Gear machining support device and gear machining device

A gear machining support device that supports machining when a tooth of a gear is machined on a workpiece by relatively moving the workpiece and a machining tool while synchronizing a rotation of the workpiece around a center axis line of the workpiece and a rotation of the machining tool around a center axis line of the machining tool, the gear machining support device comprising:

• a processor;
• and a memory storing instructions that, when executed by the processor, cause the gear machining support device to perform operations comprising:
• obtaining target modification amounts of at least two modification elements of a tooth surface shape of the tooth of the gear, the modification elements comprising crowning, bias, a helix angle, a pressure angle, and a tooth profile roundness;
• calculating a correlation between each of the modification elements of the tooth surface shape of the tooth of the gear and machining control elements based on a tooth surface shape of the gear obtained in response to changing only one of the machining control elements for each of the machining control elements, the machining control elements including a distance between centers of the center axis line of the machining tool and the center axis line of the workpiece, an intersection angle formed between the center axis line of the machining tool and the center axis line of the workpiece, an offset angle obtained when a machining point of the machining tool and the workpiece is deviated in a circumferential direction of the workpiece, and a rotation angle of the workpiece with respect to a rotation angle of the machining tool;
• and determining, based on the correlation, a correction amount of at least one of the machining control elements during a machining operation such that the at least two of modification elements approximate the respective target modification amounts.