Polishing technology of caster support
Basic mirror caster polishing steps
1. The white layer and over tempered layer on the front EDM surface are completely removed with

alumina grinding wheel.

2. Polish the surface with an oilstone strip (from coarse to fine) as follows: 180 # - 240 # - 320 # -

400 # - 600 # - 800 # (straighten the flatness) - 1000 # (800 # is usually used to correct the surface

flatness to avoid corrugation during subsequent caster polishing)

3. Use SiC sandpaper (from coarse to fine) to polish the surface as follows: 400 # - 600 # - 800 # -

1000 # - 1200 # - 1500 # - 2000 # (generally, 1500 # sandpaper is not recommended for pre

hardening steel to prevent surface overheating)

4. For 9um, use wooden strips (soft), for 6um, for 3um, use felt rollers, for 1um, use 100% cotton,

and polish casters with diamond paste; 9um (1800 #) - 6um (3000 #) - 3um (8000 #) - 1um (14000 #)

if finer polishing is required, such as 1 / 2um (60000 #) and 1 / 4um (100000 #), please ensure that it

is carried out in a dust-free environment.

5. When sanding with sandpaper, the sandpaper shall be adhered to the wood strip or bamboo chip:

wood strip or bamboo chip (hard) - suitable for low hardness, plane or corner grinding, wood strip or

bamboo chip (soft) - suitable for high hardness, round surface or complex shape grinding

6. Before each conversion of sandpaper or diamond paste, the hand and die surface must be

thoroughly cleaned. The workpiece shall be cleaned with mold washing water and soap.

7. Each time the sandpaper or oilstone strip is changed, the grinding direction (45-90 degrees)

shall be changed to ensure that the previous grinding mark is completely removed. In addition, it is

recommended to grind once when grinding with 800# or finer sandpaper.

8. Each grinding caster polishing shall start from the difficult polishing parts (such as corners and

grooves) and try not to polish the round. A hard caster polishing tool shall be selected for caster

polishing at the corners.

9. Each caster polishing tool can only use diamond paste of one particle size and be stored in a

dust-free container. Each container containing grinding or caster polishing tools shall store only

one grinding caster polishing tool. During manual caster polishing, diamond paste is applied to the

caster polishing tool, and during mechanical caster polishing, diamond paste is applied to the

workpiece.

10. Each caster polishing shall be completed in the shortest time. The caster polishing strength

shall also be adjusted with the hardness of the caster polishing tool and the particle size of the diamond

paste. For the smallest diamond paste, the caster polishing pressure shall only be equal to the weight

of the caster polishing tool.

11. The last caster polishing shall be carried out in the direction of product stripping. Before converting

diamond paste from sandpaper, the surface shall be thoroughly cleaned. Oil stains on the surface can

be effectively removed by using 100% cotton and a small amount of benzene.

12. If the surface is not processed by EDM, it can be processed directly from step 3. In addition, if the

dielectric liquid is mixed with silicon powder during surface EDM, the surface finish of the die will be

improved after processing. Therefore, caster polishing can be directly started from step 4 after

processing.

13. If the mold needs heat treatment, the surface shall be polished with 400# about sandpaper

before heat treatment.

14. If the mold needs surface ammoniation treatment, the surface shall be polished with 1200#

sandpaper before ammoniation, and then the white layer (about 20um) on the ammoniated surface

shall be completely removed with 800# sandpaper after ammoniation.

15. Before storing the mold, spray anti rust oil and ensure that the storage environment is dry and

dust-free, so as to prevent the surface from corrosion.

16. If orange peel is found during caster polishing, all defects shall be completely removed from the

last grinding process (such as 1200# sandpaper), and then the caster shall be polished again. The

pressure used for caster polishing shall be lower than before. If orange peel is still found after caster

polishing, it is recommended to conduct tempering treatment before RE polishing caster; If orange

peel is still found after caster polishing, it is recommended to increase the hardness (if allowed) and

then polish the caster again.

17. If a pinhole is found during caster polishing, use 400# sandpaper to grind off the pinhole, and

then polish the caster again.

AGV Casters Parameter

AGV Casters Describe

AGV Casters Material

AGV Casters Size

AGV Casters Scope of application

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