轴承套圈的淬火畸变

轴承套圈的淬火畸变有尺寸变化和几何形状变化两种类型。对SUJ2钢制6200型轴承套圈进行了试验,分析了轴承套圈的淬火畸变量,如膨胀量、椭圆度和圆柱度与套圈尺寸、淬火油温、残留奥氏体量、淬火冷却均匀性之间的关系,提出了改进措施。     

输送带式淬火时零件的畸变

对轴承热处理常用输送带式淬火炉淬火过程中及淬火后轴承零件的畸变进行了分析,讨论了影响轴承套圈畸变的因素及机理,提出了减小畸变的具体措施.     

输送带式淬火炉淬火时零件的畸变

对轴承热处理常用输送带式淬火炉淬火过程中及淬火后轴承零件的畸变进行了分析，讨论了影响轴承套圈畸变的因素及机理，提出了减小畸变的具体措施。     

网带炉淬火的轴承圈黑斑的消除

轴承是大批量生产的零件,其热处理主要是网带炉淬火随后低温回火,但网带炉淬火的轴承外观质量常常不稳定,最常见的是轴承圈淬火后表面产生黑斑,严重影响成品的质量。本文分析了轴承热处理后产生黑斑的原因,采取了多种措施消除了网带炉淬火的轴承表面的黑斑,积累了轴承网带炉热处理的宝贵经验。     

减小GCr15轴承套圈热处理变形的工艺研究

观察了采用铸链炉淬火热处理的GCr15钢轴承套圈淬火前后的金相组织，并观察了其锻造和球化退火后的组织，发现淬火前组织均匀，而淬火后的组织中存在部分屈氏体组织。考虑到生产成本，采用适当升高淬火加热温度、延长保温时间，同时采用压缩空气搅拌冷却淬火介质的方法处理套圈零件，并对比不同方案处理的套圈变形量，发现此方法可以在一定程度上降低套圈的热处理变形，且成本增加很少。     

汽车后桥螺旋伞齿轮热处理畸变的控制

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％。     

专利

专利名称：一种特大型轴承套圈的热处理方法 根据GCr15SiMn钢特大型轴承套圈的有效厚度,加热至800—830℃时,以每毫米有效厚度保温（0．7—1．0）min后,在ZHY-101淬火液中淬火,冷却至50-120％,出淬火液空冷至室温。     

PAG淬火剂冷却控制技术在网带炉生产线上的应用

通过对网带炉淬火油槽冷却系统的技术改进及PAG淬火剂的应用,以及对PAG淬火剂的浓度、温度、喷射、搅拌力度及角度等方面的调节与控制,并按工艺需要,对工件高中温段实施强烈淬火冷却控制,使产品达到"高温区快冷,低温区慢冷"的理想淬火冷却效果.由于采用强烈淬火控制技术,最大限度地强化了热交换,工件得到可控制的均匀快冷,使工件淬火冷却效果更强烈,硬度更高、更均匀.由于淬火后工件表面产生了压应力,有效地抑制了工件的畸变和开裂,使产品质量及产量得到了大幅度提高.     

淬火方式对GCr15SiMo钢制特大型轴承套圈淬硬层的影响

本文通过热处理工艺试验,研究油浴淬火和盐浴淬火对GCr15SiMo钢制特大型轴承套圈淬硬层的影响。结果表明,两种淬火方式加工的轴承套圈成品硬度均能满足技术要求;生产上可根据轴承套圈批量大小选用辊底式盐淬连续炉或井式油淬周期炉两种设备。     

冷处理对8Cr4Mo4V轴承钢尺寸稳定性的影响

通过对8Cr4Mo4V钢制备的轴承套圈进行不同时间的冷处理,对热处理不同阶段的组织进行观察,测定钢中的残留奥氏体,并测定了经不同阶段热处理后轴承套圈尺寸,研究了热处理对轴承套圈尺寸变化的影响。结果表明,淬火和回火使轴承套圈尺寸增大,冷处理使轴承套圈尺寸减小,残留奥氏体向马氏体的转变,使比容增大,尺寸增大,冷处理降低淬火应力,使马氏体发生分解,比容降低,尺寸减小。冷处理在促进残留奥氏体转变为马氏体的同时,也使铁原子晶格常数缩小,析出超微细碳化物,从而导致尺寸的降低。     

新能源汽车电机转轴条形槽的渗碳淬火畸变控制

某新能源汽车电机转轴条形槽热处理后的畸变无法满足尺寸精度要求,通过降低渗碳碳势、提高淬火油温度、优化淬火过程和20 μm锥度反畸变加工等措施,成功将电机转轴条形槽的畸变控制在尺寸要求范围内,且小批量生产时畸变程度未明显增加,表明此改进工艺可应用于批量生产。     

大型渗碳齿圈淬火畸变及控制

大型齿圈渗碳后淬火时会发生较大的畸变。通过合理的设计和机加工与热处理工艺的配合,采用正确的矫正方法及硝盐淬火,可以将渗碳、淬火的大型齿圈的椭圆畸变量控制在2 mm以内,翘曲量及锥度畸变量控制在1 mm以内,且提高了齿圈的承载能力和使用寿命。     

等温淬火油用于齿轮的淬火冷却

测定了HSFD型等温淬火油和N32机械油的件能指标和冷却特性曲线.通过两种用于齿轮淬火冷却的淬火介质的对比实验分析,讨论了淬火介质的冷却特性对齿轮性能和尺寸变化的影响.结果表明,HSFD型分级等温淬火油可以起到替代N32机械油的作用,并成功地用于齿轮生产,齿轮经热处理后.不仅组织结构、力学性能可以满足要求,而且可以减小齿轮变形.     

Vacuum Furnace - Integrated “Sub zero” Treatment

The vacuum heat treatment with overpressure gas quenching is more and more accepted due to considerable advantages compared to the traditional oil and salt hath protests. Continuous further developments and new concepts like multi-threclional cooling systems, a separate quenching chamber and “sub zero” systems lead towards an oxidation free and law distortion vacuum heat treatment for a broad range of part and materials. Short and energy saving processes guarantee a high economic efficiency and environmental compatibility.The “sub zero” system which is inlegrated into the standard vacuum fumace achieves a heat treatment result with a high conversion of retained austenite in fully automatic hardening and tempering processes.     

0Cr17Ni4Cu4Nb不锈钢底座的真空热处理

以0Cr17Ni4Cu4Nb不锈钢底座为研究对象,通过工艺试验方法获得了既满足力学性能要求又满足畸变量控制要求的真空固溶时效工艺。结果表明,采用1060 ℃×1.5 h固溶,油冷+460 ℃×4 h时效,空冷处理后的工件可达到技术要求,即抗拉强度≥1420 MPa,硬度≥42.5 HRC,安装面平面度≤0.5 mm。此外,在真空淬火炉中可通过调节淬火油温度,延长充气预冷时间等措施实现尺寸控制。     

Influence of Rewetting Behavior on the Distortion of Bearing Races

Immersion quenching in evaporable fluids like oil, polymer solutions, or water is a widely used technique in heat treatment shops because this technique provides higher heat transfer coefficients than the most alternative gas quenching techniques. The disadvantages of immersion quenching in evaporating fluids are the complex heat transfer mechanisms which consist of the three phases, film boiling, nucleate boiling, and convection. Especially the transition from film to nucleate boiling—the rewetting of the sample surface—is a complex process which leads to a strong position dependence of the heat transfer coefficient of the cooled work pieces. In particular, immersion quenching of thin-walled rings can result in large changes of ovality with comparable high scattering. To understand these results, two series of experiments were performed. Rings were quenched in oil in a special quenching tank and the rewetting behavior was documented. Furthermore, bearing races were quenched in a standard tank. Before and after heat treatment, these rings were measured by a coordinate measuring system and the distortion was determined. The investigations have clearly shown that the vapor film can have an important influence on distortion generation during oil quenching. The resulting distortion can principally be explained by the observed rewetting behavior.     

航空发动机16Ni3CrMoE钢制输出轴的热处理畸变控制

通过对航空发动机16Ni3CrMoE钢制输出轴渗碳淬火后出现轴向长度缩短、内花键畸变的原因进行分析与研究。结果表明,热处理畸变主要影响因素是零件在渗碳、淬火工序中产生的热应力和组织应力的综合作用,渗碳零件表面和心部的成分存在差异,使热处理过程中的应力分布变得更不均匀和复杂。通过改变渗碳装炉方式、降低渗碳冷却速度、静油等温淬火、渗碳前增加稳定化处理等工艺方法,将零件的热处理畸变控制在工艺要求范围内。     

An Advanced Oscillation Mixing Method for Improving the Cooling Uniformity in Quenching

In quenching, the cooling uniformity is most important to diminish distortion occurring on work pieces. As a trial to accomplish uniform cooling, therefore, there exist various mixing methods of a quenchant and the quenchant circulation with an external pump has so far been the well accepted mixing method. However, this study proposes an advanced oscillation mixing method that can improve more the cooling uniformity in quenching. The proposed method includes a stirrer in oscillating motion, so that the simultaneous oscillating and mixing movements of the stirrer are considered to provide efecfively the uniform cooling characteristics for the quenchant. In comparison with the case of the circulation pump mixing, the investigation using the oscillation mixing method has demonstrated the following two experimental facts:(1) the short vapor blanket stage caused by the quick breakage of the oil vapor blanket and (2) the reduced variation of the quenching distortion.