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Surface Hardness & Depth Calculation

Surface Hardness & Depth Calculation

Surface Hardness & Depth Calculation

(OP)

What is the process to determine how hard a components surface should be, but more importantly how do you determine how deep the the hardness should travel?

Thanks

RE: Surface Hardness & Depth Calculation

do a google search "case hardness measurement" and "case depth".

I have not failed. I've just found 10,000 ways that won't work." — Thomas Edison
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RE: Surface Hardness & Depth Calculation

A sample with a perpenicular cut to the case surface is done, polished and a micro hardeness test is done from the surface toward the inside of the part. The case thickness is the depth from the surface to the depth where the hardness id equall 50RC.

RE: Surface Hardness & Depth Calculation

Selecting hardness values for a part usually is trial-and-error and experiential rather than done from first principles.  Some common surface hardness values are 60 HRC for gear teeth, 50 HRC to 60 HRC for splines, 50 HRC for journal bearings and seal surfaces.  Fatigue strength is the driver for hardness depth.  Typical values are ~ 1 mm to 50 HRC for gears, and depth to 45 HRC of ~ 5 mm for shafts.

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