Varying CFRP workpiece temperature during slotting: Effects on surface metrics, cutting forces and chip geometry
| Autor: | Richard J. Scaife, Kevin Kerrigan, A.R.C. Sharman, Yoshihiro Takikawa, Sam Ashworth, James O. Meredith, J. Patrick A. Fairclough |
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| Rok vydání: | 2019 |
| Předmět: |
0209 industrial biotechnology
Work (thermodynamics) Materials science Scanning electron microscope Thermosetting polymer 02 engineering and technology 010501 environmental sciences Edge (geometry) Chip 01 natural sciences 020901 industrial engineering & automation Machining Thermocouple General Earth and Planetary Sciences Composite material Focus variation 0105 earth and related environmental sciences General Environmental Science |
| Zdroj: | Procedia CIRP. 85:37-42 |
| ISSN: | 2212-8271 |
| Popis: | Carbon fibre reinforced thermoset polymer (CFRP) components are typically edge trimmed using a milling process to achieve final part shape. During this process the material is subject to significant heating at the tool-workpiece interface. Damage due to heating is fibre orientation specific; for some orientations it can lead to matrix smearing, potentially hiding defects and for others it can increase pullout. Understanding these relationships is critical to attaining higher throughput by edge milling. For the first time this study focuses on active heating of the CFRP rather than passive measurement, through use of a thermocouple controlled system to heat a CFRP workpiece material from room temperature (RT) up to 110 °C prior to machining. Differences in cutting mechanisms for fibres oriented at 0, 45, 90 and -45° are observed with scanning electron microscopy (SEM), and quantified with using focus variation with an increase of 89.9% Sa reported between RT and 110°C CFRP panel pre-heating. Relationships to cutting forces through dynamometer readings and tool temperature through infra-red (IR) measurements are also made with a novel optical method to measure cut chips presented. Results show an increase in chip length and width for increasing cutting temperature from RT to 110°C (3.39 and 0.79 µm for length and width, respectively). This work improves current understandings of how the cutting mechanism changes with increased temperature and suggests how improved milling throughput can be achieved. |
| Databáze: | OpenAIRE |
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