Wire cutting
When wire cutting processing, the hair-like thin line is a kind of consumable made of molybdenum and other precious metals. Wire cutting is divided into fast wire (with molybdenum wire) and slow wire (with copper wire).
Molybdenum wire can not only process all kinds of metals, but also widely used in winding core wire, lead wire, heating elements, etc. Molybdenum wire has high precision requirements, low wire breaking rate, fast processing speed, and can realize stable and long time continuous processing.
When I saw the wire cutting processing, for a long time, I always thought it was molybdenum wire and the workpiece hard, live was sawed off, don't laugh, really think so, in fact, the real cutting principle with my imagination of the difference of one hundred and eighty thousand li.
Wire cutting is the use of continuous moving fine metal wire as electrode, pulse spark discharge on the workpiece metal erosion, cutting molding.
In popular terms, this wire is energized, still keep walking, discharge on the workpiece, instantaneous several thousand degrees of high temperature, the part of the discharge melting or gasification, so cut, note: not hard cut, not the metal wire itself to produce high temperature to cut, but discharge, let the workpiece produce high temperature, melting and corrosion.
The main component of molybdenum wire is molybdenum (Mo), the content is more than 99%, molybdenum in nature mainly exists in molybdenite (MoS2).
For a long time molybdenite was known as graphite, this soft gray mineral, and in the 18th century it was proposed by Scheele that molybdenite itself was not a graphite, but a metal ore. He also tried to reduce the pure metal molybdenum, but the furnace could not reach the required temperature, and many years later it was succeeded by Haykilm in reducing the silver metal molybdenum.
Molybdenum is a silver-white hard metal with high melting point and good ductility. Its melting point can reach 2620 degrees Celsius, and its boiling point is 4639 degrees Celsius. Among the natural elements, only tantalum, osmium, rhenium, tungsten and carbon have melting points higher than molybdenum, which can still maintain a certain hardness even if it is burned red. Molybdenum is also chemically stable and will not be corroded by hydrochloric acid or alkali.
The metal molybdenum is very similar to tungsten in appearance, but it is easily distinguishable by its density, which is only half that of tungsten.
The metal molybdenum is very stable at room temperature. When the molybdenum rod is heated in the air, the molybdenum will be oxidized quickly when the temperature rises, resulting in yellow molybdenum trioxide (MoO3). With the different thickness of molybdenum oxide, it will also show colorful colors. Molybdenum trioxide can be used to produce ammonium molybdate, an important chemical product of molybdenum. It is the raw material for the manufacture of ceramic glazes, pigments and other molybdenum compounds.
Molybdenum is a rare metal on the earth, we are unfamiliar with it and familiar with it, it is closely related to our lives, the application is very wide, it is used in the national defense industry in the strategic metal, is an important nutrient element needed by animals and plants, or an important component of steel alloy.
At present, more than 80% of the molybdenum produced in the world is used in iron and steel smelting, mainly used as an additive for the production of alloy steel, which can improve the strength, toughness and wear resistance of alloy steel. Because of its good mechanical stability and high ductility, it is used in high heating elements (molybdenum is the hook material for hanging tungsten wire in light bulbs), extrusion molds, metal processing tools, Aerospace and spacecraft parts, etc.
