D. N. He
,
X. F. Yin
,
H. Z. Thao
,
D. L*
,
X. Y. Ruan
,
J. L. Cheng and J. Y. Jiang 1) Shanghai Jiao Tong University
,
National Die & Mold CAD E. R. C
,
Shanghai 200030
,
China 2) Shanghai Vopkswagen Automotive Company Ltd.
,
Shanghai 201805
,
China Manuscript received
金属学报(英文版)
The deformation characteristic of bland in deep drawing is discussed. It is pointed out that the friction and lubrication conditions in for drawing are different from that in mechanical motion or machine work or other plastic process. The common test methods in laboratories are analyzed. It shows that though all those test methods can test the friction coefficient, the probe test method is most suitable for the research of friction and lubrication and the process in deep drawing, for this method is identical with the actual work condition either from the test principle or deformation status of the blank. Last the successful application in the deep drawing simulator newly developed the the probe method are intro- duced in detail.
关键词:
deep drawing
,
null
,
null
,
null
Y.J. Luo
,
S.P. Li
,
J.F. Zheng
金属学报(英文版)
In sheet metal forming, drawbeads are often used to control uneven material flow which may cause defects such as wrinkles, fracture, surface distortion and springback.Appropriate setting and adjusting the drawbead force is one of the most important parameters in sheet metal forming process control. This paper derives the model of loop drawbead restraining force (DBRF) using plastic forming theory, and gives the minimum blankholding force. Experiments are carried out to verify the proposed DBRF model. The good agreement between the calculated values and experiments data justifies the proposed loop drawbead restraining force model.
关键词:
drawbead
,
null
,
null
,
null
程永奇
,
陈振华
,
夏伟军
材料热处理学报
为了探索提高AZ31镁合金板材室温冲压性能的途径,通过断口形貌分析,对板材室温拉深变形过程中的破裂机理进行了研究.结果表明,室温下,对于普通轧制板材,在拉深比达到1.2后即在冲头肩部发生破裂;对于等径角轧制板材.其拉深比可达1.6以上;当拉深比达到1.8时,在杯形件凸缘发生破裂,断面光滑平整.为解理断裂.这主要与板材在拉深变形中的应力应变状态和其非基面织构有关.单向拉伸与断口分析表明其冲压性能和破裂行为的差异,主要是因为这两种板材织构不同所致.
关键词:
AZ31镁合金板材
,
拉深
,
断裂机理
,
普通轧制
,
等径角轧制
刘奎武
,
边巍
机械工程材料
doi:10.11973/jxgccl201512022
以某卡车用 AA5754铝镁合金油箱盖板为研究对象,利用 DYNAFORM 有限元软件对其拉深成形过程进行有限元模拟,研究了板料厚度、模具间隙及压边力对最大减薄率的影响,并进行了试验验证.结果表明:油箱盖板最大减薄率随着板料厚度及压边力的增大而增加,随着模具间隙的增大而减小;最大减薄率及最大增厚率的模拟值与试验值的相对误差分别为7.85%与9.48%,验证了有限元模拟的准确性;通过有限元模拟,将板料的厚度从3 mm 降至2.5 mm.
关键词:
油箱盖板
,
拉深成形
,
有限元模拟
,
板料厚度
,
最大减薄率
罗志俊
,
王丽萍
,
孙齐松
,
李舒笳
,
马跃
,
王晓晨
材料热处理学报
采用热力学软件Thermo-Calc计算、热模拟及TEM观察的试验方法,分析了低碳钢AlN析出行为以及其对热轧材、拉拔材加工硬化的影响.实验结果表明,未进行工艺调整的试验钢其深拉拔过程中强度增量△Rm与减面率γ的关系式为△Rm=33.0+6.02γ,缓冷工艺时对应的关系式为△Rm1=24.1 +5.03γ,缓冷钢的加工硬化明显低于原工艺;低温铁素体区AlN的析出是热轧材屈服强度和深拉拔加工硬化率降低的原因.通过控制低温区固溶N的析出,屈服强度由原来的340 MPa降为300 MPa,屈强比由原来的0.655降为0.610.在此成分体系下,AlN在奥氏体区析出温度范围为900 ~1000℃,950℃为鼻子温度;在铁素体区主要析出温度范围为650 ~750℃,700℃析出最多,上述实验结果为现场斯太尔摩线冷却工艺控制提供技术依据.
关键词:
低碳钢
,
深拉拔
,
AlN析出
,
加工硬化
邢秋丽
,
彭湃
,
张嫦娟
,
王瑞琴
,
李辉
,
唐进
钛工业进展
钛及钛合金相对铝、钢等金属材料塑性差、极限变形量小、成形时回弹大,拉深成形相对困难.介绍了钛及钛合金拉深成形的影响因素及其对成形的影响,综述了钛及钛合金拉深成形在各向异性控制、压边力控制、计算机模拟以及加热方法等方面的技术进步,指出了未来研究人员应充分利用计算机模拟技术,对影响钛及钛合金冲压成形的各种因素及其之间的相互关联建立详尽的数据库,以便该成形工艺在钛及钛合金零部件的成形得到更广泛的应用.
关键词:
钛及钛合金
,
拉深成形
,
影响因素