Temperature processing for 7005 series aluminum?- Mtbr.com
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  1. #1
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    Temperature processing for 7005 series aluminum?

    I've called around a bit locally and
    1) Nobody wants to touch a 1 bike frame job.
    2) Firing up the oven is like $200-400, then it's a decent amount more to process the frame.

    Since I only want to do a frame or two as an experiment (and I don't have any friends with pizza ovens, bummer!) I thought I'd ask here and see if anyone out there knows of a place that will toss a frame in with a larger 7005 (bike frames or otherwise) batch for a reasonable price. No need for it to be local/UT based, I can just ship the frame and have it shipped back and still be saving a fortune.

    Ideas? PVD, who (if anyone) did you end up using back a decade or so ago?

    -Walt

  2. #2
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    Quote Originally Posted by Walt View Post
    I've called around a bit locally and
    1) Nobody wants to touch a 1 bike frame job.
    2) Firing up the oven is like $200-400, then it's a decent amount more to process the frame.

    Since I only want to do a frame or two as an experiment (and I don't have any friends with pizza ovens, bummer!) I thought I'd ask here and see if anyone out there knows of a place that will toss a frame in with a larger 7005 (bike frames or otherwise) batch for a reasonable price. No need for it to be local/UT based, I can just ship the frame and have it shipped back and still be saving a fortune.

    Ideas? PVD, who (if anyone) did you end up using back a decade or so ago?

    -Walt
    Did you try Yess BMX here in BC?

    YESSBMX

    Might be a pain in the butt shipping back - n - forth over the border.

    If my memory is correct they built some of the Cove frames over the years.

  3. #3
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    You should contact one of the smaller domestic brands and see if you can put it in with one of their batches. Like just call Toma.... I mean maybe Yet.... Or maybe Inten*...

    Oh, maybe not such a good idea after all.

    *I think they were actually 6061 when they made Al bikes

    But seriously, what about Durango Bike Company or Guerilla Gravity? Might be 6000 series, but worth a shot. I'm guessing you want to use 7005 for availability?

  4. #4
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    A question here, simply because I have not looked up the spec for 7005 recently.
    I recall that 7005 was produced so that the production process did not require a heat treatment after welding. Have I got that right?

    Eric
    If I don't make an attempt, how will I know if it will work?

  5. #5
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    Quote Originally Posted by Walt View Post
    I've called around a bit locally and
    1) Nobody wants to touch a 1 bike frame job.
    2) Firing up the oven is like $200-400, then it's a decent amount more to process the frame.

    Since I only want to do a frame or two as an experiment (and I don't have any friends with pizza ovens, bummer!)
    A large oven for pottery might be big enough, they often have decent programmable temperature controls

  6. #6
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    Correct, but "heat treating" is a different thing than "aging", which 7005 does require. You don't full anneal it like 6061, but you do need to do about 6 hours of baking at relatively low temperatures (or wait a long, long time).

    6061 requires a full (900F or something) annealing/heat treating, alignment work (because it comes out of alignment in that process) and then an aging treatment. So it's a bit impractical unless you are doing big batches or live next door to the temperature processing place.

    I suppose you could do 6061, have it annealed/heat treated, get the frame back and align it, and then take it back for aging. For one-off frames the cost and annoyance factor are both going to add up quickly.

    -Walt

  7. #7
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    Walt, do you know what the heat schedule is for 7005? I know the required heat goes down if you age it longer, I just don't know what the graph looks like.

    I'm in the middle of building a powdercoat oven, and I'm hoping it'll go up to 600 F. I know it will definitely go up to 450, and probably 500. Once it's done, I can do a test and see how hot it gets, and you're welcome to send one my way for post weld aging. That project is easily a month or two out from being finished, however. Not sure what your timeline is.
    Myth Cycles handbuilt bike frames
    Durango, CO
    http://www.mythcycles.com

  8. #8
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    Ok, just found this:

    http://www.ahrensbicycles.com/Alumin...08%20NAHBS.pdf

    Looks like the schedule is 6 hours at 200F, then 4 hours at 320? I'm not actually sure if it's one then the other, or one OR the other. That page is just a presentation, so not super detailed.

    If you're playing around with making a full sus Alu frame (like I'm thinking of doing) You could probably fit the front and rear triangles into a regular oven. Maybe not the one at home, but there are always free/cheap ones on CL.

    Just a thought. Either way, my oven will definitely do this once it's up and running.
    Myth Cycles handbuilt bike frames
    Durango, CO
    http://www.mythcycles.com

  9. #9
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    Are Erichimedes' findings similar to yours Walt? If so, I've got access to a bike frame sized powdercoat oven.

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