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板料数控渐进成形中不同成形角位置的厚度不同,简单利用零件曲面或者等距偏置无法保证得到工具头与支撑体的合理间隙。利用渐进成形厚度减薄余弦定理δ=δ0cosθ,将加工件的表面离散为STL模型,提取STL各三角面片顶点坐标,x、y坐标保持不变,z坐标在Z轴负向偏置一个原始板材厚度,偏置后保持三角片拓扑关系不变,在此基础上生成支撑体表面模型。该方法依据零件模型不同成形角部位的厚度变化规律,可以得到合理的加工间隙。选择球冠型零件进行实验,获得了较好的加工件表面质量,对成形零件变形区厚度进行了测量,并对所得数据进行分析。
Sheet metal incremental forming different forming angle position of different thickness, simply using the part surface or isometric offset can not be guaranteed to get a reasonable tool head clearance and support. The asymptotic cosine law δ = δ0cosθ is used to discretize the surface of the workpiece as the STL model. The vertex coordinates of each triangular patch in STL are extracted and the x and y coordinates remain unchanged. The z coordinate is negatively biased by a primitive After the thickness of the plate is kept, the topological relationship of the triangular plate is kept unchanged after offsetting, and on this basis, the support surface model is generated. According to the thickness variation of different forming corner parts of the model, this method can get a reasonable machining gap. Select the ball-type parts for experiments, get a better surface quality of the workpiece, the deformed part of the thickness of the molded parts were measured, and the resulting data were analyzed.