共查询到19条相似文献,搜索用时 126 毫秒
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渗碳淬火是高参数硬齿面齿轮表面强化热处理的主要工艺方法。该工艺过程复杂,影响因素较多,尤其是该过程中齿轮畸变的控制是其突出的技术难点之一。鉴于传统方法的缺陷和计算机模拟技术的发展,对齿轮渗碳淬火过程及其畸变的数值模拟成为当前行业的发展前沿。本文阐述了齿轮渗碳淬火及其畸变数值模拟的数学模型、操作平台和研究现状,并展望了今后的发展方向。 相似文献
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采用单因素方差分析方法对齿轮热处理畸变的规律与影响因素进行了分析。讨论了炉组、齿轮型号和材料等因素对重载齿轮的齿轮孔径、键槽宽度的变化规律和齿轮轴的径向圆跳动、齿轮节圆的圆跳动规律的影响。通过统计分析可知,对重载齿轮而言,不同炉组对齿轮热处理畸变规律影响不大,在工艺实施时应注意保持规范化与一致性;齿轮型号对个别齿轮的形状改变规律影响较大,应考虑对它们进行结构优化;材料因素对齿轮热处理畸变规律影响较严重,齿轮选材时应注意性能满足前提下不过高追求钢种的强度级别。研究结果同时说明,方差分析是一种分析齿轮的热处理畸变规律的有效方法。 相似文献
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汽车变速器齿轮有很多内花键,热处理时会发生畸变,影响齿轮的精度等级和装配。产生热处理畸变的原因很多,如产品结构、材料、锻造、机加工工艺和热处理工艺等。为了减小花键的热处理畸变,必须对各道加工工序进行全面的质量管理和控制,分析不合格品的原因并制订对策。本文按加工工艺路线分析花键齿轮产生热处理畸变的原因,找出影响质量的因素,有效控制畸变量,确保其尺寸精度。 相似文献
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通过金相检验、化学分析、硬度检测等手段对主动齿轮热处理畸变与断裂原因进行了分析。结果表明,主动齿轮材料中带状组织严重偏析、淬火温度偏高及工装夹具畸变大等是导致齿轮畸变与断裂的主要原因。经严把材料关,采用合适的校直方法,获得了满意的校直效果。 相似文献
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渗碳齿轮的热处理畸变及其控制技术 总被引:2,自引:0,他引:2
探讨了渗碳淬火齿轮热处理畸变的规律,分析了影响渗碳淬火齿轮热处理畸变的影响因素,介绍了控制渗碳淬火齿轮热处理畸变的技术,并列举了控制齿轮热处理畸变的实例。 相似文献
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阎承沛 《热处理技术与装备》2002,23(2):1-5
论述了我国齿轮热处理技术的现状,重点阐述齿轮受力状况及技术要求,齿轮材料与加工成形,齿轮热处理工艺研究进展,齿轮热处理缺陷及技术改进,齿轮热处理新工艺技术开发以及齿轮热处理设备的研制开发等。同时,对我国齿轮热处理技术的发展趋势进行了初步探讨。 相似文献
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阎承沛 《热处理技术与装备》2002,23(3):1-5
论述了我国齿轮热处理技术的现状,重点阐述齿轮受力状况及技术要求,齿轮材料与加工成形,齿轮热处理工艺研究进展,齿轮热处理缺陷及技术改进,齿轮热处理新工艺技术开发以及齿轮热处理设备的研制开发等。同时,对我国齿轮热处理技术的发展趋势进行了初步探讨。 相似文献
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G. Hiller 《International Heat Treatment & Surface Engineering》2014,8(1):35-41
AbstractOver the last decade, vacuum carburising in combination with high pressure gas quenching (HPGQ) has become a preferred technology in gear industry mainly in Europe and North America. Driven by cost savings in manufacturing of gears and shafts, the heat treatment process has gone into the focus of the manufacturers. The potential of savings in heat treatment is huge because the new technology allows the integration into the manufacturing chain of gears and shafts. With vacuum heat treatment furnaces is it possible to implement this integration into manufacturing. The advantages of vacuum technology are in particular: the absence of surface oxidation, the cold wall technology, the gas quenching technology, the reduced logistics, flexible reaction on the needs of production and the control of distortion. In parallel to the development of the new heat treat process, a second point came into the focus of manufacturers: the choice of material. The industry recognised that by choosing a slightly higher alloyed material, significant savings in the entire manufacturing chain can be realised: smaller grinding stock, faster carburising cycles, gas quenching with control of distortion, and ultimately the reduction/elimination of grinding- and straightening operations. Vacuum furnaces are flexible in their reaction to the production requirements. Only with these types of heat treatment furnaces is it possible to switch them off after use and save immediately energy and costs. This benefit was essential for the industry in 2008/09 during the world economic crisis. In the past, the automotive industry in Europe and North America mostly ran on conventional pusher type furnaces which must be kept on operating temperature even if only 50% of installed production capacity is needed. The vacuum furnace of type ModulTherm is a multi-chamber system and each chamber can be switched On or Off according to the production plan which finally saves a huge amount of cost for energy. This paper presents the advantages of the vacuum carburising technology with high pressure gas quenching. The author will demonstrate with examples and comparisons the benefits of vacuum technology and the successfully integration of heat treatment in the manufacturing chain. 相似文献
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齿轮在渗碳淬火中会产生变形,直接影响齿轮的精度,增大噪音,甚至造成偏载。在确保齿轮力学性能的前提下,不改变热处理工艺,采用合适的装夹和选择合理的淬火介质,解决了经渗碳淬火的巴西依顿5125282齿轮齿形、齿向的变形问题。 相似文献
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姚继洪 《热处理技术与装备》2006,27(2):4-10,28
加热和淬火是齿轮加工中最关键的操作工序,经此处理后将赋予齿轮以满足抵抗高接触应力要求的机械性能和耐磨性能并具备高的使用寿命.但遗憾的是,在齿轮的制造中,热处理和淬火通常是被了解得最少的.由于热处理后的工件通常会产生变形并使工件失去光泽,往往会成为后续加工工艺的"瓶颈"而备受责难.本文之目的意在分析引起齿轮热处理和淬火变形的原因,并提出一些对性能进行调整的方法以便在淬火时得到合适的变形和高残余应力状态. 相似文献
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汽车后桥螺旋伞齿轮热处理畸变的控制 总被引:2,自引:0,他引:2
某汽车后桥螺旋伞齿轮经渗碳淬火后畸变量较大,一次合格率较低。为此从齿轮的设计、原材料、热处理工艺3方面分析了齿轮热处理畸变的原因,并采取了下列措施:控制原材料组织,采用正确的预备热处理工艺(正火),提高淬火冷却均匀性,淬火后及时回火,采用合理的吊具等,结果大大减小了齿轮的热处理畸变,其一次合格率从50%~70%提高到了95%~98%。 相似文献
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G. Busch 《International Heat Treatment & Surface Engineering》2014,8(1):29-34
AbstractThe traditional technology of heat treatment for gear components is the combination of atmospheric gas carburising with oil quenching. This technology is proven to deliver reliable results. However, the need of modern production is to react fast according to changing processes and production volumes. The highest technical requirements in combination with economical production methods must be met to ensure the highest quality standards and to establish environmental friendly production. Low pressure carburising and high pressure gas quenching is a reliable method that is used more and more in Asia, Europe and North America. This technology is an answer to the above described needs. Major car and gear makers have proven this process and implemented it into the mass production of gears components. With low pressure carburising and high pressure gas quenching it is possible to have real high production volumes and to react very flexible to different production scenarios. 相似文献
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在生产中,齿轮和齿轮轴的渗碳和淬火畸变是难以避免的,减小其畸变量是一个技术难题.然而,大量的实测数据表明,齿轮和齿轮轴的渗碳和淬火畸变是有规律的,如果冷热加工工艺合理,这种畸变量可以控制在要求的范围内. 相似文献
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热处理畸变之所以成为齿轮生产中的最大难题,乃是因为影响畸变的因素太多且复杂,并在整个齿轮生产中的每个环节,甚至每一次操作都会产生潜在的畸变因素。面对如此多而复杂的影响因素,本文采用"微观分析-宏观控制"的理念及"质量平衡-相变趋近"和"传热均匀-减小温差"的原则来讨论齿轮热处理畸变的机制和影响因素,并探寻相应的控制畸变途径,最后就齿轮生产中如何控制热处理畸变提出了一些参考意见。 相似文献