The invention discloses a precision
machining method for high-precision U-shaped low-rigidity bearing
block type parts. The method comprises steps as follows: 1, materials are prepared; 2, rough
machining is performed, the parts are machined and shaped, and all outlines reserve the
machining allowance; 3, stress
ageing is eliminated, and the
residual stress produced by rough machining is eliminated; 4, semi-finish machining is performed, and except that assembling datum surfaces, mounting holes of bearings, end surfaces of the bearings and important mounting connecting holes reserve the machining allowance, other machining characteristics meet size requirements; 5, stress
ageing is eliminated again, and the
residual stress produced by semi-finish machining is eliminated; 6, finish machining is performed on the assembling datum surfaces, the mounting holes of the bearings, the end surfaces of the bearings and the important mounting connecting holes. The datum-uniform and datum-first principles are adopted in the process, auxiliary tools are designed to reduce trembling and improve the rigidity of the parts, meanwhile, the influence of machining elastic deformation is considered in control on central high sizes, and certain correction margins are reserved. With the method, the percent of pass of the high-precision U-shaped low-rigidity bearing
block type parts is guaranteed.