A method for manufacturing a golf club head includes providing a club head body produced by electric smelting an alloy base material including 0.04-0.07 wt % of carbon, 0.5-1.0 wt % of manganese, 0.5-1.0 wt % of silicon, less than 0.04 wt % of phosphorus, less than 0.03 wt % of sulfur, 15-17.7 wt % of chromium, 3.6-5.1 wt % of nickel, 2.8-3.5 wt % of copper, with the rest being iron and inevitable impurities. A solid solution treatment is proceeded at 1020-1080 C. for 80-100 minutes to form austenite and martensite in the club head body. A deep cooling treatment is proceeded between 120 C. and 80 C. for 7-9 hours to turn the austenite in the club head body into martensite. An aging treatment is proceeded on the club head body at 460-500 C. for 210-270 minutes to provide a hardness of HRC 36-46. A hosel is heated with high frequency waves at 900-1000 C. to posses a hardness lower than HRC 20.

A method for manufacturing a golf club head includes providing a club head body produced by electric smelting an alloy base material including 0.04-0.07 wt % of carbon, 0.5-1.0 wt % of manganese, 0.5-1.0 wt % of silicon, less than 0.04 wt % of phosphorus, less than 0.03 wt % of sulfur, 15-17.7 wt % of chromium, 3.6-5.1 wt % of nickel, 2.8-3.5 wt % of copper, with the rest being iron and inevitable impurities. A solid solution treatment is proceeded at 1020-1080 C. for 80-100 minutes to form austenite and martensite in the club head body. A deep cooling treatment is proceeded between 120 C. and 80 C. for 7-9 hours to turn the austenite in the club head body into martensite. An aging treatment is proceeded on the club head body at 460-500 C. for 210-270 minutes to provide a hardness of HRC 36-46. A hosel is heated with high frequency waves at 900-1000 C. to posses a hardness lower than HRC 20.

A swing roller skate with a novel manufacturing process includes: an aluminum insert, a panel, an anti-wear bar, a lower bearing, an upper bearing, an insert plastic wheel fork, a PU wheel and an insert cap, wherein: the aluminum insert is injection-molded into the panel; a front portion of the panel forms a pole, a front end forms a cylinder, a rear portion forms a flat cylinder, a rear end forms a cylinder, and a middle forms a circular sheet; top side holes and bottom side holes are drilled at the front end and the rear end of the panel, and through holes are provided between the top side holes and the bottom side holes; two oval holes are drilled at a circular bottom face of the plane, the anti-wear bar is provided at two sides of a bottom face of the middle portion of the plane.

The present invention is directed to a set of golf clubs comprising long irons, mid irons and short irons. Preferably, the long and mid irons have a face stabilizing bar and back panel that have a plurality of apertures in the face stabilizing bar and/or the back wall.

The present invention is directed to a set of golf clubs comprising long irons, mid irons and short irons. Preferably, the long and mid irons have a face stabilizing bar and back panel that have a plurality of apertures in the face stabilizing bar and/or the back wall.

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.

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.

A method of manufacturing a golf club head comprising a plurality of structural connectors, and particularly solid rods proximate the face, is disclosed herein. The method comprises the steps of preparing a wax of a golf club head body, the body comprising first and second through-holes, a hollow interior, and first and second receiving pockets, preparing waxes of first and second solid rods, inserting the first solid rod wax into the first through-hole and seating its lower end in the first receiving pocket, inserting the second solid rod wax into the second through-hole and seating its lower end in the second receiving pocket, bonding each of the first and second solid rods to the body with an adhesive material to form a combined wax mold, and casting a golf club head from the combined wax mold.

A method of manufacturing a golf club head comprising a plurality of structural connectors, and particularly solid rods proximate the face, is disclosed herein. The method comprises the steps of preparing a wax of a golf club head body, the body comprising first and second through-holes, a hollow interior, and first and second receiving pockets, preparing waxes of first and second solid rods, inserting the first solid rod wax into the first through-hole and seating its lower end in the first receiving pocket, inserting the second solid rod wax into the second through-hole and seating its lower end in the second receiving pocket, bonding each of the first and second solid rods to the body with an adhesive material to form a combined wax mold, and casting a golf club head from the combined wax mold.

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.