Study on electroless composite plating for an Ni P bond micro diamond wheel

Acoustic emission (AE) phenomenon has a direct relationship with the interaction of tool and material which makes AE the most sensitive one among various process variables. However, its prominent sensitivity also means the characteristics of random and board band. Feature representation is a difficult problem for AE-based monitoring and determines the accuracy of monitoring system. It is knottier for the situation of using diamond wheel grinding optical components, not only because of the complexity of grinding process but also the high requirement on surface and subsurface quality. This paper is dedicated to AE-based condition monitoring of diamond wheel during grinding brittle materials and feature representation is paid more attention. AE signal of brittle-regime grinding is modeled as a superposition of a series of burst-type AE events. Theory analysis manifested that original time waveform and frequency spectrum are all suitable for feature representation. Considering the convolution form of b-AE in time domain, a convolutional neural network with original time waveform of AE signals as the input is built for multi-class classification of wheel state. Detailed state division in a wheel’s whole life cycle is realized and the accuracy is over 90%. Different from the overlapping in time domain, AE components of different crack mechanisms are probably separated in frequency domain. From this point of view, AE spectrums are more suitable for feature extraction than the original time waveform. In addition, the time sequence of AE samples is essential for the evaluation of wheel’s life elapse and making use of sequential information is just the idea behind recurrent neural network (RNN). Therefore, long short-term memory (LSTM), a special kind of RNN, is used to build a regression prediction model of wheel state with AE spectrums as the model input and satisfactory prediction accuracy is acquired on the test set.

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Precision Grinding of Structured Tungsten Carbide Mold

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.497.15 ◽

2012 ◽

Vol 497 ◽

pp. 15-19 ◽

Cited By ~ 2

Author(s):

Hirofumi Suzuki ◽

Tatsuya Furuki ◽

Mutsumi Okada ◽

Yutaka Yamagata ◽

Shinya MORITA

Keyword(s):

Tungsten Carbide ◽

Power Efficiency ◽

Fresnel Lens ◽

Rare Metal ◽

Diamond Wheel ◽

Precision Grinding ◽

Form Accuracy ◽

Molding Method ◽

Grinding Method ◽

Glass Lens

Demands of glass Fresnel lens is increasing in solar panel in order to increase power efficiency. Glass lens is usually molded by glass molding method with tungsten carbide molds. In this study, large Fresnel lens molds made of tungsten carbide are tested to be ground by simultaneous 2-axis (Y, Z) controlled grinding method. The resinoid bonded diamond wheel was trued with a rare metal truer to improve the sharpness of the wheel edge. In the grinding test of the tungsten carbide mold, a form accuracy of less than 0.8 μm P-V and surface roughness of 18 nm Rz were obtained, and it is clarified that the proposed grinding method is useful for the Fresnel grinding.

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The Influences of the Plating’s Hardness, Abrasion and Antifriction Property Caused by the Adding of Nano- Al2O3 and PTFE

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.557-559.1683 ◽

2012 ◽

Vol 557-559 ◽

pp. 1683-1686 ◽

Cited By ~ 1

Author(s):

Xiao Feng Xu ◽

Wen Bin Yao ◽

Jiu Hua Xu ◽

Wei Zhang ◽

Lin Yang ◽

...

Keyword(s):

Wear Resistance ◽

Antifriction Property ◽

Chemical Plating ◽

Composite Plating ◽

Plating Solution ◽

Alloy Plating

Composite plating Ni-P-PTFE- nano- Al2O3was made by adding nano-scaled Al2O3and PTFE into chemical plating Ni-P alloy plating solution. The influences of the plating material’s hardness, abrasion and antifriction property caused by the additive amount of nano- Al2O3and PTFE were studied in the paper. The results indicate that the composite plating’s hardness, wear resistance and antifriction can be greatly improved by adding nano- Al2O3and PTFE into it.

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Chemically Assisted Machining of Ceramics

Journal of Tribology ◽

10.1115/1.2928857 ◽

1994 ◽

Vol 116 (3) ◽

pp. 423-429 ◽

Cited By ~ 12

Author(s):

J. C. Wang ◽

S. M. Hsu

Keyword(s):

Material Removal ◽

Removal Rate ◽

High Hardness ◽

Chemical Compounds ◽

Surface Damage ◽

Diamond Wheel ◽

Halogenated Hydrocarbons ◽

Ceramic Machining ◽

Machining Of Ceramics ◽

Machining Fluids

Ceramics are hard and brittle. Machining such materials is time-consuming, difficult, and expensive. Current machining technology requires stiff machine, high hardness tools, and small material removal rates to minimize surface damage. This study demonstrates the feasibility of a novel ceramic machining concept that utilizes chemical reactions at the tool-workpiece interface to reduce the stress and minimize the surface damage. A series of cutting tests using a diamond wheel on silicon nitride with different chemical compounds has been performed. The results demonstrate that by using different chemistries, the material removal rate and the surface finish of the machined ceramic can be significantly altered. Some halogenated hydrocarbons show a significant improvement over some commercial machining fluids currently in use.

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An experimental investigation of temperatures and energy partition in grinding of cemented carbide with a brazed diamond wheel

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-011-3706-7 ◽

2011 ◽

Vol 61 (1-4) ◽

pp. 117-125 ◽

Cited By ~ 15

Author(s):

You Ji Zhan ◽

Xi Peng Xu

Keyword(s):

Experimental Investigation ◽

Diamond Wheel ◽

Cemented Carbide ◽

Energy Partition

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Study on micro-hardness of electroless composite plating of Ni-P with SiC nano-particles

10.1117/12.780124 ◽

2007 ◽

Author(s):

Yong Sun ◽

Zhaoguo Zhang ◽

Jiamin Li ◽

Donghui Xu

Keyword(s):

Nano Particles ◽

Micro Hardness ◽

Composite Plating

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Research on Grinding Force of Zirconia Internal Grinding with Resin Bond Diamond Wheel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1136.30 ◽

2016 ◽

Vol 1136 ◽

pp. 30-35

Author(s):

He Wang ◽

Ke Zhang ◽

Yu Hou Wu ◽

Hong Song

Keyword(s):

Grain Size ◽

Surface Quality ◽

Diamond Wheel ◽

Grinding Force ◽

Wheel Speed ◽

Zirconia Ceramic ◽

Machined Surface ◽

Research Results ◽

Internal Grinding ◽

Machined Surface Quality

The zirconia parts are limited by machined surface quality. The grinding force is one of the most important parameters of grinding and has effects on surface quality. The MK2710 grinder and resin bond diamond wheels were used in zirconia grinding. The grinding force was obtained by Kistler dynamometer. The paper focused on wheel speed and grain size on grinding force, and examined the surface by SEM. The research results indicated that decreasing the grain size, the grinding force increased and the surface quality improved, and increasing wheel speed could decrease grinding force to improve grinding surface quality. The results can improve zirconia ceramic parts surface quality and promote application.

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Ultra-precision grinding of 4H-SiC wafer by PAV/PF composite sol-gel diamond wheel

Advances in Mechanical Engineering ◽

10.1177/16878140211044929 ◽

2021 ◽

Vol 13 (9) ◽

pp. 168781402110449

Author(s):

Kaiping Feng ◽

Tianchen Zhao ◽

Binghai Lyu ◽

Zhaozhong Zhou

Keyword(s):

Surface Roughness ◽

Low Temperature ◽

Polyvinyl Alcohol ◽

Feed Rate ◽

Hot Pressing ◽

Phenolic Resin ◽

Sol Gel ◽

Diamond Wheel ◽

Sic Wafer ◽

Better Than

To eliminate the deep scratches on the 4H-SiC wafer surface in the grinding process, a PVA/PF composite sol-gel diamond wheel was proposed. Diamond and fillers are sheared and dispersed in the polyvinyl alcohol-phenolic resin composite sol glue, repeatedly frozen at a low temperature of −20°C to gel, then 180°C sintering to obtain the diamond wheel. Study shows that the molecular chain of polyvinyl alcohol-phenolic resin is physically cross-linked to form gel under low-temperature conditions. Tested by mechanical property testing machines, microhardness tester, and SEM. The results show that micromorphology is more uniform, the strength of the sol-gel diamond wheel is higher, the hardness uniformity is better than that of the hot pressing diamond wheel. Grinding experiments of 4H-SiC wafer were carried out with the prepared sol-gel diamond wheel. The influence of grinding speed, feed rate, and grinding depth on the surface roughness was investigated. The results showed that by using the sol-gel diamond wheel, the surface quality of 4H-SiC wafer with an average surface roughness Ra 6.42 nm was obtained under grinding wheel speed 7000 r/min, grinding feed rate 6 µm/min, and grinding depth 15 µm, the surface quality was better than that of using hot pressing diamond wheel.

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Experimental Study of Grinding Characteristics on SiCp/Al Composites

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.487.135 ◽

2011 ◽

Vol 487 ◽

pp. 135-139 ◽

Cited By ~ 3

Author(s):

Li Zhou ◽

Shu Tao Huang ◽

Xiao Lin Yu

Keyword(s):

Volume Fraction ◽

Ground Surface ◽

Diamond Wheel ◽

Feed Speed ◽

Grinding Forces ◽

Electron Microscopic ◽

Sic Particles ◽

Scanning Electron Microscopic ◽

Grinding Machine ◽

Sic Particle

This paper deals with the grinding performances of SiCp/Al composites with higher volume fraction and larger SiC particle. The effects of the grinding parameters on the grinding force, removal mechanisms of SiC particles have been investigated. The grinding tests were carried out by using diamond wheel on surface grinding machine. The results indicate that the feed speed of worktable has more significant effect on the grinding forces than that of grinding depth. The scanning electron microscopic images of the machined surfaces indicate that the material removal of SiC particles was primarily due to the failure of the interface between the reinforcement and matrix, and resulting from microcracks along the interface and many fracture or crushed SiC particles on the ground surface.

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