CN1436576A - Iron golf club head - Google Patents

Abstract

The invention provides a head, for a golf club iron, which has a high impact restitution to a ball to be hit, which imparts great spin to the ball, has great resistance to scratching, has superior strength, and has excellent durability. A head 1 for a golf club iron is provided with a head frame 2, which is integrally molded from an iron alloy, and with a plate-shaped face material 4 and a plate-shaped backing material 5 inside the opening portion 3 of the head frame 2. With this structure, the surface of the face material 4 is made a surface for hitting a ball. The face material 4 is made of a spring steel, and is bonded to the head frame 2 by welding. The backing material 5 is made of a material having a specific gravity of 4.4 or less and having a high specific strength and a high specific elasticity, such as an FRM.

Description

The iron golf club head

Technical field

The present invention relates to the iron golf club head that has intensity, durability, the rotatory of the resilience of playing ball and ball is all improved that constitutes by multiple parts.

Prior art

Before this, the iron golf club head has multifrequency nature simultaneously in order to make it, and majority is that multiple parts that mutually different materials is constituted are in addition compound and form.Fig. 6 A is the back view of being watched by dorsal surface from existing iron golf club head, and Fig. 6 B is the A-A line profile of Fig. 6 A.In addition, Fig. 7 A is the back view of another existing iron golf club head, and Fig. 7 B is the B-B line profile of Fig. 7 A.In addition, Fig. 8 A is the back view of another existing iron golf club head, and Fig. 8 B is the C-C line profile of Fig. 8 A.In addition, Fig. 9 A is the back view of another existing golf club head, and Fig. 9 B is the D-D line profile of Fig. 9 A.In addition, Figure 10 A is the back view of another existing iron golf club head, and Figure 10 B is the E-E line profile of Figure 10 A.

Shown in Fig. 6 A and Fig. 6 B, in existing iron golf club head 51a (below be called the 1st conventional example), setting has the caput body 52a of the flat structure of ferroalloy formations such as stainless steel, in the face of the playing ball zone that is equivalent to this caput body 52a, embedding and the different surfacing 53a that material constituted such as copper alloy that form caput body 52a.Surfacing 53a to caput body 52a adopt bonding, assembling, thick sticking, blast is compound etc., and way is fixed.Whereby, can improve the sensation when playing ball and the design of golf club head.

In addition, shown in Fig. 7 A and Fig. 7 B, in existing another iron golf club head 51b (below be called the 2nd conventional example), the face of playing ball and the back side of the caput body 52b that is made of stainless steel etc. use the coating 54 that is made of CFRP (carbon fiber reinforced plastics) to be covered.Whereby, can reduce the position of centre of gravity of caput.

In addition, shown in Fig. 8 A and Fig. 8 B, in existing another iron golf club head 51c (below be called the 3rd conventional example), caput body 52c has the cavity structure that is made of stainless steel, the inside material 55 that bonding CFPR constitutes at the back side of caput body 52c.Whereby, the inside material 55 absorbs the vibration when playing ball, thereby can improve the sensation when playing ball.

In addition, shown in Fig. 9 A and Fig. 9 B, in existing another iron golf club head 51d (below be called the 4th conventional example), the caput framework 58d of opening that be made of stainless steel, wrought iron or Be-Cu alloy, its play ball face respective regions and back side respective regions is set.And the above-mentioned face respective regions of playing ball in the peristome 56d of caput framework 58d is provided with the surfacing 53d that is made of titanium.Whereby, peristome 56d is set,, constitutes surfacing 53d, make the lightweight of caput than stainless steel and all light titanium of wrought iron by proportion 4.5.In addition, when playing ball, because surfacing 53d submissive, so, to the resilience height of playing ball.

In addition, another existing iron golf club head is shown in Figure 10 A and Figure 10 B.This iron golf club head 51e (below be called the 5th conventional example) is inventor's exploitation in the past, has done open in the fair 7-121284 communique of spy.Shown in Figure 10 A and Figure 10 B, in this iron golf club head 51e, the caput framework 58e that is made of metal material is set, on this caput framework 58e, form the play ball peristome 56e of face respective regions and back side respective regions of opening.And, the surfacing 53e that is made of FRP (fibre-reinforced plastics) is set in the above-mentioned face respective regions of playing ball in peristome 56e.In addition, on the face of playing ball of the face of the playing ball respective regions of caput framework 58e and surfacing 53e, form metallic film 57 below the thickness 100 μ m by means such as evaporations.In the 5th conventional example, surfacing 53e is formed by FRP, compares with above-mentioned the 4th conventional example, can make the further lightweight of caput, simultaneously, the resilience of playing ball is improved more.In addition, by on the face of playing ball, forming metallic film 57, can eliminate the incoordination of the outward appearance that is produced between the surfacing 53e that caput framework 58e that metal material constitutes and FRP form.

The problem that quasi-solution of the present invention is determined

Yet there is following point in above-mentioned prior art.In above-mentioned the 1st conventional example, the problem of existence is, the design height of sensation during above-mentioned playing ball and golf club head, and low to the resilience of playing ball, the flying distance of playing ball can not be extended.

In addition, in above-mentioned the 2nd conventional example, the problem of existence is coating 54 subject to damage that CFRP constitutes.In addition, also have a problem to be because the abrasion of coating 54 reduce the rotatory of playing ball.

In addition, in above-mentioned the 3rd conventional example, the problem of existence is, because the inside material 55 has the damping effect when playing ball, so the sensation when playing ball improves, but resilience of playing ball and the rotatory that has reduced.That is, to the rotatory of playing ball high resilience and having of the iron golf club head 51c of the 3rd conventional example, the iron golf club head that only is made of stainless steel with whole caput is identical.

In addition, in above-mentioned the 4th conventional example, the problem of existence is, surfacing 53d is made of titanium, and caput framework 58d is made by stainless steel, and both can not weld.Therefore, surfacing 53d has only by riveted joint on caput framework 58d and fixes, and can't obtain good constant intensity.In addition, titanium is bigger than the specific strength of stainless steel and wrought iron, and is littler than the specific strength of FRP, is difficult to further alleviate.In addition, because titanium is bigger than the rigidity of FRP, it is also limited that the resilience of playing ball is improved effect.

In addition, in above-mentioned the 5th conventional example, surfacing 53e is formed by FRP, compares with above-mentioned the 4th conventional example, the rotatory raising that can make the lightweight of caput and have.Yet surfacing 53e is made by FRP, and caput framework 58e is made by metal material, can not adopt means such as welding to fix securely, so, with bonding or riveted joint surfacing 53e and caput framework 58e are fixed, both constant intensities are low, and this is a problem.In addition, metallic film 57 is peeled off easily or is worn away under the impact of handstone and sand etc., and durability is insufficient, and this is a problem.Also have, when making iron golf club head 51e, form line of weakness on the surface of surfacing 53e, then, form metallic film 57, so the air exercise sphere does not carry out surface treatments such as sanding machine, the rotatory of ball is insufficient, and this also is a problem.

The present invention provides a kind of high to resilience of playing ball and the rotatory that has in view of these problems, and traumatic resistance and intensity are also high, the iron golf club head that durability is good.

Be used to solve the means of this problem

The feature of the iron golf club head that the present invention relates to is, comprising: at the surperficial upper shed of the making above-mentioned face respective regions and be fixed by welding in surfacing that the metal or alloy on the above-mentioned caput framework makes and configuration in above-mentioned caput framework, the backing material that contacts with the dorsal surface of above-mentioned surfacing of playing ball of caput framework and the lining of respective regions at the face respective regions and the back side of playing ball by metal or alloy.

In the present invention, owing to be provided with the caput framework of opening, thus can make the lightweight and the centre of gravityization of iron golf club head (the following caput that also is called for short).In addition, be the sandwich construction that constitutes by surfacing and backing material owing to form the structure of the face portion of playing ball, compare with single layer structure, the elastic deformation amount can strengthen.Its reason is described in down.Because the elastic deformation amount strengthens, the face of playing ball when playing ball and can extending the time of contact of ball can improve the effciency of energy transfer of caput to ball, can improve the resilience that caput is played ball thus.In addition, surfacing adopts and can make the metal or alloy plate that the caput framework welds, and can be fixed on the caput framework by welding, can improve the intensity of caput whereby.In addition,, the traumatic resistance of the face of playing ball can be improved, simultaneously,, the rotatory of ball when playing ball can be improved owing to the surface treatment that the surfacing surface is imposed regulation because surfacing is made by metal or alloy.

In addition, to embed in the above-mentioned caput framework be preferred in the end of above-mentioned backing material.Whereby, support backing material with the double-crank shape, surfacing can be out of shape independently, so the elastic deformation amount of the surface portion that is made of surfacing and backing material strengthens.The result is that the resilience of playing ball is further improved.

In addition, the proportion of above-mentioned backing material is preferred less than 4.4.Whereby, can make the further lightweight and the centre of gravityization of caput.As a result, the range of choice of the position of centre of gravity of caput and the size of moment of inertia etc. enlarges, and the design freedom of caput improves.In addition, above-mentioned backing material also can be overlapping and form multi-sheets.Thus, the elastic deformation amount of backing material is XXL more, and the resilience of playing ball be can further improve.In addition, by material mutually different multiple sheet material make up, can adjust the intensity, the coefficient of resilience, the sensation when playing ball of caput etc. arbitrarily, can satisfy multiple user's needs.

Also have, it is preferred that above-mentioned backing material is selected from that among CFRP (carbon fiber reinforced plastics), GFRP (fiberglass reinforced plastics), CFRTP (carbon fiber reinforced thermoplastic materials), Mg alloy, Al alloy, Be alloy and the FRM (fibre-reinforced metal) a kind or 2 kinds or above material make.

In addition, the dorsal surface of above-mentioned backing material is imposed to decorate to handle also can.Thus, can improve the commodity value of caput.In addition, before the caput assembling, because the dorsal surface of backing material is decorated, thereby can realize high value added product at low cost.

Brief description of drawings

Figure 1A is the front elevation from surperficial unilateral observation of the related iron golf club head of the embodiment of the invention, and Figure 1B is the F-F line profile of Figure 1A, and Fig. 1 C is the part amplification profile of Figure 1B.

Fig. 2 A-Fig. 2 D is the deformation dynamics simulation drawing of surface portion in the golf caput of the embodiment of the invention.The state that Fig. 2 A presentation surface part 8 is formed by 1 block of sheet material, Fig. 2 B represents its deformation dynamics, and Fig. 2 C presentation surface part 9 is by 2 identical states that sheet material overlaps to form of thickness, and Fig. 2 D represents its deformation dynamics.

Fig. 3 represents the amplification profile of the iron golf club head structure division that the present invention the 2nd embodiment relates to.

Fig. 4 A represents the iron golf club head profile that the embodiment of the invention is related, and Fig. 4 B represents the iron golf club head profile that comparative example is related.

The rigidity of the abscissa presentation surface of Fig. 5 part, ordinate represents to get the initial velocity of ball, is the influence figure of the rigidity of surface portion to the initial velocity of ball.

Fig. 6 A and Fig. 6 B are the iron golf club head figure of the 1st conventional example.

Fig. 6 A is a back view of observing caput from dorsal surface, and Fig. 6 B is the A-A line profile of Fig. 6 A.

Fig. 7 A and Fig. 7 B are the iron golf club head figure of the 2nd conventional example.

Fig. 7 A is a back view of observing caput from dorsal surface, and Fig. 7 B is the B-B line profile of Fig. 7 A.

Fig. 8 A and Fig. 8 B are the iron golf club head figure of the 3rd conventional example.

Fig. 8 A is a back view of observing caput from dorsal surface, and Fig. 8 B is the C-C line profile of Fig. 8 A.

Fig. 9 A and Fig. 9 B are the iron golf club head figure of the 4th conventional example.

Fig. 9 A is a back view of observing caput from dorsal surface, and Fig. 9 B is the D-D line profile of Fig. 9 A.

Figure 10 A and Figure 10 B are the iron golf club head figure of the 5th conventional example, and Figure 10 A is a back view of observing caput from dorsal surface, and Figure 10 B is the E-E line profile of Figure 10 A.

Embodiment of the present invention

With reference to the accompanying drawings embodiments of the invention are specifically described.At first the 1st embodiment of the present invention is illustrated.Figure 1A is the front elevation from the face side observation of the related iron golf club head of the embodiment of the invention, and Figure 1B is the F-F line profile of Figure 1A, and Fig. 1 C is the part amplification profile of Figure 1B.

Shown in Figure 1A, in the iron golf club head 1 that present embodiment relates to, axial region 2a and club head 2b are arranged on the caput framework of being made by wrought iron or ferroalloy 2 with global formation.Shown in Figure 1B, on caput framework 2, form opening on its surface and be the peristome 3 of face respective regions 2c and back side respective regions 2d of playing ball.On in the face of the surface of the peristome 3 of caput framework 2 the inner face 2e of caput framework 2 (below be called), form step discrepancy in elevation 2f and 2g.This step discrepancy in elevation 2f and 2g form all around round inner face 2e's.

Shown in Figure 1A and Figure 1B, in iron golf club head 1, surfacing 4 and backing material 5 are set in peristome 3.The shape of surfacing 4 is tetragonal tabular, and its end is assemblied in the step discrepancy in elevation 2f, and welds by laser weld or electron beam welding in caput framework 2.Therefore, form a plurality of welding portions 6 in the end of surfacing 4.Whereby, surfacing 4 disposes to clog peristome 3.That is, the configuration of surfacing 4 makes the face of the playing ball respective regions 2c on lining caput framework 2 surfaces, exposes facing to the outside of the caput 1 of iron golf rod.Thus, the surface of surfacing 4 becomes the face of playing ball of iron golf club head 1.In addition, backing material 5 to be shaped as square tabular, be configured on the position of dorsal surface of the surfacing 4 in the peristome 3, laying equal stress on is combined on the surfacing 4, the side of the face of playing ball of backing material 5 contacts with the dorsal surface of surfacing 4.Backing material 5, its end lies around, and is assemblied among the step discrepancy in elevation 2g on whole 4 limits.Thus, shown in Fig. 1 C, backing material 5 is by surfacing 4 and caput framework 2 clampings.

Surfacing 4 is formed by spring steel, and the SUP (spring steel steel) that for example puts down in writing among Cr-Mo steel, マ レ-ジ Application Network steel or the JIS forms.The thickness of surfacing 4, for example 0.6～2.5mm forms the surface of its face of playing ball at it, for example forms 4 line of weakness parallel to each other 7.The extending direction of line of weakness 7 becomes the general horizontal direction when playing ball.In addition, backing material 5 is to be formed by high specific strength and height ratio elastomeric material CFRP, GFRP, CFRTP, Mg alloy, Al alloy, Be alloy or FRM.FRM for example is aluminium borate (9Al ₂O ₃2B ₂O ₃) aluminium alloy that strengthens of whisker.The proportion of backing material 5 is below 4.4.

Also have, when the thickness of surfacing 4 was lower than 0.6mm, according to the material of surfacing 4, the intensity of surfacing 4 was not enough sometimes.In addition, in order to form line of weakness 7 on surfacing 4, thickness must be more than 0.6mm.On the other hand, when the thickness of surfacing 4 was higher than 2.5mm, the rigidity of surfacing 4 was excessive, and the resilience of playing ball is descended, and the initial velocity of playing ball reduces.Therefore, the thickness 0.6～2.5mm of surfacing 4 is preferred.

Secondly, the manufacture method to iron golf club head 1 describes.At first, wrought iron or ferroalloy are forged or casts, make caput framework 2 become an integral body.At this moment, on the inner face 2e of the peristome 3 of caput framework 2, forming step discrepancy in elevation 2f and 2g simultaneously, perhaps, form step discrepancy in elevation 2f and 2g successively by machining.Secondly, assembling backing material 5 among the step discrepancy in elevation 2g in peristome 3.On the other hand, the thickness that Cr-Mo steel, マ レ-ジ Application グ steel or SUP are constituted is that the sheet material of 0.6～2.5mm is processed into the regulation shape, after the fixed surface treatment of enterprising professional etiquette of face, forms line of weakness 7 on this surface, makes surfacing 4.At this moment, the vertical and lateral dimension of backing material 5 is according to vertically reaching more than the little 1mm of lateral dimension difference of surfacing 4.Secondly, assembly surface material 4 in step discrepancy in elevation 2f, weld facing to caput framework 2 usefulness laser weld or electron beam welding the end of surfacing 4.At this moment, make the end edge of backing material 5 be positioned at the inboard more than the end edge 0.5mm of surfacing 4 and dispose backing material 5 and surfacing 4.Whereby, because the heat in when welding, burning or gasification take place in backing material 5, produce gas, can prevent that thus unfavorable condition such as pinprick from taking place.Like this, the end of backing material 5 is by caput framework 2 and surfacing 4 clampings.Therefore, can make iron golf club head 1.

In the present embodiment, the face portion of playing ball (below be called surface portion) that is equivalent to iron golf club head 1 is 2 layers of structure that are made of surfacing 4 and backing material 5, with the surface portion of the 4th and the 5th conventional example is that the occasion of single layer structure is compared, and the elastic deformation amount can strengthen.Therefore, can make lengthening time of contact of the face of playing ball when playing ball and ball, increase, the resilience of playing ball is improved from the energy conversion efficiency of caput to ball.Below, its effect is described in more detail.

Fig. 2 A～Fig. 2 D is a surface portion deformation state simulation drawing, the situation that Fig. 2 A presentation surface part 8 is formed by 1 block of sheet material, Fig. 2 B represents its deformation state, and Fig. 2 C presentation surface part 9 is carried out the overlapping situation that forms by 2 blocks of identical sheet materials of thickness, and Fig. 2 D represents its deformation state.The sheet material that is shown in Fig. 2 A and Fig. 2 C is formed by same material, and the mechanical property of this material is mutually the same.If being shown in the sheet metal thickness of Fig. 2 A and Fig. 2 B is h ₁, the deflection degree when applying constant weight W on surface portion 8 is δ ₁, the sheet metal thickness that is shown in Fig. 2 C and Fig. 2 D is respectively (h ₂Deflection degree when/2), applying constant weight W on surface portion 9 is δ ₂

The intensity that is shown in the surface portion 8 of Fig. 2 A and Fig. 2 B is provided by following mathematical expression 1, and the bulk strength that is shown in the surface portion 9 of Fig. 2 C and Fig. 2 D is provided by following mathematical expression 2.In addition, the rigidity of surface portion 8 is provided by following mathematical expression 3, and the integral rigidity of surface portion 9 is provided by following mathematical expression 4.Also have, a and b are coefficients.

[mathematical expression 1]

a×h ₁ ²

[mathematical expression 2] $a\×\left[\frac{h_2}{2}\right]+a\×{\left[\frac{h_2}{2}\right]}^2=\frac{a\×{h_2}^2}{2}$

[mathematical expression 3]

b×h ₁ ³

[mathematical expression 4] $b\×{\left[\frac{h_2}{2}\right]}^3+b\×{\left[\frac{h_2}{2}\right]}^3=\frac{b\×{h_2}^3}{4}$

About the golf club head surface portion, it is high that intensity is wanted, and rigidity is low.Therefore, surface portion is made of with single layer structure 2 layers of structure to be compared, because the intensity height and the rigidity of surface portion are low, so, preferably select to satisfy the h of following mathematical expression 5 and 6 ₂Value.

[mathematical expression 5] $a\&times;h_1^2<\frac{a\&times;h_2^2}{2}$

[mathematical expression 6] $b\&times;h_1^3>\frac{b\&times;h_2^3}{4}$

Can derive following mathematical expression 7 by above-listed mathematical expression 5.In addition, can derive following mathematical expression 8 by above-listed mathematical expression 6.

[mathematical expression 7] $\sqrt{2}\&times;h_1<h_2$

[mathematical expression 8] $h_2<\sqrt[3]{4}\&times;h_1$

When above-listed mathematical expression 7 and 8 is gathered, set up following mathematical expression 9.

[mathematical expression 9]

1.41×h ₁＜h ₂＜1.58×h ₁

Therefore, for example, if h ₂=1.5 * h ₁, then surface portion has 2 layers of structure, compares with single layer structure, and intensity height and rigidity are low.Whole deflection degree δ when whereby, surface portion is 2 layers of structure ₂Whole deflection degree δ when (with reference to Figure 20), specific surface partly are 1 layer of structure ₁(with reference to Fig. 2 A) is big.The result is, when surface portion is 2 layers of structure, because the deflection when playing ball is big, the face of playing ball when playing ball extended with the time of contact of ball.Whereby, improve, the resilience of playing ball is increased from the effciency of energy transfer of caput to ball.

In addition, in the present embodiment, owing to form peristome 3 at caput framework 2, caput alleviates, and its position of centre of gravity reduces.In addition, caput framework 2 is made by wrought iron or ferroalloy, and surfacing 4 is formed by spring steel, and 4 pairs of caput frameworks 2 of surfacing can weld.Whereby, wait the occasion that surfacing 4 is fixed to compare with adopting riveted joint, the intensity height of caput, durability and reliability raising.In addition, formed by spring steel as surfacing 4, the traumatic resistance of the face of then playing ball increases, simultaneously, because its surface is imposed the surface treatment of regulation, so, can add the rotatory of ball to playing ball.In addition, owing to can suppress the abrasion of the face of playing ball, the reduction by the face coefficient of friction of playing ball can prevent rotating decline.

In addition, in the present embodiment, backing material 5 is formed by CFRP, GFRP, CFRTP, Mg alloy, Al alloy, Be alloy or FRM, because its proportion below 4.4, can make caput further lightweight and centre of gravityization.Therefore, the iron golf club head 1 of present embodiment, the ranges of choice such as size of its position of centre of gravity and moment of inertia are big, the design freedom height.In addition, mutual different surfacing 4 and the backing materials 5 of material characters such as intensity, Young's modulus, viscoplasticity made up arbitrarily, can adjust caput intensity, the coefficient of resilience, the sensation when playing ball etc. arbitrarily.Whereby, can satisfy the multiple user's request to the hobby difference of caput speed and sensation (sense of playing ball) because of the user.

Secondly, the 2nd embodiment of the present invention is described.Fig. 3 is a part of amplification profile diagram that the iron golf club head that relates to of present embodiment constitutes.The iron golf club head of present embodiment, wherein, backing material 5a is undertaken overlapping by intermediate materials 10 and the inside material 11 and forms.Intermediate materials 10 and the inside material 11, its end embeds in the caput framework 2.Intermediate materials 10 is formed by CFRP, GFRP, CFRTP, Mg alloy, Al alloy, Be alloy or FRM.Dorsal surface in the material 11 of the inside exposes the caput outside, decorates processing in its surface.The material that forms the inside material 11 is arbitrarily, and is for example identical good with intermediate materials 10, can use epoxy resin or ABS resin (acrylonitrile. butadiene. styrene resin) etc. the plastics class, still, must can decorate the material of processing.In addition, the whole proportion of backing material 5a is below 4.4.Present embodiment relates to the above-mentioned structure in addition of iron golf club head, and it is identical relating to iron golf club head 1 structure (with reference to Figure 1A～Fig. 2 C) with above-mentioned the 1st embodiment.

Secondly, the manufacture method of the iron golf club head that present embodiment is related to is illustrated.At first, wrought iron or ferroalloy are forged or casts, as a whole 2 moulding of caput framework.At this moment, in the inner face 2e of caput framework 2, form step discrepancy in elevation 2f and 2g.On the other hand, adopt etch processes, finedraw processing, coating processing, ion plating processing or coating, or, plate surface is decorated processing, material 11 inside making the method that these methods make up.Then, the inside material 11 is assemblied in step discrepancy in elevation 2g in the peristome 3.At this moment, the dorsal surface of handling through decoration in the inside material 11 of showing out caput framework 2.Then, intermediate materials 10 is assemblied among the step discrepancy in elevation 2g, makes to overlap on the material 11 of the inside.

On the other hand, the sheet material of the thickness 0.6～2.5mm that is formed by Cr-Mo steel, マ レ-ジ Application ゲ steel or SUP is processed into the regulation shape, after imposing the surface treatment of regulation on the surface, forms line of weakness 7, make surfacing 4 on this surface.Secondly, surfacing 4 is assemblied in the step discrepancy in elevation 2f, facing to caput framework 2, adopts the end of surfacing 4 laser weld or electron beam welding to weld.Whereby, the backing material 5a that the inside material 11 and intermediate materials 10 constitute is by caput framework 2 and surfacing 4 clampings.Like this, can make the iron golf club head that present embodiment relates to.

In the present embodiment, backing material 5a is formed by the inside material 11 and intermediate materials 10, so the surface portion of iron golf club head is the 3-tier architecture that is made of surfacing 4, intermediate materials 10 and the inside material 11.Therefore, compare with above-mentioned the 1st embodiment, the elastic deformation amount of surface portion becomes bigger, can be higher to the resilience of playing ball.In addition, by the mutual 3 blocks of different sheet materials of material are made up, can adjust caput intensity, the coefficient of resilience, the sensation when playing ball etc. in the larger context, the design freedom of caput increases.

In addition, handle, make the design of dorsal surface of caput higher by imposing on the material 11 inside to decorate.Whereby, can improve the added value of commodity.In addition, to the inside material 11 impose decorate to handle after, the inside material 11 is installed on the caput framework 2, before being assembled on the caput, impose to decorate and handle.At this moment, can suppress to handle the manufacturing cost increasing that causes, can realize the good high added value commodity of design with low cost because of decorating.Above-mentioned effect in addition in the present embodiment, same with the effect of above-mentioned the 1st embodiment.

Embodiment

To effect of the present invention,, be specifically described below to compare with claim of the present invention comparative example in addition.

The 1st test example

Fig. 4 A is the profile of the related iron golf club head of the embodiment of the invention, and Fig. 4 B is the related iron golf club head profile of comparative example.At first, the iron golf club head shown in shop drawings 4A and Fig. 4 B.Shown in Fig. 4 A, the structure of the iron golf club head 12 that the embodiment of the invention is related, identical with above-mentioned the 1st embodiment, surfacing 4 is that the high tension steel by thickness 1.0mm forms, backing material 5 is that the FRTP laminated material by thickness 3mm forms.That is, the thickness of surface portion 13 adds up to 4mm.Also have, in the iron golf club head 12 shown in Fig. 4 A, as the FRTP laminated material, use be material by 12 layers of carbon fabric and Merlon sheet stock alternatively laminateds.In addition, caput framework 2 is formed by the wrought iron S-20C of carbon containing (C) 0.2 quality %.The inclination angle of iron golf club head 12 is 21 °, caput quality 242g.

In addition, shown in Fig. 4 B, the iron golf club head 14 that comparative example is related forms an integral body by S-20C.The thickness of the surface portion 15 of this iron golf club head 14 is 4mm.The inclination angle of iron golf club head 14 is 21 °, caput quality 242g.

Secondly, use the golf club of having equipped iron golf club head 12 and 14 to carry out reality and play test.In these golf clubs, the part beyond the caput is used identical material.That in addition, ball uses is B/S new (ニ ュ-ィ Application Network).Also have, the weather during test is fine, calm.This actual result of the test of playing ball is shown in table 1 and table 2.Table 1 expression embodiments of the invention result of the test promptly, is used the result of the test of iron golf club head 12, and the result of the test of table 2 expression comparative example promptly, is used the result of the test of iron golf club head 14.

Table 1

	??No.	Caput speed (m/ second)	The initial velocity of ball (m/ second)	Chop (rpm)	Flying distance		Rolling distance		Total flying distance
											(sign indicating number)	??(m)	(sign indicating number)	????(m)	(sign indicating number)	????(m)
					Embodiment	??1	????39.5	??55.5	??2630	????194							??177	????18	????16.5	????212	????194
??2	????28.5	??54.6	??2780	????192							??176	????12	????11.0	????204	????187
						??3	????39.2	??54.7	??3210	????194						??177	????13	????11.9	????207	????189
??4	????39.0	??54.1	??2700	????192							??176	????15	????13.7	????207	????189
						??5	????40.0	??56.4	??2610	????201						??184	????14	????12.8	????215	????197
??6	????39.5	??52.1	??2470	????183							??167	????18	????16.5	????201	????184
						??7	????39.3	??56.0	??2540	????202						??185	????16	????14.6	????218	????199
??8	????39.1	??55.2	??2360	????191							??175	????20	????18.3	????211	????193
						??9	????40.0	??55.4	??2470	????199						??182	????16	????14.6	????215	????197
??10	????40.1	??55.1	??2710	????199							??182	????12	????11.0	????211	????193
						Mean value		????39.42	??54.9	??2648						????194.7	??178.0	????15.4	????14.1	????210.1	????192.1

Table 2

	??No.	Caput speed (m/ second)	The initial velocity of ball (m/ second)	Chop (rpm)	Flying distance		Rolling distance		Total flying distance
											(sign indicating number)	????(m)	(sign indicating number)	??(m)	(sign indicating number)	??(m)
					Comparative example	??11	??39.3	??52.6	??2590	????185							????169	????14	??12.8	??199	??182
??12	??39.3	??53.0	??2496	????183							????167	????15	??13.7	??198	??181
						??13	??38.5	??54.8	??2440	????188						????172	????17	??15.5	??205	??187
??14	??39.5	??53.2	??2780	????184							????168	????16	??14.6	??200	??183
						??15	??38.9	??55.9	??2090	????183						????167	????20	??18.3	??203	??186
??16	??39.7	??55.3	??3010	????196							????179	????12	??11.0	??208	??190
						??17	??40.4	??55.2	??2510	????193						????176	????17	??15.5	??210	??192
??18	??39.3	??52.6	??2430	????180							????165	????19	??17.4	??199	??182
						??19	??39.6	??54.6	??2330	????190						????174	????18	??16.5	??208	??190
??20	??39.4	??55.2	??2180	????186							????170	????19	??17.4	??204	??187
						Mean value		??39.40	??54.0	??2486						????186.8	????170.5	????16.7	??15.2	??203.4	??185.7

Shown in table 1 and table 2, when using the iron golf club head 12 that the embodiment of the invention relates to, compare during with use iron golf club head 14 that comparative example relates to, caput speed is identical, but because good to the resilience of ball and the rotatory that has, the initial velocity average out to 54.9m/ second of ball is than the average big 0.9m/ of the initial velocity (54.0m/ second) of comparative example ball second, caput rotation number average out to 2648rpm is than the big 162rpm of rotation number (average 2486rpm) of comparative example.The result is, flying distance in the embodiment of the invention (average 178.0m), than the average big 7.5m of flying distance (average 170.5m) of comparative example, total flying distance of embodiment (average 192.1m) is than the average big 6.4m of total flying distance (average 185.7m) of comparative example.On the other hand, the rolling distance of embodiment (average 14.1m) is than the on average short 1.1m of rolling distance (average 15.2m) of comparative example.In addition, embodiments of the invention are compared with comparative example, ball get the angle height.Also have, when generally using wood, when ball initial velocity greater than 1m/ during second, flying distance increases by 5～10 yards.Also can consider equally the iron golf club head.

The 2nd test example

Play ball part (surface portion) thickness of face of formation is made 5 at the mutual different iron golf club head of 2～6mm scope.Its surface portion is made of 2 blocks of sheet materials of surfacing and backing material, the gross thickness of these 2 blocks of sheet materials, each caput difference.That is, the structure of these caputs, the caput structure of using in the example with the 1st test that is shown in Fig. 4 A is similar, and still, the thickness of slab of surfacing and backing material is not limited to measure-alike with shown in Fig. 4 A.Employed caput in this 2nd test example, total thickness of slab of its surfacing, backing material is shown in table 3.Golf club with these caputs of equipment is played ball, and surveys its initial velocity.Play ball with machinery, caput speed reaches the level of 30m/ second and 40m/ second.

Table 3

	????No.	The thickness of slab of surfacing (mm)	The thickness of slab of backing material (mm)	Total thickness of slab (mm)
					Embodiment	????21	????1	????1	????2
????22	????1	????2	????3
				????23		????1	????3	????4
????24	????1	????4	????5
				????25		????1	????5	????6

The abscissa of Fig. 5 is the rigidity of surface portion, and ordinate is an initial velocity of getting ball, and the rigidity of presentation surface part is to getting the initial velocity influence of ball.The abscissa of Fig. 5 is for forming the Young's modulus E (kg/mm of surface portion material ²), the thickness of slab of surface portion is during with t (mm) expression, obtains E * t ³(kgmm) value.The index of this value representation amount of rigidity.In addition, the result of the test of the expression caput speed 40m/ of the stain (●) among figure during second, the result of the test of black triangle (▲) expression caput speed 30m/ during second among the figure.Also have, the numeral among the figure is total thickness of slab of surface portion.

As shown in Figure 5, the thickness of slab of surface portion is thinner, and the rigidity of surface portion is lower, and it is soft that surface portion becomes, and the elastic deformation amount strengthens, and to the resilience increase of ball, the initial velocity of ball strengthens.Therefore, the flying distance of ball increases.When initial velocity increases 1m/ second, the flying distance of ball increases 4.7m.

Effect of the present invention

As detailed above, according to the present invention, the surface portion of iron golf club head forms by 2 blocks of sheet materials by surfacing and backing material, and the rigidity of surface portion reduces, and to lengthening the time of contact of playing ball, the resilience of playing ball is increased when playing ball. Therefore, the initial velocity of playing ball increases, and flying distance prolongs. In addition, because surfacing forms by metal or alloy, so traumatic resistance and the rotatory when playing ball are good, because surfacing is welded on the caput framework, can obtain the iron golf club head that intensity is high, durability is good of caput.

Claims (10)

1. iron golf club head, it is characterized in that, wherein contain: at the surperficial upper shed that constitutes by the metal or alloy above-mentioned face respective regions (2c) and be welded in the above-mentioned caput framework (2) and the fixing surfacing (4) that is made of metal or alloy contacts with dorsal surface with above-mentioned surfacing (4) and be configured in backing material (5) on the above-mentioned caput framework (2) of playing ball of caput framework (2), the lining of face respective regions (2c) and back side respective regions (2d) of playing ball.

2. according to the iron golf club head described in the claim 1, it is characterized in that the end of above-mentioned backing material (5) embeds in the above-mentioned caput framework (2).

3. according to the iron golf club head described in the claim 1, it is characterized in that the proportion of above-mentioned backing material (5) is below 4.4.

4. according to the iron golf club head described in the claim 1, it is characterized in that above-mentioned backing material (5) is overlapping and form by multi-sheets.

5. according to the iron golf club head described in the claim 4, it is characterized in that above-mentioned backing material (5) is overlapping and form by 2～5 blocks of sheet material.

6. according to the iron golf club head described in the claim 1, it is characterized in that above-mentioned backing material (5) is to constitute by being selected among CFRP, GFRP, CFRTP, Mg alloy, Al alloy, Be alloy and the FRM a kind or 2 kinds or above material.

7. according to the iron golf club head described in the claim 1, it is characterized in that, handle at the enterprising luggage decorations of the dorsal surface of above-mentioned backing material (5).

8. according to the iron golf club head described in the claim 1, it is characterized in that it is a kind or 2 kinds or the enforcement of above method that is selected from etch processes, finedraw processing, electroplating processes, ion plating processing and the coating that above-mentioned decoration is handled.

9. according to the iron golf club head described in the claim 1, it is characterized in that above-mentioned caput framework (2) and above-mentioned surfacing (4) weld by laser weld or electron beam welding connection.

10. according to the iron golf club head described in the claim 1, it is characterized in that the thickness of above-mentioned surfacing (4) is 0.6～2.5mm.

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