剃齿刀重磨后齿高和齿厚的测量

随着渐开线圆柱齿轮精度标准JB179—83的贯彻实施,对剃齿刀的精度要求也相应严格,为了合理剃出被剃齿轮齿面的有效工作面高度,剃齿刀重磨后的齿高和齿厚的尺寸也必须保证一定的对应关系。     

径向剃齿刀在机修磨原理解析计算

径向剃齿是一种高效的齿轮精加工方法,但径向剃齿刀的修磨比较困难。径向剃齿刀在机修磨法是一种新的修形方法,其原理为:用一个与所剃齿轮几何参数完全一致,制造精度较高,齿面镀有金刚石磨粒层的修磨轮,装在径向剃齿机上,取代工序加工中的工件齿轮,与径向剃齿刀啮合,达到修形的目的。运用啮合理论,建立了剃齿刀修形解析模型,推导出了修形时的啮合方程及修形后剃齿刀的齿面方程,并进行了实例分析和计算机运算。试验证明,剃齿刀在机修磨法是一种实用的剃齿刀修形方法。     

剃齿刀在重磨中的计算

<正> 盘形剃齿刀由于具有一系列的特点,因此在齿轮齿形的精加工中应用广泛。剃齿后的齿轮齿形精度和光洁度基本上决定了齿轮齿形的成品精度和光洁度。虽然,有的齿轮经热处理后还采用珩齿工艺,但珩齿后的齿形精度仍主要取决于齿轮热处理前剃齿精度和热处理后的齿形变形程度。因此,剃齿后的齿轮质量直接影响着齿轮的成品质量,也影响着齿轮的使用寿命。要想加工出高质量的齿轮齿形,不仅要求我们设计制造出高质量的剃齿刀,而且必须保证剃齿刀在每次经重磨后仍保持应有的齿形尺寸精度和光洁度,当剃齿刀需做齿形修正时,还须保证齿形修正曲线的尺寸精度以及对     

渐开线盘形剃齿刀齿面修形位置的计算

利用计算确定剃齿刀齿面修形位置可以减少试验次数。通过对剃民齿面修形位置计算表明：（１）新，旧剃齿刀齿面修形位置到齿顶的基圆展开板长近相等，也就是说剃齿刀重磨后的修形位置不必重新计算；（２）用同一把剃齿刀剃削不同齿数的齿轮，剃齿刀的修形位置到面的基圆展开弧长近似相等，也不必按被剃齿轮齿数分档对剃民齿面修形。     

确定盘形剃齿刀重磨尺寸的新方法

用盘形剃齿刀剃削齿轮时,需要进行一系列的校验计算,只有在满足这些校验条件的前题下,剃齿刀才能正确加工齿轮。剃齿刀用钝后,要沿其渐开线齿测表面进行刃磨;与此同时,其外径也要按齿厚磨去量的大小相应磨小。通常,用重磨后的剃齿刀加     

用于切削大模数齿轮的新型“剃滚刀”的研究

用齿轮形的剃齿刀来剃削齿轮,使滚齿后的粗糙齿面得到光整,从而得到正确的齿形,这种方法已被广泛地采用。然而,在齿轮形剃齿刀的制造过程中,要得到正确的渐开线齿形是困难的,而且由于它需要重磨,要保证重磨后的齿形精变也是困难的。因此,作者创造了新型的“剃滚刀”,它的刀刃是通过剪切来切削齿面的。作者明确地说这种刀具的制造是很容易的。并己将把这种“剃滚刀”投入了实际使用,结果表明:滚齿后的精度大大提高。作者还报导了这种“剃滚刀”的研究、设计、制造及有关实际使用中得到的详细情况。     

靠模修形剃齿刀克服剃齿中凹

广泛使用的剃齿工艺存在着一个关键问题,剃后齿形中凹。它影响齿轮接触精度和噪声特性,对提高产品质量不利,阻碍了这项工艺的使用前景。两年来,我厂采用靠模法对剃齿刀进行修形后剃齿,克服了中凹,提高了接触精度,使齿轮噪声平均降低了5dB,音质柔和。剃齿刀修形量是根据标准剃刀剃齿后,产生齿形误差的数值和分布形状来确定的。再根据修形量来设计专用靠模板使砂轮成形,修磨剃齿刀,靠模     

剃齿工艺的现状及其与磨齿工艺的比较

分析了磨齿加工与剃齿加工各自的优势,比较了两种齿轮加工工艺的难度和成本;介绍了新一代的剃齿刀重磨机床的特点、剃齿的效果以及特殊的剃齿方法。     

剃齿刀的磨损和重磨

本文首先介紹影响剃齿刀耐用度的因素(如被加工齿輪和剃齿刀的材料,切削条件等),而后并着重說明了剃齿刀齿形修正曲綫对被剃齿輪齿形誤差的影响关系。作者認为可以按照被剃齿輪的精度要求和剃齿过程中工件齿形誤差的变化規律,求得能够加工出数量較多的合格齿輪的剃齿刀修正曲线。最后介紹确定剃齿刀重磨时期的方法,重磨方法以及典型的刃磨机床等。     

负变位剃齿刀设计原理及法向啮合角的计算

剃齿是齿轮的加工工序,剃齿精度是剃齿加工的首要问题。用标准剃齿刀剃齿时,常产生被剃齿轮齿形中凹现象,即剃后齿轮的渐开线齿形部中间凹下,下凹深度可达0．03～0．04mm。而采用负变位剃齿刀剃齿时,剃后齿轮的齿形中凹量只有0．01～0．02mm。那么为什么负变位剃齿刀能如此显著的提高剃齿精度？它又是如何设计的呢。本文在深入分析剃齿过程及误差形成机理的基础上,依据平衡剃齿原理提出了负变位剃齿刀的设计和计算方法,较好的解答了上述问题。     

Surface durability of shaved gears

Gears have become very vital positive transmission elements, finding numerous applications in small, medium and large machinery. With increasing demands for high strength materials for numerous applications, designers have found it necessary to develop new techniques to enhance the life of gears made of even low strength materials. Addendum correction, processing techniques and surface treatments are some of the techniques used for the above purpose. One of the faster and most economical of the above methods is gear shaving. Sufficient data on the performance characteristics of shaved gears are not available. The present paper highlights the performance characteristics of shaved gears, so far unpublished, from tests conducted on Forschungsstelle für Zahnräder und Getriebe apparatus. Scanning electron micrographs indicate that the pitting of shaved gears is occurring around oxides and other inclusions and is accompanied by delamination.Spectral analysis of the gear flanks shows that, apart from pitting, the entire wear profile follows the fatigue process.     

摆线齿锥齿轮加工中相关检验新方法

摆线齿锥齿轮可通过硬齿面刮削消除热处理变形,具有加工效率高、模数大、齿面硬的特点,所以非常适用于大型煤矿、冶金、运输等重型机械设备,针对大型摆线齿锥齿轮的生产实际提出并阐述了以更加直观和准确的实体建模方式对可能发生的刀盘干涉、齿面刮伤、槽底留埂、小齿轮根切或齿顶变尖进行检验.     

硬齿面双圆弧齿轮性能试验研究

根据刮削硬齿面双圆弧齿轮和磨削硬齿面渐开线齿轮接触疲劳、负载性能等方面的台架对比试验情况,对刮削精加工的渗碳淬火硬齿面双圆弧齿轮承载能力、使用寿命、传动品质、制造成本等进行了探讨.     

Initial wear of gears

Running-in experiments have been made in a back-to-back gear test rig with hobbed and shaved gears of quenched and tempered steels at different steels at different speeds and loads. Measurements of surface roughness and examinations of surface replicas were used to study the running-in process. The present results show that the running-in period corresponds to less than about 0.3×10⁶ revolutions. The initial wear is rather small but increases with running speed and applied load     

加工鼓形齿时径向剃齿刀修形量计算及应用结果分析

根据径向剃齿刀与被剃齿轮间存在的--对应关系,用抛物线近似表示被剃齿轮的齿向鼓形量,得到加工鼓形齿轮的径向剃齿刀的最终齿向修形量.由该修形量设计的径向剃齿刀可加工出鼓形齿轮.将其用于摩托车传动系统,可使摩托车达到降低行驶噪声、减少生产成本的显著效果.     

COMMON DEFINITION FOR END-SURFACE CONTACT RATIO OF GEARS AND ITS APPLICATIONS

Common definition and calculating expressions of end-surface contact ratio for all type of gears are put forward, and with calculation expressions for involute gears, micro-segments profile gears, and sine-curved profile gears being discussed. The end-surface contact ratio of gears is defined as the ratio of the action angle (the rotation angle of gear from gear-in to gear-out for one pair of teeth) to the rotation angle per pitch (or central angle per tooth). According to the theory of gearing, equation of the meshing line can be deduced from the tooth profiles of basic rack. Having obtained the equation of the meshing line, and being given the addendum outline of the gears, the contact ratio can be calculated with the calculation expressions. For the involute gears, this definition has same effect as the well-known definition: ratio of the contact line to the base pitch. This definition of contact ratio is also suitable to other non-involute gears, such as micro-segments profile gears, sine-curved prof     

Low-loss austempered ductile iron gears: Experimental evaluation comparing materials and lubricants

An experimental study to evaluate the power dissipation of gears was performed.Three low-loss gear models were manufactured using standard 20° pressure angle tools. Austempered ductile iron (ADI) and 20MnCr5 carburized steel gears were tested in an FZG gear test machine using mineral, ester and polyalphaolephine (PAO)-based oils.The results compare power dissipation, the influence of different tooth flank geometries, materials and lubricants.This work concludes that conventional power-transmission gears can be replaced by these improved and more efficient low-loss models, which can be produced using common tools and that steel gears can be successfully replaced by austempered ductile iron gears.     

小型开式齿轮的脂润滑试验

在分析齿轮的失效形式基础上，讨论了小型开式齿轮的润滑需求；选用了几种润滑脂，进行了小型开式齿轮的脂润滑试验；试验结果表明润滑脂能够较好地对小型齿轮进行润滑。     

齿轮实体参数化造型系统的开发

介绍了应用 Visual Basic(VB)程序语言 ,基于三维机械 CAD软件 Solid Works97平台 ,开发齿轮三维实体参数化造型设计系统的方法。解决了工业生产中齿轮三维实体造型设计的难题 ,并且提供了一种对三维 CAD软件开发的方法 ,使设计者掌握运用该方法进行实际开发 ,提高开发 CAD软件的能力     

非圆齿轮驱动结晶器非正弦振动的研究

提出一种由新型非圆齿轮驱动的连铸结晶器振动机构,给出根据结晶器非正弦振动的工艺特点设计匹配的非圆齿轮的方法;与实际中由椭圆齿轮和蜗线齿轮驱动的振动系统相比,该新式非圆齿轮可以同时满足结晶器在正滑动和负滑动区间的工艺参数要求,克服了现有非圆齿轮不能同时调节两个以上结晶器振动工艺参数的缺点,使得由非圆齿轮驱动的结晶器振动机构能够充分发挥出非正弦振动的优点,从而拓展了机械式非正弦振动机构的应用范围。