A good way bend and a bad way bend – Sheet metal forming
We used to receive many RFQ (Request Of Quotation) from our customers asking for price offer. If you study the prints carefully, you may see some sheet metal components were designed in the bed way bend. The bend radii are stated as sharp or only a small radius is allowed. When we spotted this error, we used to feed back to the component designer asking for a change in design or to enlarge the bend radius.
So, what is a good way and bad way bends. In general, the good way bend is the axis of bend perpendicular to the rolling direction (Grain flow) of the sheet metal, the bed way is the bending axis parallel to the rolling direction. A good way bend, the sheet metal can be formed or bent with sharp or small bend radius without having any crack or rupture at the bent edge, but the bad way requires a larger bend radius in order to avoid crack at the bent edge.
The minimum allowable bend radius difference from different material type. Just a general guideline, the softer and thinner the material, the smaller the allowable bend radius compare to the harder and thicker material.
A general guideline, a cold roll steel which under 1.5mm thick, the minimum allowable radius is equal to the thickness of the material for 90 degree bend, material from 1.5mm-2.0 mm thick, the minimum allowable bend radius will be ranging from 1.5-2.5 time the material thickness.
Detail of the allowable bend radius can be found at our Tool design site under bend radius.
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I would like to know more about part lubrication while deep drawing
Hi vishwanath Desai
Thanks for visiting. I do have some information on deep drawn lubrication, I will put it up later when time is permitted. Do come back again or follow my Twitter for latest info.
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