scholarly journals PERBANDINGAN KUALITAS MATERIAL BEARING MERK SKF, FMB, NKK, DAN JAL TERHADAP TERHADAP SIFAT FISIS DAN MEKANIS

2017 ◽  
Vol 18 (2) ◽  
Author(s):  
Masyrukan Masyrukan ◽  
Ngafwan Ngafwan ◽  
Taufik Surya Nugroho
Keyword(s):  
Surface Roughness ◽  
Vickers Hardness ◽  
Ball Bearing ◽  
Hardness Testing ◽  
Test Analysis ◽  
Hardness Tester ◽  
Microstructure Observation ◽  
Materials Used ◽  
Working Parameters

ABSTRAK Penelitian ini bertujuan untuk mengetahui kualitas bahan yang digunakan pada empat merk bearing (SKF, FMB, NKK, dan JAL) berdasarkan data-data pengujian sifat- sifat mekanik serta struktur intern (struktur mikro) pada benda uji tersebut dan dapat membandingkan ketahanan dan kekuatan keempat merk bearing tersebut berdasarkan analisis pengujian terhadap kegunaannya. Pengujian yang dilakukan meliputi pengujian kekerasan menggunakan alat Micro Vickers Hardness Tester, pengamatan struktur mikro menggunakan alat Olympus Metallurgical Microscope dan Olympus Phtomicrographics Systems, serta pengujian kekasaran permukaan menggunakan alat Surfcorder. Pengujian kekerasan maupun struktur mikro dilakukan pada bagian cincin luar bantalan (outer bearing) dan ball bearing. Sedangkan pengujian kekasaran permukaan hanya pada bagian outer bearing. Setelah dilakukan semua pengujian dapat disimpulkan bahwa berdasarkan kekuatan, kekerasan (ketahanan aus) serta kekasaran permukaan pada bagian outer bearing dan ball bearing maka merk yang memenuhi kualitas optimum adalah merk FMB karena sudah mencukupi dengan parameter kerja bantalan sehingga membuat umur pakai lebih panjang pada aspek penggunaan yang sama. Kata kunci: bearing, kekerasan, struktur mikro, kekasaran permukaan ABSTRACT This study aims to determine the quality of materials used in four bearing brands (SKF, FMB, NKK, and JAL) based on data testing of mechanical properties as well as internal structure (micro structure) on the specimens and can compare the endurance and the strength of the four brands bearings based on the test analysis of its usefulness. The tests include hardness testing using the Micro Vickers Hardness Tester tool, microstructure observation using Olympus Metallurgical Microscope and Olympus Phtomicrographics Systems, and surface roughness testing using Surfcorder tool. Hardness testing and microstructure are performed on outer bearing and ball bearing parts. While the surface roughness testing only on the outer bearing. After all tests, it can be concluded that based on strength, hardness (wear resistance) and surface roughness on outer bearing and ball bearings, the brand that meets the optimum quality is the FMB brand because it is sufficient with the bearing working parameters that make longer life on the same aspect of use. Keywords: bearing, strengthness, microstructure, surface roughness

scholarly journals Comparison of Hardness and Surface Roughness of Two Denture bases Polymerized by Different Methods

2012 ◽  
Vol 3 (2) ◽  
pp. 171-175 ◽  
Author(s):  
Farideh Bahrani ◽  
Mahroo Vojdani ◽  
Anahita Safari ◽  
Ghasem Karampoor
Keyword(s):  
Mechanical Property ◽  
Surface Roughness ◽  
Injection Molding ◽  
Vickers Hardness ◽  
T Test ◽  
Hardness Testing ◽  
Denture Base ◽  
Hardness Tester ◽  
Base Materials ◽  
Acrylic Resins

ABSTRACT Purpose The aim of this study was to evaluate mechanical property hardness and surface roughness (Ra) of different polymerization acrylic resins used for denture bases. Materials and methods A total of 30 specimens were prepared and divided in two groups. A total of 15 samples were processed by the compression molding technique using Meliodent (heatcured). Another 15 samples were processed with cold-cured resin Futura Gen via the injection molding technique. Hardness testing was conducted using a Vickers hardness tester. The Ra test was performed by a profilometer. Data were analyzed using the independent sample t-test and differences were statistically significant at the 0.05 level. Results The Vickers hardness numbers (VHN) were 20.8 ± 2.39 for Meliodent and 21.18 ± 1.42 for FuturaGen, which was not significantly different (p > 0.05). The Ra of Meliodent was 0.92 ± 0.23 µm and for FuturaGen it was 0.84 ± 0.37 µm. There were no significant changes in roughness. Conclusion The hardness and Ra of Meliodent and FuturaGen were not significantly different. Therefore, we recommend the use of FuturaGen for manufacturing denture base materials. How to cite this article Bahrani F, Safari A, Vojdani M, Karampoor G. Comparison of Hardness and Surface Roughness of Two Denture bases Polymerized by Different Methods. World J Dent 2012;3(2):171-175.

Effect of Spheroidizing Annealing Time on Microstructure and Hardness of GCr15 Bearing Steel

2012 ◽  
Vol 581-582 ◽  
pp. 928-931 ◽  
Author(s):  
Xiang Dong Huo ◽  
Lin Guo ◽  
Kuang Nian He ◽  
Rui Huang
Keyword(s):  
Particle Size ◽  
Vickers Hardness ◽  
Annealing Time ◽  
Bearing Steel ◽  
Hardness Tester ◽  
Prolonged Time ◽  
Gcr15 Bearing Steel ◽  
Microstructural Constituent ◽  
Spheroidizing Annealing

In order to shorten the spheroidizing annealing time, the effects of annealing time on microstructure and hardness of GCr15 have been researched by using OM, SEM and Vickers hardness tester. The original microstructural constituent of bearing steel is pearlite and cementite. Prolonged time at 805°Cwill decrease the number and increase size of cementite particles. After incomplete austenization at 805°C, prolonged time at 720°C induces increase of particle size, and uniform distribution of divorced pearlite. The hardness of specimens treated with different spheroidization process fluctuates around 200HV, and is equivalent to that with conventional spheroidization process. It is realizable to shorten the annealing time on the premise of good quality of bearing steel.

scholarly journals PENGARUH PENAMBAHAN ALUMINIUM OKSIDA PADA BAHAN BASIS GIGI TIRUAN RESIN AKRILIK POLIMERISASI PANAS TERHADAP KEKERASAN DAN KEKASARAN PERMUKAAN

2019 ◽  
Vol 6 (1) ◽  
pp. 1-8
Author(s):  
Mahrizka Desi Ory Lubis ◽  
Dwi Tjahyaning Putranti
Keyword(s):  
Surface Roughness ◽  
Vickers Hardness ◽  
Hardness Tester

Pendahuluan : Resin akrilik polimerisasi panas (RAPP) masih menjadi bahan basis gigi tiruan yang paling sering digunakan. RAPP memiliki estetis yang baik, proses pembuatan yang mudah diperbaiki, mudah dalam proses pembuatan, dan harga relatif murah. Meskipun demikian, RAPP memiliki sifat mekanis yang rendah yaitu kekerasan dan sifat fisis yang penting seperti kekasaran permukaan, sehingga diperlukan  modifikasi dengan menambahkan bahan penguat berupa aluminium oksida (Al2O3) atau alumina. Tujuan penelitian untuk menganalisis pengaruh penambahan aluminium oksida pada bahan basis gigi tiruan RAPP terhadap kekerasan dan kekasaran permukaan. Metode : Rancangan penelitian ini adalah eksperimental laboratoris dengan 24 sampel berukuran 60 mm x 10 mm x 3 mm dengan konsentrasi kontrol, 7,5%, 10%, 15%. Kekerasan sampel kemudian di uji menggunakan Vickers Hardness Tester dan 24 sampel berukuran 80 mm x 10 mm x 3 mm dengan konsentrasi kontrol, 7,5%, 10, 15%  untuk kekasaran permukaan kemudian diuji menggunakan  Surface Roughness Tester. Data analisis dengan uji T independen Hasil : Nilai kekerasan kelompok kontrol dan ketiga kelompok perlakuan penambahan aluminium oksida 7,5%, 10%, 15% berturut-turut adalah 15,551 VHN, 19,339 VHN, 25,505 VHN, dan 30,394 VHN; Sedangkan nilai kekasaran  permukaan kelompok kontrol dan ketiga kelompok perlakuan penambahan aluminium oksida 7,5%, 10%, 15% berturut-turut adalah 0,189 µm, 0,221 µm, 0,271 µm dan 0,308 µm. Penambahan bubuk aluminium oksida pada RAPP dapat meningkatkan kekerasan dan kekasaran permukaan secara signifikan (p=0,0001 (p<0,05)),  Simpulan : Penambahan aluminium oksida pada bahan basis gigi tiruan resin akrilik polimerisasi panas berpengaruh dalam meningkatkan kekerasan dan meningkatkan kekasaran permukaan yang masih dapat diterima pada konsentrasi 7,5%.

TO THE QUESTION ABOUT THE CONTROL SURFACES, FORMED ON A CNC MACHINE

2019 ◽  
pp. 52-59
Author(s):  
B. Ya. Mokritskii
Keyword(s):  
Surface Roughness ◽  
Initial Data ◽  
Machine Building ◽  
Cnc Machine ◽  
Machine Model ◽  
Current Production ◽  
Materials Used ◽  
Band Saw ◽  
Control Surfaces

Investigated the quality of the surfaces obtained on the CNC machine model HBS-1319V. Used in the actual production situation of the company "Technopark" at school. The model of the band saw machine, the types of saws used on it, the brands of materials used are accepted as the initial data of the current production. The problem of quality management (through surface roughness and other parameters) of formed surfaces of blanks by developing technical and organizational solutions aimed at reducing the size of allowances for subsequent finishing of the workpiece is considered. This task is also relevant to perform dimensional grooves in the workpiece. Analysis of the problem showed that the issues of metrological support for the operations of procurement industries of machine-building enterprises are not raised. There is no methodological and instrument base for this stage of production. This also applies to the blank production with band saw machines. Results of control of surfaces depending on conditions of their reception and depending on the used means of control are resulted.

KAMPÜS İÇİ ULAŞIMDA ALTERNATİF SEÇİMLER: KARABÜK ÜNİVERSİTESİ ÖRNEĞİ

2015 ◽  
Vol 2 (3) ◽  
Author(s):  
Rukiye Tekin ◽  
Metin Kılıç
Keyword(s):  
Quality Of Life ◽  
Economic Structure ◽  
Survey Study ◽  
City Image ◽  
Test Analysis ◽  
Level Of Education ◽  
University Campuses ◽  
Effective Administration ◽  
Demographic Features

The contribution of universities to economic structure, social and physical insfrastructure, the quality of life and city, and the level of education cannot be regarded. Therefore, it should be provided that university campuses should be areas which reflect city image with their physical structures. In this regard, the effective administration, usage, and development of universities, and the coordination between the units of universities should also be provided. One of the most significant elements of this coordination and cooperation is on campus transportation. One of the main purposes of the thesis is to evaluate inner campus transportation which is the sub-unit of city transportation. Other purposes are to determine the reasons of the perception of the users in reference to their demographic features on campus transportation and the reasons of their preferences of a particular transportation option. A survey study has been conducted in order to measure inner campus transportation perceptions. In this regard, 1112 questionnaire forms have been analysed by the software programme of SPSS. Expression analysis of the reliability, frequency distribution and factors are obtained, and differences were identified by ANOVA and T-TEST analysis.

Improving of quality of gate assembly contact surfaces of high-pressure fi ttings by diamond burnishing

2020 ◽  
pp. 99-104
Author(s):  
S.A. Zaydes ◽  
A.N. Mashukov ◽  
T.Ya. Druzhinina
Keyword(s):  
Surface Roughness ◽  
High Pressure ◽  
Main Part ◽  
Conical Surface ◽  
The Real ◽  
Metal Seal ◽  
Diamond Burnishing ◽  
Air Tightness ◽  
Contact Surfaces

The contact belt of the gate assembly is the main part of high pressure fittings. The serviceability of the fittings assembly as whole depends on the air-tightness and quality of the mating surfaces. The technology of diamond burnishing allows to increase the interface of the nodes by red ucing the surface roughness of the metal-to-metal seal. The real experience for improving of the fittings contact belt due to the use of diamond burnishing of the nozzles seats and the conical surface of the rods.

CUIDADOS BUCAIS EM PACIENTES VENTILADOS MECANICAMENTE: CONHECIMENTO DE ENFERMEIROS DE UM HOSPITAL ESCOLA

2018 ◽  
Vol 8 (4) ◽  
Author(s):  
Gérsica Sampaio Silva ◽  
Fernanda Alves Ferreira Gonçalves ◽  
Bárbara Ribeiro Miquelin Bueno ◽  
Georlucya Kátia Da Silva Ferreira ◽  
Ludmila Pinheiro Da Silva ◽  
...  
Keyword(s):  
Oral Hygiene ◽  
Oral Care ◽  
Cross Sectional Study ◽  
Cross Sectional ◽  
Mechanically Ventilated ◽  
Mechanically Ventilated Patients ◽  
Complicating Factors ◽  
Materials Used ◽  
Ventilated Patients

Objetivo: Avaliar o conhecimento acerca dos cuidados bucais realizados por enfermeiros a pacientes ventilados mecanicamente. Método: Estudo transversal, realizado em um hospital escola de Goiânia/Goiás. A coleta de dados deu-se por meio de questionário estruturado. Resultados: Os enfermeiros conhecem as medidas recomendadas sobre higiene bucal. Os fatores dificultadores encontrados foram a falta de pessoal (21,7%), falta de tempo (16,7%) e trabalhos burocráticos (15%). Contudo ainda existem lacunas no que se refere a produtos e materiais utilizados na higiene bucal. Conclusão: As Lacunas e os fatores dificultadores sinalizados nesse estudo merecem reflexão, como forma de avaliar a qualidade do cuidado oferecido.Descritores: Biofilme; Higiene Bucal; Cuidados de enfermagem.ORAL CARE IN MECHANICALLY VENTILATED PATIENTS: KNOWLEDGE OF NURSES FROM A SCHOOL HOSPITALObjective: To evaluate the knowledge about oral care performed by nurses in mechanically ventilated patients. Methods: a cross-sectional study, conducted in a teaching hospital of Goiania/Goias. The data collection was performed by means of a structured questionnaire. Results: The nurses know the measures recommended on oral hygiene. The complicating factors found were the lack of personnel (21.7%), lack of time (16.7%) and work on tape (15%). However there are still gaps in relation to products and materials used in oral hygiene. Conclusion: The gaps and the factors complicating factors indicated in this study deserve consideration, as a means of evaluating the quality of care offered.Keywords: Biofilm; Oral hygiene; Nursing care.CUIDADO ORAL EN PACIENTES CON VENTILACIÓN MECÁNICA: EL CONOCIMIENTO DE LAS ENFERMERAS DEL HOSPITAL ESCUELAObjetivo: Evaluar el conocimiento sobre el cuidado bucal realizadas por enfermeras en pacientes ventilados mecánicamente. Métodos: Estudio transversal, realizado en un hospital de Goiania y Goias. La recolección de datos se realizó por medio de un cuestionario estructurado. Resultados: Las enfermeras saben las medidas recomendadas en la higiene bucal. Los factores encontrados fueron la falta de personal (21,7%), la falta de tiempo (16,7%) y trabajar en la cinta (15%). Sin embargo todavía hay lagunas en relación con los productos y los materiales utilizados en la higiene bucal. Conclusión: Las brechas y los factores factores indicados en este estudio merecen consideración, como medio de evaluar la calidad de la atención ofrecida.Palabras clave: Biofilme; Higiene Bucal; Atención de Enfermería.

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