Analisis Cacat Proses Lost PLA Casting untuk Manufaktur Propeller Kapal Cepat Tanpa Awak menggunakan Aluminium 6061 dengan Variasi Diameter Runner dan Tinggi Sprue. (Defect Analysis of Lost Pla Casting Process for Manufacturing Unmanned Speedboat Propeller Using 6061 Aluminum with Variation of Runner Diameter and Sprue Height).

Digdaya, Alansyari David Satria (2025) Analisis Cacat Proses Lost PLA Casting untuk Manufaktur Propeller Kapal Cepat Tanpa Awak menggunakan Aluminium 6061 dengan Variasi Diameter Runner dan Tinggi Sprue. (Defect Analysis of Lost Pla Casting Process for Manufacturing Unmanned Speedboat Propeller Using 6061 Aluminum with Variation of Runner Diameter and Sprue Height). Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.

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Official URL: http://repository.untag-sby.ac.id

Abstract

The rapid advancement of maritime technology has driven innovation in the design and production of high-speed Unmanned Surface Vehicles (USVs). One of the critical components in the USV propulsion system is the propeller, which functions to convert mechanical energy from the engine into thrust. Therefore, the design and quality of the propeller greatly influence the vessel’s performance. In the manufacturing process of propellers, metal casting is a commonly used method due to its ability to produce complex shapes. However, this method also presents challenges, particularly related to the gating system design. This study aims to analyze the influence of runner diameter variations and sprue height variations on the quality of propeller castings. This method was chosen for its capability to achieve high precision. The process begins with pattern design, followed by the fabrication of a master pattern. Next, the gating system is assembled, a mold is created using ceramic slurry, the PLA pattern is melted out, and molten aluminum is poured using a vacuum machine at 0.8 bar pressure and a temperature of 900°C. The resulting castings undergo a finishing process and are evaluated using Non-Destructive Testing (NDT) with the dye penetrant technique and microstructural observation. The test results show that variations in runner diameter and sprue height significantly affect the formation of casting defects such as porosity, air cavities, and shrinkage. A runner diameter that is too small tends to restrict the flow of molten metal, increasing the risk of defects, while an excessively large diameter can lead to turbulence. Sprue height also affects the pressure of the metal flow into the mold. Dye penetrant testing revealed differences in the intensity and pattern of defect indications for each variation, while microstructural analysis revealed the distribution of metal grains and internal defects. Based on the results of this study, it can be concluded that optimizing the design of the gating system is crucial to producing high-quality propellers. These findings are expected to serve as a reference for the development of precision casting processes for maritime components such as high-speed USV propellers.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Lost PLA Casting, propeller, high-speed unmanned vessel, runner diameter variation, sprue height
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Fakultas Teknik > Program Studi Teknik Mesin
Depositing User: 1422100098 Alansyari David Satria Digdaya
Date Deposited: 30 Apr 2002 18:49
Last Modified: 30 Apr 2002 18:49
URI: http://repository.untag-sby.ac.id/id/eprint/40922

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