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All Journal SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Jurnal Rekayasa Mesin
Karyadi, Gabriel Bagus
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Automotive Engineering Control & Systems Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Optimalisasi Ketangguhan dan Kekerasan Baja AISI 4340 pada Shank Holder Dovetail Cutter paska Proses Hardening dengan Minimasi Biaya Proses Ismartaya, Kristian; Karyadi, Gabriel Bagus; Bawono, Baju; Anggoro, Paulus Wisnu
Jurnal Rekayasa Mesin Vol 17, No 3 (2022): Volume 17, Nomor 3, Desember 2022
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v17i3.3982

Abstract

UMKM bengkel manufaktur membuat Shank Holder Dovetail Cutter berbahan AISI 4340 secara mandiri. Nilai kekerasan pada Shank Holder Dovetail Cutter wajib dimiliki agar alat memiliki umur pakai panjang. Proses hardening menimbulkan dilema berupa resiko kerusakan pada area kritis shank holder, yaitu material pecah bila kekerasan terlalu tinggi namun ketangguhan rendah, atau material mengalami deformasi bila kekerasan rendah. Diperlukan analisis parameter proses hardening untuk menghasilkan kombinasi nilai kekerasan dan ketangguhan yang optimal, serta biaya proses minimal guna mendukung UMKM bengkel manufaktur. Desain eksperimen menggunakan metode Response Surface Method untuk optimalisasi respon dan analisis statistik ANOVA untuk mengidentifikasi kontribusi setiap parameter bagi variabel respon. Parameter suhu austenite, media quench, dan suhu temper menjadi variabel prediktor. Hasil pengujian kekerasan Rockwell-C ASTM E18 dan uji ketangguhan Impact Charpy V-notch E23 diterapkan sebagai variabel respon. Suhu temper merupakan parameter proses hardening yang secara signifikan mempengaruhi nilai kekerasan dan ketangguhan. Suhu temper memberikan kontribusi sebesar 87,44% terhadap respon nilai kekerasan, serta kontribusi 24,77% dan 43,44% terhadap respon nilai ketangguhan. Kombinasi parameter suhu austenite 871,76°C, media quench air, suhu temper 200°C memberikan respon optimal terbaik dengan nilai desirability 0,790; biaya proses Rp.42.586,58; nilai kekerasan 51,211 HRC; dan nilai ketangguhan 1,131 J/mm2
Design and Manufacture of Automatic Collet Clamping Systems for Sprocket-CAM Handling on CNC Lathes Ismartaya, Kristian; Wijaya, Thomas Ganda; Purnomo, Roberts; Karyadi, Gabriel Bagus
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 18 No. 2 (2024): SINTEK JURNAL
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.18.2.99-112

Abstract

A proper clamping system reduces clamping time, enhances process repeatability, and increases flexibility in product replacement, significantly improving a company's competitiveness in terms of time and cost. The chamfering process for the KN-00XX series sprocket-cam product at PT. Toshin Prima Fine Blanking faced challenges due to the absence of a clamping device capable of quickly, securely, and automatically accommodating the contour clamping process while ensuring a long service life. To address this, optimizing existing spare parts, such as collets and pneumatic mechanisms, was essential to minimize manufacturing costs. This research aimed to design and evaluate a chuck tool that reduces product installation time and optimizes component stock to lower manufacturing costs. The study applied the VDI 2221-QFD method, where VDI 2221 identified functional requirements and user needs, while QFD assessed these needs and prioritized them for cost-effective design. Finite Element Analysis (FEA) was used to evaluate the design's strength and performance. The resulting pneumatic collet clamping design showed an actual von Mises stress value of 1,044,029 kN/m², safely below the maximum allowable value of 1,080,000 kN/m². FEA analysis indicated a collet displacement of 0.37 mm, close to the actual measured value of 0.42 mm, meeting clamping requirements. The estimated manufacturing cost of the pneumatic collet clamping system was Rp. 1,472,769. Actual trials demonstrated an average cycle time of 9.8 seconds, confirming that the pneumatic collet clamping design is safe, efficient, and fulfills specified requirements.
Co-Authors Baju Bawono, Baju Ismartaya, Kristian Paulus Wisnu Anggoro Purnomo, Roberts Wijaya, Thomas Ganda