Polishing Process Of Plastic Molds

The basic program for polishing plastic molds requires high-quality polishing tools and accessories such as oilstones, sandpaper, and diamond grinding paste to achieve high-quality polishing results.
The general process of polishing plastic molds is as follows:
1. Precision polishing
Fine polishing mainly uses diamond grinding paste. If a polishing cloth wheel is used to mix diamond grinding powder or paste for grinding, the usual grinding sequence is 9 μ M (# 1800)~6 μ M (# 3000)~3 μ M (# 8000). nine μ M's diamond grinding paste and polishing cloth wheel can be used to remove hair like grinding marks left by # 1200 and # 1500 sandpaper. Next, polish with adhesive felt and diamond grinding paste in the order of 1 μ M (# 14000)~1/2 μ M (# 60000)~1/4 μ M (# 100000). Accuracy requirement is at 1 μ Above m (including 1 μ m) The polishing process can be carried out in a clean polishing room in the mold processing workshop. If more precise polishing is carried out, an absolutely clean space is necessary. Dust, smoke, Dandruff and saliva may scrap the high-precision polished surface obtained after several hours of work.
2. Rough throwing
After milling, electric discharge, grinding and other processes, the surface can be polished using a rotary surface polishing machine or ultrasonic grinding machine with a rotational speed of 35000-40000 rpm. Commonly used methods include utilizing diameter Φ Remove the white spark layer from the 3mm, WA # 400 wheel. Then there is manual oilstone grinding, with strip shaped oilstones added with kerosene as a lubricant or coolant. The general usage order is # 180~# 240~# 320~# 400~# 600~# 800~# 1000. Many mold manufacturers choose to start from # 400 in order to save time.
3. Semi precision polishing
Semi precision polishing mainly uses sandpaper and kerosene. The number of sandpaper in sequence is: # 400~# 600~# 800~# 1000~# 1200~# 1500. In fact, # 1500 sandpaper is only suitable for quenched mold steel (above 52HRC), not for pre hardened steel, as this may cause surface burns on pre hardened steel parts.
4. Fine polishing
By using grinding paste for precision polishing, 8000010000 can achieve a mirror finish.