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精密注射机在控制方面的特点
精密注射机在控制方面的特点
The characteristics of the precision injection machine in control
It
1) 对注塑成型参数的重复精度(再现性)要求高，宜采用多级注射反馈控制：
1) high accuracy (reproducibility) requirement for injection
molding parameters. Multi stage injection feedback control should be
adopted.
a.多级位置控制；
A. multilevel position control;
b.多级速度控制；
B. multistage speed control;
c.多级保压控制；
C. multistage pressure protection control;
d.多级背压控制；
D. multistage back pressure control;
e.多级螺杆转速控制。
E. multistage screw speed control.
The precision of the displacement sensor is required to reach
0.1mm, which can strictly control the metering stroke, the injection
stroke and the thickness of the residual cushion (shooting out the
monitoring point), so as to ensure the accuracy of each injection and
improve the molding precision of the products. The temperature control
of the barrel and nozzle should be precise. When the temperature rises,
the overshoot is small and the temperature fluctuation is small.
Precision injection molding should be controlled by PID, so that the
accuracy of temperature should be between 0.5 and C. Su