10-10-2018, 11:50 PM
To EOU:
This is a somewhat theoretical but based on research piece where he took a optimistic number of only 600°C as maximum temperatur on the cutting edge and calculated the resulting hardness over time with the formula on page 3.
But I forgot to mention that he and Roman landes further in the thread postet other research that shows diagrams of heat vs time while grinding and real world tests on knives with micro hardness measueres I wil link them below.
Micro Hardness of a Busse and Cold steel knive
https://www.messerforum.net/showthread.p...post378002
Older german research by Südemann where he drilled holes through a specimen and attacked a thermocouple directly to the grinding surface or just behind a thin layer Page 14 shows how it was done. And at page 17 is the graph of temperature while grinding at 19m/s while the part was ground for one second on a SIC grinding disc 320 grit. Further down the paper there are different speeds and grits in use plotted temperature against time with and without coolant.
https://www.messerforum.net/showthread.p...post378086
And lastly something linked by Roman again from 1909 where they researched sparks while grinding and found that the sparks get hot enough to melt.
https://www.messerforum.net/showthread.p...post378314
This is a somewhat theoretical but based on research piece where he took a optimistic number of only 600°C as maximum temperatur on the cutting edge and calculated the resulting hardness over time with the formula on page 3.
But I forgot to mention that he and Roman landes further in the thread postet other research that shows diagrams of heat vs time while grinding and real world tests on knives with micro hardness measueres I wil link them below.
Micro Hardness of a Busse and Cold steel knive
https://www.messerforum.net/showthread.p...post378002
Older german research by Südemann where he drilled holes through a specimen and attacked a thermocouple directly to the grinding surface or just behind a thin layer Page 14 shows how it was done. And at page 17 is the graph of temperature while grinding at 19m/s while the part was ground for one second on a SIC grinding disc 320 grit. Further down the paper there are different speeds and grits in use plotted temperature against time with and without coolant.
https://www.messerforum.net/showthread.p...post378086
And lastly something linked by Roman again from 1909 where they researched sparks while grinding and found that the sparks get hot enough to melt.
https://www.messerforum.net/showthread.p...post378314