Language of Automotive Body Stamping Dies Defining and Documenting Compensation within a Stamping Die

Traditional methods for buying off parts do not acknowledge the state of the dies, that is the way the die was cut relative to the product model. Many different methods for achieving a correct part are included in the die making process. Communication of the reasons for these actions and the exact amount of deviation from the product model has been lacking. Hampering communication further has been the lack of a global language or understanding of terms from one group to the next. Furthermore, continuous improvement has been difficult due to a lack of documentation of the plan and its correlation to the results. This paper is an attempt to define the different types of compensation and describe where in the die process this compensation exists. Some of the die compensation types we will be addressing include:

• Static Load Compensation
• Creepage
• Overbend
• Springback
• Plussing
• Overcrown
• Undercrown
• Elastic Recovery (Young's Modulus)

We will also create a framework to document the exact amount of deviation (die compensation) from product model for each die in the die lineup and measured deviation of the actual die relative to the analysis model (die compensation model). Finally, we will touch on the die design standards (tooling balls) and machining practices necessary for optimal machining and used for measurement.