In the field of plastic mold processing, polishing is one of the crucial processes, and precisely controlling the degree of polishing is the core factor in ensuring the quality and performance of the molds. Insufficient polishing will fail to achieve the desired ideal results; while excessive polishing can also lead to a series of adverse consequences for the plastic molds.

The main purpose of polishing is to achieve mirror - finishing on the mold surface and effectively solve problems such as tiny pores on the mold surface. However, excessive polishing, which means the polishing time exceeds a reasonable range, will cause the surface quality of the mold to deteriorate sharply.

When excessive polishing occurs in the mold, orange - peel and micro - pits are two common defects. Orange - peel refers to an irregular and rough surface, which usually appears during the mechanical polishing process of the mold. This defect is mainly caused by excessive polishing pressure, overly long polishing time, or improper polishing methods.

In actual production, due to a lack of in - depth mastery of polishing techniques, when some plastic mold factories find that the surface quality of the mold is poor during the polishing process, they often increase the polishing pressure and extend the polishing time. This blind operation, coupled with the lack of polishing skills, ultimately results in extremely poor surface quality of the mold.

The formation of micro - pits on the mold surface is closely related to the purity of the steel. During the polishing process, hard and brittle oxides are easily pushed out from the surface of the steel, thus forming micro - pits.

Therefore, the adverse consequences after polishing plastic molds are related to various factors such as polishing pressure, polishing time, steel purity, polishing tools, and abrasive materials. Only by comprehensively considering these factors and precisely controlling the polishing process can adverse consequences be effectively avoided and high - quality mold production be ensured.

FAQ

Q1: How can I tell if a plastic mold has been over - polished?
A: You can observe the mold surface. If orange - peel (an irregular and rough surface) or micro - pits are present and the surface quality has deteriorated, it is likely that the mold has been over - polished. You can also use professional testing instruments to check whether parameters such as surface roughness exceed the standard range.

Q2: Besides adjusting the polishing pressure and time, are there any other solutions for the orange - peel defect caused by over - polishing?
A: You can replace the appropriate polishing tools and abrasive materials and adopt a more refined polishing process. If the orange - peel is severe, it may be necessary to re - process the mold surface, such as lightly grinding it and then performing correct polishing.

Q3: Regarding the micro - pit problem caused by impure steel, besides selecting high - purity steel, what measures can be taken during the polishing process?
A: Pre - treat the steel before polishing, such as through pickling or sandblasting, to remove surface impurities and oxides. When polishing, choose a suitable polishing fluid to enhance the ability to remove oxides and reduce the formation of micro - pits.