Journal
CIRP ANNALS-MANUFACTURING TECHNOLOGY
Volume 63, Issue 1, Pages 85-88Publisher
ELSEVIER
DOI: 10.1016/j.cirp.2014.03.070
Keywords
Drilling; De lamination; Magnetic back-up
Funding
- National Science Council Taiwan, ROC [NSC100-2221-E-007-015-MY3]
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Drilling is an indispensible machining process for building a load-carrying structure of composite materials. Delamination defect is often produced at the exit of drilling, which threatens the service safety of the structure. There are back-up methods to reduce delamination when drilling the open flat-plate composite structure, but none for drilling into the curved-surface or hollow-shape structures. This study describes an innovative method using electromagnet and the deformable inexpensive colloid mixed with iron powder to produce magnetic back-up force at drilling exit to suppress delamination in industrial tube parts. The delamination extent can be reduced by 60-80%. The optimal volume ratio of powder-to-colloid is found 1:3. (C) 2014 CIRP.
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