Término solicitado: SANCHEZ EGEA, ANTONIO J./(22)
4 Registro/s encontrado/s en CAT+NORMA
| Tipo de Docum.: | artículo |
| Título: | Correlating dry wear turning and pin‑on‑disc tests: a cost‑effective approach to machinability evaluation for low carbon steel grades |
| Autor: | Martínez Krahmer, Daniel; Martynenko, Vitaliy; Pereyra Osenda, Alberto; Sánchez Egea, Antonio J. |
| Título Ser./Col.: | Journal of the Brazilian Society of Mechanical Sciences and Engineering, 45(647) |
| Idioma: | eng |
| Datos de Edición: | s.l. Springer. 2023. |
| Pág./Vol.: | 9p.: tbls.; grafs.; fot.; il. |
| Descriptores: | Maquinabilidad; Aceros; Abrasión; Resistencia a la abrasión |
| Resumen: | Machinability tests play a crucial role in the metalworking industry despite their inherent cost and time requirements. This study aims to introduce a novel approach by establishing a correlation between the dry wear turning and pin-on-disc tests, potentially enabling their interchangeability. The industry is particularly interested in this challenge due to the simplifed implementation and reduced costs and time compared to the conventional turning test. The correlation between the dry wear turning and pin-on-disc tests was investigated using three low carbon steel grades (12L14, 1212, and 1018) and three medium cutting speeds (150, 180, and 240 m/min). Additionally, a comprehensive cost-energy comparison is conducted to underscore the signifcance of identifying a laboratory test equivalent to the traditional machinability test. The obtained results reveal a strong correlation between both wear tests. Furthermore, the relative cost analysis demonstrates that the pin-on-disc test costs only 14% of the long-duration turning test, emphasizing its cost-efectiveness. |
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URL: |
https://doi.org/10.1007/s40430-023-04550-x |
| Tipo de Docum.: | artículo |
| Título: | Reduction of die wear and structural defects of railway screw spike heads estimated by FEM |
| Autor: | Alcázar, Jackeline; Abate, Germán; Antunez, Nazareno; Simoncelli, Alejandro; Sánchez Egea, Antonio J.; Martinez Krahmer, Daniel; López de Lacalle, Norberto |
| Título Ser./Col.: | Nanomaterials, 11(11) |
| Autor Inst. Ser./Col.: | Multidisciplinary Digital Publishing Institute. MDPI. Basilea. Suiza |
| Idioma: | eng |
| Datos de Edición: | s.l. MDPI. 2021. |
| Pág./Vol.: | 11p. |
| Unidad técnica: | INTI-Mecánica. |
| Descriptores: | Biosensores; Métodos electroquímicos; Impresiones; Tintas; Nanotubos de carbono; Nanopartículas; Silicio |
| Resumen: | Railway spike screws are manufactured by hot forging on a massive scale, due to each kilometer of railway track needing 8600 spike screws. These components have a low market value, so the head must be formed in a single die stroke. The service life of the dies is directly related to the amount of energy required to form a single screw. The existing standard for spike screws specifies only the required tolerances for the head dimensions, particularly the angle of the hub faces and the radius of agreement of the hub with the cap. Both geometrical variables of the head and process conditions (as-received material diameter and flash thickness) are critical parameters in spike production. This work focuses on minimizing the energy required for forming the head of a railway spike screw by computational simulation. The variables with the highest degree of incidence on the energy, forging load, and filling of the die are ordered statistically. The results show that flash thickness is the variable with the most significant influence on forming energy and forming load, as well as on die filling. Specifically, the minimum forming energy was obtained for combining of a hub wall angle of 1.3◦ an as-received material diameter of 23.54 mm and a flash thickness of 2.25 mm. Flash thickness generates a lack of filling at the top vertices of the hub, although this defect does not affect the functionality of the part or its serviceability. Finally, the wear is mainly concentrated on the die splice radii, where the highest contact pressure is concentrated according to the computational simulation results. |
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Trabajo de INTI |
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URL: |
https://www.mdpi.com/2075-4701/11/11/1834/ |
| Tipo de Docum.: | artículo |
| Título: | Sliding abrasive wear when combining WEDM conditions and polishing treatment on H13 disks over 1045 carbon steel pins |
| Autor: | Sánchez Egea, Antonio J.; Martynenko, Vitaliy; Simoncelli, Alejandro; Serrancoli, Gil; Martínez Krahmer, Daniel |
| Título Ser./Col.: | The International Journal of Advanced Manufacturing Technology, 116(5-6) |
| Idioma: | eng |
| Datos de Edición: | s.l. Springer. 2021. |
| Pág./Vol.: | 11p. |
| Unidad técnica: | INTI-Mecánica. |
| Descriptores: | Superficies; Latón; Aceros; Nitruración; Nitrógeno; Plasma; Calidad; Desgaste; Fricción |
| Resumen: | Forging dies are crucial in forging to manufacture accurate workpieces. These dies are generally made of AISI H steel series and hardened and tempered medium carbon alloy steel. Dies are processed by using high-speed milling + polishing or electrical discharge machining + polishing. The surface quality of the workpiece depends on the surface properties of these dies, where surface roughness, material hardness, and wear evolution of their surfaces are critical aspects to consider. This research analyzes different wire electrical discharge machining surface conditions combined with polishing treatment to describe their influence on friction and wear. Wire electrical discharge machining defines the disks’ surface properties in finishing and roughing conditions, and polishing treatment varies in time and paper sand depending on the roughness. Abbott-Firestone curves and Rsk-Rku roughness parameters characterize the surface roughness of each studied configuration. Room temperature pin-on-disk tests were performed to analyze friction coefficients and wear rate for AISI 1045 pins and AISI H13 disks. On average, the highest (0.284) and the lowest (0.201) friction coefficients were found for the combination of finishing wire electrical discharge machining + polishing and roughing wire electrical discharge machining conditions, respectively. Scanning electron microscope images were taken to describe the wear tracks and pin degradation for different sliding abrasive configurations. The diagram correlating the surface morphology and the friction coefficient predicts the wear damage on initial surface conditions, which is crucial in the forging industry to determine tool maintenance or replacement. |
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Trabajo de INTI |
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URL: |
https://link.springer.com/article/10.1007%2Fs00170-021-07897-4 |
| Tipo de Docum.: | artículo |
| Título: | Surface damaging of brass and steel pins when sliding over nitrided samples cut by finishing and roughing EDM conditions |
| Autor: | Martynenko, Vitaliy; Martínez Krahmer, Daniel; Nápoles Alberro, Amelia; Cabo, Amado; Pérez, Daniela; Zayas Figueras, Enrique E.; Gonzalez Rojas, Hernán A.; Sánchez Egea, Antonio J. |
| Título Ser./Col.: | Materials, 13(14) |
| Autor Inst. Ser./Col.: | Multidisciplinary Digital Publishing Institute. MDPI. Basilea. CH |
| Idioma: | eng |
| Datos de Edición: | s.l. MDPI. 2020. |
| Pág./Vol.: | 10p. |
| Unidad técnica: | INTI-Mecánica. |
| Descriptores: | Superficies; Latón; Aceros; Nitruración; Nitrógeno; Plasma; Calidad; Desgaste; Fricción |
| Resumen: | In the forging industry, surface quality and surface treatments of dies are crucial parameters to extend their life. These components are usually machined by milling or by Electrical Discharge Machining (EDM), and the final surface roughness depends on the machining techniques and operational conditions used in its fabrication. After milling, a nitriding treatment is widely applied to extend its service life. Nevertheless, no scientific report that informs about nitriding after EDM has been found. Accordingly, this work focuses on the wear and friction behavior of pins made of brass and medium carbon steel sliding over AISI H13 discs, made by wire EDM in the conditions of finishing and roughing. The discs are plasma nitride, and their effect on the wear during pin-on-disc tests is evaluated. In this sense, the analysis of the surface damage for the different pins will help us to understand the service life and wear evolution of the forging dies. The results show that plasma nitride reduces the friction and prevents the degradation of the pin, independently of the material of the pin, when sliding over finishing and roughing EDM conditions. |
| Ver Documento
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Trabajo de INTI |
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URL: |
https://www.mdpi.com/1996-1944/13/14/3199 |
Fin
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