Concave aluminum inner surface and edge review

A bright rim with a cloudy concave region needs a different review from general dullness. Select the observations that match the part and compare the source checks for media access, recess depth, orientation and protected edge radius. Keep photographs or inspection records for the inner surface and rim separate so a change in one region cannot conceal damage in the other.

Compare concave-region observations and protected rim checks

Concave area is cloudy, rim is brightEdges are rounded before the inner surface improvesSurface has gray film after finishingBright finish is uneven from part to partSmall scratches remain inside the curve

Select the entries relevant to your review.

Concave aluminum inner surface and edge review - First review field for each entry - Jintaijin — First review field for each entry. Original diagram of qualitative source fields; not a trial outcome.

Separate the inner surface from the rim

Possible causes are hypotheses; source adjustments are conditional review directions, not approved settings or confirmed diagnosis. Check feature access and media lodging on representative parts; chemistry and operating limits require supplied guidance. Keep every selected requirement with the part and the actual trial record. Selecting a row does not show that its acceptance condition has been met.

Record recess access and edge change together

Compare the same incoming surface and protected rim before and after a representative trial. A smaller media direction is not approved until entry, movement, exit and separation are checked. Geometry access, compound compatibility and the supplied machine limits remain independent checks.

Reviewed source reference

Concave area is cloudy, rim is bright

Likely Cause: Media contact is concentrated on the edge

What to Check: Media size, part orientation, recess depth

Recommended Adjustment: Try smaller or better-shaped media that can enter the curve more evenly

Edges are rounded before the inner surface improves

Likely Cause: Cycle time or cutting strength is too high

What to Check: Edge radius, processing time, media aggressiveness

Recommended Adjustment: Reduce cutting stage time and separate smoothing from polishing

Surface has gray film after finishing

Likely Cause: Aluminum fines, unsuitable compound, dirty water

What to Check: Water clarity, compound type, media cleanliness

Recommended Adjustment: Improve rinsing and use aluminum-safe finishing compound

Bright finish is uneven from part to part

Likely Cause: Parts are shielding each other or loading is too dense

What to Check: Part-to-media ratio, batch size, part nesting

Recommended Adjustment: Reduce loading density and prevent parts from stacking in the bowl

Small scratches remain inside the curve

Likely Cause: Media is too coarse or previous machining marks are deep

What to Check: Initial surface roughness, media grade, polishing sequence

Recommended Adjustment: Add a finer finishing stage before final bright polishing

Read the Jintaijin technical article. Source table reviewed 3 October 2026. Possible causes, directions and adjustments remain conditional reference fields.

Concave aluminum inner surface and edge review - Risks or checks remain visible - Jintaijin — Risks or checks remain visible. Original diagram of qualitative source fields; not a trial outcome.

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