1. Moderate cooling of die surface

控制脱模剂附着时模具温度在180-250摄氏度，模具凹凸面温度不均匀，冷却销、钉等突出部位，是模具内部控制的补充。

The mold temperature is controlled at 180-250 ℃ when the release agent is attached, the temperature of the concave and convex surfaces of the mold is uneven, and the protruding parts such as the cooling pin and nail are the supplement of the internal control of the mold.

2、润滑模具

2. Lubricating mould

由于冷缩效应，铸件和模具发生相反方向的热变形，需要润滑协助脱模。芯型滑块尺寸越大，对润滑的要求越高。

Due to the cold shrinkage effect, the casting and the mold have the opposite direction of thermal deformation, so lubrication is needed to assist demoulding. The larger the size of core slider is, the higher the requirement of lubrication is.

3、隔离模具和压铸件

3. Isolate the mold from the die casting

防止高温高压下金属粘连。在水口等流速越高的位置，隔离膜越难形成。

Prevent metal adhesion under high temperature and high pressure. The higher the flow velocity is, the more difficult the isolation film is to form.

4、去除残留杂质

4. Removal of residual impurities

防止水分和杂质引起气泡、砂眼、黑斑等表面缺陷。

Prevent surface defects such as bubbles, sand holes and black spots caused by moisture and impurities.

喷涂对模具表面温度的控制

Control of mold surface temperature by spraying

1、水的汽化对涂层附着的影响

1. Effect of water vaporization on coating adhesion

研究表明，压铸过程中，水汽化带走的热量大大高于直接冲刷模具表面带走的热量，因此水的汽化是喷涂过程中主要，的冷却方式。只有当模温高于一定值，脱模剂中的水才能汽化，有效物质才能附着在模具表面，形成涂层，水分才不会残留在模具内，当形成气泡水蒸气的向上运动又使正面方向射来的液滴反弹，阻碍液滴附着。

The results show that the heat taken away by water vaporization is much higher than that taken away by directly scouring the die surface in the die casting process, so water vaporization is the most important and efficient cooling method in the spraying process. Only when the mold temperature is higher than a certain value, the water in the mold release agent can vaporize, the effective substance can adhere to the mold surface, form a coating, and the water will not remain in the mold. When the bubble is formed, the upward movement of the water vapor will make the droplets from the positive direction rebound and hinder the droplet attachment.

2、涂层形成的表面温度

2. Optimum surface temperature for coating formation

涂层形成的表面温度是180-250℃，水的汽化量适中，形成平整涂层。如果模具表面温度过高，造成水爆炸式汽化，蒸汽阻碍脱模剂到达模具表面，不但影响涂层形成而且浪费脱模剂导致喷涂时间加长也容易使模具出现裂纹。如果模具表面过度冷却，脱模剂中水分蒸发不足，附着不佳，涂层易被冲走，影响涂层形成且模具中残留水分杂质不易形成高质量压铸件。

The optimum surface temperature of the coating is 180-250 ℃, and the evaporation amount of water is moderate to form a smooth coating. If the mold surface temperature is too high, the water will vaporize explosively, and the steam will prevent the release agent from reaching the mold surface, which will not only affect the formation of coating, but also waste the release agent, lead to longer spraying time, and also make the mold crack easily. If the mold surface is over cooled, the moisture in the mold release agent is not enough to evaporate, and the adhesion is poor, the coating is easy to be washed away, which affects the formation of the coating, and the residual moisture impurities in the mold are not easy to form high-quality die castings.

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