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基于遗传算法的白车身焊接机器人焊点分配
白车身 多机器人焊接 遗传算法 背包问题
2010/4/6
分析了轿车白车身制造多机器人拼焊工位焊点分配问题的特征，将焊点与机器人抽象为空间点、以机器人运动时间的倒数为价值向量建立多背包问题数学模型，利用遗传算法进行求解。通过合理处理选择、交叉、变异遗传算子，算法具有良好的搜索性能和收敛性。侧围补焊工位焊点分配结果表明各机器人焊接任务均衡，节拍时间控制在要求范围之内。
Shifting Rule Modification Strategy of Automatic Transmission Based on Driver-vehicle-road Environment
shifting rule modification strategy fuzzy logic control simulation
2010/3/30
Accidental or frequent shift often occurs when the shifting rule is built based on traditional two parameters (i.e., velocity and throttle), because the speed of engine varies slower than change of th...
TA15钛合金电子束焊接接头不同区域的疲劳裂纹扩展行为研究
TA15钛合金 电子束焊接 显微组织 疲劳裂纹扩展
2010/2/1
对TA15电子束焊接接头的熔凝区和热影响区的显微组织、硬度、疲劳裂纹扩展速率、以及疲劳断口形貌进行了研究.结果表明:熔凝区的显微组织主要为粗针状α′马氏体组织,热影响区组织为α′马氏体组织+条片状的α相和β相,由接近熔凝区组织向母材组织过渡.母材的硬度较低,熔凝区平均硬度最高,热影响区的硬度介于两者之间.疲劳裂纹扩展速率高低与其显微组织密切相关,含塑性较好的片状α相较多的热影响区比熔凝区有较高的裂...
采用拉锻式摩擦塞补焊方法对4mm厚的2014铝合金搅拌摩擦焊接头缺陷进行了补焊,焊后对塞补焊接头的微观组织和拉伸性能进行了分析.研究结果表明,摩擦塞补焊接头分为焊缝区、热影响区和母材区三部分,焊缝由细小的等轴再结晶组织构成.选择合适的焊接参数和接头结构,塞补焊接头的抗拉强度可以达到330MPa以上,达到或超过搅拌摩擦焊接头强度.塞补焊接头微观硬度分析表明,塞补焊后接头焊缝区硬度较高,但整体硬度变化...
Vibration Analysis of Plates With Spot Welded Stiffeners
Stiffened Plates Spot Welding Residual Stresses
2009/12/30
In this work both theoretical and experimental investigation was carried out to study the effect of residual stresses on the vibrational characteristics of plates with spot welded stiffeners at differ...
A Finite Element Calculation of Stress Intensity Factors of Cruciform and Butt Welded Joints for Some Geometrical Parameters
Stress Intensity Factor FRANC2D Welded Joints
2009/12/30
With welded joints, stress concentrations occur at the weld toe and at the weld root, which make these regions the points from which fatigue cracks may initiate. To calculate the fatigue life of welde...
Lateral extrusion of tailor welded aluminum alloy pipes with a lost core of low temperature melting alloy
Tube forming Tailored blank Lateral extrusion
2009/12/14
Purpose: In this paper, the authors employ tailor welded aluminum alloy pipes for lateral extrusion process with a lost core to perform a hollow light-weight-part.
Design/methodology/approach: The pi...
Arc voltage behavior in GMAW-P under different drop transfer modes
Welding Arc voltage Drop transfer modes
2009/12/14
Purpose: Experimental measurements have been made to investigate meaning of the change in voltage for the pulse gas metal arc welding (GMAW-P) process operating under different drop transfer modes.
D...
GMAW process stability evaluation through acoustic emission by time and frequency domain analysis
GMAW Acoustic pressure Time domain
2009/12/14
Purpose: In the present work was made the comparative analysis in time domain and frequency domain to the acoustical pressure generate by the electric arc to determinate which of the two analysis meth...
Design of automatic vision-based inspection system for solder joint segmentation
Automatic PCB inspection Segmentation of solder joints Illumination normalization
2009/12/14
Purpose: Computer vision has been widely used in the inspection of electronic components. This paper proposes a computer vision system for the automatic detection, localisation, and segmentation of so...
Sn-Zn, Sn-Ag-Cu和Sn-Bi-Cu无铅焊锡合金与铜的润湿性
无铅焊料 润湿性 接触角
2009/12/11
采用静滴法对Sn-Zn, Sn-Ag-Cu, Sn-Bi-Cu锡基合金在铜基板上的润湿性进行了研究. 结果表明，Sn-Bi-Cu合金的润湿性良好，Sn-30Bi-0.5Cu合金在530 K时的接触角为26o，熔融的Sn-3Ag-0.5Cu共晶合金的接触角几乎不存在滞后性. 锡基合金中添加Bi元素可提高合金的润湿性，添加Cu元素可有效防止溶铜发生. 研究结果为无铅焊锡合金的应用提供了一定的理论依据....
EMN2010中韩微焊接技术论坛
EMN 2010 中韩微焊接技术 论坛
2009/12/9
面向电子行业的绿色环保微焊接技术即第四届中韩微焊接技术论坛将在2010年5月15日同期举行。邀请了知名专家、企业领导对“面向电子行业的微焊接技术研究进展”及“绿色环保型电子装联技术”展开研讨。诚邀各相关企业、院校、研究和生产单位参与!
Effect of flash butt welding parameters on weld quality of mooring chain
Welding Mooring chain Flash butt welding
2009/12/3
Purpose: The effects of flash butt welding parameters on mechanical properties were explored for mooring chain for offshore structure.
Design/methodology/approach: Through the tensile strength, impac...
Resistance spot welding of aluminum alloy sheet 5J32 using SCR type and inverter type power supplies
Welding Aluminium sheet metal Spot welding
2009/12/3
Purpose: A characteristic was compared and analyzed between the lobe diagram of SCR type resistance spot welding and that of inverter type resistance spot welding of the aluminum alloy sheet 5J32 for ...
Weldability of class 2 armor steel using gas tungsten arc welding
Gas tungsten arc welding Welding parameters optimization Armor steel
2009/12/2
Purpose: In this study, microstructural and mechanical evaluations of class 2 armor steel after single-pass and
pre-heated/single-pass welding were investigated to reveal the effect of pre-heating on...