How to increase friction resistance on hardener stainless steel

[501560789]

Hi,

I have a basic question. I am not a metal specialist.

How to increase friction resistance on hardener stainless steel blade?

Smooth Blade (V profile blade) is shearing copper wire in constant cycle production.

TiNi coat will be good?

Thank you for all answers.
cbdu

 

[EdStainless]

What stainless steel grade are you using?
Any reason not to switch to a tool steel? You might have lower corrosion resistance (or maybe not) and with the correct grade you could get longer life.

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Plymouth Tube

 

[arunmrao]

Why stainless steels. Simple high carbon steels will be adequate for copper. Though tool steel can be a better option.

 

[501560789]

I think its tool steel. I dont the grade.

How to increase friction/wear resistance on hardener tool steel shear blade? Coat TiNi or smth else?

Thank you for support.

 

[501560789]

Guys,

I'd like to ask you for support to chose best process.

Action:
Cut-off (hardener tool steel,tested 64HRC) blades cutting copper wire OD=2mm during serial production. V profile blades shearing this wire and after 15k cycles new blade edge is dulled/blunted.

Which process will be the best for increase of wear resistance?and why.

I think about: 1st - TiCN coat t=3mikron or
2nd - ion nitriding or 3rd - burnishing.

Thanks a lot.

 

[IRstuff]

Is dullness only due to friction on the sides? What experiment evidence do you have for wanting reduced friction?

TTFN

FAQ731-376

 

[501560789]

The friction seems to be only reason because after visual inspection its clear there is no edge cracks, creep etc. Only dulled blade edges.
I would like to improve the friction resistance by some metallury process and I am not sure which.

Which process in this case should be in the scope?

 

[racookpe1978]

15,000 cycles.

Seems that the expense of retreating and specially fabricating the stainless steel blade gretaly exceeds the much lower cost of simply getting a hardened tool steel blade, getting more cycles because of the heardness (20,000 to 25,000 maybe) and still not getting corrosion problems over the short extension to life.

Then get a new, cheaper blade. Repeat.

 

[IRstuff]

If the edge is dull, it may simply be because your blade is too SOFT. Friction on the side would have no bearing on the edge, unless you got the blade so hot it's starting to melt.

TTFN

FAQ731-376

 

[501560789]

Hardness of material tool steel blade is 64 HRC.
First I will try with coat TiCNi coat at 400 deg C increase to above 95 HRC increasing wear resistance.

What about ion nitriding or burnishing ? Do you think can help and why?

thank you.