The Possibility of Dressless Restoration of Grindactivity in Dry Grinding of Carbon

2008 ◽  
Vol 389-390 ◽  
pp. 356-361 ◽  
Author(s):  
Kazuhito Ohashi ◽  
Y. Sumimoto ◽  
Y. Fujita ◽  
Hiroyuki Hasegawa ◽  
Shinya Tsukamoto
Keyword(s):  
Adhesive Tape ◽  
Hard Carbon ◽  
Wheel Surface ◽  
Removal Method ◽  
Abrasive Grains ◽  
Abrasive Grain ◽  
Grinding Performance ◽  
Dry Grinding

The grinding performance of wheel remarkably decreases by the loading of wheel surface in dry grinding of hard carbon parts. In this report, we propose the removal method of loaded carbon chips in which an adhesive tape is removed with carbon chips after putting on a loaded wheel surface by an elastic roller with the setting load . The removal characteristics are experimentally investigated by analyzing the projecting height of abrasive grains, removal force of adhesive tape and so on. The removal method results in the enough projecting height of abrasive grain.

Effect of Dry Ice Blasting on Removal of Loading Carbon Chips on Wheel Surface

2015 ◽  
Vol 656-657 ◽  
pp. 220-225 ◽  
Author(s):  
Kazuhito Ohashi ◽  
Soziro Murakawa ◽  
Shinya Tsukamoto
Keyword(s):  
Diamond Wheel ◽  
Working Environment ◽  
Wheel Surface ◽  
Dry Ice ◽  
Removal Method ◽  
Abrasive Grains ◽  
Grinding Performance ◽  
Dry Grinding ◽  
Dry Ice Blasting ◽  
The Impact

In dry grinding of hard carbon parts, the grinding performance of wheel is remarkably lost by carbon chips loading on wheel surface. The deterioration in grinding performance of wheel affects the grinding accuracy and efficiency. Generally, the grinding performance of loading wheel recovers by dressing. However, the dressing is not suitable from a viewpoint of the wheel life and the production cost because many abrasive grains having sharp edges under loading carbon chips on wheel surfaces are lost by dressing. In this study, we propose the application of dry ice blasting as a removal method of loading carbon chips. The dry ice is little influence on the working environment because of the quick sublimation of dry ice particles to carbon dioxide. In addition, the dry ice blasting might be suitable for the chip removal method because the dry ice doesn’t remain on wheel surfaces after blasting without the damage of wheel surfaces. The dry ice blasting tests of resinoid bond diamond wheel surface with no grinding performance by loading carbon chips are carried out, and the effects of dry ice blasting on removal of loading carbon chips are investigated, analyzing the protrusion height of abrasive grains, the impact pressure in the dry ice blasting and so on.

Efficiency Investigation of Removal of Loading Carbon Chips on Wheel Surface Using Dry Ice Blasting

2017 ◽  
Vol 749 ◽  
pp. 124-129
Author(s):  
Yuki Ohta ◽  
Soziro Murakawa ◽  
Kazuhito Ohashi
Keyword(s):  
High Efficiency ◽  
Diamond Wheel ◽  
Working Environment ◽  
Wheel Surface ◽  
Dry Ice ◽  
Abrasive Grains ◽  
Grinding Performance ◽  
Dry Grinding ◽  
Sharp Edges ◽  
Dry Ice Blasting

In dry grinding of hard carbon parts, the loading by carbon chips on wheel surface occurs in early grinding process, and the grinding performance of wheel is extremely declined. The deterioration affects the grinding accuracy and efficiency. Therefore, loading is one of the problems that must be resolved for high efficiency and high quality grinding of carbon. Generally, the grinding performance of wheel is recovered by the dressing. However, it’s not suitable from a viewpoint of the wheel life and the production cost because available abrasive grains possessing sharp edges under loading carbon chips on wheel surface are lost by dressing. In this study, we propose the dry ice blasting for removing loading carbon chips on wheel surface. The dry ice particles impact on pressed carbon chips with high pressure and sublimate to carbon dioxide quickly. Therefore, it is little influence on working environment because the dry ice doesn’t remain on wheel surfaces after blasting without the damage. In this report, we carry out the blasting tests of resinoid bond diamond wheel surface without grinding performance by loading carbon chips, and analyzed the effect of nozzle processing speed and nozzle feed pitch on recovering abrasive protrusion. The effective dry ice blasting conditions are investigated for high efficiency removal of loading carbon chips, analyzing the protrusion height of abrasive grains.

Improvement of Grindactivity by Dressless Wheel Treatment in Dry Grinding of Carbon

2009 ◽  
Vol 76-78 ◽  
pp. 94-100 ◽  
Author(s):  
Kazuhito Ohashi ◽  
Y. Sumimoto ◽  
Y. Fujita ◽  
Shinya Tsukamoto
Keyword(s):  
Surface Roughness ◽  
Adhesive Tape ◽  
Hard Carbon ◽  
Wheel Surface ◽  
Dry Grinding ◽  
Stock Removal

The grindactivity of wheel is remarkably lost by the loading of wheel surface in dry grinding of hard carbon parts. In this report, we propose the dressless wheel treatment, in which loading chips are removed with adhesive tape, and experimentally investigate its effect on recovery of grindactivity, analyzing the stock removal, the grinding current and the surface roughness in repeat of grinding cycle with treated and non-treated wheels. The removal and finishing performances of loaded wheel are recovered by the dressless wheel treatment.

The Abrasive Cut-off Operation With Oscillation

1976 ◽  
Vol 98 (2) ◽  
pp. 410-422
Author(s):  
R. Murata ◽  
M. C. Shaw
Keyword(s):  
Rotating Disk ◽  
Tangential Direction ◽  
Wheel Surface ◽  
Continuous Contact ◽  
Heat Flows ◽  
Abrasive Grains ◽  
Abrasive Grain ◽  
Grinding Performance

In the abrasive cut-off operation in which a thin rotating disk is plunged through a workpiece, chips must be stored as a grain traverses the entire width of work being ground. Also, heat flows radially inward from the wheel surface for a longer time the wider the workpiece, thus increasing the tendency to overheat the polymeric bond posts that hold the abrasive grains in place. Oscillation of the workpiece in a tangential direction tends to reduce the length of continuous contact between abrasive grain and work and significantly improves grinding performance when relatively wide workpieces are ground. This paper discusses the more important aspects of the abrasive cut-off operation with oscillation.

High-Efficient Regeneration of Grinding Performance Using Adhesive Films in Dry Grinding of Carbon

2015 ◽  
Vol 656-657 ◽  
pp. 283-288
Author(s):  
Kazuhito Ohashi ◽  
Yuya Takata ◽  
Shinya Tsukamoto
Keyword(s):  
Surface Cleaning ◽  
Hard Carbon ◽  
Adhesive Film ◽  
Abrasive Grains ◽  
Pressing Time ◽  
Treatment Processes ◽  
Grinding Performance ◽  
Dry Grinding ◽  
High Efficient ◽  
Wheel Loading

The grinding performance of wheel remarkably decreases by the wheel loading in dry grinding of precision hard carbon parts. When the wheel loading occurs, the dressing is carried out to remove loading chips for generation of the grinding performance. However, many abrasive grains, which have enough cutting ability under loading chips, are removed in dressing. We therefore have developed the wheel surface cleaning using adhesive films without dressing to remove loading carbon chips on wheel surfaces in our previous reports, and the cleaning could achieve the lean regeneration of grinding performance of fine grade diamond wheels. The removing ability of loading chips is improved by increasing the peeling speed of adhesive film, the pressing time of adhesive films or the number of pressing time. However the optimum cleaning condition has not been investigated. In this report, from the viewpoint of efficiency in the treatment, we therefore investigate the optimum rolling press process of adhesive film on loading disc wheel surfaces in dry grinding of carbon. The optimum treatment processes are experimentally made clear, analyzing SPa of cleaned wheel surfaces, which is one of surface roughness parameters having the correlation with the protrusion height of abrasive grains. Furthermore, the effect of the treatment on regeneration of grinding performance is experimentally verified by grinding tests of hard carbons.

Design and Fabrication of the Superabrasive Grinding Wheel with Phyllotactic Pattern

2012 ◽  
Vol 472-475 ◽  
pp. 2354-2360 ◽  
Author(s):  
Yu Shan Lu ◽  
Cheng Yi Zhao ◽  
Jun Wang ◽  
Yan He ◽  
Zhi Hui Kou
Keyword(s):  
Experimental Results ◽  
Grinding Wheel ◽  
Wheel Surface ◽  
Work Surface ◽  
Phyllotactic Pattern ◽  
Uv Lithography ◽  
Working Surface ◽  
Abrasive Grain ◽  
Grinding Performance ◽  
Cluster Pattern

In order to achieve the controllability of the abrasive arrangement on the working surface of grinding wheel,a new kind of the superabrasive grinding wheel, which has defined abrasive grain cluster pattern, has been designed based on the phyllotaxis theory of biology, and fabricated with UV lithography method and electroplating technology. The analytical results indicate that the phyllotactic parameters influence on the abrasive arrangement configuration on the work surface of the superabrasive grinding wheel, so as to improve grinding performance of the grinding wheel, increasing the diameter of phyllotactic abrasive grain cluster and decreasing phyllotactic coefficient can increases the abrasive grain density of the surperabrasive grinding wheel surface. Electroplating experimental results show that the reasonable electroplating processes can reduce the faults of defined abrasive arrangement on the superabrasive grinding wheel surface.

1017 The Proposal for Removal Method of Loading Chips on Wheel Surface in Dry Grinding of Carbon

2007 ◽  
Vol 2007.45 (0) ◽  
pp. 397-398
Author(s):  
Junnpei NISHIOKA ◽  
Kazuhito OHASHI ◽  
Shinya TSUKAMOTO ◽  
Hiroyuki HASEGAWA
Keyword(s):  
Wheel Surface ◽  
Removal Method ◽  
Dry Grinding

Abrasive Grain Efficiency and Surface Roughness in Machining Magnesium Alloys by Newly Developed Cup-Type Diamond-Grinding-Wheels

2009 ◽  
Vol 620-622 ◽  
pp. 769-772
Author(s):  
Tien Dong Nguyen ◽  
Koji Matsumaru ◽  
Masakazu Takatsu ◽  
Kozo Ishizaki
Keyword(s):  
Surface Roughness ◽  
Magnesium Alloys ◽  
Unit Length ◽  
Grinding Wheel ◽  
Light Metals ◽  
Grinding Wheels ◽  
Wheel Surface ◽  
Abrasive Grains ◽  
Diamond Grinding ◽  
Abrasive Grain

New cup-type diamond-grinding-wheels with hexagonal pattern have been developed. Grinding stone ratio, R is defined as the ratio between the hexagonal edge area containing abrasive grains and the total area of the wheel surface. In the present work, four kinds of hexagonal grinding wheels with different R (13 %, 19 %, 25 % and 36 %) and a conventional wheel (R: 100 %) were used to grind a light metals, which was represented by magnesium alloy AZ31B. Efficiency of abrasive grains and ground surface for machining a light metals were evaluated by calculating the number of abrasive grains which pass through a unit length of a sample surface for each grinding pass, Ng. The results show that surface roughness becomes smaller, i. e., smoother surfaces as Ng increases. Surfaces ground by the conventional wheel are rougher than those by using newly developed hexagonal grinding-wheels in spite of the larger Ng for the conventional wheel. Surface roughness data forms one curve in roughness vs. Ng graph for all hexagonal wheels, and forms another curve for the conventional grinding-wheel. The difference of two curves indicates that the number of effective working abrasive grains in hexagonal wheels is about 5 times higher than that of the conventional wheel. The similar results were obtained for machining sapphire according to our previous work. Hexagonal wheels show higher abrasive grain efficiency for machining not only hard-to-machine ceramics but also light metals such as magnesium alloys than conventional wheels.

scholarly journals THE EFFECT OF ABRASIVE GRAIN SHAPES ON QUALITY OF FERRITE MAGNETS GRINDING PROCESS

2020 ◽  
Vol 14 (2) ◽  
pp. 117-124
Author(s):  
Bayu Rahmat Saputro ◽  
Amin Suhadi
Keyword(s):  
Chemical Composition ◽  
Single Layer ◽  
Processing Parameters ◽  
Grinding Process ◽  
Model Design ◽  
Grinding Wheels ◽  
Abrasive Grains ◽  
Abrasive Grain ◽  
Shape And Size

Abstract A research was conducted on the grinding process of ferrite magnet with Strontium ferrite type (SrO.6 (Fe2O3)) using electroplated single layer grinding wheels. Many cracks have been found on work pieces during this work, which is coming from grinding processes. Research is conducted starting from chemical composition test and the effect of the shape and size of the abrasive grain of grinding wheels to the quality of grinding process results by measuring crack ratio of the work piece.  In this experiment, 3 (three) model design of grinding wheels with three different size and shape of abrasive grains are made. All of processing parameters are set at the same value as ordinary process.  The experimental results shown that 3rd model have the best results from the outputs number and also the lowest reject crack ratio compared to 1st and 2nd models. This is because the 3rd model has blocky shape which its distribution structure is denser and more uniform compared to the irregular shape, so that continuous grinding on hard and brittle work pieces is more stable and suitable

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