?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=ANALISA+NILAI+KEKASARAN+PERMUKAAN+MAGNESIUM%0D%0A%0D%0AAZ31+YANG+DIBUBUT+MENGGUNAKAN+PAHAT+PUTAR+DAN+UDARA+DINGIN%0D%0A&rft.creator=BAGUS+PURNOMO+%2C+1215021021&rft.subject=Mesin+(General).+Mesin+Sipil+(General)&rft.description=%0D%0A%0D%0A%0D%0A%C2%AC%0D%0A%0D%0A%0D%0A%0D%0AABSTRAK%0D%0A%0D%0A%0D%0A%0D%0A%0D%0AMagnesium+merupakan+logam+ringan+yang+banyak+digunakan+sebagai+bahan+alternatif+pengganti+besi+dan+baja.+Magnesium+telah+diaplikasikan+di+industri+otomotif+untuk+menurunkan+berat+suatu+komponen%2C+akan+tetapi+proses+pemesinan+magnesium+memiliki+kekurangan+yaitu+sangat+mudah+terbakar+karena+memiliki+titik+nyala+yang+rendah.+Suhu+pemotongan+yang+tinggi+dapat+menyebabkan+keausan+pahat+dan+berkontribusi+terhadap+kualitas+kekasaran+permukaan.+Tujuan+dari+penelitian+ini+adalah+mendapatkan+nilai+kekasaran+permukaan+dan+mengimplementasikan+metode+pahat+potong+berputar+(rotary+tool)+dan+udara+pendingin+(air+cooling)+keluaran+vortex+tube+cooler+untuk+meminimumkan+nilai+kekasaran+permukaan.+Parameter+pemesinan+bubut+menggunakan+pahat+putar+pada+kondisi+kecepatan+benda+kerja+(Vw)+50%2C+120%2C+160+m%2Fmin%2C+kecepatan+potong+pahat+putar+(Vt)+25%2C+50%2C+75+m%2Fmin%2C+gerak+makan+(f)+0.1%2C+0.15%2C+0.2+mm%2Frev%2C++dan+kedalaman+potong+0.3+mm.+Jenis+pahat+yang+digunakan+adalah+pahat+karbida+berdiameter+16+mm+dan+udara+dingin+bertekanan+6+bar.+Hasil+pengujian+menunjukkan+nilai+rata-rata+kekasaran+permukaan+terendah+pada+kecepatan+benda+kerja+80+m%2Fmin%2C+kecepatan+potong+pahat+putar+50+m%2Fmin%2C+gerak+makan+0.2+mm%2Frev%2C+dan+kedalaman+potong+0.3+mm.+Sedangkan+nilai+rata-rata+kekasaran+permukaan+tertinggi+pada+kecepatan+benda+kerja+160+m%2Fmin%2C+kecepatan+potong+pahat+putar+50+m%2Fmin%2C+gerak+makan+0.2+mm%2Frev%2C+dan+kedalaman+potong+0.3+mm.+Pengaruh+parameter+pemesinan+menyimpulkan+semakin+tinggi+kecepatan+benda+kerja+maka+nilai+kekasaran+permukaan+semakin+tinggi.+Sebaliknya+semakin+tinggi+kecepatan+potong+pahat+putar+maka+nilai+kekasaran+permukaan+semakin+rendah.+Hasil+pengamatan+pada+permukaan+pada+pahat+putar%2C+ditemukan+keausan+pahat+yang+tidak+seragam+yang+menyebabkan+kekasaran+permukaan+yang+tidak+seragam.+Penggunaan+pahat+putar+berkontribusi+untuk+menurunkan+nilai+kekasaran+permukaan+yang+dihasilkan.%0D%0A%0D%0AKata+Kunci+%3A+Magnesium+AZ31%2C+pemesinan%2C+pahat+putar%2C+udara+dingin%2C++kekasaran+permukaan.%0D%0A%0D%0A%0D%0A%0D%0AMagnesium+is+a+lightweight+metal+that+is+widely+used+as+an+alternative+to+iron+and+steel.+Magnesium+has+been+applied+in+the+automotive+industry+to+reduce+the+weight+of+a+component%2C+but+the+machining+process+has+the+disadvantage+that+magnesium+is+highly+flammable+because+it+has+a+low+flash+point.+High+temperature+can+cause+the+cutting+tool+wear+and+contributes+to+the+quality+of+the+surface+roughness.+The+purpose+of+this+study+is+to+obtain+the+value+of+surface+roughness+and+implement+methods+of+rotary+cutting+tool+and+air+cooling+output+vortex+tube+cooler+to+minimize+the+surface+roughness+values.+Machining+parameters+that+is+turning+using+rotary+cutting+tool+at+speed+the+workpiece+of+(Vw)+50%2C+120%2C+160+m%2Fmin%2C+cutting+speed+of+rotary+tool+of+(Vt)+25%2C+50%2C+75+m%2Fmin%2C+feed+rate+of+(f)+0.1%2C+0.15%2C+0.2+mm%2Frev%2C+and+depth+of+cut+of+0.3+mm.+Type+of+tool+used+is+a+carbide+tool+diameter+of+16+mm+and+air+cooling+pressure+of+6+bar.+The+results+show+the+average+value+of+the+lowest+surface+roughness+on+the+workpiece+speed+of+80+m%2Fmin%2C+cutting+speed+of+rotary+tool+of+50+m%2Fmin%2C+feed+rate+of+0.2+mm%2Frev%2C+and+depth+of+cut+of+0.3+mm.+While+the+average+value+of+the+highest+surface+roughness+on+the+workpiece+speed+of+160+m%2Fmin%2C+cutting+speed+of+rotary+tool+of+50+m%2Fmin%2C+feed+rate+of+0.2+mm%2Frev%2C+and+depth+of+cut+of+0.3+mm.+The+influence+of+machining+parameters+concluded+the+higher+the+speed+of+the+workpiece+the+surface+roughness+value+higher.+Otherwisw+the+higher+cutting+speed+of+rotary+tool+then+the+lower+the+surface+roughness+value.+The+observation+on+the+surface+of+the+rotary+tool%2C+it+was+found+that+no+uniform+tool+wear+which+causes+non-uniform+surface+roughness.+The+use+of+rotary+cutting+tool+contributing+to+lower+surface+roughness+values+generated.%0D%0A%0D%0AKeywords%3A+Magnesium+AZ31%2C+machining%2C+rotary+tool%2C+air+cooling%2C+surface+%0D%0A+roughness.%0D%0A%0D%0A%0D%0A&rft.publisher=FAKULTAS++TEKNIK&rft.date=2017-07-25&rft.type=Skripsi&rft.type=NonPeerReviewed&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F27869%2F1%2FABSTRAK.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F27869%2F2%2FSKRIPSI%2520TANPA%2520BAB%2520PEMBAHASAN.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F27869%2F3%2FSKRIPSI%2520FULL.pdf&rft.identifier=++BAGUS+PURNOMO+%2C+1215021021++(2017)+ANALISA+NILAI+KEKASARAN+PERMUKAAN+MAGNESIUM+AZ31+YANG+DIBUBUT+MENGGUNAKAN+PAHAT+PUTAR+DAN+UDARA+DINGIN.++FAKULTAS+TEKNIK%2C+UNIVERSITAS+LAMPUNG.+++++&rft.relation=http%3A%2F%2Fdigilib.unila.ac.id%2F27869%2F