Wooden dartboards are made from end grain pieces of basswood.

Wooden dartboard comes in two sections, a center section which is a circular area that includes the blue rings, and an outside "frame" area. The center section will rotate, although it usually takes a bit of elbow grease at first.

Since the same innings are often used over and over, wooden dartboard wears unevenly, to prevent that, you can rotate it which will let dartboard get as much life as possible.

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Triangle dartboard is not refers to the shape of the board, but that the shape of the wire. Many types of dartboards are with circle wires, while triangle dartboard are with triangle shape iron wire, which greatly reduces the risk of darts bounce outs by wire.

Many important champions such as world darts championships adopt the triangle dart board.

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More than 500 years ago, dart spent a long time to development.the United Kingdom soldiers who had been ejected in battlefield, it was competing with the bow and arrow was a weapon aiming at a specific target in the battle of leisure has been said that it is roots you.

Then, they throw using only arrow without a bow, target also changes to what was a large tree in round slices, it went a current form. Then it spreads around the world, and led to dart development to boom of today is transmitted to Japan.

Darts, unlike normal sport (competition), rather than the addition competition basically, it is subtracted competition. Therefore, you can feed the judgment that thought of computational power and earlier. Mental target competition, strengthening of the autonomic nervous, concentration sustained enhancement, in addition to the stimulus to the cerebral cortex, because the competition that you respect the manners, such as manners of discipline is attached to the body, the youth as Education and Sports. If there is a wide range of improvements and utility stood, we come to be recommended.

In addition, upon the aging society, and that the momentum is not so many, improvement of physical function, as rehabilitation and blur prevention, including the recovery effect, now not only the competition purposes, as education and lifelong sports, both young and old making it familiar.

More than 500 years ago, dart spent a long time to development.the United Kingdom soldiers who had been ejected in battlefield, it was competing with the bow and arrow was a weapon aiming at a specific target in the battle of leisure has been said that it is roots you.

Then, they throw using only arrow without a bow, target also changes to what was a large tree in round slices, it went a current form. Then it spreads around the world, and led to dart development to boom of today is transmitted to Japan.

Darts, unlike normal sport (competition), rather than the addition competition basically, it is subtracted competition. Therefore, you can feed the judgment that thought of computational power and earlier. Mental target competition, strengthening of the autonomic nervous, concentration sustained enhancement, in addition to the stimulus to the cerebral cortex, because the competition that you respect the manners, such as manners of discipline is attached to the body, the youth as Education and Sports. If there is a wide range of improvements and utility stood, we come to be recommended.

In addition, upon the aging society, and that the momentum is not so many, improvement of physical function, as rehabilitation and blur prevention, including the recovery effect, now not only the competition purposes, as education and lifelong sports, both young and old making it familiar.

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Separation of tungsten and molybdenum in production process of ammonium paratungstate is important working procedure ,but this is always one of difficult technical problems .General flows of various ammonium paratungstate technologies and basic nature of molybdenum were summarized .Moreover advantages and disadvantages of each separation method for tungsten and molybdenum in production process of ammonium paratungstate were systemarically analyzed .A nalysis results indicated that there many advantages , such as short process folw small tungsten loss, good molybdenum eliminating effect, simplicity of operation,low environmental pollution and economy feasibility to eliminate molybdenum by ion-exchange method . It is precisely because of these advantages, ion-exchange method to eliminate molybdenum has a good industrial application prospect.

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By evaporating and neutralizing of two ammonium tungstate with different density ,crystals of ammonium paratungstate (NH1)10W12O11·Nh2o(n=11,7,5)were prepared with ultrasonic .UsingXRD,DTG and granularity analysis, the crystalline form was confirmed and researched .The results proved that the effect of ultrasonic on ammonium tungstate was in evidence .The crystalline forms were the same with ultrasonic and without ultrasonic, but impure apexes on the XRD patterns were less and value of d/A more tallied with literature with ultrasonic . Distributing of crystalline granularity became narrower and the crystal was more homogeneous. Ultrasonic shortened the formation time nucleus of crystal .

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Ammonia in APT crystal mother liquor was removed by adding sodium tungstate with sodium hydroxide and magnesium salts. The results show that the content of ammonia in the treated solution can be removed down to 0.042g/L up to 98.8 ％ removal rate. The resultant sodium tungstate solution was diluted 10 times befote prepared as ion exchange feed solution., the content of ammonia in the raffinate is less than 0.0005％, which can meet China national discharge standard .

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A refractory metal tungsten carbide hard metal compound and a binder made by powder metallurgy method, its hardness (HRA) is 89 to 94, much higher than the high-speed steel; at 540 ℃ hardness (HRA) 82 to 87, and the hardness of high-speed steel normal temperature (HRA83 ~ 86) fairly, but also has good chemical stability, heat resistance advantages. Tool materials currently used for a lot of variety though, the new tool materials are also emerging, but still very popular tungsten carbide tool material kind.

In order to prevent the material as a result of crack propagation due to the failure, and is favorable for obtaining a high-performance tungsten carbide cutting tools material may gradient processing, the surface area of the coated substrate formed lack toughness cubic tungsten carbides and carbonitrides of region, this region is higher than the binder content of the nominal binder content of the coating substrate; when a crack is formed in the coating extended over the area, because of their toughness, crack propagation can absorb the energy, it is possible to effectively tungsten carbide cutting tools to prevent cracks internal expansion, improve the performance of tungsten carbide cutting tools.




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The extremely sharp and smooth enough neat cutting edge machining to have a specific, smooth shape, and edge rounding mostly waterfall edge, this process is called edge passivation. tungsten carbide cutting tool edge passivation change the contours of the cutting edge and morphology, but also to improve the microstructure of the blade surface area, thereby affecting the cutting process, tool performance and workpiece quality. tungsten carbide cutting tool edge passivation impact, affecting mainly the following aspects: the distribution of cutting temperature, the size distribution of cutting force, stress and strain, and chip formation and chip flow, deformation region of the workpiece, the workpiece surface integrity (residual stress), the machined surface roughness, surface hardening process and tool wear resistance.

Edge passivation tungsten carbide cutting tools for working efficiency has an important role in the following cases generally require the tool edge passivation:
1. The new sharpening of tungsten carbide cutting tools or regrinding of tungsten carbide cutting tools.
2. Prior to the tungsten carbide coating.
3. When the impact of heavy-duty cutting or cutting edge tungsten carbide cutting tools needed to passivation.




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High quality tungsten alloy penetrator is an important symbol of national materials technology development, but also an important material for high performance kinetic energy penetrators, which will be related to the development of standards to improve our standard of weapons and equipment needed can win a local war.

To this end, it should address some of the issues and the actual needs of the existing one hand, vigorously strengthen the management and coordination of military material development project, on the other hand should further improve the scientific management level of research institutes and universities to form a kind of systematic and highly complementary mechanism, and created a high standard of professional research team, in order to promote China's missile tungsten alloy materials technology to develop low-input, high output, high standards and high availability of direction. And should strive to achieve a breakthrough in the short term in some key technologies in order to be able to significantly improve the overall performance of armor-piercing tungsten alloy material.




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