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模具生锈是由哪些原因造成的

What are the causes of mold rust?

模具生锈是正常现象，是有特殊原因造成的，并不是钢材质量问题。今天小编就给大家讲下模具生锈是由哪些原因造成的。

Mold rust is a normal phenomenon, there are special reasons, not steel quality problems. Today Xiaobian will tell you what causes the mold rust.

(1)熔体分解产生的气体

(1) gases produced by melt decomposition.

有些原料加热后会产生挥发性气体,这些气体多带腐蚀性,它们会对模具产生腐蚀。因此,设备停止工作时,应用软布将模具擦净,并闭合模具,若较长时间不用时,模腔内要喷防锈剂,在关闭模具时还要涂上黄油,堵上浇口。

Some raw materials are heated to produce volatile gases, which are more corrosive and corrosive to the mold. Therefore, when the equipment stops working, the mold is wiped clean by soft cloth, and the mold is closed. If it is not used for a long time, the mold cavity should be sprayed with antirust agent, butter should be applied when the mold is closed and the gate should be plugged.

(2)模具中的冷却水

(2) cooling water in mold

模具中多采用冷却水以进行冷却,因此成型设备周围水气较多。如将模具冷却到露点以下,空气中的潮气就会在模具表面结成水珠,如不及时擦去就易生锈。特别是在模具停止工作后,会很快产生冷凝水。因此,停止成型时,也要关闭冷却水,并将模具擦干。

More cooling water is used for cooling in the mould, so there is more water vapor around the molding equipment. If the mold is cooled below the dew point, moisture in the air will form water droplets on the surface of the mold. If not erased in time, it is easy to rust. Especially when the mold stops working, condensate will soon be produced. Therefore, when the molding is stopped, the cooling water must be turned off and the mold dried.

(3)成型时产生的碳化物

(3) carbides formed during molding

模具在较长时间工作后,成型材料中析出和分解生成碳化物,常使模具磨损、腐蚀或生锈。对此,若发现有碳化物生成,应立即清除干净。

After a long period of working, the mold will precipitate and decompose into carbide in the molding material, which often causes wear, corrosion or rust of the mold. If carbides are found, they should be removed immediately.