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Fully automatic CNC car wheel hub unit outer ring groove grinder

Precision Index Table

  

Precision Index
Inspection ItemPrecision IndexAssessment MethodInspection QuantityInspection Method
Raceway DiameterWithin Drawing ToleranceCmk ≥1.67Evaluation based on 125 sequentially arranged samplesUsing measuring instruments provided by the buyer
Mutual Difference of Double Raceway Diameters＜5μm100% QualifiedEvaluation based on 125 sequentially arranged samplesUsing measuring instruments provided by the buyer
Seal DiameterWithin Drawing ToleranceCmk ≥1.67Evaluation based on 125 sequentially arranged samplesUsing measuring instruments provided by the buyer
Raceway Profile＜2μm100% QualifiedEvaluation based on 125 sequentially arranged samples, randomly select 30 piecesBuyer uses roughness profiler
Raceway Diameter Runout Relative to Datum C＜15μm100% QualifiedRandomly select 30 piecesBuyer uses special inspection tool
Raceway Roundness≤2μm100% QualifiedEvaluation based on 125 sequentially arranged samples, randomly select 30 piecesBuyer uses roundness tester (2~50 waves)
Raceway Edge Roundness2∽5: ＜0.4*Product Roundness
6∽15: ＜0.8μm
＞16: ＜0.48μm		100% QualifiedEvaluation based on 125 sequentially arranged samples, randomly select 30 piecesBuyer uses roundness tester (0~50 waves, at 10000x magnification)
Raceway PositionC±15μm100% QualifiedRandomly select 30 piecesBuyer uses G904
Raceway CurvatureR±30μm100% QualifiedRandomly select 30 piecesBuyer uses profiler
Parallelism
(D Raceway Center to D)		8μm100% QualifiedRandomly select 30 piecesUsing measuring instruments provided by the buyer
Step Ellipticity＜6μm100% QualifiedRandomly select 30 piecesUsing measuring instruments provided by the buyer
Raceway Center DistanceD±10μm100% QualifiedRandomly select 30 piecesBuyer uses profiler
Raceway RoughnessRa ≤0.4μm100% QualifiedRandomly select 30 piecesBuyer uses profiler

u During preliminary and final acceptance, the assessment of the above precision indicators is based on samples formed by 1 hour of continuous production
                       (Sample quantity for final acceptance sampling inspection ≥ 30 pieces)
                        u Raceway profile (curved part) Pt evaluation is based on 80% raceway length, measuring ball radius: 0.5mm
                       u The capability test of raceway diameter is carried out as follows: after 1 hour of production, 50 samples are arranged sequentially. Evaluation is based on ±3 standard deviations
                       u No appearance defects such as burn, collision damage, chatter marks are allowed
                       u Other dimensions meet drawing requirements

Grinding Cycle TimeSingle machine cycle time (including loading, unloading and dressing) ＜ 45s (under maximum grinding allowance condition)
                   Theoretical continuous output per hour ＞ 65 pieces/hour
All the above grinding results are based on the equipment fully preheated under automatic grinding condition and continuously processing products in automatic mode for 30 minutes.

 


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