Manufacturing method for a golf club head

A manufacturing method for a golf club head is disclosed. The golf club head is composed of a body and a reinforced plate secured to the body at a sweet spot of the golf club head. The reinforced plate is embedded in the body by friction welding. Whereby, the reinforced plate is securely integrated with the body and the head has a long term of use life.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, a golf club head in accordance with the invention is composed of a body ( 20 ), and a reinforced plate ( 10 ) integrated with the body ( 20 ) at a sweet spot ( 21 ) which is the best point for a golf player to strike a ball. The reinforced plate ( 10 ) is formed with the body ( 20 ) by friction welding. Referring to FIGS. 2 - 5 , the golf club head is made by the following process: a. Making the reinforced plate ( 10 ) and the body ( 20 ) respectively The reinforced plate ( 10 ) and the body ( 20 ) are made by casting or forging, wherein the major component of the reinforced plate ( 10 ) is the same metal as that of the body ( 20 ), but the reinforced plate ( 10 ) is of an increased hardness in respect to the body ( 20 ). b. Friction welding The reinforced plate ( 10 ) and the body ( 20 ) are respectively secured by clamps, and the reinforced plate ( 10 ) is aligned with the sweet spot ( 21 ) of the body ( 20 ). The reinforced plate ( 10 ) is turned with a high rotate speed of 3000 RPM (Revolutions Per Minute) to 20000 RPM and has a vertical pressure (P) exerted thereon, as shown in FIG. 3 . When the reinforced plate ( 10 ) touches the body ( 20 ), there is high speed frication to melt the interface areas between the reinforced plate ( 10 ) and the body ( 20 ). Under the vertical pressure (P), the reinforced plate ( 10 ) is embedded in the body ( 20 ) and integrated with the body ( 20 ). At the same time, burrs ( 200 ) are formed around the reinforced plate ( 10 ) due to the fit between the reinforced plate ( 10 ) and the body ( 20 ), as shown in FIG. 4 . c. Finishing The burrs ( 200 ) and the part of reinforced plate ( 10 ) protruded from the body ( 20 ) are removed by cutting tools to form a smooth surface on the head, as shown in FIG. 5 . From the above description, it is noted that the invention has the following advantages: 1. Because the reinforced plate ( 10 ) and the body ( 20 ) have the same major component of metal, they have substantial same expansion or contraction when the air temperature varies, so the reinforced plate ( 10 ) is does not separate from the body ( 20 ) in temperature change. 2. Because the reinforced plate ( 10 ) is embedded in the body ( 20 ) by friction welding without solder, there are no cracks, voids or gaps between the reinforced plate ( 10 ) and the body ( 20 ) otherwise occurring from cooling of the solder etc. It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.