00193407-02 HWWS SIPLACE Machine Accuracy EN.pdf - 第21页

© Siemens AG . . Änderungen vorbehalten SIPLACE Placement Systems Exercise 1: Calculate the Cm and Cmk value fo r a placement machine within a specification of 90 um at 4 Sigma with following indices: standard distributi…

SIPLACE

Placement Systems

Definition:

to achieve a constant, clearly defined attribute, within specified parameters (tolerance limits).

declaration of a capability value without a declaration of tolerance or specification limit is worthless !!!

… characteristic must be measure able and must be normal distributed

Cpk = Min (Cpk 1, Cpk 2),

means, the lowest value is only used for the Cpk

USL - LSL

6 x sigma

Cp =

3 x sigma

USL - offset

Cpk 1 =

3 x sigma

LSL - offset

Cpk 2 =

Process Capability

SIPLACE

Placement Systems

Exercise 1:

Calculate the Cm and Cmk value for a placement machine within a specification of 90 um at 4

Sigma with following indices:

standard distribution -18.5 um Cm value: ............................

offset - 21.0 um Cmk value: ...........................

Evaluate the result

Is the machine ... capable { not capable |

Exercise 2:

Calculate the Cm and Cmk value for the same placement machine within a specification of 135 um

at 6 sigma with following indices:

standard distribution -18.5 um Cm value: .............................

offset - 21.0 um Cmk value: .............................

Evaluate the result:

Is the machine ... capable { not capable |

Exercise 3:

Evaluate the results and compare it with the required specification

Exercise Maschine Capability

SIPLACE

Placement Systems

NOTES