Research On Nondestructive Testing Method And Automatic Detection Technology Of Brake Disc Flaw Detector

The performance of brake disc is an important factor that affects the safe operation of vehicles.Nondestructive testing of new or used brake discs is the key to ensuring vehicle safety.Magnetic particle testing is selected as the testing method of the equipment.The existing fluorescent magnetic flaw detector is mostly semi-automatic equipment,and most of these devices require workers to confirm the presence of cracks in fluorescent magnetic particles.As a result of human and environmental factors of the factory,manual detection affects the accuracy of detection and the health of workers.Therefore,it has a profound impact to development a set of automatic brake disc flaw detector to improve the working environment,the detection accuracy of the brake disc,and ensure product quality.In this paper,the structural design and testing methods of the equipment are analyzed.First of all,the types and development of nondestructive testing methods are briefly introduced.On this basis,the various methods are compared,and the advantages of magnetic particle testing in brake disc detection are obtained.The industrial camera is used to extract the cracks in the magnetic field in the darkroom,using computer for defect detection,which eliminates the need for manual detection of this link,to achieve the goal of fully automated.Design the equipment as required,based on the principle of magnetic particle testing,magnetic field,current and voltage are selected.Select the appropriate current in a wide variety of currents;In the case of determining the magnetizing current,understand the classification of magnetization methods and the characteristics of various magnetization methods,,the central conductor method combined and coil method is selected in the detection of brake disc;the magnetizing current and the magnetic field of the magnetizing device are determined according to the corresponding magnetization criterion.Improve the disadvantages of the original magnetizing device to overcome the drawbacks of multi-mode magnetization,And use SolidWorks to model it.Secondly,in order to overcome the defects of low efficiency and low detection accuracy,as well as the UV caused by the detection of health problems caused by ultraviolet radiation in the original equipment,the machine vision is used instead of the manual detection.Using the computer to extract the magnetized fluorescence picture,and then pretreatment and defect identification,to determine whether the brake disc has a quality problem.Compared with the gradient method and threshold method,on the basis of the original,this paper propose a composite threshold analysis method with faster detection and higher precision.The method is verified to prove the feasibility of this method.Finally,the detection speed and precision of the algorithm are compared with gradient method and threshold method.Finally,the key components of the device is deigned,the suitable structure of the device is selected among many structures.Using SolidWorks to design the device to make it suitable for different specifications of the brake disc needs.Modeling in SolidWorks,importing in Adams for simulation,the displacement of the manipulator's clamping end,the displacement,torque,driving force,and angular velocity of the associated joint are obtained.Based on these data,the final model is established in SolidWorks.