| CHEN Feng-jun,ZHANG Lei,YIN Shao-hui,HUANG Shuai,HAO Shan-mei.Uniform Distribution Characteristic of Fine Diamond Abrasive Particles Based on High Voltage Electrostatic Spraying[J],47(7):15-20 |
| Uniform Distribution Characteristic of Fine Diamond Abrasive Particles Based on High Voltage Electrostatic Spraying |
| Received:February 27, 2018 Revised:July 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.07.003 |
| KeyWord:electrostatic spraying diamond abrasiveparticles uniformparticle distribution quantification of particleuniformity electric field strength simulation micro-surface |
| Author | Institution |
| CHEN Feng-jun |
National Engineering Research Center for High Efficiency Grinding, Hunan University, Changsha , China |
| ZHANG Lei |
National Engineering Research Center for High Efficiency Grinding, Hunan University, Changsha , China |
| YIN Shao-hui |
National Engineering Research Center for High Efficiency Grinding, Hunan University, Changsha , China |
| HUANG Shuai |
National Engineering Research Center for High Efficiency Grinding, Hunan University, Changsha , China |
| HAO Shan-mei |
National Engineering Research Center for High Efficiency Grinding, Hunan University, Changsha , China |
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| Abstract: |
| The work aims to improve uneven distribution of abrasive particles in grinding wheel duringprecision/ultra- precision forming grinding. Distribution characteristic of space electric field intensity was simulatedforneedle-ring electrode. Variationof field strength on axis with the nozzle diameter, diameter of annular electrode and electrode gapwasanalyzed. The diamond abrasive particleswereevenly dispersed in electrostatic spraying solution, which wouldform a micro surface under the action of high voltage electric field and pressure pump. The micro-surface distributionuniformity of diamond particles was quantitatively analyzedingrid analysismethod and intercept method. Theelectric field produced by needle-ring electrode was symmetrical, and electric field line was concentratedly distributed near the nozzle. Its electric field intensity decreased sharply outward along the axis. Because of tip effect, the nozzle diameter decreased, and the electric field intensity at the tip increasedobviously. The electrode gap increased and field strength at the nozzle decreased. In grid counting method, when the grid wasfine, particle distribution deviation of micro surface was greater, and the distribution uniformity wasworse. However, the method could reflect real situation of overall particledistribution, and distribution trends of deviation curveswerebasically the same. The situation appeared at the liquid flow of 20 mL/h wasnot consistent with theoretical variation. In intercept method, when the liquid flow rate increased, the distance deviation between particles decreasedgradually, and decreased obviously at the liquid flow rate of 20 mL/h. According to quantitative analysis of diamond particles micro surface distribution, grid counting method can only reflect regional distribution uniformity, but itis not sensitive to particle spacingina certain region and cannotdistinguish¬particle segregation, which leads to deviation in results. The intercept method is sensitive to particle spacing.The distribution of diamond particles can be accurately analyzedinthe combination of grid counting method and intercept method. |
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