U-CENTER. NC heads for facing, boring, threading and radiusing for machining centres

Transcription

1 U-CENTER NC heads for facing, boring, threading and radiusing for machining centres 8

2 U-CENTER General features o A U-CENTER U-CENTER boring and facing heads are designed for use on machines with automatic tool change, thus essentially on machining centres. The feed movement of the toolholder slide and the tool position, even during rotation, is controlled by a U-DRIVE motor drive unit. This unit is managed directly by an axis, known as U, of the machining centre numerical control. 3 CNC X Y Z 6 A machining centre set up in this way allows to carry out a series of different tooling procedures such as inner and outer turning, cutting grooves, tapered bores (even variable), concave and convex spokes, cylindrical and tapered threading, phonographic spirals, etc. W U 5 1. Power take-off. Servomotor 3. Transducer 4. Limit microswitches 5. Arbor 6. U-CENTER head 3 KINEMATIC SYSTEM OF THE U-CENTER The kinematic system of all U-CENTERS is made up of a differential unit where one revolution of the power takeoff A corresponds to one.5 mm radial shift of the slide. The maximum allowed rate of RPM at power take-off corresponds to a slide feed speed of 5 mm/min. The rated torque necessary for power take-off is Nm. Between the servomotor mounted in the U-DRIVE unit and the toolholder slide of the U-CENTER is a radial reversal play of approximately.5 mm, thus in order to be precise positioning must take place in a single direction, and be included during programming.

3 General features D ANDREA COMPONENTS 1. Stationary body. Rotating body 3. Tool slide 4. Interchangeable arbor 5. Counterweights 6. Toolholders with interchangeable head 7. Coolant outlets 8. Power take-off A ; locking-release system ensures that the rotating body is secured to the fixed body when the U-CENTER is automatically removed from the spindle of the machining centre and placed in the tool magazine. BALANCING U-CENTER heads are designed with two counterweights (5) for automatic balancing, which move in the opposite direction to the slide (3) to allow to work at a high RPM without noticeable sways. The balanced heads are especially suited for precision tooling and to create diameters that require high rotation speed. A

4 U-CENTER U-DRIVE fig. 3 The U-DRIVE unit has to be properly mounted on the machine s headstock to allow for a safe engagement with the U-CENTER head (fig.3). The U-DRIVE unit contains the U axis servomotor (1), a transducer (), the end of stroke (3), zero reference proximity switches and the drive system to the U-CENTER head. The U-DRIVE can take different patterns according to the application on the machining centre; the most common are: angle (fig.4) or in line (fig.5) fig. 4 fig. 5

5 Assembly D ANDREA ASSEMBLY The manufacture and installation of the U-DRIVE must observe the measurements and tolerances indicated on the drawings. DATA 1. Spacer to adapt the U-DRIVE according to the measurement (X+.5) mm. Preload spring (max load N) 3. Air intake for cleaning the power take-off 4. Wedge clutch axial stroke from 1 to mm 5. Spring (max load 5 N) 6. Rotation lock disengage stroke 7. Lock-release lever 8. Reference peg 9. Positioning ring A. Distance between the taper reference line and the surface of the U-CENTER head H. Height of the U-CENTER power take-off max RPM 7 (X +.5).5-1 H A ± U-DRIVE Ø 46 8 H X A Ø 5 ±.5 9 Ø Ø U-CENTER 33

6 R3 U-CENTER Sizes O Ø A 1 5 C Ø B C D I ±.1 ±.1 Ø Ø L L 5 Ø Ø 18 Ø N ± Ø S T 175 ± ± E +.4 prof F H M X P G Q 49 R (75) 4 5 Ø U 34 DATA UC 14 BH UC 16 BH UC 18 BH UC BH ØA mm ØB mm C mm D mm E mm F mm G (da N) H mm I mm L mm M mm n 14 M 5x11 n 18 M 5x11 n 14 M 6x1 n 6 M 6x1 ØN mm O mm P mm Q mm R mm ØS mm T mm ØU mm Xmm DATA 1. Maximum overall dimensions of balancing weights. Measurements for hollows 3. Rotation lock disengage stroke 4. Coolant intake 5. Coolant outlet 6. Centre of gravity

7 Chip removal capacity D ANDREA These parameters are indicative for normal working conditions on steel with a hardness of 16- HB, positive insert and cutting speed of 1 m/min. D mm L U-CENTER 14/BH D U-CENTER 16/BH - 18/BH - /BH L mm U-CENTER 14/BH -16/BH U-CENTER 18/BH - /BH Chip section in mm U-CENTER 14/BH.75.5 U-CENTER 16/BH.85.6 U-CENTER 18/BH U-CENTER /BH 1.75 D mm L U-CENTER 14/BH 35 D U-CENTER 16/BH - 18/BH - /BH L mm U-CENTER 14/BH -16/BH U-CENTER 18/BH - /BH Chip section in mm U-CENTER 14/BH.5 U-CENTER 16/BH.65 U-CENTER 18/BH U-CENTER /BH

8 U-CENTER Supply K REF. K UC 14/BH K UC 16/BH K UC 18/BH K UC /BH CODE K3 consisting of: P 1 P 11 P 11 P 111 T 14 L T 14 R REF. K3 UC 14/BH K3 UC 16/BH K3 UC 18/BH K3 UC /BH CODE ARBORS To order the U-CENTER arbor, it is necessary to draw-up the form on p. 38 REF. UC 14/BH UC 16/BH UC 18/BH UC /BH ISO 45 / 5 ISO 45 / 5 ISO 45 / 5 ISO 45 / 5

9 Toolholders and heads D ANDREA P1 P11 UC 14-16/BH UC 18 - /BH REF. CODE D H P P P P P11 P111 UC 14-16/BH UC 18 - /BH REF. CODE S L P P P P T 14 L D T 14 R T 14L T 14R A D H S L F REF. CODE A D F UC 14-16/BH UC 18 - /BH T 14 L T 14 R T 14 L T 14 R CCMT CCMT

10 Technical data D ANDREA G P 11 I K H F E Ø L Ø C Ø D Ø B Ø A P 111 P 1 P 11 TECHNICAL DATA UC 14 BH UC 16 BH UC 18 BH UC BH H mm inch K mm inch I mm inch L mm inch Tool slide trasverse mm inch Feed mm/min. inch/min Rapid motion mm/min. inch/min Maximum speed RPM RPM Torque Nm lb ft Max. torque on take-off shaft Nm lb ft Radial force dan pound Unidirec. repeatability accuracy RP mm inch Weight with shank Kg pound Ø A mm inch Ø B mm inch Ø C mm inch Ø D mm inch E mm inch F mm inch G mm inch Boring accuracy H7 H7 H7 H7 H7 H7 H7 H7 Facing accuracy on tot. slide stroke mm inch Max. chip removal on C4 steel Facing mm inch Boring mm inch Roughness Ra μin