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由于钛的优越性能,使它成为心脏起搏器的良好材料。目前国际上生产的第三代和第四代心脏起搏器均为钛制的外壳。钛板的成形性较差。钛的深拉深一般都要在加热情况下进行。如图1所示的钛壳,尺寸小,但零件的深度大,因而拉深的变形程度大,象这样尺寸的零件,即使成形性最优良的材料也不能一次拉深即成,更何况是钛板。根据拉深理论分析,采用差温拉深法有可能用一次拉深即达到成形目的。其结果可达到缩短工艺流程,减少模具套数的目的。所谓差温拉深就是在拉深过程中在毛料的凸缘上加热,使主要变形区(即凸缘)的材料变形抵抗力显著地降低。另外,在易被拉裂的筒壁部位给以有效地冷却,借以强化筒壁的强度。试验结果,证明一
Due to the superior properties of titanium, making it a good material for pacemakers. At present, the third and fourth generation cardiac pacemakers produced in the world are made of titanium. The poor formability of titanium plate. Titanium deep drawing generally should be carried out under heating. The titanium case shown in Fig. 1 has a small size but a large depth of the part, so that the degree of deep-drawing deformation is large. Parts of such a size can not be drawn even at the most formative material, let alone Titanium plate. According to drawing theory analysis, the use of poor temperature drawing method may be used to achieve a deep drawing forming purposes. The result can be achieved shorten the process, reducing the number of die sets. The so-called differential temperature drawing is heated in the process of drawing the flange in the wool, the deformation of the main deformation zone (ie, flange) material deformation resistance significantly reduced. In addition, in the easy-to-be-cracked wall portion to effectively cool, in order to strengthen the strength of the cylinder wall. Test results to prove one