Gearbox as an important part of auto parts, the processing accuracy is particularly important; Wei-chi intelligent mechanical and electrical design for a factory in Chongqing, a set of non-standard hydraulic fixture shell, according to product structure characteristics, combined with design and processing force analysis, Fixture positioning clamping point selected in the appropriate location, the final parts after the workpiece deformation is less than 0.01mm, after processing to ensure product processing accuracy, while the fixture to meet the two products share.