| 摘要 |
PROBLEM TO BE SOLVED: To solve such problems that the conventional injection speed control method for a die casting machine is the one for controlling the injection speed of an injection plunger while renewing the value of an opening degree command outputted to a flow rate control valve at a constant period, and even in the case where the renewed period is the extremely short, since the higher the injection speed is, the larger the shifting rate of the injection plunger at the time interval renewing the value of the opening degree command is, the dispersion of the changing position of the injection speed at the high speed injection is not avoided. SOLUTION: The injection speed of the injection plunger is controlled while renewing the opening degree command signal to the flow rate control valve without delayed time by synchronizing with a pulse outputted from an injection stroke sensor at each constant shifting rate of the injection plunger. In such a way, even in the case of high injection speed, the changing position of the injection speed is not dispersed and the stability of the quality of the die casting product is drastically improved.
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