Numerical Control Reconstruction of Deep-neck Press

A11-20A deep neck presses are mainly composed of fuselage, clutches, sliders, brakes and manipulators. It is a crank connecting rod as the working mechanism, the action principle see. The crank link mechanism is rigid, so the movement of the slider is mandatory. The number of strokes per minute and the movement curve of the slider are constant. The press belongs to the general press of sheet metal stamping. It is suitable for all kinds of cold stamping processes, such as cutting, punching, blanking, bending and wire stretching, etc., which is suitable for automobile, , Instrumentation and other industries of large sheet metal parts punching, blanking, drawing and other stamping line work.
In the actual production, it exists the following aspects: ① manual poor precision “operation workers labor-intensive, prone to disability accidents, security is not effective protection does not meet the small quantities of different varieties of processing, The flexibility of the product is poor; ④ defective rate is high, the production efficiency is low, thus affecting the development of productivity, the use of advanced numerical control device has become the general trend of deep-neck press processing technology to improve the deep neck press NC rate Two ways: First, the purchase of new CNC deep-neck press, the second is the ordinary deep-necked press into the NC deep-neck press. According to China’s current economic situation, spend a lot of money to replace the new NC Deep-neck press is not possible, while the original common type of deep-neck press is a great waste, and general-type presses CNC transformation is both economical and efficient, is in line with China’s national conditions, is to improve The number of deep-neck presses) to achieve step) according to the type of zero-sequence voltage on the current sampling points to analyze and calculate the magnitude of zero sequence voltage !.) Judge! Whether to meet>! 2x15V, as a ground fault occurs If this condition is not satisfied, proceed to step 1) .If this condition is satisfied, the zero sequence current sampling and analysis of each outgoing line will be started.) Using the formula, the zero sequence active power of each outgoing line is the outlet line number ).) For each line zero sequence active power is compared, then the maximum is the single-phase ground line.
4 Conclusion By analyzing the compensation system when the single-phase ground current characteristics of zero sequence current, based on zero-sequence current active line selection principle, its essence is to find the largest zero sequence active power algebraic value of the amount of active power. It also analyzes the advantages of the recursive DFT algorithm and the algorithm steps to realize the principle of the line selection. This algorithm only uses the real and imaginary parts of the signal, and avoids any calculation of the phase relation. The computation is small, the operation speed is fast and the real-time performance is good. So it is a compensation system single-phase ground fault a more effective method.
Hu Tianlu. Leakage protection of mine power network Beijing Media Carbon Industry Press, Tang Yi. Selective leakage protection. Beijing: Coal Industry Press, 1995 Fan Shunyao (1968 -), male, engineer. Now China University of Mining and Technology School of letters and telecommunications graduate students.
; Editor: Hu Chang Chi) control the rate of effective ways. In view of this, specifically on the Jiangsu Yangzhou Star Machinery Manufacturing Co. production of A11-20A-type deep-neck presses for economic numerical control transformation.
2 deep neck press NC transformation as shown, deep neck presses are: OP NC unit control panel, MCP machine panel, ENC NC unit, DI / 0 input and output modules, X-axis and Y-axis stepper motor and Drive, X-axis and Y-axis three-phase hybrid stepping motor, the main motor for the three-phase 380V), electromagnet clutch YA (model MQ1-5131, 380V / 50HZ) and some X, Y axis Bit switches, emergency stop switch and safety photoelectric switch and other components.
2 NC presses machine panel; 3-ENC numerical control unit; 4-DI / 0 input and output module; 5-machine electrical control box; 6-main control panel; X-axis and Y-axis stepper motor drive; 10-X-axis and Y-axis stepper motor works according to the processing needs of the machine is based on the needs of the machine; 7-YA electromagnetic clutch; 8-emergency stop switch, limit switch, photoelectric safety device; Write the processing program, input to the control unit ENC through the operation panel, or program and simulate the operation on the computer, and communicate with the CNC unit ENC through the intelligent communication interface to transfer the instruction or data to the NC unit. CNC system according to the requirements of the program, after information processing, distribution, sub-to control the main motor M and electromagnetic clutch YA, X-axis Y-axis control to move a number of minimum displacement to achieve the press and the workpiece relative movement, Product processing. ) The main motor control principle As shown, the main motor control is divided into manual control and automatic control. ) Manual control manual control is generally used to repair debugging or a single component processing, close the knife switch “G, then switch to manual position, the key switch SA1 closed, press the start button SB2, KM1 suction and self- When the main motor M starts to rotate, press the manual button SB3 or the foot switch SF, the intermediate relay KA pulls in, the electromagnetic clutch YA turns on the AC380V power supply, and the presser slips down to start the machining of the parts. SB1 is the stop button.
Normal processing, the switch SW1 placed in the automatic state, when the start processing, CNC unit ENC issued a command, a pull-in, contactor KM1 connected to power, the main contact closure, the main motor began to rotate. Need to stamping when the king 3 – issued a directive, the middle relay 3 pull, followed by KA suction, electromagnetic clutch YA connected to power, briquette action, the beginning of the processing parts. The NC issues an instruction when a stop is required. 0,2 pull, disconnect KM1 and KA, the main motor M and electromagnetic clutch YA at the same time power. 0,1,2,3 intermediate relay points through the NC programming control, they are connected in parallel with the freewheeling diode to prevent the relay power-off instant high voltage reverse burn out the ENC NC unit.
(3) hybrid stepper motor feed system) deep neck press part of the transformation is to remove the original transmission of the mechanical transmission mechanism, with a stepper motor drive gear by the gear drive to drive the workpiece longitudinal and lateral movement. As shown, the longitudinal feed X-axis drive, stepper motor 3 solid walk on the chassis, through the gearbox 2 drive screw drive longitudinal movement of the workpiece. Y-axis drive, or horizontal feed, is driven by the stepper motor 1 directly to drive the lateral movement of the workpiece. Longitudinal feed with slowdown mechanism, can achieve the required pulse equivalent, but also to meet the structural requirements and increase the torque.
3-X-axis stepper motor; 4-bed; 5-table) selected by the German company BERGERA BERGERHHR three-phase hybrid-type step-by-step production of three-phase hybrid stepper motor; Motor and its drive, AC servo principle will be applied to the stepper motor system. The stepper motor draws the advantages of two-phase and five-phase motor, and its supporting drive using the AC servo motor drive work, this motor system completely solve the traditional stepper motor low speed crawling, a resonant area, large and high speed Torque and other shortcomings, it is called with the AC servo motor operating characteristics of the stepper motor system.
Refer to the stepper motor drive control schematic diagram, AC380V power supply through the isolation and step-down transformer TB into AC220V stepper motor driver as the supply voltage connected to the L, N-side, the numerical control unit CP +, CCW + output pulse sub-control drive WD3- 007 output pulse and the output direction, U, V, W connected to the angular connection of the stepper motor winding. Drives and stepper motor PE-side requirements for reliable grounding.
6, stepping motor winding wiring and current waveforms imprisoned and shown, Bingley will AC servo motor drive principle applied to the stepper motor driver, the input AC220V DC325V generated by the rectified pulse width modulation into 325V Sinusoidal current waveform, each step corresponds to the motor rotation step, by changing the drive output current frequency to change the motor speed, and the number of steps to go out of the motor rotation angle. As shown in the current through the winding of each phase is a stepped sinusoidal current, the use of a sinusoidal stepped current drive, making the motor each step corresponds to the current change is very small, it will not produce low speed crawling, resonance, sound and other undesirable phenomena, Operating characteristics almost the same as AC servo motor. Only three power lines are used between the motor and the drive, and as little as possible with AC asynchronous motors. Driver circuit board to take a three anti-treatment, overheating, overvoltage, undervoltage, motor phase short circuit and overcurrent protection. The drive has a semi-flow function, when the stepper motor, please subscribe to the 2002 mine mechanical and electrical magazine bookmark1 = self-issued, order letter that is sent. Address: Shanghai Tianyaoqiao Road on the 1st, 200030, telephone (021 static 100, the drive output current automatically reduced to the amount of the output current of 60, used to prevent motor heat.
In short three-phase hybrid stepping motor drive system in the production of practical applications, fully demonstrated the go-bit high precision, fast response, large torque, motor heating small, no resonance zone and a series of advantages.
(4) emergency stop limit and other protective devices prison (emergency stop limit and other safety devices ENC-NC unit; SB6-emergency stop button; SB5-start button; SB4-over-range release button; S01, S02, S03, S04 -X-axis Y-axis positive and negative limit switch; ZCZ-briquette work detection switch 1) CNC system with soft and hard limit protection. The soft limit alarm is set by setting the maximum and minimum coordinate values ​​of the machine axes in the machine coordinate system. This area is called the working area rinse limit set inside the hard limit. The stroke limit of the hard limit protection is determined by the stroke switch. Once the stroke switch is depressed, the feed drive power is cut off immediately and the CNC is notified to generate an overtravel alarm. ) If abnormality occurs during the process, press the emergency stop button SB6 will immediately cut off all drive power to achieve emergency stop, troubleshooting, you must manually lift the emergency stop before they can continue to work. ) ZCXZCY deep neck press for the working point ZCZ for the pressure detection device, through the programming and the use of electromagnetic clutch YA complex graphics processing.
3 Conclusion CNC transformation of the deep-neck press, the main advantages are: the system is flexible and reliable. With the input information storage capacity, you can use the common processing program one-time input memory, call at any time, the NC unit as a control unit hardware less hardware components to reduce the failure rate, thereby improving reliability.
System software control, easy to expand, adaptability. As long as the process can change the processing of different parts, can be complex pattern processing.
With self-diagnostic capabilities, easy maintenance. The system has a diagnostic program, you can easily identify the type of failure and parts of less downtime.
Program editing convenience. You can add, delete and modify the debugger in the field, but also on the computer programming simulation run, communicated to the CNC unit.
Can be fully automated processing. Only need to clamp the processing plate in the processing process, press the start button on the machine, and the remaining processing can be fully automated processing, greatly reducing the labor intensity of workers by the field workers welcome.
Can achieve security protection. In the processing process if someone strayed into the processing area, the CNC system can automatically cut off the power, to achieve security, to ensure the safety of production.
Saving money. And the purchase of new NC deep-neck press compared to save a lot of money.
Control principle is more complex, requiring maintenance personnel knowledge of wide, hands-on ability to be strong.
Requires highly skilled and trained programmers and operators.

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