PROCESS-SAFE DRILLING AND MILLING OF FIBRE PLASTICS
Tools for machining plastics, graphite, CFRP, GFRP, AFRP, Honeycomb and foams

CFRP & GFRP-TOOLS

One focus of our activities is the manufacture of milling cutters and drills for fibre plastics, both glass fibre and carbon fibre materials and combinations thereof. We see ourselves as a partner for aircraft construction and the automotive industry as well as their suppliers. The need for consulting is particularly high for "modern materials". We support our customers with words and deeds.

From the selection of the right tool, the appropriate cutting data to the final machining strategy, we are there for you. We offer solutions for fiber plastic processing and are constantly developing our know-how together with universities and training facilities throughout Germany. We would also be happy to work with you.

 

COMPRESSION CUTTERS FOR CFRP AND GFRP

Rapid Compression for process-safe processing of fibre plastics  

With SPPW compression milling cutters, the spiralization changes from left to right, which results in the axial cutting forces converging in the middle, i.e. being compressed. The milling cutters are available in three lengths so that compression can take place in the middle of the workpiece. This allows delamination problems to be mastered much better.

In addition, the milling cutters have chip breakers to ensure rapid chip removal and reduce the process temperature.

  • no delamination

  • high surface quality at the cutting edges     

  • safe removal of the chips

Rapid Compression milling cutters are especially designed for machining epoxy resin or polyester-based plastics with carbon or glass fibres. They make it possible to produce surfaces in finishing quality (ra<2 µm).

The SPPW compression milling cutter solves typical problems that occur when machining fibre plastics

Kompressionsfräser CFK (T800) Kompressionsfräser GFK (Epoxidharz GF-Anteil 74%)

DRILLING FROM CFRP AND GFRP

Drilling tools for reliable machining of CFRP/GFRP from SPPW

 

With special twist drills, reamers and high-performance cooling channel drills for fibre materials, Spanabhebende Präzisionswerkzeuge GmbH offers the right tool for every type of fibre.

Depending on the field of application and the desired properties, modern plastics are reinforced with carbon or glass fibres, which can be unidirectional, interwoven, interlaced or multidirectional. SPPW has developed the optimal drilling tool for drilling such fibre-reinforced materials and the various fibre types and proportions.

"Depending on the fiber type, delamination, fiber breakage, fiber overhang and unclean surfaces occur. Avoiding burr formation is also very important," explains Ulrich Schäfer, Sales Manager at SPPW, the difficulties involved in machining CFRP/GRP. "The aim of our new drilling tools is to counteract these effects and achieve fast and clean machining.

In addition to CFRP/GRP, fibre plastic/metal composites pose a particular challenge, since the drilling tool must be able to machine several materials with very different chip behavior.

In particular, the pressing of metal residues into the fibrous material must be avoided when drilling metal CFRP composites. SPPW has developed a special drilling tool for drilling holes in such metal-fiber hybrid materials that meets all requirements as a single-shot drill.

 

 

In addition to spiral drills with sickle tips or tip geometries with angles of less than or equal to 100 degrees, drill reamers distribute the cutting forces optimally during drilling and ensure delamination-free entry and exit of the bore as well as a special surface quality.

High-performance cooling channel drills with several cutting guide chamfers are particularly suitable for the efficient production of high-precision drill holes without delamination and fiber overhang. They can be supplied in various versions and as special drills with deburring function.

731180 - Spiralbohrer mit Sichelanschliff 731170 - Bohrreibahle mit rundem Anschliff und Dia.HC Beschichtung

facts worth knowing About CFRP & GFRP-TOOLS

CUTTING GEOMETRY

Efficient machining of fibre composite plastics (FRP) requires cutting tools with special geometry. This depends on the respective FRP. The following elements are combined for an optimal tool:
- Many cutting edges during milling
- Sharp cutting edges
- Chip (fibre) crusher
- Special cutting geometry
- Special tip geometry

COATING

The fibres contained in the fibre plastic are abrasive and therefore quickly lead to tool wear, which in turn results in increased cutting forces.
The wear of the tool can be counteracted by a coating. Diamond coatings work best here.
As standard we offer two coating types: Diamond (smooth diamond coating with 10,000 HV hardness and coating thickness 4-10 µm) or Dia.HC (near diamond coating with 5,000 HV hardness and coating thickness 2-3 µm).

CHIP REMOVAL

With fibre plastics there is no chip formation in the classical sense. Flour is formed during machining. If this remains in the process, it is milled over and additional heat is generated. This can then damage the component by compressing it and leading to tool breakage.
Therefore, a tool with the correct geometry must be used and the flour must be extracted at the same time. In doing so, you should observe the requirements of occupational health and safety.

MACHINING STRATEGY

Fibre plastics consist of layers. This structure makes special demands on the drilling or milling process so that typical problems such as delamination do not occur.

- Sharp cutting
- High feed
- Good chip removal

Counter-rotating milling and circular milling are suitable strategies for drilling work.
 

HONEYCOMB TOOLS

In addition to tools for classical fiber materials such as GFRP/CFRP, we also have tool solutions for

for the processing of fillers such as foam or honeycomb composites.

 

Learn More

Our CFRP & GFRP-TOOLS

Find the right person to ask

Do you have a specific question?

Do you have questions about our products, would you like to be advised on our tools or make an appointment? Then please contact the appropriate contact person directly with your request. We will be happy to help you.

Of course, we also welcome suggestions, praise and criticism.

You can reach us either via the contact form below or quickly and conveniently by telephone or e-mail.

 

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