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zoe122208木蟲 (正式寫手)
superboy
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[求助]
幫忙翻譯一段漢語，謝謝
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| B柱直壁破裂的原因是由法蘭區(qū)溫度的差異和應變路徑的改變共同造成的。當毛坯尺寸不合理時，破裂危險部位對應的法蘭處毛坯過大。在壓邊力的作用下，毛坯尺寸越大，進料阻力就會越大，同時法蘭處于正向壓力作用而快速降溫，當溫度降低到500 °C以下時，變形抗力增強，阻礙材料向中間流動，導致直壁破裂。另一方面，由于模具型面采用臺階式，成形過程中毛坯進料要滑過兩個圓角，多經過兩次彎曲反彎曲變形，導致直壁處應變路徑由拉深狀態(tài)經過平面應變狀態(tài)再到雙拉狀態(tài)，復雜的應變路徑導致破裂更加容易產生。當減小法蘭處板料時，減薄嚴重位置應變路徑為單純的拉深狀態(tài)，因此減小破裂發(fā)生的可能性。 |
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deng神之刺客
木蟲 (小有名氣)
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zoe122208: 金幣+30, 翻譯EPI+1, ★有幫助 2013-11-10 13:54:01
zoe122208: 金幣+30, 翻譯EPI+1, ★有幫助 2013-11-10 13:54:01
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The reason of B column straight-wall broken was caused by the different temperature of the flange area and the alteration of strain paths. When the size of workblank was unreasonable, workblank of the flange area at fracture risk parts would oversize. With the action of blank holder force, the size of the workblank larger, the resistance of feedstock would be greater. In the meantime, flange cooled down rapidly because it was in the positive pressure. When the temperature was below 500°C, resistance of deformation would be enhanced, hinder material flow in the middle, led to the straight wall rupture. On the other hand, because the mo(u)lding surface of mould was stepped, feedstock of workblank would glide two rounded corners during the forming process. Two more bending deflection and reverse bending deformation would happen, resulting in strain paths of straight-wall at first was deep drawing state, then plane strain state, at last in the double pull state. Complicated strain paths lead to burst occur more easily. Once sheet of the flange area was reduced, strain paths of thinning serious position was simple deep drawing state, so it could decrease the possibility of rupture. 僅供參考 |
2樓2013-11-08 20:12:23
befair
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zoe122208: 金幣+70, ★★★★★最佳答案 2013-11-10 13:54:08
zoe122208: 金幣+70, ★★★★★最佳答案 2013-11-10 13:54:08
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The reason why the vertical wall of B column fractures is due to the joint effect of temperature variation in flange area and the change of strain pathway. When dimensions of the raw work pieces are not adequate, the excessive size at the flange corresponds to the potentially fracture prone area. By the effect of side force, the greater the dimension of the work piece, the more resistance it is when being fed into the die. At the same time, the flange area quickly cools down due to normal pressure and when the temperature is below 500°C, deformation resistance increases, which prevents the material from flowing into the centre, hence causing fracture. On the other hand, the work piece, while being fed during forming process, must slide pass two rounded corners, as the die parting surface is stepwise. Because of deformations after multiple bendings forth and back, strain pathway at the vertical wall shifts from pure stretching, via plane strain， to double stretching and this complicated strain pathway makes fracture much more likely to occur. When reducing the dimension at flange, the strain pathway at most reduced location is pure stretching only and hence the likelihood of fracture is reduced. 供參考 |
3樓2013-11-08 20:37:46
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