基于VB6.0优化选配滚齿机挂轮系统的开发

在深入研究滚齿机挂轮计算数学模型和算法分析的基础上 ,用VB6 0开发了一种无差动方法加工斜齿圆柱齿轮及其挂轮选择的新方法。用本方法可以快速地选择高精度挂轮 ,达到较高的加工精度 ,在生产中有实际意义。     

DESIGN OF NONCIRCULAR GEARS WITH DISCONTINUOUS PITCH CURVE

When the noncircular gear pair is applied to the continuously variable transmission (CVT) with gear, the transmission ratio function is discontinuous. In accordance with this unique characteristic, a new approach to design and analyze noncircular gears with discontinuous pitch curve is proposed. The design courses of various noncircular gear pairs with discontinuous pitch curve are unified based on the numerical algorithm of spline fitting and "fairing boundary condition". According to the particularity of discontinuous pitch curve, the rules and procedures for teeth distribution are recommended. It is explained in detail why the undercut is formed and how to manage the undercut based on meshing principle. In addition, the calculation formulas for each tooth profile segment are also derived. If the tooth profile data are calculated, the measurement and the incision process for noncircular gear can be conducted and the CAD simulation can be achieved easily. To ensure the continuity of the transmission, the transmission interference of the tooth which is located at the pitch curve joint point is managed by utilizing Bezier curve with CAD software. And the contact ratio of gear pair is obtained. The case study shows that this approach is successful and opens up a new way for the design of noncircular gear.     

超声研齿振动子系统的研究与变幅杆设计

介绍了超声研齿的原理与方法,对超声研齿振动子系统进行了研究与分析。依据四端网络的基本原理,利用力电类比的方法,给出了换能—变幅器的等效电路图,并通过电路运算,推导出换能—变幅器的频率方程和放大倍数的计算公式。据此,设计出了谐振特性良好的超声研齿换能—变幅器。最后对超声研齿振动系统的谐振特性进行了测量,理论计算与试验基本相符。     

螺旋角对双圆弧齿轮动态行为的影响分析

该文基于圆弧齿轮的啮合传动特点, 应用已建立的双圆弧齿轮单自由度啮合振动模型, 理论研究了螺旋角对双圆弧齿轮传动过程中振动行为的影响, 结果表明, 在条件允许时, 取较大的螺旋角有利于提高双圆弧齿轮传动过程中的动态性能．     

渗碳淬火齿轮畸变控制技术的研究现状

介绍了渗碳淬火零件热处理畸变的原因,分析了热处理内应力的形成过程。根据硬齿面齿轮生产现状,分析了影响渗碳淬火齿轮畸变的因素,并提出了减小畸变的措施。指出有必要从系统控制的角度出发,在设计、原材料、锻造、预处理、机械加工、渗碳淬火等方面,对齿轮畸变进行系统化的研究,以期掌握引起齿轮在生产全过程中畸变的主要原因及减小畸变的有效措施。     

TOOTH CONTACT ANALYSIS OF CONICAL INVOLUTE GEARS

The mathematical model of conical involute gears is developed based on the theory of gearing and the generating mechanism. Tooth contact analysis (TCA) is performed to examine the meshing and bearing contact of the conical involute gear pairs with intersected and crossed axes. In addition, the principal directions and curvatures of the gear surfaces are investigated and the contact ellipses of the mating tooth surfaces are also studied. Finally, the numerical illustrative examples are provided to demonstrate the computational results, test gears are made for tooth-bearing tests, and the conclusion is verified that the theory has the applicability.     

螺旋锥齿轮超声研磨加工的机理与实验研究

提出了超声研磨加工螺旋锥齿轮的理论与方法,利用声弹性理论分析了超声波在齿面传播与反射的机理。超声研齿的材料去除以塑性流动去除为主,机理可归结为磨粒锤击微切削、弹跳冲击与研磨液空化效应。试验证明,超声研齿的材料去除率为普通研齿加工的3倍,且齿面质量明显提高,齿面粗糙度Ra为0.2μm,水平截距c为1.2μm。最优工艺参数组合中转矩为0.12 N.m、转速为600 r/m in、研磨剂浓度为20%,其中转矩对材料去除率的影响最为显著,达到68.11%;其次为转速。对最优工艺参数组合所作的验证试验,材料去除率MRR指标与预测值基本相符。     

基于ANSYS软件砂轮架的有限元分析与优化

在磨齿机中,砂轮架是磨削头的重要组成部分,其性能好坏直接影响内齿轮加工的精度。本文通过ANSYS软件对砂轮架进行结构强度分析。使其满足刚度的同时又可以节约成本。为零件的动态设计打下基础。     

齿面综合研磨率分析与研齿性能试验

首次通过对研齿过程的轮齿接触仿真,齿面瞬时接触应力、齿面滑动系数与齿面研磨概率的研究分析,建立了齿面综合研磨率的评价指标,并进行了研齿性能试验。结果表明,准双曲面齿轮齿面中部研磨要严重一些,靠齿根稍重些,靠齿顶稍轻些,这与传动误差变化规律一致。研齿能一定程度上降低齿形、齿距误差,尤其对轮齿的实际啮合精度改善明显,振动噪声均有较大下降。     

齿面研磨边界的确定与研齿性能试验

通过对研齿过程的轮齿接触仿真,传动误差与重合度的分析,确定了齿面研磨区域的边界:距齿面中点±0.25～0.3个齿宽,±0.1～0.25个齿高.通过研齿试验,研究了研磨对齿面接触印痕、齿形精度与动态啮合性能的影响.结果表明,研齿能一定程度上消除齿形误差,改善轮齿接触区位置与形状,使热处理后变形的接触区一定程度上得到恢复;研齿对齿轮副动态性能改善明显,振动噪声在转速、载荷较宽的范围内均有明显下降.