Adhesion Model and Shedding Limit's Identification of the Oxide Film on the Surface of ELID Grinding Wheel

Abstract

The adhesion property of oxide film has great effects on the grinding quality and efficiency of ELID grinding. In this paper, adhesion strength model of oxide film is established, ELID grinding is conducted to nanometric cemented carbide and ordinary cemented carbide, ELID grinding force is measured, adhesive stress is calculated and the correctness of adhesion model is verified. The results show that the adhesion strength of oxide film is relatively greater, the transition from γ-Fe2O3to α-Fe2O3in the oxide film is relatively fuller and the polishing performance is relatively better while the grinding depth is smaller; with the deepening of grinding, the adhesion strength of oxide film reduces, the composition of the oxide film that transforms into α-Fe2O3is less and the polishing ability reduces. The adhesion model of oxide film well reflects the adhesion property of oxide film, and the application of this model can represent the distribution, shedding and updating of the oxide film on the surface of grinding wheel.

Model of ELID Grinding Material Removal Rate

“…Under the effect of grinding heat generated in ELID grinding process, the composition of the oxidation film on the surface of iron-based wheel surface changes, generating α-Fe 2 O 3 of particle size in the nanoscale which covers around the diamond particles [5,6], and forming composite abrasive particles centering on the diamond abrasive particles surrounded by α-Fe 2 O 3 , thus the number of particles that actually participate in cutting should be equal to the sum of diamond abrasive particles and α-Fe 2 O 3 abrasive particles generated after change. This number should be much larger than the number of diamond abrasive particles in traditional grinding.…”

Measurements on grinding wheels for investigating α-Fe2O3 in precision electrolytic in-process dressing grinding

“…7 We have focused on process parameters of ELID grinding that recognize the grinding depth factor on the adhesiveness of the oxide films. 8 In addition, Kersschot et al 1,9 have studied several process parameters such as electric double layer, electric resistance, growth speed of oxide films, including provided power, electrolyte, speed of wheel, and abrasive grain. ELID grinding has offered a way to obtain better process stability and material removal rate by comparing with traditional grinding depth.…”

Theoretical modeling and experiments of oxide layer contact stiffness for ultrasonic vibration–assisted electrolytic in-process dressing grinding

“…Using laser displacement sensor and eddy current gap sensor, Wang et al 18 invented an online method for measuring the oxide layer thickness directly. Kuai 19 established the adhesion strength model of oxide layer, which can reflect the adhesion property of oxide layer and present the distribution, shedding, and updating of the oxide layer on the surface of grinding wheel very well.…”