Friction Coefficient of Nano-Ceramic Polished by Oxide Film on ELID Grinding Wheel

Advances in Mechanical Engineering

2018

Electrolytic in-process dressing grinding holds tremendous promise for ultra-precision grinding on hard and brittle materials. Besides oxide films on the grinding wheels, it is important to study the content generation and transformation of a-Fe 2 O 3 inside the oxide film and its effect on polishing process. In this study, X-ray diffractometer measurement was performed in electrolytic in-process dressing grinding with different grinding wheels in order to investigate the content and transformation procedure of a-Fe 2 O 3. The non-abrasive iron-bonded wheels showed significantly improved polishing performance with better surface quality.

Section: Introductionmentioning

confidence: 99%

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

Advances in Mechanical Engineering

2018

“…Our early reports and results show that the friction and mechanical behaviors of oxide films by ELID grinding have profound effects on its polishing ability [2][3]. Furthermore we have explored the chemical composition and transformation procedure of oxide films and their influences on polishing ability [4].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Iron-bonded Grinding Wheel after ELID (Electrolytic In-process Dressing) Electrolysis Procedure by Nanoindentation

IOP Conf. Ser.: Mater. Sci. Eng.

2017

Abstract.We have evaluated the effect of oxide films on polishing behavior during ELID grinding process. The evaluation procedure used nano-indenter to analysis quantitatively the oxide film's mechanical properties on iron-bonded grinding wheel after ELID electrolysis. As a result, the oxide film's mechanical properties increased with the indent depth increasing. The plots of indent load and displacement for oxide films showed slight variations with time. The content of iron group elements in grinding wheel also has higher impact on oxide film' s properties. IntroductionThe friction and wear performance of oxide film on grinding wheels after ELID grinding has been gaining interest in the early 2000s, which was originated by T Kato [1]. Our early reports and results show that the friction and mechanical behaviors of oxide films by ELID grinding have profound effects on its polishing ability [2-3]. Furthermore we have explored the chemical composition and transformation procedure of oxide films and their influences on polishing ability [4]. And much is known about oxide film's temperature reduction performance [5]. Moreover, the microstructure of oxide film has shown to be core of diamond abrasive grits, surrounding with a thin film of iron oxides, and the outermost layer of α-Fe2O3 composite grits [6]. The polishing ability of oxide films is confined to the existence of α-Fe2O3 [7].These reports were based on static state of oxide films. However, grinding with oxide film is not a static condition as expected. Oxide films are wore out and then electrolyzed to form new films under a dynamic change process by ELID grinding. These early studies have described a certain state during oxide films' dynamic change and couldn't represent actual performances of oxide films. And here we will focus on the dynamic variation rule of oxide film to obtain better understandings of its properties and effect on polishing procedure. The motivation of the present study is to evaluate the mechanical properties of oxide films on iron-bonded grinding wheels under dynamic conditions. Nano indentation tests are conducted to experiments the main features of oxide film's microstructure and its effect on hardness, stiffness and elasticity modulus of oxide films.

“…According to the grinding theory, the total grinding power is contributed by the workpiece, chips, and the abrasive wheels. Then the other arguments are given by P=P work + P wh +P chip (2) where P work is the grinding power contributed to the workpiece,P wh is the grinding power contributed to the grinding wheels, and P chip is the grinding power contributed to the chips. Assumed V is the volume of chips removed per unit time, and the corresponding grinding power contributed to the chips is given by…”

Section: Flash Temperature Modelingmentioning

confidence: 99%

“…More iron oxides convert into α-Fe2O3 in oxide films under the effect of the high temperature around the abrasive grains, which comes up to or excess to transition temperature [2].…”

Section: Introductionmentioning

confidence: 99%

Modeling analysis of temperatures at points in oxide film of grinding wheels

IOP Conf. Ser.: Mater. Sci. Eng.

2017