Brush chips

The Bürstspanen is a manufacturing method of the main group separation , which depending on the application for machining is counted with or without geometrically defined cutting edge.

According to DIN 8589, brush chipping is "chipping with a brush tool, primarily to change the surface structure but also the shape of workpieces".

The processing can serve both for smoothing and for roughening a material surface. Special areas of application are the deburring of rolled, stamped, welded and cast parts as well as the structuring of soft surfaces such as certain natural stones, textiles, leather and wood. Working out the grain of wooden surfaces is also known as brushing .

The tools used are predominantly rotating brushes with metal wires ( "steel brushes" ) or plastic threads as fill material. Plastic bristles can also contain abrasives and are then referred to as abrasive filaments , abrasive bristles or abrasive brushes .

Machining with a geometrically defined cutting edge

The Bürstspanen (with steel or brass brushes) is run as a "chip manufacturing process end with a geometrically defined cutting edge" in the DIN 8589th

This type of brush chipping was also known as needle milling in the past . The brushes consist of a large number of elastic wires. Depending on the application, brass wire , ordinary steel wire or hard spring steel is used. The wire pins wear out during use and the distance between the tool and the material being processed must be reduced.

In woodworking, brush shaving can be used to work out the wood grain (so-called "brushing"). Processing with brush tools to remove rust, scale or surface contamination is assigned to the cleaning production process according to DIN.

Cutting with a geometrically undefined cutting edge

In the meantime, abrasive brushes with plastic bristles (made of polyamide ) and abrasive nonwovens , which are interspersed with abrasive substances , are widely used. Metallic bristles are also rarely coated with hard materials.

These are well suited for processing fibrous material such as wood, unevenly structured composite materials such as plastering mortar and porous surfaces such as natural stone and clinker , since the wires of metal brushes often leave grooves and tracks on soft surfaces and discolorations on porous material.

Since the grit of the hard materials used such as silicon carbide or aluminum oxide grains in a wide range can be adjusted, suitable abrasive filaments for challenging work, such as the glazing of stainless steel profiles .

Clean

Brushing off corrosion products , scale , coatings or impurities is assigned to the cleaning process by DIN .

Metal or plastic brushes with abrasive trimmings can be used to clean workpiece surfaces.

Brushes with leather or natural fibers such as sisal are also used to clean and smooth soft surfaces . In the technical sense, however, chips can only be produced with additionally added abrasive substances such as polishing agents or pastes. Only the fine teeth of palm leaf fibers , which are referred to as fibers in the trade , can also have a cutting effect.

literature

Uwe Heisel, Fritz Klocke, Eckart Uhlmann, Günter Spur : manual cutting. Hanser, Munich 2014, ISBN 978-3-446-42826-3 , p. 24.

Footnotes

↑ ^a ^b Bürstspanen , In: Fachwissen-Technik.de, accessed in March 2019.
↑ ^a ^b ^c Daniel Landenberger, Rolf Steinhilper: Reduce surface roughness by brushing. In: MAV.Industrie.de, accessed in March 2019.

[Fachwissen-Technik-1] Bürstspanen , In: Fachwissen-Technik.de, accessed in March 2019.

[mav-2] Daniel Landenberger, Rolf Steinhilper: Reduce surface roughness by brushing. In: MAV.Industrie.de, accessed in March 2019.