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All Journal AUSTENIT Jurnal Sains dan Teknologi Algebra : Jurnal Pendidikan Sosial dan Sains
Baiti Hidayati
Politeknik Negeri Sriwijaya
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THE EFFECT OF QUENCHING WITH VARIOUS COOLING MEDIA ON THE HARDNESS OF LEAD SCREW PIN IN A LATHE MACHINE Muhammad Rizki Akbar; Fenoria Putri; Baiti Hidayati
Algebra : Jurnal Pendidikan, Sosial dan Sains Vol. 6 No. 1 (2026): Algebra : Jurnal Pendidikan Sosial dan Sains
Publisher : Yayasan Amanah Nur Aman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58432/k70yeh39

Abstract

This study analyzes the effect of the quenching process with various cooling media on the hardness of lead screw keys in a lathe. The objective was to determine the most effective cooling media for improving the key's mechanical properties, which play a critical role in the performance and durability of the lead screw. The cooling media tested included water, fresh SAE 10W-40 oil, and used SAE 10W-40 oil. The research method involved heat treatment at 850°C, followed by quenching using each medium, and then testing the hardness using the Rockwell B (HRB) method. The results revealed an unexpected finding: the untreated key had the highest hardness value (97.05 HRB), surpassing all quenched samples. Among the hardened samples, water produced the highest hardness (91.88 HRB), followed by used oil (82.32 HRB) and fresh oil (78.66 HRB). This indicates that the quenching process did not increase hardness and, in some cases, even decreased it. Potential causes include temperature instability during heat treatment and inaccurate material characterization, as SEM analysis failed to confirm the expected composition of the high-carbon steel. This study concluded that the quenching parameters and material characterization methods require refinement. Future research is recommended to utilize more precise temperature control, validate the material composition using techniques such as Optical Emission Spectroscopy (OES), and explore alternative cooling media. These findings emphasize the importance of precise heat treatment process control to achieve desired mechanical properties in industrial applications.
Peningkatan Efisiensi Produksi Briket Batok Kelapa Menggunakan Mesin Cetak Kapasitas 10kg Baiti Hidayati; M. Rasid; Herlin Sumarna; Romli Romli; Aji Pangestu Wijaya
INSOLOGI: Jurnal Sains dan Teknologi Vol. 5 No. 2 (2026): April 2026
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v5i2.8091

Abstract

Manual production of coconut shell briquettes in small and medium-scale industries often faces limitations in productivity, product uniformity, and dependence on human labor. This study aimed to evaluate the efficiency improvement of coconut shell briquette production through the use of a 10 kg-capacity briquetting machine. An experimental method was applied by comparing mechanical briquetting and manual hand-pressing using the same raw material composition, namely 7 kg of coconut shell charcoal powder, 3 kg of tapioca starch adhesive, and 1 liter of water as a mixing aid. The observed parameters included production capacity, production time, physical quality score, quality consistency, and electrical energy consumption. The results showed that the machine produced 10 kg of briquettes in 1 hour, whereas the manual method produced approximately 3.3 kg per hour and required about 3 hours to reach the same production quantity. The machine increased production capacity by approximately 200% and reduced production time by approximately 67%. The physical quality score increased from 70% to 85%, while quality consistency increased from 80% to 95%. Although the machine consumed 0.5 kWh per process, the energy requirement was relatively low, equivalent to 0.05 kWh/kg of briquettes. These findings indicate that the 10 kg-capacity briquetting machine is feasible as an appropriate technology to improve productivity and product uniformity for small and medium-scale coconut shell briquette producers.
FINITE ELEMENT ANALYSIS USING ANSYS OF THE PHASE CHANGE MATERIAL (PCM) COOLING SYSTEM ON A 3V LIFEPO4 BATTERY CELL FOR BATTERY PACK APPLICATION Teyzar Shafatullah; Baiti Hidayati; Mohd A.F Rosli
AUSTENIT Vol. 18 No. 1 (2026): Austenit: April 2026
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36257/austenit.v18i1.11876

Abstract

Passive thermal management in LiFePO₄ cells was evaluated using three Phase Change Material (PCM) formulations through transient thermal analysis in ANSYS Workbench at charging rates of 1 C, 2 C, and 3 C. The PCM tested consisted of PCM1 (90 wt% paraffin + 10 wt% expanded graphite), PCM2 (n-docosane), and PCM3 (Suntech P116 paraffin wax). At a speed of 1 C, PCM1 produced the most even temperature distribution with a range of only 26.03–27.45 °C (ΔT ≈ 1.42 °C), PCM2 showed a peak temperature of 27.50 °C, while PCM3 succeeded in suppressing the peak temperature to the lowest value of 27.04 °C. At a speed of 2 C, PCM1 maintained an even temperature distribution in the range of 39.67–54.73 °C (ΔT ≈ 15.1 °C), PCM2 recorded the highest peak temperature of 56.28 °C, and PCM3 reached the lowest peak temperature of 53.54 °C. At a discharge rate of 3 C, PCM1 minimizes the temperature gradient with the same range of 39.67–54.73 °C (ΔT ≈ 15.1 °C), PCM2 acts as a heat buffer with a peak temperature of 56.28 °C, while PCM3 remains the most effective in suppressing the peak temperature to 53.54 °C. Overall, PCM1 excels in maintaining the uniformity of temperature distribution, while PCM3 consistently produces the lowest peak temperatures across all tested charging rates, making it the strongest candidate for fast charging applications in LiFePO₄ cells.
Co-Authors Aji Pangestu Wijaya Fenoria Putri Herlin Sumarna M. Rasid Mohd A.F Rosli Muhammad Rizki Akbar Romli Romli Teyzar Shafatullah