一种新型简捷式疲劳裂纹修复仪概念设计（英文）

A new conceptual design of compact fatigue crack arresting device

疲劳是零件或结构失效的主要原因.为此设计了一种操作灵活的新型疲劳裂纹修复仪,其可通过可编程控制器和机械臂实现自动工作.纳米材料在低于零件或结构熔点的温度下被用以修复裂纹.裂纹修复仪主要由机身、手柄、相机、喷嘴和活塞组成.其利用激光作为热源,温度传感器对温度进行检测并对纳米材料流通道进行控制.来自外部光源的激光通过喷嘴中心孔照射到工件裂纹处,喷嘴中心孔被粉末通道的出口环绕,粉末出口的方向和激光的焦点重合,在激光加热工件之后喷上粉末,并在材料沉积工序之后进行压力冲击.距离传感器能够使修复过程随着裂纹的发现和探测来进行.本设计结构紧凑,原理简单,可以高效完成裂纹修复.

Fatigue is the major cause of component or structure failure.A novel crack arresting gun providing free operating flexibility to repair/arrest the fatigue crack is designed.It can be automatically operated by PLC control with a robot arm.The nano-material is applied at a certain temperature lower than melting point on local areas of structure or component to repair the crack.The crack arresting gun includes body,handle,camera,nozzle and piston assembly.In this device,the laser is used as heating medium and a temperature sensor enables the material flow after achieving the required temperature.Laser light from a remote source flows through the nozzle central aperture to treat a workpiece.The nozzle central aperture may be surrounded by powder channel outlets aligned upon a working focal point incident after the laser beam.The workpiece is sprayed with powder after heated by laser beam.The shocking pressure may follow the material deposition process.A distance sensor may enable the process of repairing operation according to the presence and detection of a flaw.The crack arresting could be done simply by its compactness and simple mechanism.Conceptual design of the compact crack arresting device gives a high degree of freedom for operating to repair.