I reckon you mean the freewheel?
If so, you don't normally need to remove it to replace an axle (assuming cup-and-cone bearings, which any wheel old enough to take a freewheel (as opposed to a freehub cassette) will probably have).
Start again from the beginning, though - what are you actually trying to accomplish and why?
when i was in the bike shop getting a new chain and free wheel the guy said he shighting my back axle and it was not rubbing on the frame and i thought if i change my axle it would be ok
So what is strighting? Do you mean straightening? If so what was he straightening? Presumably if something is still rubbing whatever wasn't very successful.
If the tyre is rubbing on the frame just at some point/s in the wheel's rotation, then this is because the rim is buckled and the wheel needs "truing" (straightening) by adjusting the spoke tension (or possibly rebuilding the wheel with a new rim if it's damaged beyond repair).
If the axle is bent, then the tyre will probably be shifted toward one side of the frame, and will rub (or nearly rub) at all points around the rotation.
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If so, you don't normally need to remove it to replace an axle (assuming cup-and-cone bearings, which any wheel old enough to take a freewheel (as opposed to a freehub cassette) will probably have).
Start again from the beginning, though - what are you actually trying to accomplish and why?
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There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools
If the axle is bent, then the tyre will probably be shifted toward one side of the frame, and will rub (or nearly rub) at all points around the rotation.
If your English isn't good then maybe posting some pictures would help?
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