Analisa Kegagalan Baut Joint Riding Gear pada Mesin Granulator (Studi Kasus PT. Petrokimia Gresik)

Mustaqim, Achmad Rizal (2017) Analisa Kegagalan Baut Joint Riding Gear pada Mesin Granulator (Studi Kasus PT. Petrokimia Gresik). Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Komponen mesin Granulator di PT.Petrokimia Gresik sering mengalami kegagalan. Mesin ini digerakkan oleh motor yang mentransmisikan dayanya lewat riding gear dan pinion untuk memutar drum granulator. Riding gear terdiri dari dua bagian setengah lingkaran yaitu komponen gear bagian atas dan bagian bawah. Berdasarkan sejarah kerusakan setahun terakhir, baut penyambung riding gear ini patah tiap 2-7 hari sekali. Pada tugas akhir ini akan dilakukan tahapan-tahapan pemecahan masalah untuk menganalisa penyebab kerusakan pada baut joint riding gear pada mesin granulator di PT. Petrokimia Gresik. Penyelesaian masalah dimulai dengan studi lapangan, kemudian pengumpulan data-data yang mendukung, studi literatur dan investigasi failure analysis. Setelah itu dilakukan analisa perhitungan gaya dan torsi yang kemudian menjadi input pada simulasi mengunakan software Finite Element Analysis (FEA). Dari hasil analisa kegagalan dengan menggunakan FEA, nilai tegangan maksimum terletak pada leher baut sebesar 15,468 MPa. Angka ini berada jauh di bawah kekuatan yiled material yaitu 550 MPa. Baut patah fatigue pada bagian leher karena adanya konsentrasi tegangan pada leher baut, rough surface finish dan adanya pretension karena pengencangan baut yang terlalu rapat dan tidak sesuai standar. Oleh karena itu solusi yang ditawarkan adalah me-redesign ring washer, memperhalus hasil proses machining pada saat pembuatan baut, mengganti semua baut pada saat ada yang patah dan memasang baut menggunakan torque wrench sesuai standar. ================================================================= Granulator’s component in PT.Petrokimia Gresik has been found to have a failure. This machine is powered by a motor that transmits the power through a riding gear and pinion to rotate the granulator’s shell. The riding gear is constructed by two-half parts of gear and fastened by bolts. Based on the latest year’s history, the bolts are found to fail in every 2-7 days. This final project is intended to analyze the cause of the failure of the bolted joint on this riding gear. The study was preceded by doing a field study, collecting data, doing a literature study and investigating the failure analysis. The force and torque is then counted to be the input in a simulation using Finite Element Analysis (FEA) software. Based on the result of the simulation, the maximum stress is found on the neck of the bolt with a number of 15.468 MPa. This number is way lower compared to the yield strength of material which is 550 MPa. The fatigue crack happened on the bolt is caused by the stress concentration on Its neck, rough surface finish, and there is a pretension due to failed setting procedure. That is why a redesign of ring washer on the bolt neck is made to reduce the stress concentration. On the other side, the machining process when making the bolt should be done smoothly. It is also necessary to change all bolts with the new one when there is a bolt that fails. Moreover, It is also wisely suggested to use a torque wrench with the procedure when fastening the bolts.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Granulator, Riding Gear, Baut, Analisis, Kegagalan, Failure
Subjects: Q Science > QA Mathematics > QA278.5 Principal components analysis. Factor analysis.
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Industrial Technology > Mechanical Engineering > (S1) Undergraduate Theses
Depositing User: Achmad Rizal Mustaqim
Date Deposited: 31 Oct 2017 04:14
Last Modified: 08 Mar 2019 03:32
URI: http://repository.its.ac.id/id/eprint/45588

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