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Hemming, or flattening, is a great way to finish sharp edges and to strengthen parts of sheet metal products.

Finishing of sharp edges

Hemming - folding over the edge of a sheet - is used to eliminate the exposure of sharp edges and burrs, in areas where the part would otherwise be dangerous to handle. Another benefit of hemming is that it improves the aesthetics of a bent part.

Product strengthening

Hemming is also used for strengthening a product. Hemming the edge of a sheet doubles the material thickness and creates a U-profile. This will strengthen and stiffen the hemmed parts of the final product.

How to find the right hemming tools

Depending on your frequency of hemming and the material thicknesses you use, WILA offers a full range of hemming tools to fit your every need. Watch the video for more information on our hemming products or check the product information below.

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WILA hemming solutions

Frequently Asked Questions

Depending on the material and your tool set-up, you can hem sheet metal up to 4mm thick. Check out our product specifications or contact WILA for advice.

The first step when creating a hem is to make a 30° bend. The shortest hem you can make depends on the minimum flange length you can bend in this step. You can look up the minimum flange length for WILA bottom tools in the WILA Smart Tooling app.

Unfortunately, creating a hem will always leave marking on the sheet.

Alas, a hemming operation will always damage the foil and will leave marking on the product.

Yes, you can! The end result depends on the radius that is created when making the 30° pre-bend and also on the depth of the hemming stroke.

Check out the tonnage chart for flattening in the WILA catalog for required tonnages.

Check out the tonnage chart for flattening in the WILA catalog for required tonnages.

Yes, you can! But because the sheet thickness is doubled, you should adjust your tool set-up accordingly.

Provide WILA with the material thickness and hemming frequency and receive our hemming flyer and expert advice on the best solution for your needs.

Our hydraulic Dutch bending tables can be used for automating the hemming process. Contact WILA to explore your options.

Try to make the pre-bend as sharp as you can. Also check if the material and thickness are suitable for the hemming tool you are using.

Not if you use your hemming tools correctly. When hemming thicker materials, side forces can be eliminated by using our hammer tools in combination with a rolling table.

Get in touch with a hemming expert

If you have any questions on hemming sheet metal or would like to know more about our hemming solutions, don't hesitate to contact us. Our sales engineers are happy to help.

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