换模小车驱动力矩及功率计算

首先对换模小车行走装置进行运动分析,并对其车轮受力进行分解,通过推导计算出滚动摩擦阻力和惯性阻力的计算公式和数值,最后求出小车行走所需要的电机减速机扭矩和功率,为换模小车行走的减速机规格选型和电机功率选型等提供可靠依据,其中滚动摩擦阻力计算时,不仅考虑了理论摩擦力而且还考虑了车轮轮缘与轨道的摩擦阻力、爬坡阻力等因素,使计算结果更贴近实际,保证考虑因素的完整性。     

离心铸造机电机功率计算

根据离心铸造机的构造和工作特点，提出了悬臂式和托轮式离心铸造机的驱动电机功率具体计算公式。     

行星齿轮变速器传动比和力矩计算与功率流图

给出了行星齿轮机构传动比计算的通用公式和内外力矩的算法，并和与功率图结合，帮助了解功率在变速器中的整个流程，据此找到提高效率的途径。     

张力减径过程中电机功率的理论计算及分析

结合宝钢钢管厂的实际情况,从一般能量原理出发,采用轴对称模型,利用上限法推导出可以计算电机功率的多变量公式,并从理论上计算出在张减过程中电机负功率的存在。实践证明,该公式的计算结果与实际情况基本一致,可以作为经验公式指导生产。     

旋转式飞剪机伺服电机功率计算探讨

在飞剪控制系统中,飞剪机伺服电机作为机械和电气的接口,将电能变换成机械能,在整个系统中起到重要的作用.伺服电机的功率计算和选择是飞剪机的技术核心之一,本文介绍了飞剪机伺服电机的功率计算方法.     

振动给料机及振动筛电机功率的计算

在铝土矿和石灰石矿山矿石运输和卸料的工程设计中．分析给料机及振动筛的启动过程．计算出合理的电机功率数据。从而保证惯性振动给料机及振动筛正常运行,使电能合理消耗,保证矿石运输和卸料过程畅通无阻,从而使矿山的生产安全、可靠。     

冲模模架及装配技术

分析了冲模模型的基本类型，讨论了冲模模架的技术要求，介绍了标准模架的装配工艺，并指出了模架装配时的注意事项。     

压力机移动工作台电机功率的计算及行走控制方式的选定

介绍了机械压力机移动工作台的电机设计和移动方式选择。     

细长杆零件挤压及模架设计

阐述了细长杆零件先预镦毛坯、再挤压成形达到所需长度的工艺，在模架设计方面也有许多新颖、独到、简单易行的方法。     

虚拟仪器技术在机械传动系统扭矩和功率测试中的应用

利用虚拟仪器技术,实现了机械传动系统扭矩和功率的自动测量.文章介绍了该测试系统的结构、功能和系统的软硬件构成以及它们的实现方法.这种测量方法以灵活的软件功能代替固化硬件,提高了系统的可靠性和测量精度.     

六辊轧机轧辊传动力矩计算

对轧辊部件进行强度校核和对主电机过载、过热校核都需要轧辊传动力矩这一参数,为此,对六辊轧机辊系进行受力分析,从而给出了轧辊传动力矩的计算公式。     

冷轧辊新材质BGS钢的研究

首先进行了化学成分设计 ,按照设计成分炼钢、制成试样 ,并用试样进行球化退火、淬回火、残余奥氏体测定、临界点测定等一系列的试验 ,最终确定了 BGS钢冷轧辊用新钢种。该钢种与当前的 MC系列相比具有一些新的优点 ,是良好的冷轧工作辊用钢     

A power spectrum analysis of effect of rolling texture on cutting forces in single-point diamond turning

In most of the existing metal cutting theories, the workpiece is assumed to be homogeneous and most continuum theories do not take into account the effect of crystallographic anisotropy that causes variations in the shear plane at the grain level and hence of the cutting force. As the depth of cut in single-point diamond turning (SPDT) is usually less than the average grain size of a polycrystalline aggregate, cutting is generally performed within a grain. At this scale, the difference in the individual grain properties cannot be integrated out and a continuum solution would be insufficient. As a result, this paper presents a power spectrum analysis of the periodic fluctuation of micro-cutting forces in SPDT of polycrystalline materials. The experimental results show that the features of the power spectra of the cutting forces can be well correlated with the change of rolling texture of the materials being cut. These findings help to explain quantitatively the fluctuation of micro-cutting forces and hence the effect of rolling texture in SPDT, which are not encountered in conventional machining.     

冷轧磁性过滤设备内乳化液流动特性的研究

实验研究了搅拌器转速、搅拌时间和静置时间等因素对冷轧乳化液的粒径大小及浓度变化的影响;对生产现场磁性过滤器内不同粒径乳化液的两相流动进行了数值模拟研究,发现过大粒径的乳化液是导致现场乳化液浓度不稳定的关键因素。根据研究结果指导现场生产时对乳化液粒径进行了优化,最终解决了生产过程中因乳化液系统导致的轧制不稳定问题。     

Characterisation of periodic variation in torque occurred in friction stir welding process

Friction stir welding was physically simulated to study torque variation by a rotational friction process under constant axial pressing speed. The results indicated that the torque accurately reproduce the same periodic characteristics as the friction stir welding torque, i.e. the torque cycle is equal to the time of one tool rotation. The periodic variation intensity of torque, which was obtained at a constant rotational speed ω and a constant axial pressing speed v, was characterised by non-dimensional amplitude of the torque Γ*. Moreover, a semianalytical model, which describes Γ* as a function of ω²/v in Arrhenius form, was established. In this model, Γ* exponentially increases with ω²/v, and low ω²/v suppresses the variation intensity of torque.     

分布式驱动电动汽车动力转向系统切换控制及其操纵稳定性试验

动力转向系统对电动汽车的设计与装配具有重要的影响.动力转向系统具有典型的不确定性、未建模动态、测量噪声和干扰等非线性动力学特征,是包含离散事件与连续事件的混杂动力学系统.分析了分布式驱动电动汽车动力转向系统的控制结构、控制功能及其动力学行为,建立了反映连续和离散控制行为的混杂控制系统模型;建立了动力转向系统的切换控制结构,进行了20 km/h和40 km/h下的蛇形实验.结果表明:在20 km/h下,转向系统转矩的峰值和平均值分别降低了40.93％和40.99％;在40 km/h下,转向系统转矩的峰值和平均值分别降低了31.11％和32.12％,转向轻便性得到明显改善.不仅改善了动力转向系统的鲁棒性能,而且对电动汽车控制性能的改善、性能的优化及安全性能的提高都具有重要的实用价值.     

滚子链拆解装置的设计

设计了一款滚子链拆解装置,主要包括链条夹紧机构和销轴顶出机构。本装置的链条夹紧机构可防止销轴顶歪,用凸轮机构提供顶出力从而实现快速拆链,可安装三枚不同规格的顶针用于拆卸不同链号的滚子链。本装置具有拆解速度快,制造成本低,拆解链号多,能拆解大链号滚子链等优点。     

激光功率密度对熔覆层磨损性能的影响

采用激光熔覆技术在40Cr钢表面制备了Co基熔覆层。利用体式显微镜和显微硬度计,对熔覆层分别进行了宏观形貌观察和显微硬度测试。根据熔覆后零件的实际工作状况,有针对性地采取了滑动+滚动的摩擦方式对熔覆件进行干摩擦试验。结果表明,随着激光功率的增加,熔覆层参数(熔高、熔深、熔宽)逐渐增加;显微硬度则出现先升高而后降低的趋势;其磨损机理依次呈现氧化磨损-磨粒磨损-粘着磨损-疲劳磨损。研究发现提高零件硬度不等于提高了耐磨性。     

Effect of power on microstructure and properties of laser cladding NiCrBSi composite coating

A laser clad NiCrBSi composite coating was fabricated on the surface of 42CrMo steel using 6?kW fibre laser. The morphology and composition of the composite coating formed under different powers were studied using scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction spectroscopy. The microhardness and wear resistance were measured with a MICROMET-5103 digital microhardness tester and a MM-200 ring-block wear testing machine, respectively. The results showed that the cladding layer and the substrate have good metallurgical bonding. The microstructure nearing the fusion line is a columnar grain and that of the cladding layer is mainly a cellular grain. The main phases of the laser cladding layer are γ-Ni, (Fe,Ni), M₇C₃, M₂₃C₆ and CrB. The dilution rate of the laser cladding layer increased with the increase of laser power. The microhardness of the cladding layers decreased with the increase of laser power, and wear resistance of the cladding layer first increased and then decreased with the increase of laser power. When the laser power was 2000?W, the wear resistance of the composite coating was at its highest.