Will my bent sheet metal parts show die marks?

Yes, there will be small score lines along the outer surface of your bent sheet metal parts. These marks are caused by the die used to bend your parts. Die marks are an inherent part of the sheet metal bending process and are generally unavoidable when using standard bending equipment.

The die marks appear as subtle lines or indentations running parallel to the bend. They occur because the material is pressed against the die during bending, leaving a slight impression. The visibility of these marks can vary depending on factors like the material type, thickness, and the specific bending process used. Softer metals like aluminum may show more pronounced die marks compared to harder materials like steel.

It's important to note that die marks are typically considered normal and acceptable in most sheet metal applications. They don't usually affect the structural integrity or functionality of the part. However, if you require a completely smooth surface for aesthetic reasons or specific functional requirements, you may need to consider additional finishing processes.

Powder coating can be an excellent solution if you need to hide die marks and achieve a smooth, uniform appearance. This process involves applying a dry powder to the metal surface and then curing it under heat to form a durable, attractive finish. Powder coating not only conceals die marks but also provides additional protection against corrosion and wear.