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IMPROVING PROCESS PERFORMANCE BY REDUCING INPROCESS  REJECTION USING SIX  SIGMA METHODOLOGY
CONTENTS ,[object Object],[object Object],[object Object],[object Object],[object Object]
INTRODUCTION ,[object Object],[object Object],[object Object],[object Object]
SIX  σ  METHODOLOGY ,[object Object],[object Object]
DMAIC FLOW CHART DEFINE MEASURE ANALYSE PROCESS OPPORTUNITY LIKELY  BENIFITS CURRENT PERFORMANCE SOURCES OF VARIABILITY KEY VARIABLES RELATIONSHIPS IMPLEMENTED SOLUTION PREDECTED RESULTS IMPROVE CONTROL CONTROL VARIABLES PLAN FOR STABILITY
CASE STUDY ,[object Object],[object Object]
DEFINE PHASE ,[object Object],[object Object],Receiving casting from foundry department Loading the casting at station 1 by  pneumatic feeder continue
Mounting hole drilling operation Drilling operation by Φ 3 drill Tapping operation by M6 tap Main bore drilling by Φ 15 solid carbide tool Followed by reaming by Φ 15.87 reamer Boot grooving operation by form tool Unloading the job and placing it to  storage bin
MEASURE PHASE 3586 205 57161 November 4124 290 70319 October 5804 344 59265 September PPM Rejected jobs Total production Month
DEFECTWISE REJECTION 0 28 12 Poor finish 35 14 85 M 6 damaged 0 15 19 Acidic etching 0 10 25 Groove undersize 7 8 15 Groove steps 8 25 16 Bore or tool mark 15 25 09 Face damaged 50 70 76 M 10 damaged 90 85 107 Main bore shift NO. OF  JOBS REJECTED DEFECT
ANALYSIS PHASE ,[object Object]
Main causes of rejection ,[object Object],[object Object],[object Object],[object Object]
Analysis of main bore shift ,[object Object]
Analysis of M10 shift ,[object Object]
IMPROVEMENT PHASE ,[object Object],Implemented Hydraulic leakage corrected Hydraulic leakage causing pressure drop Bore shift Implemented V block rework for perfect clamping V block damaged Bore shift Implemented Proper fettling of liquid metal during casting process Excess material job M 10 shift Implemented Reservoir added to reduce pressure drop Air pressure drop below 0.8 Mpa M 10 shift Present status Corrective action Current status Concerned parameter
Result ,[object Object],3.62 1525 0.00152 58990 90 December 2.92 3586 0.00358 57161 205 November 2.96 4124 0.00297 70288 299 October 2.75 5804 0.00584 59265 344 September Sigma rating ppm Rejections per unit No. Of Units Produced No. Of rejections Month
[object Object],[object Object],[object Object],[object Object],[object Object]
CONCLUSION ,[object Object],[object Object],[object Object]

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Six Sigma Case Study

  • 1. IMPROVING PROCESS PERFORMANCE BY REDUCING INPROCESS REJECTION USING SIX SIGMA METHODOLOGY
  • 2.
  • 3.
  • 4.
  • 5. DMAIC FLOW CHART DEFINE MEASURE ANALYSE PROCESS OPPORTUNITY LIKELY BENIFITS CURRENT PERFORMANCE SOURCES OF VARIABILITY KEY VARIABLES RELATIONSHIPS IMPLEMENTED SOLUTION PREDECTED RESULTS IMPROVE CONTROL CONTROL VARIABLES PLAN FOR STABILITY
  • 6.
  • 7.
  • 8. Mounting hole drilling operation Drilling operation by Φ 3 drill Tapping operation by M6 tap Main bore drilling by Φ 15 solid carbide tool Followed by reaming by Φ 15.87 reamer Boot grooving operation by form tool Unloading the job and placing it to storage bin
  • 9. MEASURE PHASE 3586 205 57161 November 4124 290 70319 October 5804 344 59265 September PPM Rejected jobs Total production Month
  • 10. DEFECTWISE REJECTION 0 28 12 Poor finish 35 14 85 M 6 damaged 0 15 19 Acidic etching 0 10 25 Groove undersize 7 8 15 Groove steps 8 25 16 Bore or tool mark 15 25 09 Face damaged 50 70 76 M 10 damaged 90 85 107 Main bore shift NO. OF JOBS REJECTED DEFECT
  • 11.
  • 12.
  • 13.
  • 14.
  • 15.
  • 16.
  • 17.
  • 18.