What is 3D laser cutting?
3D laser cutting means that a laser beam is guided in several axes, usually by a multi-axis system (e.g. 5-axis), so that it can cut in different directions and follow three-dimensional shapes. This can include:
- Cut-outs in bent sheet metal parts without flattening them
- Trimming of molded or deep drawn components
- Holes, slots and contours in pipes and profiles
- Beveled cuts or angled cuts for a better fit when welding
- Precise recesses in geometries where traditional tools struggle to reach
It is mainly a method for when the part is no longer “flat”, but the requirement for accuracy and quick changeover is still high.
How the process works in practice
The process can be described in four steps:
Documentation and programming
This is often based on a 3D CAD model. The cutting paths are programmed so that the laser head can follow the shape of the part and create the correct geometry, taking into account angles, accessibility and tolerances, for example.
Fixturing and positioning
Since the part is three-dimensional, it needs to be held stably and repetitively in a fixture. The fixture affects both precision and cycle time. Good fixturing is often the key to a consistent result.
Cutting with customized parameters
The laser power, focus, cutting speed and any auxiliary means (e.g. shielding gas) are adjusted according to the material, thickness, geometry and cut surface requirements.
Control and post-processing
After cutting, the parts may need deburring, washing, bending (if not already bent), welding or other processing. Measuring and checking can be done with measuring equipment or comparison against CAD.
The difference between 2D and 3D laser cutting
It's easy to think that 3D laser cutting is just “2D but multi-directional”, but the differences are important:
- Geometry2D fits flat sheets. 3D handles shaped and angled surfaces.
- Fixturation2D can often be cut directly on tables. 3D often requires a fixture.
- Programming: 3D requires more advanced trajectory planning and collision control.
- Tolerances: Both 2D and 3D can be very accurate, but in 3D, fixture, shape variations and measurement references have more impact.
- Flexibility3D is particularly useful for varying geometries and smaller series where heavy tooling investment is not reasonable.
Advantages of 3D laser cutting
High precision and repeatability
The right process gives very good dimensional accuracy, especially in hole patterns and recesses that must fit against other components.
Rapid transition
Compared to punching tools or special milling, 3D lasers can be quickly switched between variants. This makes it attractive for prototypes and medium-sized series.
Complex shapes without special tools
Recesses, oblique cuts and contours in bent or shaped parts can be made directly, without the need for special tools or multiple clamping.
Possibility of bevelled cuts
Angled cuts can facilitate assembly and welding, and in some cases reduce the need for post-processing.
Thor Ahlgren and the path to the right solution
At Thor Ahlgren, we work with laser cutting as an important part of modern sheet metal and manufacturing logic where quality, repeatability and delivery reliability are key. Whether the need is for a clear 2D process in sheet metal or you are evaluating 3D laser cutting for more complex geometries, it is smart to start in the requirements picture: function, tolerances, volumes and subsequent steps in production.