Beta hxl golf club head

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WO1999036133A1 - Temperature compensated golf club head - Google Patents

By collegefbfan , 23 hours ago in Instruction and Playing Tips. Welcome to TST. Signing up is free , and you'll see fewer ads and can talk with fellow golf enthusiasts. Share More sharing options Followers 0. Note: This thread is days old. We appreciate that you found this thread instead of starting a new one, but if you plan to post here please make sure it's still relevant.

If not, please start a new topic. Thank you. Recommended Posts. Hacker James September 26, September 26, edited. Not too shabby. Edited September 26, by Hacker James. Link to comment Share on other sites More sharing options Awards, Achievements, and Accolades. NM Golf September 26, September 26, I am forced to ask September 27, Vinsk September 27, Tough crowd here Typhoon92 September 27, Nice job!

CaseyD September 27, That looks pretty sic. Hacker James September 27, NM Golf September 27, September 27, edited. He could still wonder why you bothered… they're scratches. Beta hxl golf club head Hacker James September 28, September 28, Hacker James October 22, October 22, Here is a photo of two hits in succession.

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I am listening to 23rd Street. Mostly 's through 's music. My Swing Zeph. Evolvr, for sure. My indoors setup is pretty close to ready. In a variation, a golf club head may comprise a shape memory alloy in an annealed condition so that the impact surface exhibits high elastic behavior at the higher playing temperatures and heat recoverable shape memory behavior at the lower playing temperatures.

The impact surface may be formed as a thin plate of shape memory alloy. Alternatively, the impact surface may be fabricated using first and second zones distributed on the impact surface, the zones being of material with residual work hardening or annealed material in accordance with a predetermined distribution.

The impact surface may be fabricated from wire segments of shape memory alloy which are arranged in parallel configuration having wire segment ends forming the impact surface. For a better understanding of the present invention, together with other and further objects thereof, reference is made to the following description, taken in conjunction with the accompanying drawings and its scope will be pointed out in the appended claims.

Figure 1 represents the specimen length versus the temperature in a constant load test of the stress-strain behavior of a NiTi based shape memory alloy in the annealed condition, respectively above and below the transformation temperature. Figure 2 is a graph showing the stress-strain behavior of a NiTi based alloy at different temperatures.

Figure 3 is a front view of a golf club head in accordance with the present invention. Figure 4 is a cross-sectional view of the Figure 3 golf club head. Figure 5 is a cross-sectional view of an alternate golf club head in accordance with the present invention. Figure 6 is a front view of an another alternate embodiment of a golf club head. A shape memory alloy, such as nickel-titanium based alloy, can be used as part of a golf club head in order to stabilize the feel of the club.

The shape memory alloy, which is selected to have an appropriate transformation temperature, when properly conditioned will become stiffer at higher temperatures and less stiff at colder temperatures. This type of club head will allow the head stiffness to compensate for the change in the golf ball's characteristics at different temperatures.

Golf balls get stiffer at cold temperatures and softer at higher temperatures. Transformation temperatures are those temperatures at which shape memory alloys change from the higher temperature Austenite to the lower temperature. Martensite or vice versa. There are numerous ways of determining transformation temperatures.

One way is to use a constant load test. It is straightforward to apply a load to the alloy and monitor its deformation and shape recovery simultaneously with temperature as the material is cooled and heated through the transformation range. For example, the elongation and contraction of a shape memory wire under constant tensile loading is shown in Figure 1 , as the temperature is lowered and subsequently raised.

Generally, the specific load that the material will see in the actual application is used for the test to simulate the conditions in practice. The temperature points noted are ones frequently used to describe the behavior of a particular alloy. M s point is the temperature where the Martensite starts to form on cooling and M f point is the temperature at which the material becomes fully Martensitic because of cooling.

A s point is the temperature which marks the start of Austenite formation on heating, while A f point identifies the temperature whereat the transformation to Austenite is completed. This type of test is generally used for applications which utilize the shape memory effect in NiTi. The transformation temperatures depend on the particular alloy and its working and annealing history, and are stress dependent parameters, i.

In order to determine the transformation temperatures at zero stress, a curve such as that shown in Figure 1 must be obtained at two or more stress levels. The particular transformation point of interest can then be extrapolated to zero stress. As used in this application the term "transformation temperature" refers to the arithmetic average of the four transformation temperatures M s M f , A s and A f In the temperature range of approximately 15 degrees above the transformation temperature, shape memory alloys in the annealed condition exhibit high elasticity.

Figure 2 shows an example of a stress strain curve for a NiTi golf club impact surface at different temperatures. In one example, the NiTi surface is made of The material is then work-hardened. The material is finally heat treated at degrees C for thirty minutes which removes most of the work hardening.

Figure 2 shows that for a given strain on the NiTi alloy, the stress will be different at different temperatures. A higher stress level means the material is stiffer and does not have a lot of "give. Us pga golf 2019 betting This flexibility compensates for the hardness of the golf ball in cold weather. Curve also shows that upon removal of stress there is only partial elastic recovery.

The material returns to its original shape, however, when heated above the transformation temperature to cause it to revert to the Austenite phase. This phenomena is called heat recoverable shape memory. Stress-strain curve shows the material having higher stress for the same strain amount. This shows that the material at 56 degrees F 13 degrees C is stiffer than at 32 degrees F.

Thus a golf ball which is not as hard in hot temperatures will be compensated for by causing the club face to be stiffer. Stress-strain curve shows the NiTi material at degrees F 38 degrees C. In the case of desert golf or warmer climates, this condition can occur often. The curve shows a high level of stress at low strain levels and indicates that the material is very stiff at the high temperature.

Since golf is an outdoor game, usually played in spring through fall weather, the outdoor temperatures usually encountered might be considered to vary between extremes of zero degrees C, representing a very cold spring or fall morning, to about 40 degrees C, representing warm afternoon temperatures in hot areas of the country, such as desert areas. Accordingly, the inventors have concluded that it would be advantageous to select the transformation temperature of a material for a golf club impact surface to be at the lower end of the playing temperature range, that is from about 0 to about 15 degrees C, to thereby provide a highly elastic but stiffer golf club impact surface at temperatures above the transformation temperature, representing the higher playing temperature range, such as between 20 and 40 degrees, or more preferably between 25 and 40 degrees C.

A softer material with a stress strain characteristics for the lower temperatures as shown in Figure 2 will be realized at the lower temperature range at which playing might occur, for example between zero and 20 degrees C, more preferably between zero and 15 degrees C. This variation in stiffness of the impact surface of a golf club head effectively compensates for changes which naturally occur in the stiffness of a golf ball.

At lower temperatures, golfers experience a "ringing" of a golf club shaft which is the result of the fact that the golf ball has become harder. By providing a material which has decreased stiffness for the golf club impact surface at low temperature, the ring or vibration in the golf club shaft can be reduced, giving the golfer a more comfortable feel for the impact and otherwise improving and elongating the impact time between the golf ball and the golf club head.

At higher temperatures, the golf club head impact surface is stiffer, while the golf ball itself is softer, so that a relative uniformity of impact time between the golf club head the golf ball is achieved, providing the golfer with relatively uniform performance in using the club as play temperatures vary. Figures 3, 4, 5 and 6 depict specific exemplary constructions which can be used to provide a golf club head with an impact surface having a shape memory alloy with properties in accordance with the present invention.

In particular Figure 3 illustrates a frontal view of a golf club head 10 which is connected to a shaft The golf club head 10 includes a body portion 12 and an impact surface A cross- sectional view of the Figure 3 golf club head, is shown in Figure 4, wherein impact surface 14 is formed of a plate of shape memory alloy material, such as nickel- titanium shape memory alloy or a ternary or several addition nickel-titanium based shape memory alloy.

Alternate material includes copper based shape memory alloys and including single crystal copper based shape memory alloys. Patent 5,, proposes that the impact surface 14 comprise a thin plate of shape memory alloy material which exhibits stress-induced martensite elasticity.

Accordingly, one following the teachings of that patent, would select a material to have a stress-induced martensite elasticity over the entire temperature range of use, and accordingly M s below the lower range of normal use, in particular below zero degrees C. Impact surface 14 is formed as a thin plate which is embedded within a recess in golf club head 12 between blade 18 and sole In accordance with the present invention the plate 14 is fabricated from a shape memory alloy, which has a transformation temperature of approximately 0 to 20 degrees C, preferably 0 to 15 degrees C, to cause a transformation between the stiffer elastic behavior represented by curve in Figure 2 at the higher end of the normal playing range of temperatures, and a softer, partially elastic behavior represented by curve of Figure 2, which is exhibited at the lower end of the playing range of temperatures.

Accordingly the golf club head of Figures 3 and 4 has a softer impact characteristics at lower playing temperatures than at higher playing temperatures. Figure 6 illustrates a gold club head 10 which is made up substantially of a shape memory alloy having similar stress-strain properties as the shape memory alloy of the Figure 3 and 3 impact plate In this case, the plate would be integral with the rest of the head.

In an alternative embodiment, different characteristics of the shape memory alloy caused by different amounts of work hardening and annealing can be used in connection with the impact surface 14 of the golf club head of Figures 2 and 3. In either the annealed or work-hardened shape memory alloy impact surface, the impact surface 14 may be adjusted in thickness to provide the correct impact modulus.

A further embodiment of the invention is depicted in the cross-sectional view of Figure 5. This figure represents a golf club head having an impact surface formed using the pixel technique described in U. In this case the impact surface 22 is formed using a material with individual impact zones formed, for example, by using individual wire segments having their ends forming the outer impact surface or by using varying treatment conditions for zones of a single plate material, all as described in the aforementioned copending application, the disclosure of which is incorporated herein by reference.

In connection with treatment of a single plate by varying treatment, the use of heat treatment to soften some pixel areas of the impact surface as compared to others, may be used as described in the copending application. In addition to the variation in treatment of the materials as described in the copending application, the construction shown in Figure 5 can be advantageously used to provide an impact surface 20 having relatively uniform impact conditions over the entire surface area but having a variation in impact characteristics with temperature as represented by the stress strain characteristics of Figure 2.

In either case the material forming the impact surface and the impact zones, or the material forming the wires used to form an impact surface with wire segments ends, would be material having a transformation temperature preferably in the range of 0 to 15 degrees C, as described. While there have been described what I believe to be the preferred embodiments of the present invention, those skilled in the art will recognize that other and further variations may be made thereto without departing from the spirit of the present invention and it is intended to claim all such changes and modifications as fall within the true scope of the invention.

A golf club head for striking a golf ball and having temperature variable impact properties, said club head comprising an impact surface or portion thereof fabricated from a shape memory alloy having a transformation temperature in the range of 0 to 15 degrees C, said impact surface having stiff, substantially elastic impact characteristics at playing temperatures higher than said transformation temperature and having softer impact characteristics at playing temperatures lower than said transformation temperature; whereby the variation in stiffness of the impact surface of the golf club head when striking a golf ball over a range of playing temperatures above and below said transformation temperatures compensates for changes in the stiffness of a golf ball due to changes in the range of playing temperatures.