Shelby Harvey, LCSW - shelby harvey

2024-10-04 06:20:50

CCGW style CBN coated multi-edge inserts designed for machining high hardened steels. Regrindable inserts available for extended tool life over standard carbide inserts.

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TNGA style CBN coated multi-edge inserts designed for machining high hardened steels. Regrindable inserts available for extended tool life over standard carbide inserts.

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CNC lathe inserts

I know this is an old question but I figured, since there's some confusion, I'd share a direct quote from "Machinery's Handbook" 30th edition, by Erik Oberg, Franklin D. Jones, Holbrook L. Horton, and Henry H. Ryffel. 2016 Industrial Press.

TCGW style CBN coated multi-edge inserts designed fror machining high hardened steels. Regrindable inserts available for extended tool life over standard carbide inserts.

I've run across a term in some grinding manufacturing research papers called the specific material removal rate. The units given for this term are [mm$^3$/mm$\cdot$s] (I don't really like this style of formatting because it makes it unclear as to whether the [s] is in the numerator or denominator, but that is the style that has been used in all of the papers that I have seen with this term). I am familiar with the general machining term material removal rate (or $MRR$), which is the volume of material removed per second from a workpiece in [mm$^3$/s], but what is the "specific" part of the "specific material removal rate"?

DCGW style CBN coated multi-edge inserts designed fror machining high hardened steels. Regrindable inserts available for extended tool life over standard carbide inserts.

SCGW style CBN coated multi-edge inserts designed fror machining high hardened steels. Regrindable inserts available for extended tool life over standard carbide inserts.

VCGW style CBN coated multi-edge inserts designed fror machining high hardened steels. Regrindable inserts available for extended tool life over standard carbide inserts.

DNGA style CBN coated multi-edge inserts designed fror machining high hardened steels. Regrindable inserts available for extended tool life over standard carbide inserts.

VBGW style CBN coated multi-edge inserts designed fror machining high hardened steels. Regrindable inserts available for extended tool life over standard carbide inserts.

Haas engraving Tool

TCGW style CBN coated multi-edge inserts designed fror machining high hardened steels. Regrindable inserts available for extended tool life over standard carbide inserts.

CNGA style CBN coated multi-edge inserts designed fror machining high hardened steels. Regrindable inserts available for extended tool life over standard carbide inserts.

Usually in machining when we say "specific" we're talking about per unit volume removed. So the specific energy of machining is normally expressed as unit energy per unit volume removed (e.g. [J/mm$^3$]). But for the specific $MRR$ it is a volume per second per unit length (after all, it wouldn't make any sense to have volume removed per unit volume removed). So I guess the real question is, what is this length that we are dividing the $MRR$ by to get the specific $MRR$? Why is this term useful?

Haas Inserts

CCGW style CBN coated multi-edge inserts designed for machining high hardened steels. Regrindable inserts available for extended tool life over standard carbide inserts.

VNGA style CBN coated multi-edge inserts designed fror machining high hardened steels. Regrindable inserts available for extended tool life over standard carbide inserts.

SNGA style CBN coated multi-edge inserts designed fror machining high hardened steels. Regrindable inserts available for extended tool life over standard carbide inserts.

"Specific Metal Removal Rate, or SMRR, represents the rate of material removal per unit of wheel contact width and are commonly recommended from: 200 to 500 mm3/mm width/minute (0.3 to 0.75 in3/inch width/minute)."

This seems like a pretty basic question, but I have been unable to find a definition for the specific material removal rate anywhere. I've looked at several papers and from context in the papers it is rather unclear. I've checked my textbook, Fundamentals of Modern Manufacturing 5th Ed. by Mikell P. Groover, no answer there. It may be a term that is specific to grinding operations.