Tungsten carbide reamer is a type of rotary cutting tool used in metal working. Precision tungsten carbide reamers are designed to enlarge the size of a previously formed hole by a small amount but with a high degree of accuracy to leave smooth sides. There are also non-precision carbide reamers which are used for more basic enlargement of holes or for removing burrs. The process of enlarging the hole is called reaming. There are many different types of reamer and they may be designed for use as a hand tool or in a machine tool, such as a milling machine or drill press.

In this Article we will first talk about the construction of tungsten carbide reamers and then explain the different function of tungsten carbide reamers and drills in making holes to their sizes. And moreover, we will list the types of reamers accompanied with their respective features and functions, and at last ends with the applications of reamers. These types of reamers include adjustable hand reamer, straight reamer, hand reamer, machine reamer, rose reamer, shell reamer, tapered reamer, morse tapered reamer, combination reamer, and tapered reamer (non-precision) and at last end

(To be continued. This article is divided into several parts and this is part 1, for part 2 please refer to http://news.chinatungsten.com/en/tungsten-information/79457-ti-10166)

Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
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Besides graphite, copper, and Cu-based alloy, Cu-based composite material is also a kind of common materials of electrode.

3. Cu-based Composite Material

Cu-based composite electrode has good conductivity and thermo-plasticity and use air and water as medium, which usually for EDM or polishing. It is composed of 60%-65% solid carbon material (such as graphite powder, graphite slices or carbon nano-tubes and other mixture) distributes thermoplastic matrix and soften over and over again for molding. Compared with graphite and tungsten copper electrode, it has many advantages, like low cost, available for complicated shape and better efficiency, etc.

However, due to its density is much lower than tungsten copper, the electrical resistivity is higher and the wastage of electrode is increasing. This composite material is under development, which requires that low electrical resistivity, low coefficient of expansion, thermal cycling resistance, excellent conductivity and good dimensional stability in liquid.












 

More information about tungsten copper electrode and other materials comparison, click here:

http://news.chinatungsten.com/en/tungsten-information/79286-ti-10093 
http://news.chinatungsten.com/en/tungsten-information/79316-ti-10129 
http://news.chinatungsten.com/en/tungsten-information/79338-ti-10130 
http://news.chinatungsten.com/en/tungsten-information/79339-ti-10131 
http://news.chinatungsten.com/en/tungsten-information/79397-ti-10135 
http://news.chinatungsten.com/en/tungsten-information/79398-ti-10136

Tungsten Copper Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-copper.com/
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
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Besides graphite, copper, and Cu-based alloy, Cu-based composite material, diamond is also a common kind of material of electrode. However, due to the cost of diamond is much higher than graphite and the size is limited, there are some scientists do researches about that.

4. Diamond

CVD (Chemical Vapor Deposition) diamond, which mixed by carbon-containing gas and oxygen was excitation-decomposition under the low standard atmospheric pressure, and come into active diamond carbon atoms. They deposit at the matrix and grow up to polycrystalline diamond (or monocrystalline diamond, mono like diamond).

In order to make it have the same properties of tungsten copper (such as conductivity, electrical resistance), researchers add boron (B) during CVD, which has excellent adsorption to oil medium in electrical discharge machining (EDM). CVD diamond has high MRR (Material Removal Rate) and low wastage of electrode, especially it can work in high current density under certain condition, which Cu, graphite and tungsten copper is unavailable.

In addition, there is another kind of PCD (polycrystalline diamond), which has similarities with CVD diamond and its cost is lower than CVD diamond so that it is a kind of ideal material for electrode.

More information about tungsten copper electrode and other materials comparison, click here:

http://news.chinatungsten.com/en/tungsten-information/79286-ti-10093 
http://news.chinatungsten.com/en/tungsten-information/79316-ti-10129 
http://news.chinatungsten.com/en/tungsten-information/79338-ti-10130 
http://news.chinatungsten.com/en/tungsten-information/79339-ti-10131 
http://news.chinatungsten.com/en/tungsten-information/79397-ti-10135 
http://news.chinatungsten.com/en/tungsten-information/79398-ti-10136 
http://news.chinatungsten.com/en/tungsten-information/79428-ti-10137

Tungsten Copper Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-copper.com/
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
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Tungsten alloy can be used for bullets or pellets in various military applications such as pellets used inside a shotgun shell. Lead shot and bullets have been banned in many areas bullet head tungsten alloy military fittings.

Because of the environmental concerns. The main substitute materials are steel, bismuth and tungsten. The main advantages of tungsten military sphere that is used as pellet is that it is very dense, and very hard. The density allows the pellets to travel longer distances without loosing energy, while the hardness allows the pellets to keep their shape while being accelerated by the powder charge, which increases the muzzle velocity.

Tungsten alloy spheres are also used in hand grenade, armor piercing projectile, prefabricated fragments. Tungsten military sphere is small in volume and very dense. Allowing them to penetrate armor and damage targets. Tungsten alloy has been used in missile weapons, armor piercing ammunition, tungsten alloy bullet, shrapnel head, core for armor-piercing bullet measurement, kinetic energy penetrators, armor and shells.

Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn