Problems Arising from Plastic Mold Parts Polishing

    In the process of manufacturing, plastic mold parts polishing is a very

important working procedure. It is related to the quality and service life

of plastic mold parts. However,  there are often a lot of problems to

appear. Today, I will talk about the problems arising from plastic mold

parts polishing.
    1. Excessive polishing
    In the daily polishing process, one of the biggest problems is

"excessive polishing". The longer the polishing time is, the worse the

quality of mold surface will be. There are two kinds of phenomena of

excessive polishing: "pitting" and "Orange peel". Excessive polishing often

take place in mechanical polishing.
    2.The causes of the formation of "pitting" on the workpiece surface
    Due to some non-metallic impurities in the steel, usually hard and

brittle oxide, they are pulled out from the steel surface in the polishing

process, and then form a crater or pitting. The major factors in the

production of the "pitting" have the following points:
    1)The polishing pressure is too much, and the polishing time is too

long.

    2)Steel purity is not enough, and Hard impurity content is high.
    3)The surface of plastic mold parts rust.
    4)Black leather material is not clear away.
    3. The measures to eliminate the “pitting”
    1) Carefully grind the surface again.
    2) When the size of sand grain is less than 1 mm, it should avoid using

the most soft polishing tools.
    3) Adopt the shortest polishing time and the smallest polishing strength

as far as possible.
    Above are the problems arising from plastic mold parts polishing, and

the measures solving these problems. Plastic mold parts manufacturers must

master the working principle and technological process of mold parts 

polishing. Choosing the reasonable polishing methods can improve the quality

and prolong the service life of mold parts.

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