The treatment method for stomata

① Use clean furnace materials and control the appropriate melting temperature, while conducting exhaust treatment;
② Select reasonable process parameters, injection speed and high-speed switching points;
③ Ensure the pressure balance of the molten metal, orderly filling the cavity to facilitate gas discharge;
④ Ensure that the exhaust grooves and overflow grooves have sufficient exhaust capacity;
⑤ Select coatings with low gas generation and control the exhaust volume properly.