best mat'l for impact resistant washer
best mat'l for impact resistant washer
(OP)
I have an application where I need to make a custom plastic washer (10000 units) that would resist repetitive impact from a solenoid shaft shoulder for 2M cycles +. The temp of operation is -25 deg C to +70 deg. C
1/32 thick, 1" dia. Right now, a basic Delrin washer is colapsing and then cracking prematurely (500 000 cycles).
I was looking for UHMW, Nylatron, Polycarbonate? or other sugestions?
thanks
pp
1/32 thick, 1" dia. Right now, a basic Delrin washer is colapsing and then cracking prematurely (500 000 cycles).
I was looking for UHMW, Nylatron, Polycarbonate? or other sugestions?
thanks
pp






RE: best mat'l for impact resistant washer
UHMWPE will be more prone to pounding out than the Acetal was.
PC has poor fatigue resistance and poor resistance to many common solvents.
Regards
eng-tips, by professional engineers for professional engineers
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RE: best mat'l for impact resistant washer
has anybody had experiance with Hydlar (kevlar reinforced nylon). This stuff should be able to withstand impact and shocks? I think polyurethane would be too soft...
RE: best mat'l for impact resistant washer
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: best mat'l for impact resistant washer
Many years ago we made washers which were used to buffer the air driven slider in a pneumatic road drill (jackhammer in US?) along with handle isolation mounts.
They were made of a polyester elastomer - hard grade - made by DuPont called Hytrel (there are others, such as Arnitel, by DSM, etc)
The reliability engineers at the company were amazed how it outlasted the polyurethane they were currently using. In excess of 5m cycles if I recall correctly - certainly into 6 figures. The material in the harder grades is also very 'dead' and is used in vibration absorbing applications as well, making things quieter.
If you contact the material manufacturers you might get a sample big enough to punch yourself a sample washer out to try.
Rgds
Harry