Double Hem Sheet Metal

Hemming and seaming are two similar metalworking processes in which a sheet metal edge is rolled over onto itself.

Double hem sheet metal.

Let s begin by looking at the hem. In car part production hemming is used in assembly as a secondary operation after deep drawing trimming and flanging operations to join two sheet metal parts outer and inner together. The flat pattern of a hem is not calculated in the same fashion as a typical bend. 2 56 is often specified in the plans objects such as ice cube trays funnels garbage pails and other articles formed from sheet metal are fabricated with wire edges to strengthen and stiffen the jobs and to eliminate sharp edges the.

As the name indicates a double fold hem is made when you fold the fabric over on itself to the wrong side two times to hide the raw edges and create a neat finished hemline. Double hem edge hem and double metal thickness bend for support using a hem to create advanced profiles. The double fold hem is the most basic hem out there which also makes it one of the most useful hems you can learn. They did and in some cases are still used.

Sheet metal hem features are typically added to provide one or more thicknesses of material along an edge of a face or flange. Hemming is a metalworking process where a sheet metal edge is mechanically bent to fit an uneven surface or simply roll over onto itself. You can create single double rolled and teardrop hems. Typical parts for this type of assembly are hoods doors trunk lids and fenders.

A hem provides stiffness to a design or provides a smooth rounded external edge on a part to eliminate sharp edges. Hemming is the process in which the edge is rolled flush to itself while a seam joins the edges of two materials. Hems are most often used to remove a sharp untreated edge and make it safe for handling. Determining flat patterns of hems.

A wire edge fig. It s not that a pittsburgh or double lap seams didn t work. Hemming is nothing but to fold the metal back on itself. In sheet metal hemming means to fold the metal back on itself.

While those in the sheet metal trade form dozens of different kinds of hems and seams most are simply outdated and only three are in general use.