The application discloses a
machining method of a casing inner cavity weight-reducing groove and a casing, and the
machining method comprises the following steps: using a
milling cutter with a
diameter greater than twice the radial allowance width of the casing inner cavity weight-reducing groove, and extending the
milling cutter into the casing inner cavity along an axial direction; adopting a
deep hole peck drilling mode to perform axial plunge milling along the weight-reducing groove, and performing interval plunge milling along a circumferential direction for multiple times to form a plurality of lace grooves and
assembly bosses; wherein, when the axial plunge milling is performed, the circumferential direction and the width direction of the radial allowance of the weight-reducing groove are combined into one layer and are milled through by one cutter. The
machining method adopts the
milling cutter with the
diameter greater than twice the radial allowance width, improves the
cutting force of the cutter, and reduces vibration and the phenomenon of broken edges in the
machining process; the machining method adopts the machining mode of one cutter from top to bottom to penetrate and mill the circumferential direction and the width direction, improves the machining efficiency, and the main stress of the milling cutter in the drilling and milling process is an
axial force, so that the acting force on the radial
cutting force of the
machine tool is greatly reduced, and the deformation of the casing can be reduced.