A supporting woman down-behaving expire is fitted on top of the male pass away and goes downwardly into shut distance with all the masculine expire with page aluminum covered with a tensioned condition therebetween. The metallic sheet is formed in a predetermined design whereupon the female expire is shifted upwardly out of distance with all the male expire, the stress released as well as the sheet taken away.

The male die is positioned on a vertically movable die table which is moved upwardly as the arms are moved downwardly, according to the embodiment of the invention disclosed in this application. As a result, the degree of your form used on the aluminum page results from the sum of the downwards movement from the hands which in turn causes the steel page to be twisted to the men expire, along with the upwards motion of the vertically movable pass away kitchen table which the male perish is placed. Accordingly, the steel page remains to be in a comparatively convenient location where by it can be reached and manipulated by the stretch machine user.

If at all possible, the forearms are pivoted around the carriage at a point under the level of the die desk surface area on which the men expire is fitted, once the perish kitchen table reaches its lowermost placement.

According to one embodiment of the invention disclosed in this application, side clamping means are provided for applying inwardly directed forming pressure to the metal sheet at substantially right angles to the direction of the tension applied by the tensioning means.

The female down-acting die is mounted for reciprocating movement on a bulldozer platen, which platen includes a plurality of clamping cylinders mounted on the apparatus carriage in spaced-apart relation around its periphery, according to another embodiment of the invention disclosed in this application. The cylinders are operatively connected with the bulldozer platen around the periphery of the platen in order to define sufficient space between the cylinders so that the metal sheet can be manually inserted therebetween into the jaws, and removed after stretch forming of the metal sheet has taken place.