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新疆钢铁公司炼钢厂的氧气顶吹转炉的除尘引风采用上海鼓风机厂生产的D250-11煤气鼓风机.风机发生故障后曾四次发现叶轮轴φ480轴颈严重磨损,采用了焊补工艺修复.由于未经热处理,重新车制后的φ80轴颈端热应力集中.经几个周期使用后探伤发现,三个焊补修复的叶轮轴在φ80轴颈端均出现周向裂纹,且有一叶轮轴在运行中突然从轴颈端断裂. 相似文献
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某炼钢厂100t渣车在使用过程中,出现车轮轴频繁断裂问题。从渣车车轮轴结构出发,计算车轮轴的受力情况,并综合分析设计制造环节等方面因素,总结了最终导致车轮轴在工作中频繁断裂的原因,对于改进渣车车轮轴的设计制造提供了一定的参考。 相似文献
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拖拉机驱动轮轴在工作中受力大且复杂,容易发生早期断裂。针对某型号拖拉机在装配试车时,发生驱动轮轴齿条断裂和键槽开裂掉块现象,我们从金属材料及热处理等方面对其产生原因进行了分析。结果表明,驱动轮轴的齿条、键槽壁部位为感应淬火疑难部位,该部位在感应淬火时易产生淬火裂纹。通过感应淬火工艺调整和改进,避免了感应淬火裂纹的产生,并使驱动轮轴感应淬火硬化层深符合技术要求,满足了用户对驱动轮轴的正常使用要求。为驱动轮轴类零件结构设计、工艺流程设计和热处理技术要求提供有效的指导。 相似文献
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太阳轮轴作为绞车的关键部件,由于其结构变形、磨损严重、结构断裂等故障而导致绞车无法正常运转,严重影响着绞车的作业效率及运行安全性,因此,以绞车结构组成及使用特点为基础,采用Solidworks及ABQUAS软件,建立了太阳轮轴的仿真模型,分别对太阳轮轴结构性能及结构改进进行了分析,并且模拟了太阳轮轴在实际使用过程中的应力变化仿真分析研究。该研究对提高轮轴的结构性能、保证其使用安全及绞车的正常运行具有重要意义。 相似文献
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淬火介质对保证淬火工艺实施有重要作用。采用水或油作为淬火介质,均存在一定缺陷,不能满足合金结构钢前轴锻件热处理的需要。通过分析理想淬火介质的冷却曲线,发现一种新型PAG淬火介质的冷却特性可以满足要求。介绍了这种新型淬火介质的冷却原理、使用条件及技术要点。并结合实践,介绍了该介质在合金结构钢前轴锻件(42CrMo材质中重型前轴,120~140kg)热处理生产过程中的使用情况。 相似文献
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重载货车车轮踏面制动辐板热应力分析 总被引:1,自引:0,他引:1
采用大轴重货车是解决我国铁路货运能力不足的主要途径之一,然而提高轴重意味着车轮踏面所受的制动热负载将会增大,这可能导致大轴重货车车轮辐板热损伤加剧。因此,有必要通过对不同轴重车轮热应力的对比分析,揭示轴重大小对车轮辐板损伤的影响规律,为制定大轴重货车运行和制动条件提供支持。提出研究此问题的新思路,采用热弹塑性有限单元法,模拟在热处理工艺过程中车轮辐板残余应力分布状况,使得车轮存在仿真制动工况所需的初始残余应力。对重载运煤专线—大秦线全程循环制动进行模拟,计算得到车轮制动功率—时间历程,仿真在此工况下30 t重载货车车轮辐板的温度场和热应力场的分布状况。计算比较21 t、25 t和30 t轴重货车车轮在大秦线全程循环制动中热应力和制动完全结束后的残余应力的变化规律。结果表明,车轮在热处理后,车轮辐板残余应力是不可忽视的。随着轴重的增大,车轮辐板将承受更大的热应力和残余应力。 相似文献
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针对电动汽车运行的各种工况,在整车条件下采用计算流体力学(CFD)数值计算的方法对外转子轮毂电机的温升性能进行了仿真计算,并分析了汽车来流速度、电机轴的热导率对轮毂电机散热性能的影响。研究结果表明:来流风冷散热条件下,电动车在高负荷工况下电机的温升过大,可通过加装散热翅片或者采用水冷散热等方式来达到对电机的散热冷却效果;重复制动工况中,制动盘的高温热辐射没有使电机的温升恶化;汽车前方来流速度对电机的温升影响较大,电机轴的热导率对电机的温升影响相对较小。 相似文献
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连续挤压成形过程中挤压轮速度的影响 总被引:2,自引:0,他引:2
在连续挤压成形过程中 ,挤压轮旋转 ,在变形体和模具接触面上的摩擦功和塑性变形功的作用下 ,变形体在塑性变形的同时 ,与模具及周围环境进行热交换 ,促使变形体和模具内的温度场以及变形体的应变场、应力场等不断发生变化。因为挤压轮的转动是连续挤压成形过程的动力源 ,其速度构成了连续挤压成形过程中最重要的影响因素 ,所以研究挤压轮速度对连续挤压成形过程中变形体的温度场、应力场、应变场以及溢余量的影响 ,将有助于连续挤压产品的内部质量和尺寸精度的提高。本文在分析连续挤压技术特点的基础上 ,采用刚粘塑性有限元模型 ,组建了一个有关连续挤压的计算机仿真系统 ,对连续挤压的成形过程进行了计算机仿真 ,研究了挤压轮速度对连续挤压成形过程的影响 相似文献
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高锰钢前导轮内腔结构复杂,需要合理的铸造工艺以避免填内部产生铸造缺陷。为此,采用商业软件ProCAST对导轮轴孔处设一个明冒口的单冒口工艺(SR)和两个明冒口的双冒口艺艺(DR)进行缺陷预测、计算发现,单冒口工艺(SR)的缺陷形成倾向低于双冒口的工艺(DR)。进而,通过调整单冒口工艺(SR)的冷铁形状、位置及增大轮缘处暗冒口体积.提出优化工艺M1;在M1基础上,通过减小轴孔处明冒口体积,并加大该处冒口保温砖厚度,提出优化工艺M2,模拟计算表明,采用M1和M2工艺均可消除导轮轮缘处的缩孔缩松缺陷;以M2的热裂倾向最小,热裂纹主要出现在前导轮内腔垂直拐角处和轴孔附近。 相似文献
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Haitao LUO Qiming WEI Yuxin LI Junlin LI Wei ZHANG Weijia ZHOU 《Frontiers of Mechanical Engineering》2023,18(2):16
To examine the environmental characteristics of the microgravity force and the weathered layer on an asteroid surface, a symmetric wheel brush asteroid sampler is proposed for the collection of particles on the asteroid surface. To study the influence of the wheel brush rotation speed on the sampling efficiency and the driving torque required for the wheel brush, the contact dynamics model between particles and sampling wheel brushes is established and a simulation and experimental verification of the sampling process are conducted. The parameter calibration of the sampled particles is studied first, and the calibrated particle parameters are used in the numerical simulation of the sampling process. The sampling results and the particle stream curves are obtained for the working conditions of different rotation speeds, and the effects of different parameter settings on the sampling efficiency are analyzed. In addition, a set of rotating symmetrical sampling wheel brush devices is built for the ground test, and the dynamic torque sensor is used to test the torque change of the wheel brush during the sampling process. The relationship between the speed of the wheel brush and the driving torque of the wheel brush motor is determined by comparing the simulation results with the test results. Results indicate that when the rotating speed of the wheel brush is faster, the sampling efficiency is higher, and the driving torque required for the sampling wheel brush is greater. Moreover, a numerical simulation analysis of the sampling process of the wheel brush sampler in a microgravity environment is conducted to determine the optimal speed condition, and the brushing test of the wheel brush sampler in the microgravity environment is verified with the drop tower method. This research proposes the structural optimization design and motor selection of a wheel brush asteroid sampler, which provides important reference value and engineering significance. 相似文献
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Ooi JongBoon Wang Xin Tan ChingSeong Ho Jee-Hou Lim Ying Pio 《Journal of Mechanical Science and Technology》2012,26(2):575-589
The portal axle is a gearbox that is specially designed for off-road driving conditions. It is installed between the wheel
and the axle shaft to give higher ground clearance to the vehicle. The modeling and simulation of spur gears in portal axle
is important to predict the actual motion behavior. However, gear train design in portal axle is difficult to study comprehensively
due to their relatively low cost and short product life cycle. In this study, modal analysis of portal axle is simulated using
finite element method (FEM). Modal analysis is simulated on three different combinations of gear train system commonly designed
for portal axle. The three gear trains being analyzed are gear train without idler gear, one idler gear and two idler gears.
FEM static stress analysis is also simulated on three different gear trains to study the gear teeth bending stress and contact
stress behavior of the gear trains in different angular positions from 0° to 18°. The single and double pair gear teeth contact
are also considered. This methodology serves as a novel approach for gear train design evaluation, and the study of gear stress
behavior in gear train which is needed in the small workshop scale industries. 相似文献