Optimization of Cutting Edge Truncation Depth for Ultrasonically Assisted Grinding to Finish Mirror Surface

2009 ◽  
Vol 76-78 ◽  
pp. 88-93 ◽  
Author(s):  
Keisuke Hara ◽  
Hiromi Isobe ◽  
Akira Kyusojin
Keyword(s):  
Ground Surface ◽  
Optimization Techniques ◽  
Cutting Edge ◽  
Mirror Surface ◽  
Skilled Workers ◽  
Ultrasonic Oscillation ◽  
Oscillation Effect ◽  
Grinding Conditions ◽  
Grinding Technique ◽  
Face Grinding

High precision mold grinding technique to obtain mirror surface is required which realizes minimization or omission of final polishing by skilled workers. In the previous reports, ultrasonic diamond grinding experiments were carried out to confirm ultrasonic oscillation effect for die steel face grinding. Smooth and glossy surfaces were obtained successfully and little abrasive worn out was found. In the above techniques require cutting edge truncation because the cutting edge shape of a tool affects the ground surface resulting from transcription of cutting edge. This paper describes optimization techniques for the cutting edge truncation of diamond electroplated tools which are used in ultrasonically assisted grinding. Experiments were carried out to confirm truncation effects on the ground surface and grinding force. It was confirmed that roughness was proportional to inverse of thrust force. Minimum roughness in grinding conditions were estimated from the proportional diagrams. The minimum roughness shows limit of roughness on an each grinding condition.

Effects of Cutting Edge Truncation on Ultrasonically Assisted Grinding

2008 ◽  
Vol 389-390 ◽  
pp. 368-374 ◽  
Author(s):  
Keisuke Hara ◽  
Hiromi Isobe ◽  
Akira Kyusojin
Keyword(s):  
Ground Surface ◽  
Grinding Force ◽  
Cutting Edge ◽  
Mirror Surface ◽  
Skilled Workers ◽  
Oscillation Effect ◽  
Die Steel ◽  
Grinding Tool ◽  
Grinding Technique ◽  
Face Grinding

High precision mold grinding technique to obtain mirror surface is required which realizes minimization or omission of final polishing by skilled workers. In the previous reports, ultrasonically diamond grinding experiments were carried out to confirm ultrasonically oscillation effect for die steel face grinding. Mirror surface was obtained successfully and little abrasive worn out was found. In the above technique, the cutting edge shape of a tool affects the ground surface resulting from transcription of cutting edge. In other words, cutting edge truncation of grinding tool is required to be smooth and glossy surface. This paper describes the cutting edge truncation of diamond electroplated tools which are used in ultrasonically assisted grinding. Experiments were carried out to confirm truncation effects on the ground surface and grinding force. It was confirmed that cutting edge truncation is effective method to obtain mirror surface and excessive truncation causes large grinding force and chattering.

Effects of Cutting Edge Truncation on Ultrasonically Assisted Grinding

2011 ◽  
Vol 325 ◽  
pp. 97-102
Author(s):  
Keisuke Hara ◽  
Hiromi Isobe ◽  
Mohd Fauzi Ismail ◽  
Shoichi Kaihotsu
Keyword(s):  
Ground Surface ◽  
Cutting Edge ◽  
Surface Finishing ◽  
Mirror Surface ◽  
Skilled Workers ◽  
Surface Finishes ◽  
Molded Parts ◽  
Grinding Conditions ◽  
Injection Molded ◽  
Ground Surface Roughness

Dies for injection molded parts require high-quality surface finishes in terms of both appearance and integrity. Manual finishing by skilled workers is required to produce such surfaces, but this takes several days. To minimize the amount of polishing required, a new finishing technique that employs ultrasonically assisted diamond grinding was proposed in a previous report. Cutting edge truncation prior to grinding is required to produce a mirror surface. In this study, the effect of cutting edge truncation was investigated and the relationships between the ground surface roughness and the cutting torque and the thrust force were considered to optimize the grinding conditions for mirror surface finishing.

COMPARISON OF EXPERIMENTALLY MEASURED AND SIMULATED WORKPIECE AND GRINDING WHEEL TOPOGRAPHY USING A NEW DRESSING MODEL

2016 ◽  
Vol 40 (1) ◽  
pp. 1-17 ◽  
Author(s):  
Abdalslam Darafon ◽  
Andrew Warkentin ◽  
Robert Bauer
Keyword(s):  
Surface Finish ◽  
Metal Removal ◽  
Ground Surface ◽  
Cutting Edge ◽  
Edge Density ◽  
Grinding Wheel ◽  
Workpiece Surface ◽  
Wheel Topography ◽  
Grinding Wheel Topography ◽  
Grinding Conditions

This paper presents a new empirical model of the dressing process in grinding which is then incorporated into a 3D metal removal computer simulator to numerically predict the ground surface of a workpiece as well as the dressed surface of the grinding wheel. The proposed model superimposes a ductile cutting dressing model with a grain fracture model to numerically generate the resulting grinding wheel topography and workpiece surface. Grinding experiments were carried out using “fine”, “medium” and “coarse” dressing conditions to validate both the predicted wheel topography as well as the workpiece surface finish. For the grinding conditions used in this research, it was observed that the proposed dressing model is able to accurately predict the resulting workpiece surface finish for all dressing conditions tested. Furthermore, similar trends were observed between the predicted and experimentally-measured grinding wheel topographies when plotting the cutting edge density, average cutting edge width and average cutting edge spacing as a function of depth for all dressing conditions tested.

Study on Lubricating and Cooling Effects of Several Cooling Systems Used in Face Grinding

2005 ◽  
Vol 291-292 ◽  
pp. 221-226
Author(s):  
Takeshi Tanaka ◽  
T. Kobayashi
Keyword(s):  
Surface Roughness ◽  
Removal Rate ◽  
Ground Surface ◽  
Cooling Effect ◽  
Wet Grinding ◽  
Grinding Conditions ◽  
Cooling Effects ◽  
Stock Removal ◽  
Ground Surface Roughness ◽  
Face Grinding

We observed that the lubrication effect is greater than the cooling effect for decreasing the friction heat in face grinding. It was clarified that cool-air grinding is difficult to apply to face grinding under the present grinding conditions. We could obtain the minimum ground surface roughness (hereafter noted as surface roughness) at a mist suppｌy volume of 15 to 30ml/h in mist grinding. The largest stock removal rate (hereafter noted as grinding efficiency) is obtained in mist grinding. However, grinding efficient was small in cool-air mist grinding, by which a large cooling effect of cool air was expected. Though mist and cool-air mist grinding perform similar to wet grinding in few grinding passes, wet grinding is properly applied by large chip removal action in many grinding passes.

Ultra-High Speed Grinding Using a CBN Wheel for a Mirror-Like Surface Finish

2005 ◽  
Vol 291-292 ◽  
pp. 67-72 ◽  
Author(s):  
M. Ota ◽  
T. Nakayama ◽  
K. Takashima ◽  
H. Watanabe
Keyword(s):  
Surface Finish ◽  
High Speed ◽  
High Efficiency ◽  
Ground Surface ◽  
Machining Process ◽  
Grinding Wheel ◽  
Cbn Wheel ◽  
Ultra High Speed ◽  
High Speed Grinding ◽  
Grinding Conditions

There are strong demands for a machining process capable of reducing the surface roughness of sliding parts, such as auto parts and other components, with high efficiency. In this work, we attempted to grind hardened steel to a mirror-like surface finish with high efficiency using an ultra-high speed grinding process. In the present study, we examined the effects of the work speed and the grinding wheel grain size in an effort to optimize the grinding conditions for accomplishing mirror-like surface grinding with high efficiency. The results showed that increasing the work speed, while keeping grinding efficiency constant, was effective in reducing the work affected layer and that the grinding force of a #200 CBN wheel was lower than that of a #80 CBN wheel. Based on these results, a high-efficiency grinding step with optimized grinding conditions was selected that achieved excellent ground surface quality with a mirror-like finish.

scholarly journals A Roadmap to Gradually Compare and Benchmark Description Logic Calculi

10.29007/tgc4 ◽  
2019 ◽  
Author(s):  
Fred Freitas
Keyword(s):  
Asymptotic Analysis ◽  
Description Logic ◽  
Basic Research ◽  
Detailed Comparison ◽  
Optimization Techniques ◽  
Cutting Edge ◽  
Memory Usage ◽  
Inference Methods

DL reasoners were developed with cutting-edge performance, implementing plenty of specific optimization techniques over tableaux-based methods, which took over the field. However, promising methods may have been neglected in such a scenario, in which the tough competition is often focused on gains through optimizations. Therefore, perhaps there is still room available for “basic research” on DL reasoning. The purpose of this work is to stimulate research on trying out DL calculi other than tableaux. Such endeavors should be carried out by making a careful, detailed comparison between tableaux and other inference methods in a systematic way: first starting with simpler languages (like ALC) without any optimizations. Then gradually including optimizations and comparing them; and continuing these interactive steps: enhancing language expressivity, including optimizations, and testing until reaching the most expressive DL fragments such as SROIQ. The comparison can also be done by in terms memory usage and algorithm asymptotic analysis, with worst and average cases, etc. The rationale is identifying whether there are fragments which are more suitable to certain inference methods, as well as which aspects or constructs (e.g., the costliest combinations, which usually involve inverses, nominals, equalities, etc) are sensitive to which calculus.

Wheel Life and Cutting-Edge Wear in Mirror-Grinding Using a Coarse-Grained cBN Wheel Treated by Microdressing

2016 ◽  
Vol 10 (5) ◽  
pp. 753-758 ◽  
Author(s):  
Yoshio Ichida ◽  
Keyword(s):  
Wear Behavior ◽  
Mesh Size ◽  
Cutting Edge ◽  
Coarse Grained ◽  
Mirror Surface ◽  
Wheel Surface ◽  
Roll Steel ◽  
Cbn Wheel ◽  
Average Grain Size ◽  
Mirror Grinding

This paper presents the wheel life and wear behavior of the cutting edges of a coarse-grained, microdressed cubic boron nitride (cBN) wheel used in mirror-grinding of hardened roll-steel. Many grain-cutting edges with smooth, ductile-mode cut surfaces and numerous brittle-mode-fractured micro dents are formed on the wheel’s working surface after microdressing with a fine-grained diamond dresser. Cylindrical mirror-grinding experiments are conducted using a metal-bonded cBN wheel with a mesh size of #140 (Average grain sizeda=105 μm). A mirror surface with a roughness below 0.2 μmRzcan be efficiently formed with the wheel surface treated by the abovementioned microdressing method. This wheel surface can perform mirror-grinding with precision for more than nine hours. A flat plane formed via attritious wear of the cutting edge gradually extends with increasing accumulated stock removal, and simultaneously, the unevenness due to wear streaks on this flat plane increases. This increase in the unevenness of the worn flat plane is the main factor causing an increase in the roughness of the mirror surface.

On the Limit of Surface Integrity of Alumina by Ductile-Mode Grinding

1999 ◽  
Vol 122 (1) ◽  
pp. 129-134 ◽  
Author(s):  
I. Zarudi ◽  
L. C. Zhang
Keyword(s):  
Surface Integrity ◽  
Bulk Material ◽  
Material Surface ◽  
Grinding Wheel ◽  
Mirror Surface ◽  
Abrasive Grains ◽  
Pit Formation ◽  
Ductile Mode ◽  
Grinding Conditions ◽  
Radial Cracks

This paper investigates both experimentally and theoretically the subsurface damage in alumina by ductile-mode griding. It found that the distribution of the fractured area on a ground mirror surface, with the Rms roughness in the range from 30 nm to 90 nm, depends on not only the grinding conditions but also the pores in the bulk material. Surface pit formation is the result of interaction of abrasive grains of the grinding wheel with pores. Thus the surface quality achievable by ductile-mode grinding is limited by the initial microstructure of a material. The investigation shows that median and radial cracks do not appear and hence are not the cause of fracture as usually thought. [S0094-4289(00)02001-6]

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