How To Hem Sheet Metal

Sheet metal hemming a round hole.

How to hem sheet metal. Measure and mark your hem plus your. This means your flat hem will elongate the material by 0 031 in and this needs to be accounted for in the flat pattern layout. In the hemming process the bend is started with an acute tool set and then flattened in flattening dies figure 6. However hemming a round hole is just as important.

Roll hemming operation can also be divided into several pre hemming and final hemming process steps. A two stage hemming die works by using a deep channeled die and an acute. 0 074 0 43 0 031 in. Three stage hemming punch and die.

The hem is primarily used for reinforcement safety and edge appearance figure 4. Make joint convert the intersection of two walls into a joint feature either a bend walls joined by cylindrical geometry or a rip small gap between two walls. 0 074 in material you would first calculate the hem elongation factor by multiplying 43 percent by the material thickness. Tab add a tab to a sheet metal flange.

A seam is a method of joining two pieces of sheet metal together figure 5. An industrial robot guides the hemming roller and forms the flange. Sheet metal hems multi tool setup acute tooling and flattening die. Measure and mark your hem length from one edge of your metal.

Two stage hemming punch and die combination. This is putting a simple hem on a curved piece of zinc with a 7ft radius. Granted i can do it with a sweep command but i believe it should be available in the hem command. Scratch a line parallel to the edge you measured from through your marked measurement.

The simplest form of hemming set up is combining two different. Production plants for conventional die hemming are very expensive but the cycle times are very low. Hem create a hem for each edge face selected on an existing sheet metal part. Here we demonstrated the hemming process in press brake machine.

Roll hemming is carried out incrementally with a hemming roller. The hem command in sheet metal will not allow you to hem a round hole. You can hem straight edges all day with no problems at all. The order of operations for this step are as follows.