umerical Study on Welding Line Behavior of Deep Drawing TWB Process

 The FEM technology is used to analyze the welding line movement behavior of deep drawing TWB sheet with different thickness. It is found that high stress fields are concentrated around the welding line and large residual stresses are left. The effect of the welding line movement is like a rigid string and the selected nodes of the thin part near the welding line show the related larger strain.     

Hydromechanical Deep Drawing of Tailor Welded Blanks

This paper investigates the conventional and hydromechanical deep drawing of circular tailor welded blanks (TWBs) with a linear weld line. TWBs offer the possibility to combine different materials, different thicknesses and different coatings within one part, as to optimally fit the applied loads with the lowest possible weight. By combining the hydromechanical deep drawing process with TWBs, a new range of applications can be offered. For the investigations experimental trials are carried out, as well as finite‐element simulations. The material parameters of the parent materials and of the weld line are determined and included in the modelling of the TWB. A tool die is designed allowing the hydromechanical deep drawing of TWBs while taking into account the sealing of the TWB and the gap in thickness created by blanks of different thickness. In this way a different blank holder pressure can be applied on each side of the TWB, using a segmented blank holder and a multi‐point cushion system. The goal of this study is to investigate the influence of the counter pressure on the deep drawing process of TWBs with particular interest given to the weld line movement during the forming process. It is found that the deep drawing process can be simulated accurately by the finite‐element analysis and that the weld line movement plays a crucial role in the deep drawing of a sound part.     

Zn-Cu合金深冲性能与工艺参数间的函数关系

采用回归分析方法研究了Zn-Cu合金深冲性能与工艺参数间的函数关系。     

冷轧DC04平整工艺试验研究

文章介绍了通过采用77％。82％的冷轧变形量,将原料轧制到0．7-0．8mm厚的Ti—IF钢板采用不同的轧制力进行平整的试验。结果显示相关机械性能随着平整力增加而变差,为保证带钢的性能,选择采用较小平整轧制力进行生产。     

Deep Drawing of Friction Stir Welded Thin Sheet Aluminium Steel Tailored Hybrids

Friction stir welding undergoes a steep evolution in industrial applications since the invention in the early 1990s. Especially for aluminium alloys in sheet thicknesses over 2 mm a lot of applications are established, whereas a lack in knowledge about friction stir welding of thin sheets with sheet thickness less than 2 mm exists. This article deals with friction stir welding of thin sheet aluminium steel tailored hybrids and their formability. These investigations tend to close the gap of availability of friction stir welded blanks in the range of 1 mm sheet thickness and to offer new applications of this joining technology. For production of aluminium steel tailored hybrids AA5182 with a thickness of 1.2 mm and DC04 in 1.0 mm are used, the joining partners are friction stir welded in a lap joint. Different tool geometries and process parameters are performed to achieve the highest strength and elongation at fracture of the tailored hybrids. The influence of the stirring on the arrangement and distribution of both materials in the welding zone and its microstructure is analysed using light optical and scanning electron microscopy. In addition to tensile tests planar microhardness measurements help to detect the local changes of the mechanical properties in the characteristic zones of the weld seam. Tailored hybrids, which were friction stir welded with the best welding parameters in accordance to the mechanical properties of the weld seams, were used for deep drawing tests of friction stir welded thin sheet aluminium steel tailored hybrids. The maximum drawing ratio of these tailored hybrids coincides with the one of the parent material of AA5182.     

宝新深冲产品应用分析

为开发深冲用冷轧不锈钢产品（即DDQ产品）,扩大宝钢不锈钢在冷冲压制品市场的占有率,在对奥氏体不锈钢形变理论分析及冷冲压制品市场调研的基础上,对304系列钢种中的304Ni8.5、304Ni9及SUS304Cu按不同工艺进行了试制生产,并将试制产品供不同成形方式制品加工试用。试用结果表明：宝新304Ni8.5、304Ni9及SUS304Cu深冲系列产品具有较好的流动性,较适合于热水器内胆等以拉深成形为主要成形方式的冲压加工,其中304Ni8.5及SUS304Cu的极限深冲比在2.4以上、304Ni9的极限深冲比可达2.9以上,而水槽等以胀形为主要成形方式的冲压制品,使用宝新一般冲压类产品更为适合。     

薄板压延中在压边圈叠加振动的模拟试验

应用模拟的方法在薄带摩擦试验中于正压力上叠加低频振动,模拟薄板在叠加振动的压边圈下的摩擦状态,系统地研究了振幅、频率、正压力、拉速、表面与摩擦力的关系.试验表明,在一定的条件下,低频振动叠加是可以改善薄板成形变形区的摩擦状况,降低摩擦力的.     

深冲用热镀锌板生产工艺探讨

阐述了深冲热镀锌板的发展趋势和生产工艺特点，分析了工艺制度对产品性能的影响，指出了深冲热镀锌板的生产工艺控制要点。     

辊模拉拔药芯焊丝的变形特性

利用MTS材料试验机等研究了固定模与辊模拉拔药芯焊丝的变形特点和工艺特点,给出了变形参数、力能参数、粉末流动等实验结果.结果认为,辊模拉拔具有良好的成型性和较低拉拔力的变形分配条件.     

DC04冷轧深冲钢生产试制

八钢冷轧深冲钢以生产IF钢为目标,通过研究IF钢的机理,制定了相应的工艺制度,生产出的汽车用冷轧深冲钢产品力学性能较好,用户使用后满意。     

铝合金焊丝的拉拔及刮削工艺研究

为制造高品质铝合金焊丝材料,通过分析单模拉伸条件、拉伸的影响因素、拉伸配模原则、拉伸加工率等对铝合金焊丝拉伸的影响,形成了铝合金焊丝单模拉伸工艺、热处理工艺、多模连拉工艺及机械刮削光亮化工艺.结果表明:当加工率不超过27%、退火温度为410℃±10℃/保温1.5小时,可实现铝合金焊丝单模拉伸的顺利进行;两道模具之间的加...     

铝合金激光深熔焊接热过程有限元数值模拟

对铝合金5A06简体纵缝进行激光深熔焊接。建立了该条件下的焊接热源模型,热源模型由沿激光入射方向的旋转高斯体热源构成。使用该热源模型和ANSYS有限元分析软件对前述的试验进行了数值模拟。为制定和优化焊接工艺提供必要的参考。     

冲压钢板塑性应变比r值的在线检测技术

根据冲压钢板极图的对称性可以大幅度地减少极图数据检测量,利用X射线面探测可以一次性记录到所需的关键极图数据,进而计算出正态分布的各织构组分的体积量.利用反应应力模型可以根据各织构组分体积量快速而准确地计算出钢板的r值.相关计算也可以兼顾到一些非织构因素的影响.该技术快速、准确, 可用于冲压钢板的r值在线检测.     

冷轧深冲用钢生产工艺改进

冷轧深冲用钢通过试制改进后采用无间隙原子钢材质,并对热轧工艺、冷轧工艺、退火工艺等进行调整。工艺调整后材料具有高的塑性应变比、高的应变硬化指数、低的屈服强度,使材料具有优良的成型性能,最终产品满足了用户的使用要求。     

H_1Cr_(21)Ni_(10)Mn_6焊丝在冷拉过程中断裂原因分析及补救方法

H_1Cr_(21)Ni_(10)Mn_6不锈焊丝在冷拉过程中会出现断裂现象。其主要原因是H_1Cr_(21)Ni_(10)Mn_6钢中α相含量过高所致。为防止断裂的发生应适当增加退火道次,减少单道次变形量及控制总变形量,改善润滑条件。     

SPHD深冲钢关键元素控制实践

从日钢SPHD深冲钢生产实际出发,分析了该钢种C、O、P、S、N等关键元素的控制要点;转炉终点C含量介于0.04%~0.07%的比例达到79.3%,中间包平均C 0.015%;铸坯O控制在22×10-6左右,中间包平均P 0.015%,中间包S控制在0.011%左右,坯样N≤30×10-6合格率为86.6%。     

拉深件毛料外形的计算机辅助模拟与实验验证

汇场法已被证明是一种可行的理论方法。本文进一步研究了它对平面异形拉深零件外形的自动处理,绘出了自动绘制出的异形件毛料外形,用拉深实验检验了汇场法自动确定的几件典型零件毛料外形。在此基础上,提出了汇场法对设置拉深凸埂的指导作用,同时指出汇疡法确定毛料外形的精度可通过汇强的调整来改善。     

喷焊技术在水箱拉丝机耐磨件上的应用

介绍了喷涂(焊)的原理和技术要求,采用先喷后熔的喷焊方法,把硬质合金或金属合金粉末牢固的喷焊在需要修复的水箱拉丝机卷筒和塔轮上,使磨损件再次利用,降低了生产成本。     

退火方式对深冲压钢板晶粒尺寸不均匀性的影响

对连续退火或罩式退火后的深冲钢板和超深冲钢板的组织以及织构进行了观测和分析.结果表明,罩式退火后钢板表面晶粒比心部的细小,而连续退火后钢板表面晶粒比心部的粗.这种区别主要来源于热轧钢板原有组织和织构的不均匀性,退火加热过程也会对钢板表面和心部晶粒尺寸的不均匀性产生很大影响.     

Metallurgical Studies of Austenitic Stainless Steel 304 under Warm Deep Drawing

Austenitic stainless steel 304 was deep drawn with different blank diameters under warm conditions using 20 t hydraulic press. A number of deep drawing experiments both at room temperature and at 150 ℃ were conducted to study the metallography. Also, tensile test experiments were conducted on a universal testing machine up to 700 ℃ and the broken specimens were used to study the fractography of the material using scanning electron microscopy in various regions. The microstructure changes were observed at limiting draw ratio （LDR） when the cup is drawn at different temperatures. In austenitic stainless steel, martensite formation takes place that is not only affected by temperature, hut also influenced by the rate at which the material is deformed. In austenitic stainless steel 304, dynamic strain regime appears above 300 ℃ and it decreases the formability of material due to brittle fracture as studied in its fractography. From the metallographic studies, the maximum LDR of the material is observed at 150 ℃ before dynamic strain regime. It is also observed that at 150 ℃, grains are coarse in the drawn cups at LDR.