大型的数控龙门加工中心中，卧式主轴头通过一对直齿圆锥齿轮副来作为相交轴的传动部件。其加工中心在高速运转时，直齿圆锥齿轮副会发出大的噪声和冲击，导致加工中心的加工质量和精度下降。为了解决这一问题，提出采用弧齿圆锥轮副代替直齿圆锥齿轮副。基于ANSYS Workbench软件，分析直齿圆锥齿轮副与弧齿圆锥齿轮副的齿跟弯曲应力和齿面接触应力的状况，在此基础上，得出弧齿圆锥齿轮副在传动过程中其轮齿的综合力学性能要优越于直齿圆锥齿轮副相应的轮齿性能。这使得数控龙门加工中心可回转式卧式主轴头在更换前70分贝的噪声降至到60分贝，噪声得到了显著的降低。 In the large CNC gantry machining center, through a pair of straight bevel gear pair, the horizontal spindle head is used as a driving part for intersecting axes. When it in high-speed operation, straight tooth bevel gear pair makes a big noise and impact, which results in a decline in the quality and machining precision of the machining center. In order to solve this problem, it is proposed that the spiral bevel gear pair is used instead of the straight bevel gear pair. Based on ANSYS Workbench software, the status of straight tooth bevel gear pair’s and the spiral bevel gear pair’s the bending stress and contact stress are analysed. On this basis, it is concluded that spiral bevel gear pair, in the transmission process, of the comprehensive mechanical properties of the tooth is superior to the gear's performance of the corresponding straight tooth bevel gear pair. This makes CNC gantry machining center which can be rotary horizontal spindle head dropped to before re-placing 70 decibels of noise to the 60 decibels, which is significantly reduced.