Quality Assurance
Quality Inspection Process
Inspection flow runs from incoming raw material to outgoing shipment: Incoming inspection, first-article inspection, in-process inspection and out-going inspection, with documented records for traceability.
Quality Control Flow
Checked at every step, not just before shipment.
From incoming raw material to delivered parts, every stage has a defined inspection gate with a clear pass/fail rule. Records are kept at each gate so every part can be traced.
Incoming Inspection
Material certificates, grade, dimensions and surface are verified against the order before material enters production.
| No. | Code | Inspection Item | Acceptance Ref. / Std | Def. Class | Method | Actual Record | Result |
|---|---|---|---|---|---|---|---|
| 1 | C-01 | Hardness (base) | GB/T 230.1 / 231.1 / 4340.1; drawing | MA | Sampling | Sampled 1 sheet, 4 pts, GB/T 231.1 Brinell (F=1471N,D=10mm): 96.5/97.0/95.5/96.0 HBW, avg 96.3 HBW (reject <90) | √ |
| 2 | D-01 | Material grade confirm (PMI) | Drawing grade | CR | Sampling | Handheld XRF (Niton XL3t) 3 pts: Si0.58/Fe0.21/Cu0.26/Mn0.05/Mg1.02/Cr0.19/Zn0.03/Ti0.02, bal Al → 6061 | √ |
| 3 | D-02 | Material cert (MTC/Cert) | EN 10204 3.1/3.2; GB/T 247 | MA | 100% | MTC No.AL-26090712 (EN 10204 3.1): 6061-T6, heat AL6061-2609-07; Rm312/Rp0.2 276/A12.5% (≥290/≥240/≥8); composition matches PMI; archived | √ |
| 4 | D-03 | Heat no. traceability | ISO 9001 8.5.2 | MA | 100% | Label heat AL6061-2609-07 matches MTC; WH entry RK-2609-14 recorded; plate inkjet clear, no mix | √ |
| 5 | E-01 | Product ID (PN/name) | Drawing / order | MA | 100% | 6061-T6 plate 12×300×400, PN YL-6061-12, matches PO-260907-04 & delivery note | √ |
| 6 | E-03 | Material/temper label | Process card | MA | 100% | Label 6061-T6 matches PMI & MTC; intact, no alteration | √ |
| 7 | E-06 | NCR segregation | ISO 9001 8.7 | MA | 100% | Lot conforms, no NC; isolation red tag & bin in place, no NCR records this period | √ |
First Article (FAI)
The first part is checked on critical dimensions and appearance before the batch is released.
| No. | Code | Inspection Item | Acceptance Ref. / Std | Def. Class | Method | Actual Record | Result |
|---|---|---|---|---|---|---|---|
| 1 | A-01 | Linear dims (L/W/H/depth) | Drawing tol.; unspecified GB/T 1804-m / ISO 2768-m | MA | 100% | 2 pcs full-check, mic+CMM: L80.012/80.006, W45.006/44.994, H12.008/11.996mm (80.00±0.05 / 45.00±0.05 / 12.00±0.03) | √ |
| 2 | A-02 | Hole dia (thru/blind/step) | Drawing; GB/T 1804 | MA | 100% | Air gauge+ID mic: main Φ25.011/25.008 (Φ25H7 +0.021/0); 4×Φ4.5 = 4.545~4.553mm (+0.10/0) | √ |
| 3 | A-03 | Hole dist / position / margin | GB/T 1958 (position) | MA | 100% | CMM (Hexagon Global S): dist 40.013/40.008 (40.00±0.05); margin 8.04,7.98/8.02,7.96mm (8.00±0.10) | √ |
| 4 | A-04 | Position tolerance | GB/T 1184 / ASME Y14.5 | MA | 100% | CMM by A|B|C datums: main hole 0.031/0.027; Φ4.5 group 0.038~0.045mm (tol Φ0.08) | √ |
| 5 | A-05 | Flatness | GB/T 1958 | MA | 100% | CMM scan base (datum A): 0.018/0.015mm (drawing 0.05/full length); optical flat ≤0.02 | √ |
| 6 | A-06 | Straightness | GB/T 1958 | MI | 100% | 0-grade straightedge+feeler: side rail gap 0.015/0.012mm in 100mm (0.03/100) | √ |
| 7 | A-07 | Perpendicularity | GB/T 1958 | MA | 100% | CMM: main hole axis to datum A 0.012/0.010mm (0.03); square+indicator 0.015 | √ |
| 8 | A-08 | Parallelism | GB/T 1958 | MA | 100% | Indicator (datum A): side faces 0.008/0.006mm (0.02) | √ |
| 9 | A-09 | Concentricity/coaxiality | GB/T 1958 | MA | 100% | Runout tester: main hole vs counterbore 0.009/0.007mm (Φ0.02) | √ |
| 10 | A-11 | Profile line/surface | GB/T 1958 / ASME Y14.5 | MA | Sampling | 1 pc (SN-01) CMM scan vs CAD: max 0.052mm (tol 0.10), no concentrated out-of-tol | √ |
| 11 | A-13 | Circular/total runout | GB/T 1958 | MA | 100% | V-block+indicator: main hole radial runout 0.011/0.009mm (0.03) | √ |
| 12 | A-15 | Wall thickness (thin-wall) | Drawing | MA | 100% | Ultrasonic 3pts/pc+mic: 1.49/1.52/1.50, 1.51/1.48/1.52mm (1.50±0.10) | √ |
| 13 | A-16 | Thread (go/no-go) | GB/T 197 / ISO 965 (6H/6g) | MA | 100% | M4×0.7-6H plug, 2 pc 4 holes: go all to bottom, no-go ≤1.5/1 thread (≤2) | √ |
| 14 | A-19 | Counterbore dia/depth | Drawing | MI | 100% | Depth mic+plug: CB Φ8.03/8.01, 8.02/8.04 (Φ8.00 +0.10/0); depth 3.18/3.22, 3.19/3.21mm (3.20±0.10) | √ |
| 15 | A-20 | Keyway width/symmetry/depth | GB/T 1095 (parallel key) | MA | 100% | Keyway plug+CMM: W3.005/3.002 (3.00 JS9 ±0.013); D1.83/1.79 (1.80±0.10); L12.04/11.98 (12.00±0.10); symm 0.018/0.014 (0.05) | √ |
| 16 | A-22 | Datum consistency | Process file / drawing | MA | 100% | Process card CNC-0427 Rev.B: datum A (base)/B (Φ25 main)/C (end face) match drawing; CMM datum verified | √ |
| 17 | B-01 | Burr / flash | Limit sample; customer spec | MI | 100% | 2pc visual+feel vs limit sample (5×): burr ≤0.03mm (≤0.10); holes chamfered, no flash | √ |
| 18 | B-05 | Residue / unmachined / missed op | Routing card | MA | 100% | 2pc vs routing OP10~OP80 (8 ops): card signed, no missed; no residue in keyway root/counterbore bottom | √ |
| 19 | B-14 | Stripped/broken thread | GB/T 197 | MA | 100% | 2pc 4 M4 holes, go-no-go+5×: profile complete, no broken/stripped thread, no lip | √ |
| 20 | B-15 | Assembly interference/looseness | Assembly drawing | MA | 100% | Trial-fit with cover MK-CV-0426: alignment ok, no interference; fixture JG-0427 no play, no wobble | √ |
| 21 | C-07 | Assembly fit (trial) | Assembly drawing | MA | 100% | Φ25 main hole vs bearing seat: smooth push, clearance 0.008~0.011mm (0.005~0.020), no bind | √ |
| 22 | E-01 | Product ID (PN/name) | Drawing / order | MA | 100% | First-article tag: PN MK-BR-0427, name, Rev.B, matches PO-260917-04; 2 pc marked "pending first-article" | √ |
| 23 | E-06 | NCR segregation | ISO 9001 8.7 | MA | 100% | FAI conforms, no NC; red tag in place; released to mass production, "pending" mark removed | √ |
In-Process (IPQC)
Key processes are checked continuously; any anomaly stops the line for correction.
| No. | Code | Inspection Item | Acceptance Ref. / Std | Def. Class | Method | Actual Record | Result |
|---|---|---|---|---|---|---|---|
| 1 | A-16 | Thread (go/no-go) | GB/T 197 / ISO 965 (6H/6g) | MA | 100% | 3 rounds (09-17 10:20, 09-17 14:05, 09-18 09:40), 2pc/round, 6pc 12 holes: M4×0.7-6H go all seated, no-go 0~1.5 thread | √ |
| 2 | B-01 | Burr / flash | Limit sample; customer spec | MI | 100% | 3 rounds, 2pc each, visual+feel: burr 0.02~0.05mm (≤0.10); no flash at keyway ends | √ |
| 3 | B-05 | Residue / unmachined / missed op | Routing card | MA | 100% | 3 rounds routing OP30→OP70 checked per process: cards signed continuous; no residue in keyway root, M4 hole bottom clean | √ |
| 4 | B-08 | Burn / discoloration (thermal) | Customer spec | MA | 100% | 3 rounds, 40W visual: no burn/discoloration, uniform silver finish; coolant conc. 8.2% (std 7~10%) | √ |
| 5 | B-14 | Stripped / broken thread | GB/T 197 | MA | 100% | 6pc 12 holes go-no-go+5×: profile complete; tap T05 180 holes (limit 200), tool-change note HD-2609-06 issued, 2pc recheck OK | √ |
| 6 | E-01 | Product ID (PN/name) | Drawing / order | MA | 100% | WIP card PN MK-BR-0427, batch B2609-013 match part; card XL-2609-05 continuous, machine/op filled | √ |
| 7 | E-06 | NCR segregation | ISO 9001 8.7 | MA | 100% | No NC during patrol; red tag & bin in place, no residue; HD-2609-06 closed | √ |
Final Inspection (FQC)
Finished parts are checked on critical dimensions, appearance, function and cleanliness before they are accepted for shipment.
| No. | Code | Inspection Item | Acceptance Ref. / Std | Def. Class | Method | Actual Record | Result |
|---|---|---|---|---|---|---|---|
| 1 | A-01 | Linear dims (L/W/H/depth) | Drawing tol.; unspecified GB/T 1804-m / ISO 2768-m | MA | 100% | 20pc full-check caliper/mic + CMM 5pc: L80.002~80.038, W44.971~45.026, H11.986~12.014mm (80.00±0.05/45.00±0.05/12.00±0.03); caliper vs CMM ≤0.005 | √ |
| 2 | A-02 | Hole dia (thru/blind/step) | Drawing; GB/T 1804 | MA | 100% | 20pc air gauge: main Φ25.004~25.017 (Φ25H7 +0.021/0); 4×Φ4.5×20=80 holes Φ4.531~4.572 (+0.10/0) all in tol | √ |
| 3 | A-03 | Hole dist/position/margin | GB/T 1958 (position) | MA | 100% | 20pc CMM: dist 39.982~40.021 (40.00±0.05); margin 7.94~8.06mm (8.00±0.10) | √ |
| 4 | A-04 | Position tolerance | GB/T 1184 / ASME Y14.5 | MA | 100% | 20pc CMM A|B|C: main hole 0.018~0.036, Φ4.5 group 0.025~0.048mm (tol Φ0.08) | √ |
| 5 | A-05 | Flatness | GB/T 1958 | MA | 100% | 20pc CMM scan base A: 0.009~0.021mm (0.05/full length) | √ |
| 6 | A-06 | Straightness | GB/T 1958 | MI | 100% | 20pc 0-grade straightedge+feeler: side rail 0.008~0.017mm/100mm (0.03/100) | √ |
| 7 | A-07 | Perpendicularity | GB/T 1958 | MA | 100% | 20pc CMM: main axis to A 0.007~0.015mm (0.03) | √ |
| 8 | A-08 | Parallelism | GB/T 1958 | MA | 100% | 20pc indicator A: side faces 0.004~0.011mm (0.02) | √ |
| 9 | A-09 | Concentricity/coaxiality | GB/T 1958 | MA | 100% | 20pc runout tester: main vs counterbore 0.005~0.013mm (Φ0.02) | √ |
| 10 | A-10 | Roundness/cylindricity | GB/T 1958 | MA | Sampling | 4pc (SN-03/-08/-14/-19) roundness machine min-zone: round 0.003~0.006 (0.010); cylindricity 0.005~0.009 (0.015) | √ |
| 11 | A-11 | Profile line/surface | GB/T 1958 / ASME Y14.5 | MA | Sampling | 4pc CMM vs CAD: 0.031~0.058mm (0.10), no concentrated out-of-tol area | √ |
| 12 | A-13 | Circular/total runout | GB/T 1958 | MA | 100% | 20pc V-block+indicator: main hole radial runout 0.006~0.014mm (0.03) | √ |
| 13 | A-14 | Angle / taper | GB/T 1958 | MA | Sampling | 5pc universal protractor+CMM: rib 59.92°~60.09° (60.00±0.25°); guide 14.95°~15.04° (15.00±0.10°) | √ |
| 14 | A-15 | Wall thickness (thin-wall) | Drawing | MA | 100% | 20pc ultrasonic+mic 3pts/pc=60: 1.46~1.54mm (1.50±0.10) | √ |
| 15 | A-16 | Thread (go/no-go) | GB/T 197 / ISO 965 (6H/6g) | MA | 100% | 20pc 40 holes M4×0.7-6H: go all seated, no-go 0~2 threads (≤2) | √ |
| 16 | A-17 | Thread pitch dia/profile | GB/T 197 | MI | Sampling | 4pc thread mic+CMM: M4×0.7-6H pitch dia 3.689~3.736 (3.663~3.781); flank 60.0°~60.3°, complete | √ |
| 17 | A-18 | Chamfer / radius | Drawing | MI | 100% | 20pc chamfer/R gauge+projector: C0.5 ×14 each measured C0.46~0.55 (C0.50±0.10); R2.00 R1.96~2.08 | √ |
| 18 | A-19 | Counterbore dia/depth | Drawing | MI | 100% | 20pc depth mic+plug: Φ8.01~8.07 (Φ8.00 +0.10/0); depth 3.14~3.26mm (3.20±0.10) | √ |
| 19 | A-20 | Keyway width/symmetry/depth | GB/T 1095 (parallel key) | MA | 100% | 20pc keyway plug+CMM: W2.992~3.009 (3.00 JS9 ±0.013); D1.74~1.86 (1.80±0.10); symmetry 0.009~0.024 (0.05) | √ |
| 20 | A-21 | Unspecified tolerance | GB/T 1804(f/m/c/v) / ISO 2768 | MI | 100% | 20pc per GB/T 1804-m, 12 spots each (6 linear, 2 angle, 4 chamfer): max +0.08mm (m-grade ±0.1~±0.3) all conform | √ |
| 21 | B-01 | Burr / flash | Limit sample; customer spec | MI | 100% | 20pc visual+feel 5×: burr 0.01~0.05mm (≤0.10); no flash at holes/keyway/root | √ |
| 22 | B-02 | Sharp edge/corner | Drawing R req. | MI | 100% | 20pc visual+scratch paper: sharp edges broken C0.5 ×14 each chamfered; no hook, smooth; R2.00 transition smooth | √ |
| 23 | B-03 | Scratch/dent/impact | Appearance grading: A none / B minor / C relaxed | MA | 100% | 20pc 40W, 30~50cm: A none; B 2× L0.3mm (≤1.0 non-dense); C 3× ≤0.5mm (relaxed) | √ |
| 24 | B-04 | Tool/vibration/step marks | Customer appearance spec | MI | 100% | 20pc visual+roughness: mill face Ra1.6, non-fit Ra3.2; no chatter; step height diff ≤0.02mm | √ |
| 25 | B-05 | Residue/unmachined/missed op | Routing card | MA | 100% | 20pc vs routing: OP10~OP80 8 ops complete, cards signed; keyway root/counterbore bottom/thin-wall inside no residue | √ |
| 26 | B-06 | Corner/root cleaning | Drawing | MI | 100% | 20pc visual+feeler R2.00: no residue at root; keyway ends cleaned, natural arc, no stress concentration | √ |
| 27 | B-07 | Hole chamfer / tap chip removal | Process requirement | MI | 100% | 20pc visual+needle+compressed air: 4×Φ4.5 & 2×M4 chamfered; no chips in holes, needle clear | √ |
| 28 | B-08 | Burn/discoloration (thermal) | Customer spec | MA | 100% | 20pc 40W: no burn/discolor (blue/purple/tan); uniform silver; thin-wall & keyway root no thermal damage | √ |
| 29 | B-09 | Cleanliness (chips/oil/foreign) | ISO 16232 / VDA 19; medical special | MA | 100% | 20pc white-cloth + 5pc ultrasonic weigh: no visible chips/oil; impurity 0.6~0.9mg/pc (≤5mg ISO 16232) | √ |
| 30 | B-10 | Appearance grading | Customer appearance map | MI | 100% | 20pc vs MK-QS-011 item by item: A 0 defects; B 2× ≤0.3mm (≤1.0); C 3× ≤0.5mm (relaxed) → conform | √ |
| 31 | B-13 | Marking/laser code (PN/trace) | Drawing / traceability spec | MA | 100% | 20pc laser: PN MK-BR-0427, batch B2609-013, SN SN2609013-01~20, height 1.5mm; scanned match list, clear | √ |
| 32 | B-14 | Stripped/broken thread | GB/T 197 | MA | 100% | 20pc 40 M4 holes go-no-go+visual: profile complete; new tap T05 62 holes, no anomaly | √ |
| 33 | C-01 | Hardness (base) | GB/T 230.1 / 231.1 / 4340.1; drawing | MA | Sampling | 4pc (SN-03/-08/-14/-19) GB/T 231.1 3pts each: 95.5~97.5 HBW avg 96.4 (≥90); no soften after machining | √ |
| 34 | C-10 | Dimension stability (aging re-test) | Process file | MA | Sampling | Natural aging 48h 23±2℃, 4pc: Φ25H7 +0.003~+0.005, dist40 +0.004~+0.007, flatness ≤0.004 (limit ≤0.010) → conform | √ |
| 35 | D-03 | Heat no. traceability | ISO 9001 8.5.2 | MA | 100% | Chain: heat AL6061-2609-07 (MTC AL-26090712)→WH RK-2609-14→cut XL-2609-05→CNC-03→op Wu Cheng/Zheng Kai→batch B2609-013→SN01~20, no gap | √ |
| 36 | E-01 | Product ID (PN/name) | Drawing / order | MA | 100% | 20pc labels: PN MK-BR-0427, name, 20pcs, batch B2609-013, match PO-260917-04; position uniform | √ |
| 37 | E-02 | Batch / serial no. | Traceability spec | MA | 100% | Scan 20 SN SN2609013-01~20 unique, no dup/gap; batch matches routing card XL-2609-05 | √ |
| 38 | E-03 | Material/temper label | Process card | MA | 100% | Label 6061-T6 matches IQC PMI & MTC; 2pc hardness recheck 96.0/96.5 HBW, no anneal soften after machining | √ |
| 39 | E-04 | Record completeness | ISO 9001 9.1; control plan | MA | 100% | IQC-2609-014 (09-14), FAI-2609-013 (09-16), IPQC 3 rounds (09-17~18), this FQC (09-21) signed; CP-MK-0427 Rev.B all items recorded | √ |
| 40 | E-06 | NCR segregation | ISO 9001 8.7 | MA | 100% | 20pc all conform, no NC; finished isolation area markers intact, no NCR records | √ |
Outgoing Inspection (OQC)
Quantity, packaging, rust prevention, labels and accompanying documents are verified before the shipment leaves.
| No. | Code | Inspection Item | Acceptance Ref. / Std | Def. Class | Method | Actual Record | Result |
|---|---|---|---|---|---|---|---|
| 1 | B-03 | Scratch / dent / impact | Appearance grading: A none / B minor / C relaxed | MA | 100% | 20pc pre-ship visual 40W, 30~50cm: A none; B 2× ≤0.3mm (≤1.0); C 3× ≤0.5mm; matches FQC, no new damage | √ |
| 2 | B-09 | Cleanliness (chips/oil/foreign) | ISO 16232 / VDA 19; medical special | MA | 100% | 20pc white-cloth wipe+air blow: no chips/oil/fingerprint; threads & counterbores clean | √ |
| 3 | B-10 | Appearance grading | Customer appearance map | MI | 100% | 20pc vs MK-QS-011: A none; B/C same as FQC, no new; grade conforms, released | √ |
| 4 | B-13 | Marking / laser code | Drawing / traceability spec | MA | 100% | 20pc laser: PN MK-BR-0427, batch B2609-013, SN SN2609013-01~20; scanned match packing, clear after cleaning/rust-proof | √ |
| 5 | E-01 | Product ID (PN/name) | Drawing / order | MA | 100% | Part+bale labels: PN MK-BR-0427, 20pcs (10×2), batch B2609-013, match PO-260917-04 & DN-2609-018 | √ |
| 6 | E-02 | Batch / serial no. | Traceability spec | MA | 100% | Scan 20 pcs SN2609013-01~20 unique, no dup/gap; batch B2609-013 → heat AL6061-2609-07 | √ |
| 7 | E-06 | NCR segregation | ISO 9001 8.7 | MA | 100% | Shipment 20pc all conform, no NC; warehouse isolation markers intact; release FX-2609-018 signed | √ |
| 8 | F-01 | Final pre-ship cleaning | Cleanliness requirement | MA | 100% | 20pc wash→blow→lint-free wipe, white cloth clean; packed within 30min, no re-contamination | √ |
| 9 | F-02 | Rust prevention | Customer spec | MA | 100% | 20pc VCI rust inhibitor (nitrite-free): +0.03~0.08g/pc (std 0.02~0.10, net 86.4g); uniform film, no runs | √ |
| 10 | F-03 | Moisture-proof packing | Export packing spec | MI | Sampling | 6 bags sampled (3/box): foil seal continuous, 5g desiccant in, humidity card blue (dry); intact | √ |
| 11 | F-04 | Cushion / partition anti-impact | Packing spec | MI | 100% | 20pc in EVA cells, no contact; bubble wrap ≥20mm all around; no rattle/spill on shake | √ |
| 12 | F-05 | Qty / accessory check | Packing list | MA | 100% | Count 20pc + weigh: net 86.4g/pc, 1.728kg total (list 1.73kg); access: 2 CoC, 1 MTC copy, 2 humidity cards | √ |
| 13 | F-06 | Box label / marks | Order | MA | 100% | 2 boxes: receiver, PN MK-BR-0427, 10/box, batch B2609-013, carton 1/2,2/2; marks match DN, barcode scans | √ |
| 14 | F-07 | Dossier (CoC/MTC/FAI) | Order requirement | MA | 100% | Per list: 2 CoC, 1 MTC AL-26090712 copy, 1 FAI FAI-2609-013 copy, 1 outgoing inspection — complete & correct | √ |
| 15 | F-08 | Shipment photo archive | Quality system doc | MI | 100% | 8 photos (3 single, 2 EVA packing, 2 label, 1 seal) saved to QM/出货留档/2026/B2609-013 | √ |
