SIHOTANG, RINTO (2021) ANALISIS FAKTOR PENYEBAB DAN PERBAIKAN PRODUK CACAT HOT ROLLING PLATE DENGAN MENGGUNAKAN METODE DMAIC PADA INDUSTRI BAJA NASIONAL. S2 thesis, Universitas Mercu Buana Jakarta-Menteng.
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Abstract
Hot Rolling Mill adalah proses pembentukan logam di mana logam dilewatkan melalui satu pasang roll atau lebih untuk mengurangi ketebalan dan membuat ketebalan seragam dengan temperatur logam berada di atas temperature rekristalisasi. Dalam proses Hot rolling mill terdapat beberapa jenis cacat dan ditentukan cacat dominan seperti Ketebalan dibawah toleransi (Under gauge), Kesalahan pemotongan (Wrong cutting), gelombang sisi (Wavy edge) dan permukaan plat tidak rata (Out of flatness). Penelitian ini bertujuan untuk mengetahui faktor penyebab utama terjadinya produk cacat dan melakukan perbaikan untuk meminimalisir produk cacat tersebut. Metode yang digunakan dalam penelitian ini adalah penerapan Six Sigma dengan tahapan metode DMAIC (Define, Measure, Analyze, Improve, Control). Dari hasil analisis data produk cacat ditemukan faktor penyebab utama terjadinya cacat yaitu Rolling mill, pengecekan komponen yang tidak rutin, dan Prosedur kerja yang tidak diterapkan. Kemudian melakukan Perbaikan (Improvement) dengan menggunakan Design of Experiment (DOE). Dari hasil percobaan diperoleh kombinasi terbaik dalam melakukan perbaikan untuk mengurangi produk cacat. Setelah melakukan perbaikan dan mengambil data kembali maka diperoleh hasil produk cacat berkurang dari 2,95 % menjadi 0,60%, hasil DPMO (Defects per Million Opportunity) dari 7377 menjadi 1509 dan level Sigma meningkat dari 3,94 menjadi 4,47. Perbaikan yang dilakukan terbukti dapat mengurangi tingkat kecacatan dan proporsi produk cacat terkendali dengan baik. ===Hot rolling is a metalworking process in which metal is heated above the recrystallization temperature to plastically deform it in the working or rolling operation. The hot metal is passed between two rolls to flatten it, lengthen it, reduce the cross-sectional area and obtain a uniform thickness. In the hot rolling mill process there are several types of defects and the dominant defects are determined such as under gauge, wrong cutting, wavy edge and out of flatness. This study aims to determine the main causes of defective products and make improvements to minimize these defective products. The method used in this research is the implementation of Six Sigma with the DMAIC method (Define, Measure, Analyze, Improve, Control). From the results of the analysis of defective product data, it was found that the main factors causing defects were Rolling mill, checking components that were not routine, and work procedures that were not applied. Then make improvements using the Design of Experiment (DOE). From the results of the Design of Experiment (DOE) experiment, the best combination was obtained in making improvements to reduce defective products. After making repairs and retrieving the data, the results of defective products were reduced from 2.95% to 0.60%, the results of DPMO (Defects per Million Opportunity) from 7377 to 1509 and the Sigma level increased from 3.94 to 4.47. The improvements made are proven to be able to reduce the level of defects and the proportion of defective products is well controlled.
| Item Type: | Thesis (S2) |
|---|---|
| NIM/NIDN Creators: | 55318120013 |
| Uncontrolled Keywords: | Six Sigma, DMAIC, DOE, Defect, DPMO, Quality, |
| Subjects: | 600 Technology/Teknologi > 670 Manufacturing/Manufaktur, Pabrik-pabrik |
| Divisions: | Pascasarjana > Magister Teknik Industri |
| Depositing User: | Priyo Raharjo |
| Date Deposited: | 16 Feb 2022 06:39 |
| Last Modified: | 03 Jul 2024 07:34 |
| URI: | http://repository.mercubuana.ac.id/id/eprint/56192 |
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