Surface Topography of Mini-Size Diamond Wheel in Ultrasonic Assisted Grinding (UAG)

2014 ◽  
Vol 8 (4) ◽  
pp. 569-575 ◽  
Author(s):  
Masakazu Fujimoto ◽  
◽  
Yongbo Wu ◽  
Mitsuyoshi Nomura ◽  
Hidenari Kanai ◽  
...  
Keyword(s):  
Surface Topography ◽  
Diamond Wheel ◽  
Grinding Wheel ◽  
3D Analysis ◽  
Grinding Forces ◽  
Wheel Surface ◽  
Workpiece Surface ◽  
Topographic Features ◽  
Ultrasonic Assisted Grinding ◽  
Ultrasonic Assisted

The objectives of this paper are to describe a quantitative evaluation of mini-size diamond grinding wheel surface topography in Ultrasonic Assisted Grinding (UAG) process and demonstrate the effects of topography on grinding characteristics. In this study, threedimensional (3D) analysis of the wheel working surface was observed using a Scanning Electron Microscope (SEM) with four electron probes (hereafter described as 3D-SEM) in an on-surface UAG process. These results indicated that a good wheel surface maintained in the UAG process is related to the number and the area of cutting edges. Additionally, the resulting topographic features of the grinding wheel surface are closely related to low grinding forces and allow easy manufacturing of a mirror workpiece surface.

Wear Behavior of Grain Cutting Edge in Ultrasonic Assisted Grinding Using Mini-Size Wheel

2015 ◽  
Vol 9 (4) ◽  
pp. 365-372 ◽  
Author(s):  
Masakazu Fujimoto ◽  
◽  
Yongbo Wu ◽  
Mitsuyoshi Nomura ◽  
Hidenari Kanai ◽  
...  
Keyword(s):  
Wear Behavior ◽  
Diamond Wheel ◽  
Cutting Edge ◽  
Grinding Forces ◽  
Wheel Wear ◽  
Workpiece Surface ◽  
Ultrasonic Assisted Grinding ◽  
Ultrasonic Assisted ◽  
Conventional Grinding ◽  
The Stability

This paper deals with the wear behavior of the mini-size diamond wheel used in Ultrasonic Assisted Grinding (UAG). The aim is to understand the wheel wear behavior. Sequential changes of the surface topography of the mini-size wheel, such as the number and shape of grains of the cutting edge, during the on-surface UAG process were observed and evaluated quantitatively using a Scanning Electron Microscope with four electron probes (3D-SEM). The obtained results show that a good wheel surface is maintained during the UAG process compared with the Conventional Grinding (CG) process. In particular, a number of sharp grain cutting edges are larger in the UAG process than those of the CG process. Additionally, these results are closely related to the stability of grinding forces and the reduction of the finished workpiece surface.

A Study on Ultrasonic Assisted Grinding of Nickel-Based Superalloys

2013 ◽  
Vol 797 ◽  
pp. 356-361
Author(s):  
Wen Qing Song ◽  
Yong Bo Wu ◽  
Jian Guo Cao ◽  
Jing Ti Niu
Keyword(s):  
Surface Roughness ◽  
Grinding Wheel ◽  
Grinding Forces ◽  
Work Surface ◽  
Ultrasonic Assisted Grinding ◽  
Nickel Based Superalloy ◽  
Ultrasonic Assisted ◽  
The Face ◽  
Cbn Grinding Wheel ◽  
Face Grinding

Ultrasonic assisted grinding experiments were carried out to evaluate the effects of the ultrasonic vibration (UV) on the face grinding characteristics of nickel based superalloy of Rene77. In experiments, an electroplated cBN grinding wheel was ultrasonically vibrated dominantly along its axis. The experimental results indicated that the X-axis and Y-axis components of grinding forces with UV were smaller by 44.5% and 31.6%, respectively, than those without UV. The usual fractures and debris on the surface of workpiece disappeared and the work-surface roughness Ra was decreased by 42.3% once the UV was applied. The abrasion of the grinding wheel without UV is more serious than that with UV.

Effects of Ultrasonic Assisted Grinding on CBN Grinding Wheels Performance

2009 ◽  
Author(s):  
Taghi Tawakoli ◽  
Bahman Azarhoushang
Keyword(s):  
Ultrasonic Vibration ◽  
Specific Energy ◽  
Grinding Process ◽  
Grinding Wheels ◽  
Grinding Forces ◽  
Workpiece Surface ◽  
Ultrasonic Assisted Grinding ◽  
Ultrasonic Assisted ◽  
Vitrified Cbn

The effects of ultrasonic assisted grinding on vitrified CBN grinding wheels performance have been investigated. The ultrasonic vibration has been superimposed to the workpiece in feed and cross feed directions and the kinematics of the process in both directions have been discussed. The obtained results show that applying ultrasonic vibration to the grinding process can improve the quality of the workpiece surface, the efficiency of the process and decrease the grinding forces and specific energy considerably.

Experimental Investigations of Grinding Forces in Elliptical Ultrasonic Assisted Grinding (EUAG) of Monocrystal Sapphire

2013 ◽  
Vol 797 ◽  
pp. 223-228
Author(s):  
Zhi Qiang Liang ◽  
Tian Feng Zhou ◽  
Xi Bin Wang ◽  
Yong Bo Wu ◽  
Wen Xiang Zhao
Keyword(s):  
Ultrasonic Vibration ◽  
Wheel Speed ◽  
Depth Of Cut ◽  
Grinding Wheel ◽  
Grinding Forces ◽  
Ultrasonic Assisted Grinding ◽  
Grinding Parameters ◽  
Force Ratio ◽  
Ultrasonic Assisted ◽  
Vibration Assistance

Grinding forces characteristics in elliptical ultrasonic assisted grinding (EUAG) of sapphire are investigated experimentally. The EUAG is a new grinding method proposed by the present authors in which an elliptical ultrasonic vibration is imposed on the workpiece by using an elliptical ultrasonic vibrator. In this paper, grinding experiments under the presence/absence of ultrasonic vibration assistance are performed. The effects of the vibration amplitude and grinding parameters such as the depth of cut, the grinding wheel speed on the grinding forces, grinding force ratioFn/Ftare clarified. The obtained conclusions are as follows: the grinding forces during EUAG lowers to 50% and grinding forces ratio becomes reduced by 33% compared that during conventional grinding (CG); the grinding forces during EUAG have the less variation rate than those during CG as grinding parameters change; higher grinding wheel speed causes the larger grinding forces in CG, but has little effect on the variation of grinding forces in EUAG. By using EUAG method, the grinding forces and force ratio are greatly decreased, and surface quality is better, meaning that grindability of sapphire material is improved.

Elliptical Ultrasonic Assisted Grinding (EUAG) of Monocrystal Sapphire – Wear Behaviors of Resin Bond Diamond Wheel

2010 ◽  
Vol 126-128 ◽  
pp. 573-578 ◽  
Author(s):  
Yong Bo Wu ◽  
Zhi Qiang Liang ◽  
Xi Bin Wang ◽  
Wei Min Lin
Keyword(s):  
Diamond Wheel ◽  
Grinding Force ◽  
Grinding Forces ◽  
Wheel Wear ◽  
Wear Process ◽  
Work Surface ◽  
Ultrasonic Assisted Grinding ◽  
Abrasive Grains ◽  
Experimental Apparatus ◽  
Ultrasonic Assisted

This paper describes the wear behaviors of a resin bond diamond wheel in elliptical ultrasonic assisted grinding (EUAG) of monocrystal sapphire. The EUAG is a new grinding method proposed by the present authors in which an elliptical ultrasonic vibration is imposed on the workpiece by using an elliptical ultrasonic vibrator. In our previous work, an experimental apparatus mainly composed of the vibrator was produced and grinding experiments were conducted involving sapphire workpiece. In this paper, further investigations focusing on the wear behaviors of resin bond diamond wheel in EUAG of sapphire were carried out experimentally. The obtained results showed that: (1) the wheel wear process can be divided to three regions according to the variation trend of grinding forces, i.e., an initial region, a steady region, and a deteriorated region; (2) in the initial and steady regions, the grinding forces and the ratio of the normal grinding force to the tangential grinding force in EUAG are much smaller than that in conventional grinding (CG), but in deteriorated region, the grinding forces in EUAG are increased significantly up to be larger than that in CG whereas the grinding forces ratio has few difference between those in EUAG and CG; (3) in all the regions, the work-surface in EUAG is much smoother than that in CG whereas the wheel wear has little influence on the work-surface roughness; (4) the wheel wear in CG is mainly caused by the attrition wear and the macro-fracture and pullout of abrasive grains, while in EUAG by the micro-fracture and cleavage of abrasive grains.

Characteristics of the Wheel Surface Topography in Ultra-precision Grinding of Silicon Wafers

2008 ◽  
Vol 389-390 ◽  
pp. 36-41
Author(s):  
Feng Wei Huo ◽  
Dong Ming Guo ◽  
Ren Ke Kang ◽  
Zhu Ji Jin
Keyword(s):  
Surface Topography ◽  
Sampling Interval ◽  
Grinding Wheel ◽  
Height Distribution ◽  
Wheel Surface ◽  
Diamond Grinding Wheel ◽  
Diamond Grinding ◽  
Cutting Surface ◽  
Ultra Precision ◽  
Cutting Direction

A 3D profiler based on scanning white light interferometry with a lateral sampling interval of 0.11μm was introduced to measure the surface topography of a #3000 diamond grinding wheel, and a large sampling area could be achieved by its stitching capability without compromising its lateral or vertical resolution. The protrusion height distribution of diamond grains and the static effective grain density of the grinding wheel were derived, and the wheel chatter and the deformation of the wheel were analyzed as well. The study shows that the grain protrusion height obeys an approximate normal distribution, the static effective grain density is much lower than the theoretical density, and only a small number of diamond grains are effective in the grinding process with fine diamond grinding wheel. There exists waviness on the grinding wheel surface parallel with the wheel cutting direction. The cutting surface of the grinding wheel is not flat but umbilicate, which indicates that the elastic deformation at the wheel edges is much larger than in the center region.

Numerical Simulation Study on Truing and Dressing of Bronze-Bonded Diamond Wheel with Pulsed Laser

2007 ◽  
Vol 359-360 ◽  
pp. 166-170
Author(s):  
Gen Yu Chen ◽  
Li Fang Mei ◽  
Bi Zhang ◽  
Ding Jun Zhu ◽  
Guo Gui Chen
Keyword(s):  
Laser Ablation ◽  
Pulsed Laser ◽  
Diamond Wheel ◽  
Ablation Depth ◽  
Grinding Wheel ◽  
Ablation Process ◽  
Wheel Surface ◽  
Laser Ablation Process ◽  
Topographic Information ◽  
Single Process

A two-dimensional mathematical model is developed to simulate laser truing and dressing of bronze-bonded diamond grinding wheel. Based on the model, the ablation depth produced on bond and diamond abrasives by an acousto-optic Q-switched YAG pulsed laser under different parameters as well as the temperature field on grinding wheel surface produced in the laser ablation process are numerically simulated. An experimental study on laser truing and dressing of grinding wheel is also conducted. In the study, the wheel surface is ablated by the single-pulsed laser and measured with a measurement device for surface topographic information. Both the theoretical analysis and the experimental results indicate that the truing and dressing processes can be simultaneously realized with the laser ablation as a single process.

Effect of the Coolant Lubricant Type and Dress Parameters on CBN Grinding Wheels Performance

2009 ◽  
Vol 76-78 ◽  
pp. 163-168 ◽  
Author(s):  
Taghi Tawakoli ◽  
Abdolreza Rasifard ◽  
Alireza Vesali
Keyword(s):  
Grinding Wheel ◽  
Grinding Wheels ◽  
Grinding Forces ◽  
Workpiece Surface ◽  
Vitrified Cbn

The efficiency of using of CBN grinding wheels highly depends on the dressing process as well as on the coolant lubricant used. The Institute of Grinding and Precision Technology (KSF) investigated the performance of vitrified CBN grinding wheels -being dressed using different parameters- while using two different grinding oils and two different water-miscible coolant lubricants. The obtained results show that the performance of the vitrified CBN grinding wheels regarding the quality of the workpiece surface, the grinding forces as well as the wear of the grinding wheel, highly depend on the dressing conditions and the type of the coolant lubricant used. Compared to the water-miscible coolant lubricants, the grinding oils show better results.

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