The purpose of rolling element flaw detection is to detect possible defects or cracks inside the rolling element, determine the direction, size, distribution and degree of its material and manufacturing defects, so as to eliminate hidden dangers in advance and ensure the safety and reliability of the subsequent use of the rolling element.
The specific methods of flaw detection include the following: Magnetic particle flaw detection: Using the principle of electromagnetics, the surface of the ferromagnetic workpiece is formed with an electromagnetic field through a magnetizing current. The defects will cut off the magnetic lines of force to form a leakage magnetic field and adsorb magnetic powder. The existence of defects is determined by observing the magnetic traces formed by the accumulation of magnetic powder. This method is suitable for detecting linear discontinuous defects on the surface and sub-surface, but can only be used for ferromagnetic materials and is limited to the flaw detection of surface defects. Penetrant color flaw detection: The flaw is revealed by the developer after the penetrant penetrates the flaw, which is suitable for detecting welding quality and other surface defects. This method is easy to operate and suitable for various materials, but it cannot detect sub-surface defects, and the surface must be clean and oil-free. Ultrasonic flaw detection: Using the principle of ultrasonic reflection, the ultrasonic wave penetrates into the workpiece when the probe touches the surface of the workpiece, and is reflected and fed back to the screen of the flaw detector after hitting the defect, showing the location and size of the defect. Ultrasonic flaw detection is accurate and efficient, and is suitable for testing workpieces with high technical requirements.
