摘要
研究摩擦因数、挤压速度和挤压锥角对模具型腔表面温升的影响,可以指导模具设计,同时为建立挤压成形过程中接触表面的温升模型奠定基础。考虑挤压成形过程中坯料的塑性变形和坯料与模具之间的剧烈摩擦与挤压模具型腔表面温升之间相互影响的工作特点,基于弹塑性力学、传热学和有限变形理论,建立挤压成形热力耦合弹塑性有限元分析模型。采用MARC软件对该模型进行热力耦合分析,研究摩擦因数、挤压速度和挤压锥角与模具型腔表面温升的关系。分析结果表明:锥角一定时,摩擦因数从0到0.1逐渐增大时,模具型腔温升随挤压速度的增加是先减小后不变再增加;挤压速度恒定时,温升随摩擦因数和锥角的增加而升高;固定摩擦因数时,挤压速度和锥角增大时,温升也增加。
The research results of the influences of extrusion cone angle, extrusion speed and friction coefficient on tem- perature rise can be used to guide mold design and lay the foundation for the establishment of temperature rise model.Dur- ing the extrusion process, the heat generated by severe friction between billet and die and the plastic deformation of billet effects the temperature rise of die cavity.Elastic-plastic finite element analysis model was established based on elastic-plas- tic mechanics, heat transfer and finite deformation theory.The model was analyzed by MARC software ,and the relationship between the coefficient of friction, extrusion speed, extrusion cone angle and temperature rise of die cavity was investigated. The analysis results shows that with the rise of extrusion speed, the three stages of the temperature rise change of die cavity are decrease, steady and increase,when a cone angle is constant and the friction coefficient is gradually increased from 0 to 0. 1.When the extrusion speed is constant,the temperature rise is increased with the increasing of friction coefficient and extrusion cone angle.When the friction coefficient is fixed, the temperature rise is increased with the rise of extrusion speed and cone angle.
出处
《润滑与密封》
CAS
CSCD
北大核心
2015年第5期37-41,共5页
Lubrication Engineering
基金
国家自然科学基金项目(51257216)
关键词
模具型腔
温升
挤压
热力耦合
die cavity
temperature rise
extrusion
thermal-mechanical coupling
