(1) The number of mold cooling water holes should be as large as possible, and the hole diameter should be as large as possible. The distance between the cooling water hole caution wire and the cavity wall is usually 12-15 mm, the center distance between the cooling water channels is about 3-5 times the diameter of the water hole, and the water channel diameter is generally 8 mm or more. Here is a brief introduction to the temperature principle during mold processing. How to control the temperature?
(1) The number of mold cooling water holes should be as large as possible, and the hole diameter should be as large as possible. The distance between the cooling water hole caution wire and the cavity wall is usually 12-15 mm, the center distance between the cooling water channels is about 3-5 times the diameter of the water hole, and the water channel diameter is generally 8 mm or more. Here is a brief introduction to the temperature principle during mold processing. How to control the temperature?
(2) The distance from the water hole to the surface of the cavity should be as equal as possible. When the wall thickness of the plastic part is not uniform, the cooling should be strengthened at the welding wall.
(3) The mold gate should be cooled,
(4) If the mold cooling water passes through the insert or its joint part, it should be sealed to prevent water leakage.
(5) The mold cooling water hole should avoid the welding mark of the plastic parts.
(6) The mold cooling water withdrawal diameter can be determined according to the average wall thickness of the product. When the average wall thickness is 2 mm, the diameter of the water hole is 8-10 mm; when the lower wall thickness is 2-4 mm, the diameter of the water hole is 10-12 m; when the average wall thickness is 4-6 mm, the diameter of the water hole is taken as l0. - 14mm to determine the diameter of the cooling water hole should pay attention to the problem is that no matter how large the mold, the diameter of the water hole is generally not more than 14mm, otherwise it is difficult to form turbulent flow.
(7) The position of the inlet and outlet water pipe joints should be placed on the same side of the mold as much as possible.
control method:
In the hot runner mold, the temperature of the runner plate is required to be high, and a heating cup must be provided. In order to avoid the heat transfer of the flow channel plate to the fixed model cavity, it is difficult to cool the mold cavity, and the contact area between the heat flow plate and the fixed mold should be minimized. Generally, the mold temperature is controlled by adjusting the temperature of the heat transfer medium and adding a heat insulating plate and a heating body. The heat transfer medium generally uses water, oil, etc., and the pass is generally referred to as a cooling water passage.
Generally, hot water and hot oil (heating machine heating) are introduced into the cooling water channel to raise the mold temperature. When the mold temperature requirement is high, in order to reduce the loss of heat, the heat insulation board should be added to the mold panel.
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