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一、理论分析为了研究方便,我们将带有键槽的轴置于三维直角坐标系中;使轴中心线与Y轴重合,使键槽在垂直于轴中心线的横截面(以后简称横截面)中的对称中心线与X轴平行。由国家标准《形状和位置公差术语和定义》GB118—80可知,轴键槽对称度的实际误差应是某两平行平面之间的距离,该两平面对称地配置在通过基准轴线的辅助平面两侧,且键槽在深度h的范围内其对称中心面刚好位于该两平面之间,且使得该平面之间的距离为最小。今就此分两种情况来讨论。首先看横截面中的情况(见图1)。由上所述,
First, the theoretical analysis In order to facilitate the study, we will be placed with a keyway axis Cartesian coordinate system; so that the axis coincides with the Y-axis, so that the keyway perpendicular to the axis of the cross-section of the center line (hereinafter referred to as the cross-section) The center of symmetry is parallel to the X axis. From the national standard “shape and position tolerance terms and definitions” GB118-80 shows that the actual error of the keyway symmetry should be the distance between two parallel planes that are symmetrically arranged on both sides of the auxiliary plane through the reference axis , And the keyway has its center of symmetry located exactly between the two planes within the depth h and minimizing the distance between the planes. Now this is divided into two situations to discuss. First look at the cross-section of the situation (see Figure 1). From the above,