基于Solidworks Simulation的水液压缸驱动滑块结构的有限元分析

滑块是高速精密压力机最主要的执行部件,常为液压缸驱动滑块。水介质压力机对滑块的刚度和质量都有较高要求。利用Solidworks Simulation对滑块结构进行有限元分析,分析其应力和位移分布规律,以两边支点间距、中间支点间距为设计变量,对滑块进行优化设计,最终为滑块结构的改进设计提供依据。     

拉延压力机八杆机构的优化设计

运用杆纽法时压力机八杆内滑块机构进行了运动分析，在此基础上，提出了用拉深区速度波动量、拉深速度、拉深深度．拉深角为评价压力机八杆内滑块机构性能优劣的指标，采用一维步长搜索法对机构进行了优化设计，优化出多组拉延性能好于原机构的方案。     

六连杆机械压力机传动机构优化设计

在分析六连杆机械压力机传动机构结构尺寸设计和运动包络线基础上,建立了传动机构运动不干涉约束条件,以滑块在工作行程内速度波动量最小和接触板料速度最小为优化目标,采用惩罚函数和复合形相结合的优化算法,进行六连杆传动机构优化设计。从而解决以往的文献在进行机械压力机传动机构优化设计时,由于均未考虑传动机构的结构设计导致的运动干涉,致使优化结果难以应用到实际工程中的问题。优化算例表明,滑块速度曲线有明显改善,减小了滑块对板料的冲击,同时优化后的杆系参数能够满足各传动构件结构设计和运动不干涉要求,为六连杆机械压力机传动机构参数设计提供了有效方法。     

多连杆压力机优化设计

针对某一新型的多连杆高速压力机,进行了运动学分析建模。根据给定的性能指标,基于Matlab编程软件,利用步长搜索法对各杆件的结构尺寸进行优化设计。在优化参数基础上,获得压力机主滑块的位移、速度和加速度曲线,并与传统曲柄滑块机构运动曲线进行了比较,结果表明此多连杆压力机具有下死点附近位移曲线相对平缓,进程和回程速度快等特点,对于工件成型精度和提高加工效率有一定的意义。     

基于Solid Works Simulation的水液压缸驱动滑块结构优化

以水液压驱动式四点压力机为例,通过Solid Works软件对其滑块部分进行建模,并使用Solid Works Simulation插件进行有限元分析,得出滑块支点间距变化影响最大变形位移量变化的规律,然后对滑块的结构进行优化设计,为四点压力机中滑块的改进设计提供了数据参考和理论依据。     

基于ARM和FPGA的嵌入式伺服压力机控制系统设计

通过对曲柄滑块伺服压力机和伺服电机的工作原理进行分析,对伺服压力机控制系统的软硬件进行了选择和设计,为伺服压力机滑块的精确控制提供了依据。设计了以S3C2440微处理器和FPGA为核心的控制器,构建了Linux+Xenomai的实时操作系统,并采用Qt/Embedded开发人机交互界面。控制系统功能完善,操作界面设计人性化。     

机械压力机滑块结构性能分析

分析机械机械压力机滑块的结构组成与工作特点,针对设计初选参数,通过理论公式计算与有限元方法,对滑块的强度与刚度进行校核,讨论钢板尺寸对压力机滑块的刚度与强度的影响。     

新型门式双点高速高刚度压力机主传动结构及仿真分析

为使机身高度和整机重心降低,实现高速压力机传动系统更加平稳、抗振性能更好的目标,经分析现有机械压力机结构特点及运动特性,改变压力机主传动结构,设计了一种门式双点高速高刚度压力机主传动结构.创建了主传动结构装配模型,阐述了所设计新结构压力机的工作原理以及主要特征,并借助ADAMS仿真分析软件创建了传动结构参数化设计模型,通过摆杆位置参数化设计,获得了几组滑块运行特性曲线,通过曲线对比可以直观地看摆杆连接位置影响下的滑块运动特性变化规律.     

基于ADAMS的八连杆压力机的优化设计

运用ADAMS建立了多连杆压力机传动机构的虚拟样机模型,并建立了传动机构运动不干涉约束条件。以滑块在工作行程内速度波动量最小为优化目标函数,对八连杆传动机构进行了优化设计。优化结果表明,优化之后滑块速度曲线有所改善,滑块在拉伸区内速度波动量较小,减小了滑块对板料的冲击,可延长模具的使用寿命。     

基于MATLAB与VB的六连杆内滑块机构优化设计

针对拉延压力机,尤其是双动拉延压力机工作机构特性,分析了其内部滑块机构的运动特点.以"连杆曲线"型六连杆机构为例,采用复合型法建立了平面六连杆机构的运动分析数学模型.为了获取理想的运动结果,应用MATLAB软件和Visual Basic 6.0软件编程实现了"连杆曲线"型六连杆机构设计参数的优化,并进行了运动仿真分析.对比分析优化前后的运动曲线后发现,方案优化后的内滑块在工作行程内的速度更加均稳.     

混合驱动拉深压力机运动学优化综合与仿真

提出了用于拉深工艺的混合驱动压力机的机构构型,并对其进行了正运动学分析;建立了混合驱动拉深压 力机优化设计的数学模型和方法。首先优化综合机构的几何参数,再用10次Bezier曲线优化伺服电机的运动规 律,从而可使滑块的输出运动能实现一组较理想的轨迹,通过仿真结果分析了混合驱动拉深压力机的优点。     

An Air Bearing Slider for Small Diameter Disk Storage Devices

The authors propose a novel slider design. The tri-pad slider has three separate air bearing surfaces, one in the front of the slider and the other two in the back of the slider. This design permits the optimization of the air bearing stiffness and flying attitude without changing the minimum flying height. It can minimize the effect of skew angle on the flying height, and offers ample room for a larger size thin film head element. Samples were fabricated and flying characteristics at several velocities, as well as the dynamic flying stability, were investigated.     

Observation of Slider Landing Process in Hard Disk Drive

With the decrease in slider flying height, slider flying instability caused by slider–disk interactions is becoming a big concern. Novel technology has to be employed to further improve our understandings about slider–disk interaction. In this work, a slider flying height-attitude testing (3D) system was employed to study slider–disk interaction during a slider landing process to demonstrate its capability for the application. It is shown that great details of slider–disk interactions and subtle variations of the slider flying attitude during the landing process can be revealed with the 3D system. Slider dynamic flying height and attitude (pitch and roll angles) during the landing process can be determined from the data recorded in one test. Furthermore, analysis in frequency domain can be done not only on flying height, but also on pitch and roll angles directly. It is found that the slider landing process can have different stages during which slider performance and characteristics of slider–disk interaction are different.     

Lubricant Flow and Accumulation on the Slider’s Air-Bearing Surface in a Hard Disk Drive

Lubricant accumulation on the slider’s surface of a hard disk drive (HDD) has a detrimental effect on its read/write performance. Air flow through the slider-disk clearance moves some of the lubricant from the air-bearing surface (ABS) toward the slider’s lateral walls where it accumulates. In this article, we show by numerical simulations that the lubricant accumulation characteristics are strongly dependent on the slider’s flying height, skew angle and ABS design. The lubricant flow on the slider’s surface is quantified numerically. Air shear stress, air pressure and disjoining pressure are used as driving forces in the simulations. The lubricant thickness profile and volume evolution are calculated for two states of the HDD: operating and at rest. In the first state, lubricant is driven by air shear stress toward the trailing edge of the slider where it accumulates on the deposit end. In the second state, lubricant from the deposit end flows back into the ABS driven by the action of disjoining pressure. Lubricant accumulation on the four lateral walls of the slider is taken into account. The lateral walls are unfolded to study the flow using a two-dimensional lubrication model. The effects of flying height, skew angle and slider design on the accumulation removal of lubricant from the ABS are determined for the two states of the drive.     

基于RecurDyn的八连杆机构参数化设计及优化

以大吨位冲压压力机中的闭式八连杆机构为研究对象,根据滑块总行程、最大拉伸深度、有效拉伸过程中的最大拉伸速度等3项要求,对其进行杆系尺寸优化设计.在RecurDyn平台上建立了八连杆机构的参数化模型,经过运动学仿真,获得滑块的位移和速度曲线.基于位移曲线获得滑块总行程,基于速度曲线及有效拉伸过程中的最大拉伸速度要求获得可...     

Optimal design of one-dimensional porous slider bearings using the Brinkman model

On the basis of the Brinkman model, a theoretical study of the optimal load-carrying capacity and friction coefficient for one-dimensional curved porous slider bearings with the gap width varying slowly is presented. The modified Reynolds equation is obtained by applying Brinkman equations to guide oil motion through the porous matrix. By using the technique of calculus of variations, the optimization is performed over a class of step profiles. According to the analysis, the step height ratio and riser location of the optimal geometry are found to depend upon the permeability parameter of the porous matrix. Compared with the inclined-plane bearing case, the stepped porous slider bearing provides an enhancement in the load-carrying capacity as well as a reduction in the friction parameter. An illustrative design example is also included for engineering and industrial applications.     

冷锻压力机肘杆尺寸误差对滑块运动精度的影响

分别采用理论和仿真分析了肘杆式冷锻压力机各杆长尺寸误差对滑块位置误差的影响规律,结果表明,两者近似呈线性关系。得到了对滑块位置误差影响程度较大的杆件,合理确定了杆件的尺寸公差。采用运动仿真研究了运动副间隙对滑块位置和速度的影响,提出了减小间隙的改进措施。     

行星齿环换向机构的加速度分析及参数优化

行星齿环机构换向时齿环滑块的加速度是评价该换向机构性能的关键指标。在分析行星轮与内齿环各段啮合情况的基础上,建立了该机构中齿环滑块的加速度分析模型,并在仿真计算的基础上讨论了机构参数对齿环滑块加速度的影响。以齿环滑块的起始点加速度及其加速度的变化范围最小为目标建立了行星齿环机构的优化数学模型,并给出了求解实例。     

精密冲床肘杆机构刚柔耦合模型的仿真分析

精密冲床肘杆机构是一种多杆件机构,在运动过程中各杆件均存在弹性变形。肘杆机构的杆件多,各杆件的弹性变形严重降低了冲床的线刚度指标和滑块最终的下死点精度。试图通过将机构中柔性大的构件视为柔性体,建立刚柔耦合模型,并采用该刚柔耦合模型进行ADAMS运动过程的动态仿真来分析影响肘杆传动机构刚度的关键因素,探索改善其刚度的有效措施。通过ANSYS对肘杆机构模型进行了静力学分析,寻找弹性变形最大,对运动输出精度影响最大的构件,将其视为柔性体,建立刚柔耦合模型并在ADAMS进行仿真分析,验证建立刚柔耦合模型的必要性并指导后期的拓扑优化设计。