Modified plastic injection molds are mostly made of tool steel. During work, it encounters corrosive gases, water and other substances that cause rust. Plastic parts made from rusty molds will cause quality problems, so they need to be eliminated. In the following, we will analyze the reasons for the rust of the modified plastic injection mold and its elimination methods from three aspects: the gas generated by the decomposition of the melt, the cooling water in the mold, and the carbides generated during molding.
1. Gas produced by melt decomposition: some raw materials will produce volatile gas after heating, many raw materials also produce volatile gas when overheated, these gases are mostly corrosive, they are diffused around the machine, when the mold is not working, they It will corrode the mold. In this regard, when the machine stops working, use a soft cloth 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 when the mold is closed, butter should be applied to block the pouring. mouth.
2. Cooling water in the mold: Cooling water is often used in the mold for cooling, so there is more moisture around the machine. If the mold is cooled below the dew point, the moisture in the air will form water droplets on the surface of the mold. If it is not wiped off in time, it will be easy to rust. Especially after the mold stops working, condensed water will be generated quickly. Therefore, do not stop molding easily. Even if you want to stop, turn off the cooling water and wipe the mold dry.
3. Carbides produced during molding: After the mold has been working for a long time, carbides are precipitated and decomposed in the molding material, which often causes the mold to wear, corrode or rust. In this regard, if carbide formation is found, it should be wiped off and cleaned with a dry cloth immediately.