Study on Surface Residual Stress of Nano-Zirconia Toughened Alumina Ceramics under Two-Dimentional Ultrasonic Vibration Assisted Grinding

2010 ◽  
Vol 126-128 ◽  
pp. 143-147
Author(s):  
Yan Yan Yan ◽  
Bo Zhao ◽  
Jun Li Liu
Keyword(s):  
Residual Stress ◽  
Surface Quality ◽  
Ultrasonic Vibration ◽  
Alumina Ceramics ◽  
Surface Residual Stress ◽  
Diamond Grinding ◽  
Ultrasonic Vibration Assisted Grinding ◽  
Zirconia Toughened Alumina ◽  
Surface Microcrack

Based on good processing property of two-dimentional ultrasonic vibration assisted grinding (TUVAG), the precision finishing of nano-zirconia toughened alumina ceramics (nano-ZTA) is carried out. According to theoretical analysis, TUVAG may obtain higher machining efficiency and better surface quality. Especially, experimental results show it may obtain the compressive stress in the finished surface of nano-ZTA that may restrain the expansion of surface microcrack, and surface residual stress of nano-ZTA under TUVAG differs from that under diamond grinding, and TUVAG may obtain the better surface quality of nano-ZTA than diamond grinding, as is characterized by scanning electronic microscope (SEM). As a result, it is good for TUVAG as a kind of processing method for nano-ZTA.

Research of Surface Formation of Two Dimensional Ultrasonic Vibration Assisted Grinding of Nano-ZrO2 Ceramics

2013 ◽  
Vol 820 ◽  
pp. 204-207
Author(s):  
Yan Yan Yan ◽  
Qi Wang ◽  
Bo Zhao
Keyword(s):  
Surface Quality ◽  
Ultrasonic Vibration ◽  
Two Dimensional ◽  
Diamond Grinding ◽  
Kinematical Model ◽  
Finished Surface ◽  
Ultrasonic Assisted ◽  
Machining Of Ceramics ◽  
Ultrasonic Vibration Assisted Grinding

Two dimensional ultrasonic vibration assisted grinding (TDUVG) is analyzed based on theoretical analysis of the cutting trace of a grain in the finished surface, and it gives the kinematical model of single grit during TDUVG, and the condition of the separate cutting is established, so two dimensional ultrasonic vibration are introduced into the system, which helps to form good machining way. Then TDUVG is applied in the ultra-precise machining of nanoZrO2 ceramics, and grinding experiments on surface quality of nanoZrO2 ceramics were carried out using diamond grinding both with and without ultrasonic vibration. Experimental results show that the surface quality after two dimensional ultrasonic assisted grinding is superior to that of diamond grinding. As a result, it is suitable for the ultra-precise machining of ceramics.

Research on the Fracture Phenomenon of Zirconia-Toughened Alumina Ceramics under Ultrasonic Vibration

2010 ◽  
Vol 455 ◽  
pp. 156-160
Author(s):  
Yan Yan Yan ◽  
Bo Zhao ◽  
Jun Li Liu
Keyword(s):  
Ultrasonic Vibration ◽  
Surface Integrity ◽  
Normal Load ◽  
Alumina Ceramics ◽  
Ceramic Specimen ◽  
Ceramic Fracture ◽  
Propagation Behavior ◽  
Ultrasonic Vibration Assisted Grinding ◽  
Zirconia Toughened Alumina ◽  
Working Efficiency

A study of the fracture phenomenon of zirconia-toughened alumina (ZTA) ceramics was carried. It analyzes the mechanisms of crack propagation of ZTA ceramics, and constructs fracture experiments of ZTA ceramics, so the propagation behavior on fracture in ZTA ceramics was investigated according to the experiment. By contrast, intercrystalline fracture happed in V-shaped groove of ceramic specimen under normal load without ultrasonic vibration during ceramic fracture, and transcrystalline fracture happed in V-shaped groove of ceramic specimen under normal load with ultrasonic vibration during ceramic fracture. Furthermore, the loading force of ceramic specimen under normal load with ultrasonic vibration is smaller than that under normal load without ultrasonic vibration all other conditions being equal. The results of fracture experiment prove that ultrasonic vibration assisted is good for the fracture of ceramic specimen, and it also proves that ultrasonic vibration assisted grinding may raise the working efficiency and improve surface integrity of ceramics from the standpoint of the fracture.

Test Research on the Surface Residual Stress of Dimensional Ultrasonic Vibration Grinding for Al2O3/ZrO2(n)

2011 ◽  
Vol 295-297 ◽  
pp. 78-82
Author(s):  
Yan Wu ◽  
Er Geng Zhang ◽  
Wen Zhong Nie
Keyword(s):  
Residual Stress ◽  
Tensile Stress ◽  
Ultrasonic Vibration ◽  
Ground Surface ◽  
Ductile Deformation ◽  
Grinding Wheel ◽  
Ceramic Surface ◽  
Two Dimensional ◽  
Surface Residual Stress ◽  
Xrd Diffraction

Based on the research for the structure of the ceramic nanocomposites’ intragranular for Al2O3/ZrO2(n)，we did the test by the workpiece two-dimensional vibration grinding(WTDUVG), and focus on analyzing the characteristic and the effect element of the two-dimensional ultrasonic vibration grinding ceramic surface residual stress by the XRD diffraction. The result show that ceramic dimensional ultrasonic vibration grinding surface tensile stress is less than the same conventional grinding (CG) surface under tensile stress; two-dimensional ultrasonic vibration grinding surface residual compressive stress than conventional ground surface residual stress under the same grinding. Material removal mechanism of the grinding nature of the surface residual stress, when the material removaled by ductile deformation, grinding surface equal residual stress; when the material removaled by brittle- ductile mixed mode, the grinding surface tensile stress reduced, because the fracture of the ground surface, tensile stress released. As a results, the grit size of grinding wheel, Grinding depth and workpiece mechanical properties are the main technology factors affected the nature and size of the residual stress of ground surface.

Surface Phase Transformation Analysis of Nanozirconia Toughened Alumina Ceramics under Two-Dimentional Ultrasonic Vibration Grinding

2010 ◽  
Vol 42 ◽  
pp. 259-262
Author(s):  
Yan Yan Yan ◽  
Pei Lin Xu ◽  
Bo Zhao
Keyword(s):  
Phase Transformation ◽  
Ultrasonic Vibration ◽  
Xrd Analysis ◽  
Processing Method ◽  
Surface Phase ◽  
Alumina Ceramics ◽  
Processing Property ◽  
Transformation Ratio ◽  
Surface Phase Transformation ◽  
Ultrasonic Vibration Assisted Grinding

Based on good processing property of two-dimentional ultrasonic vibration assisted grinding (TUVAG), phase transformation in the grinding surface of nanozirconia toughened alumina ceramics (ZTA ceramics) is studied by XRD analysis. Experimental results show different processing method and grinding depth may lead to surface phase transformation of ZTA ceramics. Under the same grinding parameters, phase transformation ratio of grinding surface under TUVAG is higher than that under diamond grinding (DG), and its phase transformation ratio increases with the increasing of grinding depth. Phase transformation ratio can effectively inhibit generation and expansion of microcracks of grinding surface.

Study on Boring Small Hole of Stainless Steel Dryly by Ultrasonic Vibration Double Cutter

2012 ◽  
Vol 490-495 ◽  
pp. 1551-1554
Author(s):  
Jian Zhong Zhang ◽  
Xin Wang ◽  
Yue Zhang
Keyword(s):  
Stainless Steel ◽  
Surface Quality ◽  
High Precision ◽  
Ultrasonic Vibration ◽  
Cutting Temperature ◽  
Small Hole ◽  
Dry Cutting ◽  
Shape Precision ◽  
Process System

It has been one of the difficulties that high-precision small hole on stainless steel is machined. The supersonic vibration boring acoustic system is installed in the lathe. The supersonic wave energy applies to tool to create pulse power on the cutting process. The separation vibration cutting is achieved by the pulse force. The comparative tests on boring surface quality are carried. The quality of surface machined by this method is compared to that by grinding. This cutting is the green cutting. The boring process system is stability. The cutting force is greatly reduced. The cutting temperature is at room temperature. The tool life is greatly increased. Surface quality and shape precision is greatly improved. The regulations of the ultrasonic vibration boring dry cutting of stainless steel are also summarized. The test results show that the ultrasonic vibration boring by double cutter is of very superior cutting mechanism and is a high-precision thin - long deep - hole machining of stainless steel materials, efficient cutting methods.

Study on Surface Quality of Nano ZrO2 Ceramics in Grinding by the Aid of Ultrasonic Vibration

2006 ◽  
Vol 315-316 ◽  
pp. 190-194 ◽  
Author(s):  
Dao Hui Xiang ◽  
Y.P. Ma ◽  
Bo Zhao ◽  
Ming Chen
Keyword(s):  
Residual Stress ◽  
Ultrasonic Vibration ◽  
High Efficiency ◽  
X Ray Diffraction ◽  
Ultrasonic Grinding ◽  
Surface Character ◽  
Excellent Mechanical Property ◽  
Finished Surface ◽  
Conventional Grinding

Nano ceramics possesses excellent mechanical property and physical characteristics in contrast to conventional engineering ceramics, so it has tremendous application prospect. Adopting ultrasonic composite processing we describe the influences of grinding speed, grinding depth, wheel granularity and no-spark grinding times on the surface roughness of nano ZrO2 ceramics. By means of SEM and AFM the surface character and critical ductile grinding depth of nano ZrO2 ceramics in the condition of conventional and ultrasonic grinding are also discussed. At last, the residual stress of surface and crystalline phase transformation under the condition of conventional grinding and ultrasonic vibration grinding were analyzed by X-ray diffraction. The research indicated that ultrasonic vibration grinding could obtain nano finished surface with high efficiency. The residual stress of nano ZrO2 ceramics surface is determined much by different grinding styles.

Relationship between Electrical Parameters in Combined EDM and Surface Quality

2010 ◽  
Vol 42 ◽  
pp. 436-439 ◽  
Author(s):  
Xin Long Kang ◽  
Dong Man Yu ◽  
Hui Guo ◽  
Chang Pei Shang
Keyword(s):  
Surface Quality ◽  
Ultrasonic Vibration ◽  
Experimental Results ◽  
Development Prospect ◽  
Electrical Parameters ◽  
Machined Surface ◽  
Process Characteristics ◽  
The Law

This paper presents a deep analysis for the effects of the principles and Electrical Parameters of ultrasonic vibration aided EDM in gas on the roughness of finish machined surface by briefly describing the principles and process characteristics of EDM and combined ultrasonic discharge machining technology, and qualitatively obtains the law of the effects of electrical parameters on the quality of machined surface from the analysis of experimental results. The comparison among the three EDM methods shows the superiority and development prospect of ultrasonic vibration aided EDM in gas.

scholarly journals On the Grinding Performance of Alumina Wheels in Ultrasonic Vibration-Assisted Grinding of Hardened GCr15 Steel

2021 ◽  
Author(s):  
Yutong Qiu ◽  
Biao Zhao ◽  
Yang Cao ◽  
Wenfeng Ding ◽  
Yucan Fu ◽  
...  
Keyword(s):  
Surface Quality ◽  
Ultrasonic Vibration ◽  
Grinding Force ◽  
Grinding Wheel ◽  
Wear Property ◽  
Wheel Wear ◽  
Machined Surface ◽  
Gcr15 Steel ◽  
Abrasive Grains ◽  
Ultrasonic Vibration Assisted Grinding

Abstract Composite manufacturing with multiple energy fields is an important source of processing technology innovation. In this work, comparative experiments on the conventional grinding (CG) and ultrasonic vibration-assisted grinding (UVAG) of hardened GCr15 steel were conducted with WA wheel. The grinding wheel wear patterns and chips were characterized. In addition, grinding force, force ratio, and ground surface quality were investigated to evaluate wheel performance. Results illustrate that the interaction between abrasive grains and workpiece in UVAG process has the characteristics of high frequency and discontinuity. The wear property of abrasive grains is changed and the grinding force is decreased because the generation of micro-fracture in abrasive grains improves the grinding wheel self-sharpening. Better surface quality is obtained, the surface roughness is reduced by up to 18.96%, and the number of defects on the machined surface is reduced through the superior reciprocating ironing of UVAG. Accordingly, WA wheel performance is improved by UVAG.

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