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Study of Thickness Optimization and Springback of Continuous Variational Section Automotive Crossbeam

Author: WangHongWei
Tutor: YuanGuoDing；JiangYinFang
School: Jiangsu University
Course: Mechanical Manufacturing and Automation
Keywords: Continuous variable cross-section board ( TRB ) Lightweight Car beams Thickness Optimization Blank holder force Rebound control
CLC: TG386.41
Type: Master's thesis
Year: 2008
Downloads: 55
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Abstract

The lightweight body has gradually become one of the development trend of the automotive industry to become a key research topic in the future development of automobile industry. Continuous variable cross-section plate thickness distribution with the load distribution characteristics of continuous change, with the thickness of the plate and an unparalleled advantage Tailored Blanks is one important way of lightweight vehicles. Continuous variable cross-section board has a great advantage, but there are some problems need to be addressed in the actual production. First, how to calculate the thickness of parts subject to load distribution, ie a continuous variable thickness of the section board parts optimization problem. Secondly, the continuous variable cross-section board, will follow the assembly brought a lot of problems throughout the thickness, the entire amount of springback stamping are quite different; how to reduce the rebound and how to make the entire The springback equilibrium continuous variable cross-section board rebound control issues. First U-shaped piece bending the blank holder force under the stress strain characteristics of the U-shaped pieces after unloading the rebound principle, combined with variable cross-section plate, blank holder force of the main factors affecting the rebound from the theoretical analysis were analyzed. Auto body force and force complex beam parts, especially suitable for continuous variable cross-section board to make, you can greatly reduce the weight of the parts, and saving material and manufacturing costs. Currently in the research and production to the typical car front seats beams for the study, the use of large general-purpose finite element software ANSYS and its parameters to optimize the design language APDL beams of variable cross-section plate finite element model established by the programmer; thickness function in accordance with its load suffered along the longitudinal direction of the thickness distribution of the optimization. The results showed that, compared with a constant thickness plate, continuously variable cross-section plate having a good effect of weight loss. By comparing the effect of weight loss and combined with actual production conditions, in order to determine the optimal thickness distribution of the car beams. Large general-purpose software ANSYS / LS-Dayna stamping continuous variable cross-section beams forming the rebound after its uninstall the numerical simulation analysis shows that the thickness of the plate and continuously variable cross-section plate forming simulation, such as thick plate stamping and thinning are more evenly distributed, and variable cross-section plate due to the presence of thickness, thin at the thickest thinning rate, the middle of the transition zone thinning rate is smaller. For variable cross-section plate, variable cross-section plate rebound between thin and thick sheets springback deformation thick at the thin material at the mutual restraint. Blank holder force control technology, research and a piece of blank holder force and position block blank holder force under the control of the rebound effect; compared with the single piece of blank holder block blank holder, you can make The springback beams tends to balance, while the overall amount of springback decline. According to the law of continuous variable cross-section beams forming and springback, the block blank holder on the basis, with the itinerary and location of BHF control method, in forming the previous stage with a small pressure side force, forming a later stage with large blank holder force, can greatly reduce the amount of springback overall, and the entire amount of springback difference smaller, to achieve good control of the rebound effect. In addition, comparative analysis, much too small for the latter stages of the blank holder force on rebound control are detrimental to the beams under moderate pressure and force, springback to a minimum.

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