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Producing high-quality car body parts with complex geometries and tight manufacturing tolerances requires advanced sheet-metal-forming strategies, enabled by servo pressServo press technology. In modern press shops, freely programmable ram movementRam movement profiles of servo pressesServo press are currently used to shorten cycle times. However, scientific studies showed that maximum drawing depth of certain part geometries can be produced by adapted ram movementRam movement. Therefore, this article presents a method for optimizing the ram movementRam movement, taking into account velocity-dependent friction coefficientsFriction coefficient acting in the drawing die. To prevent failure due to cracking or wrinkling, stepwise numerically optimized ram speeds are determined for a sheet metal part using finite element simulationsFinite element simulation, considering dynamic friction coefficientFriction coefficient tables and a constant blank holder force. The optimization method is then applied to parts made of DP500 and EN AW-6014. The results show significantly improved part quality by the optimized ram movementRam movement profiles compared to conventional sinusoidal profiles.

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A Method for Optimising Ram Movement During Deep Drawing Aiming to Improve Part Quality by Ideal Friction Conditions

  • 会议论文

  • 发表日期：

    2026年

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  • Lukas Hauser,
  • Kim Rouven Riedmüller,
  • Mathias Liewald

摘要

Producing high-quality car body parts with complex geometries and tight manufacturing tolerances requires advanced sheet-metal-forming strategies, enabled by servo pressServo press technology. In modern press shops, freely programmable ram movementRam movement profiles of servo pressesServo press are currently used to shorten cycle times. However, scientific studies showed that maximum drawing depth of certain part geometries can be produced by adapted ram movementRam movement. Therefore, this article presents a method for optimizing the ram movementRam movement, taking into account velocity-dependent friction coefficientsFriction coefficient acting in the drawing die. To prevent failure due to cracking or wrinkling, stepwise numerically optimized ram speeds are determined for a sheet metal part using finite element simulationsFinite element simulation, considering dynamic friction coefficientFriction coefficient tables and a constant blank holder force. The optimization method is then applied to parts made of DP500 and EN AW-6014. The results show significantly improved part quality by the optimized ram movementRam movement profiles compared to conventional sinusoidal profiles.