基于机器视觉的气门杆几何参数测量方法研究

文章给出了机器视觉系统的基本组成及高精度视觉测量的实施对策,并以气门杆几何及形位参数检测为例,讨论了图像的采集、处理及达到亚像素边缘检测精度的软件设计,通过LOG算子、最小二乘线性估计等手段,使直线边缘定位精度达到亚像素级,在不增加硬件成本的前提下,达到了检测参数的精度设计要求.     

汽车发动机双质量飞轮激光焊接机及其工艺研究

对汽车发动机双质量飞轮激光焊接机及其工艺进行了研究,取得了最佳焊接工艺参数,讨论并分析了各工艺参数及其它因素对激光焊接质量、性能的影响。     

IN SITU GRADIENT DOUBLE-LAYER COMPOSITES OF Al-Fe ALLOY BY CENTRIFUGAL CASTING

ＩＮＳＩＴＵＧＲＡＤＩＥＮＴＤＯＵＢＬＥＬＡＹＥＲＣＯＭＰＯＳＩＴＥＳＯＦＡｌＦｅＡＬＬＯＹＢＹＣＥＮＴＲＩＦＵＧＡＬＣＡＳＴＩＮＧ①ＷａｎｇＱｕｄｏｎｇ，ＪｉｎＪｕｎｚｅＲｅｓｅａｒｃｈＣｅｎｔｅｒｏｆＦｏｕｎｄｒｙＥｎｇｉｎｅｒｉｎｇ，Ｄａｌ...     

双层铸件铸造工艺的试验与应用

采用分隔砂芯，可在一个铸型内制作两层铸件，明显提高了生产率。计算机模拟表明，这种工艺方法还可以降低铸件冷却速度。通过调整隔件用的砂芯厚度，可以将铸件原来很小的补缩通道扩宽，使冒口真正发挥补缩作用，解决了缩松问题。     

大变形零件温挤压凹模型孔设计技巧

对大变形程度、圆坯正挤压出两种变截面挤压方式进行了工艺和质量对比，在凹模型孔形式上采用了双锥角模口导流方式，第一次提出了在挤压初始阶段，利用双锥角形成大的材料初始流速和流动惯性来克服流动前期变形抗力峰值以达到模口材料周边匀速流动目的的理论。     

埋弧自动焊工艺参数对焊缝成形质量的影响

为了研究焊接参数对单面焊双面成形尺寸的影响规律，通过对16Mn板厚6、8、10、12mm材料的试验，确定了其单面焊双面成形的最佳参数，并找出焊接参数变化对单面焊双面成形尺寸的影响规律。16MnR是一种应用十分广泛的材料．而其中8～12mm厚度的材料是最常用的，因此对工业生产具有很好的指导作用。     

热带粗轧机组立轧稳定轧制变形规律的实验研究和有限元分析

本文采用铅作为模拟材料，对热带粗轧机组平辊立轧变形规律进行了实验研究，得到了表征立轧稳定轧制阶段时轧件断面特征的四个参量与侧压量、立辊直径、板坯来料厚度及宽度之间的关系。并首次提出用超薄单元近似处理奇异点的新方法，采用全三维刚塑性可压缩有限元法对立轧稳态过程进行了理论解析，所得结果和实验结果符合较好。     

A new thermomechanical model of cutting applied to turning operations. Part I. Theory

In this paper, an analytical approach is used to model the thermomechanical process of chip formation in a turning operation. In order to study the effects of the cutting edge geometry, it is important to analyse its global and local effects such as the chip flow direction, the cutting forces and the temperature distribution at the rake face. To take into account the real cutting edge geometry, the engaged part in cutting of the rounded nose is decomposed into a set of cutting edge elements. Thus each elementary chip produced by a straight cutting edge element, is obtained from an oblique cutting process. The fact that the local chip flow is imposed by the global chip movement is accounted for by considering appropriate interactions between adjacent chip elements. Consequently, a modified version of the oblique cutting model of Moufki et al. [Int. J. Mech. Sci. 42 (2000) 1205; Int. J. Mach. Tools Manufact. 44 (9) (2004) 971] is developed and applied to each cutting edge element in order to obtain the cutting forces and the temperature distributions along the rake face. The material characteristics such as strain rate sensitivity, strain hardening and thermal softening, the thermomechanical coupling and the inertia effects are taken into account in the modelling. The model can be used to predict the cutting forces, the global chip flow direction, the surface contact between chip and tool and the temperature distribution at the rake face which affects strongly the tool wear. Part II of this work consists in a parametric study where the effects of cutting conditions, cutting edge geometry, and friction at the tool–chip interface are investigated. The tendencies predicted by the model are also compared qualitatively with the experimental trends founded in the literature.     

热带粗轧机组立轧变形规律研究

以铅为模拟材料，对热带粗轧机组平辊立轧变形规律进行了实验研究，分析了稳定轧制阶段表征立轧时轧件断面特征的４个参量，及非稳定轧制阶段头、尾部最大狗骨高度非稳定行为，失宽行为，鱼尾长度与立辊直径、侧压量、板坯来料厚度及宽度之间的关系，并建立了新的数学模型．     

低压差压调压一体化反重力铸造装备技术研究

低压铸造、差压铸造及调压铸造等反重力铸造装备技术已在实际生产中得到广泛应用,但多数此类设备功能单一,无法在同一台设备上实现多种功能。本文作者通过对设备主体、多功能气路控制系统、电控系统的结构设计,以及高性能数字式组合阀及相关控制软件等关键技术的研发,完成了低压铸造、差压铸造及调压铸造一体化反重力铸造装备技术的研究。生产实践证明,该装备技术不仅可满足多元化铸件产品的研制与生产,且具有压差控制精度高、操作安全可靠等特点。