Research Papers

Precision Grindability of Granite in Relation to Discrete Distribution Parameters of Microhardness and Microbrittleness

[+] Author and Article Information
J. Xie

School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, Chinajinxie@scut.edu.cn

J. Manuf. Sci. Eng 132(4), 041007 (Jul 22, 2010) (7 pages) doi:10.1115/1.4001578 History: Received January 28, 2009; Revised April 08, 2010; Published July 22, 2010; Online July 22, 2010

The natural granite includes various hard and brittle minerals with different material behaviors. In this paper, the discrete distribution parameters of microhardness and microbrittleness are proposed to describe its micron-scale material behavior. The objective is to evaluate and predict the precision grindability of various granites by using its microhardness and microbrittleness. First, the relative values of microhardness and microbrittleness were defined by measuring diagonal length and crack spreading length of micron-scale indentation in a micro-indentation experiment; then the microhardness, the microbrittleness, and their average deviations were introduced as discrete distribution parameters with regard to the weighted coefficients of various minerals in granite; finally, a precision grinding experiment was carried out to investigate the grinding force and surface roughness with regard to different grinding variables. It is found that grinding force and surface roughness have good and very good correlations with the microhardness and its average deviation, respectively, but they have no obvious relations with the microbrittleness. The ground surface can be improved when grinding the granite with high microhardness and its uniform distribution even if leading to large grinding force. For grinding variables, the grinding force increases with the decrease in the depth of cut and the work speed in brittle-mode grinding, but it has little correlation with work speed when approaching ductile-mode grinding. It is concluded that the precision grindability of granite may be evaluated and predicated by the relative microhardness and its average deviation.

Copyright © 2010 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Figure 5

Grinding force Fn versus microhardness H and its average deviation DH: (a) a=1 μm, (b) a=2 μm, (c) a=3 μm, (d) a=4 μm, and (e) a=5 μm

Grahic Jump Location
Figure 4

Distributions of microhardness and microbrittleness in granite: (a) microhardness and (b) microbrittleness

Grahic Jump Location
Figure 3

Measured microhardness versus measured microbrittleness in granite

Grahic Jump Location
Figure 2

Micro-indentation characteristics of various minerals in granite: (a) quartz, (b) orthoclase, (c) plagioclase, (d) pyroxene, (e) hornblende, and (f) mica

Grahic Jump Location
Figure 1

Image processing of mineral percentage in granite

Grahic Jump Location
Figure 6

Grinding force Fn versus microbrittleness C and its average deviation DC: (a) a=1 μm, (b) a=2 μm, (c) a=3 μm, (d) a=4 μm, and (e) a=5 μm

Grahic Jump Location
Figure 7

Surface roughness Ra versus microhardness H and its average deviation DH: (a) vf=0.5 m/min, (b) vf=0.75 m/min, and (c) vf=1.5 m/min

Grahic Jump Location
Figure 8

Surface roughness Ra versus microbrittleness C and its average deviation DC: (a) vf=0.5 m/min, (b) vf=0.75 m/min, and (c) vf=1.5 m/min



Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In