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ITS » Master Theses » Sistem Manufaktur - S2 Posted by dee@its.ac.id at 12/01/2012 10:06:26 • 122 Views
PENGARUH SUDUT ORIENTASI ANTARA PAHAT DAN BENDA KERJA TERHADAP BATAS STABILITAS CHATTER PADA PROSES BUBUT ARAH PUTARAN SPINDLE COUNTER CLOCKWISE
INFLUENCE OF ORIENTATION ANGEL BETWEEN TOOL AND WORKPIECE TO LIMIT STABILITY OF CHATTER ON TURNING PROCESS FOR COUNTER CLOCKWISE ROTATION OF SPINDLE DIRECTION
Created by :
SUSANTO, AGUS ( 2109201008 )
| Subject: | Mesin bubut | | Alt. Subject : | Lathes | | Keyword: | Orientation angel Turning process Counter clockwise Chatter stability |
[ Description ]
Chatter merupakan getaran eksitasi diri, dimana amplitudo getaran tidak lagi linier terhadap kenaikan kedalaman potong, melainkan amplitudo naik secara eksponensial pada saat proses pemesinan. Chatter memberikan efek negatip pada akurasi dimensi, kualitas permukaan, mempercepat keausan pahat, bahkan pahat terjadi patah dini, dan menurunkan efisiensi operasi pemotongan. Chatter harus dihindari, diantaranya dengan meningkatkan stabilitas mesin perkakas atau mengetahui batas stabilitas proses pemotongan. Penelitian yang dilakukan dengan menggunakan alat bantu berupa tool post dan tool positioning, sehingga sudut orientasi antara pahat dan benda kerja dapat divariasikan, yaitu 0˚ hingga 180˚ dengan step 15˚. Proses bubut dilakukan pada arah putaran benda kerja counter clockwise dilihat dari head stock. Benda kerja yang digunakan adalah Mild Steel ST 41 dengan Ø 38.1 mm, panjang bebas pencekaman 150 mm, dan panjang pencekaman 50 mm. Pahat yang digunakan HSS dengan sudut potong utama (κr) 45˚. Eksperimen diawali dengan uji eksitasi untuk mengetahui frekuensi pribadi benda kerja dan uji pemotongan untuk mengetahui pengaruh kedalaman potong terhadap batas stabilitas chatter. Hasil penelitian menunjukkan bahwa terdapat perubahan yang signifikan pada stabilitas chatter, frekuensi chatter, dan kedalaman pemotongan setiap sudut orientasi, dimana stabilitas tertinggi terdapat pada sudut orientasi 30o sebesar alimit 4.25 mm dan terendah pada 150o sebesar 0.2 mm jadi terjadi peningkatan stabilitas sebesar 21 kali, serta perubahan sudut orientasi proses bubut dari proses bubut normal (konvensional) menjadi 30o dapat meningkatkan stabilitas pemotongan sebesar 4.25 kali.
Alt. Description
Chatter is self-excitation vibration, where does vibration amplitude not again linear to increase depth of cut, but amplitude rises according to exponential at the (time) of machining process. Chatter give negative effect in dimension accuracy, surface quality, tool wear, even tool can broken early, and decreased of machining operation efficiency. Chatter must be avoided, with increase machine tool stability or detect stability limit of machining process. Design experiment is done by using tool post and tool positioning, so that angel of between tool and workpiece can variation, that is 0˚ hingga 180˚ with step 15˚. Turning process done counter clockwise rotation of direction view from head stock. Workpiece that used Mild steel ST 41, with Ø 38.1 mm, free long of chucked is 150 mm and long chucked is 50 mm. Tool used is HSS with principal cutting edge angle (κr) 45˚ . Experiment is started with excitation test to detect natural frequency of workpiece and cutting test to detect influence depth of cuts to limit stability of chatter. From result of study showed that found difference stability of chatter, frequency chatter, and depth of cut every orientation angle, where does, highest stability found in orientation angle 30o as big as is 4.25 mm and bottommost in 150o as big as is 0.2 mm so to happen stability enhanced as big as 21 times, with process orientation corner change turning from process normal turning be 30o can increase cutting stability as big as 4.25 time.
| Contributor | : |
- Prof. Dr.-Ing. Ir. Suhardjono, M.Sc
| | Date Create | : | 28/07/2011 | | Type | : | Text | | Format | : | pdf | | Language | : | Indonesian | | Identifier | : | ITS-Master-3100011045207 | | Collection ID | : | 3100011045207 | | Call Number | : | RTM 621.942 Sus p |
Source : Master Thesis of Mechanical Engineering, RTM 621.942 Sus p, 2011
Coverage : ITS Community
Rights : Copyright @2011 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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