基于SolidWorks工程图中旋转局部剖视图的表达方法研究

研究了利用SolidWorks由三维模型生成二维工程图中存在的问题,对于由平行剖切面、相交剖切面复合剖切获得的局部剖视图给出了一种解决方法。     

基于2维设计的管线空间布局信息表达方法及其应用研究

提出用截切面映射图的方法来表达基于2维设计环境的管线空间布局信息，首先对管线实体在2维环境下的模型描述方式进行改进，使其含有完备的3维信息，然后通过交互设计出具有简单描述方式的虚拟截切面，并对管线图中任意位置的管线施加剖切操作，最后通过对截切面与各管线实体的虚拟求交来获取该剖切面上的管线截面分布图（即截切面映射图）及其相关信息，进而映射出相应的管线空间布局状态，实际应用表明，该方法可以较好地解决2维布管设计中的3维信息表达问题，提高了信息表达的直观性。     

复杂型腔的行切加工

介绍一种复杂型腔的行切加工方法，该方法将型腔加工区域分解为沿行切面法线单调的区域集合通过加工各单调区域而实现对复杂型腔的加工。提出一种基于图论的复杂区域单调剖分算法。算法在型腔加工区域边界凹极值点处于加工区域进行部分，将剖分过程对应于一个有向图的生成过程，通过求解图的基本回路而获得单调剖分区域。同时研究了型腔行匠另一重要问题－－行切方向的选择。基于剖分区域数与边界凹极值九成线性关系这一结论，通过计     

新机械制图国家标准介绍 第五讲 图样画法(GB 4458.1—84)

(二) 9.剖视和剖面有什么区别? 剖视假想用剖切面剖开机件,将处在观察者和剖切面之间的部分移去,而将其余部分向投影面投影所得的图形。剖面假想用剖切面将机件的某处切断,仅画出断面的图形。剖切有各种形式,如单一剖切面、两相交的剖切平面、几个平行的剖切平面等。     

原切面算法及其应用

介绍了求解正定几何规划的原切面算法，通过分析原切面的几何特征说明该算法的优越性，并通过变量代换和函数近似转换将该算法推广应用到多目标优化设计中。     

在AutoCAD中快速绘制轴测剖视图的研究

根据正投影图和剖视图，在AutoCAD中不用复杂的坐标变换，也不用繁琐的UCS系统及实体造型，仅用一些常用的工具即可实现轴测剖视图的快速绘制。文章介绍了几种常见剖视图的轴测剖切画法，方法新颖、操作简便，充分发挥了AutoCAD的优越性，是在二维环境下快速绘制三维图样的一种突破与创新。     

基于SolidWorks工程图中肋板的表达方法研究

SolidWorks具有强大的三维模型设计功能,能方便地由三维模型生成各种二维工程图,但对于带有肋板的零件模型在沿肋板纵向剖切面剖切生成剖视图时,肋板的剖切断面与其相邻部分没有分界线隔开,肋板的断面也画上了剖面线,这些都不符合国家标准。本文就这方面的问题给出了两种解决的方法,实现了对SolidWorks二维工程图的标准化处理。     

叶切面最大厚度的数值计算方法

叶切面最大厚度计算是螺旋曲面加工准备过程中必要的环节.探讨适合于叶切面最大厚度的数值计算方法.详细介绍叶切面厚度数值计算所包括的叶切面最大厚度区域搜索、叶切面最大厚度精确计算过程.     

叶切面最大厚度数值计算与应用

以叶切面最大厚度的数值计算方法为基础,探讨叶切面最大厚度计算的计算机实现,介绍叶切面厚度数值计算法的应用实例.     

剖分式轴承在离心鼓风机改造中的应用

分析了在离心鼓风机上采用剖分式滚动轴承代替轴瓦的优点;详细叙述了剖分式滚动轴承的安装以及弹性套柱销联轴器的找正、调整过程;总结了C300-1.387/0.837离心鼓风机由轴瓦改造为剖分式滚动轴承的成功案例,该技术可在类似产品上大力推广应用,是一种经济效益较高的改造方式。     

金属切削刀具后刀面的切削热研究

在以往的金属切削热研究中,认为刀具后刀面处产生的切削热很小而被忽略。文章应用平面热源法,建立了刀具后刀面与工件摩擦面的切削热模型,推导了该摩擦面的切削热分配和切削温度理论计算公式,对影响后刀面切削热的主要因素进行了分析。研究结果表明,当刀具后刀面磨损带宽度达到一定程度时,则刀具后刀面处产生的切削热不能忽略。     

数控加工中复杂零件的快速建模技术

对复杂平面切割类零件进行结构特征分类和分析,通过切割结构的快速定体、定形和定性,探讨复杂切割类零件快速建模方法和途径,提出斜孔、斜槽在建模时的定位基准建立方法,适用特征造型的三维设计平台中的模具切割类零件的CAD/CAM建模.     

多维测力仪扰力解耦算法研究

多维测力仪各向力之间的干扰是影响测量精度的主要决定因素之一。从测力仪标定数据处理分析的角度，提出了一种基于测力仪标定线性回归直线方程的解耦算法，并用Matlab进行解耦运算。研究结果表明：采用解耦算法，可有效地减小多维测力仪各向之间的扰力误差，提高测力仪的测量精度。     

Mill-cut: a neural network system for the prediction of thermo-mechanical loads induced in end-milling operations

This paper presents the design and implementation issues of a generalized system called mill-cut, developed for the prediction of cutting forces and temperature in end-milling operations. Based on an ANN approach, mill-cut predicts all the three components of cutting forces and average shear plane temperature for a given set of machining parameters broadly categorized into three groups viz. (i) cutting tool geometrical parameters (ii) cutting parameters and (iii) workpiece material properties. In the present work, for representing overall machining condition, 15 machining parameters having major impact on the cutting forces and cutting temperature were chosen. The feed-forward back-propagated ANN architecture has been incorporated, which was initially trained with analytical data before incorporating it as part of an integrated system. Results obtained from the proposed model show good agreement with the experimental/numerical (FEM based) results available in the literature.     

SPDT超精密切削时切削变形与切削力的研究

研究了超精密切削时，单晶金刚石刀具与工件间的摩擦系数、刀具锋锐度、切削厚度等对切削变形系数、切削力及加工表面质量的影响。作者认为在超精密切削时，要提烹加工表面质量，优选金刚石刀具的晶面方向、提高金刚石刀具的锋锐度是十分重要的，在超精密切削单晶材料时，工件晶面的选择也是十分重要的。     

Micro cutting of tungsten carbides with sem direct observation method

This paper describes the micro cutting of wear resistant tungsten carbides using PCD (Poly-Crystalline Diamond) cutting tools in performance with SEM (Scanning Electron Microscope) direct observation method. Turning experiments were also carried out on this alloy (V50) using a PCD cutting tool. One of the purposes of this study is to describe clearly the cutting mechanism of tungsten carbides and the behavior of WC particles in the deformation zone in orthogonal micro cutting. Other purposes are to achieve a systematic understanding of machining characteristics and the effects of machining parameters on cutting force, machined surface and tool wear rates by the outer turning of this alloy carried out using the PCD cutting tool during these various cutting conditions. A summary of the results are as follows : (1) From the SEM direct observation in cutting the tungsten carbide, WC particles are broken and come into contact with the tool edge directly. This causes tool wear in which portions scrape the tool in a strong manner. (2) There are two chip formation types. One is where the shear angle is comparatively small and the crack of the shear plane becomes wide. The other is a type where the shear angle is above 45 degrees and the crack of the shear plane does not widen. These differences are caused by the stress condition which gives rise to the friction at the shear plane. (3) The thrust cutting forces tend to increase more rapidly than the principal forces, as the depth of cut and the cutting speed are increased preferably in the orthogonal micro cutting. (4) The tool wear on the flank face was larger than that on the rake face in the orthogonal micro cutting. (5) Three components of cutting force in the conventional turning experiments were different in balance from ordinary cutting such as the cutting of steel or cast iron. Those expressed a large value of thrust force, principal force, and feed force. (6) From the viewpoint of high efficient cutting found within this research, a proper cutting speed was 15 m/min and a proper feed rate was 0.1 mm/rev. In this case, it was found that the tool life of a PCD tool was limited to a distance of approximately 230 m. (7) When the depth of cut was 0.1 mm, there was no influence of the feed rate on the feed force. The feed force tended to decrease, as the cutting distance was long, because the tool was worn and the tool edge retreated. (8) The main tool wear of a PCD tool in this research was due to the flank wear within the maximum value of V_max being about 260 μ.     

一种新的剪切装置的设计

在总结引信剪切装置不足的基础上,指出了其根本原因一剪切面在运动副的运动面上,并转换设计思路,设计了横向不等径、弹簧式和剪切销式剪切装置,分析了其优劣,介绍了最优的剪切销式剪切装置的剪切销设计过程,简单提到了剪切装置的应用.     

Improved dynamic cutting force model in ball-end milling. Part I: theoretical modelling and experimental calibration

An accurate cutting force model of ball-end milling is essential for precision prediction and compensation of tool deflection that dominantly determines the dimensional accuracy of the machined surface. This paper presents an improved theoretical dynamic cutting force model for ball-end milling. The three-dimensional instantaneous cutting forces acting on a single flute of a helical ball-end mill are integrated from the differential cutting force components on sliced elements of the flute along the cutter-axis direction. The size effect of undeformed chip thickness and the influence of the effective rake angle are considered in the formulation of the differential cutting forces based on the theory of oblique cutting. A set of half immersion slot milling tests is performed with a one-tooth solid carbide helical ball-end mill for the calibration of the cutting force coefficients. The recorded dynamic cutting forces are averaged to fit the theoretical model and yield the cutting force coefficients. The measured and simulated dynamic cutting forces are compared using the experimental calibrated cutting force coefficients, and there is a reasonable agreement. A further experimental verification of the dynamic cutting force model will be presented in a follow-up paper.     

激光切割钢板Z轴全程随动路径研究

采用SLCM-1225数控激光切割机切割碳钢板,在保证切割质量的前提下,对切割路径进行了研究。通过分析激光切割碳钢板的特点,提出切割行程中的空程应包括处在数控状态下的Z轴行程,因此,XY平面内的最短行程可能不是切割效率最高的行程。为此,提出了一种Z轴全程随动的切割方法,并通过对同一切割图形的几种不同切割路径、切入点以及空程轨迹的分析比较,给出了可采用Z轴全程随动进行切割的空程路径所必须满足的条件,同时也为Z轴全程随动切割法的切割路径设计提供了一种可行的设计思路。试验结果表明,在切割质量不低于传统切割路径设计方案的基础上,Z轴全程随动切割法能使工作效率平均提高60%以上。在工业生产中,Z轴全程随动切割方法具备可操作性和推广价值。     

切削加工尺寸精度模糊智能控制的研究

针对金属切削加工中影响工件尺寸精度非线性因素众多 ,精确数学模型难以建立的特点 ,提出尺寸加工精度控制的模糊智能化方法 ,设计了自寻优模糊控制器 ,实现了工件尺寸精度在线智能监控。仿真试验结果表明 ,这种控制器具有很好的鲁棒性 ,获得了满意的控制效果。