Sheet Metal Hem Design

It creates a very smooth edge and can hide the raw edge of the part.

Sheet metal hem design. When designing parts for laser cutting one should not make holes smaller than the thickness of the material. Design for manufacturability sheet metal guidelines bends for the ease of manufacturing multiple bends on the same plane should occur in the same direction. Sheet metal parts with a minimum of 0 9mm to 20mm in thickness can be manufactured. As a design element the hem creates the appearance of greater thickness without adding much weight.

Avoid large sheet metal parts with small bent flanges. A 1 degree tolerance on all bend angles. Next month concludes with the pros and cons of hems jogs and forming tools. In sheet metal hemming means to fold the metal back on itself.

In low carbon steel sheet metal the minimum radius of a bend should be one half the material thickness or 0 80 mm. In an open sheet metal part and in the graphics area select an edge as shown. 0 609mm to 0 138 in. Hems have drawbacks however.

Previous editions covered economic order quantity in batch production and the accuracy of things made from rolled sheet stock. Columnist gerald davis continues a discussion of 3 d cad and precision sheet metal manufacturing in part iii of a four part series focusing on design guidelines for sheet metal. The hem tool adds a hem to your sheet metal part at a selected edge. Sheet metal thickness ranges from 0 024 in.

Typical parts for this type of assembly are hoods doors trunk lids and fenders. Create a bend with acute angle tooling in the metal 30 is preferable but 45 will work for some circumstances. Because sheet metal parts are manufactured from a single sheet of metal the part must maintain uniform wall thickness. Bends in sheet metal are manufactured using sheet metal brakes.

Hems can be useful as a way to stiffen a sheet metal panel. The sheet metal tool allows you to quickly create sheet metal part designs using a simple design process all helping to save time and development costs. 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. When working with a brake press hems are always created in a two step process.

Sheet metal hemming process finds its major applications in the manufacturing of parts pertaining to the automotive parts. This is sometimes a way to add durability to painted parts.