Ultrasonic ELID composite grinding critical depth prediction method considering online electrolysis effect

The invention relates to the technical field of precision machining, in particular to an ultrasonic ELID composite grinding critical depth prediction method considering an online electrolysis effect. Comprising the following steps that S1, a change curve is established according to the process that the radius of a single abrasive particle of a grinding wheel is continuously increased from exposure to falling in ultrasonic ELID composite grinding, and a radius change model of the single abrasive particle of the grinding wheel in the ultrasonic ELID composite grinding is established; s2, diamond abrasive particles with any radius on the curve are selected to be subjected to an ultrasonic ELID variable cutting depth scratch test, and the brittle-plastic transformation critical depth of the material is obtained; s3, the step S2 is repeated, the abrasive particles with different radiuses are used for testing, a curve of the brittle-plastic transformation critical depth changing along with the radiuses of the abras