generating gear grinding infeed in mm per stroke (pass) infeed in mm per stroke (pass) feed rate in...
TRANSCRIPT
win- win i n s i d eW INTERTHUR
GENERATING GEAR GRINDINGGENERATING GEAR GRINDING
Infeed in mmper stroke (pass)
Infeed in mmper stroke (pass)
Feed rate in mm/Rev.
Feed rate in mm/Rev.
Shift MovementShift Movement
win- win i n s i d eW INTERTHUR
Grinding Perfect Gears: A Tough Puzzle? Grinding Perfect Gears: A Tough Puzzle?
DressingDressing Grinding WheelsGrinding Wheels
CoolantCoolantQualityetc.
Qualityetc.
MachineMachine
PerfectGears
PerfectGears
win- win i n s i d eW INTERTHUR
Causes of Gear Errors: Profile Deviations Causes of Gear Errors: Profile Deviations
win- win i n s i d eW INTERTHUR
Causes of Gear Errors: Lead ErrorCauses of Gear Errors: Lead Error
win- win i n s i d eW INTERTHUR
Causes of Gear Errors: Burning & CrackingCauses of Gear Errors: Burning & Cracking
win- win i n s i d eW INTERTHUR
Causes of Gear Errors: ConcentricityCauses of Gear Errors: Concentricity
win- win i n s i d eW INTERTHUR
- good profile form
1 1 Profile Form Profile Form
win- win i n s i d eW INTERTHUR
- 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
2 2 Profile Form Profile Form
win- win i n s i d eW INTERTHUR
- unbalanced grinding wheel- spindel, workpiece out-of round- wrong change gears 3 3 Profile Form Profile Form
win- win i n s i d eW INTERTHUR
- wrong profile angle on grinding wheel- wrong value for differential change gears (AZA, NZA)
4 4 Profile Form Profile Form
win- win i n s i d eW INTERTHUR
- wobble, faulty fixturing tooling- tailstock centres damaged/faulty- workpiece spindle bearings damaged 5 5 Profile Form Profile Form
win- win i n s i d eW INTERTHUR
- unfavorable gear flank/ grinding wheel contact sequence- profile loss on wheel, shifting too small- grinding wheel too soft 6 6 Profile Form Profile Form
win- win i n s i d eW INTERTHUR
- insufficient profiling of grinding wheel- tooth profile of grinding wheel too thick
7 7 Profile Form Profile Form
win- win i n s i d eW INTERTHUR
- root relief of grinding wheel excessive
one or two sidedone or two sided
8 8 Profile Form Profile Form
win- win i n s i d eW INTERTHUR
- correct alignment
9 9 AlignmentAlignment
win- win i n s i d eW INTERTHUR
- insufficient overtravel
10 10 AlignmentAlignment
win- win i n s i d eW INTERTHUR
- grinding wheel imbalance- feed per rev. excessive- grinding spindle ouf-of round- flange damaged
11 11 AlignmentAlignment
win- win i n s i d eW INTERTHUR
- insufficient load angle compensation- error in spindle drive system
12 12 AlignmentAlignment
win- win i n s i d eW INTERTHUR
- wobble, centres, fixturing faulty- tailstock centre inprecise- workpiece spindle out-of-round 13 13 AlignmentAlignment
win- win i n s i d eW INTERTHUR
- work head inclination angle wrongly set- backlash in change gears incorrect
14 14 AlignmentAlignment
win- win i n s i d eW INTERTHUR
- wrong value for differential gears- differential gear train out-of-round
15 15 AlignmentAlignment
win- win i n s i d eW INTERTHUR
- crowning erratic on left flank due to excessive clearance between stylus and stylus bushing (non-CNC machines only) 16 16 AlignmentAlignment
win- win i n s i d eW INTERTHUR
- multi-start grindng when number of teeth divided by number of starts equals even, whole number.