Molybdenum is an element that shares many properties with tungsten. Like tungsten, it is very hard and has a very high melting point. Unlike tungsten, it has greater ductility and a lower density. In EDM, the similarities between molybdenum alloys and tungsten alloys result in a great amount of overlapping applications.
- Properties are similar to those of tungsten and its alloys.
- Molybdenum EDM Wire and Molybdenum EDM Electrodes are available in rods and tubes.
- Low carbon arc cast (LCAC) molybdenum is available.
- LCAC molybdenum is 99.97% pure, with a maximum carbon content of .01%.
In Europe and USA are 98% of all sold wire EDM machines based on cupper/brass wire. In Asia, more than 60 % of the machines sold till now are based on the principle of reciprocating molybenium wire principe (jig-saw movement). The wire cost of our Novicut-M-II range is till 70% lower as a standard Cu/brass wire cutting machine.
Proven technology of reusable molybdenum wire brought to the precision standards of today. With the design of the new wire-guides and the patented zirconium drive wheels, Novick succeeded to reach with a machine of half price of the copper/brass wire cutting machines, the level that is suitable for 98% of all parts: Ra<= 0.8µm and precision of +- 4µm
The new generator in combination with the new patented guiding system, and supported by the 4 step wire speed, has improved drastically the precision and the surface quality of the finished parts and this with a speed increase of around 40%.
With the Novicut 350M-II, you reach already a better surface roughness than Ra 1.0µm after three-cuts!
Wire EDM Electrical Discharge Machining Machine Materials:
Our novicut M series can cut besdie all standard conductive materials also very easily following super hard and super tough materials:
Ti alloy, Titanium alloy, stainless steel, high alloy steel, Kovar steel, Inconel steel, carbon steel, exotic metal, Hastelloy, Ferro-tic, Stellite, Nitronic, Beryllium-copper alloy, Tungsten carbide, Nitralloy, Waspaloy, Nimonic, harden toolsteel. PCD, etc
Material: D2 Tool Steel | 1.2379 | X153CrMo12 | SKD11
Cold Works D2 tool steel is a high carbon, high chromium tool steel (12% chrome) with extremely high wear resisting properties, heat treatable to 60-62 Rc
Electrode : Wire of 0.18mm, Molybdenium wire 99.8%
- Average Surface roughness : Ra = 0.76 µm
- Pitch accuracy : 14µm
- Shape accuracy : 9 µm
- Multi-cutting function 4 cuts
- Best roughness Ra < 0.68 µm
- Worst Roughness Ra < 0.78 µm
- Max. cutting speed hit 315mm2/min at highest wire speed at first cut.
With the new advanced and patented pulse power eco generator specific for molybdenum we get much lower loss of wire (electrode wear). The diameter of a 0.18 mm wire, reduced with 0,007mm in 200.000 mm2 cutting (5 shifts of 8 hour working). This keeps the precision of the each cut at the lowest cost available!
Using molybdenum wire cutting machines offers much more advantages than disadvantages. When you can accept the few limitations of moly wire cutting and your workpieces are within the tolerances reachable of our machines, then our Noviform-M series offers you an economical very interesting high functional tool able to make high quality parts and save tremendous money in production cost.
This molybdenum wire is mostly used in the fixed diameter of 0.18mm(+- 0.003mm) to meet blueprint requirements of narrow kerfs and near-sharp, inside corner radii. This 0.18mm gives a perfect balance between lifetime, cutting speed, cutting tolerances and surface quality. Because of it’s high tensile strength, moly wire aids in maintaining excellent wall straightness and reducing the number of wire-breaks common with many copper or brass wires. In special cases, typically in medical and military applications, there can be no copper or zinc contamination of the wire cut surface. These criteria eliminate all copper-family wires and forces the use of a moly or tungsten wire.
Contradictious to copper (tensile strength 200-250N/mm²) or brass wires (soft brass 375 N/mm² and hard brass 1180 N/mm2), molybdenum wire is a very high strength wire (tensile strength 1724 N/mm2). Molybdenum wire resist to very high pulling forces and breaking it is very difficult. This gives a triple advantage:
- much less wire breakage due to much higher pulling resistance
- Almost no elongation (<2%) of the wire during cutting
- Higher pulling force guarantees also straighter cuts in the sense that the wire resists much better to side-forces and is less bending or get less deviated in corner movements. This allows it to cut very fine, very straight-walled details with sharp definition. The harder pulled, the straighter the wire stays during cutting.
- Due to the higher pulling forces possible, we can increase the move through speeds of the cutting wire remarkable and can make a much faster cutting (our machines have standard 4 wire feed speeds) .
Because moly wire has very high melting temperature, (2,625°C), compared to copper (1085°C) and brass (900-940°C), the molybdenum wire EDM cutting machine can handle very high working temperatures. As result of this high temperature resistance almost all conductive materials, most difficult, hardest and toughest, can be cut with our Novicut-M. Most of the materials are melting much faster than molybdenum and even normal steels can be cut faster as we handle more electric spark power per second and per mm wire than normal wire. By using patented zirconium guide wheels, we could increase drastically the cutting current and also the cutting speed.
One disadvantage of this high temperature resistance is that the spark craters made in the wire are much smaller than the ones made in the workpiece. As results the burned away carbonized particles between wire and workpiece are more difficult pulled out of the cutting area by the smaller craters in the wire. For this Novick developed a drum with 4 speeds, so that the moly wire can move through the metal with a much higher speed and takes much more carbonized particle with him. Good Flushing with a slightly longer retract time is here the solution.
The EDM spark craters left on the wire’s surface are very small compared to those left on the workpiece that is cut. So, the wire is almost not damaged after passing through the material and this results in a much longer of reuse the wire. Lifetime of the molybdenum wire can reach sometimes weeks. On the other side the sparking result on the workpiece are much bigger and gives a better and faster cutting results. The removable rate can be very high if the flushing is under control.