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Hemming and seaming
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.〔.〕
Hems are commonly used to reinforce an edge, hide burrs and rough edges, and improve appearance.〔
Seams are commonly used in the food industry on canned goods, on amusement park cars, and in the automotive industry.
==Process==
The process for both hemming and seaming are the same, except that the tonnage 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.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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