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Tungsten Carbide Ball Bearing II

Details: Category: Tungsten Information; Published on Friday, 18 September 2015 16:37; Written by xiaobin; Hits: 504

There are twomain sections of tungsten carbide ball bearing, one is ball bearings with integral shafts, the other is specifically divided into thrust bearings, linear bearings, angular contact bearings and the most common ball bearing, the radial bearing.

1. Tungsten Carbide Ball Bearings with Integral Shafts

The integral shaft or “water pump spindle bearing” was originally designed as a support bearing for use in automotive engine cooling systems. Due to its versatile design, this bearing can also be used in fans, vane pumps and washing machines. Integral shaft bearings are generally double row ball bearings (two sets of balls) comprised of an outer race with two ball tracks or raceways and an inner “race” that is machined directly into the surface of an internal shaft. They do not have an inner ring like conventional double row ball bearings. As the name suggests, an “integral shaft ball bearing” is simply tungsten carbide ball bearing with a shaft that is an integral part of the bearing, i.e., the shaft cannot be removed without disassembling or otherwise destroying the bearing.
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Tungsten Carbide Ball Bearing

Details: Category: Tungsten Information; Published on Friday, 18 September 2015 16:31; Written by xiaobin; Hits: 384

Tungsten carbide ball bearing is one of two types of rolling bearings, the other being a roller bearing. The purpose of tungsten carbide ball bearing is to reduce friction and to support radial and axial loads. There are four main parts of a ball bearing: two grooved, ring-like races or tracks (inner and outer ring), a number of hardened steel balls and a cage to space, separate and guide the balls. The inner race is the smaller of the two races and fits inside the larger outer race. The balls fill the space between the two races and allow the bearing to rotate smoothly within the grooves.

Tungsten carbide ball bearings come in all shapes, sizes and materials and are by far the most common bearing used. They are a required component in many industrial, residential and commercial applications and play an important role in everyday life. These bearings are used in a wide range of products including heavy industrial equipment, such as steel rolling mills, washing machines and personal computer hard drives. Some of their not so common uses are in military aircraft and oil drilling equipment.
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Tungsten Penetrator

Details: Category: Tungsten Information; Published on Friday, 18 September 2015 16:20; Written by yanna; Hits: 330

Numerous types of penetrators exist. Tungsten is often a material of choice in the penetrator art. A typical method for fabricating penetrators from tungsten involves the use of tungsten powder metal, which is a heterogeneous mixture of tungsten and other metal powders. The mixture of powders is compacted into the desirable shape, liquid phase sintered and processed into penetrators.

Tungsten penetrator has superior, sought after properties. It may be produced by employing metal matrix composite technology. The tungsten penetrator herein differs from other penetrators in the prior art in that it is composed of tungsten whiskers. Although different crystalline orientations of tungsten whiskers may be employed within the scope of the present invention, the orientation is the one preferred.

Tungsten penetrators already in use tend to form mushroom heads upon impact of a hard target. The formation of a mushroom head decreases the penetration ability of a penetrator. Hence, the performance of a penetrator would be enhanced if the formation of a mushroom head could be eliminated.

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Tungsten Alloy Military Spheres Applications

Details: Category: Tungsten Information; Published on Friday, 18 September 2015 16:26; Written by yanna; Hits: 348

With the highest density weighting in at 1.7 times heavier than lead, tungsten alloy is the best ideal material for military defense used in military. On the one hand, tungsten is non-toxic, so it is the related product for lead which was used in bullet and shot to reduce the environmental hazardous materials in the military field. On the other hand owing to its great hardness and resistance to high temperature, tungsten alloy sphere has been applied in military defense increasingly today.

Tungsten alloy sphere can be also used as bullets or pellets in many military filed, the main advantages of tungsten alloy balls which made as pellet are that it's very dense, and very hard. The density allows the pellets to fly long distances without slowing down, while the hardness allows the pellets to keep their shape while being accelerated by the powder charge, which increases the muzzle velocity.

As well tungsten alloy spheres are widely used in hand grenade, armor piercing projectile, prefabricated fragments, tungsten alloy sphere is in small volume with high density, which means it could be used in some fields need the little but heavy parts, such as counterweights for military defense, projectiles in the missile weapons, armor piercing ammunition, hunting equipment, armor piercing ammunition，tungsten alloy bullet.

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Introduction to Tungsten Carbide Tipped Reamers Ⅱ

Details: Category: Tungsten Information; Published on Thursday, 17 September 2015 17:33; Written by zhihua; Hits: 339

(This article is divided into two parts and this is Part Ⅱ. For Part Ⅰ please refer to http://news.chinatungsten.com/en/tungsten-information/78698-ti-10017)

Types Of Tungsten Carbide Tipped Reamers

Reamers can be firstly classified by the number of flutes. Tungsten carbide-tipped roughing reamers may have either an even or an odd number of flutes, depending upon the reamer size and the application. Standard and finishing types usually have an even number of flutes. The spacing of the flutes around the reamer body is sometimes uneven to minimize the possibility of chatter.

Tungsten carbide tipped reamers may be made for either right- or left-hand flutes, or with straight flutes, and may incorporate one, two, or more sections of different diameters for cutting two or more diameters in one operation. Carbide tipped reamers in straight flute design, with strips of tungsten carbide the full length of the flutes, are ideal for precision reaming to close tolerances. The wear on the diameter from bushings is eliminated and back taper can be reduced to a minimum, as danger of pickup on the diameter is reduced.

Solid carbide reamers are more practical in small sizes because of their rigidity, heat resistance, and strength. Tipped reamers in small sizes below ¼ inch are very fragile because of the removal of steel necessary to install the tip. Also, the rapid absorption of heat causes brazing failures in dry operation.

Maintenance

For best efficiency, carbide-tipped reamers house be used only on machines that are in good condition. Loose or misaligned spindles can cause serious damage to a reamer, and the resulting cut will not conform to the desired size or finish.The magnitude of lead and rake angles, width of land, amount of clearance, and whether straight or spiral flutes should be employed are all related to the kind and characteristics of the material in the work piece.

Carbide tipped reamers are generally covered with a plastic coating over the tips for the protection of the cutting edges. This coating may be removed in such a matter that it can be replaced when the tool is not in use. The coolant or lubricant, when used, should be in abundant supply and should wash over the tool at all times to avoid cracking of the carbide from overheating and quenching.

Grinding Suggestions

Reamers should be sharpened as soon as they become dull enough to prevent proper cutting. It usually is necessary to sharpen only the cutting edge or the chamfer, but if it is necessary to regrind the diameter, the correct circular-land width must be maintained, as well as the back taper.Carbide tipped reamers may be reground on a standard cutter grinder with a 220-grit resinoid-bonded diamond cup wheel. The grinding wheel should be rotated in a direction to cut from the face of the tip toward its back (Fig 3-57). The use of a lubricant during grinding lengthens grinding wheel life and lessens the danger of a surface cracking or “crazing” of the carbide from overheating. Do not quench carbide tools in water.

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