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蜗杆珩磨轮珩齿工艺是八十年代中末期在国内兴起的热处理后精加工齿面工艺。对于中硬齿面的珩磨,已有几家工厂成功应用,但对于硬齿面的珩磨,特别是外径定心花键孔硬齿面齿轮的珩磨加工。还未曾见过介绍。我厂针对用户对齿轮精度要求日益提高的趋势,为寻求稳定加工,按GB10095—88规定的8级精度齿轮的高效、经济加工途径,选择蜗杆珩齿工艺对热处理后硬齿面加工。经过几年的实践,取得良好成效。 一、工艺流程 硬齿面齿轮材料多为20CrMnTi,渗碳淬火达到表面硬度HRC58~64。对于外径定心花键孔齿轮,且有拨叉槽的,如图1所示。由于其截面的变化较大,使孔变形也较大。虽采用稀土碳共渗、碳氮共渗、微氮中温渗碳及栏具定置保护等热处理手段,变形仍不可避免。 相似文献
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近年来一些工业发达国家在机械工业中已普遍使用硬齿面齿轮。我国的硬齿面齿轮也正在逐步推广。国外对精度较高(7级精度以上)的中模数(m2~6)硬齿面齿轮,通常是放在类似瑞士NZA型蜗杆形砂轮齿轮磨床上进行磨齿的。我国因此类磨床较少,故都采用滚齿→预剃齿→热处理→珩齿加工工艺。由于珩齿只能提高齿轮齿形的表面光洁度,不能提高齿轮精 相似文献
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针对目前包络环面蜗杆齿面磨削加工中存在的专用机床昂贵、操作繁琐复杂、加工效率低精度低等不足,提出一种基于通用机床的齿面以车代磨加工方法。应用微分几何和齿轮啮合原理,建立各种包络环面蜗杆齿面的统一数学模型。分析包络环面蜗杆齿面以车代磨的实现原理,研究NC程序的编制方案及齿厚控制、出入口修缘量、刀具宽度选取及精度控制等关键技术问题。以尼龙TI蜗杆为例,车削出蜗杆齿面,通过配对检测得出接触斑点与理论相符,表明加工方法正确可行。研究工作为实现硬齿面包络环面蜗杆齿面以车代磨奠定理论基础和初步试验探索。 相似文献
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针对变齿厚渐开线齿轮包络环面蜗杆齿面的变齿形、变齿厚、变齿距等复杂螺旋面特征,探究包络环面蜗杆齿面的精密铣削加工工艺,提出了包络环面蜗杆齿面误差拓扑图检测方法,分析了基于齿轮测量中心的环面蜗杆齿面检测与数据处理方法,并研制了环面蜗杆样件,进行了齿面精度检测.结果表明:蜗杆左齿面最大偏差为24.7 pm,平均偏差为12 μn;环面蜗杆右齿面最大偏差为17.2 μm,平均偏差为9.3 μm;蜗杆右侧齿面的精度高于左侧齿面.研究结果为后续传动副样机的传动精度和性能试验提供了试验支撑. 相似文献
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蜗杆砂轮磨是广泛应用于中小模数齿轮的批量精加工方法,但在实际加工过程中,蜗杆砂轮磨齿易在齿向形成规则的平行齿面纹理,从而增大了齿轮的啮合噪声。分析磨削过程中蜗杆砂轮与齿轮的接触特性,建立了啮合方程和接触点方程,阐述了接触迹构成整个齿面的机理;分析蜗杆砂轮磨齿的磨削特性,建立瞬时接触点的磨削速度和形状模型,计算磨粒在齿面上的磨削路径,分析磨削特性对齿面微观几何结构的影响,得到齿面的整体纹理模型;结合齿面纹理与噪声激励的关系,分析出齿面规则纹理对齿轮噪声的影响机理,提出按照正弦函数变化的冲程变速蜗杆砂轮磨齿加工方法;进行了蜗杆砂轮磨削常规加工与变冲程速度加工的对比试验,结果表明,该方法加工的齿面接触点位置具有一定的随机性,形成不规则的齿面纹理,不同转速下齿轮啮合噪声声压级总值减小约3.5 dB,已经达到改善齿面纹理的效果。 相似文献
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为了实现面齿轮磨齿加工,采用包络原理对面齿轮磨削蜗杆砂轮齿形进行设计,并对蜗杆砂轮的修整方法进行研究.建立了蜗杆砂轮齿面的包络坐标系;给出了蜗杆砂轮产形面方程;推导了蜗杆砂轮齿廓的曲面方程,利用Matlab软件对蜗杆砂轮齿廓进行了仿真,根据面齿轮磨削蜗杆砂轮的齿面生成原理,给出了修整工具的齿廓形状、齿宽限制以及修整工具... 相似文献
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小模数精密锥面包络圆柱蜗杆(ZK蜗杆)是一种非线性螺旋曲面蜗杆,传统的车削加工方法难以保证其加工精度,现多采用由锥形铣刀(或砂轮)包络而成的铣削加工方式。针对ZK蜗杆的特点,在分析影响ZK蜗杆传动性能的误差基础上,对铣削加工过程中如何控制齿形、齿厚、螺旋线误差和齿面粗糙度进行了阐述。结合生产实际经验,提出了行之有效的精度控制方法和检测措施,对提高ZK蜗杆以及同类型的蜗杆的设计水平和制造精度具有现实的指导意义。 相似文献
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In precision machining, the machining error from thermal distortion carries a high proportion of the total errors. If a precision
machining tool can transfer heat fast, the thermal distortion will be reduced and the machining precision will be improved.
A heat pipe working based on phase transitions of the inner working liquid transfers heat with high efficiency and is widely
applied in spaceflight and chemical industries. In mechanics, applications of heat pipes are correspondingly less. When a
heat pipe is applied to a hydrostatic motorized spindle, the thermal distortion cannot be solved during the heat transfer
process because thermal conductivity or equivalent thermal conductivity should be provided first for special application in
mechanics. An equivalent thermal conductivity model based on equivalent thermal resistances is established. Performance tests
for a screen wick pipe, gravity pipe, and rotation heat pipe are done to validate the efficiency of the equivalent thermal
conductivity model. The proposed model provides a calculation method for the thermal distortion analysis of heat pipes applied
in the motorized spindle. 相似文献
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附加径向运动方式的斜齿轮双面磨削方法具有小批量多品种加工的特性与机构可靠的优点,但在加工时会出现无法避免的齿面扭曲现象,导致加工齿面与理论齿面存在原理性误差,针对该现象对斜齿轮性能的影响进行了量化研究。以数值方法计算得到双面磨削方法的误差齿面模型,将该误差齿面与理论齿面进行对比,采用齿面接触分析方法(TCA)计算获得不同齿面下的传动误差和接触斑点。结果表明,齿形扭曲对左齿面性能影响较小,左齿面可基本实现理论修形效果,齿向扭曲现象导致右齿面性能发生了明显劣化;合适的修形方式与轴交角可以使左右齿面传动误差差异缩小在15%左右。 相似文献
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Modification design method for an enveloping hourglass worm gear with consideration of machining and misalignment errors 总被引:1,自引:0,他引:1
The influences of machining and misalignment errors play a very critical role in the performance of the anti-backlash double-roller enveloping hourglass worm gear(ADEHWG).However,a corresponding efficient method for eliminating or reducing these errors on the tooth profile of the ADEHWG is seldom reported.The gear engagement equation and tooth profile equation for considering six different errors that could arise from the machining and gear misalignment are derived from the theories of differential geometry and gear meshing.Also,the tooth contact analysis(TCA) is used to systematically investigate the influence of the machining and misalignment errors on the contact curves and the tooth profile by means of numerical analysis and three-dimensional solid modeling.The research results show that vertical angular misalignment of the worm wheel(Δβ) has the strongest influences while the tooth angle error(Δα) has the weakest influences on the contact curves and the tooth profile.A novel efficient approach is proposed and used to minimize the effect of the errors in manufacturing by changing the radius of the grinding wheel and the approaching point of contact.The results from the TCA and the experiment demonstrate that this tooth profile design modification method can indeed reduce the machining and misalignment errors.This modification design method is helpful in understanding the manufacturing technology of the ADEHWG. 相似文献
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High-accuracy gears are necessary to ensure the strength and silence of compact geared motors. Heat-treated surface-hardened small gears are employed in the reducer of a compact geared motor. The heat treatment causes distortion, which deteriorates the gear accuracy. To remove this distortion, surface-hardened small gears are rehobbed with a carbide hob. The rehobbing makes a tool mark on the gear tooth surface. This tool mark leads not only to strength deterioration of the tooth surface, but also vibration and noise. Therefore, a surface finishing method that eliminates the tool mark is required. However, it is difficult to finish surface-hardened small gears. This study proposes a tooth surface finishing method for a surface-hardened small gear. The method employs a gear-shaped tool composed of alumina-fiber-reinforced plastic (ALFRP) and a surface finishing device with an oscillation/traverse system. The proposed method was used in an experiment to remove the tool mark on the gear tooth flank of a surface-hardened small gear rehobbed by the carbide hob. The effectiveness of this method was verified. In addition, the processing mechanism of the ALFRP gearshaped tool was analyzed by observing the tool and the chips. 相似文献
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双导程ZN蜗杆修缘成形磨削研究 总被引:2,自引:0,他引:2
双导程ZN蜗杆(又称法向直廓蜗杆)修缘的精密加工需要研究一种成形磨削方法。传统的蜗杆修缘磨削方法是根据加工经验对砂轮进行手工修形,加工效率低且难以实现高精度的齿形修缘磨削。为此,以ZN蜗杆修缘齿形的成形磨削为目标,在蜗杆法平面引入齿形修缘分析,建立ZN蜗杆修缘齿形的数学模型,依据空间啮合原理计算出蜗杆磨削的成形砂轮截形,并利用数控砂轮修整装置修整砂轮。为验证蜗杆修缘的成形磨削效果,选用实际生产中的某一双导程ZN蜗杆,在自主研制的数控砂轮修整系统和工厂的蜗杆磨床上进行试验,经过对成形磨削砂轮计算、修整和蜗杆磨削,结果表明,磨削蜗杆的修缘量满足预期设计要求,蜗杆齿形精度达到6级。表明该方法可用于双导程ZN蜗杆修缘的高精度成形磨削。 相似文献