Mirror polishing at narrow area of mold

For the polishing of the narrow area of mold, high-quality steel and good pre-processing are the basis of polishing. Only with good crafts and techniques can an excellent polishing effect be achieved.

1. Mould steel

Use high-quality mirror steel such as S136, M333, 1.2083, etc., and must be heat treated to 50~53 degrees

2. Pre-processing

Use high-speed machining center or mirror electric discharge machining, and there should be no bomb knives or electric discharge carbon deposits.

3. Polishing tools and consumables

①A small polishing machine with stable spindle;
②Mold polishing whetstone of 1500 mesh and 2000 mesh (Bellstones is fine);
③Pig hair brush with a diameter of 5mm;
④ 15μm, 5μm, 3μm, 1μm diamond paste;
⑤3mm diameter cylindrical cork stick or bamboo stick;
⑥Long fiber pure cotton;
⑦Bamboo chopsticks for polishing;
⑧ Kerosene

4. Trimming of polishing consumables

① Use a small file to trim polishing oilstones into a small rectangular strip with a smaller width than the narrow width of the workpiece. It is standard to be able to move back and forth between the narrow strip of the workpiece. Make a shallow groove at the center point of the upper end of the small rectangular oilstone.
②According to the width of the narrow strip of the workpiece, trim the diameter of the bristles to a little smaller than the width of the narrow strip of the workpiece.
③ Sharpen the tip of the wooden stick

5. Polishing process

①Put the trimmed small rectangular oilstone on the narrow area of the workpiece, drip kerosene, and use bamboo chopsticks to move the oilstone evenly on the shallow groove on the oilstone. Until the knife pattern or fire pattern is ground clean. Attention should be paid to timely trimming the bottom end of the small oil stone, keeping its bottom surface must be flat. Make a smaller oilstone clear corner at the corner R in the cavity. Do not bring it straight across the cross, and grind in sections, otherwise the R angle will rise due to improper grinding. If there are deep traces of whetstone falling off the sand, save it with sandpaper.
② Use 15μm diamond paste and trimmed pig hair brush to remove the 2000-mesh oilstone traces.
③Wrap the cotton on the tip of the wooden stick, install it on the polishing machine, and use 5μm diamond paste to remove the brush marks.
④Wrap the cotton on the tip of the wooden stick, install it on the polishing machine, and use 1μm diamond paste to remove the brush marks.

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