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Fully automatic CNC car wheel hub unit outer diameter grinder

CNC Grinding Machine Parameter Table
Machine NameFull-Automatic CNC Grinding Machine for Automobile Hub Unit Flange
Machine Model3MZA1320
Machine PurposeMainly used for the grinding process of hub unit flange
Machining RangeFlange Outer Diameter: 80mm—200mm
                   Grinding Outer Diameter: 28mm—95mm
                   Raceway Diameter: 25—120mm
                   Product Grinding Width: 30mm—90mm
                   Grinding Angle: 0°— 45° Adjustable
                   Maximum Weight: 5-8KG
                   Hardness of Grinding Part: HRC60-64
Precision Requirements After Grinding
Inspection ItemPrecision IndexAssessment MethodInspection QuantityInspection Method
Raceway DiameterWithin Drawing ToleranceCmk ≥1.67Evaluation based on 125 sequentially arranged samplesUsing measuring instruments provided by the buyer
Shaft Diameter/Outer DiameterWithin Drawing ToleranceCmk ≥1.67Evaluation 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＜10μm100% QualifiedBuyer uses special inspection tool
Raceway Roundness≤2μm100% QualifiedBuyer uses roundness tester (2~50 waves)
Raceway PositionD±15μm100% QualifiedBuyer uses G904
Raceway Edge Roundness2∽5: ＜0.5*Product Roundness
6∽15: ＜0.8μm
＞16: ＜0.48μm		100% QualifiedBuyer uses roundness tester (2~50 waves, magnification 10000)
Raceway CurvatureR±30μm100% QualifiedBuyer uses profiler
Sliding Surface Runout Relative to Datum C＜10μm100% QualifiedUsing measuring instruments provided by the buyer
Raceway Ellipticity＜3μm100% QualifiedUsing measuring instruments provided by the buyer
Raceway RoughnessRa ≤0.4μm100% QualifiedBuyer 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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