1.Gear base:
The gear base surface refers to the end face of one side of the gear. When turning the end face after the gear is clamped once, the inner hole of the gear is turned at the same time, that is, the end face formed by turning the inner hole and the end face with one knife.
2.Identification of gear base
(1) For parts with workpiece weight ≤ 10kg (usually such workpieces have no lifting holes), the method of marking on one side shall be adopted, that is, lettering shall be conducted in the ring groove of the non base side face, and the base side face shall not be equipped with 90 ° V-shaped base line.
(2) For parts with a workpiece weight of more than 10kg (usually these workpieces have lifting holes), the method of base plane identification is adopted, that is, turn a base plane line (marking circle) of 90 ° V shape 0.5mm deep at the center line of lifting hole on the base plane side of the workpiece, and there is no identification (not turning the base plane line) on the non base plane side, but the lettering shall be made in the ring groove on the end surface of the non base plane side.
As shown in the figure below:
3.Base surface identification method
(1) Through the description of gear base identification to identify the workpiece base.
(2) The outer circle end face of the base side is the smooth surface, and the outer circle end face of the non base side is the black surface. This method is used as an assistant judgment, not as a standard to identify the base surface.
(3) No tapped holes shall be made on the base surface side.
(4) The outer ring end face and the inner ring end face on the base side have the requirements for the accuracy of the circular runout position. (the circular run out tolerance is the maximum variation allowed by the indicator value when the measured element rotates around the reference axis for one cycle at a fixed reference point (there is no axial displacement of parts and measuring instruments). Symbol ” “” Indicates.
4.Non base surface identification method
(1) The marked surfaces in the end ring groove are all non base surfaces.
(2) On the non base side, only the end face of the inner ring has the precision requirements for the position of circular runout.