Knockeout core cymbal shaped grinding apparatus and production method thereof

The present invention relates to a sharper and provides a loose core cymbal-shaped sharper and a manufacturing method thereof. The loose core cymbal-shaped sharper is designed for overcoming the disadvantage of the existing similar product of imperfect integral structure design which causes the waste of resource, and the cymbal-shaped sharper is divided into a combination structure of a grinding plate and a grinding core. In the technique key points, the inner diameter of the grinding plate is provided with a dentiform concave face; the outer diameter of a lower grinding core is provided with a dentiform convex face; the dentiform concave face and the dentiform convex face are meshed with each other; the grinding core drives forwardly, and the grinding plate drives passively, so as to achieve the integral linkage and realize the function of the existing cymbal-shaped sharper completely. The grinding core consists of an upper grinding core, the lower grinding core and a movable scaleboard, wherein, the through