Groovy turbine compose applies on library of knife of type of machining center tub wheel

4271 overviews machining center is to point to contain the numerical control machine tool that trades knife unit automatically. Trade knife unit automatically with the manipulator that change a knife by knife library normally two parts are comprised, also have two parts compositive comprise inorganic instrument hand to trade knife unit automatically together. All sorts of cutting tool that the knife library that trades knife unit automatically uses machine tool of store machining center to need in the place in machining a process. In changing knife course automatically, the statement picking a knife that requirement knife library can issue according to numerical control device singles out the cutting tool of a need, stop well and truly in change a knife locally, change automatically in order to facilitate cutting tool. The sort of knife library type of machining center machine tool is various, commonly box type of tub wheel type, chain, grid waits, among them library of knife of tub wheel type because its structure is simple, control is convenient, wide application was won on machining center machine tool. The circumgyrate drive means of library of knife of tub wheel type has two kinds normally, one kind is by servo electric machinery has drive through decelerate device; Another kind is to use compose of turbine of chamfer of the clench the teeth outside be being passed after decelerate of classics of common electric machinery to have drive. Former structure is simple, slewing speed is fast, location is exact, but because chose servo electric machinery, electric control is complex, production cost is high. Latter uses fixed position of mechanical means graduation, reliability is high, although fixed position precision is formerer low, but the requirement that can satisfy machining center machine tool completely. Because chose common electric machinery, electric control is simple, production cost is compared former low. Very much on the machining center machine tool of the warehouse of knife of tub wheel type that produces at present use groovy turbine compose to come the graduation circumgyrate of drive knife library moves. The working principle of compose of 2 chamfer turbine and compose of turbine of structural characteristic chamfer (weigh Maltese orgnaization again) can the divide evenly drive shaft fast the periodic intermittent motion that successive movement changeover is driven axis, commonly used in all sorts of graduation dislocation orgnaizations. Groovy turbine compose has 3 kinds of basic kinds: Outside compose of turbine of chamfer of clench the teeth, inside compose of turbine of chamfer of clench the teeth and compose of spherical chamfer turbine. Library of knife of type of machining center tub wheel is used outside compose of turbine of chamfer of clench the teeth. Compose of turbine of chamfer of clench the teeth works outside the principle is shown 1 times like the graph, it by arm (active brace) 1, groovy annulus 2, roller 3 stop with the lock dish of 4 composition. Graph 1 outside the arm circumgyrate axes of compose of turbine of chamfer of the clench the teeth outside graph of principle of compose of turbine of chamfer of clench the teeth and parallel of line of groovy metempsychosis runner shaft. Normally arm is made wait for fast circumgyrate, in entering groove when the roller on arm, unplug the rotate that move groove is retrorse dislocation moves, when roller from the emergence in groove, groovy annulus namely fall asleep, stop by the lock dish of fixed position. When having a roller only, arm turns a week, groovy rotate turns, the pace that stop takes campaign. Outside the structural characteristic of compose of turbine of chamfer of clench the teeth is as follows: (1) roller enters the instantaneous place with emergence notch, the central line photograph of arm center line and chamfer is perpendicular, make groovy annulus dislocation rises, the 0=0 of angular velocity ω that stops instantaneous, avoided rigid impact. (2) Z of number of groovy teeth of a cogwheel is 3 ～ 18. (3) since groovy annulus dislocation, the angular acceleration ε when stopping 0 with groove several Z are concerned, z is less, ε 0 bigger, have the soft impulse of different level namely. (4) the lock stops dish fixed position precision is low. Spend precision adequately when the demand is high, must add tabulator. (5) the structure is simple, it is easy to make, the job is reliable, mechanical efficiency is tall. 3 because the angular acceleration change of groovy annulus is bigger,reduce measure of percussive of motion of groovy turbine compose, and differ in the angular acceleration direction of the before half phase of dislocation process and second half phase, because this should be put when clearance between groove and roller, can produce impact. Take the following step to reduce concussion to answer: (1) reduce or eliminate the gap between roller and chamfer. (2) eliminate sell the space when beginning to enter groove, should make of groovy annulus actual outside round radius Ra is more than R of radius of the circle outside groovy annulus name slightly, take, the RA in type is roller radius, see a picture 2, in order to eliminate the roller when roller begins to enter groove and chamfer the clearance △ of two side top. Graph the sketch map 　 when 2 roller begin to enter groove (3) make groovy annulus has J2 of proper moment of inertia, make | J2 ε 2 | <Mz, mz is the laden torsion of groovy annulus. (4) the circumgyrate damp that raises groovy annulus package. 4 application example pursues the 3 structural diagram that are library of knife of type of tub wheel of TH5640 vertical machining center. Main element has: (1) knife library electric machinery; (2) reducer; (3) bracket; (4) brace; (5) knife handle; (6) groovy annulus; (7) tub wheel; (8) the lock stops dish; (9) roller; (10) knife detect switch; (11) sliding bearing; (12) rotor. Graph this knife library can hold sketch of structure of 3 knives library 18 cutting tool, namely the tine number of groovy annulus is 18. The circumgyrate of knife library chooses a knife to drive brace circumgyrate through reducer by knife library electric machinery, brace every circumgyrate a week, groovy cycle crosses 20 ° , cycle of knife library beat crosses a sword, stop by the lock dish of fixed position. The knife on knife library signal is given out jointly by two switch, a knife in knife library on installation blocks iron only, on bracket installation detects only switch (graph 3 in all did not express) , after the machine tool switchs on the mobile phone, automatic circumgyrate searchs knife warehouse a knife (fiducial knife) , when a knife go up block iron to spark on bracket detect library of the knife after switch stops turn, the current knife of knife library for a knife, knife library is in initiative condition. The others knife signal is in by installation on brace block iron to spark knife detect switch 10 have accumulative total count, brace every circumgyrate a week namely knife library has turned a knife spark. Through controlling the direction of rotation of knife library electric machinery, those who realize knife library is two-way pick a knife. To reduce the concussion noise in the process of the dislocation that pick a knife of knife library, following a few step were taken on the design. (1) make of groovy annulus actual outside round radius is more than radius of the circle outside name slightly. R=150 of radius of the circle outside groovy annulus name.

Cos10 ° =147.

72, actual outside round radius. (2) through adjusting the thrust of two planar bearing, the circumgyrate that raises groovy annulus package appropriately is laden, choose aluminium alloy material to make knife library tub wheel at the same time, rotor uses hollow structure, reduce the moment of inertia of groovy annulus component. (3) the radial bearing bearing of rotor is sliding bearing, choose get together 4 fluorine ethylene regards bearing as material, make the clearance of bearing is 0, increase the circumgyrate damp of groovy annulus component. Through taking above step, the good point that using groovy turbine form while overcame the weakness with its structure inherent itself, obtained very good practical effect. CNC Milling CNC Machining