车架纵梁冲孔模装配调试

分析了车架纵梁冲孔模结构,提出了特大型模具装配调试的难点,在模具生产中没有调试模具用的大型冲压设备情况下,结合模具结构和生产设备的现状,提出了可行、较简便的调模工艺方法,解决了特大型冲孔模的装配调试难点。     

超大型回转体盘饼类模锻件模具设计

以大型汽轮机转子叶轮为例，针对直径在Ф1000mm以上的特大型薄饼类锻件的锤上模锻进行了工艺分析，并采用旋转分步锻造法^[1]，设计了特殊结构的模具，解决了普通锻锤设备打击能量严重不足的矛盾。经生产证明，模具使用可靠，工艺方法可行，为超大型盘饼类模锻件的生产提供了成功的经验。     

低压铸造铝合金车轮材料力学性能影响因素的分析

以低压铸造铝合金车轮生产工艺为主线,分析了生产过程中对车轮材料力学性能的影响因素,着重阐述了铝锭内部品质及熔炼工艺、铸造装备及配套设备、铸造工艺与模具结构、热处理工艺控制的重要性。     

风叶传动盘压铸模的设计

根据风叶传动盘的结构和性能、成型工艺特点、技术要求和合金种类,并考虑所选压铸机的类型,设计了压铸模具的浇注系统,确定了模具的整体结构和各组成部分的尺寸。同时考虑到实际生产上的因素,对压铸工艺和主要参数进行分析,从而达到对风叶传动盘的合理设计的要求,设计出相应的模具。     

大功率柴油机KV_(12)曲轴在1MJ对击锤上的模锻

本文对KV12曲轴的结构特点和在1MJ对击锤上模锻的工艺过程进行了分析。对大型曲轴模具提出了新的设计参数,为大型模具制造和使用提供了可借鉴的生产经验。     

导轮砂芯的结构改进

描述了分模方式及工艺选择对生产过程的影响,分析热芯盒与冷芯盒在制作复杂砂芯过程中的优缺点,并描述导轮铸件冷芯模具的结构及制芯流程。通过工艺方法的改变能够简化生产过程,减少操作工人的工作量,提高生产效率,改善产品质量。     

铜V形件成形工艺设计

对铜V形件形状复杂、V形角度不易保证、加工难度大等特点和产品工艺要求进行了分析,结合现有的生产设备与生产技术,制订了合理的工艺方案。介绍了挤压模具、拉拔模具及冲压模具的设计结构和工作过程,模具挡板、凸模、成形凹模、V形凹模等结构的设计,保证了铜V形件顺利成形。批量生产结果表明,该工艺和模具结构设计合理,操作方便,产品质量稳定,生产率高,取得了良好的经济效益。     

大型钛合金压气机盘超塑性等温锻造模具结构及工艺参数实验研究

通过超塑拉伸和压缩试验，用金属铅进行模拟实验，探讨了大型ＴＣ１１合金压气机盘超塑性等温锻造的工艺参数，模具结构，锻坯形状尺寸及润滑剂的选择、并讨论了其模具材料及加热方式的选择。     

风电塔架门框新型锻造工艺的研发与应用

风电塔架门框是风电塔架的重要组成部分,其尺寸要求严格,传统锻造工艺复杂,生产困难。现根据实际生产设备、零件尺寸、形状及材料特点,开发一种新型风电塔架门框的锻造工艺。该工艺在"前期计算"过程中,结合相关公式,计算出风电塔架门框锻造过程中所需的各种主要参数,方便确定原材料使用规格及生产过程中的使用设备;利用辗环技术降低了原材料的使用量;在分析验证过程中,使用ANSYS Workbench对该工艺预压后模具成形过程中的模具成形工步进行有限元分析,预先观测到模具冲入时,风电塔架门框的塑性变形情况,准确确定预压成形尺寸及模具尺寸,为内椭圆等截面型风电塔架门框的生产提供了一种新思路与新方法。     

上心盘锻压成形工艺及模具

从分析上心盘的成形过程出发，介绍了上心盘热模压成形工艺及模具特点。     

镁合金板料热拉深成套装备及实验研究

镁合金作为21世纪绿色工程金属结构材料,必将成为汽车、摩托车等交通工具、计算机、通讯、仪器仪表、家电、轻工、军事等行业的重要选材.镁合金板料冲压加工技术已成为有关领域研究的热点,设计镁合金板料热成形成套装置很有意义.本文对镁合金板料加热系统原理和结构以及热冲压模具的加热系统进行了研究,设计了镁合金板料热成形用的整套试验装置,并利用该装置进行了镁合金板料成形的有关试验,得出了一些初步结论.成套装备的开发为镁合金板料热冲压成形的深入研究奠定了基础.     

大规格电镦侧模辅助成形方法及装置研究

本文主要针对大规格电镦过程中形状缺陷和晶粒粗化等问题,提出了大规格电镦侧模辅助成形方法并设计了电镦侧模辅助成形装置,为大规格电镦生产提供新思路和方法。在Marc分析平台建立多尺度电镦工艺有限元分析模型及侧模辅助成型模型,对比两种成型方法模拟结果,发现电镦侧模辅助成形方法既能优化电镦件的形状避免宏观缺陷,又能有效的调控微观组织实现晶粒细化。并针对直径57mm的Nimonic 80A超合金杆坯,进行了侧模温度和侧模下压量等参数的优化。     

多点成形技术及其发展

多点成形技术是板材柔性成形的方式之一,可以快速、低成本、高质量的成形,提高经济效益。本文主要介绍多点模具及多点压机两种成形方式,板料多点成形方法的技术特点、成形工艺的研究现状、成形设备的开发现状以及成形技术的应用情况。通过分析多点成形的优缺点,探讨其发展趋势。     

Superplastic Response of Continuously Cast AZ31B Magnesium Sheet Alloys

Magnesium sheet is typically produced for commercial applications with the traditional DC-ingot casting method. As a result of the hexagonal close-packed crystallographic structure in magnesium, multiple rolling passes and annealing steps are required to reduce the thickness of the ingots. Thus, high fabrication costs characterize the creation of magnesium sheet suitable for common forming operations. Recently, continuous casting (CC) technology, where molten metal is solidified directly into sheet form, has been applied to magnesium alloys; this method has shown the potential to significantly reduce the cost of fabricating magnesium sheet alloys. In order to understand the viability of the CC process, a study was conducted to investigate the superplastic potential of alloys produced by this method. This study focused on AZ31B Mg that was continuously-cast on twin-roll casters from three different suppliers. These three materials were compared with a production DC-cast AZ31B alloy in terms of microstructure, elevated-temperature tensile properties, and superplastic forming response. The data from this study found that microstructural features such as grain size and segregation can significantly affect the forming response. Additionally, the CC alloys can have equivalent or superior SPF response compared to DC-cast alloys, as demonstrated in both elevated temperature tensile tests and superplastic forming trials using a rectangular pan die.     

Superplastic forming characteristics of fine-grained 5083 aluminum

Superplastic forming characteristics of a fine-grained 5083 aluminum sheet have been investigated by means of gas-pressure forming of a rectangular pan. This part geometry lends itself to a simple representation in terms of nearly one-dimensional sheet stretching and permits reasonably rigorous control of strain rate throughout the forming cycle. This study followed a study of the uniaxial tensile properties carried out on this alloy. A two-stage forming cycle, which comprised a short, rapid prestraining stage followed by a stage of slower rate of superplastic straining, was used because the uniaxial tensile work showed enhancement of superplastic response of this alloy under this condition. The study examined the effect of process parameters such as initial gas pressurization rate, level of hydrostatic pressure, and lubricants on the thinning characteristics of the sheet, especially along the die entry radii. The gas pressure/time cycle was suitably modified to avoid premature sheet failure due to excessive sheet thinning or cavitation. Cavitation under the biaxial forming condition and the effect of hydrostatic pressure on cavitation suppression were evaluated. A defect-free pan with sharp corners was formed.     

Cavitation behavior in superplastic 5083 Al alloy during multiaxial gas blow forming with lubrication

Despite its importance for industrial applications, the effect of lubrication on the cavitation behavior of superplastic materials has been given little attention. In this paper, a series of experiments were performed regarding bulging superplastic 5083 Al alloy sheet into dies with a cylindrical (cup) and rectangular (pan) die cavity for forming with and without lubrication, the formed parts were then evaluated to determine the effect of lubrication on the cavitation level evolution, thickness distribution, and void distribution. It was found that void shrinkage took place in the overlaid region for both forming with and without lubrication. The maximum void volume fraction could be effectively reduced for forming with lubrication; however, reductions in the maximum void volume fractions for cup forming were less significant than those for pan forming.     

超越齿轮冷挤压复合成形工艺的有限元模拟

对超越齿轮的冷挤压成形方案和改进后的方案进行有限元模拟分析，确认在挤压过程中出现的上部内腔底部塌陷和下部齿裂的原因是由于工件中心部分金属流动较快造成的，从而对生产工艺进行了改进并进行计算机模拟，以此确定挤压后合理的预制坯形状和模具结构。最后指出工艺与模具设计和仿真并行，可有利保障生产工艺的可行性和模具设计的可靠性。     

铝合金不粘锅压铸模浇注系统设计及充型模拟研究

针对铝合金压铸不粘锅锅型较深、后续表面喷涂中极易产生各种缺陷的问题,对某厂铝合金不粘锅进行了浇注系统设计,并利用数值模拟软件PROCAST和FLOW-3D进行了充型对比模拟,根据模拟结果的对比分析重新设计了浇注系统。     

杯形件成形工艺与模具设计

分析了杯形件成形的难点,并针对这些难点制定了相应的工艺方案和有效的解决措施,研制了相应的模具,对试验中出现的问题采取了可行的措施,解决了成形过程中的难题.试验结果表明:该工艺切实可行,模具使用效果和产品质量很好,减少了生产成本.     

太阳能电动车碳纤维车身成型方法

在1/5太阳能电动车碳纤维车身模具与模型已经制作成功的基础上,总结了碳纤维车身成型的经验和方法,研究了车身成型模具的设计、制作工艺及其碳纤维车身的成型过程。针对车体模型的质量控制、模具切片方法选择等关键问题进行分析讨论,完成了车身模具与模型的设计和制作。