“Cierre y sellado de tubos de acero AISI SAE 1020 mediante torneado en caliente”
No Thumbnail Available
Date
2024-09
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Universidad Nacional de Trujillo
Abstract
El presente trabajo académico se enfoca en el estudio preliminar del proceso de
torneado en caliente con la finalidad de sellar un tubo únicamente mediante un
proceso parecido al repujado en frio. Algunos autores también le denominan termo
torneado.
La probeta utilizada fue un tubo de ½ pulg. de diámetro. El espesor de la pared del
tubo fue de 1/16”. El tubo fue un LAC. El material fue el A36 acero estructural. La
velocidad de rotación del husillo por ende la del tubo fue constante de 700 RPM. El
proceso fue llevado a cabo en el torno con una herramienta de forma de ¾” de sección
cuadrada, la cual fue la encargada de realizar el termosellado.
En los ensayos previos se reportó que con temperaturas por encima de la A1 es decir
por encima de 727ºC no se puede termoformar el tubo ya que este se rompe en la
periferia. Las temperaturas en la cual se llevó a cabo el proceso fue de 850ºC
aproximadamente obteniéndose el cierre del tubo.
Se realizaron ensayos metalográficos y se midió microdurezas en Vickers. Se reportó
que la mayor dureza fue de 239 HV. Además, hay ferrita en forma de bandas, granos
gruesos, granos finos y muchas zonas descarburizadas
The present academic research focuses on the preliminary study of the hot turning process with the purpose of sealing a tube only through a process similar to cold embossing. Some authors also call it thermo-turning. The test tube used was a ½ inch diameter tube. The tube wall thickness was 1/16”. The tube was a LAC. The material was A36 structural steel. The rotation speed of the spindle and therefore that of the tube was a constant 700 RPM. The process was carried out on the lathe with a ¾” square section tool, which was responsible for performing the heat sealing. In previous tests it was reported that with temperatures above A1, that is, above 727ºC, the tube cannot be thermoformed since it breaks at the periphery. The temperature at which the process was carried out was approximately 850 ºC, obtaining the closure of the tube. Metallographic tests were carried out and microhardnesses were measured in Vickers. The highest hardness was reported to be 239 HV. In addition, there is ferrite in the form of bands, coarse grains, fine grains and many decarburized areas.
The present academic research focuses on the preliminary study of the hot turning process with the purpose of sealing a tube only through a process similar to cold embossing. Some authors also call it thermo-turning. The test tube used was a ½ inch diameter tube. The tube wall thickness was 1/16”. The tube was a LAC. The material was A36 structural steel. The rotation speed of the spindle and therefore that of the tube was a constant 700 RPM. The process was carried out on the lathe with a ¾” square section tool, which was responsible for performing the heat sealing. In previous tests it was reported that with temperatures above A1, that is, above 727ºC, the tube cannot be thermoformed since it breaks at the periphery. The temperature at which the process was carried out was approximately 850 ºC, obtaining the closure of the tube. Metallographic tests were carried out and microhardnesses were measured in Vickers. The highest hardness was reported to be 239 HV. In addition, there is ferrite in the form of bands, coarse grains, fine grains and many decarburized areas.
Description
Keywords
TECHNOLOGY::Engineering mechanics