| 摘要 |
<p>In a pressure setting method which is used for an injection molding machine equipped with a mold, an injection unit and a control unit and which sets and controls a series of pressures required at the start of injection of a resin to the mold and a dwelling step through a filling step, the method of the present invention sets sequentially the series of pressures described above in accordance with a time-injection pressure characteristic curve that is determined under the condition that the volume of the resin inside the mold at the dwelling step is substantially constant, and changes locally the dwelling stop of the characteristic curve in accordance with a mold to be obtained. The characteristic curve provides an exponential curve at the dwelling step and the local change described above is carried out pulse-wise so that the characteristic curve becomes discontinuous. In this manner, the pressure values can be set in accordance with the shape and thickness of the resulting mold. To obtain such pressure values, the control unit includes a function generator to which parameters at each step are applied, and a signal generator for applying the pulse is connected to this function generator.</p> |
