小间隙圆角刃口精冲模设计制造

设计了一种小间隙圆角刃口精冲模,连续自动方式送料,对侧滑板小间隙圆角刀口精冲模的结构进行了剖析,总结了模具结构及零件设计制造要点。     

尾矿库老化程度评价研究

通过对尾矿库老化现象和其机理的研究,提出了尾矿库老化评价体系及评价的方法,并对该技术特性进行了分析,从中得出一些有参考价值的结论,也指出了该技术存在的一些不足之处。     

国产CODECASE2115小口径管焊接接头性能研究

依据国产CODECASE2115小口径管材的成分和性能,合理选择了焊接材料和焊接工艺,并对焊接接头进行试验与分析,验证了可以获得合格焊接接头的相应的焊接材料和焊接工艺,实现了超超临界锅炉中耐热钢管国产化材料的焊接工艺,扩大了耐热钢管及焊接材料的供货方范围,且国产的CODECASE2115奥氏体钢管与国外同类材料相比,价格与供货期都更有优势,也为这种材料在超超临界机组中的应用积累了试验数据。     

细化变质处理对铸造A356铝合金组织性能及共晶硅生长机制的影响

研究了采用新型Al-5Ti-1B-1RE中间合金和Al-10Sr中间合金对A356铝合金进行单一或复合细化变质处理后的组织、力学性能和共晶硅生长机制的影响。结果表明：单一细化变质处理中Al-5Ti-1B-1RE中间合金对A356铝合金中α-Al相有明显的细化作用,合金的强度和维氏硬度显著提高;Al-10Sr 中间合金对共晶硅有强的变质作用,合金的伸长率明显提高;而经复合细化变质处理后α-Al相形状和尺寸变得更均匀细小,晶界更清晰,共晶硅相几乎都转变成更弥散、更细小的纤维状,片层状共晶硅也几乎完全消失,共晶硅长度由铸态40-60 μm降低到1-2 μm之间,达到完全变质效果,其力学性能显著高于铸态、单一细化变质剂处理的A356铝合金。未细化变质的A356铝合金中的共晶Si的生长方式为典型的小平面台阶生长,复合细化变质处理的共晶硅以孪晶凹槽机制生长为主,小平面生长特征逐渐减弱直至消失。     

基于Canny边缘检测算子和去除小物体算法的熔池图像处理

采用基于Canny边缘检测算子和形态学去除小物体算法提出了一种新的熔池图像处理算法．首先对熔池的图像所具有的一些特性进行分析，然后对图像分别做中值滤波，二值化，边缘检测，和去除小物体处理。实验结果表明，该方法能够比较有效地得出熔池图像的边缘。     

Assessment of fracture characteristics from revised small punch test using pre-cracked specimen

Small punch (SP) test has been utilized to analyze the neutron irradiation damage of nuclear vessels. Since this technique is easy, simple, and nondestructive, it can be applied to evaluate the mechanical properties and material degradation of in-service components. Conventional SP test has evaluated the ductile-brittle transition temperature and the equivalent fracture strain by the interpretations of load-deflection curve and the change of specimen thickness, respectively. The assumption that fracture occurs at maximum load is, however, not reasonable because the crack initiates at smaller load. In this study, in order to evaluate quantitatively fracture characteristics based on fracture mechanics, the pre-crack is introduced to SP specimen and acoustic emission is used to determine the crack initiation point. Using the load at crack initiation point, the fracture toughness of thin plate is calculated through bending theory. Therefore, the fracture characteristics of thin plate can be evalualed more reliably by using revised SP test.     

小口径合金耐热钢管焊接操作技术

针对本厂产品小口径合金耐热钢管对焊接缝中出现的焊接缺陷，从操作技术入手，对产生原因进行分析，试验，提出了防止焊接缺陷的措施，采用合适的焊接工艺及操作技术后，可大大减少该类材料焊接缺陷的产生。     

Image segmentation of small defects in precision weldments with complex structure

In this paper, the X-ray nondestructive test method of small defects in precision weldments with complex structure was presented. To resolve the difficulty of defect segmentation in variable grey image, the image processing based on Visual Basic programming method was adopted. The methods of automatic contrast and partial grey stretch were used to enhance the X-ray detection image which has relatively low contrast, then automatic threshold method was carried out to segment the two high intensity zones, and weld zones which contain the small defects was extracted. Smoothing and sharpen processing were proceeded on the extracted weld zones, and small defects in X-ray detection image of weldments with complex structure were segmented by using the method of background subtraction in the end. The effects of raster were eliminated, and because of that the image processing was only proceeded on the extracted weld zones, the calculated speed using the above provided algorithm was improved.     

可控挤压油膜阻尼器—转子系统主动控制试验

通过调节可控挤压油膜阻尼器（ＣＳＦＤＢ）的结构参数（油膜间隙、油膜承载长度）,使其产生的非线性油膜力逼近线性转子系统所需的控制力,可以有效地控制转子系统的不平衡响应。试验研究了可控挤压油膜阻尼器（ＣＳＦＤＢ）对转子系统振动的主动控制,并取得了良好的控制效果。     

基于变形控制标准的高土石坝地震可靠度分析

基于可靠度分析的设计方法是科学定量地研究和保证岩土工程安全性的重要手段之一。通过定量考察土石坝工程中的不确定性因素,综合评估地震失效概率,可为高土石坝抗震设计和风险评估提供参考。以坝顶震陷率作为地震安全控制指标,提出了同时考虑地震和筑坝料参数不确定性的高土石坝地震可靠度分析方法。首先,采用地震烈度作为地震危险性的宏观衡量尺度,通过引入地震烈度概率模型,将基于概率烈度的地震动峰值作为地震强度因子,调整规范谱人工地震波的幅值进行动力有限元计算。然后,采用适用于处理小样本和非线性问题的高斯过程响应面法,建立筑坝料参数与坝顶震陷率之间的非线性映射关系,结合蒙特卡罗法计算高土石坝地震失效概率。最后,以紫坪铺面板堆石坝为例,应用该方法考察了设计基准期内的地震失效概率。