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# 品質管理之穩健性設計 應用田口方法 - PowerPoint PPT Presentation

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98.11.10

Run Chart

etc.

### QC 工具可以用來發現產品缺點

Causes Can be:

Operator, Material, CNC programming,

Measurement,

…….etc.

### 在產品或製程設計階段強調品質問題

Leads to a more robust and reliable product because quality is designed into the product instead of adding it in at a later stage.

### 實驗設計 小結

• 全因子設計之成本過高，並非是一經濟的 好方法。(45=1280 runs)

### Plastics Injection Modeling Using Taguchi Method 塑膠射出成型應用田口方法

Dr. James M. Cupello , President of Quality Engineering Associates, San Antonio, Texas, (1999) indicated that

### 模組1 了解到

• 輸入、可控、不可控等因子將會影響一個系統的功能表現。
• 系統功能的量測包括目標值與變異數。
• 系統可以正常工作，但它可以更好。

(To design processes or products so that they are robust to noise factors.)

(可控因子)

Feed rate,

speed,

depth of cut

Ex. Length.

(without affected by noise factors)

1. 選擇品質特性

2.選擇可控與不可控因子

3.選擇直交表

4. 執行實驗

5. 分析結果與最佳參數組合

(A) 衝模間隙

(B) 衝程距離

(C) 衝擊力量

(D) 材料厚度

(E) 材料硬度

### 田口直交表

L9(34)

L9(34)

E1 E2

y1 y2 y3 y4

A B C D

1 7.5 0.5 100 1/16

2 7.5 1.0 300 2/16

3 7.5 1.5 500 3/16

4 15 0.5 300 3/16

5 15 1.0 500 1/16

6 15 1.5 100 2/16

7 22 0.5 500 2/16

8 22 1.0 100 3/16

9 22 1.5 300 1/16

Response Raw Data

2.0035 in

E1 E2

A B C D y1 y2 y3 y4

1 7.5 0.5 100 1/16 35 38 30 37

2 7.5 1.0 300 2/16 56 57 60 55

3 7.5 1.5 500 3/16 64 66 63 68

4 15 0.5 300 3/16 78 79 84 83

5 15 1.0 500 1/16 58 63 66 72

6 15 1.5 100 2/16 67 75 69 73

7 22 0.5 500 2/16 83 95 87 90

8 22 1.0 100 3/16 98 105 92 107

9 22 1.5 300 1/16 113 120 116 108

y1 y2 y3 y4 AverageS/N Ratio

1 35 38 30 37 35 19.85

2 56 57 60 55 55 28.43

3 64 66 63 68 65 29.37

4 78 79 84 83 81 28.79

5 58 63 66 72 64 20.88

6 67 75 69 73 71 25.78

7 83 95 87 90 88.78 24.88

8 98 105 92 107 100.5 23.32

9 113 120 116 108 114.3 27.08

(A) 衝模間隙

(B) 衝程距離

(C) 衝擊力量

(D) 材料厚度

(E) 材料硬度

A1:衝模間隙 7.5 μin.

B3:衝程距離 1.5 in.

C2:衝擊力量300 lbs.

D3:材料厚度 3/16 in.

### 決定材料硬度之差

Hole Plate (from sheet steel)

USL

LSL

Nominal

X 是硬度特性, 而是對孔板長度影響之效應，當 x 變化一單位時.