Nandiwardhana, Hanggara (2020) Rancang Bangun Dies Set Pembentukan Necking Selongsong Peluru Kaliber 20mm. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Senjata api menembakan atau meluncurkan sebuah proyektil padat berupa peluru. Peluru memiliki beberapa bagian antara lain selongsong (case) yang berfungsi sebagai tempat menyatukan proyektil padat (bullet), alat pemacar percikan api (primer), dan mesiu (powder). Proses pembuatan selongsong peluru diawali dengan pemotongan pelat melalui proses blanking atau piercing. Kemudian dilanjutkan dengan proses deep drawing yaitu proses membentuk lembaran pelat yang telah dipotong dan menjadi cup. Setelah terbentuk cup dilakukan proses ironing untuk membentuk cup menjadi selongsong dengan ketebalan serta ketinggian yang diinginkan. Selanjutnya dilakukan pembentukan necking pada selongsong peluru.
Untuk membuat necking terdapat dua tahapan yang bisa dilakukan yaitu menggunakan metal spinning ataupun dengan mesin press tool. Dalam penelitian kali ini metode yang digunakan adalah menggunakan mesin press tool. Adapun proses pembuatan dies set necking selongsong peluru kaliber 20mm dengan beberapa tahapan. Hasil pengukuran didapatkan selongsong dari proses ironing tahap 4 oleh Bhaskara 2018 dengan diameter luar sebesar 33,88 mm, diameter dalam 31,24 mm, dan tinggi selongsong sebesar 115,61 mm. Tahapan selanjutnya adalah perancangan dies dimana rancangan ini di disain untuk mesin Press tool yang ada di jurusan Teknik Mesin ITS, dari hasil perhitungan dimensi dies necking yang telah dilakukan dari ukuran dan dimensi mulai dalam merancang bentuk yang sesuai.
Merancang komponen dies set untuk pembentukan necking selongsong peluru kaliber 20mm dimana penentuan dimensi dies necking dalam perhitungan manual didapatkan nilai ketinggian bukaan dies H = 17,17 mm, tebal dies e = 14,236 mm, dan diameter bukaan dies Ø = 22,73 mm. Dilakukan pengujian dies set dalam pembentukan necking dengan menggunakan mesin press tool dilakukan 10X, dimana menggunakan selongsong berbahan stainless steel didapatkan hasil sebagai berikut diameter luar selongsong pada necking mean µ = 24,9416mm, dan diameter dalam selongsong pada necking mean µ = 22,2816mm. Dapat disimpulkan dies necking berhasil melakukan pembentukan necking menggunakan mesin press tool.
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The firearm fires or launches a solid projectile bullet. Bullets have several parts, including a case that serves as a place to unite a solid projectile (bullet), a spark (primary), and gunpowder (powder). The manufacturing process begins with cutting the plate through a blanking or piercing process. Then with the deep drawing process, namely the process of forming plate sheets that have been cut and become cups. After the cup is formed, the ironing process is carried out to form the cup into a sleeve with the desired thickness and height. Furthermore, the necking order was made on the cartridge casings.
To make necking, two steps can be done using metal spinning or using a press tool. In this research, the method used is to use a press tool machine. The process of making 20mm caliber cartridge necking dies set with several stages. The measurement results obtained from the ironing process stage 4 by Bhaskara 2018 with an outer diameter of 33.88 mm, an inner diameter of 31.24 mm, and a sleeve height of 115.61 mm. The next stage is the design of dies where this design is designed for the Press tool machine in the Department of Mechanical Engineering ITS, from the calculation of the dimensions of the dies necking that has been carried out from the size and dimensions starting in the appropriate forum.
Designing dies components for making necking of 20mm caliber bullet cartridges where the dimensions of dies necking in manual calculations get the value of the die opening height H = 17.17 mm, dies thickness e = 14,236 mm, and dies opening diameter Ø = 22.73 mm. Dies set testers were carried out to order necking using a press tool machine carried out 10X, where using a stainless steel sleeve the following results were obtained, the outer diameter of the sleeve at the necking mean µ = 24.9416mm, and the inner diameter of the sleeve on the necking mean µ = 22.2816mm. It can be abbreviated as dies necking, successfully placing an order using the press tool machine.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Necking, Ironing, Press Tool, Dies Set, Bullet |
| Subjects: | T Technology > TS Manufactures > TS176 Manufacturing engineering. Process engineering (Including manufacturing planning, production planning) |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Hanggara Nandiwardhana |
| Date Deposited: | 26 Aug 2020 13:36 |
| Last Modified: | 26 Oct 2023 03:56 |
| URI: | http://repository.its.ac.id/id/eprint/81377 |
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