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宝钢2050轧机用大型直流电动机,电枢必须不带轴进行真空压力整体浸漆(因受浸漆罐高度所限),即采用浸漆后再套轴的新工艺。由于套轴时电枢已下完线,加热温度受到限制,不得高于130℃。为了套轴时有足够的配合间隙,轴还要用干冰冷却到-30℃左右。这样装配的轴和壳(当紧量从0增至最大值的过程中、壳体的轴向收缩和轴的轴向伸长将受到壳体与轴间摩擦力的阻挡;从而使壳体内产生轴向拉应力,在轴内产生轴向压应力)便产生了轴向应力,同时壳体端面与轴肩之间形成间隙。为了消除其轴向应力和间隙,结合YR143/39-10 800kW中型交流电动机生产,采用了油压扩大法:在轴和壳配合面间注入高压,使壳体弹性扩大,轴
Baosteel 2050 mill with a large DC motor, the armature must be vacuum-impregnated with a shaft as a whole (due to the height of the dipping paint cans), that is, the use of dipping after the sleeve of the new technology. As the sleeve armature has been completed under the line, the heating temperature is limited, not higher than 130 ℃. In order to set the shaft with enough clearance, the shaft is also cooled with dry ice to about -30 ℃. The shaft and shell thus assembled (axial shrinkage of the shell and axial elongation of the shaft will be impeded by the friction between the shell and the shaft as the tightness increases from 0 to the maximum; thereby creating a Axial tensile stress in the shaft to produce axial compressive stress) will have an axial stress, while forming a gap between the housing end face and the shoulder. In order to eliminate its axial stress and clearance, combined with YR143 / 39-10 800kW medium-sized AC motor production, the use of hydraulic expansion method: injection of high pressure between the shaft and the shell with the mating surface to expand the elastic shell, the shaft