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汽轮机低压转子的终锻成型通常使用上平下V砧进行拔长,锻件变形很不均匀且晶粒分布均匀性较差,为后续热处理增加了难度。通过拔长缩比试验结合DEFORM-3D数值模拟,以30Cr2Ni4MoV低压转子钢为研究对象,将控制轴类锻件组织不均匀性作为目标,对不同拔长工艺进行对比,探究变形量和变形温度对锻件微观组织均匀性的影响。数值模拟与物理模拟结果表明,变形量和温度对锻件内部晶粒度影响较大,通过增加变形量,提高锻造温度,能够较为有效地控制锻件组织均匀性;当锻造温度为1 250℃,锻比为1.2~1.3时,锻件组织均匀性最佳。研究结果可为汽轮机转子终锻成形工艺的制定提供参考。 相似文献
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王德拥 《机械工人(热加工)》1982,(11)
七、大型锻件的锻造比大型锻件的锻造比,由产品技术条件或国标、部标、厂标来规定。为了消除缺陷、确保质量,设计部门往往对一些承受重载荷的零件提出很大的锻造比要求,如发电机转子轴等,其总锻造比都在6以上。在锻造过 相似文献
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发电机转轴是经过锻造、机械加工等工艺过程制造的圆柱体钢锻件。在这些工艺过程中,由于在锻造、机械加工过程中,锻件内不均匀的力场、温度场或材料场,使锻件本身产生一种内应力,即残余应力。如果残余应力较大,则会产生转子锻件严重的变形。我厂购买的四根QF1.5—4 1500kW发电机转轴,在成品制造 相似文献
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大型核电低压转子锻件倒棱新工艺的模拟 总被引:2,自引:0,他引:2
低压转子是核电机组关键零部件.低压转子锻件方截面坯料倒棱工艺一般采用普通平砧或无曼内斯曼效应的锻造法(Free from Mannesmann effect,FM)法,锻坯的变形仅集中在表层,难以深入心部,这浪费了倒棱工艺的大压下量.提出一种新的改进工艺方案,采用V形砧倒棱工艺来改善锻件心部应力应变状态,并通过数值模拟和物理模拟相结合的方法对其应力应变的分布进行研究.模拟结果表明,采用V形砧倒棱工艺,锻件心部等效应变增加,静水压力增大,随V形砧角度的减小应力应变分布效果更好;本质为型砧侧壁和锻件的接触面积的增加,使得接触处形成难变形区,从而使锻件取得更好的心部应力应变条件.连砧倒棱在两砧相搭接处对应区域存在小变形区,可以通过错砧工艺进行消除.建议倒棱工艺采用V形砧,角度小于等于120°,压下率大于20%,连砧错砧. 相似文献
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孙月芳 《机械工人(热加工)》1985,(1)
我厂在4吨·米无砧座锤上进行模锻生产,其产品有船用转环、活塞芯、陀罗转子、煤矿用手把体、顶盖等锻件。在生产中一直采用两种锻模结构:对简单锻件采用圆柱形锻模(如图1),无定位装置、只有简单的圆周导向,这种锻模结构简单,加工方便,但在锻造时,由于锻造设备精度较差,上下模之间容易错移(2~4毫米),影响锻件质量,对切除锻件飞边也带 相似文献
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根据电机行业中各种电机转子轴的长度和大小不同、不同型号电机的转子轴在转子铁芯的定位不同以及轴与铁芯孔的配合不同等技术要求,研制一种电机转子入轴液压压力机,并针对电机自动化生产工序之一电机转子入轴工序的设备设计,提出一种基于计算机三维软件设计电机转子铁芯入轴小型液压压力机的模式,采用Solidwords三维绘图软件,达到直观、高效设计压力机机身结构和夹具,并根据不同技术要求,利用计算机辅助三维绘图软件强大功能,可快速地改变主机机身、夹具的设计。 相似文献
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为探究端壁造型对涡轮动叶气动性能及流场特性的影响,分析非轴对称端壁造型对涡轮转子叶片的压差作用,开展基于非轴对称端壁造型的理论研究,提出一种涡轮动叶轮毂上凸、下凹的造型方案,研究非轴对称端壁造型对涡轮流场二次流损失的影响。数值模拟分析表明:非轴对称端壁造型对减小横向压差具有重要作用,在动叶轮毂鞍点处进行非轴对称端壁造型,比在通道内造型效果更好;涡轮动叶下端壁不同区间造型可有效降低涡轮动叶通道内的二次流流动损失,使用非轴对称端壁造型方法可有效地减小动叶出口总压损失系数0.132 2%。 相似文献
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Development of a Remote Collaborative Forging Engineering System 总被引:2,自引:2,他引:2
J. P. Tsai Y.-C. Kao R. S. Lee 《The International Journal of Advanced Manufacturing Technology》2002,19(11):812-820
The ever-growing demand for high-quality products with lower cost and shorter time-to-market is a challenge in today’s global
market. This paper presents a methodology for merging the new technologies of networking and multimedia, with a conventional
forging system to form a remote collaborative forging engineering system. The activities of conventional forging engineering
design and manufacturing processes planning were analysed and a structural model is proposed for forging enterprises to investigate
and improve their engineering activities. The synergy of networking and multimedia technologies is adopted in communicating
and coordinating the activities of the engineers of a multinational enterprise dispersed in different locations, using computer
supported cooperative work. For the next generation forging engineering environments, the concept of a remote collaborative
forging engineering system provides a new approach and strategy to enhance their competitive advantages; and it also provides
a fast, economical and experience-sharing method for the enterprises. An industrial example is used to illustrate the proposed
system. 相似文献
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汽轮机转子锻件高温扩散退火工艺的试验研究 总被引:1,自引:0,他引:1
基于试验方法,结合高中压汽轮机转子锻件实际生产工艺,研究了不同保温时间、锻造火次处理后晶粒尺寸、组织、力学性能的变化规律,揭示了高温扩散退火对30Cr1Mo1V钢的影响。试验结果表明:高温扩散退火可消除因枝晶偏析与锻造变形产生的条带组织;只在锻前进行高温扩散退火,试样晶粒尺寸较小,且扩散的均质化作用提高了30Cr1Mo1V钢的横向韧性;锻后长时间高温加热将导致晶粒过大、组织粗化,大大降低了韧性;高温扩散退火对30Cr1Mo1V钢塑性无显著影响。 相似文献
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To evaluate the accurate performance and characteristics of turbomachinery, it is important to measure the unsteady flow phenomena
downstream of the rotating blades. This paper presents the development of a fast-response total pressure probe for the measurement
of the total pressure field at the exit of blades. The result of measurement in a one-stage axial turbine is also presented.
The fast-response total pressure probe is fabricated by installing a fast-response pressure sensor in the cylindrical head
of the probe. In terms of simplicity of the measurement system and data reduction method, this method is more competitive
over established methods that use more than four sensors. The probe is applied to the one-stage axial turbine in order to
measure the instantaneous total pressure downstream of rotor blades. The measured instantaneous signal is decomposed to obtain
the blade-to-blade pressure distribution. The pressure distribution due to blade passing is clearly captured. Due to the loss
generation in the casing region, the total pressure and its amplitude of fluctuation by the blade passing are lower in the
shroud and hub region than in mid-span. The total pressure distribution at the exit of the rotor blade is found to be slightly
different from blade to blade due to the geometric difference and the different relative positions of the rotor blades and
stator vanes. The developed probe successfully measures the accurate total pressure distribution at the rotor exit, and allows
the evaluation of the loss distribution and the accurate performance of turbomachinery. 相似文献