The circumferential feed of numerical control machine tool is finished by circumgyrate workbench

The circumferential feed of numerical control machine tool is finished by circumgyrate workbench, call numerical control the four-axle of the machine tool: Circumgyrate workbench but with X, Y, Z3 reference axis linkage, machine thereby piece all sorts of curve of ball, circular arc. Circumgyrate workbench can realize accurate automatic graduation, enlarged the size range of pipe bent of numerical control machine tool. Workbench of numerical control circumgyrate basically is used at numerical control boring machine and milling machine, its appearance and general workbench are almost same, but the drive means that its drive is servo. It but with linkage of axis of other servo feed. Dislocation of its feed, graduation and fixed position locking are by given the instruction has pilot. The motion of circumgyrate workbench is by servo electromotor, to eliminate worm deputy transmission clearance, use double pitch gradually thick worm, the axial position that adopts mobile worm adjusts clearance. The mask of or so two side of this kind of worm has different pitch, consequently worm transverse tooth thickness is added gradually from A to Z thick. But because be the same as the pitch of a side,be identical, still can maintain normal clench the teeth so. When circumgyrate workbench is dormant, must want to be in locking condition. For this, in worm wheel bottom radiation direction contains 8 pairs of clamp are made of baked clay, go up in base all cloth is same crock of little hydraulic pressure. When crock of little hydraulic pressure on antrum puts through when pressure is oily, the piston is pressed to steel ball, maintain clamp tile, and clamp worm wheel. Revolving time needs in workbench, make above all of crock of little hydraulic pressure on antrum puts through an oil path, below the action of bedspring, steel ball is raised, clamp tile loosens worm wheel. The slideway face of circumgyrate workbench is by bearing of large scroll bearing, and the centre of turning circle that by conic roller bearing and biserial bearing of afferent and columnar roller maintains accurate. The fixed position precision of workbench of numerical control circumgyrate basically is to depend on worm deputy transmission precision, must want to use high accuracy worm consequently deputy. In system of half closed-loop control, after can measuring error of fixed position of workbench static state actually, affirmatory need compensates the position of angle and compensatory value, memory is in compensation loop, it is by numerical control device is undertaken the error is compensated. In system of full closed-loop control, give out workbench to reach the designated position accurately by the round grating of high accuracy signal, feedback to undertake controlling to numerical control device again. Workbench is set at 0 o'clock, when it makes a 0 motion, use above all block switch of the spacing below iron pressing, rotatory workbench falls fast, issue null signal by round grating or coder again next, rotatory workbench stops well and truly in null. Workbench of numerical control circumgyrate can make the circumgyrate of aleatoric angle and graduation, also can make motion of successive circumgyrate feed. CNC Milling