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.

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.

Influence of a Grinding Atmosphere in the Combination Grinding of Steel and WC with a Diamond Wheel

2013 ◽  
Vol 797 ◽  
pp. 90-95
Author(s):  
Shinichi Ninomiya ◽  
Manabu Iwai ◽  
Kiyoshi Suzuki
Keyword(s):  
Oxygen Concentration ◽  
Gas Injection ◽  
Diamond Wheel ◽  
Grinding Force ◽  
Experimental Results ◽  
Surface Grinding ◽  
Inert Gas ◽  
Dry Ice ◽  
Ice Particles ◽  
Grinding Performance

Grinding experiments were carried out in wet, with MQL, in dry, with a spray of dry ice particles and various gases to examine influence of grinding atmospheres on the grinding performance in the combination surface grinding of steel and WC with a diamond wheel. From the experimental results, it was found that the grinding with inert gas injection which reduces an oxygen concentration at the grinding point would proceed a processing at more stable grinding force, resulting in less wear of the diamond abrasives.

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

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.

Antecedents And Outcomes Of Qwl Among Employees In Banks

2019 ◽  
Vol 118 (7) ◽  
pp. 1-19
Author(s):  
Geethanjali N ◽  
Parveen Roja M ◽  
Lavanya D
Keyword(s):  
Organizational Climate ◽  
Job Stress ◽  
Work Life ◽  
Working Environment ◽  
Quality Of Work Life ◽  
Quality Of Work ◽  
Significant Difference ◽  
Service Productivity ◽  
The Impact

Quality of work life is the major factor to be considered in working environment of any organization. The performance of employees and the organization lies on the ability of the employees based on working environment. The QWL leads to better working environment which improves the performance of organization. The present study has made an attempt to find the level of factors causing QWL and the impact of outcome of QWL in banks. Since the profile of the banks may be associated with the level of outcomes of QWL, the present study has made an attempt to examine it with the help of one way analysis of variance and t-test. The included outcomes of QWL are job satisfaction, job stress, organizational climate, organizational commitment, employees retention behaviour, service quality employees and service productivity of employees. The highly associated determinants of QWL and the significant difference among the PUSBs and PRSBs have been noticed. The significantly associating important profiles of the banks regarding the existence of outcome of QWL are identified.

Assessment of the impact of factors of the working environment on the health of workers in oil refining based on the analysis of morbidity

2020 ◽  
pp. 600-600 ◽  
Author(s):  
I. V. Ginko ◽  
T. M. Sushinskaya ◽  
A. L. Rybina
Keyword(s):  
Comparison Group ◽  
Main Group ◽  
Working Environment ◽  
Oil Refinery ◽  
Oil Refining ◽  
Production Environment ◽  
The Impact

Studies have been conducted to assess the impact of factors of the production environment on employees of the oil refinery ofJSC «Naftan». Significant differences with the comparison group on the indicators of SVT were revealed. Priority nosological forms of employees of the main group are identified.

New areas of research in occupational medicine

2020 ◽  
pp. 811-811
Author(s):  
E. E. Shigan
Keyword(s):  
Occupational Medicine ◽  
Working Environment ◽  
Medium Businesses ◽  
The Impact

The study of the preservation of worker's health in recent years is gaining more and more new areas of research, among which like to point out the problems of harmonization of age and work, the impact of unemployment on health and aspects of the impact of the working environment of small and medium businesses on health.

scholarly journals Is the perceived impact of disciplinary procedures on medical doctors’ professional practice associated with working in an open culture and feeling supported? A questionnaire among medical doctors in the Netherlands who have been disciplined

BMJ Open ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. e036922
Author(s):  
Berber S Laarman ◽  
Renée J R Bouwman ◽  
Anke J E de Veer ◽  
Roland D Friele
Keyword(s):  
Professional Practice ◽  
Negative Impact ◽  
Working Environment ◽  
Perceived Support ◽  
Medical Doctors ◽  
Safe Environment ◽  
Item Questionnaire ◽  
Disciplinary Procedures ◽  
Perceived Impact ◽  
The Impact

IntroductionDisciplinary procedures can have a negative impact on the professional functioning of medical doctors. In this questionnaire study, doctors’ experience with open culture and support during a disciplinary procedure is studied to determine whether open culture and support are associated with perceived changes in the professional practice of doctors.MethodsAll doctors who received a warning or a reprimand from the Dutch Medical Disciplinary Board between July 2012 and August 2016 were invited to fill in a 60-item questionnaire concerning open culture, perceived support during the disciplinary procedure and the impact of the procedure on professional functioning as reported by doctors themselves. The response rate was 43% (n=294).ResultsA majority of doctors perceive their work environment as a safe environment in which to talk about and report incidents (71.2% agreed). Respondents felt supported by a lawyer or legal representative and colleagues (92.8% and 89.2%, respectively). The disciplinary procedure had effects on professional practice. Legal support and support from a professional confidant and a professional association were associated with fewer perceived changes to professional practice.ConclusionOur study shows that doctors who had been disciplined perceive their working environment as open. Doctors felt supported by lawyers and/or legal representatives and colleagues. Legal support was associated with less of a perceived impact on doctors’ professional practice.

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