By Wheels I. Marinescu, et al
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Extra info for Cap. 07-11 Handbook of Machining with Grinding
6 TRUER DESIGN FOR TOUCH DRESSING Attention must also be paid to the diamond truer design. As CBN is so much harder than conventional abrasive, the truer will wear much more per dress. This makes profiling truers with precisely lapped geometries uneconomic for most applications. Certainly for all flat form dressing applications, a truer with a consumable diamond layer is required. 7 IMPREGNATED TRUERS An obvious solution, based on conventional wheel experience, would be to use an impregnated truer.
23 Effect of crush ratio on normal grinding forces. 24 Acoustic sensor dressing strategy. (After Dittel 1996. ) will be reduced, whereas if too much is removed, the surface returns to that of a new wheel. In general, a balance has to be struck dependent on the particular grinding process in question. What is clear is that not only is the dress depth of cut per pass important governed by the fracture characteristics of the abrasive, but the total depth of cut is also critical governed by the active surface roughness.
The primary applications for this process are in the aerospace industry using relatively porous wheels <6 wide, and in the fuel injection and bearing industries using narrow (<1) wide wheels. In both cases, the limitations are in the machine and spindle stiffnesses. 6 DRESS PARAMETERS FOR FORM CBN WHEELS Hitchiner [1998, 1999] gives typical parameters for dressing of CBN wheels for grinding aircraft blades and vanes. 20 µm/rev, which are 10 times less than for conventional wheels. 1 s. 35 s, while for older, weaker grinders a dwell time of up to 2 s has been necessary to generate a round wheel.