JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 58

tooling

Diamonds advance composites drilling:
optimum tool design is critical
Carbon fibre reinforced polymers (CFRP), alone or
stacked with titanium and aluminium plates, are widely
used in the aerospace industry worldwide for their high
strength-to-weight ratio and stable material properties
in demanding environments. Boeing's Dreamliner 787, for
example, includes 80% composites by volume, equivalent
to 50% of its weight, eliminating 1,500 aluminium sheets
and up to 50,000 fasteners. This results in 20% better
fuel efficiency compared to the Boeing 767.

By

Fabian Rosenberger,
Sr. Engineer, Global Grade Development
Kennametal Shared Services GmbH

C

urrently, connecting technologies
such as gluing or welding are still
under question so that riveting is still
a dominating practice. Due to the substantially different mechanical properties of
carbon fibres and metals, drilling fastener
holes strongly challenges cutting tools as
high wear resistance and optimum tool
geometries are required.

Custom modular-tip drill
with brazed PCD insert
Compared with traditional tungsten-carbide cutting tools, polycrystalline diamond
(PCD) shows great potential for improving machining efficiency when machining
advanced aerospace materials. Brazed
PCD drills are being developed and offered by some leading metal cutting tool
manufacturers. Such tools use PCD cutting edges mounted onto a solid carbide
drill body. The carbide drill body provides
the rigidity and the dimensional accuracy
required to maintain hole quality, while
enabling spiral internal coolant holes and

helical flutes to improve cooling and chip
evacuation during drilling. The functional
cutting edges are PCD, which provides
the wear resistance required to enhance
machining efficiency.
Optimum tool design is critical to generate
good hole quality when machining advanced aerospace composites. In the tool
dimensional design process, several essential factors play an important role in the
resulting hole quality, such as sharper edge
radius and larger rake angle to generate

lower cutting forces. Other factors include
a smaller point angle to reduce thrust force
and fibre delamination, and optimized
edge design to improve burr height
control. Machine tools, spindle and setup
rigidity, tool adaptor, internal or flood
coolant, workpiece materials that the drill
enters and exits, are also important factors
to be considered during tool design. In
many cases, customized tools are required
to meet the customer's various needs in a
timely manner.

Tool development
Developing a premium PCD-enhanced
drill requires in-depth understanding of a
suitable synthesis approach. The process
development not only determines tool
performance, but also influences the tool's
manufacturing efficiency and cost.

Fig. 1: Custom modular tip drill with brazed PCD

58 jec composites magazine / No92 October - November 2014

There are four main technologies available
to produce synthetic diamond-based drills
for composite materials:
- CVD (chemical vapour deposition)
diamond-coated drills: A finished solid
carbide drill is coated with CVD diamond. It is a cost-effective solution, but



JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014

Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014

Cover
Edito
Point of view: oil & gas
Contents
COMPANY & BUSINESS In Brief
Recycling
Biocomposites
Spin-off
Agenda of Events
APPLICATIONS
Sustainability
Defense
Automotive
MARKET
Biocomposites
Inside the factory
SPECIAL JEC AMERICAS - FALL EDITION
Gain insight into the JEC 2014 I.C.S. Americas Program
JEC Americas Innovation Awards Program
Maintenance - Certified composite repair system for pipelines
Carbon fabrics - Successful first flight test for the VX-1 KittyHawk C-PlyTM aircraft model
Design - Composite aerostructure development in high-performance enterprises
RESEARCH & DEVELOPMENT
Reinforcement
Process
TECHNOLOGY & INNOVATIONS
NDT
Tooling
Infusion
Index
In the world
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Cover
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 2
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Edito
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Point of view: oil & gas
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 5
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Contents
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 7
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - COMPANY & BUSINESS In Brief
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Biocomposites
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Recycling
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Spin-off
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 12
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 13
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Agenda of Events
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Ad1
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Ad2
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 15
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Sustainability
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 17
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 18
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 19
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Defense
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 21
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Automotive
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Biocomposites
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 24
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 25
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 26
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 27
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Inside the factory
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 29
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 30
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - SPECIAL JEC AMERICAS - FALL EDITION
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Gain insight into the JEC 2014 I.C.S. Americas Program
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 33
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 34
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 35
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 36
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - JEC Americas Innovation Awards Program
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 38
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 39
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 40
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 41
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Maintenance - Certified composite repair system for pipelines
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Carbon fabrics - Successful first flight test for the VX-1 KittyHawk C-PlyTM aircraft model
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Design - Composite aerostructure development in high-performance enterprises
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 45
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 46
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Reinforcement
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 48
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 49
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 50
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Process
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 52
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 53
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 54
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - NDT
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 56
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 57
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Tooling
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 59
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 60
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 61
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Infusion
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 63
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 64
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - Index
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - In the world
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 67
JEC COMPOSITES MAGAZINE - Issue #92 - October/November 2014 - 68
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