STRIKING FACE OF A GOLF CLUB HEAD
Manufacturing methods for manufacturing a striking face of a golf club head. An example method includes: cutting a near-beta titanium alloy into a pre-forged face insert; providing the pre-forged face insert into a heating apparatus for a duration of less than 10 minutes; heating the pre-forged face insert to a temperature between about 740° Celsius (° C.) and 780° C.; forging the heated, pre-forged face insert to form a forged face insert; and attaching the forged face insert to a body of the golf club head to form the striking face of the golf club head.
1 . A method for manufacturing a striking face of a golf club head, the method comprising:
cutting a near-beta titanium alloy into a pre-forged face insert;
providing the pre-forged face insert into a heating apparatus for a duration of less than 10 minutes;
heating the pre-forged face insert to a temperature between about 740° Celsius (° C.) and 780° C.;
forging the heated, pre-forged face insert to form a forged face insert; and
attaching the forged face insert to a body of the golf club head to form the striking face of the golf club head.
2 . The method of claim 1 , wherein the pre-forged face insert has a thickness (T), and the forging causes a significant deformation to be formed in the forged face insert, the significant deformation including a protrusion having a depth (D) that is at least 25% of the thickness (T) of the pre-forged face insert.
3 . The method of claim 2 , wherein the protrusion depth (D) is less than 50% of the thickness (T) of the pre-forged insert.
4 . The method of claim 1 , wherein the duration is between 6-8 minutes.
5 . The method of claim 1 , wherein the titanium alloy has a molybdenum equivalency (MoE) of about 8 to about 10.
6 . The method of claim 1 , wherein the golf club head has a Strength over Hardness Ratio of greater than about 6.0 ksi/HRC, wherein the Strength to Hardness Ratio is defined as:
(
UTS
of
striking
face
portion
-
UTS
of
body
portion
)
(
Hardness
of
striking
face
portion
-
Hardness
of
body
portion
)
=
Strength
over
Hardness
Ratio
,
where UTS is Ultimate Tensile Strength.
7 . The method of claim 6 , wherein the golf club head has a Strength over Hardness Ratio of greater than about 11 ksi/HRC.
8 . The method of claim 1 , wherein the golf club head has a MOR Ratio of greater than about 1.25, the MOR Ratio defined as:
MOR
of
striking
face
portion
MOR
of
body
portion
=
MOR
Ratio
.
9 . The method of claim 8 , wherein the golf club head has a MOR Ratio of greater than about 1.35.
10 . A method for manufacturing a striking face of a golf club head, the method comprising:
cutting a titanium alloy into a pre-forged face insert, the titanium alloy has a molybdenum equivalency (MoE) of about 6 to about 10;
providing the pre-forged face insert into a heating apparatus for a duration of less than 10 minutes;
heating the pre-forged face insert to a temperature between about 740° Celsius (° C.) and 780° C.;
raw forging the heated, pre-forged face insert to form a raw-forged face insert;
providing the raw-forged face insert into the heating apparatus for a duration of less than 10 minutes;
heating the raw-forged face insert to a temperature between about 740° Celsius (° C.) and 780° C.;
detail forging the heated, raw forged face insert to form a detail-forged face insert; and
attaching the attaching the detail-forged face insert to a body of the golf club head to form the striking face of the golf club head.
11 . The method of claim 10 , wherein the titanium alloy has a molybdenum equivalency (MoE) of about 8 to about 10.
12 . The method of claim 10 , wherein the golf club head has a Strength over Hardness Ratio of greater than about 6.0 ksi/HRC, wherein the Strength to Hardness Ratio is defined as:
(
UTS
of
striking
face
portion
-
UTS
of
body
portion
)
(
Hardness
of
striking
face
portion
-
Hardness
of
body
portion
)
=
Strength
over
Hardness
Ratio
,
where UTS is Ultimate Tensile Strength.
13 . The method of claim 12 , wherein the golf club head has a Strength over Hardness Ratio of greater than about 11 ksi/HRC.
14 . The method of claim 10 , wherein the golf club head has a MOR Ratio of greater than about 1.25, the MOR Ratio defined as:
MOR
of
striking
face
portion
MOR
of
body
portion
=
MOR
Ratio
.
15 . The method of claim 10 , wherein the golf club head has a MOR Ratio of greater than about 1.35.
16 . A method of manufacturing a striking face of a golf club head, the method comprising:
cutting a near-beta titanium alloy into a pre-forged face insert having a thickness (T);
providing the pre-forged face insert into a heating apparatus for a duration between 6-8 minutes;
heating the pre-forged face insert to a temperature between about 740° Celsius (° C.) and 780° C.;
forging the heated, pre-forged face insert to form a forged face insert with a significant deformation, the significant deformation including a protrusion having a depth (D) that is at least 25% of the thickness (T) of the pre-forged face insert; and
attaching the forged face insert to a body of the golf club head to form the striking face of the golf club head.
17 . The method of claim 16 , wherein the near-beta titanium alloy has a molybdenum equivalency (MoE) of about 8 to about 10.
18 . The method of claim 16 , wherein the golf club head has a Strength over Hardness Ratio of greater than about 6.0 ksi/HRC, wherein the Strength to Hardness Ratio is defined as:
(
UTS
of
striking
face
portion
-
UTS
of
body
portion
)
(
Hardness
of
striking
face
portion
-
Hardness
of
body
portion
)
=
Strength
over
Hardness
Ratio
,
where UTS is Ultimate Tensile Strength.
19 . The method of claim 16 , wherein the golf club head has a MOR Ratio of greater than about 1.25, the MOR Ratio defined as:
MOR
of
striking
face
portion
MOR
of
body
portion
=
MOR
Ratio
.
20 . The method of claim 16 , wherein the protrusion depth (D) is less than 50% of the thickness (T) of the pre-forged insert.