Comparison of Static and Dynamic Hardness of Grinding Wheels

1964 ◽  
Vol 86 (3) ◽  
pp. 294-297 ◽  
Author(s):  
J. Peklenik ◽  
R. Lane ◽  
M. C. Shaw
Keyword(s):  
Grain Size ◽  
Statistical Analysis ◽  
The Other ◽  
Surface Grinding ◽  
Complete Picture ◽  
Grinding Wheel ◽  
Grinding Wheels ◽  
Dynamic Hardness ◽  
New Methods ◽  
Different Grain Size

The values obtained by two new methods of measuring grinding-wheel hardness are critically compared for a variety of surface grinding wheels of different grain size and vitreous bond content. The two methods are found to agree quite well in their ability to distinguish wheels of different commercial hardness. One method is dynamic, easily applied in the workshop, somewhat more complex to analyze. The other method is quasi-static, and capable of yielding a more complete picture in research studies of grinding-wheel hardness through statistical analysis of the results obtained. It would appear that both methods represent a distinct step forward in grinding-wheel technology and that each is of value in its own sphere of application.

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

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.

Development of a New Truing Device Based on Electro-Contact Discharge Machining for Metal Bond Grinding Wheels

2016 ◽  
Vol 874 ◽  
pp. 268-271 ◽  
Author(s):  
Masahiro Mizuno ◽  
Akira Karibe ◽  
Nobuhito Yoshihara ◽  
Naohiro Nishikawa ◽  
Toshiro Iyama
Keyword(s):  
Grain Size ◽  
Diamond Wheel ◽  
The Other ◽  
Grinding Wheels ◽  
Metal Bond ◽  
Working Face ◽  
Grinding Conditions ◽  
Dry Conditions ◽  
Contact Discharge ◽  
Shape And Size

Metal bond grinding wheels can retain their shape and size under extreme grinding conditions. On the other hand, it is difficult to true them accurately and efficiently due to the severe wear of truing tools. To solve the problem, this paper proposes a new truing device based on electro-contact discharge machining. The device is designed so that the position of the electrode working face remains unchanged even if the electrode is worn. Some truing experiments were carried out using a prototype truing device for a metal bond diamond wheel of grain size #1000 under dry conditions. As a result, relatively high truing accuracy has been achieved in combination with an additional truing by a GC stone.

Studies of Electrodischarge and Electrochemical System for Dressing of Metal Bond Grinding Wheels

2006 ◽  
Vol 220 (3) ◽  
pp. 413-420 ◽  
Author(s):  
A Gołabczak ◽  
J Kozak
Keyword(s):  
Mathematical Modelling ◽  
Hybrid System ◽  
Experimental Results ◽  
Surface Grinding ◽  
Grinding Wheel ◽  
Tool Electrode ◽  
Electrochemical System ◽  
Grinding Wheels ◽  
Metal Bond ◽  
Cutting Surface

In this paper the development of an effective hybrid electrodischarge and electrochemical profiling/dressing system is depicted. To realize the profiling of superhard grinding wheels, an innovative segmental tool electrode has been designed and tested. The principle of operating this system, the case for its realization, mathematical modelling, and experimental results concerning dressing of grinding wheels is discussed. The results of the investigation demonstrate the usefulness of a hybrid system for the profiling of superhard grinding wheels and the shaping macro- and micro-geometry of the cutting surface grinding wheel (CSGW).

On Determining the Hardness of Grinding Wheels—II

1963 ◽  
Vol 85 (1) ◽  
pp. 27-32 ◽  
Author(s):  
L. V. Colwell
Keyword(s):  
Substantial Reduction ◽  
Progress Report ◽  
The Other ◽  
Grinding Wheel ◽  
Appreciable Effect ◽  
Force Measurements ◽  
Grinding Wheels ◽  
Single Pass ◽  
Preliminary Results ◽  
Other Hand

This second progress report on the crush grading of grinding wheels by means of force measurements takes up the question of the effect of variations in system rigidity on hardness ratings. Preliminary results with the consecutive infeed or single-pass procedure show no appreciable effect with a substantial reduction in rigidity. On the other hand, the two-pass or alternate infeed procedure is shown to be sensitive to system rigidity. This characteristic complicates the problem of devising a procedure for deriving a dimensionless hardness number. On the other hand, it offers a mechanism for isolating the effective rigidity of the grinding wheel itself.

Optimizing the Grinding Process through Reduction of the Loading of Grinding Tool by Infiltration

2016 ◽  
Vol 1136 ◽  
pp. 71-77
Author(s):  
Bahman Azarhoushang ◽  
Rolf Rinderknecht ◽  
Alireza Vesali ◽  
Juergen Struss
Keyword(s):  
Surface Quality ◽  
Automobile Industry ◽  
Surface Grinding ◽  
Process Efficiency ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Grinding Wheels ◽  
Workpiece Material ◽  
Wide Range ◽  
Grinding Tool

The loading of the grinding wheel and adhesion of the workpiece material to the cutting edges of the grinding tool are among the main reasons which limit the process efficiency when grinding ductile materials. The micro topography of the grinding tool changes drastically as a result of loading. Higher grinding forces and temperatures, poorer surface quality and process accuracy are the consequences of the adhesion of the workpiece material to the grinding tool surface. A novel and promising technique to reduce the possibility of loading and adhesion in the grinding process is the infiltrating of the grinding tool. This study describes the results of infiltration of vitrified bonded conventional grinding wheels with graphite in the surface grinding process. The effects of infiltration have been studied for the first time on various grinding wheels with different grain materials, grit sizes, porosity and hardness. Two different types of steel which are very popular in the automobile industry, 100Cr6 and 16MnCr5, were chosen as the workpiece material by the surface grinding experiments. The selected cutting parameters cover a wide range of the practical surface grinding processes which are utilized generally in the industry. It has been experimentally shown that the type of infiltration plays an important role in reducing the loading of the wheel. Better surface quality and longer dressing intervals are the main results of the infiltration of the grinding tools.

The Role of Grain Size on Deformation of 316H Austenitic Stainless Steel

2012 ◽  
Vol 525-526 ◽  
pp. 201-204
Author(s):  
S. Mahalingam ◽  
Peter E.J. Flewitt ◽  
A. Shterenlikht
Keyword(s):  
Grain Size ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Strain Rate ◽  
High Purity ◽  
Constant Strain Rate ◽  
The Other ◽  
Point Bend ◽  
Different Grain Size

The polycrystalline high purity 316H austenitic stainless steel has been thermo-mechanically treated to produce material with two layers of grain size, one of coarser and the other of finer grains. Small three point bend specimens containing a notch positioned in either the coarser or finer layer have been tested at a constant strain rate and a temperature of -196°C. The results are discussed with respect to the effect of grain size on the underlying deformation between the two layers of different grain size.

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