Influence of the Fiber Cutting Angle on Work Piece Temperature in Drilling of Unidirectional CFRP

Hintze, Wolfgang; Schütte, Christoph; Steinbach, Stefan

doi:10.1007/978-3-319-01964-2_19

Cited by 14 publications

(13 citation statements)

References 6 publications

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“…One interesting feature was that in the drilling of UD and MD CFRPs, the high temperature regions both located at θ ∼0°. This is contradictory to previous reports that the peak temperature was located at θ ∼90° [23,24]. The difference could be attributed to that the temperature characteristics were dependent on the measurement method as well as the actual drill/CFRP cutting interactions.…”

Section: Temperature Characteristics From P-i To P-iiicontrasting

confidence: 96%

“…The difference could be attributed to that the temperature characteristics were dependent on the measurement method as well as the actual drill/CFRP cutting interactions. In the previous studies [7,9,14,24,36], researchers deployed the thermocouple to measure the temperature from inside of a workpiece. However, as compared to the bulk inner materials, the materials at the drill-exit surface suffered from more severe deflections/ damages due to the lack of constraint, therefore different temperature characteristics can be expected.…”

Section: Temperature Characteristics From P-i To P-iiimentioning

confidence: 99%

“…All these would lead to a much greater heat accumulation and temperature rise (even beyond T g ), see the unruptured region in Table 4 (II and III). As a result, it is no longer appropriate to predict the temperature characteristics in practical CFRP drilling only based on the orthogonal cutting results [23] or thermal couple measurement while drilling [24]. In terms of the cleancut region (C), less heat was accumulated on the drill-exit surface as most materials were removed.…”

Section: Temperature Characteristics From P-i To P-iiimentioning

confidence: 99%

“…More specifically, the reinforcing carbon fiber has a much better thermal conductivity than the resin matrix, hence the heat accumulation during cutting mostly occurs in the resin matrix. The thermal conduction processes of the stacking layers are also vastly different in the longitudinal (along fiber) and transverse (cross fiber) directions [20][21][22], and the temperature characteristic in the cutting of each layer is pertinent to the fiber cutting angle [23,24]. In particular, for MD CFRP that consists of multi-directional layers (e.g.…”

mentioning

confidence: 99%

“…Due to the unique thermal properties of tool material and CFRP, and different heat distributions in tool, workpiece and chips, the measured temperature can only represent the average temperature within a wide zone rather than the specific temperature of the machined surface. In other cases, thermocouples were embedded both inside and outside the hole periphery for temperature detection at the tool-workpiece interface, or placed outside the hole to capture the temperature characteristics of the overall CFRP drilling process [7,9,14,24,36]. However, as the sensor's position is much restricted spatially by the experiment layout, it is difficult to obtain sufficient and accurate temperature data to reveal the comprehensive temperature characteristics at drill exit.…”

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confidence: 99%

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Drill-exit temperature characteristics in drilling of UD and MD CFRP composites based on infrared thermography

Zhang

Wang

et al. 2018

International Journal of Machine Tools and Manufacture

119

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A B S T R A C TThis paper presents a comprehensive study on the complex drill-exit temperature characteristics in the drilling of unidirectional (UD) and multidirectional (MD) CFRPs using a state-of-art microscopy infrared imaging system. For the first time, temperature variation and distribution at drill exit have been revealed in full detail, associated with the CFRP material properties and drilling conditions. Results suggest that the actual drill/CFRP interactions have critical but similar effects on the drill-exit temperatures for UD and MD CFRPs. Specifically, three distinct cutting regions with varying temperature characteristics are evident when the main cutting edge is acting on the drill exit material. In all cases, the temperature distribution features elliptical shape, of which the eccentricity depends on the lay-up sequence and the drilling depth. In addition, the real-time temperature profiles and 2D/3D maximum temperature distribution maps are created with high visualization. With the aid of those findings, the relationships between drilling temperature maxima, their locations and drilling depths have been discovered and temperature effects on drill-exit damages have been elucidated for the first time. MD CFRP is proven more difficult to achieve high drilling qualities at certain fiber cutting angles than UD CFRP due to the associated temperature effects. Such important knowledge enables the identification of the heat affected zones and subsequently informs strategies for reducing the negative temperature effects.

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Section: Temperature Characteristics From P-i To P-iiicontrasting

confidence: 96%