Patent ID: 7774092
Filing Date: 2010-08-10
Classification: B22F,B30B,G07C

Abstract:
1. A method for controlling a press during the production of pressed moldings made of powdery or granulate materials, with a pressing tool, an electronic control system, and, following the pressing tool, a test station that is isolated from the vibrations generated by the press, for the automatic measuring of dimensions and sorting of moldings where the material is filled into a die and is compressed by the movement of at least one ram that can be moved relative to the die, comprising: measuring and automatic correction of the ram stroke by means of the electronic control system, following the procedure below: setting a total tolerance range determined by limit values for one or several dimensions of the molding that are to be tested; dividing the total tolerance range for such a dimension into a non-critical tolerance range and a directly adjacent critical tolerance range, both arranged around a nominal value; subdividing the critical tolerance range into a first and an adjacent second action range of different valence, with a higher valence assigned to the second action range than to the first action range; storing the nominal values together with the tolerance ranges and the action ranges for the dimensions to be tested in a storage device of the test station; measuring the dimensions of the molding that are to be tested in an automatic test station immediately after the pressing process of the molding in question; storing of the measured dimensions in each case in the storage device; associating the dimensions measured last in each case, depending on their deviation from the corresponding nominal values, with the non-critical tolerance range or one of the action ranges of the critical tolerance range; and initiating an automatic correction of the ram stroke in dependence on the valence of the action range with which the dimension in question is associated, either immediately or with a delay.