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ITS » Undergraduate Theses » Teknik Mesin
Posted by zamrud@its.ac.id at 08/06/2010 15:06:57  •  2134 Views


PENGARUH KECEPATAN POTONG TERHADAP TERJADINYA CHATTER PADA PROSES BUBUT DENGAN PENCEKAMAN TANPA TAILSTOCK

THE INFLUENCE OF CUTTING SPEED TO THE OCCURED OF eRATTER ON OVERHANG TURNING PROCESS

Author :
Rachman, Ahmad Paizar ( 2101109603 )




ABSTRAK

Pada proses bubut terutama pembubutan dengan mesin konvensional ada beberapa cara untuk mencapai produktivitas yang tinggi antara lain meningkatkan kecepatan potong meningkatkan gerak makan feeding atau memperbesar tebal geram menaikan kedalaman pemakanan. Tapi untuk mencapai produktivitas yang tinggi ada suatu hal yang perlu diperhatikan yaitu tebal geram tidak dapat diperbesar secara leluasa karena apabila tebal geram mencapai batas kestabilannya bum pemotongan tersebut akan bergetar pada daerah frekuensi pribadinya chatter sehingga menurunkan kualitas produk yang dihasilkan antara lain kekasaran permukaan. Batas kestabilan ini berbeda untuk masing-masing kasus jenis mesin sistem pencekaman atau kondisi pemotongan. Dalam tugas akhir ini dikaji pengaruh kecepatan potong Vc terhadap terjadinya chatter yaitu berupa batas kestabilan blim dan kekasaran permukaan yang dihasilkan pada pembubutan bendakerja dengan pencekaman tanpa penumpu tailstock. Variasi kecepatan potong didapat dari variasi putaran spindel utama yang digunakan dan diameter akhir bendakerja pada saat chatter. Dari eksperimen pemotongan didapatkan kondisi kritis pemotongan berupa bum untuk masingmasing kecepatan potong ditandai dengan peningkatan amplitudo getaran yang drastis dan suara bising yang berlebihan mendengung. Saat pemotongan dengan n 155 rpm pada kondisi stabil peningkatan lebar geram dari 1.04 4.14 mm tidak terlalu mempengaruhi amplitudo getaran yang terjadi pada saat lebar geram memasuki 4.35 mm ammplitudo getaran meningkat drastis hampir 4 kali lipat pada frekuensi 125 Hz. Untuk variasi kecepatan potong dari 17.43 52.53 mlmin terjadi penurunan bu dari 4.35 - 2.07 mm. Dari penelitian ini didapatkan hubungan antara kecepatan potong Vc dengan batas kestabilan bum dan hubungan antara kecepatan potong Vc dengan kekasaran permukaan saat terjadi chatter dan amplitudo getaran A yang dinyatakan dengan persamaan b - 0.6903 lim 30.043 Vc mm Ra 15.14. Vc -0.136 A02 47 um Rq 15.14. V c -0.107 A02 50 um Rz 47.86. Vc -0.104 A0325 R 42.66. Vc -0.019 Aom


ABSTRACT

At turning process especially with conventional turning machine there are some way to reach the high productivity for example by improving cutting speed Vc improving feeding f or enlarge chips width b by enlarge cutting deepness a. But to reach the high productivity there is a matter which require to be paid attention that the chips width cannot be enlarged freely because if its reach the its stability boundary bliJ cutting process will vibrate at its natural frequency area chatter so that degrade the product quality for example surface roughness. This Stability boundary differ to each case machine type clamping system or cutting condition. In this final project its studied the influence ofcutting speed Vc to the occurred ofchatter that is in the form ofstability boundary bliJ and the surface roughness that be yielded at overhang turning process. Variation ofcutting speed be got from variation of lead spindel rotation that be used and final diameter of workpiece when chatter occurs. From the cutting test its got a critical condition ofcutting process in the form ofbliJ to each cutting speed its marked with the make-up of drastic vibration amplitude and abundant clunk whizzing. At the moment when cutting uses n 155 rpm at stable condition the improvement of chips width from 1.04 - 4.14 mm do not too influencing to vibration amplitude that be happened at the time ofchips width to enter 4.35 mm ammplitudo vibration mount drastic almost 4 times fold at frequency 125 Hz. For the variation of cutting speedfrom 17.43 - 52.53 mmin the degradation bu occur from 4.35 - 2.07 mm. From this research Its got the relation between cutting speed Vc with the stability boundary bliJ and the relation between cutting speed Vc with the surface roughness of workpiece when chatter occurs and the amplitude of vibration A that be expressed with equation b. 30.043 V -0.6903 .1 R 47 86. V --.104 AO.325 hm c mm z c Ra 15.14.Vc - 0136 A 0247 um R 42.66.Vc --019 .A0352 R 1514.V--107 .A02 50 .1 q c



Keywords"chatter, overhang turning precess, r naturalfrequency, surface roughness
 
Subject:  Mesin bubut
Contributor
  1. Dr. Ing. Ir. Suhardjono. MSc.
Date Create: 08/06/2010
Type: Text
Format: pdf
Language: Indonesian
Identifier: ITS-Undergraduate-3100004021026
Collection ID: 3100004021026
Call Number: RSM 621.942 Rac p


Source
Undergraduate Theses of Mechanical Engineering of Departemen of Industrial Technology Faculty, RSM 621.942 Rac p, 2004

Coverage
ITS Community

Rights
Copyright @2004 by ITS Library. This publication is protected by copyright and permission should be obtained from the ITS Library prior to any prohibited reproduction, storage in a retrievel system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to ITS Library




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  1.  ITS-Undergraduate-11189-2101109603-Abstract_in.pdf - 52 KB
  2.  ITS-Undergraduate-11189-2101109603-Abstract_en.pdf - 46 KB
  3.  ITS-Undergraduate-11189-2101109603-Conclusion.pdf - 58 KB




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