Problem of Wrinkle Formation

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Devchand Member Join Date: May 2012 Posts: 9	Problem of Wrinkle Formation 05/13/2012 6:47 PM
	Currently I am developing a Radiator by cold rolling steel sheet of thickness 1.60mm with the help of single stand rolling mill using one pair of roller set of diametre 270mm.The purpose of rollers is to develop the grooves in the sheet.Two such sheets are then spot welded. While I am able to get the groove profiles developed in the sheet satisfactorily, I am finding severe wrinkle formations in the edges ,both the sides, all along.The roller is checked for its alignment which is found to be satisfactory.Hardness of the sheet is also verified and the same is found to be consistent.I would like to know what could be the other reasons for such problem? I would also like to know about the design fundamentals for building a Spot Welding Machine for cold rolled steel sheets of the thickness 1.60mm and for 3.15 mm . Regards! Shah D.
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durtieduck Guru Join Date: Jan 2011 Posts: 668 Good Answers: 3	#1 Re: Problem of Wrinkle Formation 05/13/2012 9:26 PM
	do you have enough pressure on the steel sheet to prevent slippage? is the metal free of oil? are the rollers clean? are the rollers strong enough to not distort under pressure? are you running the sheets through the rollers too fast? would it help to run the sheets though the rollers in increments.
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user-deleted-1105 Guru Join Date: May 2007 Location: Harlow England Posts: 16512 Good Answers: 670	#2 Re: Problem of Wrinkle Formation 05/14/2012 7:13 AM
	Not my field of expertise at all, so I may be talking nonsense. Maybe it's some sort of oscillation being set up, may a slot to guide the edge after the rollers might help prevent the mforming. Sorry if this is daft, but sometimes an outsiders perspective can help. Del (PS. High speed video might show what's going on. You can always use it to check your bowling action too) __________________ health warning: These posts may contain traces of nut.
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nick name Guru Join Date: Mar 2007 Location: City of Light Posts: 3943 Good Answers: 183	#3 Re: Problem of Wrinkle Formation 05/14/2012 9:26 AM
	Could you send a picture of the sheet before and after rolling? It may help to find an explanation and may be a solution.
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techmad Associate Join Date: Dec 2011 Location: New Zealand Posts: 32 Good Answers: 4	#4 Re: Problem of Wrinkle Formation 05/15/2012 12:03 AM
	Its hard to say exactly from the information provided but it sounds like you are swaging a groove in the sheetmetal. The problem of wrinkling occurs because the material in the swage is not stretched just formed. This means that the sheetmetal is narrower where there is a swage then where there isn't, causing the distortion in the edge of the material. This can be eased by stretching the metal in the area where the swage will be formed, with an english wheel or similar. __________________ It is better to have people think you are an idiot, than to open your mouth and remove all doubt.
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otha Power-User Join Date: Oct 2008 Location: Meherrin Virginia Posts: 319 Good Answers: 6	#5 Re: Problem of Wrinkle Formation 05/15/2012 8:05 AM
	Sounds like you are making a plate type cooler, Those are commercially available. __________________ If you fail to follow through, you will fail.
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Javier Aseguinolaza Associate Join Date: Feb 2010 Location: Spain Posts: 33	#6 Re: Problem of Wrinkle Formation 05/15/2012 1:39 PM
	Please if posible send me the groove, rolling conditions and a picture. It could be that you got to get one part of the shape since a groove needs to comply for all the section, including avoiding any distortion like wristling is. javier@atecid.com __________________ If you want different results, don't do always the same (A. Einstein)
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jt Guru Join Date: Jun 2007 Posts: 719 Good Answers: 25	#7 Re: Problem of Wrinkle Formation 05/15/2012 2:02 PM
	Very limited knowledge, but I have done "some" rolling etc. Guessing, is it that the one edge is "free" while the other "edge" (part form opposite to the wrinkled edge) is being formed? Have you considered a close pre and/or follower pressure wheel? (as against leaving it free, to balance the pressure on each "edge") Would it be too costly to roll a small excess (part form) possibly at 90 degrees, and then use, or guillotine off the trim? Just ideas. jt. You could follow the Yellow Brick road?...... (tin man)
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