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Analysis of Forging Dies Coated with Tungsten Carbide through HVOF Processing

Journal of Mechanics Engineering and Automation 2016年第7期6卷 373-378页

作者： Vanessa Moura de Souza angela selau marques Jorge Antoenio Huff Alexandre da Silva Rocha Luciano Kempski GES (Group of Engineering Surface) Federated University of Rio Grande do Sul Porto Alegre Brazil

In this paper we present a performance evaluation of thermal spraying coated hot forging dies conducted in a production line. The High Velocity Oxy-Fuel process was used for the deposition of a tungsten carbide coating, which is characterized by its optimal adherence and low porosity. A metallurgical characterization of the layer was previously done, in order to obtain reference information to assist in the interpretation of the practical tests results. The coated die allowed an increase in productivity of 37.5%, besides better dimensional stability results through the process and legibility of printed numbers.

关键词： Hot forging coating die surface.

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Optimizing Hot Forging Process Parameters of Hollow Parts Using Tubular and Cylindrical Workpiece： Numerical Analysis and Experimental Validation

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Journal of Mechanics Engineering and Automation 2018年第2期8卷 60-70页

作者： angela selau marques Luana DeLuccade Costa Rafael Luciano Dalcin Alberto Moreira Guerreiro Brito Lirio Schaeffer Alexandre da Silva Rocha Faculty of Engineering Metallurgical Department Federal Universityof Rio Grande do Sul (UFRGS) Avenue Bento Goncalves 9500 Porto Alegre CEP 91509-900 Brazil

CAE （computer aided engineering） evaluates the forging process virtually to optimize the industrial production. The numerical and experimental investigations of forging process of a hollow part are important in industrial point of view. This study has been focused on the development of a 3D elastic-plastic FEM （finite element model） of hot forging to evaluate the forming process of hollow parts. The validity of this method was verified through a laboratory experiment using aluminum alloy （AA6351） with medium geometric complexity. The distributions of effective strain, temperature, metal flow and strength were analyzed for two different initial workpieces （tubular and cylindrical）. It was observed that both initial workpieces can be used to produce the final hollow part using the numerical simulation model. The results showed that the numerical analyses predict, filling cavity, calculated strength, work temperature and material flow were in agreement with the experimental results. However, some problems such as air trapping in the die causing incomplete filling could not be predicted and this problem was resolved experimentally by drilling small holes for air release in the dies.

关键词： Hot forging FEM hollow parts AA6351.

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Periprocedural management of hemostatic alterations in patients with cirrhosis and vascular liver disorders: a step forward of the American Association for the Study of Liver Diseases

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Hepatobiliary Surgery and Nutrition 2023年第1期12卷 105-109页

作者： Jose Ignacio Fortea angela Puente Javier Crespo Emilio Fabrega Gastroenterology and Hepatology Department Clinical and Translational Research in Digestive DiseasesValdecilla Research Institute(IDIVAL)Marques de Valdecilla University HospitalSantanderSpain

“Time flies over us,but leaves its shadow behind”(Nathaniel Hawthorne,1860,The Marble Faun).The shadow that separates the latest guidance on vascular liver disorders of the American Association for the Study of Liver Diseases(AASLD)from its former counterpart is 12 years long(1,2).Along the course,several guidelines from different societies have been published on this topic(3-7).As acknowledged in the preamble,the lack of high-quality evidence in the field led the AASLD to commission a guidance from an expert panel based on formal review and analysis of the *** thus differs from other guidelines that perform systematic reviews with explicit methods of searching,selection,and rating the quality of evidence and,if appropriate,meta-analysis on certain clinical questions(2).

关键词： Portal hypertension cirrhosis vascular liver disorders hemostasis bleeding thrombosis

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