Analysis of chip formation mechanisms and modelling of slabber process

Pfeiffer, Renaud; Collet, Robert; Denaud, Louis; Fromentin, Guillaume

doi:10.1007/s00226-014-0680-x

Cited by 10 publications

(7 citation statements)

References 14 publications

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“…Following the aforementioned overview, attention here is paid to cutting and the milling process which have not yet been investigated in terms of tool temperature [46,47]. The fact that temperature measurement of the milling cutter during the dynamic processes is much more complicated than the measurement of saw blade temperature can be considered one reason for this.…”

Section: Introductionmentioning

confidence: 99%

Methodology of Temperature Monitoring in the Process of CNC Machining of Solid Wood

et al. 2018

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The issue of the change in tool temperature as a result of the machining process is presented in this paper. The aim of the paper is to put forward a proposal and subsequently to verify the methodology of temperature monitoring in the process of computer numerical control (CNC) machining in real time. Subsequently, the data can be used in the process of adaptive machine-tool control. Experiments were used to determine whether the research method is appropriate. Oak, beech and spruce wood turning blanks with the thickness of 20 mm were machined using a 5-axis CNC machining centre. A temperature change observation resulting from the changes in parameters of the removed layer was used to test whether the research method is relevant. Parameters of the removed layer were affected by the changes in feed rate in the range from 1 ÷ 5 m·min−1 in the removed layer (1–5 mm) or in wood species used in the experiment. As emerges from the proposed methodology, it is possible to monitor the changes in tool temperature responding to minimal changes in technological parameters on a relatively small size of a milled surface quite accurately. Sensitivity to given changes in technological parameters as well as the importance of the methodology was proven.

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Section: Introductionmentioning

confidence: 99%

Methodology of Temperature Monitoring in the Process of CNC Machining of Solid Wood

et al. 2018

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“…Left uniform buckling compressive stress due to normal force to the shearing plane. Right water expulsion on side of the wood prove the buckling of wood structure in transverse compression fragmented like a pack of cards (Pfeiffer et al 2014), which is welcomed in chipping operations (Fig. 7a).…”

Section: °/90°modementioning

confidence: 99%

“…The most important criterion is the thickness of the chips. A model of the chip fragmentation was used to design canters with the help of the finite element method (Pfeiffer et al 2014).…”

Section: Green Wood Chippingmentioning

confidence: 99%

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Wood machining with a focus on French research in the last 50 years

Thibaut

Denaud

Collet

et al. 2016

Annals of Forest Science

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Abstract& Key message Wood machining is compulsory both for timber separation and the surfacing of wooden objects. The anisotropy, cellular nature and multi-scale level organisation of wood make its cutting complicated to study. During the last 50 years, most of the wood machining subjects were covered by French teams. & Context Woodcutting is a very old technology but scientific research is scarce on the subject. In the last 50 years, much work on basic mechanisms as well as on industrial processes has been done in France. In primary conversion such as sawing, veneer cutting or green wood chipping, huge progress comes from automation and the possibility of linking the process to log and product quality through new sensors. In secondary processing, much has been done on the links between the cutting process, surface qualification and the properties of these surfaces for further processing, such as gluing or coating. Tool wear depends on the cutting process, timber quality and species. Tradeoffs are required in tool technology and coating technologies may improve tool life. & Conclusion A large amount of knowledge and innovation has come from 50 years of worldwide research effort, with France being particularly active in this period. The transfer of skills from metals cutting industry was often a key, but much is needed to move closer to both metal cutting sector and woodcutting skills among craftsmen.

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“…In recent years, wood-chipping forces with bigger cutting depth is getting more attention. A popular method to measure single-reaction forces during chipping with a drum device is shown in Pfeiffer et al (2014Pfeiffer et al ( , 2015 through the use of a series of pendulums like Chardins. The forces are recorded by three-dimensional force sensors, which provide meaningful data about the cutting force associated with a direction while chipping.…”

Section: Introductionmentioning

confidence: 99%

Experimental determination of highly dynamic forces during wood trunk comminution with a drum chipper

Pichler

Leitner

Grün

et al. 2018

J Agricult Engineer

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Using large wood chips for heating systems in industrial applications is becoming popular. As a result, the requirements of the machinery that produces these large wood chips have increased, especially on the chipping tools and on the surrounding supportive components. This paper evaluates the acting main forces on a chipping drum that produces large wood chips via field and laboratory-based experimental measurements. In this study, a variety of strain gauges are applied to selected areas of the rotating chipping drum to measure localised strain conditions during wood-stem cutting. Four different wood species were investigated for comparison. Furthermore, the influence of sharp and dull knives is analysed. With the aid of experimental measurements and analysis on a laboratory scale, linear models are developed to determine the chipping force, which is cutting depth-dependent, for a variety of wood species. Testing parameters for such models are proposed via load spectra. The variability of the acting force value is evident. The maximum load on the drum affects at 10% of the time of a single cut. The largest applied forces are between 1.6 and 1.8 higher than the calculated average force. The commuting hornbeam sample exhibits the highest resistance against chipping compared to the three-other species. Additionally, a change in the load is easily recognised in the field test when utilising dull chipping blades. A reconstruction of the alternate load direction is based on laboratory testing.

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Analysis of chip formation mechanisms and modelling of slabber process

Cited by 10 publications

References 14 publications

Methodology of Temperature Monitoring in the Process of CNC Machining of Solid Wood

Methodology of Temperature Monitoring in the Process of CNC Machining of Solid Wood

Wood machining with a focus on French research in the last 50 years

Experimental determination of highly dynamic forces during wood trunk comminution with a drum chipper

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