Gear grinding allowance adjusting method

The invention discloses a gear grinding allowance adjusting method. The method comprises the following steps: mounting and aligning: performing metering and aligning on a to-be-ground gear which is processed in advance and is provided with an aligning reference by utilizing a supporting and adjusting system with axial and radial adjustable components on a horizontal rotary worktable of a grinding machine; performing full-tooth tooth surface detection: performing full-tooth tooth surface scanning on the to-be-ground gear through a three-dimensional scanner, and forming detection data associated with the position vector of the adjustable component in the supporting and adjusting system; performing data processing: processing the detection data by adopting an iterative operation mode through a computer according to a mathematical model constructed in advance based on preset constraint conditions, and forming an adjustment scheme with adjustment parameters; and performing gear installation and adjustment: adjusti