钢制车轮弯曲疲劳试验与寿命估算

疲劳破坏是引起钢制车轮失效的主要原因。在钢制车轮应用中,应该评估好其性能特征,降低车轮失效机率,同时保护好车轮的安全度。根据钢制车轮的使用标准,设计弯曲疲劳试验,在此基础上估算车轮的寿命,加强钢制车轮的性能控制力度。本文以钢制车轮为研究对象,分析弯曲疲劳试验与寿命估算。     

金固股份:技术实力领先的汽车钢制车轮行业龙头

浙江金固股份有限公司(以下简称"金固股份")是一家以钢制车轮的研发、生产和销售为主营业务的高新技术企业,公司主要产品为钢制滚型车轮,包括5°滚型系列和15°滚型系列的钢制车轮。5°钢制滚型车轮主要用于轿车、微型车等乘用车和部分特种用途车辆;15°钢制滚型车轮产品主要     

乘用车钢制车轮发展方向

通过对国外车轮市场的分析,综述了国内乘用车钢制车轮发展的趋势,介绍了乘用车钢制车轮在新材料、新结构、新工艺等方面的发展方向。     

高强度钢制车轮的轻量化研究

车轮是汽车最重要的承载件之一,其轻量化研发成为汽车行业发展的焦点。论述了高强度钢轮的性能要求,重点从新材料研发、车轮轻量化优化设计、钢轮制造工艺改进三方面,对高强度钢制车轮的轻量化研究深入剖析,进一步挖掘高强度钢制车轮轻量化潜力,希望能为钢制车轮轻量化研究开拓思路。     

基于AutoCAD的钢制轮辋滚压模具参数化设计

为了实现汽车钢制轮辋滚压模具的快速设计,结合反求工程的思想,基于参数化设计方法,使用C#编程语言对AutoCAD2010进行了二次开发。该系统能够根据反求工程采集的车轮实体的参数或者根据国家标准中汽车钢制轮辋型号快速生成钢制轮辋滚压模具图纸,提高汽车车轮生产企业的研发效率,缩短产品开发周期。     

汽车钢制车轮的响应面法优化设计

针对汽车钢制车轮研发周期长和生产成本高的问题,以15×5J钢制车轮为例,基于ANSYS Workbench 19.2软件完成车轮重要尺寸的参数化建模并创建车轮弯曲疲劳试验有限元模型,采用优化空间填充设计法,生成车轮重量及Mises应力的试验数据,获得车轮重量及应力响应面,最终在短期内成功确定车轮最优轻量化数模并应用于生...     

钢制车轮组冷装法与热装法对比分析

通过对钢制车轮组常用的装配方法——冷装法和热装法,进行计算、对比、分析,证明热装法比冷装法对零件受力和车轮组寿命有利。     

钢制车轮弯曲疲劳寿命的影响因素

弯曲疲劳寿命是钢制车轮的一项重要性能指标,但制造过程中的过盈配合和轮辐板厚变化对车轮疲劳寿命的影响规律尚不清楚。本文通过测定轮辐板厚变化规律,并建立考虑过盈配合和轮辐板厚变化的钢制车轮弯曲疲劳有限元模型,比较了是否考虑这两种因素对车轮疲劳热点位置应力水平的影响,最后采用比例双轴疲劳方法预测车轮疲劳寿命。结果表明,过盈配合及轮辐板厚变化均会带来车轮弯曲疲劳寿命的下降,在有限元分析中不可忽略。     

有限元分析与疲劳评价在钢制车轮轮毂开发中的应用

应用eta／DYNAFORM成形分析,ANSYS结构分析和FE—SAFE疲劳分析软件,对某型轿车钢制车轮轮毂结构进行了三维有限元计算,求得车轮轮毂综合应力场。分析结果经疲劳分析软件处理,以云图方式显示出车轮轮毂的疲劳循环次数和安全系数。     

基于ANSYS的车轮轮辐螺母座刚度结构优化

应用ANSYS软件对某型轿车钢制车轮轮辐螺母座刚度计算，求得车轮轮辐综合应力场及最大塑性变形位移，然后应用ANSYS进行优化。结果表明：采用有限元优化方法能够快速有效地获得轮辐螺母座的最佳结构，为轮辐设计提供新方法和思路。     

基于控制的自由摆激光追踪系统

分析了自由摆激光笔控制系统设计的要点与难点,建立了激光笔转角与自由摆转角之间的数学关系。利用单片机根据一定的控制方法与策略,采用步进电机控制位于摆杆末端与激光笔固连的平板转动,使得自由摆在任意摆动过程中激光笔光斑始终能够瞄准照射在靶纸的中心。最后在该自动控制系统的基础上提出了两种改进方案。拓宽其应用范围,并且对其未来的发展方向做出了展望。     

四轮驱动汽车车轮驱动防滑的牵引力控制仿真分析

为提高全时四轮驱动汽车的整车动力性和行驶稳定性,建立了发动机、轴间/轮间电控限滑差速器及相应的液压控制系统数学模型,设计了发动机目标转矩模糊控制器、轴间电控限滑差速器模糊控制器以及轮间电控限滑差速器PID控制器,提出了基于驱动防滑的全时四轮驱动汽车牵引力控制策略。应用所制定的牵引力控制策略,分别在低附着均一路面、对接路面、分离路面及上坡分离路面上对整车加速性能进行了仿真分析,结果表明,所制定的牵引力控制策略能够根据各驱动轮的滑转状态调节驱动轮的驱动力矩,有效地抑制了驱动轮的过度滑转,提高了汽车在恶劣路面的动力性和行驶稳定性,并有较好的适应性。     

Investigation and development of a molding process for the production of micro-hairs

Cubic boron nitride (cBN) is a unique synthetic material on account of its high hardness, high wear resistance, excellent cutting edge stability and relative chemical inertness compared to diamond. The introduction of monolayer electroplated cBN wheels replaced the complex pre-grinding wheel preparation work (truing and dressing) of composite cBN wheels and thereby extensively facilitating the application in high-efficiency deep grinding, creep feed grinding, etc. The present work has aimed at developing a precisely controlled brazing technique suitable for bonding the cBN grits to a steel substrate in monolayer form with higher bond strength, larger grit protrusion and more uniform grit distribution compared to that in the currently used galvanically bonded wheels. Experimental investigation have clearly demonstrated the potential of the newly developed brazed wheels under varying grinding conditions for processing materials like bearing steel. Improved capability of these wheels over galvanically bonded wheels could be better recognised during dry grinding at high material removal rate and for large stock removal when galvanically bonded wheels were found to suffer from severe wheel loading in grinding bearing steel and from unusual increase in grinding forces due to grit pullout. Creation of wider inter-grit spaces with strong bonding and uniform grit spacing happened to be the essence of the present brazed cBN wheel.     

新型月球车的特点与性能分析

随着国内外掀起的新一轮的探月高潮，新型的月球车越来越受到人们的关注。本文针对月球探测的特点和要求，提出了一种两轮并列式月球车，并对此月球车的特点和性能进行分析；同时，结合两轮并列式月球车的结构和性能，提出了以两轮并列式月球车为子系统的群控策略以降低月球探测的风险，提高月球探测的效率。     

Grinding of steel by diamond wheels

The microstructure of stainless steel and hard steel is studied after grinding by diamond wheels.     

On the grindability of low-carbon steel under dry, cryogenic and neat oil environments with monolayer brazed cBN and alumina wheels

Grinding of low-carbon steel often exhibits severe wheel loading due to the formation of long chips and high adhering tendency of the work material with the grits. Conventional composite-type alumina wheels are commercially utilised for grinding low-carbon steel. However, the actual nature of grit wear cannot be truly understood in a composite wheel. The truing and dressing conditions also have some influences on the wear mechanism. Therefore, in order to explore the wear pattern on a single layer of grits, monolayer brazed cBN, white and grey Al₂O₃ wheels were used in the present study. The grindability of AISI 1020 steel was evaluated under dry, liquid nitrogen and neat oil environments. The surface profile of the workpiece after being ground in each environmental condition was traced with a surface profilometer to reveal the mechanism of grit wear. The post-grinding conditions of the wheels were observed using scanning electron microscopy. The cBN wheel was found to outperform the alumina wheels in terms of grinding forces and grit wear. The wear of the cBN wheel was remarkably arrested with the application of neat oil. On the other hand, large-scale adhesion and breakage of grits in white alumina wheel were observed under cryogenic environment. In fact, the beneficial role of liquid nitrogen could not be realised in reducing grinding forces and grit wear with all the three types of wheel. A lubricating agent like neat oil appeared to be more suitable than cryogenic cooling when grinding low-carbon steel.     

电动轮驱动汽车差速性能试验研究

对电动轮驱动汽车的差速问题进行了深入分析,提出对驱动电机采用转矩指令控制、转速随动的方法实现电动轮系统的自适应差速。开发了电动轮驱动试验车。进行了转向行驶、路面不平及车轮半径不等等工况的道路试验。试验结果表明,电动轮汽车在各种行驶路面及行驶工况下都能保持良好的差速性能,具有自适应差速特性。     

FSAE赛车四轮转向系统PID控制仿真

根据已知的前后轮转角控制关系,采用PID控制来控制电机的运行。在此基础上,对FSAE四轮转向赛车进行了系统仿真,并针对仿真结果进行了系统的分析,结果证明了PID控制策略对于控制FSAE四轮转向赛车的可行性,并为后续的实践打下了理论基础。     

形貌重构砂轮磨削试验研究

设计了一种金刚石纤维切削装置，用其对白刚玉砂轮进行断续飞切来加工出断续微沟槽，从而实现砂轮的表面形貌重构。采用原始砂轮及形貌重构砂轮分别进行GCr15淬硬轴承钢的常温干式、浇注式磨削的对比试验研究，探讨了形貌重构砂轮的磨削性能。试验结果表明：相较于原始砂轮，在相同的试验条件下形貌重构砂轮在磨削时其磨削力和磨削温度均可以显著降低。通过常温干式、浇注式润滑条件下的磨削对比试验验证了形貌重构砂轮可以更有效地将磨削液带入磨削区进行润滑冷却。