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All Journal Jurnal Rekayasa Mesin JMPM (Jurnal Material dan Proses Manufaktur) JURNAL DINAMIKA VOKASIONAL TEKNIK MESIN Techne : Jurnal Ilmiah Elektroteknika Teknobiz : Jurnal Ilmiah Program Studi Magister Teknik Mesin JURNAL CRANKSHAFT International Journal of Applied Sciences and Smart Technologies Jurnal Tekstil: Jurnal Keilmuan dan Aplikasi Bidang Tekstil dan Manajemen lndustri
Perwita Kurniawan
Politeknik ATMI Surakarta
Automotive Engineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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Perancangan dan Analisis Mesin Pencacah untuk Limbah Hasil Purging dengan Menggunakan Metode Computer Aided Engineering Mikail Tito Rendo Prawara; Perwita Kurniawan; Aditya Nugraha; Agustinus Wisnu Setiawan
Teknobiz : Jurnal Ilmiah Program Studi Magister Teknik Mesin Vol. 13 No. 2 (2023): Teknobiz
Publisher : Magister Teknik Mesin Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/teknobiz.v13i2.5288

Abstract

Plastik merupakan salah satu material yang tidak bisa dipisahkan dari kehidupan manusia karena mudah dibentuk, praktis, ringan, tidak berkarat, dan tentu saja lebih ekonomis. Plastik banyak digunakan untuk produk makanan, bidang otomotif, bidang farmasi, bidang pertanian, bidang konstruksi, bidang elektronika, bidang industri hingga kosmetika. Salah satu proses yang umum digunakan yaitu proses injection molding, proses yang kurang sempurna akan mengakibatkan cacat atau kegagalan pada produk. Untuk mengurangi hasil cacat produk maka salah satu proses yang digunakan adalah proses purging pada barrel. Limbah hasil purging atau biasa disebut avalan belum dapat diolah secara maksimal seperti limbah cacat produk dan runner. Penelitian ini menghasilkan sebuah rancangan alat atau mesin pencacah untuk mencacah limbah hasil purging pada mesin injeksi molding. Mekanisme pencacahan yang digunakan menggunakan tipe gunting atau shear. Hasil analisis menunjukan pada bagian tengah poros komponen tersebut memenuhi syarat keamanan, diindikasikan dengan nilai tegangan yang terjadi akibat pembebanan sebesar 8,885.10-10 N/m² hingga 7,283.10-3 N/m², nilai tersebut jauh dibawah tegangan maksimal ijin / yield strength sebesar 5,650e+02 N/mm². Sedangkan untuk bilah pisau memiliki nilai tegangan yang terjadi akibat pembebanan sebesar 7,656.10-5 N/m² hingga 7,627.10-2 N/m², nilai tersebut jauh dibawah tegangan maksimal ijin / yield strength sebesar 2,000.102 N/mm².
The Effect of Injection Parameters on Warpage, Shrinkage, and Tensile Strength of Polypropylene Composites Andre Bawono, Julius; Budiarto; Kurniawan, Perwita
Jurnal Rekayasa Mesin Vol. 20 No. 2 (2025): Volume 20, Nomor 2, Agustus 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i2.6573

Abstract

Polypropylene composite material is an environmentally friendly material when compared to other polymer materials because the composition of polypropylene is only 76% and the remaining 24% is limestone. The use of this composite material is to reduce dependence on the use of Acrylonitrile Butadiene Styrene (ABS) and Acrylic Styrene (AS) resins because both materials are difficult to decompose and recycle. The "base" product made from this material has a warpage defect that causes a gap effect when the product is installed with other components. Therefore, a study was conducted on the effect of mold temperature and holding pressure on warpage defects, shrinkage, tensile strength and surface morphology. This study used an experimental method with variations in mold temperature used were 20°C, 40°C, and 60°C, variations in holding pressure used were 70 bar, 110 bar, and 150 bar. Testing was carried out by measuring dimensions to determine warpage, shrinkage percentage, measuring tensile strength and observing surface structure. The warpage value decreases by 29% at high mold temperatures and increases by 84% at high holding pressure. The shrinkage percentage decreases with increasing mold temperature and holding pressure in the transverse direction by 7.14%-9.52% at constant pressure and 25%-26.29% at constant temperature, in the longitudinal direction by 1.27%-6.21% at constant pressure and 13.92%-17.95% at constant temperature. The optimal parameters to obtain the highest tensile strength of 26.77 MPa are at a mold temperature of 60°C and a holding pressure of 110 bar.
Mechanical Properties and Homogenous Analysis of Semirigid Polyurethane Foam used in Headliner Roof Top Manufacturing Process Nugroho, Adi; Antonius Fajar Bisma; Perwita Kurniawan
Jurnal Rekayasa Mesin Vol. 20 No. 2 (2025): Volume 20, Nomor 2, Agustus 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i2.6575

Abstract

In the automotive industry with four wheels or more, polyurethane is used as the main material in making roof top headliners. The process of making roof top headliners often experiences product defects, namely breaks (cracks or fractures). The study was conducted to analyze the homogeneity of mechanical characteristics at various positions in one block of polyurethane foam that had been cut into sheets with a thickness of 8 mm. Samples were taken representing vertical and horizontal positions and tested using the true experiment spatial sampling method. From this study, it was found that the density in one block of semi-rigid polyurethane foam was not homogeneous. There were differences in density in the upper, middle and lower materials in zones 1 to 9. The density value is directly proportional to the bending strength value and inversely proportional to the elongation value. In the zone where the elongation value is low, there is a risk of product defects in the form of fractures if the product's formability strength simulated using NX software is higher than 18%.
MODIFICATION OF THE INDONESIAN GROWING BUCKET COVER DESIGN ON THE THICKNESS OF THE PIPE PLACE TO REDUCE WARPAGE USING SOLIDWORKS PLASTICS SOFTWARE Kurniawan, Perwita; Suprabo, Cornelius Tyas Lintang; Silvaro, Stefanus Bima; Hutama, Adhi Setya
Jurnal Dinamika Vokasional Teknik Mesin Vol. 9 No. 2 (2024)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v9i2.77238

Abstract

Cover Indonesian Growing Bucket has a product defect problem in the form of a warpage caused by a design considered good. There was a discrepancy in the parameter settings with the initial analysis results, resulting in a difference in cooling time of 2.3 s from the original 3.9 s. This happened because parameter changes aimed to reduce warpage cycle time from the original 25.4 s to 23.8 s. Based on the problems, design modifications and analysis were carried out using Solidworks Plastics software. The design modification and analysis process was carried out using the Experiment of Analysis method, which was carried out by modifying the thickness of the part, which resulted in a warpage. The analysis was carried out to obtain optimal thickness results with the smallest cooling time gap. Modifications and design analysis are done by making three (3) alternative thicknesses for the pipe clamp section. The best modification of the three (3) alternatives made will be used as a reference basis for making material cost calculation data. From the results of design modifications and analysis, it was found that the design thickness changed to 1.5 mm. Based on the results of this analysis, alternative options are produced, which are then used as a reference in design modifications so that the resulting fill time and cycle time are more optimal.
Analisis Kegagalan Mesin Produksi Rokok Cigarillos dengan Metode FMEA Hutama, Adhi Setya; Nugroho, Th. Adi; Kurniawan, Perwita; Aji, Bayu Crisna; Nuriyah, Sinta
JURNAL CRANKSHAFT Vol 6, No 3 (2023): Jurnal Crankshaft Vol.6 No.3 (2023)
Publisher : Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/crankshaft.v6i3.11255

Abstract

Industri Hasil Tembakau menjadi salah satu sektor manufaktur nasional yang strategis, berkontribusi besar dan berdampak luas terhadap pembangunan bangsa. Salah satu industri yang bergerak dibidang pengolahan hasil tembakau adalah PT. XYZ, dengan produknya adalah rokok cigarillos. Mesin produksi pada produk ini terdiri dari gluing dan  cutting. Hasil wawancara yang dilakukan peneliti selama bulan agustus – oktober 2022 ditemukan adanya cacat produk berupa seperti broken (873 pcs) dan wrapper loose parah (14.521), dengan total prosentase rata rata 30%, melebihi standar yang ditetapkan perusahaan (15%). Hal ini imbas dari kondisi mesin yang tidak terawat (roll finger dan vacuum roll kotor menyebabkan wrapper loose, dan bunker yang bermasalah menyebabkan rokok patah). Metode Failure Mode and Effect Analysis (FMEA) digunakan dalam studi ini untuk mengidentifikasi risiko kegagalan, mendapatkan nilai Risk Priority Number  (RPN) dan memberikan usulan perbaikan untuk produksi selanjutnya. Studi ini berhasil menemukan penyebab kegagalan produksi yaitu roller tidak bersinggungan dengan belt (Nilai RPN adalah 45). Rekomendasi yang diberikan kepada perusahaan adalah modifikasi dudukan roll belt dengan memperbesar radius atas pada dudukan belt.
Co-Authors Adi Nugroho ADITYA NUGRAHA Aditya Nugraha Agustinus Wisnu Setiawan Aji, Bayu Crisna Andre Bawono, Julius Andrean Van Halen Antonius Fajar Bisma Budiantoro, Cahyo Budiarto Budiyantoro, Cahyo Cahyo Budiantoro Hutama, Adhi Setya Hutama, Adhi Setya Ivanda Bintang Cahya Putra Mikail Tito Rendo Prawara Nuriyah, Sinta Oscar Pambudi Prakosa Rinanto, Andhy Rusmana, Gregorius Bian Sartoyo, Millenino Bergas Silvaro, Stefanus Bima Suprabo, Cornelius Tyas Lintang TH Adi Nugroho Tri Hannanto Saputra