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ITS » Undergraduate Theses » S1 - Teknik Mesin Lintas Jalur
Posted by aprill@is.its.ac.id at 12/02/2016 14:29:47  •  545 Views


STUDI SIMULASI DAN EKSPERIMEN PENGARUH KETEBALAN DINDING EXOTHERMIC RISER TERHADAP CACAT SHRINKAGE PADA PENGECORAN ALUMINIUM 6061 METODE SAND CASTING

SIMULATION AND EXPERIMENTAL STUDY THE EFFECT OF EXOTHERMIC RISER WALL THICKNESS AGAINST SHRINKAGE DEFECT ON ALUMINIUM 6061 CASTING WITH SAND CASTING METHODE

Author :
NORCAHYO, RACHMADI ( 2112 105 009 )




ABSTRAK

Kebutuhan akan aluminium 6061 yang berkualitas dan tanpa cacat baik dalam dunia industri otomotif dan penerbangan semakin meningkat. Hal ini disebabkan oleh sifat aluminium 6061 yang ringan murah dan mudah dibentuk baik secara pemesinan maupun pengecoran. Pada produk hasil pengecoran aluminium 6061 dengan cetakan pasir sering terjadi cacat salah satunya adalah cacat penyusutan shrinkage. Sistem saluran yang secara khusus menanggulangi shrinkage adalah penambah riser. Riser adalah bagian yang berfungsi untuk menambahkan logam cair pada rongga cetakan yang kekurangan logam cair pada saat proses solidifikasi dan riser diharapkan menjadi bagian terakhir yang membeku lebih lama dari produk cor. Untuk menjadikan riser menjadi bagian yang membeku paling akhir dapat menggunakan material exothermic untuk menyelimuti riser. Dengan exothermic riser logam cair dapat dijaga tetap pada kondisi cair yang lebih lama sehingga mampu mengisi logam cair ke dalam benda coran dengan lebih baik. Penelitian mengenai pengaruh tebal dinding exothermic riser terhadap cacat shrinkage ini dilakukan dengan metode simulasi dengan menggunakan software finite element terlebih dahulu kemudian dilakukan eksperimen pengecoran untuk mengetahui fenomena yang terjadi saat praktik pengecoran. Benda coran yang digunakan berbentuk kubus berukuran 75 mm 75 mm 75 mm dengan sistem saluran bottom-horizontal gating system. Untuk mengetahui pengaruh ketebalan dinding exothermic riser dalam menanggulangi cacat shrinkage riser biasa dengan bentuk silindris yang mempunyai diameter 49 mm dan tinggi 75 mm dibandingkan dengan exothermic riser dengan diameter yang sama. Dinding exothermic riser memiliki ketebalan mulai 5 mm dan ditambah setiap 2 mm hingga cacat shrinkage tidak terjadi lagi pada benda coran. Hasil penelitian menunjukkan bahwa seiring meningkatnya ketebalan dinding exothermic riser akan mempertahankan kondisi aluminium untuk cair lebih lama. Hal ini mengakibatkan logam cair mampu mengisi benda coran dengan lebih baik sehingga cacat shrinkage yang terjadi akan semakin kecil. Cacat shrinkage yang terbesar terletak pada riser dengan ketebalan dinding exothermic 5 mm dan yang tidak terjadi cacat shrinkage terletak pada ketebalan dinding exothermic 9 mm.


ABSTRACT

The need for quality and flawless aluminium 6061 both in the industrial automotive and aviation is increasing. This is due to the nature of the aluminium 6061 is lightweight inexpensive and easy to set up both machining and casting. In aluminium 6061 casting products with frequent sand mold defects one of which is shrinkage defect. Gating system that specifically to overcome the shrinkage is enhancer riser. Riser is the part that serves to add to the molten metal to mold cavity due to molten metal shortages during the process of solidification and riser is expected to be the last part to freeze longer than cast products. To make the riser into the final part of the frozen material can be used exothermic riser. With Exothermic riser liquid metal can be kept in a liquid state longer so as to fill the molten metal into the casting objects better. This Research study the effect of wall thickness of the exothermic riser shrinkage defects is conducted by simulation using finite element software and then carried out experiments to determine the casting phenomena that occur when casting practice. Objects castings used cuboid 75 mm 75 mm 75 mm with a horizontal bottom- gating system. To determine the effect of exothermic riser wall thickness in overcome shrinkage defects regular riser with a cylindrical shape having a diameter of 49 mm and height 75 mm compared to the exothermic riser with the same diameter. Exothermic riser wall has a thickness from 5 mm and 2 mm to plus until any defect shrinkage does not occur again in the body castings. The results showed that with increasing thickness of the walls of exothermic riser will maintain the condition of liquid aluminum for longer. This resulted in a liquid metal castings are able to fill objects with better so the shrinkage defects that occur will be smaller. Greatest shrinkage defect lies in the exothermic riser with wall thickness of 5 mm and are not defects shrinkage lies in the exothermic 9 mm wall thickness.



KeywordsAluminium 6061; exothermic riser; shrinkage
 
Subject:  Pendirian Aluminium; Deformasi (mekanik) paduan aluminium-metalografi
Contributor
  1. Indra Sidharta, ST., M.Sc
Date Create: 12/02/2016
Type: Text
Format: pdf
Language: Indonesian
Identifier: ITS-Undergraduate-21001150008228
Collection ID: 21001150008228
Call Number: RSM 673.722 2 Nor s


Source
Undergraduate Theses of Mechanical Engineering, RSM 673.722 2 Nor s, 2016

Coverage
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Rights
Copyright @2016 by ITS Library. This publication is protected by copyright and per obtained from the ITS Library prior to any prohibited reproduction, storage in a re transmission in any form or by any means, electronic, mechanical, photocopying, reco For information regarding permission(s), write to ITS Library




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  1.  ITS-Undergraduate-40031-2112105009-abstract_id.pdf - 291 KB
  2.  ITS-Undergraduate-40031-2112105009-abstract_en.pdf - 366 KB
  3.  ITS-Undergraduate-40031-2112105009-conclusion.pdf - 507 KB




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