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ELKANITE 100W RECOMMENDED MACHINING CONDITIONS

 When machining tungsten it has to be taken into account that tungsten is brittle at ambient temperature. Only when heated to the so-called “brittle-to-ductile transition temperature” does it become ductile.  This transition temperature depends upon the purity and the previous deformation history of the metal and lies between 100 and 300 degrees C.  It is therefore recommended to heat especially thick-walled workpieces to 2000C prior to machining.

 

DRILLING

Cemented carbide grade l.S.O. K01

Nose angle 118-120 degrees.

Clearance angle at main cutting edge 12 degrees.

Clearance angle at circumference 10 degrees.

Cutting speed v = 12-18m/minute.

Drilling dry or cooling with highly chlorinated cutting oils.  (See note 1)

 

TURNING

Straight turning tools made of cemented carbide grade l.S.O. K01.

Side rake 0-5 degrees approx.

Clearance angle 8-10 degrees.

Nose angle 90 degrees.

Nose radius 0.8-1.2mm.

Feed 1 = 0.2-0.35mm.

Cutting speed v = 100-120 m/minute (See note 2)

Coolant: emulsion.

It is recommended to warm pieces of larger wall thickness and higher deformation to 200 degrees C before or during turning

 

MILLING

Cemented carbides grade l.S.O. K10 and K01.

Side rake 10 degrees.

Clearance angle 8 degrees.

Nose angle 90 degrees.

Nose radius 0.3mm.

Feed 1 = 0.3mm.

Depth of cut a = 2 mm.

Cutting speed v = 20-30 m/minute.

Milling dry.

The milling heads should be sharpened by diamond grinding wheels with particle size D 70.

 

PLANING

Cemented carbide grade l.S.O. K01.

Same tool geometry as for TURNING.

Cutting speed v = 10 to 25 m/minute.

Planing dry.

Tungsten should be planed from both sides.

Prior or during planing it should be heated to 200 degrees C.

 

GRINDING

Abrasive silicon carbide wheels, hardness H, l, J and K, particle size 60-120, with average

structure and ceramic binder.

Depth of cut a = max. 0.02mm.

Grinding speed v = max. 1800 m/minute.

Cooling with aqueous emulsions.

 

 

SPARK EROSION

Electrode material (WCu) Elkanite 20W3.

Polarity of electrode: negative

 

 

Roughing

 

Smoothing

 

Current

36A

 

12A

 

Voltage

100V

 

100V

 

t/micro seconds

20

 

2

 

 

 

 

 

 

Volumetric wear

 

20-30%

 

 

 

 

 

 

NOTE 1

When using highly-chlorinated lubricants such as trichloroethyleno, carbontetrachloride, etc. safety regulations must be observed.

  

NOTE 2

When turning Tungsten to smaller diameters than 5mm it is recommended to reduce the cutting speed to 20-45 m/minute.

 

 

All Mallory Alloys Group products conform to, if not exceed, the relevant standards as assured by the Quality Management System Quality Management System - ISO 9002, EN 29002, BS5750-2


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