Chair squeal

My folding chair makes the most horrible sound when it opens and closes.  I imagine if an elephant stubbed her little toe, the scream would sound something like this.

I can't figure out if it's in the pivot place or the track.

Any thoughts on how to stop it squealing?

graphite powder
which it works on squeaky door hinges as well
i need to follow my own advice and silence the one to my room!

That's a good idea.

I was going to try oil, but the groove/track isn't lined with anything and I don't want to make the wood swell.  

I'll see if we have some graphite.

I wonder if it's possible to take the chair apart and sand the grove?

A fast and easy fix would be a bar of hand soap rubbed on all the the moving parts then clean up with a clean dry rag or paper towel.
A better fix would be to make up a batch of your own furniture polish.
All you need is a bottle of mineral oil and some bees wax. Maybe some essential oils if you want to add a little personal touch.
Use a double boiler to warm the mineral oil to the point it will dissolve the wax. Stir it up to mix the two and your done.
One ounce of wax to a 12 ounce bottle makes a thin gel. I prefer around 2 ounces of wax.  After the mix cools it is a thick gel. Now you have a long lasting fix for lubricating wooden moving parts and a very good water resistant polish for all your furniture.
Put on thick where you have moving parts, then polish the whole chair and any thing else that needs it.
Works very well on wooden butcher blocks as well. All the ingredients are food safe.

Baby powder works on noisy floorboards, so it might work on the chair. It's a shame that they grind up perfectly good babies, to provide us with this product.

The chair looks to be glued together so trying to completely disassemble it is risky. Graphite will likely work but only for a short time. The mineral oil & beeswax gets my vote.