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All Journal Rotasi Jurnal Statistika Universitas Muhammadiyah Semarang JTAM (Jurnal Teori dan Aplikasi Matematika) Jurnal Optimalisasi Batara Wisnu : Indonesian Journal of Community Services PROCEEDINGS CONFERENCE ON DESIGN AND MANUFACTURE AND ITS APPLICATION
Ridhani Anita Fajardini
Politeknik Perkapalan Negeri Surabaya
Control & Systems Engineering Decision Sciences, Operations Research & Management Education Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering

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Optimasi Laju Pengerjaan Material AISI P20 Proses Electrical Discharge Machining (EDM) Sinking Menggunakan Metode Taguchi Farizi Rachman; Dhika Aditya Purnomo; Tri Andi Setiawan; Ridhani Anita Fajardini
Jurnal Statistika Universitas Muhammadiyah Semarang Vol 8, No 2 (2020): Jurnal Statistika Universitas Muhammadiyah Semarang
Publisher : Department Statistics, Faculty Mathematics and Natural Science, UNIMUS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26714/jsunimus.8.2.2020.95-102

Abstract

Electrical Discharge Machining atau EDM merupakan proses permesinan non-konvensional. Sistem kerja EDM dengan memanfaatkan energi panas dari proses loncatan bunga api listrik (spark) akibat adanya perbedaan muatan di antara elektroda dan benda kerja yang terisi cairan dielektrik. EDM sinking secara digunakan untuk memproduksi mold dan dies. Salah satu material yang digunakan dalam industri pembuatan mold adalah AISI P20. Pada proses pembuatan mold menggunakanEDM sinking perlu memperhatikan laju pengerjaan material yang memiliki karakteristik kualitas semakin besar nilainya maka semakin baik. Nilai laju pengerjaan material yang besar dapat meminimalkan biaya produksi. Metode Taguchi digunakan dalam penelitian ini untuk menghasilkan nilai optimal laju pengerjaan material. Desain eksperimen menggunakan orthogonal array L18 untuk mengkombinasikan empat variabel proses yaitu jenis elektroda, gap voltage, on time, dan off time. Berdasarkan hasil analisa setting parameter untuk laju pengerjaan material yang optimal menggunakan tembaga, gap voltage 40 volt, on time 150 μs, dan off time 20 μs.
Optimization of Surface Roughness of AISI P20 on Electrical Discharge Machining Sinking Process using Taguchi Method Farizi Rachman; Dhika Aditya Purnomo; Ridhani Anita Fajardini; Rena Riza Umami
JTAM (Jurnal Teori dan Aplikasi Matematika) Vol 5, No 1 (2021): April
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jtam.v5i1.3291

Abstract

This research aims to obtain optimal value for the surface roughness of the material AISI P20 on the Electrical Discharge Machining (EDM) Sinking process. In the present research, the Taguchi method is used to investigate the significant influence of process variables on the machining performance and determine the combination of process variables on the EDM process. Orthogonal array L18 (21 × 33) based on the Taguchi method is chosen for the design of experiment. The experiment is replicated twice to finding out the influence of four process variables such as type of electrode, voltage gap, on-time, and off-time on the response performance. Machining performance is evaluated by surface roughness as a response variable that had quality characteristics, smaller is better. These experimental data were analyzed using the Signal-to-noise ratio and Analysis of Variance. The analysis results show that the surface roughness is influenced by the type of electrode and on time. Combination of process variables to obtain optimal surface roughness are using graphite electrodes, and setting values of gap voltage 40 volt, on-time 250 μs, and off-time 20 μs. This combination of process variables can be applied to the manufacturing process using EDM sinking in order to produce a good quality product that determined based on the surface roughness value.
Design and Fabrication of Jig and Fixture for Milling Operations in the Manufacturing Sector Indrawan, Rizal; Purnomo, Dhika Aditya; Bisono, Fipka; Karuniawan, Bayu Wiro; Fajardini, Ridhani Anita
ROTASI Vol 26, No 4 (2024): VOLUME 26, NOMOR 4, OKTOBER 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.4.54-59

Abstract

Fixtures and jigs are work-holding devices used to position and support workpieces. Fixtures and jigs are important tools in production because their use determines the performance of the entire production process of a product. There are still situations in the manufacturing sector where products manufactured could be more precise. Work-holding devices that facilitate the machining process must be developed to ensure that the final products satisfy the required criteria. This study aimed to design, manufacture, and evaluate fixtures and jigs and then assess how well they worked with test specimens in rectangular shapes. The jigs and fixtures are planned based on a vacuum table that is adjusted to the machining position on the side of the material. The intention of employing a vacuum system is to simplify the process of setting up the workpiece. Fusion360 Design Software was utilized to design fixtures and jig models. Since aluminum is easy to form and has high wear resistance, it was chosen as the workpiece material. CNC machine was employed in the manufacturing process. Testing of jig and fixture tools is carried out on the side of the test specimen. According to the study's findings, jigs and fixtures accelerate the milling process on the material side. When jigs and fixtures are used, the milling process proceeds 17.47 minutes. Using this jig and fixture makes it possible to shorten the operating time, making the milling process run more quickly. Furthermore, the final product has remarkable dimensional accuracy.
EDUKASI PEMILAHAN SAMPAH ORGANIK DAN ANORGANIK PADA ANAK-ANAK KB-RA MASJID JENDERAL SUDIRMAN SURABAYA Rosalina, Amanda; Sholihah, Mar’atus; Sari, Nur Fajar Aprilia; Gastriani, Ovi Prina; Rismawati, Ria; Fajardini, Ridhani Anita
Batara Wisnu : Indonesian Journal of Community Services Vol. 5 No. 1 (2025): Batara Wisnu | Januari - April 2025
Publisher : Gapenas Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53363/bw.v5i1.351

Abstract

Efforts to conserve the environment must begin with small, tangible actions in one's immediate surroundings. Waste management is particularly critical, as every human activity has the potential to generate waste. Therefore, it is crucial to educate young children about the environmental impacts of waste to cultivate their awareness and concern for their environment. This community service initiative aims to enhance early childhood awareness of waste management's importance at KB-RA Masjid Jenderal Sudirman Surabaya through a comprehensive waste sorting program for organic and inorganic materials. The methodology employs a participatory approach, actively engaging children in learning activities. Evaluation involves conducting pre-tests and post-tests, which include giving children different kinds of organic and inorganic waste samples and assessing them to sort the waste into appropriate bins. Data is processed and analyzed using the paired sample T-test approach with Minitab software. The study's results indicate a significant increase in knowledge following educational sessions and assistance in sorting organic and inorganic waste. It is anticipated that this positive behavior will extend to their homes and communities, making waste sorting a concrete step towards mitigating environmental issues caused by waste
Optimasi Multirespon Proses Permesinan EDM Sinking pada Material AISI P20 Menggunakan Metode Taguchi-Grey Relational Analysis Ridhani Anita Fajardini; Dhika Aditya Purnomo; Farizi Rachman
Proceedings Conference On Design Manufacture Engineering And Its Application Vol 4 No 1 (2020): Conference on Design and Manufacture and Its Aplication
Publisher : Proceedings Conference On Design Manufacture Engineering And Its Application

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Determining the combination of machining parameters is very important. The right machining parameters can produce optimal machining performance. EDM sinking is used to produce automotive components, aerospace, molds, and dies. AISI P20 is material that is widely used by manufacturing industry for dies and mold because of its hardness and resistance to heat. Based on these reasons, optimization is carried out to get appropriate parameter combination for the EDM sinking process using AISI P20. Process variables in this study are type of electrode, gap voltage, on time, and off time which aims to produce optimal response. Response variables observed were material removal rate, surface roughness, and electrode wear rate. Based on Taguchi method, matrix orthogonal L18 (21 × 73) was chosen for design of experiment. Taguchi method and Grey Relational Analysis used to optimize multiple responses simultaneously. Parameter optimum condition could be obtained by using graphite and setting values of gap voltage 50 volt, on time 250 ?s, off time 40 ?s. Percentage contribution of electrode type is 39,0733% whereas off time give contribution 32,4311%, on time 6,4574% and gap voltage 4,3590%.
Optimasi Parameter Proses Injeksi Molding Material Biokomposit Serat Sisal dan Polypropylene Terhadap kekuatan Impak Tsany, Rahmat Basya Shahrys; Sholihah, Mar’atus; Fajardini, Ridhani Anita; Ahmad, Mahasin Maulana; Maulidhia, Alief Nur Aisyi; Ilman, Abdillah Fashiha
Jurnal Optimalisasi Vol 11, No 2 (2025): Oktober
Publisher : Universitas Teuku Umar

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Abstract

The demand for environmentally friendly materials has driven the utilization of natural fiber–based biocomposites as an alternative engineering material. This study aims to optimize the injection molding process parameters of polypropylene (PP)–sisal fiber biocomposites with the aid of maleic anhydride polypropylene (MAPP) as a compatibilizer. The research scope covers the effect of process parameter variations on the mechanical properties, particularly impact strength. The composite material consists of 85% PP, 10% sisal fiber, and 5% MAPP, which were extruded into pellets prior to processing using an injection molding machine. Optimization was carried out using the Taguchi method with an L9 (3⁴) orthogonal array design. Four main parameters were investigated: barrel temperature (200°C, 210°C, 220 °C), injection pressure (50 bar, 55 bar, 60 bar), holding pressure (40 bar, 45 bar, 50 bar), and injection velocity (60 mm/s, 65 mm/s, 70 mm/s). The response variable was impact strength (kJ/m²) according to ASTM D256-04 standards, while other parameters were kept constant. Data were analyzed using the Signal-to-Noise Ratio (S/N ratio) with the “larger-the-better” criterion to obtain the optimum condition. The results showed that the optimum parameter combination A1B3C3D2 (200 °C, 60 bar, 50 bar, 65 mm/s) provided the best response, as this combination yielded the highest Signal-to-Noise ratio with a more stable impact performance. Under these conditions, the material flowed well into the mold, fiber distribution was uniform, and stronger bonding occurred between fiber and matrix, thereby enhancing the mechanical properties.
Implementation of the Taguchi Method for Optimizing Surface Roughness in the Aluminum Drilling Process Fajardini, Ridhani Anita; Mazwan, Mazwan; Utama, Satrio Darma
ROTASI Vol 27, No 2 (2025): VOLUME 27, NOMOR 2, JULI 2025
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.27.2.71-76

Abstract

Drilling is one of the important machining processes in the manufacturing industry, especially for lightweight materials such as aluminum. However, drilling aluminum poses significant challenges, including the generation of surface roughness and elevated temperatures in the cutting zone, which can accelerate tool wear. This study aims to optimize drilling parameters for aluminum under Minimum Quantity Lubrication (MQL) conditions, with surface roughness selected as the primary quality characteristic, where lower values indicate better performance. The investigated process parameters include spindle speed, feed rate, and type of cutting fluid. The experiments were designed using the Taguchi method with an L18 orthogonal array. Data were analyzed through signal-to-noise (S/N) ratio and analysis of variance (ANOVA) to identify the influence of each parameter. The results indicated that feed had the most significant effect on surface roughness, followed by spindle speed and the type of cutting fluid. The optimal combination of parameters, which includes a feed rate of 0.05 mm/rev, a spindle speed of 1500 rpm, and sunflower oil as the cutting fluid, yielded the lowest surface roughness and demonstrated the effectiveness of the Taguchi method in improving machining performance in aluminum drilling processes.
Co-Authors Ahmad, Mahasin Maulana Dhika Aditya Purnomo Farizi Rachman Fipka Bisono Gastriani, Ovi Prina Ilman, Abdillah Fashiha Karuniawan, Bayu Wiro Maulidhia, Alief Nur Aisyi Mazwan Mazwan Rena Riza Umami Rismawati, Ria Rizal Indrawan Rosalina, Amanda Sari, Nur Fajar Aprilia Satrio Darma Utama Sholihah, Mar’atus Tri Andi Setiawan Tsany, Rahmat Basya Shahrys