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residual magnet

  • Thread starter Thread starter rinato
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rinato

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Hello, I have a strange question to ask you:
we have built a couple of pieces that must be coupled to each other as an attachment (I have removed the influential details )
they were both hardened and then obviously needed a rectification on the main floors, through tangential rectification with magnetic plane.
I am now in the strange condition in which every single piece has been demagnetized*, even with the special tool (300w), which has always done its dirty work, but from assembled they show a remarkable magnetic residue, enough to save the galvanized sheet**** which must, instead, flow above freely.

My question is: how do magnetic fields redisidui behave in hardened steels? Are they exponentially added?

that of tts tells me that if I can't be demagnetized with the demagentizer, I must, at the limit, repeat; so I overcome the tempering of "I don't know who" and the pieces are cleaned. the problem is that they have now been finished in tolerance etc., for assembly, and if portraits are to be blessed the tolls.

question semiseria: if I insert a sheet of aluminum, copper, lead, crypttonite under the small piece, in the pocket, can I disturb the residual magnetism that seems to concatenate?

thanks for the attention and for the possible help,
Reborn.

*smagnetized front/back, long "x" and long "y".
** the sheet, 12/10, flat, covers the outer part completely, and is free of holes
 

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Well tool steels magnetize more than c40 due to alloy materials. you can demagnetize with magnetization cycles and slimming. Of course that making tempering with full ricottura brings everything normal but loses the tempering treatment if you did it and geometry can relax of a few cent or tenth of mm.
 
by now the pieces have been mounted and "glued", if nothing else successfully for all other aspects. I am not inclined to reinfornate the pieces at this point.
 
epilogue: I tracked a 700w demagnetizer and I passed the small piece (the only fast demountable) a reasonable number of times and the problem seems solved.
 

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