| 摘要 |
PROBLEM TO BE SOLVED: To detect the short of a fine part. SOLUTION: A pressure-time chart in injection molding work is a curve wherein a first region R1 small in the difference between the case of good products P, P1, P2 and P3 and the case of defective products and rising slowly, a second region R2 where the case of the good products previously rises as compared with the case of the defective products to steeply rise and a third region R3 small in the difference between the case of the good products and the case of the defective products and slowly rising toward a peak are continuously constituted. Two monitor sections W1 and W2 are set and products passing through these sections are judged to be good products and, in other case, the products are judged to be the defective products. When the generation of short defectiveness is judged in molding work, molded articles judged to be defective are sorted and the molding conditions of the molding work by the injection molding machine are changed to prevent the generation of short defectiveness.
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