Aluminium paduan Al-Mg-Si khususnya T6061 merupakan paduan yang pada umumnya diaplikasikan untuk otomotif dan alat-alat konstruksi. Penelitian ini diarahkan untuk peningkatan sifat mekanis khususnya kekerasan material T6061 untuk diaplikasikan sebagai selongsong peluru. Selama ini material untuk selongsong peluru banyak menggunakan kuningan yang mempunyai density yang lebih besar daripada aluminium padahal sebagai selongsong peluru diperlukan material yang ringan tetapi kuat sehingga dapat menembakan peluru dengan lancar dan mudah. Untuk peningkatan sifat mekanis dilakukan perlakuan panas precipitation hardening melalui proses pemanasan pada temperatur 500oC selama 1 jam kemudian dicelup di dalam air sampai mencapai temperatur kamar, setelah itu untuk peningkatan kekerasan dilakukan proses aging (penuaan) pada temperatur 90, 120, 150, 180 dan 210oC masing-masing selama 8,9 dan 10 jam. Karakterisasi aluminium setelah mengalami precipitation hardening adalah dengan melakukan pengujian kekerasan metode Vickers dan pengamatan struktur mikro. Dari hasil pengujian kekerasan diperoleh hasil bahwa kekerasan terus meningkat mulai dari temperatur aging 90oC sampai dengan temperatur aging 150oC. Kekerasan maksimum diperoleh pada temperatur aging 150oC sebesar 103 HV. Di atas temperatur 150oC terjadi penurunan kekerasan yang menandakan bahwa terjadi over aging pada temperatur di atas 150oC yang ditandai dengan makin membesarnya presipitat Mg2Si. Kondisi aging optimum yang dapat diterapkan untuk precipitation hardening T6061 yang diaplikasikan untuk selongsong peluru adalah temperatur aging 150oC selama 8, 9 dan 10 jam.
The rapid progress of the modern age, especially the development of technology towards industry 4.0, requires people to work more effectively and efficiently by trying to replace the traditional work patterns that rely heavily on human labor with machines,. In the village of Karihkil, Ciseeng, Bogor Regency, there are many home-industry manufacturers of various cassava chips. This business is still done manually so that it affects the quality and quantity of cassava chips they produce. This business opportunity needs to be developed further by increasing the cutting capacity of the cassava chips, given the fact that the manufacturers still use manual cassava cutting tools. In this present community-service activity the cassava chopper machine was designed and fabricated with a motor drive source (using a crank rotation) so that an increase in production results would be obtained by accelerating the process of cutting cassava into chips. This chopping machine was designed to work simultaneouly with the frying process so that the whole process occurred only once to obtain cassava chips ready for packaging. By using this new process, there was an increase in the production of cassava chips by two times. In addition, the thickness (1 mm) and dimension (diameter 3 cm) of cassava chips were consistently produced. This machine was also designed to overcome existing deficiencies with manual workmanship such as irregular cutting thickness and cracked cuts.
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