| 摘要 |
PURPOSE:To make it difficult to develop burrs or obtain a formed body to which no damage is given even when burrs develop, by a structure wherein projected parts are continuously or intermittently provided on the peripheral edge parts of the surfaces, which come into contact with raw material, or a top force and/or of a bottom force. CONSTITUTION:Projecting parts 5 are provided on the peripheral edge parts of the surfaces, which come into contact with ceramics stock 4, of a top force 2 and of a bottom force 3 at the upper and lower parts of a frame 1. Said projecting part 5 may well be continuous or intermittent and about 0.2-3mm in height and about 0.2-3mm in width. The shape of the projecting part 5 is hemispherical, of unilateral slope or of bilateral slope. The projecting part 5 having a unilateral slope as shown in the middle of three figures is the most preferable one. Due to the above-mentioned projecting parts, stock is prevented from entering the gaps between the frame 1 and the upper force 2 or the lower force 3, resulting in making the development of burrs difficult. Further, even when burrs develop, the removal of the burrs is unnecessary or easy. Consequent ly, the damage of a formed body due to burrs is eliminated.
|
