An Investigation of Grinding and Wheel Loading Using Acoustic Emission

1984 ◽  
Vol 106 (1) ◽  
pp. 28-33 ◽  
Author(s):  
D. Dornfeld ◽  
He Gao Cai
Keyword(s):  
Acoustic Emission ◽  
Chip Thickness ◽  
Process Efficiency ◽  
Grinding Wheel ◽  
Force Measurements ◽  
Wheel Wear ◽  
Emission Signal ◽  
Wheel Loading ◽  
Loss Of Contact ◽  
Higher Sensitivity

This paper investigates the potential for using acoustic emission signal analysis for a monitoring technique for process automation as well as a sensitive tool for investigation of grinding fundamentals. The acoustic emission generated during the grinding process is analyzed to determine its sensitivity to process efficiency and the condition of the grinding wheel. Acoustic emission from surface grinding is used to measure wear-related loading of the grinding wheel and sparkout (or loss of contact) between the wheel and the work surface. A discussion of energy dissipation in grinding and the generation of acoustic emission is included. This investigation showed that the acoustic emission energy, (RMS)2, increases with the combined effects of wheel wear and loading, the signal energy, (RMS)2, is a function of the undeformed chip thickness and that the signal accurately detects work-wheel contact and sparkout with a higher sensitivity than force measurements.

A Study on Monitoring System for Grinding Wheel Status Based on Acoustic Emission Technology

2011 ◽  
Vol 52-54 ◽  
pp. 2051-2055
Author(s):  
Pei Jiang Li ◽  
Ting You
Keyword(s):  
Acoustic Emission ◽  
High Speed ◽  
Grinding Wheel ◽  
Signal Acquisition ◽  
Wheel Wear ◽  
Processing Efficiency ◽  
Emission Signal ◽  
Grinding Wheel Wear ◽  
Upper Computer

The grinding wheel wear status is an important guarantee for the processing efficiency and processing quality of precision and super precision grinding. In this paper, a USB acoustic emission signal acquisition system is designed for online monitoring of grinding wheel status. In the system, CPLD is used as the controller, and a high-speed A/D converter is used to implement the synchronous acquisition of acoustic emission array signals. The collected data are sent into FIFO, and CY7C68013A is used for USB data transmission with upper computer. The sampling frequency of the system can be 10 MHz, and USB transmission speed can reach 40M/S. It is proved that it can meet the monitoring requirements of grinding wheel wear status well by the grinding processing.

A Study on Electrolytic In-Process Dressing (ELID) Grinding of Sapphire With Acoustic Emission

2009 ◽  
Author(s):  
Peidong Han ◽  
Ioan D. Marinescu ◽  
Anil Srivastava
Keyword(s):  
Acoustic Emission ◽  
Surface Finish ◽  
High Efficiency ◽  
High Hardness ◽  
Processing Parameters ◽  
Great Promise ◽  
Grinding Wheel ◽  
Wheel Wear ◽  
Elid Grinding ◽  
Wheel Loading

Single crystal sapphire is of significant interest due to its combination of excellent optical, electrical, and mechanical properties. However, fine grinding of sapphire is quite challenging because of its high hardness and low fracture toughness, making it sensitive to cracking. Wheel loading is a common problem in conventional grinding of hard and brittle materials. ELID grinding shows great promise in achieving a mirror surface finish at a relatively high efficiency. ELID grinding of sapphire was investigated using acoustic emission. The effects of processing parameters on surface finish and acoustic emission signals were evaluated. Correlations were found among the dressing current intensity, surface finish and acoustic emission signals. A smoother surface was obtained using a higher dressing current at the cost of a higher wheel wear rate. The wheel wear mechanism in ELID grinding of sapphire was dominated by bond fracture because the bond strength is reduced by electrolysis. Results indicate that the acoustic emission technique has the potential to be used for monitoring ELID grinding process, detecting the condition of the grinding wheel, and investigating the mechanisms of ELID grinding.

Wear Monitoring on Microcrystalline Aluminum Oxide Grinding Wheels on Profile Grinding with the Aid of Acoustic Emission

2014 ◽  
Vol 894 ◽  
pp. 95-103 ◽  
Author(s):  
Lucas Benini ◽  
Walter Lindolfo Weingaertner ◽  
Lucas da Silva Maciel
Keyword(s):  
Acoustic Emission ◽  
Wear Behavior ◽  
Grinding Wheel ◽  
Wheel Wear ◽  
Profile Grinding ◽  
Grinding Wheel Wear ◽  
Abrasive Grains ◽  
Profile Deviation ◽  
Synthetic Materials ◽  
External Cylindrical Grinding

The localized wear on grinding wheel edges is a common phenomenon on profile grinding since the abrasive grains are less attached to the bond. The grinding wheel wear depends heavily on the process parameters, workpiece and wheel composition, causing changes on the process and profile deviation behaviors. In order to cope with these uncertainties, many natural and synthetic materials have been used in different grinding processes. However, the influence of mixed compositions of different types of abrasive grains on external cylindrical grinding is not well known. In order to assess this relation, a methodology procedure was developed providing an overview of the cinematic edges behavior on a progressive wheel wear. The methodology procedure is based on the acoustic emission technology, using a transducer with a 50 μm radius diamond tip. The tip, when in contact with a rotating grinding wheel, enables the evaluation of the cinematic cutting edges. The abrasive grain density was evaluated for different grinding wheel compositions and specific wear removal values. Furthermore, these results were compared to the profile deviation observed on the same tool, allowing the assessment of the influence of different microcrystalline corundum grains on the overall grinding wheel wear behavior.

Experimental evaluation on grinding wheel wear through vibration and acoustic emission

Wear ◽  
1998 ◽  
Vol 217 (1) ◽  
pp. 7-14 ◽  
Author(s):  
A. Hassui ◽  
A.E. Diniz ◽  
J.F.G. Oliveira ◽  
J. Felipe ◽  
J.J.F. Gomes
Keyword(s):  
Acoustic Emission ◽  
Experimental Evaluation ◽  
Grinding Wheel ◽  
Wheel Wear ◽  
Grinding Wheel Wear

Analysis of the Optical Quartz Lens Centering Process Based on Acoustic Emission Signal Processing and the Support Vector Machine

2021 ◽  
Author(s):  
Chun-Wei Liu ◽  
Shiau-Cheng Shiu ◽  
Kai-Hung Yu
Keyword(s):  
Support Vector Machine ◽  
Acoustic Emission ◽  
Optical Glass ◽  
Removal Rate ◽  
Support Vector ◽  
Grinding Wheel ◽  
Emission Signal ◽  
Sensing Technology ◽  
Acoustic Emission Sensing ◽  
Circularity Error

Abstract A method was proposed for analyzing the optical glass lens centering process, and experiments on biplane quartz lenses were performed to determine the material removal rate (MRR) for the hard, brittle material. This study used acoustic emission–sensing technology to monitor the MRR and reconstruct the original shape of the lens. The MRR was evaluated, and an error of 17.87% was obtained. A Taguchi experiment was combined with signal analysis to optimize the process parameters, and a support-vector machine was trained to classify the quality of the grinding wheel; the model had accuracy 98.8%. By using the proposed analysis method, workpiece quality was controlled to an edge surface roughness of <2 μm, a lens circularity error of <0.01 mm, a crack length of <E0.1, and an optical axis error of <150 μrad.

Theoretical Analysis of Grinding Chatter

1987 ◽  
Vol 109 (4) ◽  
pp. 314-320 ◽  
Author(s):  
T. El-Wardani ◽  
M. M. Sadek ◽  
M. A. Younis
Keyword(s):  
Mathematical Model ◽  
Three Dimensional ◽  
Grinding Wheel ◽  
Process Stability ◽  
Wheel Wear ◽  
Wheel Loading ◽  
Machine Structure ◽  
Theoretical Results ◽  
Simultaneous Variation ◽  
Elastic Characteristics

A mathematical model is proposed for the prediction of the grinding process chatter. It considers the machine structure as a multidegree of freedom system and takes into account various parameters affecting the process stability such as the workpiece and grinding wheel regeneration, wheel loading and its elastic characteristics. This model is based on a nonlinear relationship with the time factor which is introduced by the loading effect. Three-dimensional stability charts were predicted for the simultaneous variation of both the grinding wheel wear and loading. These stability charts relate the grinding wheel and workpiece speeds to the instantaneous limiting width of grinding. The validity of this mathematical model has been assessed with the aid of a series of chatter tests which were carried out in specially designed experiments. These tests show good quantitative and qualitative correlation between the theoretical results and those experimentally obtained. It has been found that the level of stability decreases with time, indicating the possibility of chatter occurring at a stable width of cut.

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