Tribological properties of surface topography in ultrasonic vibration-assisted grinding of zirconia ceramics

2017 ◽  
Vol 232 (22) ◽  
pp. 4203-4215
Author(s):  
Zhihua Li ◽  
Kan Zheng ◽  
Wenhe Liao ◽  
Xingzhi Xiao
Keyword(s):  
Friction Coefficient ◽  
Surface Topography ◽  
Ultrasonic Vibration ◽  
Tribological Properties ◽  
Vibration Amplitude ◽  
Spindle Speed ◽  
Zirconia Ceramics ◽  
Significant Difference ◽  
Vibration Parameters ◽  
Ultrasonic Vibration Assisted Grinding

In order to clarify the friction phenomenon of zirconia ceramics in the dental prosthodontics, tribological properties of surface topography in ultrasonic vibration-assisted grinding (UVAG) are studied in this work. The mechanism of material removal is researched to introduce the discontinuous grooves in UVAG theoretically. The UVAG experiments are conducted on zirconia ceramics. Through investigating and comparing experimental results, it is found that UVAG surface has better tribological properties compared with diamond grinding surface. 3D surface roughnesses of UVAG surface are improved when suitable spindle speed, large feed, small cutting depth, and large vibration amplitude are adopted. Surface topography in UVAG changes from thorn scaly to discontinuous shallow furrow when feed increases and spindle speed decreases. The discontinuous grooves are most apparent when vibration amplitude is maximum. Furthermore, the friction coefficient is experimentally studied. The results indicate that there is no significant difference among all the friction coefficients in UVAG. Proper cutting and vibration parameters can improve the average friction coefficient.

Ultrasonic Vibration Assisted Grinding of Sintered Dental Zirconia Ceramics: An Experimental Study on Surface Roughness

2014 ◽  
Vol 1017 ◽  
pp. 800-805 ◽  
Author(s):  
Song Dong ◽  
Kan Zheng ◽  
Xing Zhi Xiao
Keyword(s):  
Surface Roughness ◽  
Ultrasonic Vibration ◽  
Spindle Speed ◽  
Machining Process ◽  
Zirconia Ceramics ◽  
Cutting Depth ◽  
Hard And Brittle Materials ◽  
Input Variables ◽  
Dental Zirconia Ceramics ◽  
Ultrasonic Vibration Assisted Grinding

Dental zirconia ceramics have been widely used in dental restorations due to their superior aesthetical and mechanical properties. Ultrasonic vibration assisted grinding (UVAG), as a novel effective machining process for hard and brittle materials, is introduced into directly machining sintered dental zirconia ceramics. This study is dedicated to investigating the influence of input variables (spindle speed, feedrate and cutting depth) on surface roughness during UVAG of sintered dental zirconia ceramics. The experiment is conducted through single-factor method, and the experimental results are statistically analyzed by One-Way ANOVA. Besides, the influence tendency of input variables on surface roughness is also obtained. The results indicate that the influence of spindle speed on surface roughness is highly significant. The value of surface roughness rises with the increase of spindle speed, feedrate, and cutting depth. Therefore, a better surface quality will be achieved with the combination of lower spindle speed, cutting depth and feedrate.

Generation mechanism modeling of surface topography in tangential ultrasonic vibration-assisted grinding with green silicon carbide abrasive wheel

2021 ◽  
pp. 095440542110406
Author(s):  
Yutong Qiu ◽  
Jingfei Yin ◽  
Yang Cao ◽  
Wenfeng Ding
Keyword(s):  
Surface Roughness ◽  
Surface Topography ◽  
Ultrasonic Vibration ◽  
Generation Mechanism ◽  
Surface Generation ◽  
Depth Of Cut ◽  
Abrasive Wheel ◽  
Grinding Parameters ◽  
Conventional Grinding ◽  
Ultrasonic Vibration Assisted Grinding

Tangential ultrasonic vibration-assisted grinding (TUAG) has a wide prospect in machining difficult-to-machine materials. However, the surface generation mechanism in TUAG is not fully recovered. This study proposes an analytical model of the surface topography produced by TUAG. Based on the model, the surface topography and roughness are predicted and experimentally verified. In addition, the influence of the grinding parameters on the surface topography is analyzed. The predicted surface topography well coincides with experimental measurements, and the prediction error in surface roughness Ra by the proposed model is less than 5%. Compared with conventional grinding, TUAG produces a surface with more uniform scratches and surface roughness Ra was reduced by up to 27% with the proper parameters. However, the improvement of surface roughness in TUAG is weakened when grinding speed or depth of cut increases. Moreover, the influence of the ultrasonic vibration amplitude on the surface roughness is not monotonous. With the grinding parameters selected in this study, TUAG with an ultrasonic amplitude of 7.5 μm produces the minimum surface roughness.

Investigation on feed direction cutting force in ultrasonic vibration-assisted grinding of dental ceramics

2016 ◽  
Vol 231 (19) ◽  
pp. 3493-3503 ◽  
Author(s):  
Heng Meng ◽  
Kan Zheng ◽  
Xingzhi Xiao ◽  
Wenhe Liao
Keyword(s):  
Mathematical Model ◽  
Cutting Force ◽  
Ultrasonic Vibration ◽  
Abrasive Particle ◽  
Force Model ◽  
Zirconia Ceramics ◽  
Feed Direction ◽  
Input Variables ◽  
The Mathematical Model ◽  
Ultrasonic Vibration Assisted Grinding

The feasibility of ultrasonic vibration-assisted grinding in dental restoration has been preliminarily proved. Improving the machining quality of zirconia ceramics by controlling cutting force is the focus of the researchers. However, the existing feed direction cutting force model for ultrasonic vibration-assisted grinding does not take the ultrasonic vibration amplitude and frequency into account. This paper presents a mathematical model for feed direction cutting force in ultrasonic vibration-assisted grinding of zirconia under the consideration of amplitude and frequency, and assuming that brittle fracture is the primary mechanism of material removal in ultrasonic vibration-assisted grinding of zirconia. The effects of amplitude and frequency on the motion, effective cutting distance, and theoretical removal of an abrasive particle have been analyzed. Besides, the number of active abrasive particles is calculated with analyzing the influences of lateral cracks and ultrasonic vibration. The variation laws of cutting force and penetration depth of an abrasive particle during ultrasonic vibration-assisted grinding have also been analyzed. Therefore, the relationship between feed direction cutting force and input variables is predicted through the developed model. Finally, pilot experiments are conducted for the mathematical model verification. Experimental results show that the trends of input variables for feed direction cutting force agree well with the trends of the developed cutting force model. Hence, the mathematical model can be applied to evaluate the feed direction cutting force in ultrasonic vibration-assisted grinding of zirconia ceramics.

Study on Ultrasonic Vibration Assisted Grinding in Theory

2006 ◽  
Vol 532-533 ◽  
pp. 773-776 ◽  
Author(s):  
Hong Li Zhang ◽  
Jian Hua Zhang ◽  
Meng You Huo
Keyword(s):  
Ultrasonic Vibration ◽  
Vibration Amplitude ◽  
Axial Direction ◽  
Grinding Force ◽  
Wheel Speed ◽  
Machining Process ◽  
Grinding Wheel ◽  
Trace Length ◽  
Cutting Model ◽  
Ultrasonic Vibration Assisted Grinding

In ultrasonic vibration assisted grinding (UAG) along the axial direction, the machining process of an abrasive grit is introduced in this paper. During the internal UAG, the critical speed is determined by the amplitude and frequency of ultrasonic vibration. During the surface UAG, the cutting model of an abrasive grit is established and the cutting trace length of an abrasive grit and the grinding force making chips deformation is analyzed in theory. The analysis results show that the cutting trace length is longer by introducing ultrasonic vibration along the axial direction; the grinding force is decreased, the higher vibration amplitude and frequency is helpful to the decrease of the grinding force and the higher grinding wheel speed weakens the contributiveness of ultrasonic vibration to the decrease of the grinding force.

Effects of Friction Load and Ultrasonic Vibration on the Tribological Properties of Al2O3/Al2O3 Ceramic Friction Pairs under Liquid Paraffin Lubrication

2013 ◽  
Vol 652-654 ◽  
pp. 1881-1885
Author(s):  
Xin Yu Dong ◽  
Yu Lin Qiao ◽  
Yan Zang ◽  
Qing Sheng Cui
Keyword(s):  
Friction Coefficient ◽  
Ultrasonic Vibration ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Liquid Paraffin ◽  
Friction Reduction ◽  
Wear Volume ◽  
Oil Lubrication ◽  
Wear Properties ◽  
Load Range

The effects of friction load and ultrasonic vibration on friction reduction and anti-wear properties of Al2O3/Al2O3 ceramic frictional pairs under oil lubrication were investigated by a modified MFT-R4000 reciprocating friction and wear tester. The mechanism of friction reduction and anti-wear under ultrasonic vibration was discussed. The results showed that, the ultrasonic vibration could influence the friction reduction and anti-wear properties of Al2O3/Al2O3 ceramic friction pairs due to it could reduce the stress between the friction pairs and destroy the oil film on the surface of samples. When the friction frequency was 2Hz, the ultrasonic vibration could reduce the friction coefficient within experiment load range. When the loads were 70N, 80N, 90N and 100N, the average friction coefficient were reduced by 16.1%, 14.5%, 9.7% and 2.6%,and wear volume of frictional pairs decreased 35%、32%、31% and 12%.

Characterization of Diamond Electrodeposited Tool for Vibration Assisted Grinding Diagnostic

2014 ◽  
Vol 980 ◽  
pp. 203-207
Author(s):  
Mohd Fauzi Ismail
Keyword(s):  
Surface Topography ◽  
Ultrasonic Vibration ◽  
Causal Analysis ◽  
High Magnification ◽  
Optimum Size ◽  
Constant Condition ◽  
Work Surface ◽  
Working Surface ◽  
Ultrasonic Vibration Assisted Grinding

Causal analysis of diamond electrodeposited tools surface topography to the variation of grinding results is required to clarify the variations in grinding results of its application in ultrasonic vibration assisted grinding (UVAG) for steel mirror finishing. On the other hands, reference datum as defined by existing surface topography standard is not suitable and may lead to fruitless conclusion in relation to the DET characterization. This study aims to characterize the DET surface topography in relation to its performance in UVAG for steel mirror finishing. In this paper, samples of DET tool-work pairs are obtained from constant condition UVAG grinding test. The whole surface of DET surface topography is captured in one measurement using con-focal laser microscope and stitching toolbox. Surface Reversal Method is proposed to obtain the reference datum for the identification of active grains (diamond grains which actually involved in the grinding) on the DET working surface based on the most protruded grains from the surface. Based on the protrusion depth, this study found that only small number of grains can be considered as active grains. Then, each DET is characterized based on the distance of active grain to the tool rotational centre (active grain locus Rg). As a result, it is clarified that there is a non-linear relationship between the active grain locus Rg and work surface roughness Sq. There is an optimum size of active grain locus Rg for current grinding condition and for larger or smaller Rg, higher work roughness Sq is observed. Additionally, observation using high magnification white light interferometer on the work surface topography for each sample showed the existence of ultrasonic vibration marks with the marks wavelength consistence to the size of active grain locus Rg of the DET, which also validates the methodology used for DET characterization.

scholarly journals Characteristics of the Surface Topography and Tribological Properties of Reinforced Aluminum Matrix Composite

Materials ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 358
Author(s):  
Magdalena Niemczewska-Wójcik ◽  
Manickaraj Pethuraj ◽  
Marimuthu Uthayakumar ◽  
Mohd Shukry Abdul Majid
Keyword(s):  
Wear Resistance ◽  
Friction Coefficient ◽  
Surface Topography ◽  
Tribological Properties ◽  
Aluminum Matrix ◽  
Wear Intensity ◽  
Tribological Characteristics ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Tribological Tests

Due to their excellent synergistic properties, Aluminum Matrix Composites (AMC) have achieved a high degree of prominence in different industries. In addition to strength, the wear resistance of materials is also an important criterion for numerous applications. The wear resistance depends on the surface topography as well as the working conditions of the interacting parts. Therefore, extensive experiments are being conducted to improve the suitability of engineering materials (including AMC) for different applications. This paper presents research on manufactured aluminum metal matrix composites reinforced with 10 wt.% of Al2SiO5 (aluminum sillimanite). The manufactured and prepared samples were subjected to surface topography measurements and to tribological studies both with and without lubricant using a block-on-ring tester. Based on the results, analyses of the surface topography (i.e., surface roughness parameters, Abbott–Firestone curve, and surface defects) as well as of the tribological characteristics (i.a. friction coefficient, linear wear, and wear intensity) were performed. Differences in the surface topography of the manufactured elements were shown. The surface topography had a significant impact on tribological characteristics of the sliding joints in the tests where lubrication was and was not used. Better tribological characteristics were obtained for the surfaces characterized by greater roughness (determined on the basis of both the profile and surface texture parameters). In the case of tribological tests with lubrication, the friction coefficient as well as the wear intensity was significantly lower compared to tribological tests without lubrication. However, lower values of the friction coefficient and wear intensity were still recorded for the surfaces that were characterized by greater roughness. The obtained results showed that it is important to analyze the surface topography because surface characteristics influence tribological properties.

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