共查询到19条相似文献,搜索用时 655 毫秒
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汽车差速器锥齿轮的温锻制坯/冷摆辗成形加工技术研究 总被引:5,自引:0,他引:5
为提高差速器锥齿轮的齿部强度和静啮合特性,达到少无切削加工及大批量生产的目的,采用温锻制坯、锻件余热退火与冷摆辗成形相结合的精密成形工艺生产差速器锥齿轮精锻件;对变形程度的分配、成形工艺参数的选择、高精度冷摆辗模具的设计与加工等关键技术问题进行了分析。结果表明,采用该工艺生产的差速器锥齿轮精锻件,较好地解决了差速器锥齿轮制造过程中存在的齿轮精度差、齿部强度低、模具寿命低、设备投资大等问题,为提高差速器锥齿轮的国产化率、减轻差速器的重量进而减轻汽车的自重等奠定了技术基础。 相似文献
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本文介绍了摩托车磁电机轮套的冷摆辗精密成形工艺,讨论了坯料形状尺寸及摆辗工艺参数对轮套冷摆辗成形的影响,分析了冷摆辗成形件缺陷的产生原因,并提出防止措施。 相似文献
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论述半轴锥齿轮精密锻造生产技术。介绍其工艺设计与计算、锻造力计算、设备选型及半轴锥齿轮的后续加工。实践表明,热锻成形、冷锻精整工艺是精锻半轴锥齿轮的较佳工艺。 相似文献
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齿轮类零件的冷摆辗成形及摆辗压力机 总被引:1,自引:0,他引:1
本文介绍了摆动辗压成形新工艺的基本原理,以及齿形零件的冷摆辗成形、设备和理论的研究概况,并以较多篇幅阐述了端面齿轮、伞齿轮等零件的冷摆辗精密成形,指明了用压力加工方法(特别是冷摆辗新工艺)加工精密齿形、节能节材是国内外的一种发展趋势。 相似文献
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本文以金属塑性成形原理为基础,研究了摆动碾压技术在半轴生产领域的应用,介绍了摆动碾压工艺的运动学原理。并通过有限元方法对半轴摆辗成形过程进行模拟分析,选取了合适的摆辗参数,通过改变摆辗进给速度,得出了在不同情况下半轴的成形情况及其变化规律。结合摆辗中的金属流动情况和应力分布情况,初步预测可能出现的锻件缺陷。将不同方案的成形过程和结果进行对比分析,选择出了摆辗成形效果较好的进给速度。 相似文献
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本文以汽车半轴的摆辗成形工艺为研究对象,探究了摆辗工艺在半轴生产领域的应用情况,介绍了摆辗工艺的成形原理和成形特点。并设计了两种半轴坯料方案,确定三种不同的进给速度作为工艺优化的参数,使用有限元方法对不同参数下的成形情况进行了数值模拟,通过深入分析各组数据,研究金属流动情况和锻件质量,有效预测锻件缺陷,最后在所有方案中选取了最优的工艺参数,完成了方案对比和工艺优化。 相似文献
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钢在冷摆辗成形时的变形抗力较大,模具工作部分将产生很大的应力并受到剧烈的摩擦,所以它应具有高的强度、硬度、韧度和耐磨性。为了保持摆辗模具工作部分的尺寸精度且不发生塑性变形。摆辗模具材料应有足够高的屈服强度。在一般情况下,硬度与抗压屈服强度之间具有接近正比的关 相似文献
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T. S. Yang N. C. Hwang S. Y. Chang 《Journal of Mechanical Science and Technology》2007,21(10):1566-1572
The manufacture of gears by applying hot or cold bulk forming processes is a quite widespread production method due to its
well-known basic advantages such as material and time cost reduction and the increased strength of the teeth. However, the
associated process planning and tool design are more complicated. In the precision forging of gears, the workpiece volume,
the die design, the power requirement and careful processing are more critical than traditional forging technology. For complete
filling up, predicting the power requirement is an important feature of the near net-shape forging process. In this paper,
a finite element analysis is utilized to investigate the material properties such as yielding stress, strength coefficient
and strain hardening exponent effects on forming load and maximum effective stress. The adductive network was then applied
to synthesize the data set obtained from the numerical simulation. The predicted results of the maximum forging load and maximum
equivalent stress of bevel gear forging from the prediction model are consistent with the results obtained from FEM simulation
quite well. After employing the prediction model one can provide valuable references in prediction of the maximum forging
load and maximum equivalent stress of bevel gear forging under a suitable range of material parameters. 相似文献
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随着汽车生产的大规模化,高效率、高质量、低污染、低成本的齿轮冷挤压制造技术越来越受到国内外学者和专家的关注,有限元分析和上限法等理论依据越来越多地被应用到齿轮冷挤压成形的工艺改进,闭式冷精锻和分流冷挤压成为直锥齿轮和圆柱直齿轮大批量生产的关键工艺。从理论研究和工艺研究两方面论述了汽车齿轮的冷挤压成形技术研究现状,并对其发展进行了讨论。 相似文献
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In the manufacture of straight bevel gears, a precision forging method has been mainly used in recent years and the precision forging die has been usually manufactured using electric discharge machining. However, it is difficult to content the high productivity and low manufacturing cost using electric discharge machining because the gears are produced through a process of several steps. In this article, a design and manufacture of a straight bevel gear for a precision forging die by direct milling is developed in order to improve the productivity and manufacturing cost for the gear production. The tooth profile of a straight bevel gear generated by a quasi-complementary crown gear instead of a usual complementary crown gear is introduced. For this study, first the numerical coordinates on the tooth surface of the straight bevel gear were calculated and the tooth profiles were modeled using a 3D-CAD system. Afterward, the direct milling of the precision forging die of the straight bevel gear in the hardened state was carried out using a CNC milling machine based on a CAM process through the calculated numerical coordinates. 相似文献
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锥齿轮冷挤压成形加工数值模拟研究 总被引:1,自引:0,他引:1
为了解决人工设计锥齿轮冷挤压模具过度依赖经验的问题,将数值模拟应用到锥齿轮模具设计中。设计了一套用于冷挤压加工锥齿轮的三层组合凹模,制定了相应的工艺措施,利用Deform-3D软件对锥齿轮的冷挤压加工过程进行了数值模拟,分析了加工过程中的载荷曲线、速度场、应力场和温度场,获得了有关锥齿轮变形规律的基本情况。研究结果表明,通过改善润滑条件、优化模具几何参数可以提高冷挤压加工锥齿轮的成形质量,并对锥齿轮冷挤压加工工艺流程定制、模具设计具有一定的指导意义。 相似文献
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李晨 《机械制造与自动化》2004,33(6):48-50
阐述了直齿锥齿轮热精锻生产技术的现状,并就热精锻齿轮的品质和市场问题,提出了汽车直齿锥齿轮冷挤锻生产的必要性;介绍了工厂改造设计中采用的闭式冷挤锻生产工艺和生产设备、改造设计后的产品品质和经济效果,以及采用闭式冷挤锻工艺进行大批量生产所存在的问题和解决途径。 相似文献
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螺旋锥齿轮精密模锻近净成形技术及制造工艺 总被引:4,自引:0,他引:4
采用先进近净成形技术的设计理念,探讨了螺旋锥齿轮齿面新的成形技术及其闭式、闭塞式精密热锻模具设计方法,并对汽车驱动桥螺旋锥齿轮采用精密模锻近净成形后的机械加工提出了一套新的工艺规程和加工方法.实践证明:该技术不仅可以提高锥齿轮的加工效率和材料利用率,而且还能提高锥齿轮的传动性能. 相似文献
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Sung-Yuen Jung Myung-Chang Kang Chul Kim Chang-Ho Kim Young-June Chang Seungr-Moo Han 《The International Journal of Advanced Manufacturing Technology》2009,41(7-8):684-693
Much research has been carried out in the manufacturing of helical gears by cold forging or by extrusion. Although cold forging is applied to some bevel, spur, and helical gears, problems in connection with the reduction forming load and tool life still make it difficult for these methods to be commercialized. In this study, focusing on reducing a load in forming helical gears, the extrusion of helical gears by two-step process is proposed. This process is composed primarily of extruding a billet to a spur gear and then twisting the previous spur gear extruded to a helical gear. Cylindrical billets of Cr-Mo steel(SCM 415) and aluminium alloy(Al60 series) were used as specimen materials for the experiments. The maximum loads obtained by upper-bound analysis and FEM are compared with the results of experiments. The loads of the analysis have good agreements with those of the experiment. The newly proposed method can be used as an advanced technique that remarkably reduces the forming load and replaces the conventional forming. 相似文献