Views: 0 Author: Site Editor Publish Time: 2020-08-06 Origin: Site
The wedge inserts forming the undercuts are arranged on all four sides of the workpiece and come apart automatically upon opening of the mold as shown in Fig.7.31. The cube-shaped workpiece is provided with a through-hole and an undercut on each of the four side wedge inserts.
Operation: upon opening of the mold, the spring 6 lift the wedge inserts 2 consisting of 4 parts hich are forced apart by the truncated cone shaped part in the centre of the insert 7. The stroke of the inserts is limited by the pins 3. When the mold is fully open, the undercut-forming cams are ithdrawn from the workpieces. Ejector 9 lifts the ejector pins 1 fixed between ejector plates 14 and 13, these lift out the workpieces. Before the mold is closed completely, the wedge inserts are pressed into position by the pins 28, operated by the spring 27.
Advantage: the mold is fully automatic.
Disadvantage: the inserts which consist of 4 parts require very careful fitting.
