Slag removal from sheet metal – basis for stable subsequent processes
Slag removal in sheet metal processing
Thermal cutting processes such as plasma or oxyfuel cutting result in slag adhesion to sheet metal components. This consists of solidified molten metal that is mechanically bonded to the component surface and affects subsequent processing steps.
To remove slag, this mechanical bond must be selectively broken. The crucial factor is not grinding down the surface, but rather the controlled removal of the slag deposits.
Unlike oxide layers, slag is not a chemical reaction layer, but solidified material that adheres mechanically to the component surface.
Slag removal is the first step in edge and surface finishing. In this step, slag deposits are selectively removed using... slag hammer brushes
solved to create a uniform starting state for the subsequent processes.
This defined component condition is the prerequisite for stable and reproducible subsequent processes such as pre-grinding, deburring and edge rounding.
What is slag and how is it formed?
Slag is produced during thermal cutting processes such as plasma or oxyfuel cutting due to the melting of the material. During the cutting process, material is locally liquefied and carried away from the kerf by the cutting gas flow.
However, some of this molten metal solidifies at the bottom edge of the component, forming solid slag deposits. These consist of solidified base material and are mechanically bonded to the component surface.
The amount of slag produced depends on process parameters such as cutting speed, temperature control, and material thickness. Inadequately controlled process conditions lead to increased slag formation.
Why is slag removal necessary?
Remaining slag on sheet metal components leads to uneven machining conditions in subsequent processing steps. Controlled material removal is not possible because tools cannot act uniformly on the component surface.
This creates unstable process conditions, leading to uneven material removal, fluctuating edge quality, and increased tool wear. Reproducible results are particularly hindered in subsequent processes such as pre-grinding, deburring, and edge rounding.
In addition, remaining slag residues impair the coating capability, as they can lead to uneven adhesion of coating systems and thus to quality problems.
Slag removal therefore ensures that a uniform and defined initial state is created, enabling stable and reproducible subsequent processes.
Comparison of methods for slag removal
Manual, hand-operated, and mechanized methods are available for slag removal. They differ in terms of reproducibility, processing time, operator workload, and impact on the subsequent process.
Hammer and chisel
Hammer and chisel are used to manually remove individual slag deposits. The slag is chipped away at specific points. This method is particularly suitable for rework, but is highly dependent on the operator.
- Spot processing possible
- High manual effort
- Strong operator dependency
- Low reproducibility in serially produced components
ANGLE GRINDER
The angle grinder is used for hand-held mechanical finishing. Slag can be removed flexibly, but there is also a risk of uneven material removal at the edge and surface.
- Flexible application
- Faster than manual methods
- Risk of uncontrolled material removal
- Fluctuating result quality possible
Mechanical slag removal
In mechanical slag removal, slag deposits are loosened by controlled impulses. This allows slag to be removed mechanically without unnecessarily stressing the base material.
- Reproducible machining results
- High process reliability
- Reduced manual rework
- Uniform starting state for subsequent processes
Particularly suitable for series production and stable subsequent processes.
Mechanical tools are used to ensure consistent processing and reproducible results in slag removal.
Role of slag removal in the process chain
Slag removal is the first process step in edge and surface finishing and defines the initial state of the component for all subsequent processing steps.
Only when slag deposits are completely removed can tools in the subsequent pre-grinding, deburring and edge rounding act evenly on the component surface and achieve reproducible results.
Insufficient slag removal leads to unstable machining conditions, uneven material removal, and increased tool wear. This impairs process reliability throughout the entire machining chain.
Slag removal thus ensures that a defined component condition is created, enabling stable, economical and reproducible subsequent processes.
The edge and surface finishing of sheet metal is based on coordinated process steps. Slag removal creates the basis for a defined component condition, enabling consistent processing results, stable coating processes, and reproducible quality in series production.
Our customers' success
By customizing our tools for each customer, process times can be significantly reduced. A customer case shows that up to 80 % of processing time can be saved during deburring.
The latest generation of deburring discs maximizes the abrasive surface area thanks to the innovative arrangement and slotted structure of the abrasive flaps, increases material removal at the sheet metal edge and significantly improves the performance of your deburring machine.
Our customers benefit from our extensive consulting and application experience. This expertise guarantees maximum competitiveness through high-performance processes in every production environment.
Slag hammer brush in action
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More informationCompatible with common machine manufacturers
FAQ on slag removal from sheet metal
Answers regarding the causes, processes and effects of slag removal
Slag is produced during thermal cutting processes such as plasma or oxyfuel cutting. It consists of solidified molten metal that adheres mechanically to the underside or cut edge of the sheet metal.
These adhesions influence the initial state for subsequent processing steps.
Slag leads to uneven contact conditions between the tool and the workpiece. This results in unstable machining processes and increased tool wear.
The removal creates a defined component state for stable subsequent processes.
The tool engagement during pre-grinding and deburring is disrupted. This results in uneven material removal and fluctuating component quality.
Additionally, tool wear increases and process stability decreases.
Slag is solidified molten metal that adheres mechanically and exists as excess material.
Oxide layers, on the other hand, are chemically bonded reaction layers that lie flat on the surface and must be removed separately.
Slag removal is achieved through mechanical abrasion. In this process step, slag hammer brushes are used to selectively loosen slag deposits.
This creates a uniform starting condition for subsequent processing steps.
Removing slag creates a uniform surface, enabling stable tool engagement.
Without this step, uneven material removal and increased wear will occur.
The necessity depends on the cutting process. Plasma and oxyfuel cutting often produce a significant amount of slag, which must be removed.
It is usually less pronounced when laser cutting.
Manual methods lead to uneven material removal and fluctuating component quality.
Furthermore, they are time-consuming and not very reproducible compared to mechanized processes.
Slag creates uneven surfaces and local protrusions. This results in uneven layer thicknesses and coating defects.
This negatively affects the adhesion of coating systems.
The goal is a defined component condition free of coarse adhesions. This enables consistent tool engagement and stable subsequent processes.
Slag removal thus forms the basis for reproducible processing steps.
