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The process for both hemming and seaming are the same, except that the tonnage (amount of force exerted) requirement is greater for seaming. The process starts by bending the edge to an acute angle. A flattening die is then used to flatten the hem.
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112:. Closed hems are completely flush while open hems have an air pocket in the bend. The major difference is that the tonnage required for a closed hem is much greater than that for an open hem.
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edge is rolled over onto itself. Hemming is the process in which the edge is rolled flush to itself, while a seam joins the edges of two materials.
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Drozda, Tom; Wick, Charles; Bakerjian, Ramon; Veilleux, Raymond F.; Petro, Louis (10 December 1984),
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Hems are commonly used to reinforce an edge, hide burrs and rough edges, and improve appearance.
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Tons per meter requirement for hemming cold-rolled steel and stainless steel
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Seams are commonly used in the food industry on canned goods, on
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Press brake technology: a guide to precision sheet metal bending
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299:Benson, Steve D. (1997),
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18:Seaming (metalworking)
65:processes in which a
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250:References
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233:See also
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55:Hemming
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50:A seam
100:Types
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
