JP2003325708A - Endurance test apparatus for golf club head, endurance test method for golf club head, and endurance test program for golf club head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an endurance test apparatus for a golf club head to automatically carry out an endurance test with requiring by an observer to always stays at a test site for visual examination and without stop of the test device, provide a method for the endurance test for the golf club head, and provide an endurance test program for the golf club head. <P>SOLUTION: This golf club endurance apparatus 10 comprises a measuring means 11, a memory 15, an input device 17, a display device 19, an air cannon 20, a means 28 for measuring the number of strikes and a stop circuit 32. A golf ball 46 to be discharged from an air cannon 20 strikes a face surface 44 to cause fatigue failure and strike sound by which response characteristic of the face surface 44 is measured. For example, a primary resonance frequency is measured form the number of strikes and strike sounds measured by the measuring device 11. Thus, a fracture start point from which a fracture such as hair cracks on a face rear surface are caused and a complete fracture point from which a crack is caused on the face surface 44 are completely grasped without visual examination. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club head durability test apparatus, a golf club head durability test method and a golf club head durability test for hitting the face surface of a golf club head to evaluate the durability of the golf club head. More particularly, the present invention relates to a golf club head endurance test apparatus, a golf club head endurance test method, and a golf club head endurance test program for automatically evaluating the durability of a golf club head without visual inspection.

[0002]

2. Description of the Related Art At present, the durability of a golf club head is
A golf ball is hit against the face surface of the golf club head to give a hit, or the golf ball is actually hit by a trial hitting robot or the like to give a hit, and the face surface is visually observed every time a predetermined number of hits are given. The surface is checked for cracks and evaluated.

FIG. 12 is a schematic view showing an apparatus for hitting the face surface of a conventional golf club head. Figure 1
As shown in FIG. 2, the device includes a ball ejection device 22,
The so-called air cannon 20 has a ball ejection guide 24 connected to the ball ejection device 22.
Is called. The ball ejection device 22 directs the golf ball 46 into the face surface 44 of the golf club head 42.
And has a compressor for generating compressed air, for example. In FIG. 12, the golf club shaft of the golf club 40 is omitted. The ball injection device 22 hits the golf club head 42 with the golf ball 46 by hitting the face surface 44 of the golf club head 42 at a speed of usually 40 to 65 m / sec. This operation is repeated, for example, the air cannon 20 is stopped every 200 times, and the observer visually observes whether the face surface 44 of the golf club head 42 is cracked. Thus, in the conventional golf club head durability test method, the durability of the golf club head is evaluated.

[0004]

However, in the conventional method for testing the durability of the golf club head using the air cannon 20, the observer cracks the face surface of the golf club head every time a predetermined number of impacts are completed. There is a problem that we have to confirm. In this case, there is also a problem that the tester needs to be stopped as needed in order to visually inspect the face surface of the golf club head after the hit, and the test takes time. As described above, in the conventional durability test method, it is not possible to measure the change in the response characteristics of the face surface of the golf club head at the same time as the impact that causes fatigue fracture, and therefore the durability test takes time.

Also, although the number of hits when the golf club head was completely destroyed due to cracks or cracks on the face surface of the golf club head was known, cracks were generated on the back surface of the face surface of the golf club head. There is also a problem that it is impossible to know the number of hits at the start of destruction. In particular, the number of hits until a crack or crack occurs on the face surface of the golf club head is
Since it varies depending on the type of golf club head, the observer needs to be attached to the test apparatus until the end of the durability test with cracks or cracks caused by hitting.

The present invention has been made in view of the above problems, and a golf club head endurance test for automatically performing an endurance test without an observer always performing visual observation and without stopping the apparatus. An apparatus, a golf club head durability test method, and a golf club head durability test program are provided. Another object of the present invention is to provide a golf club head durability test apparatus, a golf club head durability test method, and a golf club head capable of measuring the number of hits at the time when the fracture starts and at the time when the face surface is cracked and completely destroyed. The purpose is to provide a durability test program.

[0007]

In order to achieve the above object, a first aspect of the present invention is a striking means for intermittently striking the face surface of a golf club head for fatigue damage, and the striking means. A golf club head endurance test device, comprising: a measurement unit that measures the response characteristic of the face surface of the golf club head by the hit, and obtains a change in the response characteristic with respect to the number of hits. It is a thing.

In the present invention, the golf club head has a determining means for determining whether the response characteristic of the face surface is within a predetermined range, and when the response characteristic of the face surface is out of the predetermined range, It is preferable to stop hitting by the hitting means. Further, in the present invention, it is preferable that the response characteristic of the face surface of the golf club head is a resonance frequency of the face surface. In this case, the resonance frequency is, for example, the primary resonance frequency. Further, in the present invention, the measuring means includes a hitting sound measuring means for measuring a hitting sound of the face surface, and a frequency analyzing means for calculating the resonance frequency from the hitting sound measured by the hitting sound measuring means. And the striking to the face surface by the striking means,
It is preferable to hit with a golf ball. Also,
The hitting means is, for example, a trial hitting robot or a ball ejecting means for ejecting a golf ball. In this case, it is preferable to include a display device that displays at least the resonance frequency of the face surface together with the number of hits each time the hit is performed.

A second aspect of the present invention is the step of intermittently giving a hit to fatigue-destruct the face surface of the golf club head; and each time the hit is made, the hit of the golf club head is caused by the hit. A golf club head endurance test method comprising: a step of measuring a response characteristic of a face surface; and a step of obtaining a change in the response characteristic with respect to the number of hits.

In the present invention, a step of determining whether the response characteristic of the face surface is within a predetermined range is provided as a step subsequent to the step of obtaining the change of the response characteristic of the face surface of the golf club head. It is preferable that the hitting be stopped when the response characteristic of the face surface of the golf club head is out of a predetermined range. Further, it is preferable that the response characteristic of the face surface of the golf club head is a resonance frequency of the face surface. In this case, the resonance frequency is preferably a primary resonance frequency.

Further, in the present invention, the step of measuring the response characteristic of the face surface of the golf club head includes the step of measuring the impact sound of the face surface due to the impact, and the resonance frequency from the impact sound. And a step of calculating

Further, according to a third aspect of the present invention, the durability test of the golf club head is performed by controlling a striking means for intermittently striking the face surface of the golf club head by fatigue. Let
A program executable by the computer, causing the computer to create a control signal that strikes the face surface of the golf club head, and supplying the control signal to the striking means; Golf club head durability comprising a step of causing the computer to measure a response characteristic of the face surface of the golf club head due to the hit, and a step of causing the computer to obtain a change in the response characteristic with respect to the number of hits. It provides a test program.

In this case, as a post-procedure for causing the computer to obtain a change in the response characteristic with respect to the number of hits, the computer determines whether the response characteristic of the face surface of the golf club head is within a predetermined range. If the response characteristic of the face surface of the golf club head is out of a predetermined range, it is preferable to stop the hitting by the hitting means.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION A golf club head endurance test apparatus, a golf club head endurance test method and a golf club head endurance test program according to the present invention will be described in detail below with reference to the preferred embodiments shown in the accompanying drawings. To do. FIG. 1 is a schematic view showing a golf club head durability test apparatus according to an embodiment of the present invention. The golf club shaft of the golf club 40 is omitted in FIG.

As shown in FIG. 1, the golf club head durability test apparatus 10 comprises a measuring means 11, a storage unit 15, an input device 17, a display device 19, an air cannon 20 (a hitting means), and the number of hits. It has a measuring means 28 and a stop circuit 32. The air cannon 20 has a ball ejection device 22.
A ball ejection guide 24 attached to the ball ejection device 22 and a counter / ball speedometer unit 26 attached to the ball ejection device 22. This air cannon 20 is a golf club head 4
The face surface 44 of the golf club head 42 arranged to face the ball ejection port 24a formed in the ball ejection guide 24 in order to fatigue-disrupt the second face surface 44.
The golf ball 46 is ejected at a predetermined speed and hits are given intermittently. The ball ejecting device 22 ejects a golf ball at a predetermined speed using, for example, compressed air. The ball ejection guide 24 is for making the golf ball 46 ejected by the ball ejection device 22 collide with the face surface 44 of the golf club head 42, and is made of, for example, a pipe, and the ball ejection port 24a is formed at the end thereof. Has been done.

The counter / ball speedometer unit 26 is
The number of golf balls 46 ejected from the ball ejection device 22 and the velocity of the golf ball are measured. The counter / ball velocity meter unit 26 outputs the number of hits and the ball velocity data to the input unit 18a of the processing device 18. To be done. The hit count measuring means 28 is used for the golf ball 4
6, which measures the number of shots and is connected to the counter / ball speedometer unit 26. As the hit count measuring means 28, for example, measuring sensors are arranged at predetermined intervals along the ejection direction of the golf ball 46. As the measurement sensor, for example, a photoelectric tube 30 can be cited. When the golf ball 46 passes in front of the phototube 30, a trigger signal for processing by the batting sound processing device 18 described later is output. Also, the photocell 30
Two golf balls, for example, are arranged at a predetermined interval. Therefore, due to the time difference between the passage times of the photocells 30, the golf balls 46
The speed of can also be calculated.

The measuring means 11 measures (obtains) a response signal of the face surface 44 of the golf club head 42 caused by hitting.
Then, the response characteristic is measured based on this response signal, and the change of the response characteristic with the number of hits is obtained. In this embodiment, for example, a primary resonance frequency is calculated as the response characteristic of the face surface 44 of the golf club head 42. Then, the measuring means 11 uses the microphone 12
, Sound level meter 14, A / D board 16, and processing device 18
And have. The microphone 12 and the sound level meter 14 constitute a hitting sound measuring means 13.

The microphone 12 is for detecting a hitting sound, and is a face surface 44 of the golf club head 42.
Is located near the. The golf club 40 is arranged with the hosel portion of the golf club head 42 suspended or lightly supported. The sound level meter 14 measures the impact sound detected by the microphone 12 as a response signal (sound pressure signal).
Connected to 2.

The A / D board 16 is connected to the sound level meter 14 and the counter / ball speed meter unit 26.
It has an A / D converter that samples a response signal (sound pressure signal) output from the sound level meter 14 and converts it into a digital signal. The A / D board 16 uses the input section 18a of the processing device 18 to be described later for the sampled response signal.
Output to.

The processing device 18 has a function of calculating, for example, a primary resonance frequency based on the waveform of the response signal digitized by the A / D board 16.
Input unit 18a, frequency analysis unit 18b, and determination unit 1
8c and. The determination means 18c of the processing device 18 displays A
A stop circuit 32 is connected via the / D board 16. The stop circuit 32 stops the ejection of the golf ball 46, and is connected to the ball ejection device 22. Specifically, the stop circuit 32 is composed of, for example, a limit switch, and the limit switch operates to stop the intermittent ejection of the golf ball 46 by the ball ejection device 22. As a result, the golf club head durability test apparatus 10 stops.

The input section 18a is for inputting the number of hits and the ball speed data from the counter / ball speedometer unit 26. The input section 18a and the counter / ball speedometer unit 26 are connected via an interface. It is connected. An example of this interface is RS232C. In addition, the response signal of the impact sound converted into a digital signal from the sound level meter 14 is A /
It is input through the D board 16. further,
The trigger signal from the hit count measuring means 28 is also input. The frequency analysis means 18b frequency-analyzes a waveform output signal, which is a response signal converted into a digital signal and input to the input section 18a, for each impact.
For example, FFT (Fast Fourier Transformation) processing is performed. The frequency analysis unit 18b can determine the primary resonance frequency of the face surface 44 of the golf club head 42, for example.

The judging means 18c is a frequency analyzing means 18b.
It is determined whether or not the primary resonance frequency calculated in (hereinafter, referred to as the calculated primary resonance frequency) satisfies the determination criteria described later. When the calculated primary resonance frequency satisfies the determination standard, the determining unit 18c outputs a stop signal from the determining unit 18c to the stop circuit 32 to stop the golf club head durability test apparatus 10. Examples of the determination criteria include a case where the calculated primary resonance frequency is equal to or less than the determination reference value and continuously measured one or more times. Examples of the determination reference value include a value of a desired primary resonance frequency or a value set based on the primary resonance frequency of the golf club head in an initial state (hereinafter, referred to as an initial value). The determination as to whether or not the primary resonance frequency satisfies the determination criterion in this embodiment corresponds to the determination as to whether or not the response characteristic in the present invention is within a predetermined range. In addition, the determination standard is input to the determination unit 18c from the input device 17 described later. Further, the determination means 18c may store the above-described determination reference value for each type of the golf club head 42, for example.

In this embodiment, for example, 3200 Hz
The golf club head durability test apparatus 10 is stopped when the following primary resonance frequency is continuously measured twice (determination criterion). In addition to this, from the initial value, for example, 500H
z The golf club head endurance test apparatus 10 may be stopped when the primary resonance frequency is lowered (determination criterion).

In this way, the determining means 18c can stop the golf club head durability test apparatus 10 (hereinafter also referred to as a test apparatus). The reason for this is that the inventors of the present application have found the following findings.
FIG. 2 is a graph schematically showing the change process of the primary resonance frequency with the number of hits, with the horizontal axis representing the number of hits and the vertical axis representing the primary resonance frequency. The example shown in FIG. 2 is based on a test condition in which a titanium alloy face surface of a wood type hollow golf club head has a plate thickness of 2.4 mm and a striking force equivalent to 40 m / sec in terms of head speed is applied. Is.

As shown in FIG. 2, the inventors of the present application
In the process of the change of the primary resonance frequency of the frub head
Therefore, the primary resonance frequency slightly decreases as the number of impacts increases.
Area R where frequency decreases₁And the primary resonance circumference associated with the impact
Region R where the drop in wave number is large ₂And the first order with the impact
Region R where the lowering of vibration frequency becomes larger₃And the three
We have found that the region exists. Region R₁Fatigue breakdown
The rigidity of the golf club head is gradually decreasing due to
It is considered that the state is Region R₂A golf club
Face the back surface of the head with cracks and face
It is considered that the cracks are in a state of spreading. region
R₃Cracks extend to the face of the golf club head
It is thought that the crack has reached and the crack has spread rapidly.
It From this, the region R₁And area R₂In the boundary area with
In a certain region a, the back surface of the face surface of the golf club head
It is thought that cracks have begun to appear in such places. Ie the area
a is considered to be the initiation region of the golf club head fracture
It On the other hand, in region b, the golf club head
The crack has reached the base surface and has been visually confirmed.
It The resonance frequency used in the present invention is the golf club.
Not only the primary resonance frequency of the face surface of the head but also the secondary resonance frequency,
A higher resonance frequency such as the third order may be used.

As described above, conventionally, destruction was judged by visual inspection when cracks or damages occurred on the surface of the golf club head, but cracks or damages which could not be visually confirmed before this judgment time were judged. The occurrence of can be understood. Therefore, by measuring the primary resonance frequency for each hit, the timing of occurrence of damage to the back surface of the face of the golf club head and the timing of damage to the face surface of the golf club head can be quantitatively determined by the number of hits. You can figure it out.

In the present embodiment, the golf ball is ejected to the face surface of the golf club head using an air cannon to give a hit, and the primary resonance frequency is obtained from the hit sound at this hit. However, the present invention is not limited to this, and a person or a hitting robot may hit the face surface of the golf club head with a golf ball. Further, in the present embodiment, the frequency analysis means is not particularly limited, and a frequency analysis method such as 1 / N octave analysis can be appropriately used other than the conversion by FFT.

When the calculated primary resonance frequency of the golf club head 42 is lowered by the above-mentioned impact in the determination means 18c and the primary resonance frequency thus calculated satisfies the above-mentioned determination criteria, the determination means 18c stops the operation. The signal is output to the stop circuit 32. Thereby, the ball injection device 2
2 stops and the intermittent ejection of the golf ball 46 stops. That is, the impact on the golf club head 42 is stopped.

Further, in the processing device 18, the primary resonance frequency is obtained by a known frequency analysis. That is,
A sound pressure signal of a hitting sound generated when a golf ball 46 hits the face surface 44 of the golf club head 42 is measured as a response signal, and the primary resonance frequency is obtained from the response signal.

The storage unit 15 stores a response signal (sound pressure signal) of a hitting sound, a spectrum waveform of this response signal, a value of the calculated primary resonance frequency, the number of hits, a golf ball speed, and a golf club head durability test. The test condition and the measurement condition, the test start time and the test end time, and the folder name and file name storing these data are stored, and the input unit 18a and the frequency analysis unit 18b are stored.
It is connected to the.

The display device 19 is connected to the input section 18a and the frequency analysis means 18c and displays at least the number of hits and the primary resonance frequency in a graph under the control of the processing device 18. In addition to this, the display device 19 may include, for example, a screen for inputting test conditions during a golf club head endurance test, a screen showing measurement results of primary resonance frequency, an input screen for inputting various instructions to the processing device 18, and the like. Is displayed. These will be described later.
As the display device 19, a conventionally known device such as a CRT display and a liquid crystal display can be appropriately used.

Further, the input device 17 is, as described later,
Golf club head endurance test apparatus 10 including "condition setting" button, "forced end" button, and "end" button
In addition to instructing, the measurement conditions are input and various instructions are given to the processing device 18. As the input device 17, for example, a keyboard, a mouse, a track pad or the like can be used. From this input device 17 to the determination means 1
Input the above-mentioned criteria in 8c.

Next, the golf club head durability test method of this embodiment will be described. FIG. 3 is a flowchart showing a golf club head endurance test method according to the embodiment of the present invention, and FIG. 4 is a schematic diagram showing an example of a display screen according to the golf club head endurance test program according to the embodiment of the present invention. Is. FIG. 5 is a schematic diagram showing an example of a display screen when a preliminary test is performed by the golf club head durability test apparatus of this example.

As shown in FIG. 3, as conditions setting prior to the golf club head endurance test, the trigger condition of the golf club head endurance test apparatus 10 is set and the resonance frequency of the test golf club head is investigated (step). S
1). That is, a preliminary test for setting the measurement conditions of the golf club head durability test apparatus 10 is performed on the golf club head to be tested. Hereinafter, the preliminary test for setting the measurement conditions of the golf club head durability test apparatus 10 in step S1 will be described in detail.

First, as shown in FIG. 4, the start-up screen A by the golf club head endurance test program is displayed on the display device 1.
9 (see FIG. 1). This startup screen A has a "condition setting" button 50 and a "file name determination / measurement" button 5
2. "End" button 54, "AD free run" button 55, "AD level trigger" button 56, "AD general-purpose digital output" button 57, "AD EXT trigger"
A button 58 and a “RS232C communication” button 59 are provided. In this embodiment, when the “condition setting” button 50 is clicked, a measurement condition setting screen described later is displayed. Also, "File name determination / measurement" button 5
When 2 is clicked, a head durability test measurement menu screen described later is displayed. In addition, "End" button 54
Click on to exit the program.

Further, in this embodiment, when the "AD free run" button 55 is clicked, the A / D board 1
It can be confirmed whether 6 (see FIG. 1) samples the signal regardless of the trigger signal. Further, in this embodiment, "A
By clicking the “D level trigger” button 56, it can be confirmed that the A / D board 16 (see FIG. 1) starts sampling by the level trigger. Further, in this embodiment, when the "AD general-purpose digital output" button 57 is clicked, the golf club head durability test apparatus 10 (see FIG.
A), a control unit (not shown) provided in the golf club head endurance test device 10
It can be confirmed that control can be performed by the digital output of the D board 16 (see FIG. 1). Furthermore, in this embodiment,
By clicking the “RS232C communication” button 59, whether the number of hits and the ball speed data from the counter / ball speedometer unit 26 (see FIG. 1) can be taken into the input unit 18a (see FIG. 1) via the RS232C (interface). I can confirm.

First, the "AD free run" button 55,
The "AD level trigger" button 56, the "AD general-purpose digital output" button 57, and the "RS232C communication" button 59 are clicked to confirm the operation of the golf club head durability test apparatus 10. Next, after checking the operation,
When the "AD EXT trigger" button 58 on the startup screen A is clicked, an AD check external (EXT) trigger screen B is displayed as shown in FIG. In this case, when the golf ball 46 passes in front of the photocell 30 (see FIG. 1), the A / D board 16 is generated by an external trigger generated.
It can be seen that (see FIG. 1) starts sampling. This AD check external (EXT) trigger screen B displays the "number of channels (maximum 8C
"H)" input field 60a, "Sampling frequency (H
z) ”input field 60b,“ total data count ”input field 60
An input field 60d for "c" and "trigger delay" is provided. Further, an input field 61a for "peak frequency lower limit value (Hz)" and an input field 61b for "peak frequency upper limit value (Hz)" are provided.

In the "Number of channels (maximum 8 channels)" input field 60a, 1 is set as the number of response signals to be sampled.
Enter an integer from 8 to 8. "Sampling frequency (H
z) ”is set to 20000 or more, and a numeric value of 20000 or more is input in the input field 60b. For “total number of data”, it is necessary to input a value of 2 ⁿ (n is a natural number) in order to perform FFT analysis.
Enter a value of 2 ⁿ . "Trigger delay" input field 6
In 0d, enter a negative number in the case of pre-trigger and a positive number in the case of post-trigger. In addition, in the state where the AD check external (EXT) trigger screen B is displayed,
As will be described later, there is a time delay from the output of the trigger signal generated when the golf ball 46 crosses the phototube 30 (see FIG. 1) to the hitting of the face surface 44, and therefore the post trigger setting is performed.

The lower limit value and the upper limit value of the search range of the peak frequency are entered in the "peak frequency lower limit value (Hz)" input field 61a and the "peak frequency upper limit value (Hz)" input field 61b, respectively.

The AD check external (EXT) trigger screen B is provided with an explanation column 62 for explaining the trigger. In this explanation field 62, for example, "1. trigger is an external trigger. (41 GRD42) 2.41 and 4"
Between 2 is usually + 5V. 3. When short-circuited, the falling edge is effective and sampling starts. 4. Set the pre-trigger with a negative value (eg -200) ". Further, the AD check external (EXT) trigger screen B is provided with a "falling" check field 63a and a "rising" check field 63b for selecting "external trigger polarity" described later. Also,
"Condition setting / data import" button 64, "file creation" button 65, "redraw" button 66 and "return"
A button 67 is provided. Furthermore, as will be described later, a peak frequency display field 6 for displaying the peak frequency in the spectrum waveform displayed in the measurement result display field 74.
8 are provided. Further, a trigger status display field 70 for displaying the trigger status of the A / D board 16 (see FIG. 1) is provided. AD check shown in Fig. 5 External (EX
T) On the trigger screen B, "Sampling completed" is displayed.

The "trigger delay" and the "external trigger polarity" will be described. FIG. 6A is a graph schematically showing an example of the relationship between the timing of generation of a trigger signal and the timing of generation of a batting sound, with the horizontal axis representing time and the vertical axis representing the response signal of the batting sound. , (B) are graphs schematically showing an example of changes in the phototube output voltage when the golf ball passes in front of the phototube, with the horizontal axis representing time and the vertical axis representing photocell output voltage.

Point A in FIG. 6A shows the point where the golf ball passes through the photoelectric tube, point B shows the hitting point, and point C
The point indicates the point at which sampling should be started. Figure 6 (a)
As shown in, the response signal of the impact sound is not output up to the impact point (point B) when the golf ball passes in front of the phototube (from point A). In this way, since there is a time delay (trigger delay) from the trigger output from the photoelectric tube to the striking, the post trigger setting is used in this embodiment. In this embodiment, for example, the time difference between points A and C is set as a post trigger.

Further, as shown in FIG. 6 (b), the output voltage from the phototube is, for example, usually 5 V, and the output is 0 only for several milliseconds when the golf ball passes in front of the phototube.
It becomes V. At this time, if the output voltage falls to 0V,
Alternatively, a trigger can be taken depending on whether the output voltage rises to 5V. Such a change in rising or falling of the output voltage is referred to as “external trigger polarity”.

On the AD check trigger screen B, A
/ D board 16 (see FIG. 1), the waveform display column 72 in which the time waveform of the response signal (input voltage) is displayed, and the time waveform displayed in the waveform display column 72, for example, in the frequency analysis method, A measurement result display field 74 for displaying a spectrum waveform calculated using FFT analysis is provided. By designating the items displayed on the AD check trigger screen B, it is possible to check the setting of the trigger level and the range of the resonance frequency on the face surface of the golf club head to be tested in advance.

First, for example, "the number of channels (maximum 8C
"1)" in the input field 60a for "H)", "50000" in the input field 60b for "sampling frequency (Hz)", and "4096" in the input field 60c for "total number of data".
(= 2 ¹² ) ”and enter the“ Trigger delay ”input field 6
Enter "500" (post-trigger) in 0d, and enter "3000" in the input field 61a for "peak frequency lower limit (Hz)".
Enter, and enter the "peak frequency upper limit (Hz)" in the input field 6
Enter "5000" in 1b. Then, for the "external trigger polarity", check the "falling" check box 63a.

Next, "condition setting / data import" button 6
When 4 is clicked, the trigger state becomes "wait for trigger" (not shown). When the golf ball 46 is ejected from the ball ejecting device 22 in this state, a detection signal is output from the photoelectric tube 30, and a trigger signal is output from the hit count measuring means 28 from the counter / ball speedometer unit 26 to the A / D board 16. Is entered. Then, when the golf ball 46 hits the face surface 44 of the golf club head 42 to generate hitting sound, a response signal of the hitting sound is sampled at the above-described sampling frequency and the total number of data. The counter / ball speedometer unit 26 outputs the number of hits and the ball speed data to the input section 18a via RS232C (not shown).

As a result, as shown in FIG. 5, in the AD check external (EXT) trigger screen B, the response signal of the impact sound is displayed in the waveform display field 72. The response signal of the hitting sound is sampled by the A / D board 16, converted into a digital signal, and input to the input unit 18a. next,
A response signal (digital signal) is output from the input unit 18a, frequency analysis is performed by the frequency analysis unit 18b, and a spectrum waveform as a result of this frequency analysis is displayed in the measurement result display field 74.
Is displayed in. At this time, the trigger state is displayed in the trigger state display field 70 as "sampling completed". next,
The peak frequency p in the spectrum waveform is detected, and the value of the peak frequency p detected from this spectrum waveform is displayed in the peak frequency display field 68, for example, "4391.6". Based on the value of the peak frequency p, the frequency search range is set on the measurement condition setting screen described later.
In this way, a preliminary test can be performed.

By clicking the "Create file" button 65, the time waveform and frequency analysis result data can be saved in a predetermined folder. Then, after the preliminary test is completed, the user clicks the "Return" button 67 to return to the start-up screen A shown in FIG. Further, by clicking the “redraw” button 66, the upper limit value and the lower limit value of the peak frequency can be set again in order to reset the peak frequency search range in the preliminary test.

Next, a golf club head durability test will be described. 7 to 9 are schematic diagrams showing, for each procedure, examples of display screens according to the golf club head endurance test program according to the embodiment of the present invention. First, by clicking the “condition setting” button 50, the measurement condition setting screen C shown in FIG. 7 is displayed. The measurement condition setting screen C is for setting measurement conditions and stop conditions for the golf club head durability test.

In the measurement condition setting screen C, "measurement condition", "analysis condition", "endurance tester stop condition",
AD check A fixed "fixed condition" is displayed on the external (EXT) trigger screen B. For the measurement conditions, the “Sampling frequency (Hz)” input field 76
a, an input field 76b for "total number of data", an input field 76c for "delay", and an input field 76d for "trigger edge". The input field 76a is the input field 6 shown in FIG.
It corresponds to 0b. The input field 76b corresponds to the input field 60c shown in FIG. Input field 76c
Corresponds to the input field 60d shown in FIG. Further, the input field 76d is a check field 63a, 6 shown in FIG.
It corresponds to 3b. Therefore, the input fields 76a to 76d shown in FIG.
A predetermined numerical value is input. Since the input fields 76a to 76d shown in FIG. 7 are similar to the input fields 60b to 60d and the check fields 63a and 63b shown in FIG. 5, detailed description thereof will be omitted.

For example, "50000" is entered in the "Sampling frequency (Hz)" input field 76a.
For example, “819
2 ”has been entered. For example, "500" is input in the "delay" input field 76c. In the "trigger edge" input field 76d, for example, "1: falling edge" is selected.

The analysis condition is provided with an input field 78a for "frequency search range lower limit (Hz)" and an input field 78b for "frequency search range upper limit (Hz)". For example, "2800" is input in the input field 78a, and "4000" is input in the input field 78b. In the present embodiment, the frequency search range is set so that the peak level of the resonance frequency of the face surface 44 of the golf club head 42 becomes maximum within the range of the frequency search range lower limit value (Hz) to the frequency search range upper limit value (Hz). Set the lower and upper limits of.

The end condition of the endurance tester is provided with an input column 79a for "stop determination frequency (Hz)" and an input column 79b for "number of continuous stop determinations". The value of the peak frequency at which the golf club head endurance test apparatus 10 is stopped is input in the "stop determination frequency (Hz)" input field 79a. For example, "3100" is entered in the entry field 79a. In the input field 79b for the "number of continuous stop determinations", the number of times the value of the peak frequency input to the input field 79a is continuously measured, the number of times the golf club head endurance test device 10 is stopped is determined. Enter. In this input field 79b, an integer of 1 to 10 is input, for example, "2" is input. In this embodiment, when the numerical conditions entered in the input fields 79a and 79b are satisfied, that is, when the peak frequency of 3100 Hz is measured twice in succession, the golf club head durability test apparatus 10 is stopped. And end the durability test. The fixed conditions are "the number of channels used" and "use of external trigger". These items are set by the preliminary test described above.

Further, on the measurement condition setting screen C, a "reset" button 75, a "change and return" button 80,
A “return without changing” button 82 is provided. Each input field 76a shown in the measurement condition setting screen C shown in FIG.
Through 76d, 78a, 78b, 79a and 79b are set as the measurement conditions. in this case,
When the “change and return” button 80 is clicked, the input fields 76a to 76d, 78 shown in the measurement condition setting screen C are displayed.
The values input to a, 78b, 79a, and 79b are registered and saved, and become the default values when the measurement condition setting screen C is started next time.

On the other hand, when the "Return without changing" button 82 is clicked, each of the input fields 76a to 76d shown in FIG.
The input values of 78a, 78b, 79a, and 79b are not registered or stored, and the test is performed under the setting conditions set on the measurement condition setting screen C.

When the "reset" button 75 is clicked, each input field 76a on the measurement condition setting screen C is displayed.
To 76d, the input fields 78a and 78b, and the numerical values in the input fields 79a and 79b are returned to the standard settings. By clicking this "Reset" button 75,
When the user is confused about the setting conditions, the standard setting can be set in advance. In the present embodiment, the sound level meter 14 is, for example, LA- manufactured by Ono Sokki Co., Ltd.
210 is used. For the setting of the noise level meter 14, for example, filter processing of the A characteristic (130 dB range) is performed.

On the measurement condition setting screen C shown in FIG. 7,
After setting the measurement conditions, click the “Return and return” button 80 or the “Return without change” button 82 to display the screen shown in FIG.
The screen returns to the start screen A shown in. And, "File name decision ・
Click the “Measure” button 52.

Next, as shown in FIG. 8, a head durability test measurement menu screen D is displayed. The head endurance test measurement menu screen D is provided with a display area 86 for displaying the “AD board state”. In this display area 86,
Various states of the AD board such as “stop” or “sampling completed” are displayed. Further, on the head durability test measurement menu screen D, an input field 84a for "folder name",
"File name" input field 84b and "Measurement count set value"
Input field 84c is provided. In the "folder name" input field 84a, for example, "D: \ golf durability tester V
The folder name "er1.13 \ Data" is input. In the "File name" input field 84b, for example, "dp
The file name "pd10-4" is input. The number of times to be measured is set in the “measurement number set value” input field 84c, and for example, “2000” is input. In this way, the measurement conditions are written in the designated folder with the designated file name (step S2).

Also, the head endurance test measurement menu screen D
Is provided with a “reference” button 88. By clicking the “reference” button 88, a folder name can be input. In this case, since there is no function to create a new folder, the already created folder is specified.

Further, the head endurance test measurement menu screen D is provided with a display field 89a indicating whether the endurance test apparatus is operable or stopped. This display field 89a is displayed as "operating" when the durability test apparatus is operating, and is displayed as "stop" when the durability test apparatus is stopped. Further, there is provided a display field 89b showing how many times the "stop determination continuous number" shown in FIG. 7 has been measured. In this display field 89b,
The number of times the "stop determination continuous number" is measured is displayed in a / b. “A” indicates the number of times of measurement, and “b” indicates the value input in the display field 79b. Further, the head endurance test measurement menu screen D is provided with display fields 90a and 90b for displaying, as read values, the number of measurements taken from the counter / ball speedometer unit 26 and the head speed, respectively. The head speed in the display field 90b in this embodiment is a value obtained by converting the speed of the golf ball. Further, as a read value, a display column 9 in which the peak frequency at the number of times of measurement displayed in the display column 90a is displayed.
0c is provided.

Further, the head endurance test measurement menu screen D
"Measurement start" button 92, "Forced end" button 9
3, a “measurement restart” button 94, a “return” button 95, and a “graph redraw” button 96 are provided. Further, the head durability test measurement menu screen D is provided with a display area 100 for displaying the measurement result of the golf club head durability test described later. "Start measurement" button 9
When 2 is clicked, the durability test is started as described later. Further, when the “forced end” button 93 is clicked, the measurement is interrupted after the trigger is applied. When the "restart measurement" button 94 is clicked, the interruption of the measurement is restarted based on the above-mentioned endurance tester stop condition. When the "Return" button 95 is clicked, the screen returns to the startup screen A shown in FIG. When the "graph redraw" button 96 is clicked, the data file of the graph displayed in the display area 100 is read again and redisplayed.

Next, the input fields 84a to 84c shown in FIG.
After inputting each item in, setting the folder name and the number of times of measurement, click the "start measurement" button 92. Check if the same file exists, and if the same file exists,
A message (not shown) that the same file exists is displayed, and the screen returns to the head endurance test measurement menu screen D shown in FIG. On the other hand, if the same file does not exist, the measurement conditions are written with the file name set on the head durability test measurement menu screen D and set in the folder (step S2), and the golf club head durability test is started. At this time, the values input in the input fields 84a to 84c shown in FIG. 8 are registered and stored, and become the default values when the head durability test measurement menu screen D is started next time. At this time, the display of the display area 86 in the AD board state becomes "trigger wait" (not shown). From the ball injection device 22 to the golf ball 4
When 6 is emitted and a trigger signal based on the output signal of the photoelectric tube 30 is output, the measurement is started.

Next, in the test starting state, the processing apparatus 1
It is determined whether the trigger signal is input to the input unit 18a of 8 (step S3). In this case, when there is no input of the trigger signal, the state of waiting for the input of the trigger signal is entered. on the other hand,
When a trigger signal is input, 2 ⁿ (8192) pieces of measurement data are taken in (sampled) at a predetermined sampling frequency (50000 Hz) for the impact sound based on the measurement conditions shown in FIG. 7 (step S4). The measurement data of the impact sound is displayed in the display area 72 as shown in FIG.
Is displayed as a time waveform.

Next, the measurement data of the impact sound is subjected to frequency analysis using, for example, FFT analysis (step S
5).

Next, for example, 2500 to 500 set in the analysis conditions of the measurement condition setting screen C shown in FIG.
A peak frequency that maximizes the peak level is searched in the frequency search range of 0 Hz (2.5 to 5 kHz), and that frequency is set as the primary resonance frequency (step S6).

Next, the counter / ball speedometer unit 2
6, the number of hits after the start of the golf club head endurance test and the ball velocity data are processed by the processing device 18 (input unit 1
8a) is read (step S7). Further, the primary resonance frequency at each number of hits is displayed in the display area 100 (step S8). FIG. 9 shows an example of the display screen. Note that FIG. 9 also shows the test results. Input field 8
4a includes a folder name "D: \ golf durability tester Ver.
"1.13 \ Data" is displayed, and in the input field 84b,
The file name "dppd10-4" is displayed, and the input field 8
A measurement count setting value "2000" is displayed on 4c. Further, for example, "1278" is displayed as the "measurement count" in the display field 90a, and "50.4" is displayed as the "head speed" in the display field 90b.
In the display column 90c, for example, "307" is displayed as "frequency".
6.2 "(Hz) is displayed.

In the display area 100, the measurement results are displayed with the frequency on the vertical axis and the number of hits on the horizontal axis. In this display area 100, a line is drawn at the position of the stop determination frequency (3100 Hz),
The measured values below the stop determination frequency are displayed in red, for example. Next, the number of hits, the ball speed, and the primary resonance frequency are recorded in the file shown in the input field 84b (step S
9).

Next, it is determined whether the calculated primary resonance frequency satisfies the criterion (endurance tester stop condition) (step S10). The judgment criterion in step S10 is shown in FIG.
As shown in, when the value of the calculated primary resonance frequency is continuously measured twice, for example, at 3100 Hz or less, the test apparatus 10 automatically stops. In this case, the following three methods are performed in order for the user to judge and automatically release the stopped state. (1) Change the fill name. (2) Click the "Restart measurement" button 94.
(3) After clicking the "Return" button 67, the head durability test measurement menu screen D is displayed again.

In this embodiment, the criterion is
The golf club head 40 is not particularly limited.
It can be appropriately set depending on the type of the. For example, during the preliminary test, the primary resonance frequency is measured, and this primary resonance frequency is used as the initial value. For this initial value, for example, 3
A value lower than 00 Hz may be used as the determination reference value. in this case,
The test apparatus 10 is stopped when the calculated primary resonance frequency is lower than the initial value by 300 Hz. These judgment criteria are set by inputting from the input device 17 as described above. Further, this judgment criterion may be set by inputting it from the input device 17 to the judging means 18c based on the result of the preliminary test. Further, as described above, the determination standard is the determination means 18c for each type of golf club head in advance.
You may store it in. An allowable range may be set for the criterion value in this criterion.

Next, in step S10, if the determination criteria are satisfied, the determination means 18c outputs a stop signal to the stop circuit 32, and further, the stop circuit 32 outputs a stop signal to the ball ejecting device 22 so that the golf ball 46 The injection is stopped and the test apparatus 10 is stopped. Then, the test end time is recorded in the data file, and the test ends (step S13).

On the other hand, if the criterion is not satisfied in step S10, it is confirmed whether the "forced termination" button 93 has been clicked (step S11). Next, when the "forced end" button 93 is clicked in step S11, the test end time is recorded in the data file and the test ends, as shown in step S13.

The test result shown in the display area 100 of FIG.
The number of hits is 1 while the set number is 2000
This is the result when the test was automatically interrupted because the primary resonance frequency of 3100 Hz or less was continuously measured twice at 278 times. Areas a ₁ and b ₁ shown in FIG. 9 corresponding to the areas a and b shown in FIG. 2 have a fracture start point and a complete fracture point, respectively. in this way,
In this embodiment, the number of hits at the break starting point and the number of hits at the complete break point can be automatically measured.

On the other hand, when the "forced end" button 93 is not clicked in step S11, the number of hits is compared with the set number of times (measurement number set value in the input box 84c) (step S12). When the number of hits is less than the set number of times in step S12, the above-described step S3
Through step S11 are repeated. On the other hand, step S12
If the number of hits is equal to the set number, the test end time is recorded in the data file and the test ends, as shown in step S13.

FIG. 10 is a schematic diagram showing an example of the test results of the golf club head durability test program according to the embodiment of the present invention. As shown in FIG. 10, the test results are the data sheet 102 including test data 104, measurement conditions (see FIG. 7), analysis conditions (see FIG. 7), endurance tester stop conditions (see FIG. 7), and measurement start time. The measurement end time is recorded in the storage unit 15 (see FIG. 1) for each file name. Examples of the test data 104 include the number of times of programming, the number of times of reading, the head speed, the frequency, and the spectrum. The program count is a measured value of the number of hits measured by the hit count measuring means 28 (see FIG. 1) after the start of measurement by the program, and is accumulated in the counter / ball speedometer unit 26 (see FIG. 1). The number of readings is the number of hits accumulated in the counter / ball speedometer unit 26, and includes the number of hits in the above-mentioned preliminary test. Head speed is golf ball 46 (see FIG. 1)
The golf ball speed calculated from the difference in the transit time of the photocell 30 (see FIG. 1) of the counter / ball speed meter unit 26
It is the value converted by. The frequency and spectrum were measured at each impact by the method described above.

FIG. 11 is a graph showing an example of the test results by the golf club head endurance test apparatus of this embodiment, with the horizontal axis representing the number of hits and the vertical axis representing the primary resonance frequency. In the example shown in FIG. 11, the titanium alloy face has a plate thickness of 2.2 mm and a head speed of 40 m /
This is due to the test conditions in which a striking force equivalent to seconds is applied. As shown in FIG. 11, it is possible to obtain a test result in which the primary resonance frequency decreases with the number of hits. Also in this case, the area a ₂ and the area b ₂ shown in FIG. 11 corresponding to the area a and the area b shown in FIG. And the number of hits at the complete breaking point can be automatically measured.

In this embodiment, the impact of the golf ball on the golf club head is a fatigue fracture and the impact of measuring the primary resonance frequency, which is one of the response characteristics of the golf club head. It produces sound. Furthermore, by taking into consideration the judgment criteria based on the knowledge of the inventor of the present application, as shown in FIGS. 9 and 11, the fracture starting point where a crack is generated on the back surface of the face and the face surface without visual inspection. It is possible to grasp the complete break point where cracks occur.
For this reason, even if the test is performed at night and the golf club head is destroyed before the set number of times, the test device is stopped based on the determination standard, so that the face surface of the golf club head is prevented from completely separating. It Thereby, the position of the face surface of the golf club head at which the breakage starts can be confirmed.

Further, since the test device can be stopped before the face surface of the golf club head is completely destroyed, the test time can be shortened. The ball ejection device 22 has, for example, a golf ball ejection capacity of 15 shots / minute. Therefore, if the number of hits can be reduced by 1000, the test time can be shortened by 1 hour.
Further, in the test apparatus, when the face surface of the golf club head is completely detached, when the golf ball collides, the golf ball is damaged and cannot be used for the test.
However, since damage to the face surface of the golf club head is suppressed, damage to the golf ball can be prevented and the running cost of the test apparatus can be reduced.

Further, in this embodiment, the response signal of the golf club head is used as a characteristic value, and 1 of the face surface of the golf club head measured from the impact sound of the golf ball is measured.
Although the second resonance frequency is used, the present invention is not limited to this, and may be a second or third higher resonance frequency, for example. Further, in the present embodiment, the resonance frequency may be calculated by measuring the vibration of the face surface of the golf club head with a laser Doppler or an accelerometer in addition to the impact sound. Furthermore, the face surface of the golf club head may be observed with a camera or the like for each hit, and whether or not a crack has occurred on the face surface of the golf club head may be observed.

Further, in this embodiment, the judging means 18
Although c is provided, for example, if the endurance test apparatus 10 is stopped when the set number of times is automatically set based on the initial value and the set number of hits is completed, the determination means 1 is not always necessary.
It is not necessary to provide 8c. Further, by providing the test device with a hit count measuring means and using an external trigger as a trigger, a measurement error of the hit count can be eliminated, and a stable test can be performed.

Further, in the present invention, the golf club head endurance test method of the present embodiment described above is executed by a golf club head endurance test program using a computer (not shown) connected to the processing device 18, for example. You can According to the golf club head endurance test program of the present invention, the ball ejection device 22, the measuring device 11, the storage device 15, the display device 19, and the number of hits that give hits intermittently in order to fatigue and destroy the face surface 44 of the golf club head 42. The durability test of the golf club head 42 described above can be performed by controlling the components of the golf club head durability test apparatus 10 such as the measuring means 28. The golf club head endurance test program is for executing the above-mentioned endurance test by controlling each component using a computer, for example, and the procedure is the same as the above-mentioned endurance test method. Therefore, detailed description thereof will be omitted.

[0081]

As described above in detail, according to the present invention, the face surface of the golf club head is intermittently hit with, for example, a golf ball, and the golf club head is hit with each hit. By measuring the response characteristic of the face surface of the golf club and measuring the change in the response characteristic with respect to the number of hits, the number of hits at the start of breaking the golf club head is automatically performed without stopping the visual inspection and the test apparatus, and It is possible to count the number of blows that have been completely destroyed.

[Brief description of drawings]

FIG. 1 is a schematic view showing a golf club head durability test apparatus according to an embodiment of the present invention.

FIG. 2 is a graph schematically showing the change process of the primary resonance frequency with the number of hits, with the horizontal axis representing the number of hits and the vertical axis representing the primary resonance frequency.

FIG. 3 is a flowchart showing a golf club head durability test method according to an example of the present invention.

FIG. 4 is a schematic diagram showing an example of a display screen according to the golf club head durability test program according to the embodiment of the present invention.

FIG. 5 is a schematic diagram showing an example of a display screen when a preliminary test is performed by the golf club head durability test apparatus of the present embodiment.

FIG. 6A is a graph schematically showing an example of a relationship between a trigger signal generation time and a batting sound generation time, in which the horizontal axis represents time and the vertical axis represents a batting sound response signal. And
(B) is a graph schematically showing an example of changes in the phototube output voltage when the golf ball passes in front of the phototube, with the horizontal axis representing time and the vertical axis representing the phototube output voltage.

FIG. 7 is a schematic view showing an example of a display screen on the screen following the procedure shown in FIG.

FIG. 8 is a schematic diagram showing an example of a display screen of a procedure following the procedure of FIG.

9 is a schematic diagram showing an example of a display screen in the procedure following that of FIG. 8. FIG.

FIG. 10 is a schematic diagram showing an example of test results of a golf club head durability test program according to an example of the present invention.

FIG. 11 is a graph showing an example of test results by the golf club head durability test apparatus of the present example, where the horizontal axis represents the number of hits and the vertical axis represents the primary resonance frequency.

FIG. 12 is a schematic view showing a device for hitting the face surface of a conventional golf club head.

[Explanation of symbols]

10 Golf Club Head Durability Test Device 11 Measuring Means 12 Microphone 13 Battering Sound Measuring Means 14 Sound Level Meter 15 Storage Unit 16 A / D Board 17 Input Device 18 Processing Device 18a Input Unit 18b Frequency Analysis Means 18c Judgment Device 19 Display Device 20 Air Cannon 22 Ball Ejecting Device 24 Ball Ejecting Guide 26 Counter / Ball Speed Meter Unit 28 Hit Count Measuring Means 30 Photoelectric Tube 32 Stop Circuit 40 Golf Club 42 Golf Club Head 44 Face 46 Golf Ball 50 “Condition Setting” Button 52 “File Name Determination / "Measurement" button 54 "End" button 55 "AD free run" button 56 "AD level trigger" button 58 "AD EXT trigger" button 60a, 60b, 60c, 60d, 61a, 61b Input column 62 Explanation column 64 "Condition setting / Day Data import ”button 65“ Create file ”button 67“ Return ”button 70 Trigger status display field 72 Waveform display field 74 Measurement result display field 76a, 76b, 76c, 76d Input field 78a, 78b Input field 84a, 84b, 84c Input Columns 90a, 90b, 90c Display column 92 "Measurement start" button 94 "Measurement restart" button 95 "Return" button 96 "Graph redraw" button 100 Display area A Startup screen B AD check trigger screen C Measurement condition setting screen D Head Endurance test measurement menu screen

Claims (12)

[Claims] 1. A striking means for intermittently striking a face surface of a golf club head to cause fatigue destruction, and a response characteristic of the face surface of the golf club head due to the striking is measured for each striking, A golf club head durability test apparatus, comprising: a measuring unit that obtains a change in the response characteristic with respect to the number of hits. 2. A hitting means for determining whether or not the response characteristic of the face surface of the golf club head is within a predetermined range, and the hitting means when the response characteristic of the face surface is out of the predetermined range. The golf club head durability test apparatus according to claim 1, wherein the hitting by the golf ball is stopped. 3. The golf club head durability test apparatus according to claim 1, wherein the response characteristic of the face surface of the golf club head is a resonance frequency of the face surface. 4. The hitting sound measuring means for measuring the hitting sound of the face surface, and the frequency analyzing means for calculating the resonance frequency from the hitting sound measured by the hitting sound measuring means. The golf club head durability test apparatus according to claim 3, wherein the hitting on the face surface by the hitting means is a hitting with a golf ball. 5. The golf club head durability test apparatus according to claim 4, wherein the hitting means is a trial hitting robot or a ball ejecting means for ejecting a golf ball. 6. The golf club head endurance test device according to claim 3, further comprising a display device for displaying at least the resonance frequency of the face surface together with the number of hits for each hit. . 7. A step of intermittently giving a hit in order to fatigue damage the face surface of the golf club head, and a step of measuring a response characteristic of the face surface of the golf club head by the hit at each hit. And a step of obtaining a change in the response characteristic with respect to the number of hits, a golf club head endurance test method. 8. A step of determining whether or not the response characteristic of the face surface is within a predetermined range, as a step subsequent to the step of obtaining the change of the response characteristic of the face surface of the golf club head. The golf club head durability test method according to claim 7, wherein the hitting is stopped when the response characteristic of the face surface of the golf club head is out of a predetermined range. 9. The golf club head durability test method according to claim 7, wherein the response characteristic of the face surface of the golf club head is a resonance frequency of the face surface. 10. The step of measuring the response characteristic of the face surface of the golf club head includes the steps of measuring a hitting sound of the face surface by the hitting, and calculating the resonance frequency from the hitting sound. The golf club head durability test method according to claim 9, further comprising: 11. A computer-executable program for causing a computer to execute an endurance test on the golf club head by controlling a striking means for intermittently striking the face surface of the golf club head to cause fatigue damage. A procedure for causing a computer to generate a control signal for giving a hit to the face surface of the golf club head and supplying the control signal to the hitting means, and the golf club head with the hit for each hit. 2. A golf club head endurance test program, comprising: a step of causing the computer to measure the response characteristic of the face surface; and a step of causing the computer to obtain a change in the response characteristic with respect to the number of hits. 12. As a post-procedure for causing the computer to obtain a change in the response characteristic with respect to the number of hits, the computer determines whether the response characteristic of the face surface of the golf club head is within a predetermined range. If the response characteristic of the face surface of the golf club head is out of a predetermined range,
The golf club head durability test program according to claim 11, wherein the hitting by the hitting means is stopped.