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020 _aTHE0009153(Local)
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040 _aUMP
_beng
_cUMP
_erda
090 _aFTKPM .N39 2021 r Thesis
100 1 _aMohd Nazir Mat Nawi,
_eauthor.
245 1 0 _aInvestigation on paint removal operation using multiple passes in waterjet cleaning process /
_cMohd Nazir Mat Nawi
264 1 _aKuantan, Pahang :
_bUMP,
_c2021
264 4 _c© 2021
300 _axv, 77 pages :
_billustrations (some color) ;
_c30 cm. +
_e1 CD ROM
336 _atext
_2rdacontent
336 _atext
_2rdacontent
337 _aunmediated
_2rdamedia
337 _acomputer
_2rdamedia
338 _avolume
_2rdacarrier
338 _acomputer disc
_2rdacarrier
347 _atext file
_bPDF
_2rda
500 _aFaculty of Manufacturing and Mechatronic Engineering Technology
502 _aThesis (Master of Science) -- Universiti Malaysia Pahang – 2021
504 _aIncludes bibliographical references
520 3 _aThe need of cleaning automotive paint without secondary pollution has recently become a major concern globally. The waterjet technology has extended its application to include surface treatment, machining, cleaning and cutting of materials. Plain waterjet is frequently used for cleaning since its offers environmentally friendly concept which results near zero pollution to the surroundings. The present work aims to analyse and optimise the use of multiple passes in waterjet cleaning process for removal of automotive paint using response surface methodology (RSM) approach. The effect of surface roughness (Ra) and its topography were analysed. RSM, analysis of variance (ANOVA), fractional factorial at 2-levels and central composite design (CCD) were utilized to optimize the plain waterjet process parameters for effective cleaning of paint. It was observed that the lateral feed and pressure were the most significant control factors in influencing the cleaning performance criteria. Based on the surface topography, it was found that the paint was removed with varying degrees of substrate damage. A mathematical model was developed using linear regression analysis to predict the Ra in terms of cleaning parameters of plain waterjet process. The model had successfully predicted the Ra of the cleaned automotive parts within the limit of this study. A confirmation test at optimum parameters was later conducted to verify the improvement of quality characteristic during the waterjet paint removal process. The recommended optimal parametric combinations for better Ra were found to be waterjet pressure of 34 MPa, traverse rate of 500 mm/min, standoff distance of 10 mm, number of passes of 1 and lateral feed of 0.6 mm. It can be concluded that the selected optimal combination of plain waterjet parameters satisfies the actual requirement for cleaning of automotive paint in real practice. The results from the present work based on RSM and quantitative modelling are valuable in analysing the effect of various waterjet processing parameters thus attaining an appropriate control over the cleaning efficiency of automotive paint
610 2 0 _aFaculty of Manufacturing and Mechatronic Engineering Technology
_xDissertations
650 0 _aUniversities and colleges
_xDissertations
650 0 _aTheses
942 _2lcc
_cTHESIS