1. The tooth surface of the driving wheel of the precision reducer meshes with the tooth surface of the driven wheel, and the driving wheel is coated with a thin film coating, and one tooth is coated with a thin film coating every 120 degrees along the circumferential direction of the driving wheel. A total of 3 teeth are coated, and the contact is observed after meshing. Whether the spots are qualified, whether there is film coating on the tooth surface in the contact area of ​​the driven wheel, and whether there is floating phenomenon in the contact spots.

　　2. Use white sticker glue on the non-meshing contact spot position on the tooth surface of the driven wheel along the tooth length. The tooth height direction should be pasted on the involute part, that is, the meshing area, and then meshing and coloring until the involute on the paper Partially covers the meshing contact spots.

　　3. Remove the sticker of the precision reducer and measure the thickness of the sticker with a micrometer, calculate the repair amount and helix angle change data based on the thickness, and then input the data into the forming mill to grind the tooth surface.

　　Among them, the sticker thickness is δmm, the tooth width is B mm, the repair amount is the amount of grinding off each side δmm, the helix angle variation is arctan(δ/B)mm, and the helix angle is judged according to the rotation direction of the driving wheel. Increase or decrease.

　　The forming mill is a kind of numerical control gear grinding equipment. The parts are calibrated in advance, and then the gear grinding program is set and the forming tooth profile can be processed according to the program. The third step to repair the contact spots is the “repair” calculated by the forming mill according to the calculation. Volume and helix angle change data".

　　The precision reducer is input into the gear grinding program and repaired according to the modified program, then the contact spots can be repaired to complete the repair process.

　　The thin film coating is commonly called red lead powder and is composed of lead tetroxide.The thickness δ of the precision reducer sticker is less than 0.4mm, otherwise it will affect the position of the contact spots and the meshing gap after grinding, and accelerate the wear of the gear.