Processing Machinery
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PEI Process Window Fixation
Fenómeno del problema
After the debugged mature PEI process is changed arbitrarily, quality fluctuates; process discipline is not strictly enforced.
Análisis de la causa
The PEI process window is narrow and multi-parameter coupled; mature processes with high debugging costs are valuable; arbitrary changes destroy stability; change management is missing.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
①Controlled document management of process parameters; ②changes require verification and approval; ③identification of key parameters; ④regular process audits.; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusión clave
PEI process stability relies on discipline; change management is a system requirement; audits ensure execution.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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