The Effect of Pressure on Warpage of Dumbbell Plastic Part in Injection Moulding Machine

Md Ali, Mohd Amran and Mohd Sani, Siti Salmah and Mohd, Zaki and RAJA ABDULLAH, RAJA IZAMSHAH and Abu Bakar, Mohd Hadzley and Sivarao, Subramonian and Kasim, Mohd Shahir and Sulaiman, Mohd Amri (2014) The Effect of Pressure on Warpage of Dumbbell Plastic Part in Injection Moulding Machine. Applied Mechanics and Materials, 529. pp. 61-66. ISSN 1662-7482.

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Abstract. The optimization of processing parameters on warpage of polypropylene (PP) in the application of injection moulding machine was studied. The appropriate parameters were adjusted to reduce the warpage defect on the tensile test specimen of dumbbell. The type of injection moulding machine used in this research is Arburg 420C 800-250C. Four parameters that have been investigated; injection pressure, clamping pressure, back pressure and holding pressure. A concept of design of experiment (DOE) has been applied using Taguchi method to determine the suitable parameters. To measure the warpage of the dumbbell, digital height gauge was used to measure the flatness of the part surface. According the analysis of variance (ANOVA), the most significant factor that effect the warpage was holding pressure by 57.82%, followed with back pressure by 25.75%, clamping pressure by 16.27% and injection pressure by 0.16%. It is found that the optimum parameters setting that have been obtained were injection pressure at 950 bar, clamping pressure at 600 kN, holding pressure at 700 bar and back pressure at 75 bar. The depreciation value of warpage minimum index in this experiment was decreased by 4.6% after confirmation run.

Item Type: Article
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Manufacturing Engineering > Department of Manufacturing Process
Depositing User: Dr. Mohd Amran Md Ali
Date Deposited: 10 Feb 2014 00:43
Last Modified: 28 May 2015 04:15
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