Diamond coated tungsten carbide cutting tools is one of coated tungsten carbide cutting tools which has incomparable superiority. Diamond coated tungsten carbide cutting tools has high hardness, low coefficient of friction, high thermal conductivity and low coefficient of thermal expansion. However, the diamond will work with the Periodic Table Group IVA to Group VIIA elements react, so diamond coated tungsten carbide cutting tools can only be used in machining the workpiece scrap metal and non-metallic materials.

Diamond coated tungsten carbide cutting tools has a small planar structure, which makes its surface rough. In the back of the tool, this facet will cause deterioration of the workpiece surface finish.

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The flutes of the tungsten carbide router bit refers to the deep helical grooves running up the bit. The quantity of the flutes is the number of the cutting edges that are made in the body of the bit. Since the cutting purposes and materials to be cut are varied, the flute is one of the geometry of the bit could make an effort in matching those specific cutting purposes.

Generally, the tungsten carbide router bits are available for one, two and three flutes (less commonly) , and more flutes increases the strength of the tool, but reduces space for chip flow. For example, one flute bit has more room for chips being evacuated, making faster cutting possible, while three flute bit is stronger and cuts with a finer finish.

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Tungsten carbide ball nose cutter is also called ball end mill as the end of its cutters are hemispherical, which could offer a radius to the inside corners of pocket cuts. It is a decent choice for machining 3D contoured shapes in machining centers, for instance, in moulds and dies. In 3D projects, it could help blend each path together, resulting in less finish work. When used to add a radius between perpendicular faces to reduce stress concentrations, it also function well.



There is also a term bull nose cutter, which refers to a cutter having a corner radius that is fairly large, although less than the spherical radius (half the cutter diameter) of a ball mill; for example, a 20-mm diameter cutter with a 2-mm radius corner. This usage is analogous to the term bull nose center referring to lathe centers with truncated cones; in both cases, the silhouette is essentially a rectangle with its corners truncated.


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A typical tungsten carbide router bit comprises cutting edge and shank, for its dimension the relevant data include, cutting edge diameter, cutting edge length , shank diameter and overall length.



Cutting edge diameter determines the width of the cutting tool will make through the work piece. The common measures of its dimension could be mm or inches.

Cutting edge length controls the maximum thickness of the work piece it can deal with. But it should be noticed that the cutting edge length has nothing to do with the length of the bit, which means even if the bit length is longer than the cutting edge length, the maximum cutting thickness is still equal to the cutting edge length.

Shank diameter is the diameter of the bit body where it goes into the collet. Sometime its dimension might be same with cutting edge diameter but not always.


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Overall length is the total length of the tungsten carbide router bit between the two ends. Specially, the bit will typically go into the collet 1 inches or more, so during the actual practice the length of the bit that actually out of the collet should be taken into consideration.  


Chip load refers to the thickness of a chip which is formed in the material machining processes. Chip load plays a vital part, as the proper chip size will remove the hear and promote long tool life. If the chip is too small, heat is transferred to the cutting tool causing premature bit failure. Too high of a chip load will cause poor edge finish, and transfer cutting load or thrust to the part, possibly causing it to move. And when a cut is finished, the recommended operation condition is room temperature .

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Precipitation method includes co-precipitation method and chemical precipitation method. Using precipitation method produce nano tungsten trioxide there will get a smaller powders particle diameter and more uniformity than using ammonium paratungstate producing tungsten trioxide powder. Prepared process as follows: First, mixing 1ml / L of Na2WO4 solution and Na2SnO4 solution then dropped this solution into boiling dilute H2SO4 with slowly, in this process should stirring constantly. Then aging, washing, filtering, drying and calcining to obtain SnO2-WO3 gas sensing powder materials. When doped 5% SnO2 additive can inhibit WO3 crystal grains to the growth and also can increase its gas sensing degree. Using chemical precipitation method to produce nano tungsten trioxide there is the process: Firstly, weighed 3.0g Na2WO3 and 0.005g one hundred and sixty thousand trimethyl ammonium bromides (CTAB) then make them dissolved in 10ml of distilled water. Then take 3ml solution dropwise adding to 5ml 3mol • HCL L-1with slowly. The solution was stirred for 1 to 2 hours after centrifugation the precipitate. With distilled water and acetone repeatedly washed it, and the resulting precipitate was placed in an oven at 80 ℃ dried to obtain precursor. Finally, the precursor was placed 300 ℃ muffle furnace, to obtain a nano tungsten trioxide.

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When people find tungsten trioxide film material has electrochromic properties, then they carried out extensive studies at electrochromic, photochromic Gaschromic discoloration film, and powder preparation and so on. What’s more it has achieved many fruitful results. Electrochromic material refers to a specific material be applied at a certain voltage and electric filed, the material’s color or transmittance will cause reversibly changes phenomenon. Amorphous tungsten trioxide film having high coloring efficiency, good reversibility, short response time, long useful life, low cost, coloring and fading ‘s optical change range wide and other advantages so it is considered to be the one of most promising electroluminescent material. WO3 electrochromic process is generally represented by the following formula: WO3 (transparent) + x (M ++ e-) ← → MxW6 + (1-x) W5 + xO3 (blue). The M + = H +, Li +, Na +, 0 <x≤1, e- is an electron. When the electron and ion implant into transparent WO3 film, the film was blue. When the ions and electrons are extracted, transparent films returns to its original state. This is due to partly +6valence of W6 + is reduced to +5 valence of + W5 which produce tungsten bronze MxWO3.

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Due to its high density, excellent absorption behaviour against radiation and environmental friendly characteristics, tungsten alloy can be widely used in radiosurgery tungsten alloy shielding.Radiosurgery is surgery using radiation,that is the destruction of precisely selected areas of tissue using ionizing radiation with tungsten alloy shielding rather than excision with a blade.

Radiosurgery tungsten alloy shielding is usually used to treat cancer.Radiosurgery tungsten alloy shielding is usually in stereotactic radiosurgery (SRS), the wordstereotactic refers to a three-dimensional coordinate system that enables accurate correlation of a virtual target seen in the patient's diagnostic images with the actual target position in the patient anatomy.

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Neutron radiation is a kind of ionizing radiation which consists of free neutrons. A result of nuclear fission or nuclear fusion, it consists of the release of free neutrons from atoms, and these free neutrons react with nuclei of other atoms to form new isotopes, which in turn may produce radiation.

Due to its high density, excellent absorption behaviour against radiation and environmental friendly characteristics, tungsten alloy can be widely used produce neutron tungsten radiation shielding. Neutron tungsten radiation shielding can be used in select facilities to treat cancerous tumors and damaging nature to cellular structure. Neutron tungsten radiation shielding can also be used in the nuclear industry, the space and aerospace industry, as well as the high reliability explosives industry.

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Non-sag tungsten wire with poor diameter consistency will lead to poor photoelectric parameter of incandescent bulbs, and some will affect the life of the lamp. Non-sag tungsten wire can used for the production of incandescent lamps filament and tungsten halogen lamps filament, and gas discharge lamp filament electrodes, a small number of non-sag tungsten wire is applied to high-temperature furnace for heating materials, tube heater and the composite material stiffener. Use as a gas discharge lamp cathode, in order to reduce the electron work function, should add 0.5 to 3% of thorium, called thorium tungsten wire, to non-sag tungsten wire or tungsten rods. Because Thorium is a radioactive element, and can pollute the environment, cerium rather than thorium is used for making tungsten cerium wire or tungsten cerium rod. But the evaporation rate of cerium is high, tungsten cerium wire or tungsten cerium rod can only be applied in small-power discharge lamp. Tungsten becomes very brittle by high temperature recrystallization, and it can easily break in case of a shock or vibration. In some of the requirements of high reliability electric lighting products, in order to prevent wire breakage, we often add 3 to 5% of rhenium, called tungsten-rhenium wire, to non-sag tungsten wire, which can make the extension of tungsten brittle transition temperature drops to room temperature or below. This is a very strange effect of rhenium, has not yet been able to find a substitute element to produce the same effect. At room temperature, tungsten has good acid and alkali capacity, but in the humid air it is easily oxidized, so fine tungsten wire can not be stored for too long in a humid environment. Besides, tungsten begin to react with carbon at 1200 ℃ and down, so we should pay attention to this issue when we are burning hydrogen treatment of filament, or graphite lubricant will react with tungsten and the wire would become brittle fracture.

 

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