Analisis Kegagalan Die pada Impact Extrusion Zinc-Can Process

Jilan, Ayunisa Fitriani (2018) Analisis Kegagalan Die pada Impact Extrusion Zinc-Can Process. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Die pada penelitian ini merupakan suatu komponen dalam proses manufaktur impact extrusion yang berfungsi sebagai cetakan untuk memperoleh bentuk zinc can. Die ditemukan patah setelah digunakan selama 14 hari dari waktu seharusnya 30 hari. Patahnya die menyebabkan produksi terhenti sementara sehingga mempengaruhi produktivitas. Oleh karena itu, perlu dilakukan analisis kegagalan pada die yang patah untuk menghindari terjadinya kegagalan serupa di kemudian hari. Analisis kegagalan dimulai dengan melakukan observasi awal mengenai fungsi dan cara kerja die serta studi literatur untuk mengumpulkan teori terkait analisis kegagalan. Bentuk dan profil permukaan patahan die diamati secara makroskopik menggunakan kamera digital dan stereo microscope untuk mengetahui profil patahan secara makro. Uji kekerasan dilakukan dengan menggunakan Rockwell hardness tester untuk mengetahui nilai kekerasan die pada potongan melintang dan permukaan atas die. Die diuji komposisi kimianya menggunakan spectrometer dan XRF (X-ray Fluorescence). Pengamatan mikroskopik dilakukan dengan metalografi dan SEM (Scanning Electron Microscope). Daerah crack initiation dilakukan uji EDS (Energy Dispersive X-Ray Spectroscopy) untuk mengetahui komposisi kimia di daerah tersebut. Dari penelitian pada die yang rusak, dihasilkan kesimpulan bahwa die mengalami patah low cycle fatigue fracture. Patah ini diakibatkan oleh beban yang besar sehingga menghasilkan daerah final fracture yang lebih luas dibandingkan daerah crack propagation. Kerusakan die disebabkan oleh proses operasi yang kurang benar. Blank yang tidak masuk sempurna kedalam lubang cetakan menyebabkan lubang mengalami tekanan berlebih pada satu sisi sehingga timbul crack initiation. Crack initiation yang terjadi lebih dahulu pada die patah 14 hari dibandingkan dengan die patah 30 hari menyebabkan die mengalami patah lebih awal dari umur yang seharusnya (30 hari). ==================================================================================================================== Die in this study is a component in the impact extrusion manufacturing process that serves as a mold to obtain the form of zinc can. Die was found to be broken after being used for 14 days from the time it should have been 30 days. The die break causes production to temporarily halt and thus affect productivity. Therefore, it is necessary to analyze failure on a broken die to avoid a similar failure in the future. The failure analysis begins with a preliminary observation of die functions and workings and literature studies to collect theories related to failure analysis. The shape and profile of the die fault surface were observed macroscopically using a digital camera and stereo microscope to determine the macro fracture profile. The hardness test was performed using a Rockwell hardness tester to determine the value of die hardness on the cross section and the top surface of the die. Chemical composition test using a spectrometer and XRF (X-ray Fluorescence). Microscopic observations were performed by metallography and SEM (Scanning Electron Microscope). The crack initiation area was tested by EDS (Energy Dispersive X-Ray Spectroscopy) to find out the chemical composition in the area. From the research on the broken die, it was concluded that the die broke the low cycle fatigue fracture. This fracture is caused by a large load resulting in a larger final area fracture than the crack propagation area. The die damage is caused by an improper operation process. Blank that did not enter perfect into the hole causing hole excessive pressure on one side so that crack initiation arise. This causes the die to break early. From the research on the broken die, it was concluded that the die had broke because low cycle fatigue fracture. This fracture is caused by a large load resulting in a larger final fracture area than the crack propagation area. The die damage is caused by an improper operation process. This caused the die broke early.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Analisis kegagalan, die, fatigue failure, impact extrusion, zinc can.
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User: Ayunisa Fitriani Jilan
Date Deposited: 19 Jun 2021 12:25
Last Modified: 19 Jun 2021 12:25
URI: https://repository.its.ac.id/id/eprint/57915

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