An integral structure of a turn-milling complex
machining center is disclosed, characterized by a single post and feeding boxes hung at two sides. The left-suspending feeding box is provided with a B-axis cutter holder device with cutters at three locations. The B-axis cutter holder device is used for the working procedures for
crank machining like turning, milling, boring, deep-hole drilling, threading and the like. The right-suspending feeding box can be provided with a large-scale
milling cutter disc for external milling
machining of the
crank shaft. Two spindle boxes have two Cf-axis structures, the two spindle boxes are movable along a Z-axis on the
machine body, and the tip of the right spindle box is stretchable. The
machine is fitted with a plurality of hydraulic self-centering center rests that have high precision retentivity. A guide rail on the
machine body forms an
angle of inclination of 30 degrees with a horizontal plane, and the plane of the machine body is completely ground to ensure the absence of scraps and dead corners. The entire machine is fully protected. An inner cavity of the guide rail for the operation of the single post of the machine body is supported by double ribs, and two sets of corners remain stressed all the time in the process of the operation of the post. A front support bearing of the spindle employs an imported large-
diameter double-column cylindrical
roller bearing. The invention solves three problems and the machining for parts of a main journal and a connecting journal of the
crank prior to
grinding can be completed by one-time mounting on a machine, thus realizing high-precision and high efficient machining for the crank shaft of a medium speed machine for ships; in addition, the invention bears
heavy load and is fully-protected.