Co-forged golf club head and method of manufacture
View Patent ↗A co-forged iron type golf club is disclosed. More specifically, the present invention discloses a co-forged iron type golf club with the body portion made out of a first material and at least one weight adjustment portion monolithically encased within the body portion of the co-forged iron type golf club head without the need for secondary attachment or machining operations. The present invention creates of an iron type golf club head from a pre-form billet that already contains two or more materials before the actual forging process resulting in a multi-material golf club head that doesn't require any post manufacturing operations such as machining, welding, swaging, gluing, and the like.
1. A forged golf club head comprising:
a body portion having a striking surface made out of a first material; and
at least one weight adjustment portion made out of a second material encased within said body portion;
wherein said at least one weight adjustment portion is encased monolithically within said body portion without any secondary attachment operations, and
wherein said first material has a first flow stress at a first forging temperature, and said second material has a second flow stress at a second forging temperature; said first flow stress and said second flow stress are substantially the same with one another.
2. The forged golf club head of claim 1 , wherein said first forging temperature and said second forging temperature are substantially the same with one another.
3. The forged golf club head of claim 2 , wherein said first forging temperature is about 1,200° C., and said second forging temperature is about 1,100° C.
4. The forged golf club head of claim 1 , wherein said first flow stress and said second flow stress are different from one another.
5. The forged golf club head of claim 4 , wherein said first flow stress is about 10 ksi and said second flow stress is about 12 ksi.
6. The forged golf club head of claim 1 , wherein said first material has a first thermal expansion coefficient, and the second material has a second thermal expansion coefficient;
wherein said first thermal expansion coefficient is greater than or equal to said second thermal expansion coefficient.
7. The forged golf club head of claim 6 , wherein said first thermal expansion coefficient is about 8.0 μin/in ° F., and said second thermal expansion coefficient is about 6.1 μin/in ° F.
8. A forged golf club head comprising:
a body portion having a striking surface made out of a first material; and
at least one weight adjustment portion made out of a second material encased within said body portion;
wherein said at least one weight adjustment portion is encased monolithically within said body portion without any secondary attachment operations,
wherein said first material has a first thermal expansion coefficient, and the second material has a second thermal expansion coefficient; said first thermal expansion coefficient is greater than or equal to said second thermal expansion coefficient
wherein said first material has a first flow stress at a first forging temperature, and said second material has a second flow stress at a second forging temperature, and
wherein said first flow stress and said second flow stress are different from one another.
9. The forged golf club head of claim 8 , wherein said first thermal expansion coefficient is about 8.0 μin/in ° F., and said second thermal expansion coefficient is about 6.1 μin/in ° F.
10. The forged golf club head of claim 8 , wherein said first flow stress is about 10 ksi and said flow stress is about 12 ksi.
11. The forged golf club head of claim 10 , wherein said at least one weight adjustment portion is located near a sole of said golf club head.
12. The forged golf club head of claim 11 , wherein said at least one weight adjustment portion is located near a heel portion of said sole of said golf club head.
13. The forged golf club head of claim 12 , wherein said at least one weight adjustment portion is located near a toe portion of said sole of said golf club head.
14. The forged golf club head of claim 13 , wherein an interface between said body portion and said at least one weight adjustment portion creates an irregular interface.