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| 1 | Forgeability of AZ31B magnesium alloy in warm forging显示文摘To understand the forming behaviour of magnesium alloys, the upsetting test of Mg alloys at evaluated temperature was conducted. It is found that Mg alloys are brittle at temperatures below 200 ℃. When temperature is higher than 400 ℃, Mg alloy is not suitable for forging because of heavy oxidation. Mg alloy shows an excellent workability at temperatures from 250 to 400 ℃. Because in warm forging the flow stress decreases with increasing strain, which is so called work softening, no appropriate material formulation is available for Mg alloys. For the evaluation of flow stress of Mg alloys in warm forging processes, a formula is derived by analyzing the stress data measured at various temperatures in upsetting test. It is demonstrated that the formula fits the flow stress obtained from experiment. | 张先宏 阮雪榆 K.Osakada | 2003 | 中国有色金属学会会刊:英文版2003，13，3： | 8 |
| 2 | RESEARCH ON THE WARM FORGING OF ALUMINUM ALLOYS: DEVELOPMENT OF A FORMULA TO DESCRIBE THE SOFTENING BEHAVIOR OF A2011 IN FORGING PROCESS显示文摘To understand the forming behaviour of aluminum alloys, the upsetting test of alu-minum alloys at evaluated temperature is conducted. Because in warm forging theflow stress decreases with increasing straining, which is so-called work softening, noappropriate material formulation is available. For the evaluation of flow stress ofaluminum alloys in warm forging processes, in this paper, a formula is derived byanalyzing the stress data measured at various temperatures. It is demonstrated thatthe formula fits the flow stress obtained from experiment. | X.H.Zhang K.Osakada X.Y.Ruan | 2003 | Acta Metallurgica Sinica(English Letters)2003，16，2： | 1 |
| 3 | 镁合金高温精密锻造的成形极限显示文摘在高温下,用镦粗实验来研究镁合金(ZK60)的可成形性,并用精密反挤压实验来验证实验结果。在镦粗实验中,圆柱形棒料在100--400℃的温度范围内,用带同心槽的工具挤压以获得即将被挤裂的临界压下量并得到各种参数曲线。在反挤压实验中,挤压筒加热到和坯料同样的温度,在lOO--300℃的温度范围内,不用润滑剂直接将试件用机械压力压成杯形件。有限元模拟利用两个破裂准则计算出成形极限。实验中发现当温度低于200℃时试件很脆。在200℃时发现一种现象:在镦粗实验中样品发生很小的应变就破裂了,而在反挤压实验中,当挤压比大于3.7时,可以得到无裂纹的杯形件。在250--400℃之间镁合金表现出良好的可成形性。当温度高于400℃时,镁合金发生严重的氧化而不适合成形。在100--200℃之间,破裂准则用最大拉伸应力来表示,它可以有效地预测镁合金的成形极限。 | N.Ogawa M.Shiomi K.Osakada 张宾 张坤 | 2003 | 国外金属加工2003，24，3： | 1 |
| 4 | 非圆形钢管无模弯制的开发显示文摘一种新的无模弯管方法得到了开发。在这种方法中,钢管的一头夹紧于旋转臂,钢管用感应加热圈局部加热至高温。通过钢管另一头加推力使钢管以恒定的速度沿轴向移动使钢管连续不断地受到弯曲。钢管材料为普遍碳钢,其横截面形状分别为圆形、椭圆、方形、六角形及十字形。试验结果表明,在小弯曲半径内。非圆形钢管可以容易地弯制成半圆形弧,而不产生折皱、裂痕之类的缺陷。 | K.Kobatake H.Sekiguchi T.Ichise K.Osakada 夏福清 | 1989 | 电力建设1989，10，12： | 0 |
| 5 | 日本精密锻造的研究与开发显示文摘自从大约70%的锻造产品应用于日本汽车工业开始,日本轿车国内生产的历史发展趋势可以使用图1来解释。大约在1960年,汽车制造商开始生产小型客车,每年产量都急剧上升,1973年发生石油危机后,由于其节省燃料,其产量也随着出口的增加而再次上升。大约从1990年开始,由于海外制造变多,所以日本国内的生产开始减少,锻造工业也因此受挫。目前,日本汽车制造商的海外工厂生产大约占全部的一半。 | K.Osakada T.Nakamura | 2007 | 锻造与冲压2007，，4： | 0 |
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