CBN grinding wheels are increasingly used on a wide range of engineering materials. This paper compares the grinding performance of monocrystalline (M-CBN) and polycrystalline (P-CBN) abrasives with a newly developed nanocrystalline (N-CBN) abrasive, when grinding nickel-based superalloys. The N-CBN grits possess average crystal grain diameters less than 1 μm compared to average primary grain diameters of 2.3 μm for P-CBN. It was found that the nanocrystalline CBN grits possess higher fracture strength which give reduced wear rates and yield an order of magnitude increase in grinding wheel life. Analysis of the cutting edge distribution shows that the reduced wear rate of N-CBN is due to the predominance of a micro-fracturing mode of abrasive wear. The size of this micro-fracturing is considerably smaller in N-CBN than in P-CBN.

Issue Section:
Research Papers
Topics:
Grinding, Superalloys, Wear, Fracture (Process), Grinding wheels, Abrasives, Crystals, Cutting, Fracture toughness, Nickel
1.
Carius, A. C., 1984, “Preliminaries to Success—Preparation of Grinding Wheels Containing CBN,” International Grinding Conference, SME paper No. MR84–547.
2.
Ichida, Y., 1982, “Study on the Grinding Process with CBN Wheels,” Doctor of Engineering Thesis, Osaka University, Japan.
3.
Ichida, Y., Kishi, K., and Suyama, Y., 1988, “Study on the Behaviour of Cutting Edges in CBN Grinding,” Proceedings of the Spring Conference of the Japan Society of Precision Engineering, March, pp. 181–182.
4.
Ichida
Y.
,
Kishi
K.
,
Suyama
Y.
, and
Okubo
J.
,
1989
, “
Study on Creep Feed Grinding with CBN Wheels—Characteristics of Wheel Wear
,”
Journal of the Japan Society of Precision Engineering
, Vol.
55
, No.
8
, pp.
138
–
144
.
5.
Kishi, K., and Ichida, Y., 1980, “Grindability of High Carbon High Vanadium Steel with CBN Grinding Wheels,” Proceedings of the 4th International Conference on Production Engineering, Tokyo, pp. 679–684.
6.
Kovach
J. A.
, and
Malkin
S.
,
1988
, “
Thermally Induced Grinding Damage in Superalloy Materials
,”
Annals of the CIRP
, Vol.
37
, No.
1
, pp.
309
–
312
.
7.
Kumar, K. V., Koskey, J., and Ishikawa, T., 1991, “Superabrasive Grinding of Superalloys,” Superabrasives ’91, June, Chicago, MR91-216, pp. 17/17–17/30.
8.
Kumar, K. V., 1992, “Superabrasive Grinding of Speciality Materials such as Superalloys, Titanium Alloys and Intermetallic Alloys,” 1992, Proceedings of 3rd International Conference on High Technology, Chiba, pp. 31–45.
9.
Malkin
S.
, and
Cook
N. H.
,
1971
, “
The Wear of Grinding Wheels, Part 1— Attrition Wear
,”
ASME JOURNAL OF ENGINEERING FOR INDUSTRY
, Vol.
93
, pp.
1120
–
1128
.
10.
Lindsay, R. P., 1974, “Characteristics of Precision Production Grinding with Borazon (CBN) Wheels,” Proceedings of the Second North American Metal-working Research Conference, pp. 610–616.
11.
Malkin
S.
,
1985
, “
Current Trends in CBN Grinding Technology
,”
Annals of the CIRP
, Vol.
34
, No.
2
, pp.
557
–
563
.
12.
Percherer
E.
, and
Malkin
S.
,
1984
, “
Grinding of Steels with Cubic Boron Nitride
,”
Annals of the CIRP
, Vol.
31
, No.
1
, pp.
211
–
214
.
13.
Tawakoli, T., and Tavakkoli, S. J., 1991, “High Efficiency Deep Grinding (HEDG) of Inconel and Other Materials,” Superabrasives ’91, June, Chicago, MR91-163, pp. 4/67–4/82.
14.
To¨nshoff, H. K., and Grabner, T., 1984, “Cylindrical and Profile Grinding with Boron Nitride Wheels,” Proceedings of the 5th International Conference on Production Engineering, Tokyo, pp. 326–333.
15.
Yoshikawa
H.
, and
Sata
T.
,
1960
, “
Fracture Strength of Abrasive Grains
,”
Journal of the Japan Society of Precision Engineering
, Vol.
26
, No.
8
, pp.
476
–
481
.
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