External pressure mounting process theory
The external press-fitted stator core is laminated by inner circle positioning, and the manufacturing errors of the punched plates are reflected on the outer circle. Therefore, the coordination between the iron core and the base is more difficult to control. When the iron core is pressed into the base, it is easy to produce eccentricity due to loose fitting, or deformation of the base due to over-tightening. In order to eliminate this deformation, ensure the coaxiality of the two ends of the base and the inner circle of the iron core. Generally, the base is positioned on the basis of the inner circle of the iron core, and then the ends of the car are stopped. .
When used on a horizontal lathe, the clamp used is a typical structure for automatic centering. Swelling consists of three cone-shaped blocks, each with a rubber band on each end to prevent the pieces from spreading. The expansion of the tire and the mandrel are tapered. When tightening the nut, push the expansion tire to the left, forcing the expansion tire to increase in diameter, clamping the workpiece, and aligning the axis of the core's inner circle with the axis of the spindle. Therefore, the stop of the finishing car is coaxial with the inner circle of the iron core. When a special n-shaped cutter bar is used, when a knife is installed at both ends, the finishing of both ends of the nozzle can be completed successively in the case that the workpiece is clamped once, that is, one end of the car is finished with a knife. Then, use another knife to finish the other end of the car. When finishing the stator stop, the scrap iron should be prevented from entering the end of the winding so as not to damage the winding. Therefore, use a protective cover and protect the end of the winding at the finisher stop.
If a fine lathe is used for a vertical lathe, then after the end of one end of the car, the mandrel shall be installed with the stator turned around, and then the other end shall be stopped. In this way, not only the efficiency is low, but also the two ends of the nozzle may be different axes due to two clampings.