Substitutive models of press deflections for efficient numerical die cambering

Abstract

Cost and time for stamping die tryouts are significant within the car industry. A major contributing factor is that elastic deflections of stamping dies and presses are usually not considered during the virtual die design and forming simulation phase. Active surfaces of stamping dies are only cambered based on previous experiences of tool types and stamping presses. However, almost all stamping dies and presses are unique, and available experiences are not valid for new sheet materials. This leads to component deviations and often several loops of tool adjustments are needed. Previously partners within the SMART Advanced Manufacturing research project CAMBER have developed advanced deflection measuring devices to quantify the elastic deformations of stamping presses. Using these measurements, cambering methodologies can be utilized in sheet metal forming simulations. In this paper numerical substitutive stamping press models are described which are capable of compensating for measured stamping press dynamics. The result show that a numerical compensated tool can improve the contact by over 80% compared to the corresponding contact without compensation.

New Method for Precise Measurement of Clamping Plate Deformations on Forming Presses

“…Another optical measurement method is based on optical fiber sensors integrated into specially designed measurement beams [9,33]-see Figure 2j. The beams are securely connected to the clamping plate through specially designed clamping elements, allowing them to follow its deformation under load.…”