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Simulation of the drying process of a body in white

Thermo-Mechanical Analysis using CADFEM ANSYS Extensions

Simulation of the drying process of a body in white

Task

In a car body painting process the body in white with the applied e-coat moves through an oven to dry the paint layer. Besides of drying the paint the oven is also used for:
  • hardening of aluminum alloys,
  • curing of adhesives,
  • foam expansion.
High quality standards apply to the drying process of car body paints. These standards guarantee that all parts of the body in white reach a certain temperature over a specified time period and assure high quality paints. On the other hand the paint is damaged if the temperature is too high, and high temperature gradients lead to mechanical deformations. Additionally, time for the whole process is limited. Especially if aluminum and steel mixtures are used, thermal stresses, which could exceed stress limits of the material and cause permanent deformations, should be evaluated.

Solution

While planning a new drying oven for the new Porsche 911 and Boxster in Stuttgart-Zuffenhausen, Porsche used VPS/DRY already within the design phase of the new oven to simulate the paint drying process. VPS/DRY analyzes the temperature distribution, the temperature dwell time and thermal deformations of the car body.
By analyzing different variations, the influence of modifications was evaluated and the design of the oven optimized.

Customer Benefits

With simulations of the oven behavior in the design phase, an optimized oven design was found which fulfills the required criteria of the drying process.
Virtual technology helped to avoid expensive changes after the oven is built, and to gain more insight into the manufacturing process.

CADFEM_Anwendungsfall_Porsche_simulation_of-englisch-2014-05-14.pdf

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