Grain Size Effect on the Springback Behavior of the Microtube in the Press Bending Process

作者：Jiang Cho Pei^*; Chen Chang Cheng

来源：Materials and Manufacturing Processes, 2012, 27(5): 512-518.

DOI：10.1080/10426914.2011.593230

• Bending
• Press
• Springback
• Tube

One of the most troublesome problems facing the tubing production industry is springback in the press bending process. With the ongoing miniaturization of products, springback is a dominant effect because material behavior greatly varies in the microtube press bending process. The present investigation numerically and experimentally addresses the effect of grain size on the press bending process of seamless stainless microtubes. The problem was approached in three stages. First, the microtubes were annealed to examine the grain size effect on mechanical properties by performing a tensile test. Second, a microtube press bending system was developed to observe springback behavior. Third, the press bending process was simulated by a conventional finite element model to predict the springback amount and make comparisons with the experimental result. Consequently, the experimental springback result was higher than that of the prediction made by the simulation. The occurrence of grain subdivision, induced by strain hardening, reduced the springback amount. The criterion of grain subdivision occurrence may be determined by observing the reaction force with respect to the stroke of the press and bending angle.

• 出版日期2012