1 the first is the control of material temperature and mold temperature. Generally, it is easy to control plastic materials within the optimal flow value range, but the control of mold temperature is more complicated. Injection molded parts with different shapes, sizes and wall thickness ratios have certain requirements for cooling. The mold temperature largely controls the cooling time, so try to keep the mold at an allowable low temperature.

2. Secondly, the adjustment and control of pressure and exhaust. If there is a special need to open an exhaust slot on the ejector pin, the reason is the same. First, there is no waste edge, and second, it takes effect quickly.

3. Finally, the auxiliary molding control of injection molding parts size. Some plastic parts have different shapes and sizes. After demoulding, with the change of temperature and the loss of pressure, there will be different deformation and warping. At this time, some auxiliary fixtures can be used for adjustment, and remedial measures can be taken in time after the molded parts are out of the mold. After natural cooling and setting, better correction and adjustment effects can be achieved. If strict management is ensured in the whole injection molding process, the size of injection molded parts will be controlled very well.