INTELLIGENCE

IN GRAPHITE

www.gk-graphite.com

GRAPHITE MACHINED PARTS EDM SPARK EROSION.

BLACK MAGIC.GRAPHITE MACHINED PARTS IN SPARK EROSION - CUSTOMIZATIONS MADE OF GRAPHITE. Graphit Kropfmühl GmbH‘s operations around the world draw on more than 140 years of raw material experi-ence and competence. The company belongs to market-listed AMG Advanced Metallurgical Group N.V. and has established itself as a leading graphite specialist. On the basis of modern and quality-conscious processes and in intensive dialogue with our customers and partners, we develop premium special products in the areas of graphite powder, graphite dispersions and graphite machined parts. To ensure the raw material supply, we are involved with mines in Africa, Asia and Europe and benefit from a long-term relationship with Nippon Kornmeyer Carbon Group GmbH and their outstanding raw material qua-lities in the area of machined parts for EDM spark erosion. The graphite blocks are processed according to your individual requirements on state of the art machines at our headquarters in Kropfmühl near Passau, Germany. Thanks to efficient machining possibilities and permanent stocking of raw blocks, we are able to guarantee fle-xible and swift delivery times. Benefit from our long-standing experience as graphite specialist - we are happy to advise you!

EDM SPARK EROSION GRAPHITE QUALITIES

PropertyGK-200N GK-300N GK-500N GK-600N GK-700N GK-900N

Coarse Universal Fine Superfine

Average grain size [μm] 11 7 5 4 3 2

Ash content [%] 0.05 0.05 0.10 0.10 0.10 0.10

Density [g/cm3] 1.80 1.80 1.85 1.87 1.93 1.70

Hardness [shore] 57 60 83 68 83 75

Bending strength [MPa] 44 50 78 61 74 95

Spec. el. resistivity [μΩ-m] 12.5 13.0 18.0 14.5 15.0 17.5

Therm. expansion [K-1 x 10-6] 4.6 5.0 5.6 5.6 6.0 5.3

Therm. conductivity [W/mk] 116 105 70 90 90 not spec.

Max. block dimensions [mm] 350x630x1020 350x630x1020 350x630x1020 155x380x950 70x305x615 130x350x1000

The measurements are average values that may change slightly. Nippon Kornmeyer and GK are cooperating partners in EDM spark erosion Europe. Original producer of the graphite raw material blocks is Nippon Techno Carbon Co., Ltd. in Japan.

ACHIEVABLE SURFACE QUALITY

VDI 3400 12 15 18 21 24 27 30 33 36 39 42 45

Ra [μm] 0.40 0.56 0.80 1.12 1.60 2.24 3.15 4.50 6.30 9.00 12.50 18.00

GK-200N

GK-300N

GK-500N

GK-600N/700N

GK-900NThe achievable surface quality is an average value that may change slightly depending on each machine technology.

EDM SPARK EROSION

24 H CUSTOM CUTTING SERVICE

Sawed pre-cut parts ordered by 12 noon will be dispatched by express delivery on the same day.

PRODUCT RANGE Plates Customized plates and rods are available in your required dimensions, milled flat on one or both sides on request. This allows you to react swiftly and flexibly, saving on time and costs (cutting loss) in the pro- cess.

Rectangular rods Rectangular rods milled on all sides - with or without chamfer - suitable for all common holding systems. As off-the-peg or custom cut to your required lengths, available ex stock at any time.

Electrode box On request, we deliver pre-cut parts up 100 mm in length in a practical box made of stable EPS. One box contains 48 units with a 25 x 25 mm profile or 108 units with a 15 x 15 mm profile.

Head electrodes The shaft, which is milled on all sides, is produced according to your specifications in different lengths as well as with or without cham- fer for all common holding systems. The cut head allows you to design larger electrodes on this holding system. We are also happy to offer head electrodes with round heads.

Electrodes with drilling pattern Reduce time and material costs with customized electrode blanks! We supply you with electrode blanks with compatible drilling patterns for all common holding systems in your required dimensions.

Threaded electrodes Threaded electrodes without a drilling measuring 75 mm in length. Based on premium graphite quality GK-900N. Available in various thread sizes from M4 x 50 to M20 x 50.

EDM SPARK EROSION

OVERVIEW OF DRILLING PATTERNSD

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GK-ER01

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M6 M6

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100 mm

100

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GK-ER03M6 M6

M6 M6

x

y

TK 65 mm

120 m

m

120 mm

GK-ER04y

xM8 M8

M8 M8

GK-3R21 GK-3R22 GK-3R23yyy

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3 H7Ø M6

M6

M6M6

M6TK 40 m

m

7,5 mm 7,5 mm14,14 14,14

21 21

14,14

1

4,144 H7Ø

M6 M6

M6 M6

6 H7Ø 6 H7Ø

XY

Z

GK-11 GK-12 GK-13 GK-14 GK-15

GK-16

* Please indicate the diameter of the threaded hole(s) and the associated dimensions for the GK drilling patterns.

y y yyy

y

x x xx x

x

A A A A

B B B

C

GK-REF1 GK-REF2 GK-REF3 GK-REF4

13

1313 13 13x xxx

y yy y

M6 M6 M6 M6 M6

M6 M6

M6 M6

M6

30 6060

50

50

50

Slot

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Hea

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ode

GK-KGK-SCH

X

A

Z

y

X

y B

A

C

Fase 2x45°

Z=A+B

20,00 +0,00-0,50

Graphit Kropfmühl GmbH Langheinrichstr. 1 D-94051 Hauzenberg T: +49(0)8586 609-155 F: -112 formteile@gk-graphite.com www.gk-graphite.com

Member of VDWF Verband Deutscher Werkzeug- und Formenbauer

Official partner of

20 mm 20 mm

EDM SPARK EROSION