GENERATING GEAR GRINDING Infeed in mm per stroke (pass) Infeed in mm per stroke (pass) Feed rate in...

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GENERATING GEAR GRINDINGGENERATING GEAR GRINDING

Infeed in mmper stroke (pass)

Feed rate in mm/Rev.

Shift MovementShift Movement

Grinding Perfect Gears: A Tough Puzzle? Grinding Perfect Gears: A Tough Puzzle?

DressingDressing Grinding WheelsGrinding Wheels

CoolantCoolantQualityetc.

Qualityetc.

MachineMachine

PerfectGears

Causes of Gear Errors: Profile Deviations Causes of Gear Errors: Profile Deviations

Causes of Gear Errors: Lead ErrorCauses of Gear Errors: Lead Error

Causes of Gear Errors: Burning & CrackingCauses of Gear Errors: Burning & Cracking

Causes of Gear Errors: ConcentricityCauses of Gear Errors: Concentricity

- good profile form

1 1 Profile Form Profile Form

- diamond worn on one side- insufficent grinding allowance- insufficient amount of shifting- grit size of wheel too fine

one or two sidedone or two sided

- unbalanced grinding wheel- spindel, workpiece out-of round- wrong change gears 3 3 Profile Form Profile Form

- wrong profile angle on grinding wheel- wrong value for differential change gears (AZA, NZA)

- wobble, faulty fixturing tooling- tailstock centres damaged/faulty- workpiece spindle bearings damaged 5 5 Profile Form Profile Form

- unfavorable gear flank/ grinding wheel contact sequence- profile loss on wheel, shifting too small- grinding wheel too soft 6 6 Profile Form Profile Form

- insufficient profiling of grinding wheel- tooth profile of grinding wheel too thick

- root relief of grinding wheel excessive

one or two sidedone or two sided

- correct alignment

9 9 AlignmentAlignment

- insufficient overtravel

- grinding wheel imbalance- feed per rev. excessive- grinding spindle ouf-of round- flange damaged

- insufficient load angle compensation- error in spindle drive system

- wobble, centres, fixturing faulty- tailstock centre inprecise- workpiece spindle out-of-round 13 13 AlignmentAlignment

- work head inclination angle wrongly set- backlash in change gears incorrect

- wrong value for differential gears- differential gear train out-of-round

- crowning erratic on left flank due to excessive clearance between stylus and stylus bushing (non-CNC machines only) 16 16 AlignmentAlignment

- multi-start grindng when number of teeth divided by number of starts equals even, whole number.

GENERATING GEAR GRINDING Infeed in mm per stroke (pass) Infeed in mm per stroke (pass) Feed rate in...

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