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.

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.

Effect of the Grinding Oil Type on CBN Grinding Wheels Performance

2009 ◽  
Author(s):  
Taghi Tawakoli ◽  
Abdolreza Rasifard ◽  
Alireza Vesali
Keyword(s):  
Heat Resistance ◽  
Surface Quality ◽  
Grinding Wheel ◽  
Work Piece ◽  
Grinding Process ◽  
Grinding Wheels ◽  
Grinding Forces ◽  
Vitrified Cbn ◽  
Oil Type

The efficiency of the grinding process highly depends on the coolant lubricant used. In grinding with CBN grinding wheels grinding oils are used increasingly. In the last decade new grinding oils based on different oil types are brought into the market, whose effect on the CBN grinding wheels performance until now not sufficiently been investigated. The Institute of Grinding and Precision Technology (KSF) investigated the influence of four different grinding oils on the performance of vitrified CBN grinding while grinding of 100Cr6 (M.-No. 1.3505), which is a heat-treatable steel with a very good grindability, and Nimonic A80, which is a difficult to grind heat-resistance superalloy. The obtained results show that the performance of the vitrified CBN grinding wheels—while using grinding oil as coolant lubricant—regarding the quality of the work piece surface, the grinding forces as well as the wear of the grinding wheel, highly depend on the viscosity of the grinding oil. Moreover, the results show that the surface quality and the grinding forces while using different grinding oils depend significantly on the work piece material.

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.

Research on Ceramics Crack Propagation under the Ultrasonic Vibration Grinding Based on the Nonlocal Theory

2014 ◽  
Vol 621 ◽  
pp. 134-139
Author(s):  
Jing Lin Tong ◽  
Chang Juan Zhang ◽  
Bo Zhao
Keyword(s):  
Crack Propagation ◽  
Surface Quality ◽  
Ultrasonic Vibration ◽  
Crack Propagation Rate ◽  
Propagation Rate ◽  
Nonlocal Theory ◽  
Nonlocal Effects ◽  
Ultrasonic Assisted Grinding ◽  
Ultrasonic Assisted

This paper researched the crack propagation and the variation of microstructure for ZTA ceramics under ultrasonic vibration grinding. To interpret the phenomenon, the nonlocal theory was introduced to establish the constitutive model under the ultrasonic vibration. Grinding experiments on surface quality of nanoZrO2 ceramic are carried out using diamond grinding in different condition, both with and without ultrasonic vibration. Experimental results show the surface quality after two-dimensional ultrasonic assisted grinding is superior to that after common grinding. Meanwhile, the effects of amplitudes and frequencies on ZrO2 ceramics crack propagation were analyzed by SEM. The results show that the crack propagation rate decrease with the amplitudes and frequencies increasing, this is because that the nonlocal attenuation ratio reduced and the nonlocal effects also the strongest. The results of experiments are in accordance with the theoretical conclusions drawn from the nonlocal theory, which verifies that the act ion of ultrasonic vibration can actually postpone the ceramic crack propagation rate.

Numerical Investigations on the Grinding Forces in Ultrasonic Assisted Grinding of SiC Ceramics by Using SPH Method

2014 ◽  
Vol 1017 ◽  
pp. 735-740 ◽  
Author(s):  
Zhi Qiang Liang ◽  
Zhao Yang Mi ◽  
Xi Bin Wang ◽  
Tian Feng Zhou ◽  
Yong Bo Wu ◽  
...  
Keyword(s):  
Ultrasonic Vibration ◽  
Chip Thickness ◽  
Depth Of Cut ◽  
Grinding Forces ◽  
Sph Method ◽  
Undeformed Chip Thickness ◽  
Ultrasonic Assisted Grinding ◽  
Abrasive Grain ◽  
Grinding Parameters ◽  
Ultrasonic Assisted

In this study, the grinding force variation mechanism in ultrasonic assisted grinding (UAG) of SiC ceramic is investigated by simulation method using a single diamond abrasive grain scratching. In simulation, the workpiece is modeled by smoothed particle hydrodynamic (SPH) method while the abrasive grain is modeled by finite element method (FEM). To reliably predict the grinding forces in UAG, an analytical model of average undeformed chip thickness ha is established. Grinding forces under different grinding parameters, i.e., depth of cut, and different ultrasonic vibration amplitudes are calculated by setting average undeformed chip thickness haas scratching depth during SPH simulation process. The simulation results indicate that the normal force in UAG is reduced by about 20%, while the tangential force decreases up to 30% compared with those in conventional grinding (CG). The influences of grinding parameters and ultrasonic vibration on grinding forces will be investigated and the preliminary explanations will be presented.

An Experimental Investigation of Ultrasonic Assisted Grinding in DOE Approach

2012 ◽  
Vol 565 ◽  
pp. 129-134 ◽  
Author(s):  
Kyeong Tae Kim ◽  
Yun Hyuck Hong ◽  
Kyung Hee Park ◽  
Young Jae Choi ◽  
Seok Woo Lee ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Ultrasonic Vibration ◽  
Feed Rate ◽  
Rotation Speed ◽  
Grinding Force ◽  
Machining Parameters ◽  
Grinding Forces ◽  
Ultrasonic Assisted Grinding ◽  
Ultrasonic Assisted ◽  
Conventional Grinding

In this work, grinding test was performed in terms of machining parameters, such as grinding speed, feed rate, etc., in order to study effect of ultrasonic vibration in grinding. The design of experiment (DOE) approach was used for an optimal condition of ultrasonic assisted grinding, which can minimize the grinding forces. In DOE, ultrasonic amplitude power, feed rate, and rotation speed of spindle were chosen as the major machining factors. The grinding forces were measured and compared between the conventional grinding and ultrasonic assisted grinding. From the experiment, it was found that the grinding forces decreased as the ultrasonic vibration power and the rotation speed of spindle increased while the grinding force was reduced as the feed rate increased. In addition, regression model was formulated for obtaining optimal grinding condition.

Analytical and Numerical Simulation of Ultrasonic Assisted Grinding

2010 ◽  
Author(s):  
Ahmad Farhadi ◽  
Amir Abdullah ◽  
Javad Zarkoob ◽  
Abbas Pak
Keyword(s):  
Ultrasonic Vibration ◽  
Equations Of Motion ◽  
Motion Path ◽  
Grinding Forces ◽  
Wheel Wear ◽  
Ultrasonic Assisted Grinding ◽  
Ultrasonic Assisted ◽  
Single Grain ◽  
Workpiece Interaction ◽  
Cutting Path

Ultrasonic assisted grinding of hard materials is a novel technique which is used in order to decrease grinding forces and energy. Grinding force is in direct connection with wheel wear, grinding accuracy, grinding temperature and surface integrity. In this paper the effects of ultrasonic vibration in creep feed grinding process which is superimposed to the workpiece in feed direction has been represented. The mechanism of grain-workpiece interaction in the presence of ultrasonic vibration has been investigated both analytically and numerically. The cutting path of a single grain in ultrasonic assisted grinding has been derived using equations of motion and has been compared to the grain cutting path in ordinary grinding. Using displacement equations of a single grain in ultrasonic assisted grinding and drawing the motion path, it has been shown that there exist a multiple-impact between grain and workpiece. By implementing a 2-D finite element modeling, the mechanism of chip formation in ultrasonic assisted grinding and ordinary grinding has been compared. Furthermore the effects of longitudinal workpiece vibration on the grinding forces have been investigated. FE analysis of grain-workpiece interaction in case of using ultrasonic vibration has shown a reduction of about 40% of grinding forces compared to ordinary grinding.

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.

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.

scholarly journals THE EFFECT OF ABRASIVE GRAIN SHAPES ON QUALITY OF FERRITE MAGNETS GRINDING PROCESS

2020 ◽  
Vol 14 (2) ◽  
pp. 117-124
Author(s):  
Bayu Rahmat Saputro ◽  
Amin Suhadi
Keyword(s):  
Chemical Composition ◽  
Single Layer ◽  
Processing Parameters ◽  
Grinding Process ◽  
Model Design ◽  
Grinding Wheels ◽  
Abrasive Grains ◽  
Abrasive Grain ◽  
Shape And Size

Abstract A research was conducted on the grinding process of ferrite magnet with Strontium ferrite type (SrO.6 (Fe2O3)) using electroplated single layer grinding wheels. Many cracks have been found on work pieces during this work, which is coming from grinding processes. Research is conducted starting from chemical composition test and the effect of the shape and size of the abrasive grain of grinding wheels to the quality of grinding process results by measuring crack ratio of the work piece.  In this experiment, 3 (three) model design of grinding wheels with three different size and shape of abrasive grains are made. All of processing parameters are set at the same value as ordinary process.  The experimental results shown that 3rd model have the best results from the outputs number and also the lowest reject crack ratio compared to 1st and 2nd models. This is because the 3rd model has blocky shape which its distribution structure is denser and more uniform compared to the irregular shape, so that continuous grinding on hard and brittle work pieces is more stable and suitable

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