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The softness of enamelled wire is an important indicator in use. Winding in the framework of the coil, such as the enamelled wire due to poor softness and rebound deformation, the coil diameter becomes larger, not accommodate within the framework; around the rectangular coil, due to the rebound will bounce out of the slot. Softness directly affects the processing quality and labor productivity of the coil windings.

Affect the corner of the springback factor: degree of annealing. In the fully annealed wire, there is little or no residual internal stress. When doing the rebound test, the material only relies on the strain potential energy caused by the test itself to rebound, so the rebound angle is small. During the drawing process, the intermediate annealing process is 5 to 6 smaller than the direct drawing process. The faster the vehicle speed, the larger the rebound angle. Fast speed, annealing time is short, the rebound angle increases.

The thicker the film, the larger the rebound angle. The paint film itself has elasticity. When it is wound on the rebound angle tester, the wire itself is subjected to tensile stress and bending stress. When the external force is removed, the elastic deformation of the paint film itself needs to rebound except for the copper wire itself. The higher the oven temperature, the smaller the rebound angle. Copper wire in the process of entering the enamel furnace, the equivalent to continue to be a softening.

The rebound angle has a lot to do with the production process, but various influencing factors are mutually restricted and need to fully consider the overall performance. Factors that affect the results of the rebound angle test: winding speed, free rebound, rod diameter, wire diameter, load, tension, pointer length.

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