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Solve the factors causing dimensional instability of plastic parts:

1) The electrical and hydraulic systems of the injection machine are unstable;

2) Unstable feeding amount;

3) Uneven plastic particles and unstable shrinkage;

4) The injection molding conditions (temperature, pressure and time) change, and the molding cycle is inconsistent;

5) The gate of injection mold is too small, the size of multi cavity feed port is inconsistent, and the feed is unbalanced;

6) The precision of injection mold is poor, the action of moving parts is unstable and the positioning is inaccurate.