In order not to make nickel ring up tank, outside groove diameter ratio inside groove is big, this on the structure solved the nickel ring grooving problem.
为了不使镍环起槽，外沟直径比内沟大，这在结构上解决了镍环起槽问题。
Triangular structure of the outer conductive copper wheel points inside and outside two groove, the copper wire inside groove introduced, complete annealing.
三角结构的外层导电铜轮分内外两沟，铜线经内沟引入，完成退火。
A practical mechanism for the core-pulling of inside groove was presented. The core-pulling was achieved by applying the deformation of helical spring steel sheet during the ejecting process.
介绍了一种实用的内侧槽抽芯机构，可利用螺旋形弹簧钢板的顶出变形实现内侧抽芯，并阐述了抽芯机构的工作过程和关键技术。
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