Pin wear from period loading needs a permanent solution 1

[Imposter666]

There is a maintenance inspection at this pin once a month. it is usually changed out right away as failure would be catastrophic for the production. I have summarized all the details in the picture below. Increasing pin diameter would definitely help as the contact area would increase. However, I don't think this would solve the problem completely on its own. I didn't want to make radical changes to the design. But I am willing to if it will get rid of the problem completely. What countermeasures do you think can be done here.

 

[TugboatEng]

If you go to the Misumi catalog page OP "claims" the pin is from, there is a hard chrome option available so this should be an easy solution. However, OP "claims" to be using a certain pin part number but the part number indicates black oxide coating and OP's pin clearly is not black oxide coated. Because of this, we have no idea what pin OP is using. Before making any changes to the design, we first need to verify the properties of the pin.

 

[Imposter666]

TugboatEng:
Our maintenance group has tried both pins. They both failed in the similar fashion.

 

[DAVIDSTECKER]

If the pin in the upper most connection to the rectangular bar is not showing signs of wear then maybe you might want to look into welding a Tab to the chain so a cylindrical hole can engage the pin with more surface area.
I'd run the weld connection by the welding folks for their thought and insight.
[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1611592055/tips/Chain_Tab_ghnasb.pdf[/url]

 

[Strong]

A lot of good suggestions, especially about a sleeve in last chain link.
Does the chain go completely slack during the load cycle? If yes, then position changes between pin and chain link might be changed (several ways) to reduce friction.

If the load is applied or released quickly during the 850 cycles/day, then the dynamic load may be much higher than the design static load. Consider reducing loading rate or damping dynamic load.

Walt

 

[Imposter666]

Yeah, the thing is these are off the shelf purchased parts that are stored as spares by our maintenance group. I don't want to modify a purchased part.

 

[Imposter666]

DAVIDSTECKER:
I appreciate you taking your time to sketch that!

 

[SwinnyGG]

If you can't make anything to solve your problem, you need to buy your way out... and there's severable viable solutions on that path above.

 

[DAVIDSTECKER]

Imposter666,
Your welcome, I hope it leads to a solution for you.
Peerless Chain has a group for custom fittings incase you need an outside source.
Best regards, David