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COMPARISON OF SURFACE CHARACTERISTICS OF MEDICAL-GRADE 316L STAINLESS STEEL PROCESSED BY SAND-BLASTING, SLAG BALL-BLASTING AND SHOT-BLASTING TREATMENTS Arifvianto, Budi; Mahardika, Muslim; Salim, Urip Agus; Suyitno, Suyitno
Journal of Engineering and Technological Sciences Vol 52, No 1 (2020)
Publisher : ITB Journal Publisher, LPPM ITB

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

In this research, a comparative study was carried out to examine the surface characteristics of medical-grade 316L stainless steel after blasting treatments by using angular silica particles, spherical slag balls and spherical metallic shot. The surface roughness, morphology, elemental composition and microhardness distribution of the stainless steel were determined and the possible mechanisms in the evolution of the surface characteristics of the steel exposed to the blasting treatments were established. The results showed that all the blasting treatments conducted in this research increased the roughness and hardness of the steel surface. In this case, the roughest stainless steel surface was achieved by the slag ball-blasting treatment, but the stainless steel with the hardest surface and the thickest hard subsurface layer was obtained by the shot-blasting treatment. On the basis of the findings in this research it can be concluded that the physical properties and surface morphology of particles or shot used in the blasting treatment are critical parameters in determining the surface characteristics of blasted stainless steel.

Comparison of Surface Characteristics of Medical-grade 316L Stainless Steel Processed by Sand-blasting, Slag Ball-blasting and Shot-blasting Treatments Budi Arifvianto; Muslim Mahardika; Urip Agus Salim; Suyitno Suyitno
Journal of Engineering and Technological Sciences Vol. 52 No. 1 (2020)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2020.52.1.1

In this research, a comparative study was carried out to examine the surface characteristics of medical-grade 316L stainless steel after blasting treatments by using angular silica particles, spherical slag balls and spherical metallic shot. The surface roughness, morphology, elemental composition and microhardness distribution of the stainless steel were determined and the possible mechanisms in the evolution of the surface characteristics of the steel exposed to the blasting treatments were established. The results showed that all the blasting treatments conducted in this research increased the roughness and hardness of the steel surface. In this case, the roughest stainless steel surface was achieved by the slag ball-blasting treatment, but the stainless steel with the hardest surface and the thickest hard subsurface layer was obtained by the shot-blasting treatment. On the basis of the findings in this research it can be concluded that the physical properties and surface morphology of particles or shot used in the blasting treatment are critical parameters in determining the surface characteristics of blasted stainless steel.

Aplikasi Cetakan Permanen untuk Meningkatkan Produksi dan Kualitas Produk IKM Pengecoran Logam Kuningan di Ngawen, Sidokarto, Godean, Yogyakarta Suyitno Suyitno; Urip Agus Salim; Muslim Mahardika
Jurnal Pengabdian kepada Masyarakat (Indonesian Journal of Community Engagement) Vol 2, No 1 (2016): September
Publisher : Direktorat Pengabdian kepada Masyarakat Universitas Gadjah Mada

Small and Medium Enterprises (SME) brass foundry in Ngawen Sidokarto, District of Godean, Sleman, Yogyakarta mostly produced cow necklace accessories (klonthong) and jathilan accessories (klinthing). Te industry and business management are arranged within the scope of family. Te products are relatively low in quality and its market share is limited and tend to be traditional. Tis condition is caused by the weak knowledge of the management and the method of casting metals and metal science. Brass casting methode, that was used at IKM partner, is casting with mold of sand or soil. Tis process requires the making process of sand molds, that is removed afer the brass solidify. For large quantities products, this process is inefcient and takes a long time. It would require a more efcient and faster method in the production process. Method of sand casting and ceramics have been used by SMEs cast brass in Yogyakarta, however it has many disadvantages in terms of increased productivity and quality as well as the expansion of product applications. Te permanent mold casting of iron is a casting method which has many advantages over other methods, but the use for SMEs has not been applied in the SME of cast brass. Te permanen mold casting methods was introduced to SME partners. Tis replaces the sand mold materials and molding sand. It is expected the casting process is faster because the mold can be used for a large number of products. Te results show that the application of the technology results in products with precision and consistent in shape and size. Community Service of UGM with Appropriate Technology has also collaborated with Industry and Trade service of Yogyakarta donation of production machinery for making permanent mold. It can be concluded that the application of permanen mold in the brass foundry industry improve the product precision and the speed of produsction.

Pemodelan CAD 3D Tulang Femur dari data CT Scan Urip Agus Salim; Fahdilla Rizky
Journal of Mechanical Design and Testing Vol 1, No 1 (2019): Articles
Publisher : Departemen Teknik Mesin dan Industri, Universitas Gadjah Mada

Rekontruksi tulang yang diawali dengan pembacaan tampilan 2D dari CT-Scan merupakan metode yang sudah lazim dilakukan oleh dokter bedah ortopedi. Tindakan ini merupakan bagian dari perencanaan sebelum operasi (preoperative planning). Salah satu tujuan tindakan ini adalah untuk menentukan jenis dan ukuran implan tulang tiruan. Pembacaan tampilan dari 2D dari CT-scan semata memungkinkan terjadi kesalahan intepretasi terhadap bentuk tulang karena ada bagian geometri tulang di belakang tampilan yang tidak jelas. Hanya dengan tampilan 2D saja, dokter bedah juga tidak bisa melakukan proses penyesuaian (fitting) implan template. Fitting implan template akan menjadi lebih mudah jika dilakukan menggunakan piranti lunak yang biasa digunakan untuk perancangan dengan CAD. Oleh karena itu pemodelan dari data CT-scan menjadi bentuk model solid 3D menjadi perlu dilakukan. Tulisan ini bisa memberikan prosedur yang dapat digunakan untuk memodelkan tulang dari data CT-scan sehingga menjadi bentuk model CAD 3D. Dengan model CAD 3D maka dokter bedah dapat melakukan proses fitting implan template dengan baik. Disisi lain, desainer dapat merancang implan tulang pasien secara personal.

The effect of AA5083H116 2-layer MIG welding speed on physical and mechanical properties M Mudjijana; Viktor Malau; Urip Agus Salim
Journal of Material Processing and Characterization Vol 1, No 1 (2020): Articles
Publisher : Departmen Teknik Mesin dan Industri, Fakultas Teknik, Universitas Gadjah Mada

Metal welding can be performed on 1 layer or more depending on the thickness of the plate welded. In the case of 3-mm-thick plates, high-efficiency welding can be carried out on 1 layer if appropriate welding speed, voltage, and amperage are applied. If two layers are to be used, sound weld of 3-mm-thick plates can be achieved if higher welding speed and lower voltage and amperage are applied. This research was intended to conduct 2-layer MIG weld works at welding speeds of ≥10, 13, and 16 mm/s in accordance with previous research studies and to analyze the physical and mechanical properties generated. This research employed the AA5083H116 material, ER5356 electrode, and argon gas. During the welding processes, the thermal cycles were recorded, and after the processes, the welding results were observed for the macro- and microstructures and for the optimal welding speed under an SEM. In addition, tensile tests, Vickers microhardness tests, and corrosion tests were also undertaken. The results show that the 2-layer MIG welding at the welding speed of 10 mm/s produced the best physical and mechanical properties.

Pengaruh variasi parameter cetak dan post process terhadap tingkat kekerasan spesimen hasil cetak tiga dimensi berbasis stereolithography (SLA) Aris Sandi; Muslim Mahardika; Sukmaji Indro Cahyono; Urip Agus Salim; Juan Pratama; Budi Arifvianto
SENATIK STT Adisutjipto Vol 7 (2022): Generation Z's Participation in Aerospace
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/senatik.v7i0.454

Keunggulan 3D printing stereolithography (SLA) dalam mencetak spesimen dengan geometri yang komplek dan kekasaran permukaan yang rendah menjadikan teknologi ini semakin banyak digunakan di berbagai bidang. Terlepas dari keunggulan yang dimiliki, sifat mekanis spesimen hasil cetak SLA yang rendah menjadi salah satu kekurangan utamanya. Dari beberapa penelitian telah dilakukan pengujian mekanis yang menunjukkan bahwa parameter cetak mempengaruhi sifat mekanis spesimen hasil cetak. Pada penelitian ini, pengaruh variasi parameter cetak dan post process pada kekerasan spesimen hasil cetak 3D printer SLA diteliti. Variasi parameter cetak pada penelitian ini antara lain build orientation (0o dan 90o), layer thickness (0,05, 0,1, 0,15, dan 0,2 mm), dan curing time (10, 20, 30, dan 40 menit). Hasil penelitian menunjukkan bahwa parameter cetak dan post process terbukti mempengaruhi tingkat kekerasan spesimen hasil cetak. Tingkat kekerasan tertinggi yang bernilai 87,9 Shore D didapatkan pada variasi build orientation 0° dengan layer thickness 0,05 mm dan curing time 40 menit.

Metode Pencegahan Warping dan Cacat Kualitas Permukaan Produk Fused Deposition Modelling (FDM) Danindra Brian Kusuma; Muslim Mahardika; Juan Pratama; Urip Agus Salim; Sukmaji Indro Cahyono; Budi Arifvianto
SENATIK STT Adisutjipto Vol 7 (2022): Generation Z's Participation in Aerospace
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/senatik.v7i0.455

Keunggulan 3D printing FDM (Fused Deposition Modelling) yang mampu membuat prototype dengan bentuk kompleks dalam waktu yang singkat menjadikan salah satu proses manufaktur utama dalam perindustrian otomotif, aerospace, bidang kesehatan dan masih banyak lagi. Terlepas dari kelebihan yang dimiliki FDM, proses ini memiliki kekurangan, yaitu kualitas permukaan hasil cetak yang buruk. Salah satu penyebab dari kekurangan ini adalah terjadinya fenomena warping dan cacat permukaan setelah pengambilan produk dari platform. Pada penelitian ini, dilakukan analisa pengaruh platform temperature dan penggunaan raft terhadap fenomena warping yang terjadi pada produk hasil cetak FDM. Variasi parameter cetak yang digunakan adalah platform temperature (non-heated dan 60°C), raft air gap (0,2 dan 0,4 mm), dan raft top layer (1, 2, dan 3 buah). Hasil penelitian menunjukkan bahwa penggunaan platform temperature mempengaruhi fenomena warping yang sering terjadi pada produk cetak FDM dan penggunaan raft dapat meminimalisir cacat permukaan ketika pengambilan produk dari platform FDM. Parameter cetak optimal dengan produk cetak yang sempurna dihasilkan saat penggunaaan platform temperature 60°C, raft air gap 0,4 mm, dan 1 raft top layer.

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