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งานนำเสนอกำลังจะดาวน์โหลด โปรดรอ

1 ANSI/ASQ Z1.4 Acceptance Sampling Plans  Devised in 1942 at Bell Labs  Later became MIL-STD-105E  ISO-2859  ANSI/ASQ Z1.4 (The American National.

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งานนำเสนอเรื่อง: "1 ANSI/ASQ Z1.4 Acceptance Sampling Plans  Devised in 1942 at Bell Labs  Later became MIL-STD-105E  ISO-2859  ANSI/ASQ Z1.4 (The American National."— ใบสำเนางานนำเสนอ:

1 1 ANSI/ASQ Z1.4 Acceptance Sampling Plans  Devised in 1942 at Bell Labs  Later became MIL-STD-105E  ISO-2859  ANSI/ASQ Z1.4 (The American National Standard Institute and American Society for Quality Control Z1.4)  Wording & terminology changes  Additional tables added

2 ANSI/ASQ Z1.4  Intended to be used for a continuing series of lots, but may be designed for isolated lots.  Standard provides for single, double, and multiple sampling plans.  ANSI/ASQ Z1.4 is also provided for normal, tightened, or reduced inspection.  Plan is specified by the AQL, and sample-size code. 2

3 ANSI/ASQ Z1.4  Normal inspection is used at the start of inspection with changes being a function of recent quality history. ( แผนนี้ใช้ เมื่อเริ่มทำการสุ่มตรวจล็อต และสามารถเปลี่ยนการตรวจเป็น แบบแผนผ่อนปรน (Reduced inspection) หรือเข้มงวด (Tightened inspection) ซึ่งขึ้นอยู่ประวัติของคุณภาพของ สินค้าที่ทำการตรวจ )  Tightened inspection:  Generally used when producer’s recent quality history has deteriorated. ( ใช้เมื่อประวัติของคุณภาพของสินค้าแย่ มาก )  Reduced inspection:  Used when the producer’s recent quality history has been exceptionally good. 3

4 ANSI/ASQ Z1.4 4

5 Sample Size Code Letters Most commonly used 5

6 Comparison of Inspection levels 6

7 Example For a lot size of 2000, an AQL of 0.65%, and an inspection level of III, determine the single sampling plans for normal, tightened, and reduced inspection. 7

8  Normal, Tightened, and Reduced Inspection  Start with normal inspection  Switching Procedures  Normal to tightened  Institute when 2 out of 5 consecutive lots not accepted on original inspection  Tightened to normal  Institute when 5 consecutive lots accepted  If not, then discontinue inspection under this plan ANSI/ASQ Z

9  Switching Procedures  Normal to reduced  Institute when: (all of the following)  Preceding 10 lots on normal inspection have been accepted  Total nonconforming in preceding 10 samples is less than number identified in Table  Production is at a steady rate  Reduced inspection is considered desirable by responsible authority ANSI/ASQ Z

10  Switching Procedures  Reduced to normal  Institute when: (any of the following)  A lot is not accepted  Sampling procedure terminates with neither acceptance or rejection criteria have been met  Production is irregular or delayed  Other conditions ANSI/ASQ Z


ดาวน์โหลด ppt 1 ANSI/ASQ Z1.4 Acceptance Sampling Plans  Devised in 1942 at Bell Labs  Later became MIL-STD-105E  ISO-2859  ANSI/ASQ Z1.4 (The American National.

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