齿轮轴楔横轧齿形成形质量影响因素研究

应用楔横轧技术生产齿轮轴不仅生产效率高,材料浪费率低而且成形的齿轮轴具有更高的强度.应用Deform软件对齿轮轴楔横轧成形过程中轧件温度、齿数、模数、模具运动速度和分度圆直径对齿形质量的影响进行研究;得出了各因素的重要性影响大小的顺序和各个因素对齿形成形质量的影响规律.     

曲轴磨双圆角及滚斜纹工艺的研究

简要介绍了一种发动机曲轴双圆角和外斜纹的结构特点，详尽阐明如何借助普通设备来完成其精磨双圆角、滚压斜纹的工艺过程和实验方法，提供了一条解决此类问题的简化思路。     

An analysis of external spline gear forming by an upper bound energy method

Closed-die forging of external spline gear forms is analysed using an upper bound elemental energy method. The kinematically admissible velocity field for the three-dimensional deformation was obtained on the assumption that the profiled surface of the tooth was straight but tapered. The upper bound to the deforming load necessary and the deformed configurations are predicted using integration of the formulation of energy expressions which were obtained from the presented velocity fields. Two different forging methods denoted here as A, viz. a side extrusion method and B, an upset forging method, the details of which are given in the text, were considered in the present analysis and the theoretical results compared with experimental ones. Experiments were carried out on plasticine as model material at room temperature where talcum powder was used as a lubricant. The present investigation revealed that the analytical method B predicts a reduced forging load and improved configuration better than method A for the forged products.     

Finite element analysis on axial-pushed incremental warm rolling process of spline shaft with 42CrMo steel and relevant improvement

In this paper, the influence of the configuration of the geometric structure of the machined surface on the course of the wear process of frictional pairs is discussed. Arrangement of traces of machining determined the level of surface structure isotropy. The characteristics of surface layers are discussed, with particular emphasis on the surface structure isotropy. The results of experimental investigations carried out on the specially designed and made setup are presented. As the measures of the wear process, the following quantities were determined: the mass decrement of samples and changes of the surface roughness parameters, root mean square (RMS) of profile R _q and reduced peak height of profile R _pk . The results of experimental investigations were registered for structures with different levels of isotropy and, thus, traces of machining. The investigations confirm the influence of the tested factors on the intensity of the wear process.     

蓄电池叉车电动机花键轴的结构与设计

用于蓄电池叉车的电动机与液压泵之间是通过花键联接传递扭矩。一般情况 ,电动机的轴做成内花键 ,液压泵轴做成外花键。由于蓄电池叉车体积要小 ,而且要求外形美观 ,电动机应尽量做得很小 ,因此电动机轴的直径也较小 ,其长度一般为2 5 0～ 40 0ｍｍ ,直径最小处为 2 5ｍｍ ,将轴的内花键加工成 4- 15× 12× 4或 6 - 2 0× 16× 6 ,若用插齿或电火花等方法加工 ,成本较高 ,而且也不能满足批量生产的需要。为解决这一难题 ,常州牵引电机厂采用了组合轴的方法 ,即将电动机轴分成两段 ,较短的一段加工成内花键 ,再采用较合理的配合方式与较长的…     

Research on forming precision of flexible rolling method for three-dimensional surface parts through simulation

Flexible rolling is a novel forming process for three-dimensional surface parts using a pair of bendable rolls. By controlling the distribution of the gap between the upper and lower forming rolls in the rolling process, the sheet metal is nonuniformly thinned in the thickness direction and the longitudinal elongation is different in the width direction of the sheet metal, which makes the sheet metal deform in rolling direction. With the rotation of the bendable rolls, the sheet metal is deformed consecutively and a three-dimensional surface part could be obtained. A small experimental device has been designed. Finite element analysis (FEA) model is established. Spherical surface and saddle surface are simulated, and their experimental results are presented. The major purpose of the present work is to analyze the forming precision of flexible rolling and the reasons for the shape errors through simulated and experimental results. The results demonstrate that the proposed process is a feasible and effective way of forming three-dimensional surface parts.     

大型筐形保持器成型弯圆机设计与应用

简要介绍保持器的焊接加工过程及其经济价值,阐述大型筐形保持器成型弯圆机工作原理和使用方法。     

大圆弧弯曲件成型工艺设计方法

回弹是影响弯曲件成型尺寸的重要问题.阐述了控制弯曲件回弹的一般方法,提出了用反向回弹补偿的办法控制大圆弧弯曲件尺寸.通过模具设计解决了围板件成型回弹的技术难题,证明了这一新方法行之有效.     

硬质合金圆柄止动槽成型刀设计

针对加工止动槽用硬质合金焊接刀刃磨时,其宽度难以控制、对刀困难、无法加工倒角等问题,设计了圆柄止动槽成型刀代替硬质合金焊接刀,只需刃磨排屑槽,节约了磨刀时间,保证了止动槽宽度尺寸,节省了倒角工序,提高可产品质量和经济效益。     

热轧卷取设备芯轴的设计与研究

热轧卷取法为PHC管桩端板的生产提供了一种新的工艺,该方法充分利用了轧制后带钢的余热并通过横向卷取将带钢卷绕成螺旋形,后经切割压平焊接等工序得到端板毛坯。使用该方法的卷取设备中卷绕部分机构尤为重要,需要对带钢的卡紧定位以及芯轴的强度进行分析。     

双轴双偏心滚切剪剪切力分析

在对滚切剪剪切状态综合分析的基础上,探讨了滚切剪在剪切过程中的力学特性,推导了适合滚切剪的剪切力解析表达式,找到了剪切力的变化规律;并根据某企业滚切剪的具体参数,对其剪切力进行了计算校核,开展了滚切剪关键零部件的有限元分析,为零部件的设计和电器控制系统的布置提供了指导.     

两级展开式圆柱齿轮减速器用滚动轴承和传动轴的设计

机械中轴承和传动轴的设计,涉及大量的运算,相对比较复杂,本文根据在带式运输机上的实际运用情况,详细阐述了轴承和传动轴的设计计算以及疲劳强度的校验等。     

Development of sheet metal forming dies with excellent mechanical properties using additive manufacturing and rapid tooling technologies

Cost and time are two major concerns that are needed to manufacture new sheet metal forming dies in the industry. A cost-effective approach for rapid production of sheet metal forming dies with excellent wear resistance and mechanical properties was developed using additive manufacturing and rapid tooling technologies. This paper deals with the effect of zirconia (ZrO₂) addition on the mechanical properties of sheet metal forming dies. Sheet metal forming experiments confirmed that the sheet metal forming dies fabricated by epoxy resin filled with 30 wt% ZrO₂ particles have the low corner wear. The sheet metal dies can be fabricated within 2 days to meet the requirements of reducing the development time in the research and development stage for a new product.     

曲轴滚压强化圆角变形的有限元分析与仿真

建立了曲轴滚压强化圆角变形的有限元模型,利用ANSYS有限元分析软件,获得了曲轴滚压每一步加载过程中圆角处应力、应变分布,残余变形量等情况,为优化曲轴滚压强化工艺提供理论基础.     

变轴间距等速齿轮连杆机构综合方法

以一种变轴间距等速齿轮连杆机构为对象,详细地分析了该机构的运动原理及各组成部分的运动学作用,从而提出了变轴间距等速齿轮连杆机构的综合方法.     

成形法加工新型环面蜗杆的原理性误差分析

新型环面蜗杆副由蜗杆、钢球和蜗轮构成,利用失配共轭技术,提高了其承载能力和适应性.在分析蜗杆廓面结构特征的基础上,给出了蜗杆廓面的准线方程,提出了基于准线的成形法加工方法,着重分析了加工过程中的原理性误差,推导出了廓面法向误差公式.以一组数值参数为例,绘制了齿形误差和齿向误差图,并在OpenGL平台上进行误差可视化处理.结果表明:成形法加工的蜗杆廓面齿形和齿向误差值较小,能够保证获得高精度的传动廓面.