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基于热力耦合的减振轴套挤压成形有限元模拟研究 总被引:1,自引:0,他引:1
利用基于有限变形理论的热力耦合基本方程,对减振轴套挤压成形模进行了三维热力耦合计算.分析发现应力集中明显,且其部位与模具实际裂纹位置相吻合.为改善模具体内应力分布,对该模具的主要结构参数进行了优化设计.获得优化的结构尺寸,使最大应力下降153%,从而延长了模具的使用寿命. 相似文献
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容差值是模具应力分析的一个重要参数,决定着模具应力分析数值模拟的精确程度,利用模拟软件DEFORM-3D对不同容差值下冷挤压模具进行的模具应力分析,得到模具应力分布规律,并通过对比分析,阐述容差值对模具应力分析的影响,确定冷挤压模具应力分析数值模拟合理的容差值选取规律。结果表明,随着容差值的增大,应力分析的精度与计算时间也随之增大,当容差值增大到一定值后,分析精度随之平稳,不再随之变化。分析表明,较为合理的容差值应介于模具网格划分的最大/最小尺寸值之间,此时应力分析兼具精度与效率。 相似文献
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本文借助大型有限元工程软件ANSYS对某款薄壁注塑模具进行应力、应变分析和尺寸优化。首先将模具整体几何模型导入到ANSYS中,然后,考虑模具的实际工作载荷和边界约束对其施加位移和压力边界条件,以模拟其真实的注塑环境,并对整个模具进行网格剖分和应力、应变分析。最后,尺寸优化设计为模具改进提出了参考方案。 相似文献
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本文借助大型有限元工程软件ANSYS对某款薄壁注塑模具进行应力,应变分析和尺寸优化.首先将模具整体几何模型导入到ANSYS中,然后,考虑模具的实际工作载荷和边界约束对其施加位移和压力边界条件,以模拟其真实的注塑环境,并对整个模具进行网格剖分和应力、应变分析.最后,尺寸优化设计为模具改进提出了参考方案. 相似文献
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《机械传动》2013,(12):31-34
模具寿命是影响弧齿锥齿轮锻造成本的主要因素之一。采用弹塑性有限元模型,对弧齿锥齿轮热锻成形的模具应力分布进行了模拟仿真,基于局部应力应变法,从模具的预热温度、齿模齿顶的过渡圆弧半径以及锻造成形速度等工艺因素计算模具的应力应变分布,分析各工艺因素对模具寿命的影响规律。模拟结果表明,热锻成形的弧齿锥齿轮的模具失效形式,主要为齿模的齿顶和齿根处应力集中引起的断裂。对于齿模的齿顶位置来说,三种工艺参数的变化与齿模疲劳寿命成正比。对于齿模的齿根位置来说,工艺参数的变化与模具寿命成反比。提出的模具寿命预测方法为批量化生产中优化模具结构和预测模具寿命提供了技术参考。 相似文献
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S. S. Akhtar A. F. M. Arif Bekir Sami Yilbas 《The International Journal of Advanced Manufacturing Technology》2010,47(5-8):687-698
Gas nitriding under controlled nitriding potential represents one of the important factors in enhancing the service life of dies used in the industry for hot aluminum extrusion. In the present study, AISI H13, a typical material used for hot extrusion dies, is gas nitrided using automated two-stage controlled nitriding process. Prior heat treatment on the material was carried out under the same controlled environment as used for hot extrusion dies to avoid any decarburization. The nitrided layer has been characterized using different techniques including optical microscopy, SEM, XRD, EDS, and microhardness analysis. It was found that controlled nitriding with in-process variation of nitriding potential can efficiently be used to control the morphology of compound layer and diffusion zone, effective case depth, case hardness, and quality of nitrided layer at sharp edges for better die performance. All the results were found in close agreement with established specifications required for improved die performance. 相似文献
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预应力挤压凹模内压有效作用区对模具设计影响的有限元分析 总被引:2,自引:0,他引:2
使用三维20节点等参元对受局部内压的预应力挤压四模进行了应力分析,得到了凹模内危险区的应力随内压有效作用区变化而变化的规律。结果表明,在挤压模具设计中通过改进结构设计和成形方式,使模具上具有合理的分布载荷是相当重要的。 相似文献
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静液挤压时,如凹模的型线不同,变形区的应力和流动状态是不同的。目前,静液挤压时,广泛采用圆锥模,但在挤压脆性金属时,产品经常会出现缺陷。为了研究产生缺陷的原因,应用弹塑性有限元法计算和分析了等应变型线模、余弦型线模、最短流线模、椭圆型线模及圆锥模等五种不同型线凹模在静液挤压时的应力和应变状态。结果表明,等应变型线凹模挤压时的应力和应变分布最为均匀,挤压力和塑变区内的拉应力最小,适用于挤压脆性金属。计算结果与实验比较,符合很好。计算结果对设计挤压凹模有很大的参考价值。 相似文献
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Sialon陶瓷热挤压模的应用研究 总被引:5,自引:0,他引:5
用Sialon陶瓷取代3Cr2W8V钢进行热挤压模的应用试验,取得良好效果,并对与应用相关的陶瓷材料抗热震性和磨损性能进行了研究。 相似文献
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Su-Hai Hsiang Jer-Liang Kuo 《The International Journal of Advanced Manufacturing Technology》2005,26(9-10):970-977
This study establishes the database concerning magnesium alloy hot extrusion, and uses it to conduct various investigations. Firstly, artificial neural networks (ANN) analysis is used to determine the die shapes of various extrusion ratios. Secondly, the process parameters for the hot extrusion of magnesium alloy are determined, and thirdly, the tensile strength and maximum extrusion load of the finished product are predicted. The database includes 11 parameters, associated with 108 sets of experiment, determined by material type (AZ31 and AZ61), extrusion ratio (14.41, 35.9 and 55.85), product shape (tubular and sheet), semicone angle of the die (90° and 30°), extrusion speed, temperature to which the billet is heated, temperature to which the container is heated, lubricant, hold-time at a specified temperature, extrusion load and tensile strength. ANN is applied to learn from this database, and backward propagation analysis is conducted to find the mechanical properties of the products under various extrusion ratios. This study adopts the orthogonal array of the Taguchi method to hot extrusion experiments that involve dies with different extrusion ratios, and sets the tensile strength and extrusion load of the finished product as the quality characteristics, to acquire the optimal parameter condition. Then, based on the results obtained from the additive model, confirmatory experiments are performed. An Analysis of Variance (ANOVA) analysis is then performed to investigate and analyze the influence of factors on the hot extrusion process. The weight of important factors in the database is increased, and subsequently, the forming load and mechanical properties of magnesium alloy under extrusion are accurately predicted. 相似文献
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A physically-based friction model is developed based on the ball-on-disc test results. The model is verified by using double action extrusion tests. Good agreements between the FE predictions and experiments have been obtained, in terms of the extrudate length and steady-state extrusion load, indicating that ball-on-disc test is an effect way of characterizing the friction for the bearing channel of hot extrusion dies. The nature of friction in the bearing channel can be summarized as a pressure dependant process: formation of isolated adhesive junctions, adhesive junctions growth and coalescence of adhesive junctions. 相似文献
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通过对9SiCr超长芯轴淬火工艺及校正方法的试验研究,总结出三硝冷却和热压校正是减少芯轴淬火变形开裂的最佳热处理工艺方案,在冷挤压模具的淬火和校正方面进行了一次成功的尝试,对冷挤压模具的淬火和校正积累了经验。 相似文献
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