共查询到20条相似文献,搜索用时 140 毫秒
1.
在对滚压成形机送辊机构进行运动和尺寸分析的基础上,按完成送辊运动所需的最大输入驱动力最小原则进行了机械的优化设计,在满足送辊机构预定要求的前提下有效地改善了有机构的传力特性。 相似文献
2.
3.
4.
5.
轧辊磨床辊形轮廓曲线生成方法研究 总被引:1,自引:0,他引:1
在轧辊的磨削过程中,复杂辊形轮廓曲面的形成是一个难题。在轧辊磨床中都设计有一个中高机构,辊形轮廓曲面的生成就是通过这个中高机构来实现的。论文重点从机械结构方面分析和比较了目前国内外轧辊磨床辊形轮廓曲线的生成方法,在此基础上提出了两种曲线的生成方法,并在计算机上进行了原理性仿真,结果表明这些方法在理论上是可行的。 相似文献
6.
7.
辊轮导槽导向式滚切剪剪切机构优化设计系统 总被引:1,自引:1,他引:0
分析了滚切剪剪切力峰值的产生原因,对辊轮导槽导向式滚切剪进行了介绍,并对剪切力公式的选取进行了分析,在此基础上构建了集成剪切机构优化设计与设计验证于一体的剪切机构优化设计系统.并对该软件系统进行了可行性验证,通过验证结果,证明了辊轮导槽导向式装置在克服剪切力峰值和提高剪切质量等方面的优越性.该系统为实现滚切剪的优化设计提供了方便快捷的设计手段. 相似文献
8.
在对滚压成形机送辊机构进行运动和尺寸分析的基础上,按完成送辊运动所需的最大输入驱动力最小原则进行了机构的优化设计,在满足送辊机构预定要求的前提下有效地改善了机构的传力特性 相似文献
9.
10.
本文在K.N.shohet等人提出的四辊轧机辊缝计算方法——影响函数法的基础上,针对六辊轧机的非对称结构,对其辊系变形做了分析,提出了计算辊缝的方法,得出了轧后带材平直度函数。对推广HC、UC轧机,对板形控制很有意义。 相似文献
11.
12.
针对冗余驱动并联机构的驱动力优化,提出冗余驱动并联机构的位移协调模型,该模型考虑了各驱动臂的弹性变形和执行机构的位移。研究全位置控制、混合位置/力控制和全力控制3种控制方法在冗余驱动并联机构的力学特性,分析每种控制方法中驱动力/力矩、作动器位移、外载荷和驱动臂刚度之间的相关性,揭示了不同控制方法下输入位移和驱动臂刚度对力分布的影响规律。最后通过冗余驱动并联机构的实验平台,对3种控制方法进行了验证,并探讨了3种控制方法在不同工况下的应用。 相似文献
13.
Electromagnetic Acoustic Transducers (EMATs) are widely used in Nondestructive Evaluation (NDE) of metals, including the inspection of ferritic steels. Optimization of EMATs in ferromagnetic materials is often accomplished using computational simulations that account for the three main types of transduction mechanism, namely the effects of Lorentz forces, magnetization forces, and magnetostriction. The extensive literature on the Lorentz and magnetization mechanisms of EMATs has been historically scattered with alternative notations causing conflicting interpretations of the fundamental governing equations that often led to erroneous implementations of these equations in computational simulations. The purpose of this paper is to clarify this issue. The confusion is caused by the arbitrary nature of the separation of electromagnetic transduction force into Lorentz and magnetization components. This paper shows that apparently contradicting models are actually equivalent if the Lorentz and magnetization forces are chosen to correctly match each other, while mixing otherwise acceptable but mutually incompatible terms leads to unacceptable modelling errors. This paper also provides guidelines for the implementation of these transduction mechanisms in computational models for EMATs. 相似文献
14.
It is well known that the shape and volume of the workspace are one of the greatest weaknesses of parallel kinematic machine tools (PKM). Hexaglide and Triaglide mechanisms are examples where workspace extension is achieved by elongating one axis as a principal motion axis that is a common feature of all Cartesian machines. With the idea of principal axis of motion in mind, a new 3-DOF spatial parallel mechanism for horizontal and vertical milling machines has been developed. In comparison with similar developed mechanisms it has several advantages such as: rather regular shape of the workspace (slightly modified block) similar to serial machines; greater stiffness by nature of the struts arrangement; good force and speed ratio through the entire mechanism's workspace. The paper describes the structure of the mechanism, modelling approach and simulation on a developed vertical milling machine prototype. 相似文献
15.
The effect of nanocrystallization on the selective oxidation and adhesion of Al2O3 scales 总被引:1,自引:0,他引:1
Fuhui Wang 《Oxidation of Metals》1997,48(3-4):215-224
Many mechanisms for the effect of reactive elements on the selective oxidation and scale adhesion of alloys have been proposed. However, nanocrystallization (or microcrystallization) has recently been found to have almost the same effect as that of reactive elements. This note reviews the effect of nanocrystallization on the selective oxidation and adhesion of Al2O3 scale with particular reference to the author's own results. 相似文献
16.
17.
硫酸盐还原菌微生物腐蚀研究进展 总被引:18,自引:2,他引:18
本文简单介绍了硫酸盐还原菌(SRB)引起的微生物腐蚀(MIC)的各种机理、环境因素引起的SRB的生长与变异及SRB腐蚀防控措施的研究进展。 相似文献
18.
19.
针对自动锻压机设计中切断凸轮出现噪声或整个机构尺寸偏大现象,根据曲柄滑块及直线凸轮的特性,建立关联表达式。应用MatchCAD软件强大的计算能力,绘制出凸轮运动位移及加速度曲线图,找到最大加速度,计算出所需惯性力,为今后设计提供指导和借鉴。 相似文献