The Orderly and Direction Study of Grinding Wheel Grits Based on Geomorphologic Feature

At present, CNC grinding efficiency has been low, the main reason is the grinding tool-grinding wheel. The service life of grinding wheel is an important element for restricting the grinding efficiency, and the main reason for affecting grinding wheel service life is the distribution of the grinding wheel grits. The chaotic distribution of grinding wheel grits reduces grinding efficiency. This paper analyzes the physical and chemical characteristics of the CBN grits, puts forward that through adding the magnetic field method in the process of electroplating wheel, changes the position and posture of CBN grits on the grinding wheel base body, and makes its an orderly distribution. And thus this method greatly improves the grinding efficiency and service life of the electroplating CBN grinding wheel.

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

Applied Sciences ◽

10.3390/app11094128 ◽

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.

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A Study on the Evaluation Indexes of Wear Process of Electroplated CBN Grinding Wheel

Materials Science Forum ◽

10.4028/www.scientific.net/msf.940.72 ◽

2018 ◽

Vol 940 ◽

pp. 72-76

Author(s):

Fang Quan ◽

Zhi Tong Chen ◽

Qian Tong Li ◽

Huan Ye

Keyword(s):

Service Life ◽

Evaluation Index ◽

Grinding Wheel ◽

Analytic Hierarchy ◽

Wear Process ◽

Evaluation Indexes ◽

Nickel Based Superalloy ◽

And Control ◽

Service Life Cycle ◽

Cbn Grinding Wheel

The wear process of electroplated CBN grinding wheel is difficult to predict and control because of the lack of unified evaluation index of wear degree. This paper investigates the service life cycle of electroplated CBN grinding wheel in grinding of nickel-based superalloy GH4169. The evolution of topography of grinding wheel, diameter of grinding wheel, grinding force and surface roughness are tracked in the wear process. Using the analytic hierarchy process (AHP), the optimal evaluation index of service life of electroplated CBN grinding wheel is proposed.

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Flexural strength of porous ceramic-bonded composites for abrasive tools

MATEC Web of Conferences ◽

10.1051/matecconf/201929800108 ◽

2019 ◽

Vol 298 ◽

pp. 00108

Author(s):

Yu. Bagayskov

Keyword(s):

Porous Ceramic ◽

Major Effect ◽

Strength Properties ◽

Grinding Wheel ◽

Material Strength ◽

High Porosity ◽

Grinding Wheels ◽

Tool Performance ◽

Grinding Tool ◽

Grinding Efficiency

One of the main parameters to measure a grinding tool performance is the material strength. This is especially true for grinding wheels operating at speeds of 35 to 60 m/sec. The grinding wheel performance can also be impaired by its imbalance due to defects in its geometry and nonuniform distribution of weight over the volume. However, a way to improve the grinding efficiency is to use high-porosity low-hardness grinding wheels with lower strength properties. Research shows that the lower the grinding wheel’s strength – the bigger its structure number, the higher the content of burnable pore forming agents. This isespecially applicable to tools made from silicon carbide rather than fromalundum (electric corundum). The particle size of thepore forming agent has no major effect on the grinding wheel strength. Ceramic bonds with better adhesive capacity should be used together with overall improvement of the grinding tool structure.

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Study on the Behavior of the Cast-Iron Bonded Grinding Wheel to Machining Properties of Hard and Brittle Materials

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.24-25.229 ◽

2007 ◽

Vol 24-25 ◽

pp. 229-232

Author(s):

S.L. Ma ◽

Wei Li ◽

Cong Rong Zhu ◽

J. Zhang ◽

H.C. Ye

Keyword(s):

Grain Size ◽

Cast Iron ◽

Tungsten Carbide ◽

Surface Quality ◽

Ground Surface ◽

Grinding Wheel ◽

Different Grain Size ◽

Grinding Efficiency ◽

Machining Properties

Tungsten carbide which is a hard and brittle material was ground by cast-iron bonded diamond wheel with ELID (Electrolytic In-Process Dressing) technique, for the purpose of getting high efficiency, super-precision machining. Three kinds of cast-iron bonded diamond wheels with different grain size were adopted to get different grinding efficiency and surface quality of workpieces. The grinding properties of cast-iron bonded grinding wheels with different grain size and the ground surface quality of tungsten carbide are discussed in this paper. The experiment results indicate that, under the same feeding amount, the grinding efficiency of the wheel with bigger grain size is higher, and it could make the dimension accuracy of the workpiece controllable, but the wheel with smaller grain size could get better ground surface quality. The two grinding phases are decided by the ratio between the size of abrasive grain and the thickness of the oxide layer on the grinding wheel.

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Surface integrity of quenched steel 1045 machined by CBN grinding wheel and SiC grinding wheel

International Journal of Structural Integrity ◽

10.1108/ijsi-03-2016-0011 ◽

2017 ◽

Vol 8 (2) ◽

pp. 179-187 ◽

Cited By ~ 1

Author(s):

Kankan Ji ◽

Xingquan Zhang ◽

Shubao Yang ◽

Liping Shi ◽

Shiyi Wang ◽

...

Keyword(s):

Surface Roughness ◽

Surface Morphology ◽

Compressive Stress ◽

Surface Integrity ◽

Grinding Wheel ◽

Micro Hardness ◽

Content Type ◽

Quenched Steel ◽

Cut Depth ◽

Cbn Grinding Wheel

Purpose The purpose of this paper is to evaluate surface integrity of quenched steel 1045 ground drily by the brazed cubic boron nitride (CBN) grinding wheel and the black SiC wheel, respectively. Surface integrity, including surface roughness, sub-surface hardness, residual stresses and surface morphology, was investigated in detail, and the surface quality of samples ground by two grinding wheels was compared. Design/methodology/approach In the present work, surface integrity of quenched steel 1045 machined by the CBN grinding wheel and the SiC wheel was investigated systematically. All the specimens were machined with a single pass in the down-cutting mode of dry condition. Surface morphology of the ground specimen was observed by using OLYMPUS BX51M optical microscopy. Surface roughness of seven points was measured by using a surface roughness tester at a cut-off length of 1.8 mm and the measurement traces were perpendicular to the grinding direction. Sub-surface micro-hardness was measured by using HVS-1000 digital micro-hardness tester after the cross-section surface was polished. The residual stress was tested by using X-350A X-ray stress analyzer. Findings When the cut depth is increased from 0.01 to 0.07 mm, the steel surface machined by the CBN wheel remains clear grinding mark, lower roughness, higher micro-hardness and higher magnitude of compressive stress and fine microstructure, while the surface machined by the SiC grinding wheel becomes worse with increasing of cut depth. The value of micro-hardness decreases, and the surface roughness increases, and the surface compressive stress turns into tensile stress. Some micro-cracks and voids occur when the sample is processed by the SiC grinding wheel with cut depth 0.07 mm. Originality/value In this paper, the specimens of quenched steel 1045 were machined by the CBN grinding wheel and the SiC wheel with various cutting depths. The processing quality resulted from the CBN grinding wheel is better than that resulted from the SiC grinding wheel.

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Physical and Chemical Deterioration of Reinforced Concrete Reefs in Tongyeong Reefs Coastal Waters, Korea

Marine Technology Society Journal ◽

10.4031/002533208786842552 ◽

2008 ◽

Vol 42 (3) ◽

pp. 110-118 ◽

Cited By ~ 5

Author(s):

H. S. Kim ◽

C. G. Kim ◽

W. B. Na ◽

J. Woo ◽

J. K. Kim

Keyword(s):

Reinforced Concrete ◽

Service Life ◽

Dissolved Oxygen ◽

Extreme Event ◽

Chemical Properties ◽

Chloride Concentration ◽

Concrete Cover ◽

Marine Habitat ◽

Seawater Salinity ◽

Physical And Chemical

As part of a marine habitat enhancement project, the physical and chemical deterioration of reinforced concrete reefs that were fully immersed in Tongyeong waters of Korea was investigated. For the investigation, marine environmental factors such as seawater, salinity, pH, dissolved oxygen, sea-bottom materials, and water depth of the targeted sites were surveyed from 1997 to 2001. Then, four reinforced concrete reefs from four different sites were recovered and tested by using various destructive and nondestructive methods. Based on the observations and test results, it was seen that the reinforced concrete reefs have sound physical and chemical properties, except for chloride concentration and its associated factors. However, because of the lack of dissolved oxygen in the targeted seawaters and its continuous supply, it is concluded that the originally designed service life will be achieved, and in fact the concrete reefs will have an even longer service life than expected. By considering an extreme event such as impact loading under installation and construction, a new minimum concrete cover depth of 40 mm is introduced into practice.

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