scholarly journals Systematic Monitoring and Evaluating the Wear of Alumina Wheel When Grinding the Workpiece of Cr12

Complexity ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Fangyi You ◽  
Wang Zhou ◽  
Xuan Wang ◽  
Qiulian Dai
Keyword(s):  
Surface Topography ◽  
Image Recognition ◽  
Material Removal ◽  
Grinding Force ◽  
Projection Area ◽  
Grinding Wheel ◽  
Grinding Temperature ◽  
Machining Efficiency ◽  
Wheel Surface

The performance of the grinding wheel demonstrably affects the machining efficiency and the quality of the workpiece. Therefore, it is essential to evaluate the wear of the wheel and then operate the dressing or replacement in time. The wear procession of the wheel was monitored and evaluated systematically in this paper. A surface grinding experiment was performed by using an alumina wheel to grind the workpiece made of Cr12. The grinding force and the grinding temperature were monitored and measured while the wheel grinds the workpiece. The surface topography of the wheel was also being observed. The distribution of the gray value of pixels in the image of the wheel surface was analyzed by the method of the histogram. Processing of the binary image of the wheel was performed after determining the gray threshold of the gray value. Then, the blockading and the wearing area on the grinding wheel were calculated. Moreover, the relation of the projection area of a single abrasive derived from theory and derived by image recognition was studied. The results of the grinding experiment show that wheel performance degradation occurs when the material removal volume reaches 210 mm3/mm. At this time, the ratio of blockage area on the grinding wheel reaches 13.4%. The percentage of the wearing area is 9.5%. The method of image recognition combined with grinding temperature is workable to realize monitoring and evaluating the wear of wheels on site without unloading them.

scholarly journals Study on the Effect of Grinding Pressure on Material Removal Behavior Performed on a Self-Designed Passive Grinding Simulator

2021 ◽  
Vol 11 (9) ◽  
pp. 4128
Author(s):  
Peng-Zhan Liu ◽  
Wen-Jun Zou ◽  
Jin Peng ◽  
Xu-Dong Song ◽  
Fu-Ren Xiao
Keyword(s):  
Residual Stress ◽  
Surface Roughness ◽  
Service Life ◽  
Material Removal ◽  
Removal Rate ◽  
Grinding Force ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Grinding Temperature ◽  
Grinding Efficiency

Passive grinding is a new rail grinding strategy. In this work, the influence of grinding pressure on the removal behaviors of rail material in passive grinding was investigated by using a self-designed passive grinding simulator. Meanwhile, the surface morphology of the rail and grinding wheel were observed, and the grinding force and temperature were measured during the experiment. Results show that the increase of grinding pressure leads to the rise of rail removal rate, i.e., grinding efficiency, surface roughness, residual stress, grinding force and grinding temperature. Inversely, the enhancement of grinding pressure and grinding force will reduce the grinding ratio, which indicates that service life of grinding wheel decreases. The debris presents dissimilar morphology under different grinding pressure, which reflects the distinction in grinding process. Therefore, for rail passive grinding, the appropriate grinding pressure should be selected to balance the grinding quality and the use of grinding wheel.

Grinding Performance of Permeated Grinding Wheel

2011 ◽  
Vol 189-193 ◽  
pp. 121-124
Author(s):  
Wei Li ◽  
Bin Hu ◽  
Ming Ming Ma
Keyword(s):  
Surface Quality ◽  
Solid Lubricant ◽  
Ground Surface ◽  
Grinding Force ◽  
Grinding Wheel ◽  
Grinding Temperature ◽  
Chemical Additives ◽  
Wheel Surface ◽  
Lubrication Film ◽  
Grinding Efficiency

The permeated grinding wheel was a new kind of grinding wheel, which was permeated by the chemical additives and solid lubricant into the interior gaps of the grinding wheel. Therefore, the grinding wheel can form a lubrication film on the surface of the grinding wheel. This grinding wheel has some good features, such as lower grinding temperature, smaller grinding force, higher life of the grinding wheel, and can prevent the adhesion of chip onto the grinding wheel surface. The experimental results indicate that the ground surface quality and grinding efficiency have been remarkably improved for more hard-to-cut materials.

Grinding Wheel Surface Topography for Multiple Pass With Incremental Depth of Cut of Rotary Diamond Dresser

2015 ◽  
Author(s):  
M. A. K. Chowdhury
Keyword(s):  
Surface Topography ◽  
Removal Efficiency ◽  
Material Removal ◽  
Cutting Tools ◽  
Depth Of Cut ◽  
Grinding Wheel ◽  
Simulation Tool ◽  
Wheel Surface ◽  
Working Surface ◽  
Multiple Pass

Grinding is often used material removal process in manufacturing. A grinding wheel has abrasive grains on its working surface and the material removal efficiency of a grinding wheel decreases with grinding operations. To restore the material removal efficiency of a grinding wheel, dressing is performed. There are several types of dressing methods and among these different methods, mechanical dressing is widely performed. In mechanical dressing, rotary diamond dresser is one of the effective dressers. The grinding wheel surface topography induced from dressing effect the performance of subsequent grinding operation. Therefore, grinding wheel preparation conditions, i.e., dressing conditions and consequently the grinding wheel surface topography have effect on grinding performance. The actual cutting points on diamond grits of a rotary diamond dresser are micro cutting tools which interact with the working surface of the grinding wheel. This interaction of the diamond grits of rotary diamond dresser restores the material removal efficiency of the grinding wheel. In precision engineering, multiple pass and incremental depth of cut of dresser is applied to increase the overall efficiency. This study deals with the surface topography of grinding wheel due to multiple pass and incremental depth of cut dressing operations by rotary diamond dresser. The objective of a dressing operation is to sharpen and protrude the abrasive grits embedded on the working surface of a grinding wheel. To achieve this, the rotary dresser should come in contact with all parts of the working surface of a grinding wheel without hitting the same location repeatedly. A simulation tool has been developed correlating the rotary diamond dresser parameters, grinding wheel parameters and dressing process parameters. In this research, a method is developed which enables one to determine the trajectories of dresser on the working surface of a grinding wheel (i.e., surface topography of grinding wheel) after performing dressing operations multiple times wherein the depth of cut is increased after each pass. A modified simulation is used to visualize surface topography of a grinding wheel for multiple pass with incremental depth of cut. The simulation tool also determines the dressing ratio (percent of working area of grinding wheel that has been dressed) and the areas which are dressed twice or more. Using the modified simulation tool, some strategies, i.e., single pass and multi pass dressing with incremental depth of cut is identified for determining optimal dressing conditions (the dressing conditions for which the dresser covers all circumferential surface of a grinding wheel without dressing the same area repeatedly).

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.

Evaluation of the Working Surface of the Grinding Wheel Using Speckle Image Analysis

2015 ◽  
Author(s):  
Arunachalam Narayanaperumal ◽  
Vijayaraghavan Lakshmanan
Keyword(s):  
Surface Quality ◽  
Surface Condition ◽  
Grinding Wheel ◽  
Optical Parameters ◽  
Wheel Surface ◽  
Wheel Wear ◽  
Speckle Image ◽  
Periodic Monitoring ◽  
Grinding Machine

The surface quality of the ground components mainly depends on the surface condition of the grinding wheel. The surface condition of the grinding wheel changes with grinding time due to wheel wear and loading. The excessive wear and loading increases the cutting force and the temperature. This in turn affects the quality of the produced component. Hence periodic monitoring of the grinding wheel surface is essential to avoid the production of the defective components. In this paper, an attempt is made to study the changes in the grinding wheel surface condition using the laser scattered images. The simple speckle imaging arrangement is fabricated and fitted into the grinding machine to capture the images of the grinding wheel after each 100 passes. The fresh wheel expected to scatter more light due to higher roughness and porosity. On the other hand, the completely glazed and worn-out wheel scatters the light less due to smoother surface. Thus, speckle image intensity distribution captures the changes in the grinding wheel surface condition. The optical parameters evaluated from the speckle images clearly indicating the changes in the grinding wheel condition. This method can be utilized to evaluate the grinding wheel condition to improve the surface quality of the component produced.

Research on On-Machine 3D Measuring System of Grinding Wheel Surface Topography by Binocular Stereopsis

2016 ◽  
Vol 2016.11 (0) ◽  
pp. D02
Author(s):  
Hirotaka OJIMA ◽  
Kazuki KOMATSUZAKI ◽  
Libo ZHOU ◽  
Jun SHIMIZU ◽  
Teppei ONUKI
Keyword(s):  
Surface Topography ◽  
Measuring System ◽  
Grinding Wheel ◽  
Wheel Surface

Visualization of Grinding Wheel Surface Topography for Multiple Passes of Rotary Diamond Dresser

2012 ◽  
Vol 565 ◽  
pp. 222-227 ◽  
Author(s):  
M.A.K. Chowdhury ◽  
Jun’ichi Tamaki ◽  
Akihiko Kubo ◽  
A.M.M. Sharif Ullah
Keyword(s):  
Surface Topography ◽  
Grinding Wheel ◽  
Visualization Tool ◽  
Visualization Method ◽  
Wheel Surface ◽  
Design Variables

The grinding wheel surface topography after dressing is an indicator of the effectiveness of dressing operation and, thereby, the effectiveness of grinding as a whole. During dressing, the dresser travels the grinding wheel surface several times so that the dresser grits could hit all most all points on the circumference of the grinding wheel. But the same point should not be hit several times by the dressing grits. This study describes a method and tool for visualizing the grinding wheel surface topography for multiple passes of rotary diamond dresser. Using the proposed visualization method and tool, one can determine the effectiveness of certain dressing conditions beforehand. In addition, the visualization tool can be used for optimizing the design variables of a rotary diamond dresser.

Influence of granularity of grinding stone on grinding force and material removal in the rail grinding process

2018 ◽  
Vol 233 (2) ◽  
pp. 355-365 ◽  
Author(s):  
Wen-jian Wang ◽  
Kai-kai Gu ◽  
Kun Zhou ◽  
Zhen-bing Cai ◽  
Jun Guo ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Friction Coefficient ◽  
Material Removal ◽  
Grinding Force ◽  
Grinding Process ◽  
Grinding Temperature ◽  
Material Removal Mechanisms ◽  
Rail Grinding ◽  
Grinding Efficiency ◽  
Grinding Stone

The objective of this study is to explore the influence of grinding stone granularity on the grinding force and rail material removal behaviors using a rail grinding friction machine. The results indicate that with the increase in granularity, the grinding force, and friction coefficient in the grinding interface obviously increase, which brings about a rise in the hardness and grinding temperature-rise of rail specimens. The increase in the grinding stone granularity causes a fall in the grinding volume and surface roughness of rail materials and brings about stronger vibration in the grinding interface owing to different material removal mechanisms. In view of the experimental results, the optimization of grinding stone granularity is significant for improving the rail grinding efficiency and surface quality.

Sign in / Sign up

Export Citation Format

Share Document