Plastic part： TST-PC cover for refrigeration control system
W/ texture(chemical etching in mold) on part surface
*Chemical etching rather than EDM processing due to bigger grains of texture
In plastic raw material: ABS(MABS)
Plastic mold: 1x2 cavities; common gate type, w/ same gate position at 2 small column ends like part sample; 2-plate type
Mold base P20 steel; Mold core 718H steel
STP format drawing for part
STP format mold drawing
Parts from mold test before polish and texture making(visual color difference from shooting environment)
Core side after modification
To get tight assembly with enclosure, modify the cover at following positions:
- Balls(i.e. small columns) which connects the enclosure serves as hinge function, reduced plasic in crosssection by around 0.14 ~ 0.15mm
-Increase plastic 0.50mm at both sides at width direction(hinge side): Use new-made copper electrode bar for EDM machining to get 0.50mm increase each side on core, with old texture kept. While use new whole copper electrode block for EDM machining on cavity to get 0.50mm each side, 'step' can be avoided on cover's visible surfaces, the texture is re-made by subcontraction.
After modifications, at each each hinge side there is 0.35mm gap beween cover and enclosure when the cover is closed, cover can open and close freely.