Aluminum alloy 7075-t7451 is selected as the material for splitting the wheel blank of straight bevel gear. This material is obtained by rolling, solid solution, quenching, pre stretching, aging and other methods of 7075 aluminum alloy raw materials. The treated material has high strength and toughness, and the overall performance of the material is excellent. The parts made of this material can operate stably under various working conditions. Through data query and stress measurement experiment verification, it is known that the residual stress of this material changes only along the thickness direction of straight bevel gear blank. Taking the splitting blank of straight bevel gear with thickness of 80mm as an example, the stress variation curves in rolling (length) direction and transverse (width) direction are shown in the figure.
The rolling direction of straight bevel gear split wheel blank is set as X direction and the transverse direction is set as y direction. It can be seen from the figure that the curves of the variation trend of the residual stress in both directions along the thickness direction of the straight bevel gear blank are similar to the “m” shape, and the neutral axis of the straight bevel gear blank section is symmetrically distributed. There is a large compressive stress near the upper and lower surfaces of the straight bevel gear blank, of which the maximum compressive stress in the X direction is -17.21mpa and the maximum compressive stress in the Y direction is -13.27mpa. The maximum tensile stress in X and Y directions is received at 20mm from the middle surface of straight bevel gear blank, in which the maximum tensile stress in X direction is 16.21mpa and the maximum tensile stress in Y direction is 13.84mpa. It can be seen from the figure that the stress near the middle surface of the straight bevel gear blank is small, which is due to the specific heat treatment method of the material used in the preparation process of the straight bevel gear blank.