MXPA98005695A - Multiple density golf bow head and fabricac method - Google Patents

Abstract

A multi-density club head including discrete heel and toe sections and a discrete center section, the center section being formed of a material that is relatively less dense than that of the heel section and the tip. Materials in the heel, tip and center segment extend throughout the depth of the head of the golf club. The placement of the highest density regions in the heel and tip of the golf club provides heel-tip weight distribution characteristics. Also disclosed is a method for manufacturing a golf club head according to the present invention. The method incorporates various manufacturing techniques into a method for manufacturing the golf club head of the present invention.

Description

MULTI-DENSITY GOLF STICK HEAD AND METHOD OF MANUFACTURING The present is a continuation in part of the patent application of the United States of America serial number 08 / 897,076, which was filed on July 18, 1997.

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to golf club heads, and more particularly, to a golf club head which includes sections having different densities and materials.

Description of the Related Art At present, golf clubs can be classified into three groups: wooden, iron and for soft hits. Generally, wooden golf clubs are used by golfers in the starting point area to direct the golf ball over long distances. The wooden golf clubs were originally constructed of wooden materials, such as plaque. Although golf clubs constructed from wood materials are still appreciated by many golfers, their performance may be less than optimal due to the density of the wood material used. Therefore, the "metal-wood" club was created to improve the performance of wood-type clubs. A metal-wood club reproduces the shape of a traditional wooden club but has a head completely made of steel or other metallic material. The iron golf clubs are usually used for intermediate hits usually between the starting point field and the turf where the hole is located. Typically, an iron golf club has a head which is made of some form of metal, such as steel, which forms the entire head of the golf club. The third type of golf club, for soft strokes, is used on or around the area of the lawn where the hole is to introduce the golf ball into the hole. The golf club head for soft strokes is usually constructed of a metallic material, such as iron. The golf clubs of wood, of iron and for soft blows all have a striking face, which makes contact with the golf ball, when the ball is hit by the head of the golf club. Golf clubs for soft and iron punches typically have a striking face with a flat or flat surface. A wood-type club is conventionally provided with a striking face having buckled and wavy curvatures and is not flat or flattened. Several strategies have been used to improve the striking characteristics of the heads of the golf clubs. One of the strategies has been to add inserts to the face of the golf club head. To design a golf club with face inserts, the insert material is selected to provide the desired striking characteristics in the golf club. The properties of the insert material, such as weight, friction, flexural modulus and hardness, can greatly influence the golf club's striking characteristics. For example, insert materials that have a high coefficient of friction tend to produce a golf club that generates higher levels of spin on the golf ball, which allows the golfer to control and manipulate the golf shot better. . However, the novice player may not prefer a golf club that produces high levels of spin on the golf ball, as it may reduce the distance of the golf shot and may increase the tendency of the golf ball to hit it with flight. bend or hit it with effect. Many variations of golf club heads having said face inserts have been proposed. Generally, the insert covers only a portion of the golf club's face and extends toward the club only for a portion of the depth of the golf club head. Usually, the head of the golf club has a backing material where the insert is placed. Examples of golf club heads having inserts can be found in U.S. Patents. Nos. 4,883,275; 5,538,249; 5,405,136; 5,423,535; 5,489,094; and 5,575,472. Another strategy to improve the striking characteristics of golf club heads is to adjust the weight distribution within the clubhead. It is well known that head weight distribution affects the tendency of the golf club head to rotate around the handle of the golf club during the impact of the ball / stick, especially when the impact of the ball / club occurs in a position on the face of the golf club instead of the center of gravity. Several weight techniques have been tried to reduce this rotational tendency by changing the distribution of weight on the head of the golf club. Such techniques usually involve either the weight at the perimeter where the weight is distributed towards the areas of the perimeter of the golf club away from the center of the golf club head, or the weight at the heel-tip where the Materials that have different densities are used in the heel, tip and center portions of the golf club head in order to distribute more weight in the heel and tip of the golf club. One way to distribute the weight on the perimeter is to use perimeter weight inserts. The use of lower density face inserts also serves to distribute the weight towards the perimeter of the golf club head. The characteristics of weight distribution in the perimeter can also be achieved by configuring a golf club head to produce a cavity in the back of the club thus producing a complex shape, where the weight of the golf club is greater along the perimeter of the head of the golf club. A version of the weight distribution in the heel-tip involves the manufacture of a golf club head, where high density alloys are used in the heel and tip portions of the golf club head and a Low density alloy in the center portion of the golf club head. In the patent of E.U.A. No. 4,992,236 are examples of weight distribution techniques in the perimeter and in the heel-tip. Since the use of weight distribution in the perimeter, in the heel-tip and face inserts in the design of golf club heads has improved the performance of the golf clubs, these techniques have also increased the price of these clubs. Specially designed golf courses, since the manufacturing and assembly operations used to produce these types of golf club modifications are relatively complex. Therefore, there is a continuing need in the art for a golf club head that combines the performance characteristics of golf club heads that have weight distribution at the perimeter and weight distribution at the heel-tip and operating characteristics of golf club heads using inserts, and can provide a better feel and head structure, which limits the adverse effects of an off-center impact of the ball / club, while obtaining cost efficiencies of manufacturing not possible with the complex manufacturing operations used in current golf club designs.

BRIEF DESCRIPTION OF THE INVENTION The present invention mitigates to a large extent the disadvantages of golf club heads having perimeter weight distribution and face inserts by providing a golf club head with a uniform depth construction, a relatively dense section in the heel and tip of golf club head, and a relatively less dense section in the center of the golf club head. The relatively dense materials in the heel and tip regions of the golf club head extend throughout the depth of the golf club head, respectively in the heel and tip regions. Also, the lowest density material in the center region of the golf club head extends over the entire depth of the head of the golf club in the central region. The placement of the higher density regions in the golf club heel and tip provides desirable heel-to-tip weight distribution characteristics. Specifically, a high inertia design is achieved by placing high density metals at the tip and heel as far as possible from the center segment of the golf club head. The central segment of the head is made with materials of lower density. A high inertia design is desired to prevent the head of the golf club from twisting when hitting a golf ball instead of "gently positioning" or centering the gravity of the club. It is preferred that the center segment of the golf club head be made of a fiber reinforced composite material, although any suitable material preferably having a density that is smaller than that of the heel and / or the regions of tip of the clubhead. An exemplary club head having aspects of the present invention comprises three discrete segments: a bead formed of a dense metallic material; a tip formed of a dense metallic material; and a central segment formed of a non-metallic material. The non-metallic material of the central segment has a substantially lower density than the metallic materials comprising the heel and the tip. The heel, tip and center segment are joined together to form a striking face, which is used to make contact with the golf ball when the golf club is balanced. The non-metallic material used in the central segment is substantially homogeneous throughout the entire length of at least one plane perpendicular to the striking face of the golf club head. In other words, at least one depth running through the center segment from the front surface to the rear surface of the golf club head could consist entirely of the non-metallic material. The present invention also provides a method for manufacturing a golf club head in accordance with the present invention. The method of the invention includes the steps of: forming the golf club head tip in a first forming operation and forming the heel of the golf club head in a second forming operation. The heel and the tip are then placed in a molding die on opposite sides of a die chamber, which is configured to form a central segment of the head of the golf club. The center segment of the golf club head is then formed through a plastic molding operation, which introduces polymeric material into the die chamber. The resulting club head includes a central segment connecting the heel and the tip in a unitary golf club head structure. In an alternate method of the invention, the heel, tip and center segment are formed in separate operations and the three parts are assembled together in a golf club head, using threaded fasteners and an adhesive, which is placed between each one of the parts. Various fabrication procedures are suitable for forming the heel and tip of the golf club head, such as: powder metallurgy, which includes a compaction operation at a warm temperature or at room temperature with a concreting procedure at high temperature and optionally followed by a cycle of forging or metal infiltration, injection molding, melting to the wax loss and machination. Suitable plastic molding operations to form the center segment and connect the heel and tip include resin transfer molding, injection molding, reaction-injection molding and compression molding. Therefore, it is an object of the present invention to provide a golf club head that combines a better feel and head structure, which limits the adverse effects of an off-center ball / stick impact while obtaining cost efficiencies. of manufacture not possible with other designs of heads of golf clubs. Still another object of the present invention is to provide a method for manufacturing a golf club head having a bead formed of a dense metallic material, a tip formed of a dense metallic material, and a central segment formed of a non-metallic material.

BRIEF DESCRIPTION OF THE DRAWINGS These and other aspects, features, objects and advantages of the present invention will be better understood after considering the following detailed description, appended claims and accompanying drawings in which: Figure 1 is a front perspective view of a golf club head for gentle strokes made in accordance with the present invention; Figure 2 is a rear perspective view of a golf club head for soft strokes according to the present invention; Figure 3A is an exploded view of the components of a golf club head for soft strokes made in accordance with the present invention; Figure 3B is a sectional view taken along the line 3B-3B of Figure 3A, showing a cross-section of the center segment of a golf club head for soft strokes made in accordance with the present invention; Figure 4 is a front view of an iron-like club head made in accordance with the present invention; Figure 5 is a front view of a wooden club head made in accordance with the present invention; Figure 6 is an exploded view of a golf club head for soft strokes made in accordance with the present invention, wherein the center segment is not shown, the view illustrating depressed areas on the internal surface of the components; Figure 7A is an exploded view of the heel and tip components of a golf club head for soft strokes made in accordance with the present invention, wherein the center segment is not shown, the view illustrating projections on the inner surface of the components; Figure 7B is an end view of a heel component of a golf club head for soft hits made in accordance with the present invention, the view showing a projection on the inner surface of the heel; Figure 7C is a front view of the bead component shown in Figure 7B, the view showing the projection on the inner surface of the bead; Figure 8 is a perspective view of the lower half of a molding die used in a first method of the present invention; Figure 9A is a perspective view showing a second method for producing a golf club head according to the present invention; and Figure 9B is a sectional view taken along line 9B-9B of Figure 9A, showing a step of the second method of the present invention. It should be understood that the drawings are not necessarily for scaling and that the modalities are sometimes illustrated through graphic symbols, faded lines, diagrammatic representations and fragmentary views. In certain cases, details that are not necessary for an understanding of the present invention or which make other details difficult to perceive, may be omitted. Of course, it should be understood that the invention is not necessarily limited to the particular embodiments illustrated herein. Similar reference numbers will be used to refer to the same or similar parts of Figure a Figure in the following description of the drawings.

DESCRIPTION OF THE PREFERRED MODALITIES The various golf club heads described below have certain aspects in common, and the following description and claims employ common directional words that relate to those aspects. The hitting surface of the ball or the "striking face" of the golf club head, which is intended to hit the golf ball, is located on the "front" part of the golf club head.

The terms "upper" and "lower" assume that the golf club head is oriented as if the golf ball was held by a golf player in a resting position, ie, the lower part of the club head. golf could make contact with the field when it is at rest. Those skilled in the art can also refer to the lower part of the golf club head as the "base". The heel of the golf club head is located laterally opposite to the tip of the head of the golf club. The heel portion of the club head may be closer to the golfer when the player holds the club in a resting position. The term "depth" refers to a dimension that extends from front to back of the head of the golf club.

Referring now to Figures 1, 2, 3A and 3B, the numeral 20 generally designates a club head for soft strokes, which includes a body 2 and a post 22. The pole is provided with a hole 23 for joining the head of golf club 20 to a conventional handle. The body includes a heel 24, which is attached to the post 22, a tip 25, a lower surface 26, an upper surface 27, a rear surface 28, a generally flat striking face 29, and a central segment 30. An expert in the art it could be realized that the club head for soft strokes 20 presented in the Figures is a golf club head for soft "blade" type strokes. However, the present invention also applies to golf club heads for commonly sold "hammer" soft strikes and less conventional soft-club golf club designs. The material of the central segment 30 is different from the material of the heel 24 and the tip 25. Typically, the central segment 30 preferably comprises a non-metallic material and the heel 24 and the tip 25, each preferably comprising a metallic material. In the Figures, shading is used to illustrate metallic materials and striped lines are used to illustrate non-metallic materials. The metallic material used in the heel and tip may be the same or different, depending on the desired striking characteristics. As used throughout the specification and claims, the term "metallic material" refers to an engineering material that includes at least one metal. Therefore, an organic material that has metal can be considered as a metallic material. In many cases, the non-metallic material of the center segment 30 will be softer than the metal material of the heel 24 and the tip 24. The middle segment 30 will thus be cushioned and absorb the impact with the ball. In one embodiment of the invention, the central segment 30 comprises an elastomer. Preferably, the elastomer is a thermoplastic elastomer selected from the group consisting of copolymers of styrene, copolyesters, polyurethanes, polyamides, olefins and vulcans. Inorganic fillers may also be added to the elastomer to achieve any combination of desired properties in the central segment 30. For example, the fillers may be reinforced to the elastomer. Suitable inorganic fillers include: glass; graphite or aramid fibers; silicates; calcium carbonate; silica; metal oxides such as aluminum oxide, titanium dioxide and zinc oxide; lampblack; and metal powders. It is preferred that a fiber reinforced composite material is used to form the center section 30, such as a thermoplastic polyamide reinforced with fibers or a thermoset fiber reinforced polymer, as described in more detail below. In another embodiment of the invention, the central segment 30 comprises a thermoset polymer. Suitable thermosetting resins to form the central segment 30 include epoxides, polyimides and polyester resins. The preferred thermosetting polymer is an epoxy resin. Preferably, the thermoset polymer is reinforced with fiber. Suitable fibers include glass, graphite fibers and aramid. The fibers may be oriented in the central segment 30 in any manner, such as randomly, or in a single direction or in multiple orientations (eg, 45 or 90 degrees). Preferably, the fibers used to reinforce the thermoset polymer are continuous; however, randomly oriented, dull fibers, or woven fibers may also be used. For example, the central segment 30 comprises an epoxy resin reinforced with continuous fiber. Although the central segment 30 of non-metallic materials is constructed in the preferred embodiments, it should be understood that in alternate embodiments of the present invention, the central segment 30 can be constructed of other suitable materials having a lower density than the materials of the heel or tip, such as for example, a metallic material, a metal-containing composite material, or a metal matrix composite material of low density reinforced with fiber (as an example, aluminum reinforced with boron fiber). The specific material selected for the center segment preferably has a minimum hardness of Shore D 50 hardness since it is understood that the United States Gol Association requires this minimum hardness in the hitting face of the golf club head. The heel 24 and the tip 25 each preferably comprise a metallic material including at least one metal, and preferably each comprises a metallic material including at least two metals. The metallic materials should preferably have a final alloy density of at least 7 grams per cubic centimeter, although it should be understood that any density that is greater than that of the middle section can be selected. In a more preferred version of the invention, the metallic materials have a final alloy density of 7 to 13 grams per cubic centimeter. In a still very preferred version of the invention, the metallic materials have a final alloy density of 9 to 11 grams per cubic centimeter. In a very preferred version of the invention, the metallic materials have a final alloy density of about 10 grams per cubic centimeter. The heel 24 and the tip 25 can each also comprise a metallic material, wherein a first metal is dispersed in a second metal or in a non-metallic matrix material. The dispersion of the first metal is the second metal is advantageously achieved through powder metallurgy techniques, wherein a powder the first metal is mixed with a powder of a second metal and the resultant metal powder mixture is compacted and concreted at temperatures by below the melting point of both metals. The first metal must have a higher density than the second metal. The addition of a high density first metal to a second metal of lower density allows the final alloy density of the metal material of the bead 24 and the tip 25 to be increased in precision increases. In specific embodiments of the invention, the first metal has a density of at least 10 grams per cubic centimeter, and the second metal is selected from the group consisting of iron-based alloys, nickel-based alloys, and base alloys. coppermade. Specific examples of a suitable first metal include tungsten, tantalum, niobium, and molybdenum. In one embodiment of the invention, the metallic material has a final alloy density of at least 10 grams per cubic centimeter and the metallic material has a final alloy density of at least 8 times greater than the density of the non-metallic material. Although the heel and tip are constructed of metallic materials in the preferred embodiments, it should be understood that in alternate embodiments the heel and tip may be constructed of non-metallic materials that are relatively dense compared to the material of the central section. The materials used to form the central segment 30 produce a final product, wherein the material has a substantially homogeneous composition. In addition, the non-metallic material comprising the central segment 30 of the golf club head in the preferred embodiment is substantially uniform throughout the entire length in at least one plane perpendicular to the striking face 29, as shown in the Figure 3B. Figure 4 illustrates an iron-like club head 40, which is made according to the invention. As can be seen from Figure 4, the head of golf club of type 40 has identical characteristics to the golf club head for soft strokes 20, namely the relatively dense heel and toe, combined with a less dense center section, so reference can be made to the description of the golf club head for previous soft strokes. Similarly, Figure 5 illustrates a wood-like club head 50, which is made according to the invention and has identical characteristics to the golf club head for soft strokes 20. Therefore, it can be made reference to the above description of the golf club head for soft strikes 20 for a description of the characteristics of the club wood club head 50. A golf club head according to the present invention can be made from according to any suitable method that results in a golf club head having sufficient integrity, although the methods set forth in the present description are preferred. In a preferred embodiment, the heel and tip of the club head are prepared by any suitable technique, such as by a powder metallurgy technique. For example, a first mold is prepared, which has the shape of the tip 25 of the golf club head and a second mold is prepared having the shape of the heel 24 of the golf club head. These molds can be prepared using techniques and materials known to those skilled in the powder metallurgy art. After having prepared the molds, each one is filled with a metallic powder material. Preferably, the same powder metal material is used in the first mold and in the second mold. However, different metallic powder materials can be used in the first mold and the second mold. After the metallic powder materials have been placed in the first and second molds, the metallic powder materials can be processed to the heel and tip portion of the golf club head through various powder metallurgy techniques. Specifically, more complex bead and tip designs can be produced using cold isostatic pressure and pressureless concretion, while less complex bead and tip designs are best produced using hot die compaction, which is also referred to as compression with heat or concretion under pressure. A combination of cold die compaction and pressureless concretion can also be used to produce the heel and tip.

In the powder metallurgical process using cold isostatic compression and pressure-free concretion to form the heel and tip, the first and second molds, which contain the powdered metal material, are compressed to a sufficient pressure to form a compact green metallic material in the mold. Typically, the pressure is applied equally to dust on all sides. Preferably, isostatic compression occurs at ambient temperatures and the molds are made of elastomeric materials. After the compression step, the green compact is removed from the mold and the part can be cut if necessary to obtain the desired shape. Preferably, the minimum finish of the green compact is necessary. After the green compact has been properly cut, if necessary, then it is heated to an elevated temperature to obtain the densification of the metallic materials in the green compact through a concreting procedure. The particular temperature used in this step of the process will vary depending on the metallic materials used in the mold. The powder metal bead and toe sections of the golf club head of the present invention are best produced through solid state concretion. This procedure requires that the green compacts are kept at a very high temperature just below the melting point of the metallic materials. The step of concreting the process is generally carried out without the introduction of pressure in the heating chamber. In the method of the present invention which employs isotactic compression and concretion without pressure to form the bead and the tip, the second mold having the shape of the heel is formed in such a way as to produce a hole in the compact green bead after the heel. compression. A third mold is then prepared in the shape of a pole of the golf club head and filled with a third metallic powder material. The powdered metal material in the third mold is then compressed to a sufficient pressure to form a green compact of the powdered metal material. The green compact is then removed from the third mold. One end of the green compact that has the shape of the pole is then inserted into the compact green hole formed in the heel configuration of the golf club head. The heel and post compacts are fixed together tightly, so that the alignment of the heel and the post can be maintained during the subsequent processing. The combined heel and post compacts are then heated to an elevated temperature to form a concreted heel that includes an integral post. The third metallic powder material used in this version of the method of the present invention may be identical to or different from the first and second metallic powder materials. In the powder metallurgy method employing cold die compaction and pressureless concretion to form the bead and tip, the metallic powder materials in the first and second molds are compressed to a sufficient pressure to form a green compact of the metallic material in mold. Generally, compression occurs at room temperature. After the compression step, the green compact is removed from the mold and then heated to an elevated temperature to obtain the densification of the metallic materials in the compact green through a concretion procedure. The step of concreting the process is generally carried out without the introduction of pressure in the heating chamber. The compaction of die at room temperature and the concretion without pressure are usually carried out when metal powders are more easily compacted. In the powder metallurgy process that employs heat-set compaction to form the heel and tip, the first and second molds, which contain the metallic powder materials, they are placed in an oven and the pressure and temperature are simultaneously applied to the metallic materials to obtain the densification of the metallic materials in the mold. The particular temperature and pressure used in the die-compaction step of the process vary depending on the metallic materials used in the mold. Compression under heat is typically conducted at about half the absolute melting temperature of the powdered metal material, which is usually a lower temperature than that used in the non-pressured concreting process. After the concreted heel and the concreted tip of the golf club head are produced, either by pressureless concreting or the heat compression process, they are allowed to cool and are then removed from the heating chamber. Preferably, the concreting process produces a heel and toe portion with almost net shape of the golf club head. The heel 24 and the tip 25 can also be formed by other suitable forming processes that achieve a heel 24 and tip 25 construction having sufficient structural integrity for use in the golf club head of the present invention. In one of said alternative embodiment, the heel 24 and the tip 25 are formed using a process of lost wax casting techniques. In this process, wax models of the heel and tip are made in an injection mold, and the models are then attached to a central member to form a "tree". The tree is coated or submerged, in a ceramic slurry and allowed to dry. The wax is removed from the "tree" by heating in an autoclave under the influence of heat and pressure, the remaining ceramic "body or shell" is calcined at high temperature to impart strength. The liquid metal is emptied into the ceramic mold and allowed to solidify to produce a bead or tip. The commercially available high density alloys are suitable for melting and pouring to casting molds to loss wax. Preferably, a high density ferrous alloy having a density of between 7 and 8 g / cm 3 is used in the lost wax casting process. The liquid metal used in the lost wax casting process can also be produced by melting a metal rod, which was formed through powder metallurgy techniques. In this version of the lost wax casting process, powder metallurgy techniques can be used to produce a metal bar having a higher density than commercially available alloys. Accordingly, when the liquid metal produced by melting the metal rod solidifies in the mold, it will produce parts having a higher final density than the parts produced from commercially available alloys. The heel 24 and the tip 25 of the golf club head 20, 40 or 50, are formed alternately using machining techniques, wherein the heel 24 and / or the tip 25 of the golf club head is machined from a solid piece of a metallic material such as a metallic material or a metal alloy. In another alternative method, the heel and clubhead tip can be formed using injection molding, wherein a fluid mixture that includes a polymeric material, a fiber material and a metallic material, is injected into a first die chamber with an appropriate shape. The first and second die chambers are then cooled to solidify the formed component. The central segment 30 of the golf club head 20, 40 or 50 is also formed by various methods that produce a central segment 30 having suitable ball striking characteristics. In one method, the center segment 30 is formed and connected to the heel 24 and the tip 25 together in a unitary golf club head structure in a single operation. Alternately, the central segment 30 is formed in a separate step before the joining step which fixes the heel 24 and the tip 25 to the central segment 30. In the single operation mode (ie, a modality of the die chamber), the central section 30 can be manufactured by a molding process or any other method that produces a preformed structure in a suitable manner. In one example of the molding technique, the center section 30 is formed in a mold by placing a preformed heel 24 and a preformed tip 25 on opposite sides of a die chamber and the center segment 30 is molded therebetween. In this way, the golf club head 20, 40 or 50 is formed, and the heel 24, the tip 25 and the central sections 30 are joined together. In the die chamber mode, the preformed heel 24 and the tip 25 are placed in a molding die 55 on opposite sides of a die chamber as shown in Figure 8. The die chamber 60 is the molding die 55 formed in the shape of the central segment 30 of the head of the die. golf club 20 of the present invention. The molding die 55 is shown in Figure 8 with the tip and bead installed in the die chamber 60 on the left portion of the molding die 55. The right portion of the molding die 55 in Figure 8 shows the given 60 without the tip and the heel installed in the die. It can be seen that the molding die 55 holds the heel and the tip in a confronting relationship on opposite sides of the die chamber 60. In the method of the present invention, various plastic molding operations can be used to introduce polymeric material in the die chamber and form the center segment of the golf club head Four types of plastic molding operations are particularly advantageous when employed in the method of the present invention. First, molding by resin transfer, wherein a polymeric material is injected into a closed mold at low pressure, could be suitable for forming the center segment of the golf club head. The low pressures used in resin transfer molding allow the use of molds that can contribute to a cost effective procedure. Resin transfer molding can be an excellent choice of process for low to moderate production operations, and is suitable for forming the core segment from a thermoplastic polymer material or a thermoset polymeric material, with or without a fiber preform of reinforcement. Second, injection molding, the most widely used plastic molding operation, may be beneficial in the method of the present invention. Injection molding techniques have now been developed to the point where extremely complex forming can be molded into cost-effective operations. Third, reaction-injection molding, where two or more liquid materials are mixed under high pressure and the resulting mixture is then injected into a mold at lower pressures, where the reaction of the material is complete, may be suitable in the method of the present invention. Fourth, compression molding, wherein a polymeric material is placed in a hot mold, and pressure is applied by compression and heat to the mold to form a product, may be beneficial in the method of the present invention. After the polymeric material has been introduced into the die chamber 60, the center segment 30 of the golf club head 20 of the present invention is formed. Since the heel and tip are arranged in a confronting relationship on opposite sides of the die chamber 60, as shown in Figure 8, the polymeric material is bonded to an internal surface 75 of the bead and an inner surface 70 of the tip when the polymeric material is introduced into the die chamber 60. After completing the molding operation, the central segment 30 connects the heel and the tip in a unitary golf club head structure. After removing the golf club head from the molding die, any minor flashing or passing marks may be removed on the center segment 30 of the golf club head 20. In addition, the striking face 29 of the club head 20 can be ground to obtain a more pleasing aesthetic appearance. The resulting club head 20 has a high density bead 24, a lower density center segment 30, and a high density tip 25. In a preferred embodiment, compression molding is used to simultaneously form the central segment 30 of the golf club head 20, 40 or 50, from a thermofixed polymer and connect the heel 24 and the tip 25 to the central segment 30 in a unitary golf club head structure. In this embodiment, the process begins by impregnating the continuous reinforcing fibers with a system of uncured thermosetting resin and arranging the fibers in the form of a sheet. A preform is prepared by cutting the impregnated sheet by die and a laminated form is created with the approximate shape of the finished part, that is, the central segment 30 of the golf club head 20, 40 or 50. The pre-form is then consolidated vacuum to impart handling resistance. The heel 25 and the tip 25 are then placed on a compression molding die on the opposite sides of a die chamber as shown in the Figure 8. The preform is placed in the die chamber between the sections of the heel 24 and the tip 25. The cover of the compression molding die is closed and the entire mold is placed inside a platen press. The heated platens apply the uniform compression load to the compression molding die, thus consolidating the preform. The compression molding die is maintained at an elevated temperature in order to allow the resin to flow. The resin fills the die chamber and moistens the bonding surfaces of the heel 24 and the tip 25. The combination of pressure and temperature serves to cure the thermosetting resin, which forms a structural adhesive bond with the metal surfaces of the bead 24 and the tip 25. After the compression molding cycle is completed, the molding die is removed from the platen press, opened, and a unitary golf club head is removed in a semi-finished state. Any amount of resin spillage (flash) can easily be removed on the heel sections 24 and tip 25 of the golf club head, since the resin is still hot and flexible. The final finish, including grinding, polishing, drilling, etc., can be done after molding, although the procedure is capable of producing a finished, clean part, with appropriate tools, surface finishes with tool, and process parameters. Thermosetting used in the preferred embodiment of the method of the invention may be the preferred epoxide, a polyimide resin (which possesses superior thermal properties) or cheaper polyester systems. A variety of epoxy systems are available with varying cure times and temperatures, flow characteristics and modifiers, to provide varying tenacity, elasticity, chemical resistance and mechanical strength. The impregnated reinforcement fibers can be oriented in any way, such as randomly, in one direction or in multiple orientations (eg, 45 or 90 degrees). Randomly oriented, dull fibers may also be used, or woven fibers may also be used to give, for example, improved tear strength properties. Various fiber materials can be used to produce the specific properties. In a preferred configuration, graphite fibers are used as the primary structural reinforcement. Graphite is preferred over glass or aramid fiber in this application, due to its relatively high modulus of elasticity and superior sound damping characteristics. Graphite also offers beneficial electrical properties. Specifically, the graphite fibers are electrically conductive, and when they are molded in the center segment, they contact randomly with the metal interface surfaces of the bead 24 and the tip 25 of the golf club head. As a result, the graphite fibers provide very low strength electrical continuity between the metal sections of the bead 24 and the tip 25. This provides the advantage that electrochemical, coating, finishing or cleaning processes are subsequently employed in the process of manufacturing, since it is only necessary to establish a single point of electrical contact (typically at the tip). The preforms can also be formed and pre-consolidated around a mandrel or metal part model. In another variation, the preform can be wound around a mandrel by a numerically controlled filament rewinder by computer, which either wet the fiber with resin as it is dispensed for winding, or embolus a fibrous preform which subsequently has the resin transferred to it under pressure to achieve impregnation. The pre-consolidation of the preform can be achieved by the preferred vacuum method, or by mechanical means in a simplified compression mold. The impregnated fibers that create the outer surface and the hitting face of the golf club head, they can be of several forms. Fiber reinforcements and / or different orientations can be used to achieve different mechanical and optical properties on the striking face. Similarly, the resin used in the impregnated layers can be varied for the purpose of achieving different mechanical and optical properties at the striking face of the golf club head. Chemical modifiers can also be added to adjust the toughness, abrasion resistance, sound deadening, or resin color. In one embodiment, fiberglass is used in a colored epoxy resin matrix to achieve a rigid surface, resistant to wear, with a pleasant aesthetic appearance. The method of the present invention, wherein the center section 30 is formed in a mold between the heel 24 and the tip 25, can be modified in order to improve the performance characteristics of the resulting club head. For example, process variations are available that increase the metal / non-metal bond area and provide support for the joints between the center segment 30 and the tip 25, and between the center segment 30 and the heel 24. In a first variant of the method that increases the metal / non-metal bonding area, the tip and the heel 24 are formed so that a projection develops on the inner surface 70 of the tip and the inner surface 75 of the heel 24 which are attached to the polymeric material in the center segment of the golf club head A version of these projections is shown in Figure 7A. In Figure 7A, it can be seen that an L-shaped projection 71 is formed on the inner surface 70 of the tip 25 and an L-shaped projection 76 is formed on the internal surface 75 of the heel 24. Another version is shown of the projections in Figures 7B and 7C. In this embodiment, a "ducktail type" configuration, as indicated by the reference numeral 80, forms a channel 81 within which the polymer can flow during the molding cycle to create a mechanical clamping mechanism for the assembly. In the embodiment of the invention which uses a fiber-reinforced composite material to form the central segment 30, it may be desirable to place individual, pre-compacted, impregnated sheets in the die cavity to ensure flow to the ducktail channel and secure the preform. The projections on the heel 24 and the tip 25 can also be formed using other methods. For example, in a method employing the powder metallurgy methods, as described above, at least one metal member, such as a stainless steel pin or plug, is introduced into a surface of each of the green compact before the compact green ones are heated to an elevated temperature. At least a portion of the metal member is let out from the surface of the green compact. When the green compacts are heated to an elevated temperature, the metallic member is diffusion bonded to the metallic material in the green compact. In this variant of the method, a projection is developed, consisting of the portion of the metal member leaving the surface of the green compact, on a surface of the heel 25 and on a surface of the tip 24. When the tip and the heel are placed in the molding die, as shown in Figure 8, the projections are arranged so as to make contact with the polymeric material when the polymeric material is introduced into the die chamber of the molding die. In this way, the solidified polymeric material, which comprises the center segment of the golf club head, surrounds the projections on the tip and the heel, providing an increased bonding area of metal / polymeric material. The arrangement of the tips of the tip and the heel in the polymeric material provides the golf club head with increased resistance to shear stresses both on the first edge between the center and the tip and on the second edge between the center segment and the heel of the golf club head. Nevertheless, even if the projections are formed on the inner surfaces of the heel and tip portions, the non-metallic material of the central segment will extend, along at least one plane perpendicular to the striking face of the club head of golf, in the depth from the hitting face of the head of the golf club to the back surface of the head of the golf club. In a second variant of the method that increases the metal / non-metal bonding area, the tip and the heel are formed so that a depressed or cutting area develops on the inner surface of the tip and the inner surface of the bead. A version of these depressed areas is shown in Figure 6, where it can be seen that a depressed area or cut 72 is formed on the inner surface 70 of the tip 25. A similar depressed area or cut 77 is formed on the inner surface 75 of the heel 24. When the tip and the heel are placed in the molding die, as shown in Figure 8, the cuts 72, 77 are arranged facing the die chamber so that the polymeric material can flow towards the cuts 72, 77 at the tip and the heel when the polymeric material is introduced into the die chamber. In the embodiment of the invention using fiber reinforced epoxy to form the central segment, it may also be desirable to place individual impregnated sheets, not pre-compacted, in the die cavity to ensure flow to the cuts and secure the preform. This arrangement of the heel, tip and center segment of the golf club head provides an increased bond area of metal / polymeric material and increases the strength of the golf club head to the shear stresses that may develop in both the first edge between the center segment and the tip as in the second edge between the center segment and the heel of the golf club head. In yet another variant of the method of the method of the present invention, the internal surface 70 of the tip and the internal surface 75 of the bead are coated with a bonding agent before being placed in the mold die. The tip and the heel are then arranged in a molding die with the surfaces coated in a confronting relationship on opposite sides of the die chamber, so that the coated surfaces are brought into contact with the polymeric material when the polymeric material is introduced into the die chamber. The resulting bond between the polymeric material and the metallic materials is of improved strength. This improved joint resists the effects of shear stresses on both the first edge between the center segment and the tip and on the second edge between the center segment and the heel of the golf club head when the golf club head is in contact with an object. The heel 24, the tip 25 and the center segment 30 of the golf club head 20, 40 or 50 can be assembled to form a golf club head using any other method that results in sufficient structural integrity. In another embodiment, the heel 24, the tip 25 and the central segment 30, are chemically bonded and secured with mechanical fasteners. Referring now to Figures 9A and 9B, heel 24, tip 25 and center segment 30 are prepared, using any method, such as those described above. The holes 91, preferably tapered, are then drilled in the bead 24 and tip 25, to accept a fastener 92, such as a threaded stud, a pin or any suitable fastener. The pilot splicing holes 93 are also formed in the central segment, if by perforation, the formation when the central segment is formed (such as in the molding process), or any other method. Before assembling, an appropriate adhesive 94 is applied to the joint interface and the heel 24, the tip 24 and the center segment 30 are fixed in place with the fasteners 92. In the preferred embodiment, the taper 95 allows the screw rods to interfere with the holes 91 and produce a load that increases the joint and seals the holes 91. The adhesive 94 is cured with time and temperature, and the heads of the screws 97 are then supported on the of the heel and tip surfaces 96. It can be seen that the taper section 95 allows the screws to develop the necessary hole and preload interference, and still allow the screw heads 97 to be removed without compromising the preload or structural integrity of the fastener. It may also be desirable to add an effective amount of a colorant to the material used to form the central segment 30, such that it has a different color than the heel 24 and the tip 25. The heel 24 and the tip 25 (or its respective surfaces) can also be treated in such a way that they have a different appearance from that of the center segment 30. It is believed that contrasting colors in the heel, tip and center segment of the golf club head provide an appearance nice aesthetics. Various surface treatments can also be used to color the tip and heel portion. Suitable surface treatments may include: organic coatings, such as paint or preferably an enamel or acrylic electrocoating; conversion coatings such as zinc phosphate, magnesium phosphate or smoke oxide; or galvanic coating such as an electrolytic coating of zinc, nickel or chromium with a dark colored dichromate finish, for example, zinc electrolytic coating with smoke dichromate. In addition, the appearance of the hitting surface of the ball of the golf club head is improved by grinding the striking surface of the ball. In the process variant, wherein a surface treatment step is included in the method of the invention, the grinding step can generally be performed before any surface treatment since grinding the ball striking surface can Remove the liner on the heel or tip. Suitable materials that will be used in the method of the present invention have been mentioned above in the description of the golf club head of the present invention. Primarily, the center segment can be formed from an elastomer such as a thermoplastic elastomer selected from the group consisting of copolymers of styrene, copolyesters, polyurethanes, polyamides, olefins, and vulcans. Inorganic fillers may also be added to the elastomer to allow one to obtain any combination of desired properties in the core segment. For example, fillers can reinforce the elastomer. Suitable inorganic fillers include: glass; graphite or aramid fibers; silicates; calcium carbonate; silica; metal oxides such as aluminum oxide; titanium dioxide and zinc oxide; black smoke and metal powders. A highly preferred elastomer is a thermoplastic polyamide reinforced with fiber. Most preferably, the center segment is formed of a reinforced thermosetting polymer using the preferred embodiment of the method of the invention. Suitable thermosetting resins to form the center segment include epoxy resins, polyimide resins and polyester resins. The preferred thermosetting resin is the epoxy resin. The thermosetting resin is preferably fiber reinforced. Suitable fibers include glass, graphite fibers and aramid. The most preferred material for forming the center segment is an epoxy polyimide reinforced with continuous fiber. The metallic powder material used in the molding, compaction and concreting processes may preferably comprise a metallic material including at least two metals. After finishing the step of concreting the method, it is preferred that the metallic materials in the concreted bead and the concreted tip have a final alloy density of at least 7 grams per cubic centimeter. In a very preferred version of the invention, the metallic materials in the concreted bead and the concreted tip have a final alloy density of 7 to 13 grams per cubic centimeter. In a still highly preferred version of the invention, the metallic materials in the concreted bead and the concreted tip have a final alloy density of 9 to 11 grams per cubic centimeter. In a very preferred version of the invention, the metallic materials in the concreted heel or concreted tip have a final alloy density of about 10 grams per cubic centimeter. Furthermore, it is preferred that the density of the concreted bead and the density of the concreted tip be at least 8 times greater than the density of the central segment. Powdered metal materials may also include a first powdered metal dispersed in a second powdered metal, wherein the first metal has a higher density than the second metal. Preferably, the first powder metal has a density of at least 10 grams per cubic centimeter, and the second powder metal is selected from the group consisting of iron-based alloys, nickel-based alloys., and copper-based alloys. Specific examples of a suitable first metal include tungsten, tantalum, niobium and molybdenum. Ferrous alloys are the preferred metal used in the lost wax casting process that forms the heel and tip of the golf club head of the present invention. It has been found that a ferrous alloy having a density of about 7 to about 8 g / cm 3 is advantageous when used in the lost wax casting process. In this way, it is seen that an improved golf club head and a method to manufacture it is provided. It can be seen that the golf club heads of the present invention have desirable heel-to-tip weight distribution characteristics. Specifically, a high inertia design is obtained by placing high density metals at the tip and heel (or as far as possible from the center segment of the golf club.) The center segment of the golf club is made of lower density materials. you want a high-inertia design to prevent the golf club from twisting when it hits a golf ball in another "soft spot" or center of gravity of the golf club.In addition, the method of the present invention provides significant cost savings With respect to other procedures used to produce high performance golf clubs, the use of advanced powder metallurgy or wax casting techniques allows the production of heel and tip sections with almost net shape of the golf club head. This results in the elimination of manual finishing procedures.The techniques of powder metallurgy and wax casting loss also allow the density of the heel and tip to be pre tightly controlled and altered by changing the ratio of heavy and light metals in the powdered metal mix. The use of plastic molding techniques to produce the center segment of the golf club head also reduces manufacturing costs. In addition, the elimination of many manufacturing steps also reduces the waiting time for the production of the golf club head of the present invention. Although the present invention has been described in considerable detail with reference to certain preferred embodiments, one skilled in the art will appreciate that the present invention can be practiced by other preferred embodiments, which have been presented for purposes of illustration and not limitation. Therefore, the spirit and scope of the appended claims should not be limited to the description of the preferred embodiments contained herein.

Claims (56)

1. CLAIMS 1. - A golf club head comprising three discrete segments including: a heel that is formed of a first material having a first density; a tip that is formed of a second material that has a second density; and a central segment that is formed by a third material having a density less than the first density and the second density, the heel, the tip and the central segment being joined together.
2. 2. The golf club head according to claim 1, characterized in that it further comprises a striking face extending through one side of the heel, the tip and the central segment, said third material being of the central segment substantially homogeneous totally along at least one plane perpendicular to said striking face.
3. 3. The golf club head according to claim 1, further characterized in that the third material of the central segment is a non-metallic material.
4. 4. The golf club head according to claim 1, further characterized in that the third material of the central segment is a fiber-reinforced composite material.
5. 5. The golf club head according to claim 1, further characterized in that the third material comprises an elastomer that includes an inorganic filler.
6. 6. The golf club head according to claim 5, further characterized in that the inorganic filler is selected from the group consisting of glass, graphite, aramid fibers, silicates, calcium carbonate, silica, metal oxides, carbon black and metal powders.
7. 7. The golf club head according to claim 1, further characterized in that the third material comprises a thermosetting polymer.
8. 8. The golf club head according to claim 7, further characterized in that the third material includes said thermosetting polymer reinforced with a fiber.
9. 9. The golf club head according to claim 8, further characterized in that said fiber is selected from the group consisting of glass, graphite, aramid fibers and boron.
10. 10. The golf club head according to claim 1, further characterized in that the first material and the second material are the same material.
11. 11. The golf club head according to claim 1, further characterized in that the first material and the second material are metallic materials.
12. 12. The golf club head according to claim 1, further characterized in that the first material and the second material are the same material and are both metallic materials; and said third material of the center segment is a fiber reinforced composite material.
13. 13. The golf club head according to claim 1, further characterized in that both the heel and the tip define a tapered opening for receiving a fastener and said central section defines plural guide openings, each guide opening splicing an opening corresponding to said openings defined in each bead and said tip. The golf club head according to claim 14, characterized in that it further comprises: a fastener received in said tapered opening in said heel and said splicing guide opening in said central section, said bead holding said central section; and a fastener received in said tapered opening in said tip and said spout opening in said central section, said tip attaching said central section. The golf club head according to claim 14, characterized in that it further comprises a chemical bonding agent that joins the heel to said central section and a chemical bonding agent that joins said tip to said central section. 16. A golf club head comprising: three discrete segments including a bead that is formed of a dense first metallic material, a tip formed of a second dense metallic material, and a central segment that is formed of a non-metallic material which have a substantially lower density than the metallic materials comprising the heel or tip, said heel, tip and central segment being joined together; and a striking face extending through one side of the heel, tip, and center segment, said non-metallic material comprises said center segment which is substantially substantially the entire length in at least one plane perpendicular to said striking face. 17. A golf club head comprising: three discrete segments including a bead that is formed of a dense first metallic material, a tip that is formed of a second dense metallic material, a central segment that is formed of a non-metallic material, metal having a substantially lower density than the metallic materials comprising said bead and said tip, the bead, the tip and the central segment joined together; and a slap face extending through one side of the heel, tip and center segment; said non-metallic material comprises the central segment being substantially homogeneous along the entire length of at least one plane perpendicular to the striking face, wherein the first and second metallic materials each comprise at least two metals, and the first and second metals Metallic materials each have a final alloy density of at least 7 grams per cubic centimeter. 18. The golf club head according to claim 16, further characterized in that the non-metallic material has a homogeneous composition. 19. The golf club head according to claim 18, further characterized in that the first and second metallic materials each comprise at least two metals, and the first and second metallic materials each have a final alloy density of at least 7 grams per cubic centimeter. 20. The golf club head according to claims 17 or 19, further characterized in that the first and second metallic materials each have a final alloy density of 7 to 13 grams per cubic centimeter. 21. The golf club head according to claim 20, further characterized in that the first and second metal materials each have a final alloy density of 9 to 11 grams per cubic centimeter. 22. The golf club head according to claim 21, further characterized in that the first and second metallic materials each have a final alloy density of about 10 grams per cubic centimeter. 23. The golf club head according to claims 17 or 19, further characterized in that the first and second metallic materials each comprise a first metal dispersed in a matrix of a second metal, the first metal having a greater density than the second metal. 24. The golf club head according to claim 23, further characterized in that the first metal has a density of at least 10 grams per cubic centimeter, and the second metal is selected from the group consisting of alloys based on iron, nickel-based alloys, and copper-based alloys. 25. The golf club head according to claims 16 or 17, further characterized in that the non-metallic material is an elastomer. 26. The golf club head according to claim 25, further characterized in that the elastomer is a thermoplastic elastomer selected from the group consisting of copolymers of styrene, copolyesters, polyurethanes, polyamides, olefins and vulcans. 27. The golf club head according to claim 26, further characterized in that the elastomer is a polyurethane. 28. The golf club head according to claims 1, 16 or 17, further characterized in that the golf club head is selected from the group consisting of iron-type golf club heads, club heads, Wood type golf and golf club heads for soft strokes. 29. The golf club head according to claims 1, 16 or 17, further characterized in that the material of the central section includes a coloring agent that makes it a color different from that of any of the heel or tip. 30. - A method for making a golf club head having a heel, a point and a central segment between the heel and the tip, the method comprising the steps of: forming the clubhead head from a first material in a first training operation; forming the heel of the golf club head from a second material in a second forming operation; forming the center segment of the golf club head through a plastic molding operation, which introduces a material from the clubhead into a chamber between the heel and the tip, whereby the center segment connects to the heel and the tip in a unitary golf club head structure. 31.- A method for making a golf club head having a heel, a tip and a central segment connecting to the heel and the tip, the method comprises the steps of: forming the tip of a golf club head from of a metallic material in a first forming operation; forming the heel of the golf club head from a metallic material in a second forming operation; placing the bead and tip in a molding die on opposite sides of a die chamber, the die chamber being configured to form the center segment of the golf club head; and forming the center segment of the golf club head through a molding operation, which introduces a polymeric material into the die chamber whereby the central segment connects the heel and the tip to a club head structure. unitary golf 32. - The method according to claim 30 or 31, further characterized in that the chamber is a die of compression molding, the method further comprising: placing the bead and the tip in a mold die on opposite sides of the chamber, the camera being configured to form the center segment of the golf club head, before the step of forming the center segment. 33.- The method according to claim 30 or 31, characterized in that it also comprises the steps of: forming a preform of said central section; and placing the preform in said chamber before the step of forming said central section. 34. The method according to claim 30 or 31, further characterized in that the forming step of the center section includes molding the center section using a fiber-reinforced composite material. 35.- The method according to claim 30 or 31, further characterized in that each of the steps of heel formation and tip formation include forming operations selected from the group consisting of cold isostatic compression and concretion without pressure, compaction in die at room temperature, and concretion without pressure, compaction of die hot, injection molding, wax casting loss and machining. 36.- The method according to claim 30 or 31, further characterized in that the tip is formed so that a depressed area develops on a surface of the tip, the bead is formed so that a depressed area develops in a Heel surface, and the tip and heel are placed in the die so that both depressed areas come into contact with the polymeric material when the polymeric material is introduced into the die chamber. 37.- The method according to claim 30 or 31, further characterized in that the tip is formed in such a way that a duck-tail type projection occurs on a surface of the tip; the bead is formed so that a projection develops on one surface of the heel, and the tip and heel are placed on the molding die so that both projections contact the material of the club head when the material of the clubhead is introduced into the die chamber. 38.- The method according to claim 30 or 31, further characterized in that the step of forming the central segment includes a step of adding colorant to said central section, making the central section of a color different from that of either the tip and the heel. 39.- The method according to claim 30 or 31, further characterized in that at least one connection surface formation is formed on a surface of the heel or tip in the first and second forming operations, and the tip and The beads are placed in the mold die so that at least one connection surface formation is brought into contact with the polymeric material when the polymeric material is introduced into the die chamber. The method according to claim 30 or 31, characterized in that it further comprises the step of: coating at least one surface of the tip or the heel with a bonding agent, wherein the tip and the heel are placed in the molding die so that at least one surface coated with the bonding agent is brought into contact with the polymeric material when the polymeric material is introduced into the die chamber. 41. The method according to claim 30 or 31, further characterized in that the step of forming the central segment includes introducing an elastomer into the chamber. 42. The method according to claim 41, further characterized in that the elastomer is a thermoplastic elastomer selected from the group consisting of copolymers of styrene, copolyesters, polyurethanes, polyamides, olefins and vulcans. 43.- The method according to claim 41, further characterized in that the elastomer is a polyurethane. 44. The method according to claims 30 and 31, further characterized in that the plastic molding operation is selected from the group consisting of molding by resin transfer, injection molding, reaction-injection molding, and compression molding. 45. The method according to claim 30 or 31, further characterized in that: the step of forming the golf club head comprises filling a first mold that has the shape of the golf club head tip with a first powder metal material, compress the first powder metal material in the first mold at a sufficient pressure to form a green compact of the first powder metal material, remove the green compact from the first mold and heat the compact green at a temperature high enough to form a concreted tip; and the step of forming the heel of the golf club head comprises filling a second mold having the shape of the heel of the golf club head with a second metallic powder material, compressing the second metallic material into powder in the second. mold at a sufficient pressure to form a green compact of the second metallic powder material, remove the green compact from the second mold, and heat the green compact at an elevated temperature to form a concreted heel. 46. The method according to claim 45, further comprising the steps of: inserting at least one metal member into each of the green compact before the green compact is heated to an elevated temperature so that it develops a projection on a surface of the concreted tip and a projection develops on a concreted heel surface, wherein the concreted tip and the concreted bead are placed on the casting die so that both projections contact the polymeric material when the polymeric material is introduced into the die chamber. 47. The method according to claims 30 and 31, further characterized in that the step of forming the golf club head comprises filling a first mold having the shape of the golf club head tip with a first powder metal material and applying pressure and simultaneously heating the first powder metal material to form a concreted tip; and the step to form the heel of the golf club head comprises filling a second mold having the shape of the golf club head with a metallic powder material and applying pressure and simultaneously heating the second metallic powder material to form a concrete heel. 48. - The method according to claim 45 or 47, further characterized in that the concreted heel and the concreted tip formed from the step of heating the green compact at an elevated temperature are almost net. 49. The method according to claim 45 or 47, further characterized in that the metallic powder materials each comprise at least two metals, and the concreted tip and the concreted heel each have a density of at least 7 grams per cubic centimeter. 50.- The method according to claim 49, further characterized in that the concreted tip and the concreted heel each have a density of at least 7 to 13 grams per cubic centimeter. 51.- The method according to claim 45 or 47, further characterized in that the first second metallic powder materials each comprise a first metal dispersed in a second metal, the first metal having a lower density than the second metal. 52. The method according to claim 51, further characterized in that the first metal has a density of at least 10 grams per cubic centimeter, and the second metal is selected from the group consisting of alloys based on iron, base alloys of nickel and copper-based alloys. 53. The method according to claim 45 or 47, characterized in that it further comprises the steps of: forming the second mold so that a hole develops in the green compact after compression; filling a third mold that has the shape of a pole of the golf club head with a third metallic powder material; compressing the powdered metal material in the third mold at a sufficient pressure to form a green compact of the powdered metal material; remove the green compact from the third mold; and inserting one end of the green compact formed in the third mold into the hole of the green compact formed in the second mold whereby the concreted heel formed when the green compacts are heated to an elevated temperature includes an integral post. 54.- The method according to claim 30 or 31, further characterized in that: the step of forming the golf club head comprises filling a first mold that has the shape of the golf club head tip with a first liquid metal material and allowing the liquid metallic material to cool to form the tip; and the step of forming the heel of the golf club head comprises filling a second mold having the heel shape of the golf club head with a second liquid metal material and allowing the second liquid metal material to be cooled to form a heel The method according to claims 30 and 31, further characterized in that: the step of forming the clubhead head comprises machining a solid piece of a metallic material to form the tip; and the step of forming the heel of the golf club head comprises machining a solid piece of a metallic material to form a bead. 56.- The method according to claims 30 and 31, further characterized in that: the step of forming the golf club head comprises injecting a mixture of fluid including a polymeric material and a metallic material into a first chamber of die configured to form the tip; and the step of forming the heel of the golf club head comprises injecting a fluid mixture including a polymeric material and a metallic material into a second die chamber configured to form the bead; and the first and second die chambers are cooled to form the heel and tip.