| 摘要 |
The invention relates to a punch for shaping ceramic pieces with dovetail grooves, comprising a series of metal mortises on which a less dense plastic material such as polyurethane, rubber, etc, can be disposed in any size or shape and which can be placed anywhere on the punch either on the surface or embedded therein or projecting a few millimetres therefrom. The punch is totally covered by the same type of material but with a greater density. The plastic material for vulcanisation is applied by means of a template, whereby mortises are produced when the punch is applied to the ceramic pieces, said mortises having a first top section that is slightly curved with the purpose of enabling stripping, wherein said first section penetrates into the ceramic piece and then widens in the lower part in a dovetail manner. In order to prevent dovetailing in one of the edges, the opposite edges of the mortises of the template are slightly inclined so as to obtain an inclined vulcanisation on the edges of the punch.
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