Cutting tools currently in use and including carbide for cutting relatively hard metal stock combine a steel shank with a relatively small carbide cutting tip brazed to one end of the steel shank. This construction has exhibited several serious shortcomings. For example, the heat of brazing apparently changes the temper or grade of the carbide and may cause the carbide to crack. Further, brazing provides somewhat of a weak joint between the two materials, this permitting the carbide to vibrate, which may result in chipping. Also, manufacturing the cutting tool in two parts and then joining those two parts together in a brazing operation drives the cost of the device up and provides a greater chance of error in the finished product.

A further disadvantage of the two-piece carbide tip, steel shaft construction is the limited life of the cutting tool. This limited life may result in a variety of ways. First, the carbide tip can only be trimmed back approximately 1/2 inch and this inherently limits its cutting capabilities. Second, the brazing joint may fail and thereby enable the carbide insert to break away from the shaft. Third, the shaft portion supporting the insert may completely shear or seriously bend. All three of these conditions render the cutting tool inoperable and risk the danger of the steel shank tearing against the metal stock, thereby causing serious damage to the stock.


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The great performance of Tennis racket with tungsten alloy counterweight parts is reflected in high density, high tensile strength and hardness, good corrosion resistance and oxidation resistance, good mechanical properties, etc. High density is a prominent performance of tungsten alloy counterweight, the density of tungsten alloy is generally 16.5 ~ 18.6.0 g/cm ^ 3, which is more than twice that of steel density, at the same time in the increase of the weight of the volume to a minimum extent, that greatly improve the tungsten alloy counterweight design flexibility.

Environmental friendly performance is another important advantage of balancing tungsten alloy tennis racket.Tungsten alloy counterweight material has good corrosion resistance and oxidation resistance, will not cause harm to environment and human nature.It has a strict requirements on sports equipment.

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The connecting rod to the light displacer comprises, and is preferably formed from, a high density material of at least about 15 grams such that the connecting rod is heavier than the displacer alone. Such a heavy connecting rod provides the required reciprocating mass to match the reciprocating mass of the compressor piston, and the wobbling of such a heavy mass does not result in a significant undesirable vibration. The connecting rod can be more than three times the weight of the displacer.

Heavy connecting rod is provided by forming the rod of a tungsten alloy which has a density of 17 grams per cubic centimeter. Tungsten is particularly desirable for use in the connecting rod because it has a density of greater than 15 grams per centimeter, is machinable and has the strength required for a driving element.

In a specific embodiment, the compressor piston is about 22 grams and the displacer is only about 4 grams. By using a heavy tungsten connecting rod which is 18 grams, the total weight of the displacer assembly can be made to match the weight of the compressor piston.

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In an integral Stirling cryogenic refrigerator the compressor piston is several times heavier than the displacer. In order to counterbalance both the displacer and compressor piston with a rotating counterweight, the displacer connecting rod is formed of a high density material. Specifically, the connecting rod is formed of a tungsten alloy and is several times heavier than the displacer.

A cryogenic refrigerator comprising a rotary drive shaft, a reciprocating compressor piston assembly including a compressor piston driven along a first axis by the drive shaft through a drive eccentric, a reciprocating displacer driven along a second axis, angled about 90 degrees from the first axis, by the drive shaft through said drive eccentric and a displacer connecting rod, and an eccentric counterweight mounted to the drive shaft with a center of gravity about 180 degrees about the drive shaft from the drive eccentric center, the displacer connecting rod having a pivotal connection to each of the displacer and the drive eccentric such that it has a wobbling motion as it drives the displacer, wherein the weight of the compressor piston is substantially greater than the weight of the displacer, the displacer connecting rod comprises high density material such that the weight of the connecting rod is greater than the weight of the displacer, the combined weight of the displacer and connecting rod is about the same as the weight of the compressor piston assembly, and the weight of the counterweight is such that it substantially balances the rotating drive eccentric and the reciprocating compressor piston assembly, displacer connecting rod and displacer in the first harmonic.

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For more than 50 years, makers of golf clubs have referred to clubs with a higher percentage of their overall weight concentrated in their heads as having greater so-called "swingweight". Swingweight is a measure of a club's moment of weight about an arbitrary axis, with the axis being located either 14 inches or 12 inches (Official Scale) from the butt end of the shaft.

To use tungsten alloy counterweights simultaneously as frictionally dissipative, vibration-damping devices (dash pots) in any of the tungsten alloy counterweight devices and systems cited above. Indeed, special care has been taken in all of the patents to affix the tungsten alloy counterweights immovably to the interior of shafts. In U.S. Pat. No. 4,461,479 to Mitchell, for example, counterweights are encased tightly in flexible sleeves that, in turn, are bound tightly within clubs' hollow shafts in an effort to insulate the tungsten alloy golf weight from mechanical stresses, such as vibrations of the shafts.

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Golf clubs, and a matched set of golf clubs, with each golf club having a hollow shaft with a head end and grip end. A resilient grip is fitted about the grip end of each shaft, and the grip has a butt end and a forward end and a midpoint there between. A clubhead is secured to the head end of each shaft. A frictionally-dissipative, vibration-damping tungsten alloy counterweight (dash pot) is positioned within each hollow shaft (except for that of the 1-wood or driver) at the grip end thereof. The tungsten alloy counterweight is at least substantially entirely contained between the midpoint and the butt end of the grip. The various tungsten alloy counterweights are sized to position the center of gravity of each individual club a selected distance from the head end of the hollow shaft of the individual club, such that the selected distance does not decrease for successively shorter clubs in the matched set.

Any additional weight in a golf club can only retard a club's swing speed at impact, and that any weight not in the clubhead thereby necessarily reduces the maximum amount of momentum that the club can transfer to the ball.

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A cemented carbide tool for cutting, punching or nibbling which, by means of a special way of manufacturing, has surprisingly better properties in comparison to those of conventional tools.The manufacture of sheet metal parts is normally done by cutting and punching. By both of these methods the parting of the material occurs between two edges working against each other. The yield point of the material is exceeded at sufficiently a high cutting or punching force.

Nibbling is used for the purpose of cutting contours in normally 3-10 mm thick sheet metal. Cylindrical punches of steel or cemented carbide are most frequently used in a nibbling machine. They perforate the sheet metal by a movement perpendicular to the metal through a die used as a dolly. When nibbling and punching holes, different widths of the slot in the die are used, which are adjusted to suit the composition and sheet thickness of the material. When a so-called "wide slot" is being used, the cutting, when nibbling is taking place, depends on both shear and tensile forces. Using a narrow slot, the cutting of the sheet takes place due to pure shear forces.




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A cemented carbide tool for cutting, punching or nibbling which, by means of a special way of manufacturing, has surprisingly better properties in comparison to those of conventional tools.

The normal wear pattern of a steel nibbling punch is that material by abrasion is worn off and moved up along the punch. Because of the wear pattern, the punch turns conical which in turn finally causes an increased friction force that changes the cutting quality to an unacceptable level. When using cemented carbide punches, this wear process is considerably slower, but with the same result as obtained by the used of steel punches. Due to the brittleness of the cemented carbide the risk of fracture is great. As a result, cemented carbide punches are used only exceptionally.

A cemented carbide preferably for use in rock drilling but also for wear parts and other parts exposed to wear. It is characterized by a core containing eta-phase surrounded by cemented carbide free from eta-phase.


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Carbide surgical tools are made of carbide,like nickel binder tungsten carbide. The cutting surface may be prepared by polishing it until it has the desired surface porosity.A carbide surgical tool usually has a cutting surface with fewer than about 10 pores per square centimeter that are greater than about 12 nanometers in size.

The characteristics of carbide surgical tool helps it maintaining the integrity of the cutting edge for periods that are much longer than prior art tools. The sub-ferrous porosity of nickel carbide advantageously provides a surgical tool that is resistant to corrosion and most importantly resistant to pathogen attachment or entrapment. Additionally, surgical tools fabricated from materials such as nickel carbide produce a tool having superior tactile qualities.




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Carbide surgical tool has a body portion having an ergonomic handle. The ergonomic handle is configured from nickel carbide. Nickel carbide has a density of about 14 to about 17 g/cm3 with particular reference to about 15 g/cm3 and a sub-ferrous porosity. The most significant benefit of is ergonomics of the handle have been optimized to take advantage of weight and balance of nickel carbide.

It is known that cutting edge that dulls during the course of surgery, unfortunately, causes increased tissue trauma and therefore a prolonged period of healing of an incision and potential scaring or infection as a result of the incision being open for a longer period of time.Surgical cutting edges produced from materials having a high porosity are prone to corrosion and therefore dulling of the cutting surface due to this corrosion. Additionally, surgical tools fabricated from materials having a high porosity are also prone to pathogen entrapment and or attachment. Contaminated surgical tools will infect a patient during surgery.


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