In order to study the static stiffness of high speed motorized spindle, using DH3818 static strain gauge, the relation-ship between motorized spindle static stiffness and the force on the motorized spindle was studied. Using static strain gauge and force sensor, the radial rigidity and axial rigidity of 1. 5×104 r/min motorized spindle and 6×104 r/min motorized spindle were tested when the spindles were in stable state. The high speed motorized spindle static stiffness was inversely proportional to the end deformation. The comparative analysis to the 1. 5 ×104 r/min motorized spindle axial stiffness and radial stiffness shows the motorized spindle radial stiffness is far greater than the axial stiffness. The comparative analysis to the 1. 5 ×104 r/min and 6×104 r/min motorized spindle ra-dial stiffness shows the motorized spindle with lower maximum speed has big stiffness than that with high maximum speed. Because low stiffness has impact on CNC machine tool performance, so improving the static stiffness of the motorized spindle can also improve the performance of the machine.%为研究高速电主轴静刚度的特性,利用DH3818静态应变测试仪,以高速电主轴为本体,研究高速电主轴静刚度与作用在电主轴上的力之间的关系.使用静态应变测试仪和力传感器在电主轴处于稳定状态时对1.5×104 r/min电主轴和6×104 r/min电主轴的径向刚度和轴向刚度进行测试,通过测试得知:高速电主轴静刚度大小与端部变形量成反比.对比分析1.5×104 r/min电主轴轴向刚度与径向刚度,可知电主轴径向刚度远远大于轴向刚度;对比分析1.5×104 r/min与6×104 r/min电主轴径向刚度,可知最高转速低的电主轴比最高转速高的电主轴刚度大.又因为过低的静刚度会对数控机床的性能造成影响,所以提高电主轴静刚度也可使机床的性能得到提高.
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