带切换机构的斜楔在汽车顶盖模具的应用与研究

介绍了一种带切换机构的开花斜楔在汽车顶盖翻边模具中的应用,通过对顶盖的冲压工艺及模具结构的分析,采用一种气动切换机构和开花式的斜楔机构,实现了有天窗和无天窗两种状态顶盖的翻边工艺在同一副模具上进行,阐述了顶盖翻边开花斜楔及切换机构的结构及工作原理,设计的结构具有降低模具工装开发成本、节省冲压车间占用面积和提高工作效率的特点,经过实物生产验证,生产的有天窗及无天窗顶盖的总精度均达到了94%,满足了轿车对外板件的精度要求。     

汽车顶盖天窗侧整形模设计

通过对汽车顶盖零件特点分析,介绍了顶盖的冲压工艺,设计了顶盖天窗侧整形模。根据生产需要,在第四工序的天窗翻边部位设计三组侧整形斜楔,侧整形凸模、凹模均要设在下模,模具可以成形出有天窗和无天窗的汽车顶盖这两种制件。重点介绍了顶盖天窗侧整形模中的两种双动斜楔结构的应用,在顶盖天窗左边位置采用两组对向的电车斜楔,布置在下模中部区域附近,由两个驱动块分开驱动,模具调整方便,结构稳定性好;在天窗前后侧位置采用复动斜楔,模具结构紧凑,节省了模具空间。通过本模具中对双动斜楔的灵活运用表明,模具结构稳定可靠,方便了制造与调试,节约了成本,保证了产品质量,提高了生产效率。     

轿车顶盖模具天窗的冲翻方式

介绍了带下压料的天窗冲翻结构在轿车顶盖天窗中的应用。通过对顶盖的冲压工艺以及对顶盖模具的结构的分析,在无顶盖天窗模具后增加一副带下压料冲翻结构的模具,实现轿车顶盖有天窗和无天窗两种状态。与传统的顶盖生产模具相比,该结构不仅能够降低模具设计开发成本,也能够节省冲压车间的占用面积,还可以提高模具的生产效率;与带有切换机构的顶盖生产模具相比,该结构能在一定程度上改善制件缺陷,提高带天窗制件的匹配度,增加客户满意度。     

某车型顶盖天窗与非天窗防错研究与应用

针对某车型顶盖天窗与非天窗切换无有效防错导致模具受损的问题,在剖析顶盖天窗与非天窗切换模具结构原理的基础上,借鉴零件成形到位检测的思路,分别在修边、正翻边、侧整形工序中的顶盖天窗整形驱动垫块两侧加装感应器,利用感应器检测的信号作为压力机下行的判定条件,并更改压力机整线控制PLC程序,实现压力机的启停或自动报警停线。生产试验表明,该改进方案可有效建立成形天窗与非天窗切换防错机制,规避人工确认不到位造成模具受损的风险,为汽车覆盖件冲模的设计提供参考。     

全景天窗顶盖侧整形模设计

以某车型全景天窗顶盖为例,通过对零件结构进行分析,介绍了全景天窗顶盖冲压工艺,设计了用于成形全景天窗口部特征的侧整形模,并阐述了2种双动斜楔机构在全景天窗顶盖侧整形模中的应用。实际应用表明,凹模扩张斜楔机构与凹模收缩斜楔机构的联合使用,使模具机构更加紧凑和稳定,实现了全景天窗口部沿周负角法兰的同步成形,减少了成形工序,降低了零件制造成本。     

汽车翼子板四序化冲压工艺方案及翻边整形模设计

通过对汽车翼子板产品成形性及模具结构可实现性的分析,合理排布各序冲压工艺内容,并采用旋转斜楔机构有效实现了翼子板四序化生产。介绍了一种可实现四序化生产的汽车翼子板冲压工艺方案及其翻边整形模设计,重点讲述了该工艺方案中各工序的工作内容、设计要点以及两种不同形式的旋转斜楔机构的结构及工作原理。旋转斜楔机构的应用可缩短模具长宽方向上的工作行程,减小了安装空间,有利于更多的工作机构在同一副模具内安装。实际生产证明,该冲压工艺方案可有效降低冲压工序数,减少模具工装开发成本及后期生产成本,提高生产效率。     

轿车侧围外板冲压成形工艺优化

通过分析轿车侧围外板结构特点及成形工艺过程,采用特殊的复合结构模具,通过修边与整形复合、直翻边整形与斜楔翻边复合及直翻边与斜楔冲孔复合,使轿车侧围外板冲压工序由5道减少至4道。经生产证明:优化后的冲压工艺可行,模具数量减少,缩短了模具生产周期,提高了生产效率,降低了制造成本,为类似冲压件的工艺设计提供了有益借鉴。     

翻边整形工艺对纵梁类制件精度的影响

介绍了冲压模具中翻边整形工艺对汽车车身纵梁类制件精度的影响,翻边整形工艺的结构设置及优化降低纵梁类制件反弹、扭曲缺陷从模具工艺上的解决方法,并从日常生产质量控制、工艺设计、冲压模具结构等方面,简述了合理的模具设计及翻边整形工艺结构、角度设置对改善汽车车身纵梁类制件反弹缺陷的重要性。     

顶盖整形工艺分析及模具设计

介绍了汽车上常见的外覆盖件冲压工艺方案的确定过程，并以”郑州尼桑“轻型皮卡”顶盖“为例，针对此件成形难，取件难这一难点，确定了是冲压工序为：拉延、修边、翻边、整形。且着重整形模具的设计要点及整形以后顺利取件等措施。     

顶盖整形工艺分析及模具设计

介绍了汽车上常见的外覆盖件冲压工艺方案的确定过程,并以“郑州尼桑”轻型皮卡“顶盖”为例,针对此件成形难,取件难这一特点,确定了合理的冲压工序为①拉延②修边③翻边④整形,且着重介绍整形模具的设计要点及整形以后顺利取件等措施。     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。     

Three-Dimensional Growth of Coherent Ferrite in Austenite: A Molecular Dynamics Study

Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.     

Effect of Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(BiLa_xFe_(1-x)O_3)–0.5(PbTiO_3)

The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5(Bi LaxFe1-xO3)–0.5(Pb Ti O3)(x = 0.05,0.10,0.15,0.20)(BLxF1-x-PT) were prepared by mixed oxide method.Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature.The lattice parameter c/a ratio decreases with increasing of La(x = 0.05–0.20) concentration of the composites.The effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range(102–106Hz) at different temperatures.The nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the composites.The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials.The ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures(200–300 °C).     

Quantitative Analysis of the Crystallographic Orientation Relationship Between the Martensite and Austenite in Quenching–Partitioning–Tempering Steels

The orientation relationships(ORs)between the martensite and the retained austenite in low-and medium-carbon steels after quenching–partitioning–tempering process were studied in this work.The ORs in the studied steels are identified by selected-area electron diffraction(SAED)as either K–S or N–W ORs.Meanwhile,the ORs were also studied based on numerical fitting of electron backscatter diffraction data method suggested by Miyamoto.The simulated K–S and N–W ORs in the low-index directions generally do not well coincide with the experimental pole figure,which may be attributed to both the orientation spread from the ideal variant orientations and high symmetry of the low-index directions.However,the simulated results coincide well with experimental pole figures in the high-index directions{123}_(bcc).A modified method with simplicity based on Miyamoto’s work was proposed.The results indicate that the ORs determined by modified method are similar to those determined by Miyamoto’method,that is,the OR is near K–S OR for the low-carbon Q–P–T steel,and with the increase of carbon content,the OR is closer to N–W OR in medium-carbon Q–P–T steel.     

Effect of Short-Time Aging on the Pitting Corrosion Behavior of a Novel Lean Duplex Stainless Steel 2002

The effect of short-time aging in the temperature range between 400 and 1000 °C on the pitting corrosion behavior and mechanical property of a novel lean duplex stainless steel(LDSS) 2002 was investigated through the potentiostatic critical pitting temperature(CPT) tests and the Charpy impact tests. Both the pitting corrosion resistance and the toughness of aged specimens degraded due to the precipitation of detrimental secondary phases and the most significant reduction of CPT and impact energy emerged at 650 °C concurrently. The CPT of LDSS 2002 specimen aged at 650 °C decreased by 28 °C, and the impact energy dropped from 69 to 29 J/cm~2 compared with the solution-annealed sample. Transmission electron microscopy characterization showed that the main precipitates in LDSS 2002 were Cr_2N and M_(23)C_6 along the ferrite–austenite grain boundaries.     

Information for Contributors

正The Transactions of Nonferrous Metals Society of China,founded in 1991 and sponsored by The Nonferrous Metals Society of China,is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology,including mineral processing,extraction metallurgy,metallic materials and heat treatments,metal working,physical metallurgy,powder metallurgy,with the emphasis     

Preface

<正>We are pleased to present this Special Issue of Transactions of Nonferrous Metals Society of China containing selected papers from the First Asian Conference on Aluminum Alloys(ACAA-2013),held in Beijing,China,13–17 October 2013.This conference has been initiated,with approval of     

Information for Contributors

The Transactions of Nonferrous Metals Society of China, founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, 1NSPEC, CA, METADEX, AJ and JICST.