TWI557231B - A method for manufacturing a golf club head - Google Patents

Description

Golf club head manufacturing method

The present invention relates to a golf club head manufacturing method, and more particularly to a golf club head manufacturing method for manufacturing a golf club head having improved strength and hardness.

The conventional golf club head manufacturing method is characterized in that a bar is formed into a club head by forging, and the club head has a ball striking panel portion for striking a golf ball; however, the golf club head manufacturing method according to the foregoing The surface strength and surface hardness of the manufactured golf club head are still insufficient (especially the hitting panel portion), so that the club head is prone to deformation and the like after multiple hitting, and affects the golf ball. The performance of the head shot.

Another conventional method for manufacturing a golf club head is to first form a ball head body and a ball striking panel member, and continue to weld the ball head body and the ball striking panel member to obtain a conventional two-piece club. The head, so that the hitting panel member having a high surface strength and surface hardness can be used as the hitting panel, and the conventional two-piece club head can be prevented from being deformed due to multiple hitting; however, An additional welding process not only enhances the manufacturing complexity of the conventional two-piece club head, but also increases the manufacturing cost of the conventional two-piece club head. In view of this, the conventional golf club head manufacturing method still needs to be improved.

The present invention provides a golf club head manufacturing method which is capable of producing a golf club head having enhanced surface hardness and surface strength.

The present invention further provides a golf club head manufacturing method, which is manufactured by maintaining The golf club head obtained has sufficient surface strength and surface hardness to reduce the manufacturing complexity and manufacturing cost of the manufacturing method.

The golf club head manufacturing method of the present invention comprises: forging a spring steel bar into a ball head body, wherein the ball head body has a pair of hitting panel portions and a back, the spring steel bar includes In terms of weight percent, 0.8 to 1.1% chromium, 0.65 to 0.95% manganese, 0.47 to 0.55% carbon, 0.15 to 0.35% bismuth, 0.15 to 0.25% vanadium, 0.03% or less sulfur, 0.03% or less Phosphorus, 0.05% or less oxygen, 0.05% or less nitrogen, and a balance amount of iron; and spraying the ball head body at a quenching temperature of 800 to 1000 ° C, using a nozzle to spray a quenching medium toward the ball head body, Performing a quenching treatment, the quenching medium is a fluid having a temperature of 5 to 40 ° C, and the spray amount per minute of the nozzle is 5 to 20 L/min, so that the surface hardness of the ball head body reaches HV 267-700, tensile strength Up to 240~310ksi, the drop strength is 200~240ksi.

Wherein, the quenching treatment is performed on the entire ball head body.

The quenching process is performed on the ball striking panel portion of the ball head body.

Wherein, the quenching treatment is performed on the back of the ball head body.

After the forging of the ball head body, a plurality of wire grooves are formed on the ball striking panel portion of the ball head body, and the ball head body is continuously subjected to the quenching treatment at the quenching temperature.

Wherein, the ball striking panel portion of the ball head body is pressed to form the plurality of wire grooves.

After the ball head body is subjected to the quenching treatment, a plurality of line grooves are formed on the ball striking panel portion of the ball head body.

Wherein, the ball striking panel portion of the ball head body is milled to form the plurality of wire grooves.

In the golf club head manufacturing method of the present invention, the crystal body of the ball head body is changed by quenching the ball body, thereby improving the surface hardness and surface strength of the obtained golf club head. The efficacy of the invention.

The golf club head obtained by the golf club head manufacturing method of the present invention can replace the conventional two-piece club due to the enhanced surface hardness and surface strength. At the same time, the golf club head manufacturing method of the present invention reduces the number of welding processes compared to the conventional golf club head manufacturing method for manufacturing the conventional two-piece club head, thereby not only reducing the manufacturing complexity. Efficacy can also achieve the effect of reducing manufacturing costs.

Figure 1: The hardness distribution along the depth of the golf club head.

The above and other objects, features, and advantages of the present invention will become more apparent from the aspects of the invention. The system comprises: a forging step and a quenching step, thereby obtaining a golf club head for the user to hit a golf ball.

In detail, the forging step is forging a spring steel bar to obtain a ball head body having a slightly golf club head shape, that is, the ball head system can Having a pair of a face panel and a back, the ball head body is the golf club head after a subsequent quenching process step, and the striking panel portion is the golf club head when striking The golf ball body further includes a handle portion, the handle portion connecting the striking panel portion and the back portion for connecting to the user for holding when struck One axis, which is known to those of ordinary skill in the art to which the present invention pertains, will not be described herein.

For example, the spring steel bar can be selected as the SUP series spring steel material as shown in Table 1, and the rough forging, medium forging and fine forging are sequentially performed at a high temperature of 800 to 1000 ° C to obtain The ball head body, by the temperature of the forging step being higher than 800 ° C, allows the worker to reduce the forging pressure in the forging step, and the temperature of the forging step should not be higher than 1000 ° C, which may cause the spring steel bar The problem of decarburization may occur in the forging step; in this embodiment The SUP10 spring steel material (including 0.8 to 1.1% chromium, 0.65 to 0.95% manganese, 0.47 to 0.55% carbon, 0.15 to 0.35% bismuth, as shown in Table 1). 0.15~0.25% vanadium, 0.03% or less sulfur, 0.03% or less phosphorus, 0.05% or less oxygen, 0.05% or less nitrogen and balance iron) forging at a high temperature of 800 °C, the SUP10 spring steel material Containing chromium and vanadium, a golf club head having a high surface hardness and surface strength can be obtained after the quenching step.

The quenching treatment step is a rapid cooling heat treatment of the ball head body to change the crystal phase of the ball head body (ie, the structure forming the granulated iron phase), thereby improving the surface hardness of the obtained golf club head and The surface strength; wherein the quenching treatment step is to maintain the temperature of the ball head body at a quenching temperature, and continuously or partially quench the ball body with a quenching medium, for example, for the entire ball body (preferably, the handle portion of the ball head body is excluded), the ball striking panel portion of the ball head body, or the ball body of the ball head body The panel portion and the back portion are subjected to a quenching treatment, whereby the surface hardness and surface strength of the golf club head can be improved.

For example, the quenching temperature may be selected from the same 800~1000 ° C as the forging step, that is, the quenching medium may be directly subjected to the quenching treatment after the forging step; or alternatively, the quenching medium may be selected again. After heating the ball head body so that the ball head body reaches a quenching temperature of 800 to 1000 ° C, the ball head body is quenched by the quenching medium.

Further, the quenching medium may be selected to have a relatively low temperature fluid compared to the quenching temperature, for example, water or oil of 5 to 40 ° C. For example, when quenching the entire ball body, the entire ball body (excluding the handle portion of the ball body) may be selected to be immersed in the quenching medium for 5 to 30 seconds, preferably The entire ball body is immersed in the quenching medium for 20 seconds, thereby improving the deformation resistance of the manufactured golf head, so that the golf ball has a large amount of rotation when hit by the golf ball. (spin); and when the portion of the ball head body (ie, the ball striking panel portion, or the ball striking panel portion and the back portion) is quenched, the quenching medium can be sprayed toward the ball by a nozzle The head body (the injection amount per minute is about 5 to 20 L/min, so that the quenching treatment step can achieve a better rapid cooling efficiency, preferably 12 L/min), and the quenching treatment is performed on the shot panel portion. The elastic deformation ability of the manufactured golf club head is improved, and by simultaneously quenching the ball striking panel portion and the back portion, a golf club head having a hard front and rear and a softer middle portion can be obtained, so that the golf ball is made When the club head hits, It is easy for the golf ball to be hit to have a large back spin.

By the above quenching treatment step, the surface hardness of the ball head body can reach HV 267-700, the tensile strength of the ball head body can reach 240-310 ksi, and the ball head body has a lodging strength of 200~. 240ksi, thus it is possible to finally obtain a golf club head with high surface hardness and high surface strength.

In addition, the golf club head manufacturing method of the present invention may further comprise a groove forming method. In the step, a plurality of line grooves are formed on the ball striking panel portion of the ball head body.

In the golf club head manufacturing method, the trench forming step may be performed after the forging step and before the quenching step; that is, after forging the ball head body, that is, the ball head body The ball striking panel portion forms the plurality of wire grooves. At this time, the plurality of wire grooves can be formed by press forming, and after the wire groove forming step, the ball head body is reheated (for example, by high-frequency heating) The ball head body is configured to perform the quenching process step; in the embodiment, the plurality of wire grooves are formed under the conditions of a pressure of 250 to 350 T and a pressing time of 1 to 5 sec, and the ball head body is continuously clamped. The ball head body is moved at a speed of 3 to 10 mm/s, and after high-frequency heating, the high-frequency heating coil is removed, and the quenching process step is continued.

Alternatively, in the golf club head manufacturing method, the forging step, the quenching treatment step, and the trench forming step may be sequentially performed. At this time, the ball head body having the high surface strength after the quenching treatment is performed. Since the high surface hardness is not suitable for forming the plurality of grooves by the press forming method described above, it is preferable to form the plurality of grooves in the ball striking panel portion of the ball body by a cutting method such as milling.

In order to confirm that the golf club head manufacturing method of the present invention can be manufactured by the quenching treatment step to obtain a golf club head having enhanced surface hardness and surface strength, the following test was conducted.

(A) Mechanical properties

In this test, SUP10 spring steel material is selected as the spring steel bar, which is forged into the ball head body at the forging temperature of 900~950 °C (Group A1) or 800~850 °C (Group B1), respectively. The quenching treatment is carried out at a quenching temperature of 900 to 950 ° C (Group A1) or 800 to 850 ° C (Group B1), and finally the golf club head is tested for tensile strength, lodging strength and hardness. Table 2. In this test, a golf club head (Group A0 and Group R0) which was not subjected to the quenching treatment was taken as a control group (that is, it was naturally cooled at room temperature).

Referring to Table 2, compared with the A0 and B0 groups of natural cooling, the A1 and B1 groups subjected to the quenching treatment can indeed improve the tensile strength, the lodging strength and the hardness, and the golf club head of the present invention is confirmed. The manufacturing method can improve the surface hardness and surface strength of the obtained golf club head.

(B) hardness distribution

This test is based on the golf club head made by the golf club head manufacturing method of the present invention, and measures the hardness distribution of the depth. The depth referred herein refers specifically to the hitting surface of the golf club head (ie, The depth at which the ball striking panel portion contacts the outer surface of the golf ball toward the center of the golf club head.

Referring to FIG. 1, the broken line is the hardness of the ball body obtained through the forging step, which is about 215 HV; and the hardness of the golf club head adjacent to the ball striking surface after the quenching step is It can be lifted by 1.8 to 2.75 times, and the hardening depth is less than 0.9 mm (as shown by the solid line in Fig. 1), so that the golf club head manufacturing method of the present invention is improved in the surface hardness and surface strength of the golf club head obtained.

In summary, the golf club head manufacturing method of the present invention can change the crystal phase of the ball head body by quenching the ball body, thereby improving the surface hardness and surface strength of the obtained golf club head. , is the effect of the invention.

The golf club head obtained by the golf club head manufacturing method of the present invention can replace the conventional two-piece club head because of the enhanced surface hardness and surface strength, and at the same time, the conventional two pieces are obtained compared with the manufacturing. In the conventional golf club head manufacturing method of the club head, the golf club head manufacturing method of the present invention reduces the welding process, thereby not only achieving the effect of reducing the manufacturing complexity, but also achieving the effect of reducing the manufacturing cost.

While the invention has been described in connection with the preferred embodiments described above, it is not intended to limit the scope of the invention. The technical scope of the invention is protected, and therefore the scope of the invention is defined by the scope of the appended claims.

Claims (8)

A golf club head manufacturing method includes: forging a spring steel bar into a ball head body, wherein the ball head body has a pair of ball striking panel portions and a back, the spring steel bar body comprises a weight The percentage is 0.8~1.1% chromium, 0.65~0.95% manganese, 0.47~0.55% carbon, 0.15~0.35% bismuth, 0.15~0.25% vanadium, 0.03% below sulfur, 0.03% below phosphorus, 0.05% or less of oxygen, 0.05% or less of nitrogen and a balance of iron; and the ball head body is subjected to a quenching temperature of 800 to 1000 ° C, and a quenching medium is sprayed toward the ball head body by a nozzle to perform a Quenching treatment, the quenching medium is a fluid having a temperature of 5 to 40 ° C, and the injection amount per minute of the nozzle is 5 to 20 L/min, so that the surface hardness of the ball head body reaches HV 267-700 and the tensile strength reaches 240. ~310ksi, the drop strength is 200~240ksi. The golf club head manufacturing method according to claim 1, wherein the quenching treatment is performed on the entire ball head body. The golf club head manufacturing method according to claim 1, wherein the quenching process is performed on the ball striking panel portion of the ball head body. The golf club head manufacturing method according to claim 3, wherein the quenching treatment is performed on the back of the ball head body. The golf club head manufacturing method according to any one of claims 1, 2, 3, and 4, wherein after the forging of the ball head body, the ball striking panel portion of the ball head body is formed. The plurality of trenches continue to cause the ball head body to perform the quenching treatment at the quenching temperature. The golf club head manufacturing method according to claim 5, wherein the ball striking panel portion of the ball head body is pressed to form the plurality of wire grooves. A golf club head system as claimed in any one of claims 1, 2, 3 and 4. In the manufacturing method, after the ball head body is subjected to the quenching treatment, a plurality of line grooves are formed on the ball striking panel portion of the ball head body. The golf club head manufacturing method according to claim 7, wherein the ball striking panel portion of the ball head body is milled to form the plurality of wire grooves.