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All Journal Rotasi Sinergi Jurnal Teknik Mesin International Journal of Advanced Technology in Mechanical, Mechatronics and Material (IJATEC) Akuntansi dan Humaniora: Jurnal Pengabdian Masyarakat Jurnal Pengabdian Masyarakat Bhinneka Kohesi: Jurnal Sains dan Teknologi
Swandya Eka Pratiwi
Universitas Mercu Buana
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences Other

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Journal : Sinergi

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ANALISA FAKTOR PENYEBAB KEGAGALAN MESIN GRINDER PADA PROSES PRODUKSI PLASTIC FILM DI PT. MUTIARA HEXAGON Imam Hidayat; Swandya Eka Pratiwi
SINERGI Vol 17, No 3 (2013)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (407.711 KB)

Abstract

Bila suatu mesin memiliki tingkat kegagalan yang tinggi, maka perlu dilakukan analisis mengenai  penyebab  –  penyebab  kegagalan  tersebut  hingga  ke  akar  permasalahannya sehingga dapat menentukan tindakan yang sesuai untuk meningkatkan kinerja suatu mesin. PT. Mutiara Hexagon merupakan sebuah perusahaan yang bergerak dibidang industri pembuatan plastik  kemasan.  Dalam  line  pembuatan lembaran film  diperlukan mesin  CPP  (Cast  Poly Propylene Machine) dan mesin grinder dalam prosesnya. Pada penelitian yang dilakukan di PT. Mutiara Hexagon, terdapat beberapa kegagalan yang terjadi pada mesin grinder pada proses produksi plastic film, sehingga menyebabkan seluruh line pada divisi film mengalami downtime. Tujuan dari penelitian ini adalah untuk melakukan analisa mengenai faktor penyebab kegagalan mesin grinder, penulis melakukan observasi secara langsung dan melihat proses produksi plastic film.Penulis menggunakan metode Failure Effect and Mode Analysis (FMEA) dan Fault Tree Analysis (FTA). Penerapan analisis Failure Effect and  Mode Analysis (FMEA) dapat menentukan sejauh mana tingkat kegagalan terjadi. Dari hasil analisis FMEA kemudian dapat dilanjutkan dengan menggunakan Fault Tree Analysis (FTA) guna mengetahui lebih lanjut penyebab-penyebab dasar suatu kegagalan.Dari hasil perhitungan nilai Risk Priority Number (RPN) pada tiap-tiap kegagalan yang terjadi  diantaranya yang  paling  tinggi  adalah kegagalan mesin  grinder rusak  dengan nilai kegagalannya mencapai 120. Kemudian dianalisa penyebab kegagalan tersebut dengan menggunakan metode FTA di dapatkan minimal cut sets yaitu: as grinder patah, katup hisap blower terbuka terlalu besar, kegagalan pada motor blower, baut pada dudukan pisau patah, pisau tumpul dan human error. Berdasarkan nilai probabilitas masing-masing cut set didapatkan nilai probabilitas kegagalan grinder periode 1 Juni 2012 -1 Juni 2013 mencapai 60%.
The influence of heat rate and austenitization temperature on microstructure and hardness of Hadfield steel Haris Wahyudi; Swandya Eka Pratiwi; Adolf Asih Supriyanto; Daisman Purnomo Bayyu Aji
SINERGI Vol 27, No 2 (2023)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2023.2.012

Abstract

The As-Cast condition of Hadfield alloy usually contains (Fe, Mn)3C carbides around the austenitic grains, which promote brittleness, making the steel impractical in industry. Heat treatment is normally applied to reduce carbide content, lower carbides, and improve toughness. However, a complete austenitic structure is not attainable during solution treatment. The dissolution temperature and dissolution time are critical to obtaining complete carbide content. Furthermore, heating must be done slowly, and the quenching speed must be fast enough. This study examines the effect of heat rate and austenitization temperatures in the solution treatment on the microstructure and hardness of Hadfield steel. The heat rate of 3, 6 and 10 oC/min is selected to determine whether there is a change in the microstructure of Hadfield steel. The four austenitization temperatures of 1000, 1100, 1150 and 1200 oC are used to ascertain carbide dissolution into the austenite matrix. Grain boundary, hardness, and phase transformation will confirm the microstructural change and hardness properties. The optical microscope shows carbide content is reduced as the austenitization temperature increases. The consequence of carbide dissolution affects the hardness. Its hardness decreases as temperature increase due to the loss of carbide. The as-Cast specimen has the highest hardness of 227.8 HV30, and the lowest hardness is 176.7 HV30 belongs to a specimen that is heated up to 1200 °C and quenched into water. Grain size is measured by the line intercept method, which shows its increase as temperatures increase. The result of grain measurement is as follows: As-Cast 224.6 mm, T 1000 °C 323.3 mm, T1100 °C 409.2 mm, T1150 °C 1014.4 mm, T1200 °C 881.6 mm. SEM-EDS confirms that the main phase is austenite, and a small amount of carbide is detected in the austenite matrix. 
Co-Authors A.A. Ketut Agung Cahyawan W Aan Budi Setiawan Adolf Asih Supriyanto ALAMSYAH, Rasyid Andi Firdaus Sudarma Anggara, Fajar Daisman Purnomo Bayyu Aji Ezra Esa Jaya Haris Wahyudi Henry Carles Irwan Firdaus Jaya, Ezra Esa Malau, Jefri Lamhot Nur Indah, Nur Riaty Handayani Sagir Alva Salsabila, Unik Hanifah Sari, Andarany Kartka SETYAWATI, Hari Subekti Subekti Wahyudi, Haris Wicaksono, Aryo Wiwit Suprihatiningsih