摘要
研究了不同辊轧参数对叶片辊轧过程中应力、应变、金属流动规律的影响情况。建立了叶片轧制过程的力学模型,分析了叶片在塑性变形区内摩擦系数、轧制速度、压下量对轧制应力、应变的影响;利用Pro/E对叶片模具复杂曲面进行建模,再利用ANSYS/LS-DYNA建立了叶片辊轧系统的动力学模型,将上、下模座作为刚体、叶片作为多段线性弹塑性材料模型处理,分析了叶片在辊轧过程中摩擦系数等辊轧参数对轧制力的影响。研究结果表明:由于表面层摩擦力的限制,叶片表面金属流动速度比中间层低,而产生不均匀变形;叶片曲率变化对叶片轧制应力应变有着直接影响,最大应力、应变主要集中在叶背弧面斜率较大位置处,并且轧件的轧制应力、应变随着摩擦系数的增大而增大,轧制力随着轧制速度和压下量的增加而增加。
The different parameters of effect on stress, strain and the law of metal flow in blade rolling process were studied. Through the establishment of mechanical model of blade rolling process, the effects of friction coefficient, rolling speed and rolling reduction on rolling stress-strain in the plastic deformation zone were analyzed. The complex surface model of blade mold was done through Pro/E software, and rolling system dynamics model of blade was estab- lished by using ANSYA/LS-DYNA software. Upper and lower rollers were treated as rigid body. The blade was trea- ted as a linear elastic model. The effect of rolling ~riction coefficient parameters on rolling force was analyzed. The rek sults show that due to the friction of the surface layer restriction, metal flow speed of blade surface is lower than middle＇s, which results in uneven deformation. The changes of blade curvature have a direct impact on rolling stress strain. Maximum stress and strain are mainly concentrated in the back side slope at the larger location, and stress- strain of blade will be increased as the increase of friction coefficient. The rolling force will be increased as the increase of rolling speed and rolling reduction.
出处
《锻压技术》
CAS
CSCD
北大核心
2013年第1期76-80,共5页
Forging & Stamping Technology
基金
国家科技支持项目:汽车助力转向泵关键技术研究(2007BAF12B01)
关键词
叶片
辊轧
动力学
blade
rolling
dynamics
