针对机床结构中的平面结合面,通过实验分析了结合面在均布面压作用下的结合面法向变形与平均压力的关系;将结合面表面简化为半圆弧和正弦曲线两种微观形貌,利用有限元方法模拟结合面的接触变形力学行为,计算结果显示半圆弧形貌接触分析结果与实验结果较为接近.从结合面作用的物理本质出发,将结合面的相互作用等效为内聚力效应,利用内聚力模型分析了结合面的静态力学行为;内聚力模型计算结果与实验结果吻合较好. The relationship between the normal deformation of the joint surface and the average pressure of the joint surface under the uniform surface pressure is analyzed experimentally for the plane joint surface in the machine tool structure. The surface of the joint surface is simplified into two micro-shapes of semicircular arcs and sinusoidal curves The results show that the contact analysis results of semicircular arcs are close to the experimental ones.From the physical nature of the bonding surface, the interaction of the bonding surfaces is equivalent to Cohesion effect, the use of cohesion model analysis of the static mechanical behavior of the joint surface; cohesion model calculated results agree well with the experimental results.