I have a customer which we manufacture springs that get shotpeened and the customer is having issues with the shot media getting wedged in between the last active coil and closed coil. The spring is used in a hydraulic pump and they do not what any foreign material that could cavitate the pump. Does anyone know of a different shotpeening method that doesn’t use shot media?
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Alternative to Shotpeening
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btrueblood
Mechanical
I'd think any blasting media has the chance to leave residue behind, and residue in a hydraulic pump is a guarantee of failure. A better question might be "how to best clean these springs", and I'd be looking at ways to gently wedge open the final turn to ensure that area gets as well cleaned as the rest of the spring.
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Thanks for the info guys. Currently we are cleaning it exactly
like as btrueblood stated. Customer likes this method but does not want to pay for it. I would like to try to redesign the springs so they would not need to be shotpeened, this maybe the easier route.
like as btrueblood stated. Customer likes this method but does not want to pay for it. I would like to try to redesign the springs so they would not need to be shotpeened, this maybe the easier route.
btrueblood
Mechanical
"I would like to try to redesign the springs so they would not need to be shotpeened"
Well, probably not acceptable to the customer, as the fatigue life would suffer.
But how about redesigning the spring so that the last turn is not "fully closed", i.e. doesn't rest against the next turn? If the spring is guided in its travel, it is unlikely that the fully closed condition is a design requirement.
Well, probably not acceptable to the customer, as the fatigue life would suffer.
But how about redesigning the spring so that the last turn is not "fully closed", i.e. doesn't rest against the next turn? If the spring is guided in its travel, it is unlikely that the fully closed condition is a design requirement.
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Aside from the above recommendations I believe you have two other approaches to resolving your problem. First would be to look at changing shot size. The second would be to slightly stretch the spring while peeing with fixturing.
Here is paper with a little information on shot size.
Here is paper with a little information on shot size.
A play on my post concerning shot size.
You might want to check out the Badger Metal site. They use fine penning or nitriding or combination of the two to improve tool life.
You might want to check out the Badger Metal site. They use fine penning or nitriding or combination of the two to improve tool life.
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Can you give more detailed information of the spring:
Dimentions
First load point
Second load point
Number of active and total coils
Type of ends
Material specifications
Did you check wire surface conditions after coiling (Nicks, Scratches, Dents, Tool markings, etc.?
Dimentions
First load point
Second load point
Number of active and total coils
Type of ends
Material specifications
Did you check wire surface conditions after coiling (Nicks, Scratches, Dents, Tool markings, etc.?
Info on laser peening:
You might also want to search the library at ShotPeener.com.
I looked into laser peening as an alternative to shot peening, but the cost was day and night compared to shot peening.
You might also want to search the library at ShotPeener.com.
I looked into laser peening as an alternative to shot peening, but the cost was day and night compared to shot peening.
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