共查询到19条相似文献,搜索用时 78 毫秒
1.
2.
3.
在比较冷弯型钢各种成型方法的基础上,制定了高速公路护栏板的成型工艺,并成功地进行了轧辊孔型及配辊设计。用该套辊系生产的护栏板, 其尺寸精度及表面质量完全满足了国标要求, 继在京石高速公路保定段使用后, 又在太旧高速公路得以应用, 为太旧路的建设作出了贡献 相似文献
4.
5.
冷弯型钢和焊管是广泛应用的型材,但其成型机理较难描述。针对实际冷弯成型轧制过程,为了更精准地进行应力应变分析,提出了轧制过程的动态链式模型,在样条有限条法的基础上,利用该模型研究实际轧制过程中结点与链的变形分析方法,给出链式结构结点的孔型应力应变数学描述式,并在此基础上给出了结点的智能结构。对每个结点和链建立对应的Agent,建立各Agent的知识规则,实现利用链式模型分析冷弯成型轧制过程的新方法。为建立新的复杂断面孔型设计算法提供理论基础。 相似文献
6.
7.
首先概括介绍了冷弯型钢辊轧成型工艺,其次着重阐述了一种电力二次设备机柜冷辊弯型钢结构设计,并进行了全面的刚强度计算分析,分析表明,此冷辊弯型钢完全满足性能需求,同时对采用此冷辊弯型钢加工的机柜进行静载荷及动载荷试验验证,从而在理论和实践上验证了此冷辊弯型钢的合理性和可行性,为今后电力二次设备机柜及冷弯辊轧类产品设计、制造提供了经验. 相似文献
8.
9.
10.
11.
近几年来,我国兴起了冷弯薄壁型钢结构住宅体系,冷弯薄壁型钢得到快速发展。基此,笔者采取试验、理论和有限元模拟分析相结合的方法,对冷弯薄壁C型钢梁的弯曲性能进行分析研究,从而得出冷弯薄壁型钢结构与传统的热轧钢相比,更具有良好经济性。 相似文献
12.
A theoretical analysis of load and flow characteristics of a capillary compensated oil-lubricated externally pressurized journal bearing having four rectangular recesses is presented. The analysis is based on an exact solution of the pressure distribution over the bearing sill area and has been made for two configurations of loading, through the centre of any recess and through the centre of the circumferential sill between any two recesses. The influence of circumferential sill length and intensity of compensation on the load carrying capacity and the flow requirement is shown. Theoretical analysis and experimental results are compared. 相似文献
13.
S. H. Chung W. L. Pearn Y. S. Yang 《The International Journal of Advanced Manufacturing Technology》2007,31(9-10):957-968
Many statistical methods applied to manufacturing quality control and operations management have been under the assumption that the process characteristic investigated is normally distributed. If the process characteristic is not normally distributed, a popular approach is to transform the non-normal data into a normal one. In this paper, we consider the Box-Cox transformation, and compare the transformation power using two different parameter estimation methods, including the maximum likelihood estimator (MLE) and the method of percentiles (MOP). The performance comparison is based on the pass rate under the Shapiro-Wilk normality test. The results show that, in general, the MOP has better pass rate, while the MLE has smaller power variation for most cases investigated. For small sample size (n=5, 10) both methods perform equally well. For large sample size, the MOP is recommended due to its simplicity and significantly higher pass rate. 相似文献
14.
15.
以应变式电子天平为研究对象,在分析电子天平震动信号的频谱特性及其对天平计量性能影响的基础上,提出一种基于梯度变步长最小均方(LMS)自适应滤波器的电子天平抗震动设计方法。依据天平称量数据的震动影响来源和特点,通过与切比雪夫低通滤波、椭圆低通滤波、巴特沃斯低通滤波及滑动平均滤波等常用抗震动滤波方法进行仿真实验对比,证明梯度变步长LMS自适应滤波算法的有效性与优越性,该方法在实际天平中得到应用。实验表明,采用本方法研制的200 g/0.001 g应变片电子天平可以在普通木质实验台上准确称重,最大称重误差≤0.001 5%,且不受榔头敲击实验台等冲击性震动的影响。 相似文献
16.
17.
M. Jafari M. Abbasi D. Poursina A. Gheysarian B. Bagheri 《Journal of Mechanical Science and Technology》2017,31(3):1135-1142
Welding dissimilar metals by fusion welding is challenging. It results in welding defects. Friction stir welding (FSW) as a solid-state joining method can overcome these problems. In this study, 304L stainless steel was joined to copper by FSW. The optimal values of the welding parameters traverse speed, rotational speed, and tilt angle were obtained through Response surface methodology (RSM). Under optimal welding conditions, the effects of welding pass number on the microstructures and mechanical properties of the welded joints were investigated. Results indicated that appropriate values of FSW parameters could be obtained by RSM and grain size refinement during FSW mainly affected the hardness in the weld regions. Furthermore, the heat from the FSW tool increased the grain size in the Heat-affected zones (HAZs), especially on the copper side. Therefore, the strength and ductility decreased as the welding pass number increased because of grain size enhancement in the HAZs as the welding pass number increased. 相似文献
18.
S型截面不锈钢钢丝成形工艺和模具设计 总被引:1,自引:0,他引:1
根据不锈钢材料强度高、硬化严重和S型横截面形状复杂、尺寸小的特点,确定采用两道次辊弯预成形、两道次辊模拉拔、一道次固模精拉的工艺方案,设计S型截面不锈钢钢丝五个道次成形工艺过程的轧辊孔型。此项研究成果对S型截面钢丝有重要的参考价值。 相似文献