1. Taguchi Method Applied to a Heat Treatment Process for Steel Sean Gant Jay Lee

2. Level 1Level 2 Temperature760900 oCoC Quenching Rate35140 o C/s Cooling Time1300s Carbon Content16wt% C CO 2 Concentration520% EXAMPLE Heat treatment process used to harden steel components

3. OBJECTIVE Determine which process parameters have the greatest impact on the hardness of the steel components

4. ARRAY SELECTION 5 process parameters + 2 Levels = L8 Array ExperimentP1P2P3P4P5P6P7 11111111 21112222 31221122 41222211 52121212 62122121 72211221 82212112

5. Experiment Carbon Content (wt% C) Quenching Rate ( o C/s) Cooling Time (s) CO 2 Concentration (mol %) Temperature ( o C) 113515760 2135120900 311403005760 4114030020900 56353005900 663530020760 7614015900 86140120760

6. RUNNING EXPERIMENTS Run 4 trials for each experiment ExperimentT1T2T3T4 1 68.0061.4166.3397.07 2 69.8464.7686.0751.67 3 74.3661.3094.5796.81 4 71.7158.4277.2360.05 5 91.2790.8984.5463.72 6 54.3973.0150.1079.62 7 64.6591.5172.6884.33 8 60.3160.6976.7374.97

7. Taguchi EquationsSample Calculations for first experiment

8. ExperimentP1P2P3P4P5SN 11111113.07 21112213.55 31221113.61 41222217.29 52121216.06 62122113.02 72211216.30 82212117.67

9. Table of the average SN value for each factor Δ = Max – Min The Parameter with the highest value of delta is the most important parameter to investigate (P2 – Quenching Rate) LevelP1P2P3P4P5 1 14.3813.9315.1514.7614.34 2 15.7616.2215.0015.3915.80 Δ 1.382.290.150.631.46