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Slamet Sutjipto
Politeknik Negeri Bandung
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Effect of Chromium Doping to Hardness Properties in the Manufacture of Spur Gears Made from Ferrous Powder Albert Daniel Saragih; Slamet Sutjipto
Jurnal Teknik Mesin (JTM) Vol 10, No 2 (2020)
Publisher : LP2M - Institut Teknologi Padang

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

Abstract

A gear is a part of a machine that has a very complex shape so that it requires special care and expertise in the manufacturing process. Powder metallurgy offers an efficient manufacturing process for the production of these complex machining parts. In this study, Cr metal powder was selected to increase the hardness properties of spur gears made from iron (Fe) powder. Doping Cr by 0%; 0.5%; 10%, 1.5% and 2.0% will be added in gear manufacturing. Water is used as a binder with a ratio of 1:15 which is then packed by 15,000 kg or 15 tons then heated or sintered at a temperature of 1200 oC for 1 hour. The shrinkage ratio of the sample to the sintering treatment averaged 4.6%. 0.2 kg of load applied to the Vickers hardness test. Vickers hardness values obtained were 60, 77, 90, 184 and 211 respectively for the Cr doping of 0%; 0.5%; 10%, 1.5% and 2.0%. From these data it is found that the addition of the element Cr increases the hardness properties of iron gears. The hardness value shown is still too small, this is because there is still a lot of porosity generated in the sintering process because it is not in a vacuum condition.
Effect of Chromium Doping to Hardness Properties in the Manufacture of Spur Gears Made from Ferrous Powder Albert Daniel Saragih; Slamet Sutjipto
Jurnal Teknik Mesin Vol 10 No 2 (2020): Jurnal Teknik Mesin Vol.10 No.2 October 2020
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (196.028 KB) | DOI: 10.21063/jtm.2020.v10.i2.109-113

Abstract

A gear is a part of a machine that has a very complex shape so that it requires special care and expertise in the manufacturing process. Powder metallurgy offers an efficient manufacturing process for the production of these complex machining parts. In this study, Cr metal powder was selected to increase the hardness properties of spur gears made from iron (Fe) powder. Doping Cr by 0%; 0.5%; 10%, 1.5% and 2.0% will be added in gear manufacturing. Water is used as a binder with a ratio of 1:15 which is then packed by 15,000 kg or 15 tons then heated or sintered at a temperature of 1200 oC for 1 hour. The shrinkage ratio of the sample to the sintering treatment averaged 4.6%. 0.2 kg of load applied to the Vickers hardness test. Vickers hardness values ​​obtained were 60, 77, 90, 184 and 211 respectively for the Cr doping of 0%; 0.5%; 10%, 1.5% and 2.0%. From these data it is found that the addition of the element Cr increases the hardness properties of iron gears. The hardness value shown is still too small, this is because there is still a lot of porosity generated in the sintering process because it is not in a vacuum condition.
Perancangan Alat Stir Casting untuk Proses Pembuatan Komposit Matriks Aluminium dengan Saluran Penuangan Suryanto Petrus Pintubatu; Slamet Sutjipto; Suyitno Suyitno
Prosiding Industrial Research Workshop and National Seminar Vol 11 No 1 (2020): Prosiding 11th Industrial Research Workshop and National Seminar (IRWNS)
Publisher : Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (945.975 KB) | DOI: 10.35313/irwns.v11i1.1976

Abstract

Kebutuhan akan material baru untuk pengecoran (casting) dengan sifat unggul seperti aluminium komposit semakin banyak. Untuk menghasilkan aluminium komposit dapat menggunakan metoda stir casting. Proses stir casting terdiri dari proses peleburan dan juga penggabungan material dengan cara pengadukan. Perancangan alat stir casting ini menggunakan metoda Pahl and Beitz yang terdiri dari tahapan perencanaan, perancangan konsep, perancangan detail, dan dokumentasi. Alat stir casting yang dirancang menggunakan crucible yang daya tampungnya 10 kg. Elemen pemanas yang digunakan sebagai sumber daya untuk peleburan, dapat diatur temperaturnya mulai dari 600 0C s/d 1200 0C. Media yang digunakan sebagai penggabungan material ketika berbentuk cairan merupakan sebuah stir road yang sumber gerakannya berasal dari sebuah motor listrik dengan putaran minimum 200 RPM s/d 1000 RPM. Dirancang juga reinforcement hoper sebagai media untuk memasukkan material capuran ke dalam crucible, dan juga saluran penuangan sebagai saluran pengeluaran material baru yang sudah terbentuk. Saluran ini nantinya akan terhubung langsung dengan cetakan untuk casting.
Studi Proses Austempering dan Tempering Baja AISI 1095 Terhadap Struktur Mikro dan Kekerasan Slamet Sutjipto
Prosiding Industrial Research Workshop and National Seminar Vol 11 No 1 (2020): Prosiding 11th Industrial Research Workshop and National Seminar (IRWNS)
Publisher : Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (700.518 KB) | DOI: 10.35313/irwns.v11i1.2100

Abstract

Baja AISI 1095 untuk komponen kendaraan seperti baut, gear, pulli dan beberapa komponen lainnya, memiliki mampu keras dan ketahanan aus yang baik. Sifat mekanik ini dapat di tingkatkan dilakukan melaluhi proses perlakuan panas seperti hardening, austempering, dan tempering. Proses hardening adalah proses pemanasan pada suhu austenisasi (γ) dilanjutkan pendinginan cepat dengan media air sehingga austenit akan bertransformasi martensite (M). Pemanasan austempering pada suhu austenisasi disertai pendinginan cepat (quenching) mengggunakan media garam cair pada temperatur antara 200oC s.d 400oC atau di atas martensite start (Ms) sehingga austenite bertransformasi menjadi bainite. Proses tempering adalah proses pemanasan kembali hasil pengerasan baja (hardening) untuk menghasilkan sifat mekanik baru. Komparasi kekerasan hasil annealing, pendinginan cepat (quenching) menujukkan 26,4 HRC dengan struktur mikro austenit dan perlit sedangkan hasil pendinginan cepat memiliki kekerasan 68,6 HRC dengan sturuk mikro austenit sisa dan maertensite. Austempering 350oC (53,4HRC); 400oC(49,8 HRC); 450oC(44,4 HRC); 500oC(43,5 HRC). Tempering 350oC(55,3 HRC); 400oC(49,5 HRC) 450oC(44,4 HRC); 500oC(43,5 HRC).
Pengaruh Variasi Temperatur Proses Austempering Terhadap Mikrostruktur dan Sifat Mekanik Baja Armour Slamet Sutjipto; Ilham Azmy; Destri Muliastri; Devi Eka Septiyani Arifin
Manutech : Jurnal Teknologi Manufaktur Vol. 15 No. 01 (2023): Manutech: Jurnal Teknologi Manufaktur
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33504/manutech.v15i01.264

Abstract

Armour steel is a medium-carbon steel which is widely used in military and defense industries owing to its ability to protect from projectile and bullet pressure. However, this armour steel still posses mechanical limitation aspect, thus it is needed to engineer for improvement. Therefore, the aim of this research is to undergo mechanical properties engineering by using heat treatment method of austempering within temperature variations of 200, 250, 350, 450, and 500 oC . Experimental results show that austempering process affected to fraction quantity of phase and microstructure of ferrite, pearlite, and bainite. Armour steel resulted by austempering process in temperature 500 oC depicts microstructure transformation and mechanical properties improvement significantly. Microstructure transformation along with proportional fraction volume phases of upper bainite, ferrite, and pearlite highly beneficial to increase impact strength dan ductility of armour steel. Thereby, armour steel resulted by austempering process in temperature 500 oC has thoroughly increased its mechanical properties which capable to be applied in military and defense industries.
Co-Authors Daniel Saragih, Albert Destri Muliastri Devi Eka Septiyani Arifin Ilham Azmy Suryanto Petrus Pintubatu Suyitno Suyitno