Open Hem Sheet Metal

When working with a brake press hems are always created in a two step process.

Open hem sheet metal.

Automotives parts such as deck lids trunk lids doors hoods and tailgates formed by hemming process requires sheet material to have high strength to weight ratio with excellent bending abilities without crack and fracture. Hems are commonly used to reinforce an edge hide burrs and rough edges and improve appearance. 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. Figure 1a this is a cad setup for an open hem on two edges.

A reader recently asked for guidance in using 3 d cad for sheet metal parts. Create a bend with acute angle tooling in the metal 30 is preferable but 45 will work for some circumstances. In sheet metal hemming means to fold the metal back on itself. Sheet metal hemming process finds its major applications in the manufacturing of parts pertaining to the automotive parts.

For bends the minimum distance between the inside edge of the bend and the outside of the hem should be 5 times material thickness plus bend radius plus hem radius. For open hem the bend will lose its roundness when the inside diameter is greater than the sheet metal thickness. Create a bend with acute angle tooling in the metal 30 is preferable but 45 will work for some circumstances. When working with a brake press hems are always created in a two step process.

Hemming and seaming are two similar metalworking processes in which a sheet metal edge is rolled over onto itself. Note that closed hems teardrop and edge bead are all available from this control panel.