摘要
提出了一种具有水平对称性的多连杆高速精密冲床机构,该机构可以有效地提高冲压时的抗偏载能力并且能够通过调整副滑块的质量对竖直方向的惯性力进行平衡,其结构的对称性保证了运动副的发热左右对称,减少了水平方向的热不平衡对高速精密冲床机构精度的影响。分析了多连杆高速精密冲床机构的运动副类型,并对其接触形式进行了分类。基于发热主要部位(运动副)的接触面相对摩擦速度及负载大小和方向计算出每个运动副在空载和负载状态下的发热功率及发热位置,利用有限元软件对多连杆高速精密冲床整机的温度场和热变形进行了求解,得到冲床主副滑块在下死点位置时的热变形及随时间的变化规律,为该高速精密冲床后续的热平衡设计提供理论依据。
A multi-link high-speed precision punch press mechanism with horizontal symmetry was proposed,which effectively improved the anti-biased load capacity during stamping and balanced the vertical inertia force by adjusting the mass of vice-slider.Simultaneously,the structural symmetry ensured that the heat generated by the kinematic pairs was symmetrically distributed on both sides,thereby reduc-ing the influence of horizontal thermal imbalance on the precision of the mechanism.Then,the types of kinematic pairs in the multi-link high-speed precision punch press mechanism were analyzed,and their contact forms were classified.Furthermore,based on the relative frictional velocity of the contact surfaces for the main heat-generating parts(kinematic pairs)and the magnitude and direction of load,the heat dissipation power and location of each kinematic pair under no-load and load conditions were calculated.Finally,the temperature field and thermal deformation of the whole multi-link high-speed precision punch press were solved by finite element software,and the thermal deformation of the main and vice sliders at the bottom dead center position and its variation laws versus time were obtained,which provided the theoretical basis for the subsequent thermal balance design of the high-speed precision punch press.
作者
彭斌彬
任澳宁
徐伟宁
Peng Binbin;Ren Aoning;Xu Weining(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)
出处
《锻压技术》
北大核心
2025年第7期183-191,共9页
Forging & Stamping Technology
基金
国家自然科学基金资助项目(52175016)。
关键词
冲床机构
发热功率
温度场
热变形
下死点
punch press mechanism
heat dissipation power
temperature field
thermal deformation
bottom dead center
