The grinding method can make the mold surface finish, bright and clean degree related to the following factors:

The 2 tool steel quality

The 2 heat treatment process

A 2 polishing technology

Often think of polishing technology is the most important factor. Appropriate polishing technology with high qualitytool steel and proper heat treatment process can obtain satisfactory finish. On the contrary, polishing technologyproperly, even with the most high-quality steel will not reach the height of the mirror effect.

Quality tool steel

The uneven surface hardness of steel or have different characteristics often have difficulties polishing. Various inclusions and porosity in steel are not conducive to the polishing. In order to improve the polishing performance,ASSAB in the mould steel used in the production of vacuum degassing and electroslag remelting (ESR) technology.

The vacuum degassing technique can reduce the formation of dangerous inclusions and gas brittle, but also obtain uniform steel.

The electroslag remelting (ESR) technology can significantly improve the polishing performance, better effect thanusing vacuum gas technology. The electroslag remelting (ESR) process can reduce the content of impurities, so thatcan not be eliminated and the remaining trace impurities are evenly distributed in the steel matrix.

The electroslag remelting method (ESR) refining ATAVAX ESR and stainless steel OPTIMAX is especially suitable formold surface finish requirements, such as optical lens mold.

Heat treatment process

Heat treatment in many aspects will affect the polishing performance. To increase the surface hardened steel due to surface carbon composition, the microstructure is not conducive to the polishing. Because of the small oxide particles increased difficulty of steel surface polishing. The steel surface carburization or decarburization will make the hardness change, resulting in the difficulty of polishing.

Polishing technology

Effects of different grades of the polishing process

General ASSAB die steel, in the use of the same hardness, polishing process using standard, basically the samepolishing time required. But STAVAX ESR (S-136) and OPTIMAX stainless steel mold exception, because of theirhigh surface finish degree, grinding technique is slightly different: to minimize the sand surface grinding to finepolishing before. The most important is to eliminate the polishing a polishing operation.

Effects of different hardness on the polishing process

Hardness increased to increase the grinding of difficult, but polished finish. The increase in hardness, to achieve the required finish polishing time higher relative growth. At the same time, hardness higher, the possibility of excessiveand a corresponding reduction in polishing.