Shallow talk about the PowerFlex4 application in numerical control machine tool

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  • source:FINKEL CNC Machining
One, machine tool of brief introduction numerical control, abbreviation NC (Numerical Control) machine tool, it was to use a kind of when pass feeling technology, nicety to measure with the advanced technique such as machine tool design development to rise computer technology, automata, new-style machine tool integratedly, it is the Electromechanical unifinication product that the market mechanism, multinomial technology such as electric, hydraulic pressure, pneumatic, microelectronics is an organic whole, it is mechanical high accuracy, efficient, tall automation and Gao Rou sex are had to change the machine tools that waits for an advantage in production equipment. Numerical control machine tool is common by machine, report two parts are formed, among them electric electron part basically is by numerical control system (CNC) , feed servo drive and composition of system of drive of main shaft feed. Main shaft is a machine tool an important part in forming, machine efficiency to rising, enlarge machines material limits greatly, promotion machines quality to having very main effect. Great majority of traditional general accuracy machine tool is cannot of automatic gearshift, when needing speed change, can stop the machine tool only, next the hand uses speed change. And of numerical control machine tool advocate transmission system uses infinitely variable speeds mostly. Current, system of infinitely variable speeds basically has system of frequency conversion main shaft and system of servo main shaft two kinds, use dc or electric machinery of communication main shaft commonly. Rotate through taking transmission to drive main shaft, or through bringing the decelerate gear inside transmission and main shaft box (in order to obtain bigger torsion) drive main shaft to rotate. Because range of timing of main shaft electric machinery is wide, but stepless speed regulation, make the structure of winner axle box simplifies greatly. Compare as a result of the tall sex price of transducer at present, so transducer is changed in the numerical control of machine tool of economy numerical control and general accuracy machine tool in transforming, use very general. 2, the transducer of PowerFlex 4 communication of brand of product characteristic Allen-Bradley is in its are compact, the electromotor speed with powerful function was being offerred to control it for the user in the design of economic space is the dimension in PowerFlex transducer series the smallest, most a member with active economy. The rated power that this transducer can provide and voltage grade are respectively 0.

2-3.

7 KW(0.

25-5 Hp) and 120V, 240V, 480V, use convenient requirement to satisfy complete OEM and final user to be mixed to flexibility, economic space and it is designed. If the main shaft drive of machine tool industry applies a circumstance to have the choice with speed pilot efficient economy,PowerFlex 4 is mechanical tool. 1. Belong to compact confuse you model product, volume is minor, 0 clearance, save installation time and space. 2. Installation is convenient, defend neatly crust and installation option, can get stuck directly outfit at DIN slideway. 3. Without sensor vector control function accords with the demand of all sorts of type application circumstances, satisfy the requirement of machine tool main shaft on low speed torsion especially, torsion starts to be able to achieve 150% above when 5HZ. 4. The function is all ready, easily set is started, the control that operates face plate bolts and the potentiometer on face plate simplified to start a process, the position indicator above the key that start and speed potentiometer can indicate its position. 5. Compositive face plate reachs communication port, have inside the RS485 of buy corresponds (DSI, transducer serial communication agreement) . 6. Crackajack outstanding starting torsion and acceleration can, voltaic precision and digital input answer time, to torsion change is answered quickly, high speed mode but will answer time to rise to 10mSec. 7. Provide muti_function output terminal signal, if speed arrives at signal, breakdown directive, contented system the monitoring to position of main shaft career. 8.

Drive Explorer and Drive Executive software offerred a kind to be mixed simply intuitionistic method with process designing, monitoring and control.

9. Carrier wave frequency can come most 16KHZ, the fan when only transducer moves just moves, the electromagnetism noise that reduces electric machinery achieves Jing Yin to move. 10. Overload capability is strong, electric current of 150% rated output exceeds a minute, electric current of 200% rated output exceeds 3 seconds. 3, the structure of main shaft drive that uses machine tool of effect numerical control uses alternating current machine and servo electric machinery commonly, use transducer or be safeguarded in order to eliminate dc machine brush and high speed limitation, conduct campaign to main shaft through taking drive, make main shaft achieves certain rotate speed to implement stepless speed regulation then, the rate that uses transducer at the same time is consistent signal (SU) after affirm electromotor achieved instruction rate, reentry knife cutting is machined, improved efficiency and treatment quality thereby. 1. Because had higher main shaft rate, what can come true to wait for flexible work to aluminous, copper is efficient the finish machining of cutting and high accuracy 2. Because do not need to maintain brush and clutch, more agile to the choice of main shaft electromotor and installation. 3. Because used whole sealing electric machinery, environmental suitability is better. 4. Can achieve constant string fast cutting, make according to the position of cutting tool main shaft speed changes continuously, raise turning dish the exterior quality of kind of spare parts. 5. Realize power of high rate constant easily to run, improve cutting function and treatment quality. But need to note a few problems when application is designed, because rate is adjustable full range is very big, need to notice consideration and mechanical component when doing general accuracy machine tool to transform be equal to set, in order to prevent machinery resonance and in the low frequency vibration that needs enough big torsion. Because vector controls need to offer electric machinery parameter (impedance) , transducer offers electric machinery parameter to rectify calm function oneself, run key through face plate, transducer can move automatically. In running a course automatically, give electric machinery parameter besides computation beyond, still can detect clean carries electricity, it these a few parameter can show higher performance to vector control is very important that these a few parameters can show higher performance to vector control, this process can last ten seconds time. Carrying out before rectifying calm function oneself, must affirm whether electric machinery side does not have any join, include decelerate leather belt. 4, equipment of machine tool of contemporary metal cutting cannot leave the last word the communication timing control such as main shaft, include the of all kinds general accuracy machine tool such as lathe, milling machine, grinder, planer and numerical control machine tool, because machine material to differ character, need different rotate speed, the opportunity that uses frequency control accordingly is very much, but choose general VF to control or result of dimensional vector pilot is bad, this is the main reason that is not worth because of low speed torsion. General transducer wants successful use must have two serious considerations in machine tool industry: It is to choose without product of pilot of speed sensor vector, 2 it is to want a design to run in overspeed in order to raise low speed torsion. CNC Milling