The purpose of this research is to determine the effects of current variation to the cutting kerf and hardness in medium carbon steel cutting process using CNC Plasma Arc Cutting. This research uses experimental methods to study the effect of a given treatment. The electric current was varied for 20, 25, 30, 35, and 40 amps. The test parameters were cutting kerf and hardness. The data were analyzed using descriptive statistics. The test result shows that there are differences in cutting kerf and hardness. The lowest kerf and hardness value was obtained from the 20 amps current, with a kerf of 1.64 mm and a hardness of 707.4 HV. The highest kerf and hardness value were obtained from the 40 amps current test, with a kerf of 2.58 mm and a hardness of 857.7 HV. This research concludes that the variation of electric current in CNC Plasma Arc Cutting process of medium carbon steel affects the kerf (99.59%) and hardness (94.17%). Tujuan penelitian ini adalah untuk mengetahui seberapa besar variasi kuat arus memberikan pengaruh terhadap lebar pemotongan (Kerf Width) dan kekerasan pada proses pemotongan baja karbon sedang dengan menggunakan CNC Plasma Arc Cutting. Metode yang digunakan dalam penelitian ini adalah metode eksperimen dengan tujuan untuk mengetahui pengaruh sebab akibat terhadap perlakuan yang diberikan. Variasi kuat arus yang digunakan dalam proses pemotongan ini adalah 20 A, 25A, 30A, 35A, dan 40A. Pengujian yang di lakukan adalah kekerasan dan lebar pemotongan (Kerf Width). Data yang diperoleh kemudian dianalisis menggunakan teknik analisis statistik diskriptif. Hasil penelitian yang diperoleh menunjukkan bahwa terjadi perubahan nilai lebar pemotongan (Kerf Width) dan nilai kekerasan. Nilai lebar pemotongan (Kerf Width) dan kekerasan terendah diperoleh pada penggunaan arus sebesar 20 A yaitu dengan nilai lebar sebesar 1,64 mm dan kekerasan sebesar 707,4 HV. Nilai lebar pemotongan (Kerf Width) dan kekerasan tertinggi diperoleh pada penggunaan arus sebesar 40A dengan nilai lebar 2,58 mm dan kekerasan sebesar 857,7 HV. Penelitian ini dapat disimpulakan bahwa variasi kuat arus pada proses pemotongan baja karbon sedang menggunakan CNC Plasma Arc Cutting memberi pengaruh sebesar 99,59% terhadap nilai lebar pemotongan (Kerf Width) dan sebesar 94,17% terhadap nilai kekerasan.
<p>The thermal shock behavior of ceramic refractory materials is of particular interest. Refractory materials are submitted to local temperature gradients in service that originate thermal stresses and thermal shock damage to the material. However, thermal shock treatment on the refractory made from evaporation boat waste is not well documented. The purpose of this study is to determine the effect of thermal shock on the strength of refractory with various compositions. In this study, the refractory was made using 100% refractory cement (sample 1). For Sample 2, the refractory was made from a mixture of refactory cement and evaporation boats waste, each of 50%: 50%. Meanwhile, specimen 3 of the refractory is made from a mixture of refactory cement, evaporation boat waste, and silica sand of 40%: 50%: 10%, respectively. The Thermal shock treatment is carried out at a temperature range of 100 – 700<sup>o</sup>C for each specimen. The effect of thermal shock treatment on the mechanical properties of each refractory specimen was investigated using the impact and macrography test. Temperature variations in thermal shock have different effects on the level of impact strength on impact test specimens. The lowest strength was 0,012297735 J/mm<sup>2 </sup>at thermal shock 700<sup>0</sup>C in sample 3, and the highest impact strength was 0,03928934 J/mm<sup>2</sup> at 400<sup>o</sup>C thermal shock temperature in sample 2. The macrographic examination shows the higher the thermal shock temperature, the greater the fracture produced when the impact test is carried out. This is because the hardness of the refractory material increases.</p>
The purpose of this research is to study the effect of thermal shock and the composition of refractory materials on impact strength and macrostructure. The research methods are an experimental method. The independent variables in this research are thermal shock temperatures and the composition of refractory materials (a portion of alumina, rice husk ash and kaolin). The dependent variables in this research are impact strength and macrostructure. The data of this research is analyzed using descriptive statistic. The results are presented in tables, charts and images. The result shows that the highest value of average impact strength is 0,009560 J/mm2 with 300 °C temperature of thermal shock (∆T). The result of the macrostructure is a brittle structure with flat and shiny surface characteristics.Tujuan dari penelitian ini adalah mengetahui pengaruh thermal shock dan komposisi bahan refraktori terhadap kekuatan impact dan struktur makro. Metode yang digunakan pada penelitian ini merupakan metode eksperimen. Variabel bebas yang digunakan dalam penelitian ini yaitu variasi suhu thermal shock dan variasi komposisi bahan refraktori (alumina, abu sekam padi dan kaolin). variabel terikat yang digunakan dalam penelitian ini yaitu kekuatan impact dan struktur makro. Teknik analisis data yang digunakan adalah analisis deskriptif. data hasil penelitian disajikan dalam bentuk tabel, grafik dan gambar. Hasil penelitian menunjukkan bahwa rata-rata kekuatan impact tertinggi sebesar 0,009560 J/mm2 diperoleh pada komposisi 5 tanpa perlakuan thermal shock dan terendah sebesar 0,004049 J/mm2 dengan variasi suhu thermal shock (∆T) 300 oC dan hasil foto makro menunjukkan patahan getas dengan ciri-ciri permukaan patahan yang datar dan terlihat mengkilap
The purpose of the research is to find and prove the influence of machining parameters on vibration and roughness in the pocket milling process. The experimental method is used to improve the quality of products produced by CNC milling, the parameters used in the study are spindle rotation speed with variations of 300 rpm, 1200 rpm, and 3200 rpm, the depth of feed used is 2 mm and 0.5 mm. Then the test is carried out with a vibration test and surface roughness test. The data analysis technique used is descriptive statistics. The results obtained are the use of machining parameters affect the quality of the product in terms of roughness and vibration of the engine, with higher spindle rotational speed resulting in lower roughness values. The smaller the depth of feedings, the finer the roughness, then the higher the spindle rotation speed, then vibration will be lower, then the greater the depth of feed, the higher the vibration value.
The purpose of this study was to determine the effect of thermal shock and composition of graphite, kaolin (clay) on the macrostructure and impact resistance of crucible based on the waste of evaporation boats. The variation applied was composition waste of evaporation boats, graphite and kaolin 50%:25%:25%; 40%:30%:30%; 70%:15%:15%. Then the thermal shock standard temperature variation is ∆T = 100°C-500°C. Specimens formed according to the ASTM D256 size (63.5x12.7x12.7) mm with compaction load 80 kg/cm 2. Continuing the sintering process at a temperature of 1150°C holding time of 2 hours. Tests include XRD test for the waste of evaporation boats, thermal shock test, impact test and macro photo. The results showed that the highest average impact resistance is 0.01772659 Joule/mm 2 with the composition of 50%: 25%: 25% without thermal shock. The lowest average resistance impact is 0.00637474 Joule/mm 2 with the composition of 70%: 15%: 15% and 500°C thermal shock temperature. Based on the data, the higher treatment of temperature in thermal shock makes the lower impact resistance of the specimen.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.