araujo

Fromentin

2018

Int J Adv Manuf Technol

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“…Thus, the main question mentioned above remains an open problem. Next, it is shown that this problem requires the determination of the cut cross section area and of cutting forces [22][23][24][25]. Thread milling cutter is described as a conical machining tool surface (or a set of surfaces).…”

Section: Introductionmentioning

confidence: 99%

Metric Buttress Thread Milling and Turning on CNC Machines

Щуров¹,

Nemitova²,

Shchurova³

et al. 2018

Int. J. Automot. Mech. Eng.

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Present-day catalogues of tool manufacturers do not contain information on milling cutters for planetary milling of metric buttress threads with nominal pitches on computer numerical control (CNC) machines. This paper presents the results of theoretical and experimental investigation of buttress threads cutting on 3-axis CNC machines. The theoretical investigation is based on the kinematic method of envelope determination. This analytical solution has been verified by the solid modelling method and experiments. It has been proven that standard metric buttress threads with nominal pitches cannot be cut by planetary milling on the 3-axis CNC machines. At the same time, metric buttress threads with small pitches can be produced; such cases are described in this paper. However, thread surface quality after planetary milling is problematic. The technology of initial productive thread milling followed by final thread turning is suggested to obtain metric buttress thread using a new type of millingturning cutters. The results of this investigation can be useful for industrial plants if buttress thread milling on 3-axis CNC machines is necessary.

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“…However, in the machining process, which includes fixturing and cutting, the workpiece is always accompanied by a different degree of deformation. In the cutting process, besides some important factors such as the cutting forces, 1–4 the material removal, 5 and so on, the clamping forces in the fixturing process are also a crucial consideration to affect the workpiece deformations. 6…”

Section: Introductionmentioning

confidence: 99%

A unified approach to multi-fixturing layout planning for thin-walled workpiece

Qin

Wang

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part B:

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It is crucial to properly design the fixturing layout described by fixturing parameters, such as the fixturing sequence, the placement of clamping force, the locator position, and so on. This is because the clamping deformation of the thin-walled workpiece can influence extremely the machining accuracy and surface quality. Generally speaking, the finite element method can be used to easily obtain the deformation rule of the workpiece caused by one single fixturing parameter. But it is difficult to reveal the relationship between the multiple fixturing parameters and the clamping deformation of workpiece. Therefore, the workable finite element model of multi-fixturing layout is above all established for the thin-walled workpiece. Thus, clamping deformations can be calculated to be the training samples of the neural network. Next, according to the training samples, the prediction model is suggested for obtaining the clamping deformation from multiple fixturing parameters. When the prediction errors are defined as fitness function, the genetic algorithm is developed to search the optimal initial weights and thresholds for the neural network. The optimized neural network has better generalization and prediction ability than the non-optimized one. Ultimately, the embedded optimal model with the objective of minimizing the clamping deformation is presented for a multi-fixturing layout. When the individual fitness of each generation is constructed as a function of the clamping deformations, the genetic algorithm can be skillfully used to solve the embedded optimal model. Moreover, the experiment is conducted to validate the prediction method with good agreement between the predicted results and the experimental data. The above presented “analysis—prediction—control” method of clamping deformation not only improves the calculation efficiency of clamping deformation but also provides a basic theory of fixturing layout design for the thin-walled workpiece.

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Mechanics and dynamics of thread milling process

Cited by 75 publications

References 32 publications

Investigation of tool deflection during milling of thread in Cr-Co dental implant

Investigation of tool deflection during milling of thread in Cr-Co dental implant

Metric Buttress Thread Milling and Turning on CNC Machines

A unified approach to multi-fixturing layout planning for thin-walled workpiece

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