Abstract:

To design of the fracture-splitting load and the prefabricated stress groove parameters of the reducer housing bearing seat， a theoretical method for calculating the upper limit load of the fracture splitting based on the small-scale yield fracture condition of elastoplastic fracture mechanics was proposed. By this method， the upper limit load of the simplified sample of the reducer housing bearing seat was calculated to be 538 kN. Finite element numerical models were established for simplified sample of the reducer housing bearing seat with pre-fabricated stress groove depth range of 0.8 mm~2.4 mm. Numerical simulation analysis were conducted on the initiation crack of fracture splitting. By the critical J-integral criterion， the crack initiation loads for the 0.8 mm~2.4 mm series groove depth were calculated. The lower limit for fracture splitting the reducer bearing seat under the load of 538 kN was determined to be 1.6 mm； Simplified samples were cast. And laser prefabricated stress grooves were made and the splitting processing experiments of the reducer housing bearing seat were done. The experimental load is 533.39 kN， and the groove depth is 2.0 mm； The maximum deformation of the bearing hole diameter after fracture splitting and assembly is 0.18 mm， which is less than 0.25 mm which is the allowable deformation of reducer housing bearing seat after fracture splitting. The above results can provide references for the fracture splitting process parameters of the reducer housing bearing seat， the selection of the cylinder and system pressure of the equipment， and the laser processing parameters of the prefabricated stress groove.

Key words: reducer housing bearing seat, fracture splitting, prefabricated stress groove, small-scale yield fracture, numerical simulation