Otimização do processo de trefilação através da proposição de um modelo de previsão da força de trefilação adequado às condições reais da V & M do Brasil

• Ano de defesa: 2013
• Autor(a) principal: Danielle Granha Giorgini
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Trefilação de tubos; Aço carbono; Força de trefilação; Engenharia metalúrgica
• Link de acesso: http://hdl.handle.net/1843/BUOS-96SJZD

One of the V & M do Brasil´s (VMB) drawing mill aims is to elaborate a suitable production process according to customer´s specification. Considering the irreversible globalization and the fierce completion for market share, companies are concerned about practices that reduce costs and increase productivity without losing quality. The present research focus on the context described above to optimize VMB´s cold drawing tubes process. To understand the necessary drawing force to form is essential to determine processing steps. The current VMB´s drawing force prediction model was proposed many years ago and futher research is recommended. The main objective of this research is to develop a drawing force prediction model adequate to the actual process conditions in VMB. Experimental measurements were taken to verify the real necessity on proposing a new model. Also, existing drawing force prediction models were evaluated and simulations were carried out using finite elements for a comparison with the current VMB model. Experimental measurements were taken on a triple cold-drawing bench at the hydraulic products line. Two normalized steel grades were chosen: SAE 1010 and DIN St 52. The drawing force measurement system was validated. Most of the obtained data for DIN St 52 steel grade are in accordance with the VMB ´s current drawing force prediction equation, considering the whole tested interval. For SAE 1010 steel grade, the concordance between data and the prediction equation was better in the area reduction range of 15% to 30%. For reductions over 30% the concordance decreases and the current model overestimates the experimental values. Regarding the analyzed models it was concluded that the developed model based on finite elements method is a better tool than analytic ones. It allows monitoring the drawing force providing results of cold drawing stresses and localized strains during the forming process.