CN1826156A - Golf club head - Google Patents

Abstract

A golf club head, wherein the hard peening of 0.30 to 0.80 mmA in arc height value is applied to the rear surface of a face part to remain a large compressive stress in the rear surface of the face part, whereby the maximum stress produced in the rear surface of the face part when a ball is hit can be lowered and such effects as to prevent the fatigue, rupture, and deformation of the face part can be provided. Shot materials formed in a spherical shape with a diameter of 1 to 3 mm are suitably used for the peening. By this invention, the face part of the golf club head can be thinned and accordingly the repulsion and the inertia moment of the golf club head can be increased, and the gravity center thereof can be optimized. As a result, a golf club with excellent carry and directivity can be provided.

Description

Glof club head

Technical field

The present invention, relevant metal glof club head.

Background technology

All the time, we think, carry out bead by the inner face at glof club head, can residual stress and remove descale to improve fatigue strength.For example, the spy of Japan open 2003-10366 communique etc. put down in writing.

But, distinguish according to inventor's etc. research, only implement bead and often can not get effect, become on the contrary according to different condition and cause reason of fatigue destruction.Specifically, when carrying out the general steel sand bead of the not enough 0.3mmA of camber value, fatigue strength does not improve.In addition, distinguished the situation that causes striking surface to scratch because of shot-peening, can predict that this may become making a start of fatigue rupture.

In addition, also distinguish and to cause the disadvantageous distortion of member by shot-peening, or cause that from shot-peening trickle scar causes fatigue rupture.When carrying out the camber value when surpassing the hard steel sand shot-peening of 0.8mmA, shot-peening will cause the distortion that member is bigger, damage the function of glof club head and attractive in appearance etc., in fact make the manufacturing difficulty of golf clubs.

The present invention, in light of this situation, with provide make preventing of utilizing that bead brings bat facial tired, destroy, the effect of distortion becomes actual effect, and wall is thinner and bounce-back property height, moment of inertia are big, flying distance and all excellent glof club head of directionality.

Summary of the invention

The glof club head that the present invention is correlated with is characterized in that, it is the hard bead of 0.3mmA to 0.8mmA that the camber value has been carried out at the back side of striking surface.When using the steel sand material of solid to carry out the steel sand shot-peening, it is that the spheroid of 1～3mm is more satisfactory that the steel sand material should use acerous shape and diameter.Except steel sand shot-peening method, the laser peening method is also more suitable.Bead should be at least carried out bead to the central portion at the striking surface back side.

Utilize above-mentioned means, can obtain following effect.

1. because the camber value is carried out at the striking surface back side is hard bead more than the 0.3mmA, so the residual bigger compression stress of striking surface back side portion.

2. during the steel sand shot-peening, has the steel sand material of no angular shape, so can prevent from surperficially to scratch because of bead owing to use.

3. though material surface has rolling grade to add the fine scar of the strip that produces man-hour, but through bead, eliminates the fine scar of this strip.But, when the steel sand material diameter is 1～3mm during the steel sand shot-peening.

Since the camber value less than 0.8mmA, so can control the deformation of members that shot-peening produces.By being only limited to the striking surface central portion is carried out bead, can further make deformation of members control minimum.

The batting face of golf clubs, its back side is subjected to bigger tensile stress effect when impacting, and as described in above-mentioned 1, glof club head of the present invention is residual compression stress at the striking surface back side, so tensile stress and compression stress offset, the stress that produces when impacting is reduced.And then, as described in above-mentioned 3, eliminated the fine scar on the surface that material has at first, can become the key element that fatigue rupture is made a start thereby eliminated.Thus, glof club head fatigue strength of the present invention is high and be difficult to produce the permanent deformation that causes when impacting., because of shot-peening causes new fine scar, then produce the opposite effect possibly.Therefore, as described in above-mentioned 2, when the steel sand shot-peening might cause fine scar, should use acerous steel sand material, the optimal steel sand material that is to use spheroid prevents that with this it from occurring.

Utilize words of the present invention, can further make thin-walled to glof club head, utilize it can improve bounce-back, increase moment of inertia, position of centre of gravity is rationalized more.

The accompanying drawing simple declaration

Fig. 1, Fig. 2 are the stereograms that is suitable for very much an example of wooden club head of the present invention, and symbol 1 is that striking surface, symbol 2 are a body.In addition, shared these symbols among all figure below.

Fig. 3 is the stereogram that is suitable for very much an example of iron club head of the present invention.

Fig. 4 is other examples that are suitable for very much wooden club head of the present invention, is the stereogram with example of the extension that extends from striking surface upward and downward rear.

Fig. 5 is other examples that are suitable for very much iron club head of the present invention, is the stereogram with example of the extension that extends from striking surface upward and downward rear.

Fig. 6 is a front view of using striking surface 1-T for the test that checking effect of the present invention is used with a body 2-T and test.

Fig. 7 is that the expression ball impacts in the test camber value and striking surface and destroys the figure that impact the number relation.

Fig. 8 is the figure that the expression ball impacts striking surface depressed deformation magnitude relation behind camber value in the test and 1000 dozens.

Fig. 9 is the general remark figure of steel sand shot-peening, the figure of its expression steel sand material 3 and workpiece 4 crash situation.When carrying out the steel sand shot-peening among the present invention, workpiece 4 is equivalent to striking surface 1.

The specific embodiment

At first, with regard to the general effect of bead, describe with steel sand shot-peening situation.The steel sand shot-peening as shown in Figure 9, makes the near surface local deformation of workpiece 4 by the bump of steel sand material 3.By clashing into repeatedly, near the striking face of workpiece 4, at the wall thickness direction and the striking face direction residual compression stress of workpiece 4 with a large amount of steel sand materials 3.As a result, the stress that the striking face direction of workpiece 4 produces, roughly become the striking face face side greatly, to the inside more little more distribution.See that in detail the residual stress maximum is not the surface, but from inner side surface a bit, about this point, the back will be described in detail.The also almost residual same stress of other ball blasting methods.

Summary when then golf clubs of the present invention being made describes.The present invention is applicable to the glof club head of all shapes and structure, but the very suitable glof club head that on a body 2 of forming with upper member by one or two, engages the structure of striking surface 1 shown in Fig. 1～5.This is because be the member that separates with a body 2 owing to have the striking surface 1 at the striking surface back side of carrying out bead, so carry out bead easily.And then striking surface 1 adopts high-strength material, adds effect of the present invention, thereby also can further realize high strength.

The operation that a striking surface 1 and a body 2 engage is adapted at carrying out after the bead.This is because as mentioned above, owing to can carry out bead under the state of striking surface monomer, become easy so handle.In addition, can also prevent to cause unnecessary deformation to partly not carrying out bead.And most importantly it can also carry out the joint operation of a striking surface 1 and a body 2 before bead.For example, have in the part of a body 2 and offer peristome, the method for handling by this peristome.But the structure of a body 2 is often very complicated.On the other hand, also have can get rid of because of glof club head the heat of the welding of common joint cause the effect of the possibility of forfeiture effect of the present invention, should consider to select with the equilibrium of other key elements.

Below just effect of the present invention is disappeared because of heat situation, and the joint of a striking surface 1 and a body 2 describes.As everyone knows, it organizes metal material Yin Wendu and changes, and heat treatment utilizes this characteristic exactly.Tissue changes, residual stress relieved.Making the temperature of residual stress forfeiture, can be yardstick with the recrystallization temperature of metal material.Therefore, need the part of the effect of bead, temperature is controlled at recrystallizes below the temperature.It is different because of metal species to recrystallize temperature, and for the stainless steel that uses for glof club head, Maraging steel, the titanium alloy, its temperature is approximately 300 ℃, and is lower.

Therefore, when making glof club head of the present invention,, also can think more satisfactory if can take following measure.

Making does not need the golf rod-shape that engages

Do not need perhaps to select the joint that heats

Perhaps before bead, engage

When making the shape that does not need to engage, then do not need to consider bond strength, it is extremely easy to make.But the shape of golf clubs significantly is restricted, and can only be applicable to the golf clubs of only a few kind.Can not make the hollow type glof club head of general so-called wooden shot bar and cored iron club.The back side recess of the bag of manufacturing what is called in addition, sections club is that the glof club head of recessed structure is also very difficult.

As not needing to heat the example that engages, can consider this class mechanical type joint method or bonding of riveted joint, pin and screw fixed.It is no doubt fine not need to heat this point, but exists the problem of bond strength.Being easy to generate the gap also is difficult point with loosening the grade.

The method that before bead, engages, as previously described.

Consider above situation, the inventor etc. think, compare with above-mentioned three kinds of methods, and the method that engages with various weldings after bead is real.This thinks method that the method that engages before the bead is improved.In view of this technology is that joining technique with when invention is a prerequisite, so scope of the present invention is not limited to these.

Below, the welding means that engage after the bead of being adapted at are described.The joint method that only very low range is heated of laser weld and electron beam welding and so on is the most suitable.These joint methods are owing to only heat the junction surface effectively, so the heat of arrival bead portion seldom, so the temperature rising of bead portion is controlled at minimum.But, even so, because the temperature of bead portion still rises, so preferably take the measure of anti-temperature rise simultaneously.For example, and meanwhile bead portion on one side the blowing cooling gas method of welding, make bead portion contact method that radiating component welds etc.If can improve these coolings and heat-sinking capability, also can select general TIG weldering (tungsten arc inert-gas welding (TIG welding)) etc. for use.In addition, from preventing the viewpoint of junction surface and oxidation on every side thereof etc., refrigerating gas preferably uses inert gas.

Laser weld and electron beam welding, owing between the member that necessarily requires to engage less clearance is arranged, it is more satisfactory that machining is carried out in the both sides bonding part.

Utilize the member shape of glof club head, also can prevent heat conduction to bead portion.Such as, can enumerate striking surface 1. because the central authorities of the striking surface that needs most the bead effect are departed from the junction surface with the extension that extends from the upward and downward rear shown in Fig. 4,5, so the amount that the heat when engaging is conducted is less, thereby can reduce the temperature rise of this part.

In addition, when the minimizing of above-mentioned shot blasting effect and disappearance are not limited to engage, because relevant with all processing after the bead, so, particularly near the central authorities for striking surface 1, can not carry out the heat treatment of temperature above 300 ℃ etc.Therefore, when needing heat treatment, should before bead, carry out.Certainly, be no more than 300 ℃ K cryogenic treatment, also can after bead, carry out.

Thus, it is as follows that the inventor waits the of the present invention best example of considering:

As header structure, adopt striking surface 1 with the extension that extends from the upward and downward rear shown in Fig. 4,5.

In advance striking surface 1 is heat-treated.

Then, the bead that the camber value is 0.3mmA to 0.8mmA is carried out at the back side of striking surface 1.

The method of shot-peening is, having used diameter is the steel sand shot-peening or the laser peening of steel sand material of the spheroid of 1～3mm.

Before or after the bead, machining is carried out in the bonding part of a striking surface 1 and a body 2, to reduce the gap at junction surface.

And then, then engage with laser weld or electron beam welding again.

During above-mentioned welding, at bead portion blast-cold but inert gas on one side weld on one side.

Result when shown below is enforcement such as inventor and advance copy invention.

In order to confirm the effect of shot-peening, use shown in Figure 6 to impact golf with screw fixed test on the body 2-T repeatedly with the glof club head of striking surface 1-T in test, impact number when deflection after write down 1000 dozens and destruction.Speed when impacting in addition, is 40m/sec.

Test is that the outside is that 90mm * 70mm, inboard are the frame of 70mm * 40mm with a body 2-T, and is provided with the eck that vertical angle is 15 ° a long handle installation usefulness at sidepiece.In addition, at four jiaos of screwed holes that are set to fixation test with striking surface 1-T.Test is and the sheet material of test with the identical 90mm * 70mm of the profile of a body 2-T that wall thickness is about 2.2mm with striking surface 1-T.In addition, do not carry out the steel sand bead with ultrasonic wave steel sand shot-blast unit almost evenly with the rear side of the central portion that body 2-T a contacts 70mm * 40mm part, screw is used on the body 2-T to be fixed on test by the hole of being located on four jiaos with test.

Test is the rolling stock with titanium alloy of 13V-11Cr-3Al composition with first test material of striking surface 1-T.Second test material is the rolling stock with titanium alloy of 15V-6Cr-3Al composition, and the 3rd test material is the Ageing Treatment material with titanium alloy of 15V-3Sn-3Cr-3Al composition.They are carried out the steel sand bead of different camber values.

Experimental result is shown in table 1～3 and Fig. 7,8.In table 1～3, destroying and beating number is the number of testing when using striking surface 1-T to destroy of beating.Deflection after 1000 dozens, expression be the test that is initially the plane with the take taxi amount of central portion depression after impacting for 1000 times of hitting of striking surface 1-T.In addition, comparative example 1-1,2-1,3 camber value are 0.00mm, but this means and do not implement bead.The actual measurement wall thickness is the wall thickness of surveying behind the steel sand shot-peening, is the mean value that the many places test is measured with the wall thickness of striking surface 1-T.The camber value is its test have been implemented the value of bead with striking surface 1-T.Use the diameter of steel sand material diameter as the steel sand material of steel sand shot-peening use.Fig. 7, the 8th, at every kind of material with the camber value respectively to destroy beat several and 1000 dozens after the figure that obtains after drawing of deflection.

Table 1

	Comparative example 1-1	Comparative example 1-2	Embodiment 1-1	Embodiment 1-2	Embodiment 1-3
						Material	Ti-13V-11Cr-3Al
Rolling stock
					Actual measurement wall thickness (mm)		2.23	2.19	2.27	2.24	2.04
Haughty and aloof value (mmA)	0.00	0.20	0.40	0.40		0.66
					Use steel sand material diameter (mm)		-	0.6	1.2	2.0	2.0
Destroy and beat number (beating)	1262	1301	2846	2884		3000
					Deflection after 1000 dozens (mm)		0.24	0.17	0.08	0.05	0.05

Table 1 is the experimental result of above-mentioned first test material.Comparative example 1-2 camber value is 0.20mmA, as the bead that glof club head is carried out, in existing well-known method, belongs to great bead.But,, do not see that fatigue strength makes moderate progress just to go to pot with the comparative example 1-1 that the does not carry out bead number of beating much at one.On the other hand, carry out the camber value be 0.40 and embodiment 1-1～3 of this very strong bead of 0.66mmA in, destroying and beating number is more than times of comparative example 1-1～2, fatigue strength obviously improves.Even the deflection behind 1000 dozens of the more clear expression of Fig. 7 is compared, embodiment also improves than comparative example.

Distinguish according to above, in this test, aspect improving fatigue strength and preventing two of permanent deformation, the big more then effect of camber value manifests more, particularly aspect raising fatigue strength, exist camber value 0.20mmA and 0.40mmA gauge,, then can not get corresponding effect if the camber value is not got the above value of these values.

Table 2

	Comparative example 2-1	Comparative example 2-2	Embodiment 2-1	Embodiment 2-2
						Material	Ti-15V-6Cr-3Al
Rolling stock
					Actual measurement wall thickness (mm)		2.20	2.19	2.27	2.26
Camber value (mmA)	0.00	0.20	0.40	0.66
					Use steel sand material diameter (mm)		-	0.6	1.2	2.0
Destroy and beat number (beating)	1654	2197	3000	3702
					Deflection after 1000 dozens (mm)		0.16	0.17	0.10	0.05

Table 2 is experimental results of above-mentioned second test material.If see deflection after 1000 dozens, then identical when the camber value is 0.20mmA with the situation of not carrying out bead, but when the camber value be 0.40mmA when above, then deflection obviously reduces, and has gauge betwixt.Can further to define this relation from Fig. 8.As shown in Figure 7, beat that several though do not find the critical gauge of camber value, the camber value is big more down destroying, then destroy beat count high more, thereby the fatigue strength raising.

Distinguish according to above, in this test, aspect improving fatigue strength and preventing two of permanent deformation, the big more then effect of camber value manifests more, particularly preventing aspect the permanent deformation, exist camber value 0.20mmA and 0.40mmA gauge,, then can not get corresponding effect if the camber value is not got the above value of these values.

Table 3

	Comparative example 3	Embodiment 3
						Material	Ti-15V-3Sn-3Cr-3Al
The Ageing Treatment material
					Actual measurement wall thickness (mm)		2.23	2.17
Camber value (mmA)	0.00	0.60
					Destroy and beat number (beating)		1537	2370
Deflection after 1000 dozens (mm)	0.12	0.05

Table 3 is experimental results of above-mentioned the 3rd test material.This example is when carrying out bead and carries out the comparison of camber value when being the 0.60mmA bead, when having carried out bead, destroy the deflection beat behind number and 1000 dozens and all improve, confirmed the present invention at raising fatigue strength with prevent effect aspect the permanent deformation.

As mentioned above as can be known, use the glof club head of general material, the fatigue strength and prevent that the gauge of the camber value of this two aspects effect of permanent deformation from being between 0.20mmA and the 0.40mmA of can being improved really, i.e. camber value 0.30mmA.

On the other hand, the stress that this part is residual has produced the moment of the direction parallel with the bead face, and bead face side becomes the distortion of projection, and warpage has taken place.This is because because this warpage, near the compression stress the striking face side reduces, and produces tensile stress near opposing face, so above-mentioned moment is zero stablizing.That is to say that as long as make near the compression stress of a side residual the direction of face, warpage is inevitable.In addition, so-called bead portion is meant the entire portion because of the bead residual stress, and so-called bead face is meant the surface of having implemented to handle side in the bead portion.

The inventor etc., with table 1～3 material of being put down in writing and conditions, also attempting having carried out the camber value is the steel sand shot-peening of 0.80mmA, because the steel sand shot-peening, bigger warpage takes place with striking surface 1-T in test, can not impact test.The striking surface of glof club head, during for wooden club head outer for protruding, must be the plane during for the iron club head, yet when bead is carried out at the back side of striking surface 1, because warpage takes place in the direction that makes the striking surface depression, so warpage is bigger, can not bring into play function as glof club head.That is to say that the stress residual by bead is big more, just can make the Stress Control that takes place when impacting less more, the warpage of striking surface also becomes greatly simultaneously, thereby exists the problem that golf clubs is made difficulty.As mentioned above, the camber value is that the test of 0.66mmA keeps sufficient flatness with striking surface 1-T, can be installed in test with impacting on the body 2-T.Can be thought that by above result when the camber value is 0.80mmA when above, the use of actual head is very difficult, the camber value should be below the 0.80mmA.

But, also have in advance and test, measure the deflection of shot-peening, striking surface 1 is configured as the shape of having considered its distortion carries out bead again, with the method for the striking surface 1 that obtains desired shape.When needs when to carry out the camber value be bead more than the 0.80mmA, harder,, when needing more high-precision striking surface 1, can use this method though perhaps be lower than this camber value.When the camber value is lower than 0.80mmA, do not need to carry out pilot study and shaping.

Below, describe bead in detail.At first, as mentioned above,, then can reduce maximum stress because the bead residual compression stress is implemented bead so produce the position of tensile stress when impacting.Opposite if bead is carried out at the position that compression stress takes place, the compression stress that produces of bead and impact the compression stress addition that causes makes maximum stress become big so, thereby promotes tired and may cause destroying.Though we know that the face side of the striking surface 1 that pair glof club head is arranged carries out the glof club head of bead,, be careful so tackle this because this is the situation of its opposite effect just.If the face side of striking surface 1 is carried out bead, at most just, only limit to the minimum processing of residual stress in order to remove the purpose of descale etc.

In addition, in view of bead produces distortion,, only when impacting, handle optimum near the central authorities at the striking surface back side of the big tensile stress of generation so process range preferably is controlled at necessary minimum degree.Owing to the scope that big tensile stress takes place is different because of the shape of glof club head and striking surface 1, so wish by individually definite process range such as FEM simulate.As basis of reference roughly, to being that to carry out bead about the oval scope of the horizontal 3cm at center, vertical 2cm best with striking surface central authorities.

As mentioned above, the method for bead except the steel sand shot-peening, also is fit to laser peening.Laser peening is exactly to the material surface irradiating laser, and the plasma of the high pressure that takes place by material ablation produces high momentum, utilizes this momentum residual stress.General laser peening, can be residual than the steel sand shot-peening stress of deep layer more, can make fatigue strength higher.In addition, owing to do not use the steel sand material, bring harmful effect so also needn't worry the depression that the steel sand material causes.

During the steel sand shot-peening, ultrasonic wave steel sand shot-peening is favourable.This is because the grain number of steel sand material is fewer, and exchange easily, obtains the cause of shiny surface easily.Air type steel sand shot-peening uses a large amount of high price particles, and the new circularity of particle is damaged when using for a long time, is difficult to obtain stablizing smooth surface, and this point is disadvantageous.In addition, also have and the steel sand material method of atomizing of liquids simultaneously.Be called wet blasting, water shot-peening or water spray steel sand shot-peening.

During the steel sand shot-peening, the hardness of the steel sand material 3 of use need be harder than the material of striking surface 1.Wait in the above-mentioned test carry out inventor, use be high-carbon-chromium bearing steel SUJ2.Its hardness is about Hv790, and is all harder with the hardness (being roughly about Hv350) of the various titanium alloys of striking surface 1-T use than test.This be because, if the hardness of steel sand is less, even can not produce sufficient local deformation with striking surface 1 bump, thereby can residual compression stress.

In addition, steel sand material 3 should use the to a certain degree above steel sand of size.As mentioned above, the present invention also has the effect of eliminating the fine scar of bead face.This fine scar is the scar of the strip that produces because of the rolling grade of metal material.This is because steel sand material 3 is less, can not eliminate this fine scar fully.In addition, and also because, the steel sand shot-peening is owing to can form the depression that invar sand material 3 causes, so steel sand material 3 is less, it is also less to cave in, and itself probably can become making a start of fatigue rupture its depression.In inventor's etc. test, use diameter as the ball more than the 1mm as steel sand, then can eliminate above-mentioned fine scar fully, and the depression that steel sand material 3 causes can not become making a start of fatigue rupture.Can think that thus steel sand material 3 should be acerous shape and uses to a certain degree bigger steel sand, diameter is that the above spheroid of 1mm is more satisfactory.

Yet, consider to can be used for the shot-blast unit that glof club head is handled at present that the steel sand material diameter upper limit should be 3mm.This be because, greater than this upper limit, the steel sand material weight increases the weight of, shot-blast unit can not make the steel sand material fully quicken, and can not get necessary camber value.

The example that is more suitable for regard to relevant shot-peening describes below.At first, the method for carrying out bead for twice is arranged.After carrying out bead at first, carrying out more steady than the first time again is the less bead second time of camber value.By bead, hardness is bigger, and the position of stress-retained maximum is not the surface, but is positioned at the inboard slightly.But the maximum tensile stress happening part is the surface when impacting, so if possible, wishes to improve the hardness and the residual stress on surface.Therefore, increase soft shot-peening a little and will realize this effect.

In order to prevent that the depression that above-mentioned steel sand material causes from becoming making a start of fatigue rupture, it prevents that measure from having the method for coated with resins on the bead face.Resin preferably uses epoxy system, and mixed metal powder is also most suitable therein.This is because by adding resin at the above-mentioned recess as little scar shape, can prevent notch effect.

The present invention also is fit to use simultaneously nitrogen treatment.As mentioned above, the residual stress of steel sand shot-peening is owing to be limited to more shallow layer, so the stress that impacts generation greatly the time, residual stress is often insufficient.Nitrogenize is owing to forcing to make nitrogen-atoms or molecule to infiltrate in the metal structure, so produce residual stress.And,, residual stress is produced in the darker layer because nitrogen enters into the darker layer of layer that relates to than steel sand shot blasting effect.But, because the amount of the nitrogen-atoms that infiltrates etc. is limited, so the residual stress that produces is also limited.On the other hand, because of impacting the tensile stress back side maximum that causes that striking surface 1 takes place, and it is more little arrive the inboard more, is zero near the central authorities of wall thickness.Residual stress so make the stress-retained deep layer that arrives by nitrogenize, utilizes bead further to improve near the residual stress in the back side owing to can produce in advance with to this counteracting.

As mentioned above, recrystallize temperature because temperature surpasses, residual stress disappears, thus preferably carry out nitrogenize earlier, after carry out bead.But, if the low temperature nitriding method of promoting the use of recently also can carry out after bead.About this low temperature nitrogenize being applied to the situation of golf clubs, the Japan that hope proposes with reference to the present patent application people speciallys permit out hope 2003-121259 number specification and accompanying drawing.

In addition, also be adapted at Fu Lelin such as mixed C 60 and C70 (fullerene) class in the steel sand material 3, carbon nanotube (carbon nanotube) or millimicro diamond millimicro order of magnitude materials such as (nano diamond) and carry out the steel sand shot-peening.This is because during the steel sand shot-peening, millimicro order of magnitude material is invaded in the metal material, can improve intensity thus.In addition, about the content that utilization has mixed the metal material manufacturing glof club head of millimicro order of magnitude material, wish to specially permit out the specification and the accompanying drawing of hope 2000-190192 number (spy of Japan opens the 2002-000778 communique) with reference to the Japan that the present patent application people proposes.The millimicro diamond, comprising by diameter is that monocrystalline diamond about 5nm or diameter are the polycrystalline structure diamond that form or boundlingization about 15nm.

In addition, much less glof club head of the present invention, is not limited to above-mentioned example, in the scope that does not exceed purport of the present invention, can add various changes.

Utilize possibility on the industry

As mentioned above, the glof club head that the present invention is correlated with, can make striking surface make thin-walled, and raising bounce-back property, increase moment of inertia, position of centre of gravity is rationalized more, can provide the flying distance of playing ball, directionality and for golfer's operability excellent golf clubs all with this.

Claims

(according to the modification of the 19th of treaty)

1. (after revising) a kind of glof club head is characterized in that, to the back side of striking surface, is more than the 0.3mmA but the scope of not enough 0.8mmA in the camber value, and enforcement use particle diameter is that steel sand bead or the laser peening that the steel sand material of 1～3mm carries out handled.

2. (revise afterwards) a kind of glof club head, it is characterized in that, the back side to striking surface, utilizing and using particle diameter is the steel sand shot-peening method or the laser peening method of the steel sand material of 1～3mm, in the camber value is more than the 0.3mmA but the scope of not enough 0.8mmA is carried out the bead first time, and then to carry out the bead second time than the little camber value of the camber value first time.

3. (after revising) glof club head as claimed in claim 1 or 2 is characterized in that, finishes joint and processing that heat treatment, welding etc. are carried out along with component high-temperatureization before bead.

Claims (4)

1. a glof club head is characterized in that, it is hard bead more than the 0.3mmA that the camber value is carried out at the back side of striking surface.

2. glof club head as claimed in claim 1 is characterized in that, the use particle diameter is that the steel sand material of 1～3mm carries out bead.

3. glof club head as claimed in claim 1 is characterized in that, only the middle body to the striking surface back side carries out hard bead.

4. glof club head as claimed in claim 1 is characterized in that the camber value is made as not enough 0.8mmA.

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