千吨级注塑机十字头轴孔配合的接触分析

针对曲肘式注塑机短连杆与十字头轴孔配合接触部分容易发生疲劳失效状况,以短连杆与十字头轴孔配合接触对为研究对象,应用有限元法通过等效简化建立有限元接触模型。充分考虑轴孔配合表面接触微粒间的相互作用影响,运用大型有限元软件ANSYS中的非线性有限元仿真方法,数值计算并分析了不同作用力、不同摩擦系数下接触面的接触状态。结果表明,轴孔配合在轴受作用力变形后,接触面出现应力集中,接触应力与摩擦应力由轴外侧往内侧逐渐递增,为分析轴孔配合接触失效提供了一定的依据。

Contact Analysis of Cross Head Shaft and Hole of Thousand-Ton Plastic Injection Molding Machine

For the sake of easily occurred failure of the contact circumstance, a short rod in contact with the shaft hole on the crosshead of the toggle injection molding machine was used as the research object, the finite element method as well as the equivalent simplified method were applied to form the contact model. Fully considering the impact of the shaft bore surface contact with the interaction between the particles, the software ANSYS in nonlinear finite element simulation method was applied to calculate the contact state of different forces and friction coefficients. The result showed that after the shaft deformed with the force, the stress concentration of the contact area occurred, as well as the gradually rising of the contact stress and the frictional stress, also provided a certain basis for the failure of the contact analysis.