Optimization Of Plastic Injection Manufacturing Process To Minimize Defects In Motorcycle Components AT PT XYZ
DOI:
https://doi.org/10.31949/j-ensitec.v12i02.18527Abstrak
PT XYZ is one of the largest two-wheeled automotive manufacturers that utilizes the plastic injection molding process to produce motorcycle body components, where the visual quality and dimensional stability of polymer-based exterior parts are critical to the final product aesthetics. The use of recycled material (regrind) from rejected products and runner systems via a crusher process often triggers melt viscosity fluctuations inside the heating barrel. This variation consequently induces physical defects such as sink marks, flash, and short shots on the plastic injection molding machines. This study aims to optimize the molding process parameters to minimize the defect rate of exterior body components using Response Surface Methodology (RSM) with a Central Composite Design (CCD) approach. Actual full-scale experiments were conducted on a 1300-Ton KraussMaffei two-platen machine equipped with Magnetic Clamping System technology, utilizing a material formulation blend of 75% Natural ABS, 5% Black Masterbatch, and 20% regrind. The optimized parameters include injection pressure, melt temperature, holding pressure, and cooling time. The response surface analysis revealed that the most optimal operating parameter combination was achieved at an injection pressure of 168 MPa, a melt temperature of 248°C, a holding pressure of 112 MPa, and a cooling time of 24 seconds. The implementation of these optimal settings on the actual production floor successfully reduced the total component defect rate significantly from an initial 4.20% down to 0.85%.
Kata Kunci:
Plastic Injection Molding , Process Optimization Regrind , Material, Design of Experiments , Automotive ComponentsUnduhan
Referensi
[1] Roeva, O. 2012. Real-World Applications of Genetic Algorithm. In International Conference on Chemical and Material Engineering (pp. 25– 30). Semarang, Indonesia: Department of
Chemical Engineering, Diponegoro University.
[2] Amiruddin, S. 2011. Studi Karakteristik Akuifer Dan Distribusi Airtanah Pada Formasi Walanae Studi Kasus Daerah Sengkang Kabupaten Wajo. Tesis. Universitas Hasanuddin.
[3] Gasper, D. Schramm, and M. Schöppner, "Influence of Mechanical Crusher Process on the Granulate Size Distribution and Thermal Degradation of Recycled Polypropylene," Journal of Polymer Engineering and Science, vol. 62, no. 4, pp. 1102–1111, 2022.
[4] Santoso, I. Setiawan, and H. Wijaya, "Optimasi Parameter Proses Injection Molding pada Pembuatan Komponen Otomotif Berbahan Polypropylene," Jurnal Teknik Mesin dan Manufaktur (JTMM), vol. 14, no. 2, pp. 78–86, 2023.
[5] K. Shay, M. S. Sulaiman, and A. R. Mohamed, "Optimization of Injection Molding Process Parameters for Reducing Shrinkage and Sink Marks in Plastic Parts Using Response Surface Methodology," International Journal of Advanced Manufacturing Technology, vol. 115, pp. 2451–2465, 2021.
[6] M. Bryce, Plastic Injection Molding: Manufacturing Process Fundamentals, 3rd ed. Dearborn, Michigan: Society of Manufacturing Engineers (SME), 2018.
[7] Fauzi and R. S. Ningrum, "Analisis Cacat Produk pada Komponen Sepeda Motor Berbahan Polimer Menggunakan Metode Failure Mode and Effects Analysis (FMEA) di Industri Otomotif," Jurnal Sistem Keandalan Manufaktur, vol. 9, no. 1, pp. 15–24, 2024.
[8] I. Setiawan, A. Fauzi, dan H. Wijaya, "Penerapan Metode Response Surface Methodology (RSM) dalam Penentuan Parameter Optimum Mesin Cetak Injeksi Plastik Tonase Besar," J-ENSITEC, vol. 10, no. 1, pp. 12–20, Mei 2024.
[9] Kanagaraj and P. S. Sivasubramanian, "Experimental Investigation and Optimization of Injection Molding Parameters of Regrind Polypropylene Blend Using Taguchi-RSM Approach," Materials and Manufacturing Processes, vol. 37, no. 8, pp. 912–923, 2023.
[10] Sukarnoto dan D. M. Prastowo, "Karakterisasi Degradasi Termal dan Efek Tegangan Geser Mekanis Mesin Crusher Granulator pada Polimer Acrylonitrile Butadiene Styrene (ABS)," J-ENSITEC, vol. 11, no. 1, pp. 74–82, Mei 2025.
[11] Rees, Understanding Injection Mold Design, 2nd ed. Munich: Hanser Publishers, 2020.
[12] M. R. Firdaus, T. Sukarnoto, and A. H. Setyawan, "Pengaruh Persentase Campuran Material Virgin dan Regrind Hasil Crusher terhadap Fluiditas dan Kekuatan Mekanik Komponen Cover Body Sepeda Motor," Jurnal Teknik Otomotif Indonesia, vol. 11, no. 3, pp. 142–151, 2024.
[13] R. Srinivasan and M. N. Balasubramanian, "Effect of Melt Temperature and Holding Pressure on Short Shot and Flash Defects in Plastic Injection Moulding," Journal of Mechanical and Materials Engineering, vol. 18, no. 2, pp. 89–98, 2021.
[14] M. S. Huang and Y. H. Lin, "Automated Parameter Tuning and Control Systems for Toyo Injection Molding Machines Under Dynamic Viscosity Changes," IEEE Transactions on Industrial Electronics, vol. 69, no. 5, pp. 4981–4990, 2022.
[15] H. Myers, D. C. Montgomery, and C. M. Anderson-Cook, Response Surface Methodology: Process and Product Optimization Using Designed Experiments, 4th ed. New York: John Wiley & Sons, 2016.
[16] S. Rao, "Application of Design of Experiments (DoE) for Minimizing Cycle Time and Defect Rate in Automotive Component Manufacturing Line," International Journal of Production Research, vol. 60, no. 14, pp. 4312–4327, 2022
[17] C. Chang and E. Faison, "Shrinkage Behavior and Warpage Analysis of Injection-Molded Thin-Walled Parts with Regrind Resins," Journal of Materials Processing Technology, vol. 291, p. 117025, 2021.
[18] W. S. Utomo and B. Purwanto, "Studi Kasus Efisiensi Biaya Produksi Komponen Plastik Melalui Manajemen Sirkulasi Runner dan Reject Material di PT Astra Honda Motor," Jurnal Manufaktur Industri Terintegrasi, vol. 7, no. 2, pp. 104–113, 2023.
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