First of all, let's take a look at what is the orange peel phenomenon. The common problem encountered in the daily polishing process of the
mold is excessive polishing. It means that the longer the polishing time, the worse the quality of the mold surface, and there are two phenomena of excessive polishing. : It is orange peel and pitting.
Then we wondered what is the cause of the orange peel phenomenon? The surface of the mold is overheated or excessively carburized. The excessive polishing pressure and long polishing time are the main reasons for the “orange peelâ€, which is reflected in the polishing of the light guide plate. In the case of pitting, the workpiece is often caused by hard and brittle oxides in the steel. Therefore, the cause of pitting is generally high polishing pressure, long time, low purity of the steel, and rust on the surface of the mold. So how to solve this problem?
a. Carefully re-grind the surface, the grit size is slightly larger than the previously used particle size, and the final step of grinding and polishing is performed using soft and sharp oilstone.
b. Avoid the softest polishing tools when the sand size is less than 1mm.
c. Use the shortest polishing time and the minimum polishing force possible.
The excessive polishing time will vary depending on the hardness of the workpiece material. There are two ways to eliminate the orange peel that has already been produced:
a. Remove the defective surface, the grinding particle size is slightly thicker than the previous sand number, and then grind, the polishing particle size is lower.
b. The stress cell is carried out at a temperature lower than the tempering temperature of 25oC, ground using the finest sand number before polishing, and finally polished at the lightest force.
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