Analisis Efek Temperatur Pouring Dan Temperatur Preheat Flask Terhadap Kekerasan Dan Porositas Perhiasan Cincin Logam Sterling Silver

Tama, Vira Yudha (2023) Analisis Efek Temperatur Pouring Dan Temperatur Preheat Flask Terhadap Kekerasan Dan Porositas Perhiasan Cincin Logam Sterling Silver. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Rapid investment casting merupakan teknik produksi yang mengabungkan teknologi manufaktur aditif dan teknologi pengecoran yang memiliki tujuan dapat membuat objek dengan bentuk kompleks dengan biaya produksi yang relatif rendah, serta fleksibilitas dalam membuat bentuk objek berbeda tanpa harus menambah biaya tambahan.. Logam yang populer digunakan dalam industri perhiasan merupakan logam paduan dari jenis perak, emas, atau platinum. Perak digunakan karena sifatnya yang duktil serta sifat permukaan yang sangat mengkilap. Sterling Silver adalah logam paduan dengan minimum unsur 92,5% silver, dan 6-4 % cuprat. Pada penelitian ini logam sterling silver di tuang kedalam flask menggunakan mesin cetakan centrifugal. Flask yang berisi cetakan investasi sebelumnya di bakar di dalam electric furnance serta di pre-heat. Sterling silver di tuang dalam variasi temperatur 950℃,1000℃,dan 1050℃ serta variasi untuk temperatur pre-heat flask adalah 550℃,dan 600℃.Dilakukan pengujian kekerasan, pengujian visual, pengujian metallografi , dan pengujian Archimedes pada sampel hasil pengecoran. Variasi temperatur yang optimal untuk menhasilkan porositas gas terendah adalah temperatur preheat flask 600 ˚C dengan temperatur pouring 1050 ˚C memiliki nilai porositas gas 0,55%. Varasi temperatur dengan hasil nilai kekerasan tertinggi adalah temperatur preheat flask 550 ˚C dengan temperatur pouring 950 ˚C memiliki nilai kekerasan 138,3 VHN. Variasi dengan jenis cacat paling kecil diamati pada variasi preheat flask dengan dua jenis cacat makro yaitu sandy surface,dan hot tearing.
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Rapid investment casting is a production technique that combines additive manufacturing technology and casting technology with the goal of being able to make objects with complex shapes at relatively low production costs, as well as flexibility in making different shapes of objects without having to add additional costs. A popular metal used in industry Jewelry is a metal alloy of silver, gold or platinum. Silver is used because it is ductile and has a very shiny surface. Sterling Silver is an alloy with a minimum of 92.5% silver and 6-4% silver. In this study, sterling silver metal was poured into the flask using a centrifugal molding machine. The flask containing the previous investment molds is burned in an electric furnace and pre-heated. Sterling silver is poured at various temperaturs of 950℃, 1000℃ and 1050℃ and variations for pre-heat flask temperaturs are 550℃ and 600℃. Hardness testing, visual testing, metallographic testing, and Archimedes testing are carried out on the casting samples. The optimal temperatur variation to produce the lowest gas porosity is the preheat flask temperatur of 600 ˚C with a pouring temperatur of 1050 ˚C having a gas porosity value of 0.55%. The temperatur variation with the highest hardness value is the preheat flask temperatur of 550 ˚C with a pouring temperatur of 950 ˚C with a hardness value of 138.3 VHN. Variations with the smallest types of defects were observed in the preheat flask variations with two types of macro defects, namely sandy surface and hot tearing.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Sterling silver, Investment casting, Casting defects, Sterling silver, investment casting, cacat pengecoran
Subjects:	T Technology > TS Manufactures > TS233 Sand casting. Metal castings--Thermal properties.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Vira Yudha Tama
Date Deposited:	10 Feb 2023 01:34
Last Modified:	10 Feb 2023 01:34
URI:	http://repository.its.ac.id/id/eprint/96558

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