Punch manufacturers is how to exclude stamping work in continuous action

 Introduction to the Press Manufacturer for the Continuous Movement of the Pressing Elimination Method. Punch punch punch manufacturers use punching, due to improper operation of the operator or other causes of the process of red all kinds of fault problems, if these failures are not ruled out as soon as possible will lead to a series of unavoidable failures, Thus affecting the normal production of the news, like the treading of continuous movement is a common failure, at work, we look at the IPM mechanical power of continuous movement below the printing press manufacturer is how to eliminate punching failure.

According to IPM Machine Tool Manufacturing Co., Ltd. Technical Engineer Analysis: If there is continuous movement in the stamping process, the punch press manufacturer should first clear the state of the jog, then check the point to find the root cause of this problem.

According to the manufacturer should check the perforated brake parts, punch and see this part of the wear part is too serious, has exceeded the scope of safe production, under normal circumstances, most of the punch brake clearance of 0.5? 1.5 range Mm. If the result is beyond the scope of failure should be likely in this place, and on-site replacement of brake parts.

If this is not the case, then you should consider whether the second fall to protect the short phenomenon, which is a common cause of continuous punch movement.

What causes the punch press load noise

 punch press staff will touch the stamping load noise big obstruction, the punch let to you to deal with this problem.

The causes of the load operation noise are the tool and workpiece or stripper plate and the collision between the blank, stamping process of twisting and punching. Which stamping process of the biggest impact of the twist and punching noise.
1, punching shear noise: stamping process differences in the process, a great noise to leave. Sheet metal blanking than complex, deep drawing noise, and imprinting, pressure wave, flanging, bending, drawing and other forming process noise is small.

2, twisting noise: the same type of punching noise and stamping parts of the punching plate thickness, hardness, geometry, hammering speed, die spacing and other off because of the whole, noise increases with the increase of these values. Punch at work, the punch and the plate and the stripper plate and the collision of the billet greatly enhanced, with the impact of the speed of the crash also will be raised, the collision noise and subsequent punch manufacturers broke the sound of the material can be measured separately, This measure has been carried out. In a unified punch, punching thick, hard material than the cut-thin, soft material noise. In the case of a thick, ductile sheet, the impact noise and rupture sound are of a normal size.

Three Kinds of Common Maintenance Methods of Three Dimensional Numerical Control Drilling Machine

3-D CNC drilling machine in the use of transport process, will produce some parts of the wear, corrosion, burning, deformation, etc., affecting the accuracy of the equipment, performance and production efficiency, so the regular maintenance of three-dimensional CNC drilling machine becomes particularly important The maintenance of the three – dimensional NC drilling machine can effectively restore the accuracy and performance of the equipment, preserve the quality of the processed products and play the equipment should be effective.
1, preventive maintenance: in order to prevent the three-dimensional numerical control drilling machine performance degradation or reduce the probability of three-dimensional CNC drilling machine failure, according to predetermined program and technical conditions for the maintenance activities.It is from the prevention of “medical” position, according to regular equipment inspection Record or run with the quality of the main products, production efficiency, there are abnormal signs of failure in the three-dimensional CNC drilling machine before the failure to carry out preventive repair to improve the program preventive maintenance of equipment, prevention of the day, by mastering the three- CNC drilling machine wear rules, there are plans to carry out periodic maintenance overhaul, is to maintain the normal operation of three-dimensional CNC drilling machine, play an important guarantee for its function.
Planned preventive maintenance is an important part of equipment management, production, technology, financial planning is an integral part of the correct and realistic pre-repair program, can be unified arrangements for human and material resources to do the preparatory work for the early, shorten Equipment downtime, reduce repair costs, both on-time maintenance equipment, but also a planned rhythm to arrange production, so that production and maintenance of the two errors.
2, fault maintenance: three-dimensional numerical control drilling machine failure or performance reductions taken by non-planned maintenance, also known as after-maintenance, this maintenance is the fault after the occurrence of the remedy.
3, production and maintenance: starting from the economic efficiency of three-dimensional numerical control drilling machine production efficiency of the maintenance method, which according to the degree of impact on the production of equipment to deal with, if you can master the maintenance mode, then it will improve their production efficiency, unimportant equipment Using after-maintenance, the key equipment for preventive maintenance.
In addition to the above several maintenance methods, there are improved maintenance, regular maintenance and no maintenance design, etc., are more practical three-dimensional CNC drilling machine maintenance, friends as a reference to help you better use of three-dimensional CNC drilling machine.

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.

Renovation of Ordinary Lathe by Numerical Control

1 Overview CNC transformation generally refers to some parts of the general machine tool to do some transformation, coupled with the numerical control device, so that the machine has the ability of CNC machining. China’s existing ordinary machine 3 million or so of these equipment CNC transformation has become an important national technical policy in production in the implementation. Using MCS-51 series 8031 ​​single-chip microcomputer, CNC machine tool C620 lathe is reformed numerically. The micro-computer is used to open and control the longitudinal and transverse feeding system. The stepping motor is used as the driving element and the ball screw is used in the drive system. The system block diagram such as.
2 machine repair before the repair and treatment As a result of computer transformation of the machine can only improve the quality of parts processing consistency, precision machining parts by the precision of the machine itself and the stepper motor step precision to ensure accuracy. So the machine must be modified before the machine repair.
(1 on the actual service age of 5 years in the following machine tools, parts of the parts are still in good accuracy has not decreased, the rail scratches in the basic visible state, can not be overhauled on this type of machine can have both computer control and manual operation In order to ensure that individual parts of small batch processing, in the absence of the need for CNC cutting, can still be used manual operation, give full play to the potential of machine tools to improve machine utilization.
(5: 10 years of service in the basic parts of the machine is still good, just some of the parts for repair and replacement, and in accordance with the standard overhaul of the lathe can be qualified to check the transformation.
3 conversion process 3.1 transformation of the lathe transmission system for the general lathe main drive system and feed system are from the spindle motor, and the transformation of the CNC lathe, the main drive system and the feed system separated into two unrelated systems .
Three-phase motor – Pulley – Spindle gearbox – Spindle (feed system vertical and horizontal respectively to!) Said the transmission path plate box tool post) transformation of the incentive control of the lathe transmission schematic see.
3.2 stepper motor and ball screw connection Stepper motor and ball screw connection is an important problem in the conversion machine, requiring reliable connections.
In order to facilitate programming, to ensure processing accuracy, the general requirements of vertical lathe! To the pulse equivalent to 0.01mm lateral “to) pulse equivalent to 0.05mm so that the diameter value of 0.01mm. As the rotary workpiece drawing size are expressed in diameter values, so the horizontal” experience exchange “machine I work I The pulse equivalent of 0 is not only intuitive, but also can improve the repeat positioning accuracy.
The stepper motor and the ball screw connection is not necessarily just 11 relationship, this time, you must use the two gears, “1,” 2 “stepper motor pulse angle equivalent” and the ball screw pitch! The gear ratio of “1” and “2” is: Number of teeth A-Feed screw Basic lead, one pulse equivalent!
= 0.75mm, = 0.01mm, then) = 5/3 = screw gear teeth / stepper motor gear teeth) = 25/3 = the ball screw pitch = 8mm, using 110BF stepper motor step angle = 12 = screw gear teeth / stepper motor gear teeth To achieve the transmission ratio to ensure that pulse equivalent, CNC lathe ball screw and stepper motor connections are used gear connection type.For example, the transformation of the C620 110BF003 type stepper motor , Then other lathes can be modified according to the above formula, according to the structure size to determine the design parameters of the gear.
3.3 stepper motor and machine tool connection using the form of transmission-type connection. The stepper motor shaft and the screw shaft with a box connection, the center of the hole can be more accurate to ensure that the meshing gears, smooth transmission of low noise and easy to dust. Suitable for precision lathe modification to maintain good.
3.4 Measures to eliminate the gear gap Since the stepper motor and the ball screw between the use of a pair of gear drive, the introduction of the transmission gap, stepper motor rotation step angle can not make a synchronous rotation of the ball screw a corresponding angle, thus Reduce machining accuracy. Such as the transmission gap can not be compensated for the accumulation of parts processing error is growing, resulting in dead and return error.
Eliminate the gear gap measures, on the one hand the use of computer software to modify the other hand, the use of non-slotted gear drive.
The system uses two-tooth wrong tooth-shaped anti-gap structure) 2, the same number of teeth of the two films at the same time with another wide gear meshing between two lamellar gears rely on spring force to open a certain angle, so that the two gears left and right gear tooth contact The right and left flanks of the wide gear eliminate backlash. See the structure.
3.5 hardware circuit the overall program After the transformation of CNC lathe control system hardware circuit synopsis by the following four parts: the main controller, memory, bus and interface. The reliability of the hardware circuit directly affects the performance index of the numerical control system, in which the CPU is the heart of the numerical control system. See the hardware block diagram.
As the 9 /: – 51 series CNC machine tools in China in the application of its more common inexpensive chip, the performance of the United States to meet the requirements of economic CNC machine tools, so the 8031 ​​as the central processing unit CNC system.
6) memory expansion As the master CPU 8031,031 MCU only 128 bytes of RAM, no ROM, and CNC machine tools need to program memory and data memory capacity are larger external memory (EPRO9 Xiang data Memory RAM) chips. So choose a piece of 2764 as a program memory, a piece of 6264 as data storage. In order to 8031P0 interface address information separated out to provide external memory with low 8-bit address information The system also uses 74L373 as the address latch. As the main chip connection diagram.
System expansion, the completion of the keyboard / monitor input and output.
NC device sent a series of continuous pulse must be distributed through the ring, according to a certain order assigned to the phase of the stepper motor winding, the winding in accordance with the pre-specified control power or power. The system design uses YB013 ring distributor. At the same time stepping motor drive circuit should also consider the power amplifier circuit, optical isolation circuit.
3.6 software design The SCM numerical control system software using modular design method, which is the main block package, subroutine module and interrupt handling module. Main module functions: 155I / O initialization, single-chip T0, T1 timer / counter initialization, the keyboard data area, display buffer initialization software logo initialization and so on. The main module of the monitoring is to determine whether there is a function key to press if there is, then turn the corresponding function subroutine module.
The subprogram module is designed according to the function keys.
In the interrupt processing, three modules are included in the system. According to the priorities of the different events in the computer numerical control system, they are: emergency repair processing and limit switch; the real-time modification of the display buffer data module is shown in Fig. Scan management module.
3.7 mechanical and electrical installation after the test machine e off power amplifier experimental setup procedures. E) manual operation of the stepper motor must be consistent with the direction of the provisions of the direction of the motor should be replaced; e into the processing procedures for no-load operation; e) E) processing of a group of parts to check the accuracy of repeated processing, if the dispersion of the size distribution of parts to be a specific analysis of the reasons for the error of the reasons for the error of the size of the part of the processing; And then make improvements until the desired purpose is achieved.
4 with the development of microelectronics technology in China’s machine tool NC in the last decade has been great development, and the transformation of ordinary CNC machine tools to meet the same processing tasks in the premise, can greatly reduce the technological transformation Of the investment funds, in practice has been widely used.

NC transformation of ordinary lathes

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