Hemming and seaming are two similar metalworking processes in which a sheet metal 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.[1]
hemming process
A closed hem
A seam
Hems are commonly used to reinforce an edge, hide burrs and rough edges, and improve appearance.[1]
Seams are commonly used in the food industry on canned goods, on amusement park cars, in metal roofing (with a roof seamer), and in the automotive industry.
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.[1]
Types
There are two types of hemmed edges: closed hems and open hems. 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.[2]
Tons per meter requirement for hemming cold-rolled steel and stainless steel[2]
Benson, Steve D. (1997), Press brake technology: a guide to precision sheet metal bending, SME, ISBN978-0-87263-483-1.
Further reading
Drozda, Tom; Wick, Charles; Bakerjian, Ramon; Veilleux, Raymond F.; Petro, Louis, Tool and manufacturing engineers handbook: Forming, vol. 2, SME, p. 4-9, ISBN0-87263-135-4.
May 08, 2023
hemming, seaming, similar, metalworking, processes, which, sheet, metal, edge, rolled, over, onto, itself, hemming, process, which, edge, rolled, flush, itself, while, seam, joins, edges, materials, hemming, process, closed, seam, hems, commonly, used, reinfor. Hemming and seaming are two similar metalworking processes in which a sheet metal 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 1 hemming process A closed hem A seam Hems are commonly used to reinforce an edge hide burrs and rough edges and improve appearance 1 Seams are commonly used in the food industry on canned goods on amusement park cars in metal roofing with a roof seamer and in the automotive industry Contents 1 Process 2 Types 3 See also 4 References 4 1 Bibliography 5 Further readingProcess EditThe 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 1 Types EditThere are two types of hemmed edges closed hems and open hems 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 2 Tons per meter requirement for hemming cold rolled steel and stainless steel 2 Material thickness mm Open hem Closed hem0 6 9 230 8 12 321 0 15 401 2 17 501 6 24 632 0 30 802 6 55 903 2 70 1004 5 105 200See also EditCan seamer Automotive hemmingReferences Edit a b c Benson 1997 p 137 a b Benson 1997 p 138 Bibliography Edit Benson Steve D 1997 Press brake technology a guide to precision sheet metal bending SME ISBN 978 0 87263 483 1 Further reading EditDrozda Tom Wick Charles Bakerjian Ramon Veilleux Raymond F Petro Louis Tool and manufacturing engineers handbook Forming vol 2 SME p 4 9 ISBN 0 87263 135 4 Retrieved from https en wikipedia org w index php title Hemming and seaming amp oldid 1059163493, wikipedia, wiki, book, books, library,
