The polishing process of Bucket Mould : 1. Fine […]
The polishing process of Bucket Mould :
1. Fine polishing
Fine polishing mainly uses diamond abrasive paste. If a polishing cloth wheel is used to mix diamond grinding powder or grinding paste for grinding, the usual grinding sequence is 9μm (#1800) ~ 6μm (#3000) ~ 3μm (#8000). 9μm diamond paste and polishing cloth wheels can be used to remove hair-like scratches left by #1200 and #1500 sandpapers. Then polish with sticky felt and diamond abrasive paste, in the order of 1 μm (#14000) ~ 1/2 μm (#60000) ~ 1/4 μm (#100000). The polishing process with precision requirements of more than 1 μm (including 1 μm) can be carried out in a clean polishing chamber in the mold workshop. For more precise polishing, an absolutely clean space is required. Dust, fumes, dandruff and drool all have the potential to undo the high-precision polished finish you get after hours of work.
2. Rough throw
After milling, EDM, grinding, and other processes, the surface can be polished by a rotating surface polishing machine or an ultrasonic grinder with a rotating speed of 35 000-40 000 rpm. The commonly used method is to use a wheel with a diameter of Φ3mm and WA # 400 to remove the white EDM layer. Then there is manual whetstone grinding, strip whetstone with kerosene as a lubricant or coolant. The general order of use is #180 ~ #240 ~ #320 ~ #400 ~ #600 ~ #800 ~ #1000. Many moldmakers choose to start with #400 to save time.
3. Semi-fine polishing
Semi-fine polishing mainly uses sandpaper and kerosene. The numbers of sandpaper are: #400 ~ #600 ~ #800 ~ #1000 ~ #1200 ~ #1500. In fact, #1500 sandpaper is only suitable for hardening to die steel (above 52HRC), not for pre-hardened steel, because it may cause the surface of pre-hardened steel to burn.
Fine polishing with abrasive paste, 8000, 10000 will reach the mirror surface.