Cutting forces prediction in generalized pocket machining

Wei, Zhaocheng; Wang, Minjie; Han, Xiao

doi:10.1007/s00170-010-2528-3

Cited by 28 publications

(10 citation statements)

References 16 publications

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“…For the fabrication of vascularized structures mimicking the native vasculatures, cutting force will be estimated considering curved channel geometries and tool path planning of curved surface trajectories, which will require different considerations compared to straight-line cutting forces. [32][33][34][35][36]…”

Section: Resultsmentioning

confidence: 99%

Force modeling to develop a novel method for fabrication of hollow channels inside a gel structure

Barua

Giria

Datta

et al. 2019

Proc Inst Mech Eng H

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Fabrication of hollow channels with user-defined dimensions and patterns inside viscoelastic, gel-type materials is required for several applications, especially in biomedical engineering domain. These include objectives of obtaining vascularized tissues and enclosed or subsurface microfluidic devices. However, presently there is no suitable manufacturing technology that can create such channels and networks in a gel structure. The advent of three-dimensional bioprinting has opened new possibilities for fabricating structures with complex geometries. However, application of this technique to fabricate internal hollow channels in viscoelastic material has not been yet explored to a great extent. In this article, we present the theoretical modeling/background of a proposed manufacturing paradigm through which hollow channels can be conveniently fabricated inside a gel structure. We propose that a tip connected to a robotic arm can be moved in X-, Y-, and Z-axis as per the desired design. The tip can be moved by a magnet or mechanical force. If the tip is further trailed with porous tube and moved inside the viscoelastic material, corresponding internal channels can be fabricated. To achieve this, however, force modeling to understand the forces that will be required to move the tip inside viscoelastic material should be known and understood. Therefore, in our first attempt, we developed the computational force modeling of the tip movement inside gels with different viscoelastic properties to create the channels.

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Section: Resultsmentioning

confidence: 99%

Force modeling to develop a novel method for fabrication of hollow channels inside a gel structure

Barua

Giria

Datta

et al. 2019

Proc Inst Mech Eng H

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show abstract

“…The maximum/minimum values of cutting force can be obtained by using an algorithm called the golden section searching [22], which is a robust method for one dimensional minimization without the calculation of the derivative. Generally the cutting force function is like-sine-wave; thus the bracketing condition for the initial points can be easily satisfied [23].…”

Section: Simulation and Experimental Resultsmentioning

confidence: 99%

Cutting force prediction in ball end milling of sculptured surface with Z-level contouring tool path

Wei¹,

Wang²,

Zhu³

et al. 2011

International Journal of Machine Tools and Manufacture

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“…One solution to compensate for the change of engagement is to control the feed rate. Several experiments were made in this field with a view to keeping the value of the material removal rate constant [20][21][22][23]; nevertheless, some of the associated problems have remained unsolved. On the one hand, the applied machine tool, when operating at slower and higher speeds, should be capable of reaching the desired speed within short periods of time [24], and, on the other hand, it must also be borne in mind that high engagements, which are sometimes used, may cause chatter and a thermal shock [25].…”

Section: Introductionmentioning

confidence: 99%

The fast constant engagement offsetting method for generating milling tool paths

Jacsó

Mátyási

Szalay

2019

Int J Adv Manuf Technol

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It is a well-established fact that when equidistant tool paths are used for 2.5D milling operations tool load varies based on the functions of path curvature. This phenomenon makes the optimal selection of cutting parameters more difficult, and the local load peaks are also detrimental to machining stability and tool life. Numerous publications address possible solutions to eliminate the problems caused by varied cutting parameters. The best solution for this is to keep the cutter engagement at a constant value. Nowadays, several methods are available to generate tool paths which are able to maintain constant cutter engagement, but the widespread use of such solutions is significantly hindered, because in this scenario complex calculations are required. This article offers a solution to this problem by presenting a new non-equidistant offsetting method for ensuring a constant cutter engagement angle. The algorithm developed for this purpose is based on simple geometrical equations and allows for its widespread use just like pixel-based methods. Concerning this new solution, computation needs and uniform tool load are verified by simulation and through experiments. The experiments have shown favourable results. Keywords Tool path generation. Cutter engagement. High-speed milling. Cutting force. Non-equidistant offsetting Nomenclature a e Effective radial immersion [mm] a p Axial depth of cut [mm] c(t) Parametric representation of workpiece contour [{mm, mm}] f z Feed per tooth [mm] h ex Maximum chip thickness [mm] i, j Step index [−] n Spindle speed [1/min] p(t) Parametric representation of tool path [{mm, mm}] r tool Tool radius [mm] s Stepover [mm] t Free parameter of curve equations [−] v Feed vector [{mm, mm}] v c Cutting speed [m/min] v f Feed rate [mm/min] w Trochoidal step [mm] z Number of teeth [−] C Entry point of the cutting edge [{mm, mm}] D tool Tool diameter [mm] MRR Material removal rate [mm 3 /min] P Tool path point [{mm, mm}] Q Exit point of cutting edge [{mm, mm}] V(x, y) Vector field [{mm, mm}, {mm, mm}] a, β Angle parameters [ ∘ ] Δs Stepsize[−] θ Cutter engagement angle [ ∘ ]

show abstract

Cutting forces prediction in generalized pocket machining

Cited by 28 publications

References 16 publications

Force modeling to develop a novel method for fabrication of hollow channels inside a gel structure

Force modeling to develop a novel method for fabrication of hollow channels inside a gel structure

Cutting force prediction in ball end milling of sculptured surface with Z-level contouring tool path

The fast constant engagement offsetting method for generating milling tool paths

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