Preventing fretting of metals
Preventing fretting of metals
(OP)
Is there anyone who has any knowledge of minimising fretting of metals. The problem is that our 300 tonne press has pins that fatigue which leads to the perf tool braking. The tool is made of 500/7 spheroidal cast iron, constinously cast and is induction hardened around the prefery of the tool to approx 40rc. The sheet material is 0.5 zintec or galvanised steel.
I would appreciate any info on the choice of tool metal or methods that would lead to a longer lifespan of the tool.
Thanks
I would appreciate any info on the choice of tool metal or methods that would lead to a longer lifespan of the tool.
Thanks





RE: Preventing fretting of metals
http://www.asm-intl.org/
RE: Preventing fretting of metals
Can you come back with a little more information?
Are the perforating pins fretting first?
If so what material are they made from?
Are the pins held by the CI block or is the CI block the die?
RE: Preventing fretting of metals
The build up of particles causes an uneveness and when the press drops again, it snaps the tool.
RE: Preventing fretting of metals
RE: Preventing fretting of metals
I would encourage not to use the term fretting without knowing the type of wear for sure. Fretting is due to vibratory motion of small amplitude. I do not know whether this is what happens in your die/punch situation.
Please describe the situation, materials (with treatment and propeties such as hradness)used, fracture / wear / corrosion pattern (just a note on damaged surface appearance), etc.
Where does the build up of particles occur? What kind of particles (e.g. sand)? Uneveness - in relations to what surface?
RE: Preventing fretting of metals