Prediction of contact conditions and theoretical roughness in manufacturing of complex implants by toric grinding tools

Denkena, Berend; León, Luis de; Turger, Anke; Behrens, Leif

doi:10.1016/j.ijmachtools.2010.03.008

Cited by 18 publications

(10 citation statements)

References 8 publications

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“…Let E(t) be the ellipse resulting from the projection along P of the cutter centre-torus circle, and Redonnet et al (2013). This correct assumption in the case of machining by grinding tool like (Denkena et al 2010(Denkena et al , 2013, seems also to be correct in the case of milling at low feed rate. The notion of "low feed rate" remains largely subjective and in most cases it should be possible to use higher feed rate than it is for finishing operation due to the low depth of cut and thus low cutting forces- Tai and Fuh (1994).…”

Section: Analytical Model Of Scallop Height Context and Analytic Exprmentioning

confidence: 93%

An analytical model taking feed rate effect into consideration for scallop height calculation in milling with torus-end cutter

Segonds¹,

Seitier²,

Bordreuil³

et al. 2017

J Intell Manuf

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Feed rate effect on scallop height in complex surface milling by torus-end mill is rarely studied. In a previous paper, an analytical predictive model of scallop height based on transverse step over distance has been established. However, this model doesn't take feed rate effect into consideration. In the present work an analytical expression of scallop height, including feed rate effect, is detailed in order to quantify feed rate effect and thus to estimate more precisely the surface quality. Then, an experimental validation is conducted, comparing the presented model predictions with experimental results. Actually, the share of the scallop height due to feed effect is highly dependent on the machining configuration. However, most of time, the feed effect on total scallop height values is far from being negligible. Keywords Free-form surface • CNC machine-tool • End-mill • Toroidal cutter • Effective tool radius • Feed rate • Scallop height B Stéphane Segonds

show abstract

Section: Analytical Model Of Scallop Height Context and Analytic Exprmentioning

confidence: 93%

An analytical model taking feed rate effect into consideration for scallop height calculation in milling with torus-end cutter

Segonds¹,

Seitier²,

Bordreuil³

et al. 2017

J Intell Manuf

View full text Add to dashboard Cite

show abstract

“…In this case, the knowledge of machining simple geometric components cannot be uncritically conferred. Frequently changing contact conditions in the grinding process should be taken into consideration in order to ensure a constant material removal and high surface quality [117].…”

Section: Surface Finishing Processesmentioning

confidence: 99%

“…The issue of frequently changing contact conditions can be solved by precisely adjusting the tool position and varying the contact angle. Denkena et al [117] described the contact conditions in a frontal grinding of workpieces analogical to knee joints with toric grinding pins. In their work, new calculation models were developed to predict the process characteristics such as geometric contact length/width, engagement zone and the material removal rate.…”

Section: Precision Grindingmentioning

confidence: 99%

State of the art of bioimplants manufacturing: part I

Kang

Fang

2018

Adv. Manuf.

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Bioimplants are becoming increasingly important in the modern society due to the fact of an aging population and associated issues of osteoporosis and osteoarthritis. The manufacturing of bioimplants involves an understanding of both mechanical engineering and biomedical science to produce biocompatible products with adequate lifespans. A suitable selection of materials is the prerequisite for a long-term and reliable service of the bioimplants, which relies highly on the comprehensive understanding of the material properties. In this paper, most biomaterials used for bioimplants are reviewed. The typical manufacturing processes are discussed in order to provide a perspective on the development of manufacturing fundamentals and latest technologies. The review also contains a discussion on the current measurement and evaluation constraints of the finished bioimplant products. Potential future research areas are presented at the end of this paper.

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“…Using this information Ahn et al (2002) optimized polishing pressure, feed rate and tool wear. Denkena et al [15] theoretically estimated the roughness with a rigid corner-radius end-tool used in 5-axis. This model was made based on the nominal tool envelope.…”

Section: Fig 1 Production Of Knee Prosthesesmentioning

confidence: 99%

Optimization of pre-polishing parameters on a 5-axis milling machine

Moumen

Chaves‐Jacob

Bouaziz

et al. 2015

Int J Adv Manuf Technol

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Pre-polishing and polishing stages are considered as semi-finishing and finishing stages in workpiece production. As a rule, these operations are carried out manually. These stages are health hazards for the operator and may lead to geometrical defects on workpieces. This paper proposes and optimizes a method to perform these operations on a common 5-axis milling machine. This method uses the flank of a flexible cylindrical tool to link the machine position and the exerted polishing pressure. The toolpath proposed comprises a carrier trajectory on which a loop pattern is repeated. Subsequently, experimental optimization of the pre-polishing cost is proposed, coupled with an estimation of the roughness obtained. Firstly, a screening Design Of Experiments is used to identify the most influential factors of this process. Based on these influential factors, a response surface is used to obtain experimental models to estimate the pre-polishing cost per volume and resulting roughness. These models are used to optimize the pre-polishing factors to reduce the process cost whilst maintaining specific roughness.

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Prediction of contact conditions and theoretical roughness in manufacturing of complex implants by toric grinding tools

Cited by 18 publications

References 8 publications

An analytical model taking feed rate effect into consideration for scallop height calculation in milling with torus-end cutter

An analytical model taking feed rate effect into consideration for scallop height calculation in milling with torus-end cutter

State of the art of bioimplants manufacturing: part I

Optimization of pre-polishing parameters on a 5-axis milling machine

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