クロス強化熱可塑性プラスチック板のプレス成形に関する研究

概要

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This paper describes experimental press forming of glass-cloth reinforced thermo-plastic composite sheet. The sheet was formed with a set of deep drawing tools, i.e., punch, die and blank holder. Deformation of the sheet during the forming was measured by mean of the scribed grid method. Two types of punches - flat and hemispherical - were used to form the sheet. The main deformation occures in the part of the sheet having a 45° with the fiber, while the rest of the sheet deforms only slightly. The formability of the sheet is limited by the wrinkling that occurred at right angle to the fiber direction. The amount of wrinkling was measured as being the compressive strain in the fiber direction. A newly designed blank holder that has two concentric circular edges on it improves the formability of the sheet. By giving a more radial tensile force on the sheet at 45°, this holder increases both the magnitude and area of the shear-deformed part of the sheet and reduces the compressive strain in the fiber direction, thus reducing the amount of wrinkling. Deeper cups can be produced by this new blank holder.
社団法人日本材料学会の論文
1994-04-15