Manufacturing Technology of α-Fe Bonded Grinding Wheel Free Abrasive

2018 ◽  
Vol 780 ◽  
pp. 111-115 ◽  
Author(s):  
Ji Cai Kuai ◽  
Dmitrii V. Ardashev ◽  
Jia Qi Zhang ◽  
Hua Li Zhang
Keyword(s):  
Oxide Film ◽  
High Surface ◽  
Grinding Wheel ◽  
Mirror Surface ◽  
Precision Grinding ◽  
Abrasive Particles ◽  
Elid Grinding ◽  
Abrasive Grain ◽  
Ultra Precision ◽  
Free Abrasive

ELID ultra-precision grinding mirror surface can achieve nanometer precision. However, after the grinding wheel passivates the abrasive particles in electrolysis, it is easy to scratch the ultra-precision ELID grinding surface into the grinding process. In order to solve this problem, a non-abrasive grain α-Fe bonded grinding wheel is propose, which contains no abrasive particles. After electrolysis, oxide film is formed on the surface of the wheel. In ultra-precision ELID grinding, there is no abrasive particles involved, only the polishing effect of oxide film. There is no need to worry about the scratching of exfoliated abrasive particles that have been machined on ultra-precision ELID surfaces. Thus achieving extremely high surface accuracy.

Experimental study on the characteristic and function of oxide film formed on grinding wheel in ELID precision grinding

2019 ◽  
Vol 72 (5) ◽  
pp. 549-555
Author(s):  
Jia-Bo Zhang ◽  
Yang Yang ◽  
Xiao-Hui Zhang ◽  
Jia-Liang Guan ◽  
Li-Yan Zheng ◽  
...  
Keyword(s):  
Oxide Film ◽  
Formation Rate ◽  
Combination Method ◽  
Grinding Wheel ◽  
Precision Grinding ◽  
Content Type ◽  
Elid Grinding ◽  
Grinding Fluid ◽  
Film Forming ◽  
And Function

Purpose The purpose of this study is to investigate the characteristic and function of oxide film formed on grinding wheel in electrolytic in-process dressing (ELID) precision grinding and improve the quality of ELID grinding. Design/methodology/approach Dynamic film forming experiments were carried out with a simulation device close to the actual processing conditions. Then, the ELID grinding experiments of bearing rings were performed using grinding wheels with good film forming effect. The experiment was designed by quadratic regression general rotation combination method. The influence of grinding depth, electrolytic voltage, duty cycle and grinding wheel linear speed on grinding effect is analyzed. Findings A mathematical model for the formation rate of oxide film was established. The experiments show that the composition of grinding wheel and grinding fluid, as well as the electrical parameters, influence the film forming effect. Thus, the oxide film plays an important role in ELID grinding. Originality/value This study provides a reference for the design and selection of grinding wheel and grinding fluid and the setting of process parameters in ELID grinding.

A Study of a New ELID Grinding Fluid by BP Neural Network Model

2011 ◽  
Vol 58-60 ◽  
pp. 1792-1796
Author(s):  
Wei Li ◽  
Yu Jie Fan
Keyword(s):  
Neural Network ◽  
Bp Neural Network ◽  
Grinding Wheel ◽  
Precision Grinding ◽  
Elid Grinding ◽  
Environmental Friendly ◽  
Grinding Fluid ◽  
Hard And Brittle Materials ◽  
Ultra Precision ◽  
Bp Neural Network Model

Electronic in-process dressing (ELID) grinding will be a main technology of ultra-precision grinding which has been widely adopted to the ultra-precision and high effectively machining of hard and brittle materials. This study puts forward a new environmental friendly bamboo charcoal bonded (BCB) grinding wheel and develops a new ELID grinding fluid. An oxide layer is mostly determined by the electric performance of grinding fluid in the experiment. This paper founds a model to forecast grinding fluid’s electric performance by BP neural network and MATLAB. This method can be used in developing of ELID grinding machining fluid to improve the ELID grinding effect.

The Research of ELID Grinding Effect and Surface Quality on Carbonized Cold-Rolled Steel

2012 ◽  
Vol 229-231 ◽  
pp. 542-546
Author(s):  
J.L. Guan ◽  
Li Li Zhu ◽  
H.W. Lu ◽  
Zhi Wei Wang
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Grinding Wheel ◽  
Rolled Steel ◽  
Precision Grinding ◽  
Cold Rolled Steel ◽  
Elid Grinding ◽  
Peripheral Velocity ◽  
Ultra Precision ◽  
Cold Rolled

In this document, the electrolytic in-process dressing ( ELID ) grinding technique is used for ultra-precision processing experimental research on the carbonized cold-rolled steel (HRC60～80).A surface roughness of Ra6～8nm was obtained after ELID precision grinding. The results proved that adopting micro grain size (W1.5～W36) and high hardness cast iron based diamond grinding wheel, increasing the wheel peripheral velocity (18～20m/s) and reducing grinding depth can effectively improve surface quality and bring the surface roughness down. The wheel peripheral velocity, grinding depth as well as grinding fluid are the main factors during ultra-precision grinding.

Study on the Machining Principle and Experiment of Grinding

2013 ◽  
Vol 395-396 ◽  
pp. 1000-1003
Author(s):  
Qiang Xiao
Keyword(s):  
New Technology ◽  
Surface Damage ◽  
Grinding Wheel ◽  
Process Technology ◽  
Precision Grinding ◽  
Brittle To Ductile Transition ◽  
Elid Grinding ◽  
Ductile Mode ◽  
Grinding Mechanism ◽  
Ultra Precision

ELID for SiC which enables the improvement of surface quality is put forward. ELID grinding technology is new technology of ultra-precision grinding, and the oxide film is formed on grinding wheel by electrolytic in-process technology, thus the wheel is in-process dressed. SiC material removal mechanism and ELID grinding mechanism is analyzed, the character and condition of brittle to ductile transition of SiC and surface formation mechanism of ductile mode grinding of SiC are studied, the results show that ELID grinding can realize ductile grinding ,this will lower the surface damage and improve the machining efficiency.

Research on Precision Mirror Machining Technology for W-Mo Alloy

2011 ◽  
Vol 487 ◽  
pp. 303-307
Author(s):  
Jia Liang Guan ◽  
H.W. Lu ◽  
X.H. Xiao ◽  
Y.C. Wu ◽  
Z.D. Chen
Keyword(s):  
Surface Quality ◽  
Formation Mechanism ◽  
Rotational Speed ◽  
Precision Machining ◽  
Work Piece ◽  
Mirror Surface ◽  
Precision Grinding ◽  
Elid Grinding ◽  
Ultra Precision

A new way of precision machining was studied through the experiments of Electrolytic In-Process Dressing (ELID) precision grinding and ultra precision lapping and polishing for W-Mo metal alloy. First a 22nm(Ra) surface was obtained through the ELID grinding, last a 11nm(Ra) surface was obtained after the process of lapping and polishing with 0.1～0.3 N/cm2pressure, 60～100 r/min rotational speed and other optimized parameters. Meanwhile, the formation mechanism of ultra precision mirror surface of the alloy was also analyzed. The experiments prove surface quality of the work piece was guaranteed by ELID grinding, and which was also greatly affected by some parameters in lapping and polishing such as pressure, rotational speed.

Research on ELID Ultra-Precision Grinding Performance of SiCp/Al Composites

2014 ◽  
Vol 614 ◽  
pp. 75-78
Author(s):  
Jia Liang Guan ◽  
Lei Zhu ◽  
Ling Chen ◽  
Xin Qiang Ma ◽  
Xiao Hui Zhang
Keyword(s):  
Surface Roughness ◽  
Cast Iron ◽  
Rotation Speed ◽  
Grinding Wheel ◽  
Feed Speed ◽  
Precision Grinding ◽  
Machined Surface ◽  
Elid Grinding ◽  
Machined Surface Roughness ◽  
Ultra Precision

The electrolytic in-process dressing (ELID) grinding technology was adopted for ultra-precision grinding experiments of SiCp/Al composites; the machined surface roughness can obtain Ra0.030μm. The experiments show that: with the grinding wheel rotation speed of 1500r/min, the grinding depth of 0.1μm, and feed speed of 2m/min and using W5 cast iron bonded diamond grinding wheel, the grinding effect can achieve optimal.

scholarly journals Development of a Desktop Machine Tool for Mirror Surface Grinding

2010 ◽  
Vol 4 (2) ◽  
pp. 88-96 ◽  
Author(s):  
Hitoshi Ohmori ◽  
◽  
Yoshihiro Uehara
Keyword(s):  
Machine Tool ◽  
Surface Grinding ◽  
Grinding Wheel ◽  
Mirror Surface ◽  
Elid Grinding ◽  
Fine Grain ◽  
Abrasive Grain ◽  
Micro Parts ◽  
Grinding Technique ◽  
Grinding System

This paper is a report on the process of developing a desktop machine tool to be used in “Micro Workshops.” It incorporates emerging technologies for the production of “micro parts and components” as a newMonotsukuriThe resultant desktop machine tool was developed after designing structures which simultaneously meet both requirements of lighter weight and sufficient rigidity and which prove to be capable of producing mirror quality finish using the electrolytic in-process dressing (ELID) grinding .system.In order to verify the successful achievement of mirror surface grinding, a fine grain (#8000) abrasive grinding wheel used in the ELID grinding system was employed to generate an aspherical surface by cross grinding technique after completion of development on the aforementioned simultaneous achievement of lightness and rigidity for mainframe structure of the machine.The grinding wheels used in this experiment were a grinding wheel of #1200 diamond abrasive grain bonded with cast iron and another type of grinding wheel of #8000 cerium oxide abrasive grain bonded with metal resin.As the basic experiment, a silica-glass workpiece was ground and finished using the cross-grinding technique. The result showed that stable grinding and finishing operations can be achieved without burning during grinding even by using a very fine abrasive grain of #8000 or higher.

Machined Surface Characteristics and Removal Mechanism of Soft and Brittle Solids

2010 ◽  
Vol 447-448 ◽  
pp. 183-187 ◽  
Author(s):  
Zhen Yu Zhang ◽  
Rudy Irwan ◽  
Han Huang
Keyword(s):  
Surface Characteristics ◽  
Abrasive Machining ◽  
Precision Grinding ◽  
Machined Surface ◽  
Brittle Solids ◽  
The Coefficient Of Friction ◽  
Ultra Precision ◽  
Ductile Removal ◽  
Fracture Features ◽  
Free Abrasive

Surface characteristics of CZT wafers machined using wire sawing, free abrasives lapping and polishing and ultra-precision grinding were investigated. Wire sawing resulted in the removal of material in both ductile and brittle regimes, but both polishing and grinding led to a ductile removal. The grinding produced very smooth surfaces free of embeddings and scratches, which is thus considered to have better machinability than the free abrasive machining. The nanoindentation and nanoscratch on MCT wafers at nanometric scales resulted in considerable plastic deformation, but no fracture features. The hardness of the MCT wafer was 500 to 550 MPa, and the coefficient of friction was particularly high, ranging from 0.45 to 0.55.

Research on the 3-Axis CNC Ultra-Precision Grinding of Aspheric Mould

2009 ◽  
Vol 69-70 ◽  
pp. 39-43 ◽  
Author(s):  
Li Jun Li ◽  
Fei Hu Zhang ◽  
Shen Dong
Keyword(s):  
Influence Factors ◽  
Grinding Wheel ◽  
Aspheric Surface ◽  
Precision Grinding ◽  
Form Accuracy ◽  
Form Errors ◽  
Machining Test ◽  
Ultra Precision ◽  
Grinding System ◽  
Parallel Grinding

Parallel grinding is an effective method of aspheric moulds machining which is usually made of industrial ceramic such as silicon carbide (SiC) or tungsten carbide (WC), but if the spherical grinding wheel is not being with precision truing and dressing, the roughness and form accuracy of the ground aspheric surface should get worse, for this reason, in this paper, the influence factors of thoroughness and form accuracy induced by the wheel truing and dressing are studied firstly, and a new 3-axis CNC Ultra-precision grinding system which is based on the PMAC (Programmable Multi-axes Controller) is developed, through simultaneous motion of the controlled X, Z and B axis, the form errors which is induced by the grinding wheel can be improved theoretically, and the aspheric mould machining test shown that the surface roughness of Ra 0.025μm and the form accuracy of P-V 1.15μm are achieved.

Forming Mechanism of Composite Abrasive Grains in Oxide Film on ELID Wheel and its Microstructure

2016 ◽  
Vol 709 ◽  
pp. 77-81 ◽  
Author(s):  
Ji Cai Kuai ◽  
Cheng Ran Jiang ◽  
Jiang Wei Wang
Keyword(s):  
Oxide Film ◽  
Grinding Wheel ◽  
Compound Structure ◽  
Wheel Surface ◽  
Forming Mechanism ◽  
Elid Grinding ◽  
Abrasive Grains ◽  
Shaped Crack

In this paper we analyze the forming mechanism of composite abrasive grains in oxide film on ELID grinding wheel surface, By using composition information and by taking advantage of microscale structure, we have investigated that abrasive grains surface is covered by a layer of oxide film and the fresh oxide film is loose and porous like turtle shaped crack when crushed and dried. The elements of oxide film consist of α-Fe2O3 with sphere grain of 5-50nm. This phenomena is demonstrated that the composite abrasive grains in oxide film is a compound structure which is centered by abrasive grains, with α-Fe2O3,Fe (OH)3 surrounded.

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