乏油状态下准双曲面齿轮传动润滑机理分析

在工程实际中,准双曲面齿轮不可避免地因润滑剂供给不足导致乏油问题,鉴于此,综合考虑了啮合区接触几何、粗糙形貌、入口区供油量、啮合界面速度矢量任意性等因素,建立了乏油状态下准双曲面齿轮传动界面任意速度矢量润滑分析模型,开展了乏油分析模型结果与文献实验数据的对比研究,数值分析了不同入口区供油量条件下准双曲面齿轮传动界面啮入点、啮合中点和啮出点的油膜演变规律,探讨了转速对不同供油量条件下传动界面润滑性能的影响。结果表明：乏油分析模型结果与文献实验数据取得了良好的一致性;随着入口区供油量的减小,3个啮合点油膜厚度的差异逐渐减小,当供油量减小到某一值时,3个啮合位置的油膜厚度基本一致;在不同的供油量下,转速对润滑状态的影响较为显著,油膜厚度随着转速的增加而升高,但是,转速升高到某一值时,乏油条件下的油膜厚度值将趋于稳定,而充分供油条件下的油膜厚度值将会继续增大。     

Top-Rem grinding tool modification considering loaded edge contact for spiral bevel gears

Focusing on the collaborative manufacturing requiring meshing interface physical performances, an innovative Top-Rem grinding tool modification considering loaded edge contact is proposed for spiral bevel gears. Accurate Top-Rem grinding tool parameters can instead of machine-tool settings and their impact in the sophisticated flank topography correction technique. At first, the whole Top-Rem tool modification includes: i) arc-shaped blade part; ii) Top-Rem part; iii) top fillet part. Then, grinding tool modification model considering both loaded contact and geometric accuracy is established. Where, three important constraint conditions were taken into accounts: i) geometric boundary considering loaded edge contact, ii) root overcutting, and iii) flank geometric accuracy. Moreover, two kinds of optimization strategies are proposed to improve the accuracy and efficiency of the whole modification: i) two types of modification by the different tool modification parameters; ii) sensitivity analysis with respect to ease-off for optimization operation of the unknown variables. Finally, the given instances can verify that it can get accurate and effective loaded contact performance optimization in early stage of full life cycle product development.     

半轴伞齿轮精锻模失效分析与对策

本文研究了拖拉机半轴伞齿轮精锻模(3 Cr 2 W 8 V钢)的主要失效形式及其机制,并在此基础上提出了延长模具寿命的相应对策。     

大变位齿轮变位系数的可视化设计

介绍了大变位齿轮的特点，变位系数的设计准则。采用计算机可视化方法设计大变位齿轮变位系数，此方法实用、可靠，适合工程应用。     

Use of a measurement technique for reproducing the surfaces of circular teeth of conical wheels

Problems are considered for determining settings for an ideal machine tool for reproducing a prescribed side surface of a circular tooth of a conical wheel that may be represented by a table obtained analytically or by measuring the tooth surface, and resetting the gear-grinding machine to compensate for production errors determined by a coordinate measuring machine. __________ Translated from Izmeritel’naya Tekhnika, No. 8, pp. 33–37, August, 2006.     

弧齿锥齿轮的加工仿真研究

通过分析弧齿锥齿轮的加工原理,建立其仿真的数学模型,实现了齿轮加工时的动态仿真     

从动圆锥齿轮毛坯吃刀现象分析

对20CrNi3A的从动圆锥齿轮进行了硬度、化学成分、金相组织等进行了分析。结果表明:吃刀现象是由于在组织中存在着硬质相(马氏体相),导致加工时严重吃刀、机床颤动剧烈等现象的发生。     

准双曲面齿轮的小轮粗切过切检验

提出了适合基于局部综合法的准双曲面齿轮精切的粗切以及粗切过切检验的方法;编制了计算机程序,在计算机上可以非常直观地看出精切余量分布情况。本文提出的方法在东风车桥有限公司切齿实验中得到了验证。     

奥里康制齿轮数控加工运动变换分析

分析了普通奥里康制齿轮机床和六坐标数控切齿机的运动规律，根据传统机床的刀盘和机床调整参数推导出六坐标数控机床加工的运动模型。     

机械减速器齿轮传动的优化设计

单级斜齿圆柱齿轮减速器的优化设计，是一个多目标优化问题。事实上把所有的优化原则作为优化目标，很难同时达到最优，只能在综合考虑各个目标的情况下，应用模糊可靠性优化设计理论将设计过程中大量的模糊数据进行科学的处理、定量的分析和研究，通过综合评价来求得一合适的优化方案。