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在大型覆盖件上检测其冲孔数目是一项非常重要的工作,这里我们介绍了用CCD传感器完成该项工作的途径。 相似文献
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翻边是冲压工艺中常用的一种成形手段,翻边起皱是冲压生产中常见的缺陷。目前通过CAE模拟分析方法判断起皱缺陷,存在分析时间长,效率低,针对该问题,对影响翻边起皱的关键因素建立简单有效的数学模型,通过计算圆弧弧长和线长变化率,同时结合模型和多款在产车型实际状态对比,快速判断零件翻边起皱状态,提高项目决策效率,降低成形风险。通过该方法进行判断,并对比实车状态,该理论与实际相符合。 相似文献
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Y/Bi co-doped silicate glasses were prepared,and the effects of Y 2 O 3 on the absorption and emission properties were investigated by spectrum measurement.It was found that the absorption intensity in visible region decreases with increase of Y 3+ concentration in(70-x)SiO 2 xY 2 O 3-30CaO-1.5Bi 2 O 3(x=0 mol.%,1 mol.%,3 mol.%,5 mol.%,7 mol.%) glasses.The emissions centered at 410,630,1200 and 1290 nm were observed under 280,470,514 and 808 nm excitation,respectively.The emission intensity had the similar change tendency in the visible and near infrared region.We also discussed the actual role of Y 3+ ions playing in the visible and near infrared emissions of the silicate glasses. 相似文献