On chip formation mechanism in orthogonal cutting of bone

Liao, Zhirong; Axinte, Dragoş

doi:10.1016/j.ijmachtools.2015.12.004

Cited by 115 publications

(73 citation statements)

References 35 publications

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“…According to previous research in bone orthogonal cutting [6], the critical UCT value of the transition from shear cutting to serrated cutting (ℎ ) is about 10µm and from serrated cutting to fractured cutting (ℎ ) is about 90~100µm. Based on this, when selecting the threshold ( ) and the interval angle between two micro-cutting edges ( ), the MUCTs of micro-cutting edges (ℎ ) and main cutting combined cutting) mode.…”

Section: Geometrical Characteristics Of the Proposed Toolmentioning

confidence: 98%

“…1b-i). This critical value of the feed rate, which is related to the spiral pitch and will be estimated in paragraph 6, would be set to match with the threshold of transition between serrated cutting and fracture cutting mechanisms of the bone [6]; thus, when the feed rate is under the critical value shear/serrated cutting mode ( Fig. 1a-i and ii) could be achieved by main cutting edge while the micro-cutting edge not working.…”

Section: Tool Design Concept With Controlled Bone Cutting Mechanismmentioning

confidence: 99%

“…The workpiece used in this study was acquired from mid-diaphysis of bovine femurs since the distribution of constituents is very similar to the human bone [2]. The workpiece samples (50mm length, 2mm width, 15mm height), cut parallel to the bone long axis direction, were utilised on the milling experiments within 1 hour after being prepared to keep the bone in fresh condition; the sample preparation followed the previously established procedure [6]. Based on a preliminary testing programme, the same set of machining parameters has been used for both milling cutters, namely: cutting speed vs=6.28m/min, feed rate vf=0.03~0.18m/min, radial depth of cut ae=2mm and axial depth of cut ap=2mm.…”

Section: Performance Testing/evaluation Of the Proposed Toolmentioning

confidence: 99%

“…On the other hand, while showing a semi-brittle behaviour with anisotropic structure, fracture damage can easily occur in bone cutting causing damages of the surrounding tissues while leading to a poor surface quality which can slow patient's post-operation recovery [6,7]; the morphologies and formation mechanisms of the chip have been found to vary when changing the uncut chip thickness (UCT) in bone cutting as: shear cutting with UCT<10µm ( Fig. 1a-i); serrated cutting with 10µm<UCT<90µm( Fig.…”

Section: Introductionmentioning

confidence: 99%

“…1a-ii); fracture cutting with 90µm<UCT ( Fig. 1a-iii) [6]. As fracture has the tendency to propagate inwards from the cut surface, and it is difficult to control its initiation, the cutting quality is mainly dependent on the surgeon's technique.…”

Section: Introductionmentioning

confidence: 99%

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A novel cutting tool design to avoid surface damage in bone machining

Liao

Axinte

Gao

2017

International Journal of Machine Tools and Manufacture

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With its anisotropic structure, bone machining occurs as shear/serrated cutting mechanisms at low values of uncut chip thickness while at high values it results in fracture cutting mechanisms which lead to significant tissues damages; hence, utilising conventional tools at high material removal rates comes with drawback on surface damages, situation that needs to be avoided. This paper reports on a novel design of a milling cutter which includes on the back of main cutting edge a succession of micro-cutting edges arranged on an Archimedes spiral that allows the limitation of surface damage.That is, by adjusting the feed rate, this tool design allows the change of the cutting mechanism as follows:(i) "shear/serrated" cutting mode: when the feed rate is smaller than a pre-established threshold, only the main cutting edges work which yields a shear/serrated cutting mechanism; (ii) combined "fracture & shear"cutting mode occurring at high feed rate caused by: the main cutting edges working in fracture cutting mechanism while the subsequent micro-cutting edges work under shear cutting mechanism, combination which leads to significant reduction of bone surface damages. This new tool concept was materialised on a solid diamond composite, characterised by excellent heat conduction and low wear rates. Cutting experiments with various values of feed rates showed that the proposed tool designed concept significantly reduced the fracture damage of bone cut surface as well as cutting temperature compared with the dimensionally equivalently conventional tool.

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Section: Geometrical Characteristics Of the Proposed Toolmentioning

confidence: 98%

Section: Tool Design Concept With Controlled Bone Cutting Mechanismmentioning

confidence: 99%