| 摘要 |
<p>A method of discriminating non-defectives from defectives in an injection molding machine capable of properly and quickly setting discriminating reference parameters and accurately discriminating non-defectives from defectives. In each of a plurality of injection steps during molding of non-defectives, a group of injection pressure curves as a function of screw position and a group of injection pressure curve as a function elapsed time after the start of the injection are displayed in two coordinate systems on display screens on the basis of injection pressures and screw positions, both of which are sampled periodically. For respective screw positions and elapsed times selected in the coordinate systems, various reference values (x, p, t) and various upper and lower limit values (pu, pl, tu, tl, xu, xl) for determining various tolerance ranges are set in data display columns (8, 9) in consideration of distributed states of the groups of pressure curves and displayed details displayed in a data display column (10) and variable in accordance with the movement of cursors (11, 12). During the execution of the real molding cycles, real elapsed times and real injection pressures at respective selected screw positions, or real screw positions and real injection pressures at selected elapsed times are compared with the tolerance ranges to determine their suitability, thereby discriminating non-defectives from defectives on the basis of the number of discriminated defectives. <IMAGE></p> |
