JP2014200268A - Iron golf club head - Google Patents

Abstract

A low-center-of-gravity cavity type iron golf club head called a pocket type manufactured by forging, which provides an iron golf club head excellent in feel at impact when a ball is hit. SOLUTION: It is integrally formed by forging, and is formed with a top part 2 at the top, a face part 3 at the front part, a sole part 4 at the bottom part, a back part 5 at the rear part, and a back part 5 toward the face part 3. A main recess 7 and a recess 8 formed from the main recess 7 toward the sole portion 4. The recess 8 was formed by bending. [Selection] Figure 1

Description

  The present invention relates to an iron golf club head manufactured by forging.

  Iron golf club heads are roughly classified into muscle type and cavity type according to the shape of the back surface. The cavity type includes an undercut type and a pocket type.

  The muscle type iron head is also called a blade type or a flat back, and the conventional back surface has a relatively flat shape. Although this muscle type iron head has a feature that it has a good hitting feeling when hit with a so-called sweet spot, it has a high center of gravity and a small moment of inertia, so it is a difficult shape for a general golfer to use.

  On the other hand, the cavity type is a relatively new iron head and has a shape in which a recess is provided on the back surface of the head. This cavity type iron head is slightly inferior to the muscle type in hitting feeling, but the head weight reduced by the formation of the recess on the back surface is distributed to the periphery of the back surface, so the sweet spot is wide, and In addition, there is a feature that there is little blurring of the head when the moment of inertia is large and the hit ball deviates from the sweet spot.

  Among the cavity types, the undercut type has a concave portion expanded from the main concave portion of the back surface toward the sole. In addition, the pocket type is a new type of iron head that has recently appeared, and is an undercut type recess that extends from the main recess on the back surface toward the sole, and is further enlarged toward the sole. The shape of the recessed portion is like a pocket. Since these types of iron heads can freely distribute the head weight reduced by the formation of the recessed portion enlarged toward the sole, the degree of freedom in designing the center of gravity, for example, lowering the center of gravity is improved. Thereby, it can be set as a golf club easy to handle for a general golfer.

  By the way, when these undercut type and pocket type iron heads are manufactured by forging, a method of joining a face part and a main body part separately manufactured in advance by welding is generally used (see, for example, Patent Document 1). . However, it is difficult to completely join the joint surfaces by welding, and there is a part that remains as a very small gap without being joined after welding. For this reason, there was a drawback that the shot feeling when hitting the ball was poor.

JP 2006-223686 A

  An object of the present invention is to provide a low center of gravity cavity type iron golf club head called a pocket type manufactured by forging, and to provide an iron golf club head excellent in feel at impact when a ball is hit.

  The iron golf club head according to claim 1 of the present invention is integrally formed by forging, and includes a top part at the top, a face part at the front part, a sole part at the bottom part, a back part at the rear part, and the face part at the back part. It has a main recessed part formed toward the part and a recessed part formed from the main recessed part toward the sole part, and the recessed part is formed by bending.

  The iron golf club head according to claim 2 of the present invention is characterized in that, in claim 1, the concave portion is formed without going through any of the steps of cutting and joining.

  The iron golf club head according to claim 3 of the present invention is characterized in that, in claim 1 or 2, forge lines are continuously present from the top portion to the face portion, the sole portion, and the back portion. Features.

  The iron golf club head according to claim 1 of the present invention has a main concave portion and a concave portion, so that it can have a low center of gravity. Since the concave portion is formed by bending, it has an excellent shot feeling when hitting a ball.

  Moreover, according to the iron golf club head of the second aspect of the present invention, since the recess is formed without going through any of the steps of cutting and joining, it can be manufactured at low cost.

  Moreover, the iron golf club head according to claim 3 of the present invention has high strength because the forged lines are continuously present from the top portion to the face portion, the sole portion, and the back portion.

FIG. 3 is a plan view when the back portion is viewed from a direction perpendicular to the face surface of the iron golf club head of Example 1. It is a top view when seeing a top part from the direction parallel to a face surface same as the above. It is the sectional view on the AA line of FIG. 1 same as the above. It is a top view when a back part is seen from the direction perpendicular | vertical to the face surface before a bending process same as the above. It is a top view when a top part is seen from the direction parallel to the face surface before a bending process same as the above. It is AA sectional view taken on the line of FIG. 4 same as the above.

  Hereinafter, embodiments of the iron golf club head of the present invention will be described with reference to the accompanying drawings.

  In FIGS. 1-3 which show the iron golf club head of a present Example, 1 is the iron golf club head (henceforth a "head") integrally formed by forge, and the head 1 has the top part 2 on the upper part. The front portion includes a face portion 3, the bottom portion includes a sole portion 4, and the rear portion includes a back portion 5. Further, the head 1 has a hosel portion 6 into which a shaft is inserted on one side portion. The top portion 2 forms a top surface 21 as an upper surface of the head 1, the face portion 3 forms a face surface 31 as a front surface of the head 1, and the sole portion 4 forms a sole surface 41 as a bottom surface of the head 1. The back portion 5 forms a back surface 51 as the back surface of the head 1.

  A main recess 7 is formed in the back portion 5 toward the face portion 3. The main recessed portion 7 has a shape recessed forward from the back surface 51 toward the face portion 3. The main recess 7 is also called a cavity because it has a cavity shape. A recess 8 is formed from the main recess 7 toward the sole portion 4. The concave portion 8 has a shape that is recessed downward from the main concave portion 7 toward the sole portion 4, and is surrounded by the lower portion of the face portion 3, the sole portion 4, and the back portion 5. The recess 8 is also called a pocket because it has a pocket shape.

  The recess 8 is formed by bending. Hereinafter, the formation method of the recessed part 8 is demonstrated.

  4 to 6 show the head 1a before bending. The head 1a is formed by forging using, for example, S20C as a material. 4-6, the same code | symbol is attached | subjected to the same part as FIGS. 1-3.

  An extending portion 9 is provided so as to extend rearward from the sole portion 4. The extending portion 9 has a relatively thin tongue shape. Further, a groove portion 10 for facilitating bending is formed at the connecting portion between the extending portion 9 and the sole portion 4. Further, notches 11 are formed at two locations in the back portion 5. This is formed in advance so as not to interfere with the back portion 5 when the extending portion 9 is bent.

  In the bending process, the extending portion 9 is bent at a substantially right angle at the position of the groove portion 10 using a press so that the tip of the extending portion 9 faces the top portion 2. Thus, the back surface 51 is formed by the extended portion 9 and the pocket-shaped concave portion 8 is formed. In this way, the recess 8 is formed only by bending without passing through any of the steps of cutting and joining. For this reason, there are continuous forging lines from the top part 2 to the face part 3, the sole part 4, and the back part 5.

  The manufacturing process other than the bending process is the same as the manufacturing process of the usual conventional iron golf club head, and thus the description thereof is omitted.

  Next, with respect to the head 1 of the present example that was actually created, in order to evaluate the hit feeling when the ball was hit, a sound analysis was performed. In the sound analysis, the frequency component of the sound emitted when the ball was hit was measured, and the frequency of the component with the highest sound pressure was obtained. For comparison, the same evaluation was performed using conventional muscle type, cavity type, and pocket type heads. In addition, the height of the center of gravity of the head was measured. The results are shown below.

  The muscle type has a relatively flat back surface, and the cavity type has a recess in the back surface of the head and the recess is not undercut. Pocket type Is a shape in which a pocket-shaped recess is provided from the main recess on the back surface toward the sole. Further, the pocket type of the comparative example is obtained by joining the face portion and the main body portion by welding.

  From this result, it was confirmed that the feel at impact of the head 1 of this example is close to that of the muscle type and is good. In addition, it was confirmed that the height of the center of gravity of the head 1 of this example is close to that of the pocket type and has a low center of gravity.

  As described above, the iron golf club head 1 of the present embodiment is integrally formed by forging, and includes a top part 2 at the top, a face part 3 at the front part, a sole part 4 at the bottom part, a back part 5 at the rear part, and The back portion 5 has a main recess 7 formed toward the face portion 3 and a recess 8 formed from the main recess 7 toward the sole portion 4, and the recess 8 is formed by bending. In addition, since the main recess 7 and the recess 8 are provided, the center of gravity can be lowered, and the recess 8 is formed by bending, so that it is excellent in feel at impact when a ball is hit.

  Moreover, since the said recessed part 8 was formed without passing through any process of cutting and joining, it can manufacture at low cost.

  In addition, since forged lines are continuously present from the top portion 2 to the face portion 3, the sole portion 4, and the back portion 5, the strength is high.

  In addition, this invention is not limited to said embodiment, A various deformation | transformation implementation is possible. For example, the notch 11 may be filled by welding after bending.

1 Iron golf club head (head)
2 Top part 3 Face part 4 Sole part 5 Back part 7 Main recessed part 8 Recessed part

Claims (3)

The main part is formed by forging, the top part is the top part, the front part is the face part, the bottom part is the sole part, the back part is the back part, and the main part is formed in the back part toward the face part and the main concave part An iron golf club head having a recess formed toward the sole portion, and the recess formed by bending. 2. The iron golf club head according to claim 1, wherein the concave portion is formed without going through any of the steps of cutting and joining. 3. The iron golf club head according to claim 1, wherein forging lines are continuously present from the top portion to the face portion, the sole portion, and the back portion.

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