Analysis of the causes of rusting of modified plastic injection molds and its elimination method

Most of the modified plastic injection molds are made of tool steel, and they are exposed to corrosive gases, water, and other substances that cause rusting in their work. The plastic parts made by rusty molds will have quality problems, so we need to eliminate them. The following is the analysis of the causes of rusting of modified plastic injection molds and its elimination methods from three aspects: gas generated by melt decomposition, cooling water in the mold, and carbide generated during molding.

1. Gas generated by the decomposition of the melt: some raw materials will produce volatile gas after heating, many raw materials also produce volatile gas when overheating, these gases are mostly corrosive, they are diffused around the machine when the mold does not work, they will produce corrosion on the mold. In this regard, when the machine stops working, a soft cloth should be used to wipe the mold and close the mold, if it is not used for a long time, the mold cavity should be sprayed with rust inhibitor, and butter should be applied when the mold is closed and the gate should be blocked.

2. Cooling water in the mold: The cooling water in the mold is used for cooling, so there is more water vapor around the machine. If the mold is cooled to below the dew point, the moisture in the air will form water droplets on the surface of the mold, which is easy to rust if not wiped away in time. Especially after the mold stops working, it will produce condensation soon. Therefore, do not stop the molding easily, even if you want to stop, you should turn off the cooling water and dry the mold.

3. Carbide generated during molding: After the mold works for a long time, the molding material precipitates and decomposes to generate carbide, which often makes the mold wear, corrosion, or rust. In this regard, if carbide is found, it should be wiped off and wiped clean with a dry cloth immediately.