Primary burr
Primary burr refers to a material protrusion that arises directly during a separation or cutting process.
It forms directly at the cutting edge of the workpiece and influences the subsequent edge and surface processing.
Formation of primary burr
Primary burrs form when material is plastically displaced or not completely separated during the cutting process. Burr formation depends, among other things, on the manufacturing process used, the process parameters, and the material behavior.
Typical causes
- thermal cutting processes
- mechanical processing
- tool wear
- unsuitable process parameters
- material displacement at the cut edge
Effects on edge processing
Remaining primary burrs affect edge quality and complicate reproducible subsequent processes. Particularly in mechanical post-processing, an uneven initial condition can lead to unstable material removal and material displacement at the edge.
Possible effects
- uneven edge finishing
- increased tool wear
- unstable coating conditions
- increased post-processing effort
- impairment of occupational safety
Pre-grinding and deburring as a process step
In the pre-grinding and deburring process step, primary burrs are removed in a controlled manner to create a homogeneous starting condition for subsequent processing steps.
Depending on the material, burr thickness and process requirements, different tooling solutions are used.
Difference between primary burr and secondary burr
Primary burrs form directly during the cutting process. Secondary burrs, on the other hand, form in subsequent machining processes due to plastic material displacement and uncontrolled tool engagement.
Technical differences
- Primary burr: arises directly during the cutting or separating process
- Secondary burr: results from material displacement in subsequent processes
- Primary burr: often sharp-edged material protrusion
- Secondary burr: frequent material dumping near the surface
FAQ
Why must the primary burr be removed?
Primary burrs affect edge quality, subsequent processes and the further processing of sheet metal components.
In which processes does primary burr form?
Primary burrs are created during thermal and mechanical cutting processes such as laser cutting, punching or plasma cutting.