The Methods Used for Die Certification and Die Repeatability Evaluation 1999-01-3217
An assessment of stamped part quality and launch readiness occurs at many intervals. This paper will focus on dimensional control activities that take place after Stamping Dies are constructed, but prior to producing the stamped parts. Die certification and die repeatability measurements have been performed at DaimlerChrysler and the results are documented.
This die certification process provides an opportunity to uncover and resolve die machining issues with respect to the part math model or pre-engineered compensation model prior to producing parts.
Additionally, the die repeatability process is performed to determine the ability of the die gaging to locate the incoming in-process material consistently.
This paper will explain the die certification and die repeatability processes and share what we have learned. It will describe the processes, the tools, the participants, the sites, the benefits, and the measurement equipment. More significantly, it will explain the reasons behind these processes, issues uncovered, corrective actions being implemented, and challenges that exist for future programs.
The conclusions drawn highlight issues within the standards and requirements prescribed for die suppliers with respect to die certification, die repeatability and process capability.
The recommendations suggest that standards be updated by the auto makers and measurable results required from responsible tooling suppliers