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All Journal Jurnal Rekayasa Mesin Jurnal Mekanik Terapan Journal of Integrated and Advanced Engineering (JIAE)
Matahelumual, Marselino
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Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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PENGUJIAN PROTOTYPE MESIN INJKESI PLASTIC MOLDING MANUAL DOUBLE BARREL KAPASITAS 5 TF Matahelumual, Marselino; Muslimin, Muslimin
Jurnal Rekayasa Mesin Vol. 19 No. 2 (2024): Volume 19, Nomor 2, Agustus 2024
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v19i2.5317

Abstract

The plastic injection method is a technique for producing plastic products with different properties and dimensions. The product is made from a combination of materials in the form of particle plastic material, which is used in this study is a thermoplastic polypropylene (PP) type material, this material becomes soft when heated and vice versa becomes hard again when cooled. The conversion of these raw materials is only physical and not chemical conversion, so these raw materials can be recycled if necessary. Plastic injection must meet the requirements such as shape, size and not have defects in the final product injection results such as short shots defects, flashing defects, sink marks defects and flow mark defects and weld lines. The process of injection of plastic products requires optimal parameter settings, namely, heating temperature, melting point, cooling, residence time and injection speed. So that in testing using a manual double barrel plastic injection molding machine with a capacity of 5 tf (5 ton-force = 5000 kg, calming force on molding), it is mandatory to get proper temperature variations and optimal parameter settings, in order to get perfect injection results, in the study The method used is an experimental method consisting of temperature variations of 160 °C, 180 °C and 200 °C which were carried out three times for each temperature variation. After conducting research, we found perfect product results after cleaning, that is, at a temperature test of 180 °C, because only minor flashing defects occurred in the final product. Low and high heater temperature settings, greatly affect the final product.
Ergonomic Assessment and Relationship between Workload and Fatigue in Kitting Section Operators Nidhar, Ainun; Auberta, Genia; Nursalam, Rachmat; Matahelumual, Marselino; Sjahrul Annas, Muhammad
Journal of Integrated and Advanced Engineering (JIAE) Vol 4, No 2 (2024)
Publisher : Akademisi dan Saintis Indonesia (ASASI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51662/jiae.v4i2.163

Abstract

In the manufacturing industry, specifically in automotive sector, musculoskeletal disorders (MSDs) account for 11.4% of all workplace injuries. This is primarily due to the high demand for increased production capacity. The process of assembling automotive parts involves manually organizing materials before they are sent to the assembly line. The handling of large material loads and repetitive movements during this kitting process can significantly increase the risk of MSDs. A study was conducted to examine the ergonomic risks associated with the kitting process in a manufacturing environment. The study utilized the Rapid Entire Body Assessment (REBA) method to evaluate kitting operators for potential musculoskeletal disorders (MSDs) related to lifting, carrying, and placing materials during the kitting process. Additionally, kitting operators completed the Nordic Body Map (NBM) questionnaire for self-assessment. According to the REBA results, lifting activities (11 points) posed the highest risk, followed by placing materials (7 points) and carrying materials (4 points). The NBM responses indicated complaints of pain in the hands, shoulders, and back, with NBM scores of 36 and 48 points, signifying a low risk. Immediate action is necessary to reduce MSD complaints among packaging operators based on hazard control analysis. Recommendations have been made for ergonomic interventions, including improving work postures, regulating loads through ergonomic training, utilizing assistive devices, and making workspace adjustments to minimize the risk of MSDs. By implementing appropriate interventions and preventive measures, the risk of MSDs among kitting operators can be reduced, while improving work safety, comfort, and maintaining productivity and process efficiency
Redesain Alat Pencekam Plat dalam Konteks Jig and Fixture Pada Proses Pengelasan di Meja Kerja Rizka, Hawa; Matahelumual, Marselino; Ramadhan, Mochammad Tendi Noer; Heryana, Ghany
Jurnal Mekanik Terapan Vol 5 No 2 (2024): Agustus 2024
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/jmt.v5i2.6545

Abstract

Proses pengelasan ialah metode penyambungan dua atau lebih material logam dengan menggunakan panas atau tekanan. Tujuannya adalah untuk menciptakan ikatan yang kuat antara material tersebut sehingga membentuk satu struktur yang padu. Proses ini melibatkan pemanasan material hingga titik lelehnya atau menggunakan tekanan untuk menyatukan mereka, dan sering kali menggunakan bahan tambahan untuk mengisi celah antara material yang akan disambung. Proses pengelasan plat seperti praktik dasar biasa menggunakan manual fixture yaitu pencekam manual yang dipegang oleh tangan dan mencekam plat seperti tang buaya, sehingga dalam hal ini membuat tidak efisien dalam proses pengelasan maka dari itu memerlukan welding fixture atau alat pencekam. Pembuatan cekam ini dilakukan untuk memudahkan ketika proses pengelasan. Welding fixture dibuat seperti clamp dengan memodifikasinya menyesuaikan dengan meja kerjanya, bisa digunakan dalam sudut pengelasan 45o, jarak antar kisi 3mm dan ketebalan kisi 3mm. Konsep desain dibuat dengan dimensi 25mmx12,5mmx25mm dengan perhitungan konepleksitas unuk mengetahui kesulitan pada produk dan proses serta menggunakan perhitungan assembly efisiensi untuk mengetahui seberapa efisien konsep desain tersebut.
Co-Authors Ainun Nidhar, Ainun Auberta, Genia Ghany Heryana Muslimin Muslimin Nursalam, Rachmat Ramadhan, Mochammad Tendi Noer Rizka, Hawa Sjahrul Annas, Muhammad