Re: Bent Drawbar on JD530

Posted by T_Bone on November 20, 2002 at 11:04:25 from (65.57.38.154):

In Reply to: Bent Drawbar on JD530 posted by John on November 20, 2002 at 05:59:16:

Hi John,

You will have to use heat and a press. I have been known to use a chain and hydraulic jack as a press.

The heat will relax the grain structure so the metal can return to it's original shape then the bar will need to be heat treated to keep that shape. Using a cold press without heat will allow the bar to bend again very easy in the same spot.

Heat can be applied from several sources, oxy/act torch with a rose bud, propane, wood fire.

I would probably use wood heat for a preheat then finish with oxy/act for the acutal bending.

Heat the place that needs to be streghten plus several inches either side to a dull red then let "air" cool. This removes the temper from the steel (relaxes the grain structure). Then reheat again to cheery red then use the press to apply pressure to get it straight. This will take alot of heat and you have to work fairly fast. The heat needs to be applied on both sides and only where you want the bend to occur

After your done straighting the part and as the part is cooling the red area will turn a "straw color" (looks just like wheat straw) submerge the part in oil and let cool. The oil will stink and smoke so this is a outside job. 1-1/2" steel would take about 1/2hr in the oil to cool.

Next you will reheat the bar to about 500F. This will take some time as it has to be done slow so the 500F soaks all the way thru the bar without overheating. This is going to be difficult and take some time because of the draw-bar size. They sell temp sticks at a welding supply, melts when it gets to the tempature. A lead bath can also be used as lead melts at 450F, used wheel weights work good. You would need to heat soak it overnight using a lead bath.

Once to 500F then quinch in oil and let cool. This adds temper to the steel to resist bending.

T_Bone

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