Gear machining apparatus and gear machining method

A gear machining apparatus configured to generate a gear tooth to a workpiece, the gear machining apparatus comprising:

• a rough working tool having a cylindrical tool main body, and a plurality of replaceable tool blades formed in a shape that is not based on a finished shape of a tooth surface of the gear tooth and attached to the tool main body, such that the tool blades are arranged in a circumferential direction of the tool main body and a blade tip of each of the tool blades is oriented outward in a radial direction of the tool main body;
• a finish working tool having a cylindrical tool main body, and a plurality of tool blades provided to the tool main body, such that the tool blades are arranged in the circumferential direction of the tool main body and a blade tip of each of the tool blades are oriented outward in the radial direction of the tool main body;
• a tool spindle which rotatably supports each of the rough working tool and the finish working tool;
• a workpiece spindle which rotatably supports the workpiece and is relatively movable to the tool spindle;
• a tool magazine which is capable of housing the rough working tool and the finish working tool;
• a tool changer which is configured to replace the rough working tool and the finish working tool with respect to the tool spindle;
• a rough machining controller which is configured to control to perform a rough machining on the workpiece, such that the rough working tool is rotated on a center line in an axial direction of the rough working tool, the workpiece is rotated on a center line in axial direction of the workpiece, and the rough working tool is relatively moved to the workpiece along the center line in the axial direction of the workpiece;
• and
• a finish machining controller which is configured to control to perform a finish machining on the workpiece, such that the finish working tool is rotated on a center line in an axial direction of the finish working tool, the workpiece is rotated on the center line in the axial direction of the workpiece, and the finish working tool is relatively moved to the workpiece along the center line in the axial direction of the workpiece.