共查询到18条相似文献,搜索用时 296 毫秒
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工艺参数对热锻模表层温度的影响模拟分析 总被引:1,自引:1,他引:0
热挤压模寿命由于高的热载荷引起其表面层软化而大大下降。本文以套管叉热挤压凸模为例,用DEFORM3D软件对表层温度进行了系统的模拟分析,研究了坯料温度、摩擦因子、压机速度、模具初始状态对模具表层温度场的影响并将所得的数据引入Matlab中进行拟合,找出其变化规律。结果表明:为防止模具表面变形,在设计模具的表层结构和热循环载荷时应特别注意以下两点:①在生产过程中,模具的软化层应小于其表面硬化层;②模具表面的最高温度应小于模具材料的回火温度。 相似文献
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针对气门热锻模具的早期疲劳失效,结合MSC.Marc和MSC.Fatigue数值模拟软件对气门热锻模具的成形过程进行热机耦合模拟,并进行热作模具钢H13(4Cr5MoSiV1)凹模的疲劳仿真与低周疲劳寿命预测。对凹模在热锻过程中的温度分布、等效热应变分布、应变-寿命曲线、周期性变化的节点等效应力等因素进行模拟分析,最终获得了凹模的疲劳寿命分布云图。研究结果表明:最先发生失效的位置在凹模R根部区域,寿命仅1460次,与实际生产情况中模具的失效位置及寿命值相符合,实现了气门热锻模具的疲劳寿命模拟预测。 相似文献
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工作温度对热锻模的寿命有很大影响,热锻模的失效与其所受热负荷密切相关。通过Deform-3D模拟得到了铸钢基体堆焊模具连续工作状态下的温度分布规律。利用HDX-100数字式显微硬度计检测了该模具服役前后各层的硬度变化。结果表明,锻模连续工作时表层温度范围为550~650 ℃,服役前后硬度变化明显,最大降幅约为250 HV0.5;近表层温度范围为470~550 ℃,服役前后硬度降幅约为40 HV0.5;基体区连续工作时处于315 ℃左右恒温,对该区材料服役前后的硬度影响不大。 相似文献
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Changhyok Choi Adam Groseclose Taylan Altan 《Journal of Materials Processing Technology》2012,212(8):1742-1752
In warm forging, die life is affected by abrasive wear and plastic deformation and may be shortened considerably due to thermal softening of the die surface caused by forging temperature and pressure. In this study, a methodology is developed for estimating abrasive die wear and plastic deformation in a warm forging operation, using a tempering parameter. This methodology consists of: (a) determination of the steady state die temperatures using multiple FE simulations, (b) using the calculated temperatures to predict the plastic deformation of the dies, (c) measuring the surface profile of the worn dies using a Coordinate Measuring Machine (CMM), (d) identifying the wear profiles caused by abrasive wear and plastic deformation, and (e) determining the abrasive wear parameters that can be used for future estimation of die wear in warm forging. The predictions have been compared with experimental results and it was concluded that this method can be used for estimation of die failure (wear and plastic deformation) in hot/warm forging. 相似文献
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Bernd-Arno Behrens Jan Puppa Adis Huskic Kai Brunotte Anas Bouguecha Tobias Prüß 《Production Engineering》2016,10(6):599-606
The temperature of hot forging dies has a high influence on the wear of tool surfaces. In order to reduce the thermal impact on tool life, passively acting heat pipes are tested and the results are presented within this paper. For this purpose, the upper die of a commonly used hot forging tool was equipped with heat pipes and serial forging trials have been performed. The influence of the heat pipes on the die temperature as well as the effects on wear behavior are presented. The heat pipe cooling leads to a lower die temperature and thus to a reduction of adhesive wear. The wear is examined by optical and tactile measurements as well as by micrograph analyses. Conclusively, hardness tests of the tool edge layer are carried out. 相似文献
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Finite element analysis of die wear in hot forging processes 总被引:1,自引:0,他引:1
B.-A. Behrens 《CIRP Annals》2008,57(1):305-308
Design optimization of hot forging dies requires an accurate estimation of die wear. The presented paper introduces a finite element model for wear estimation that includes the process related thermal effects on hardness of the tool material. Fundamental investigations concerning the hardness evolution due to thermal softening of the tool material are presented. To obtain necessary data for model calibration by means of statistical analysis, optical measurements are performed on several industrial forging dies. The introduced model is proved to be applicable in wear estimation of hot forging dies over a large number of operating cycles. 相似文献
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根据齿轮精度检验的指标,提出了精度控制需要注意的问题,并针对每个问题提出解决办法。在系统分析热精锻和冷锻成形过程中齿形、齿面、弹性变形及模具寿命等问题的基础上,确定了热精锻-冷精整工艺流程,完成了精锻件及热精锻模的设计。对不同坯料尺寸和镦粗比的热精锻工艺过程进行了试验研究,分析了坯料和镦粗比对齿形充满的影响。研究结果表明,采用直径小于分锥角小端直径的坯料,选定镦粗比1.5进行热锻成形,锻造的热精锻齿轮齿形、齿顶充满效果较好,冷精整后的齿形饱满准确,在对氧化铁皮进行彻底清理后,锻件表面质量良好。 相似文献