Abstract:Abstrak
Objektif. Getaran yang sering terjadi pada pengerjaan proses produksi menggunakan permesinan CNC milling merupakan hal yang sangat penting untuk diperhitungkan. Getaran ini dapat menyebabkan perubahan dimensi dan mempengaruhi tingkat kualitas benda kerja yang dihasilkan, sehingga efek getaran chatter atau self-excited vibration pada proses pengerjaan produksi menjadi masalah utama dalam proses permesinan milling. Nilai getaran chatter ditentukan menggunakan grafik SLD secara ekperimental untuk m… Show more
“…Tipe stainless steel austentic salah satunya yaitu stainless steel (SS) 304 yang didalamnya mengandung unsur kimia seperti Cr 18-20%, Mn ≤2%, P ≤0.045%, S ≤0.03%, Si ≤0.75, Ni 8-10.5%, dan C ≤0.03% yang ringan. Maka penggunaan material SS bisa dijumpai pada beberapa bagian pada airplane, aerospace yang digunakan pada bagian bushing, axis, valve, lugnuts [1] . Untuk memproses material ulet seperti SS harus menggunakan material pahat yang memiliki nilai kekerasan yang tinggi, tidak mengalami perubahan bahkan pada temperatur pemotongan yang tinggi, selain itu harus memiliki kecenderungan adhesi yang rendah, difusi yang sangat baik dan ketahanan aus abrasif [2] .…”
The manufacturing industry mostly uses CNC Milling machines in processing products that require high precision values. This machine is capable of a wide variety of feeding methods, inclinations, feed speeds, various tool styles, and much more. The purpose of this research is to analyze one method of infeed direction with the Zig-Zag effect by using 2 types of normal and variable tool types combined with variations in spindle speed and DOC to find out which variable is effective and produce a smoother comparison of surface roughness values. The type of material tested was SS 304 because this material has good advantages against corrosion. From the results of research conducted on this material for the use of a variable tool, it has an average roughness value of 0.327 µm and for the results of the roughness test on the use of a normal tool, it has an average roughness value of 0.470 µm. From the results of this research, it can be concluded that the value of the Depth Of Cut (DOC), the roughness value are directly proportional, and the faster the spindle rotation, the frictional force generated also increases. The highest Ra value from the research results occurred in DOC 1.6 mm with a spindle speed of 2750 rpm using a variable tool of 0.361 µm and a roughness value of 0.516 µm on a normal tool. The conclusion of this research is that the variable tool produces a lower Ra value than the normal tool so that the type of material defects caused by chatter vibration can be reduced.
“…Tipe stainless steel austentic salah satunya yaitu stainless steel (SS) 304 yang didalamnya mengandung unsur kimia seperti Cr 18-20%, Mn ≤2%, P ≤0.045%, S ≤0.03%, Si ≤0.75, Ni 8-10.5%, dan C ≤0.03% yang ringan. Maka penggunaan material SS bisa dijumpai pada beberapa bagian pada airplane, aerospace yang digunakan pada bagian bushing, axis, valve, lugnuts [1] . Untuk memproses material ulet seperti SS harus menggunakan material pahat yang memiliki nilai kekerasan yang tinggi, tidak mengalami perubahan bahkan pada temperatur pemotongan yang tinggi, selain itu harus memiliki kecenderungan adhesi yang rendah, difusi yang sangat baik dan ketahanan aus abrasif [2] .…”
The manufacturing industry mostly uses CNC Milling machines in processing products that require high precision values. This machine is capable of a wide variety of feeding methods, inclinations, feed speeds, various tool styles, and much more. The purpose of this research is to analyze one method of infeed direction with the Zig-Zag effect by using 2 types of normal and variable tool types combined with variations in spindle speed and DOC to find out which variable is effective and produce a smoother comparison of surface roughness values. The type of material tested was SS 304 because this material has good advantages against corrosion. From the results of research conducted on this material for the use of a variable tool, it has an average roughness value of 0.327 µm and for the results of the roughness test on the use of a normal tool, it has an average roughness value of 0.470 µm. From the results of this research, it can be concluded that the value of the Depth Of Cut (DOC), the roughness value are directly proportional, and the faster the spindle rotation, the frictional force generated also increases. The highest Ra value from the research results occurred in DOC 1.6 mm with a spindle speed of 2750 rpm using a variable tool of 0.361 µm and a roughness value of 0.516 µm on a normal tool. The conclusion of this research is that the variable tool produces a lower Ra value than the normal tool so that the type of material defects caused by chatter vibration can be reduced.
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