Plastic Injection mold polishing process

(1) rough polishing

The surface after finishing, EDM, grinding, etc. can be polished by a rotary surface polishing machine with a rotational speed of 35,000 to 40,000 r/min. Then there is a manual oil stone grinding, strip of oil stone plus kerosene as a lubricant or coolant. The order of use is 180#→240#→320#→400#→600#→800#→1000#.

(2) Semi-fine polishing

Semi-finishing mainly uses sandpaper and kerosene. The number of sandpaper is: 400#→600#→800#→1000#→1200#→1500#. In fact, #1500 sandpaper only uses die steel suitable for hardening (above 52HRC), and is not suitable for pre-hardened steel, because it may cause damage to the surface of pre-hardened steel and cannot achieve the desired polishing effect.