Abstract: The cavity pressure curve could be calculated quantitively by its integral value. The linear relationship between the integral value of cavity pressure curve and the various process parameters could be explored by adjusting the injection speed, the position of rotary pressure point, and the holding pressure and time. According to this linear relationship, the optimal process parameters were obtained, and the traditional empirical parameters were transformed into precise numerical parameters.

Key words: avity pressure, linear relation, process parameter, adjustment of parameter