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Research Papers

Computer Numerical Control Grinding Wheel Pose for Thinned/Notched Drill Points With Specifiable Secondary Cutting Edge and Characteristic Angles

[+] Author and Article Information
Psang Dain Lin

Professor
Department of Mechanical Engineering,
National Cheng Kung University,
Tainan 70101, Taiwan
e-mail: pdlin@mail.ncku.edu.tw

1Corresponding author.

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received July 12, 2011; final manuscript received April 7, 2014; published online May 21, 2014. Assoc. Editor: Burak Ozdoganlar.

J. Manuf. Sci. Eng 136(4), 041002 (May 21, 2014) (8 pages) Paper No: MANU-11-1246; doi: 10.1115/1.4027414 History: Received July 12, 2011; Revised April 07, 2014

Researchers commonly develop notched drill points with secondary cutting edges that have unusual specifications; however, mathematical models cannot comprehensively specify these thinned/notched drill points. In an earlier work (Lin, P. D., and Tzeng, C. S., 2007, “New Method for Determination of the Pose of the Grinding Wheel for Thinning Drill Points,” Int. J. Mach. Tools Manuf., 47(15), pp. 2218–2229), precise mathematical modeling for drill design and one-wheel grinding of ISO-standard drills with linear secondary cutting edges was presented. That model is expanded herein to drill points with a specifiable secondary cutting edge and characteristic angle distribution. Optionally, the entire cutting edge (primary, secondary, and chisel edges) can be provided with C1 continuity to eliminate stress concentration points. The mathematical background and modeling are summarized in this study. Experimental drills are produced and tested for verification and demonstration. The presented modeling technique allows subsequent researchers to exactly duplicate the drills, including the thinning/notching drill points, a capability that was previously unavailable. This system is useful for improved drill CAD and CNC software for the design, manufacture, reconditioning, and research of novel point design.

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References

Figures

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Fig. 1

The generating curve of a grinding wheel

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Fig. 2

Nomenclature of a thinned drill

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Fig. 5

The thinned drill (#3) with straight secondary cutting edge by generation method. (a) Top-view and side-view. (b) The distribution of characteristic angle along secondary cutting edge.

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Fig. 6

The thinned drill (No. 4) with curved secondary cutting edge by generation method: (a) top-view and side-view and (b) the distribution of characteristic angle along secondary cutting edge

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