CN110632894A - Intelligent vertex correction method for electronic cam controller - Google Patents
Intelligent vertex correction method for electronic cam controller Download PDFInfo
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- CN110632894A CN110632894A CN201810662873.7A CN201810662873A CN110632894A CN 110632894 A CN110632894 A CN 110632894A CN 201810662873 A CN201810662873 A CN 201810662873A CN 110632894 A CN110632894 A CN 110632894A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/404—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by control arrangements for compensation, e.g. for backlash, overshoot, tool offset, tool wear, temperature, machine construction errors, load, inertia
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/45—Nc applications
- G05B2219/45136—Turning, lathe
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/45—Nc applications
- G05B2219/45137—Punch, stamp, also with use die, mould
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Abstract
The invention discloses an intelligent vertex correction method of an electronic cam controller, wherein the electronic cam controller comprises a 32-bit RAM single chip microcomputer, a magnetic encoder, a nixie tube display, a marquee unit, a power supply, a storage unit and an electronic cam input and output interface, the single chip microcomputer is connected with the nixie tube display, the marquee unit and the storage unit, the single chip microcomputer is connected with the electronic cam input and output interface through an optical coupler, the magnetic encoder is arranged on an external machine tool and used for detecting the running angle of the machine tool, the magnetic encoder is connected with the single chip microcomputer through an SPI serial interface, the nixie tube displays the cam angle and speed, a marquee module comprises 36 marquees, and the marquee is displayed according to the cam angle value. The intelligent vertex correction method of the electronic cam controller can make the vertex correction more intelligent, and particularly can still stop at the top dead center when the speed of a machine tool changes greatly, so that the yield of products is improved.
Description
Technical Field
The invention relates to the technical field of mechanical punch control, in particular to an intelligent vertex correction method for an electronic cam controller.
Background
The punching machine is a common machine device in industrial production, and the electronic cam controller is a common device of the punching machine. The electronic cam controller has functions of counting, cutting and the like in addition to the switch angle of the cam. A further important function is the function of top dead centre parking. The so-called top dead center stop function is to stop the flywheel at the top dead center automatically. Because the brake has a sliding distance, the brake needs to be performed a certain distance in advance. The sliding distance is changed, so an intelligent braking distance correction algorithm is needed. Common electronic cams on the market, such as big flags, Estan and the like also have the function of automatic correction, and this time running speed is the same with last time or differs by a little, and the correction effect is better, but if this time running speed differs greatly with last time, the effect of correcting will be poor a lot, and when leading to next punching press, the pressure is uncertain, and the rejection rate rises, has reduced the efficiency of production, has increased manufacturing cost. Sometimes even stopping at the bottom dead center, directly resulting in the die jamming, which causes considerable trouble in the machine tool running again.
Disclosure of Invention
The purpose of the invention is as follows: in order to better stop the punching machine tool at the top dead center, the invention provides an intelligent vertex correction method of an electronic cam controller, which can stop the punching machine tool at the top dead center when the running speed of the punching machine tool at this time is greatly different last time. Thereby improving the yield of the product.
The technical scheme is as follows: an intelligent vertex correction method of an electronic cam controller comprises a 32-bit RAM single chip microcomputer, a magnetic encoder, a nixie tube display, a horse race lamp unit, a power supply, a storage unit and an electronic cam input-output interface, wherein the single chip microcomputer is connected with the nixie tube display, the horse race lamp unit and the storage unit, the single chip microcomputer is connected with the electronic cam input-output interface through an optical coupler, the magnetic encoder is arranged on an external machine tool and used for detecting the running angle of the machine tool, the magnetic encoder is connected with the single chip microcomputer through an SPI serial interface, a 24V power supply is converted into 5V direct current through a DC/DC conversion chip TD1501 to be supplied to the magnetic encoder, the output 5V direct current is converted into 3.3V direct current through a chip AMS1117 to be supplied to the single chip microcomputer for use, the nixie tube displays the cam angle and speed, the horse race lamp module comprises 36 horse race lamps, the cam angle is 360 degrees, 36 tickers are corresponded, one light is ON every 10 degrees, IN-2 is a parking button input signal, IN-3 is a machine tool motor power supply input signal, OUT-2 is an electronic cam output stop signal, IN a single-action mode, an external key changes an IN-2 signal from an ON state to an OFF state, when the work is started, namely T1 time, the IN-3 signal is changed from an OFF state to an ON state, at the moment, a controller calculates a correction angle theta, the correction angle time is completed, namely T2 time, a single chip microcomputer sends a command to control an OUT-2 signal to be changed into an OFF signal, the single chip microcomputer receives the IN-3 signal, at the T3 time, the IN-3 signal is controlled to be changed from the ON state to the OFF state, and when the IN-3 signal is detectedAfter the signal is turned OFF, the single chip microcomputer sends an instruction to control an OUT-2 signal, and the OUT-2 signal is turned ON at the time of T4; IN the linkage mode, the external key changes an IN-2 signal from an OFF state to an ON state, changes an IN-3 signal from an OFF state to an ON state at the time of T5, changes the IN-2 signal from an ON state to an OFF state at the time of T6, calculates a correction angle theta, finishes the correction angle time, namely the time of T7, the singlechip sends a command to control an OUT-2 signal, the OUT-2 signal changes from an ON state to an OFF state, the singlechip receives the IN-3 signal, controls the IN-3 signal to change from the ON state to the OFF state at the time of T8, and sends a command to control the OUT-2 signal after detecting that the IN-3 signal changes to the OFF state, and the OUT-2 signal changes to the ON state at the time of T9; calculating the correction angle theta according to a formula2A/2 a, the time T from the signal OUT-2 to the signal IN-3 sent by the electronic cam controller to turn OFF, namely T3-T2 during single action, T8-T7 during linkage, theta represents the sliding angle of a machine tool flywheel, namely a correction angle, omega represents the speed of the movement of the machine tool before braking, omega is calculated by collecting the angle difference collected by the magnetic encoder and the collected time difference, a represents the acceleration during braking, the delay time T can be calculated according to the signal collection time, therefore, the acceleration a becomes a unique variable, the value of a can be directly calculated, a is related to the characteristics of the machine tool, the electric reaction delay time T is small IN change or almost unchanged and is regarded as a constant, omega can be directly calculated according to the position signal fed back by the magnetic encoder when the machine tool starts to work, a is calculated through the action of the machine tool last time, therefore, the next sliding distance is estimated according to a formula, and the braking point can be calculated by taking the sliding angle as a correction angle, so that the top dead center can be stopped.
Further, the optocoupler model employs CMOS 04010.
Has the advantages that:
the intelligent vertex correction method of the electronic cam controller can make the vertex correction more intelligent, and particularly can still stop at the top dead center when the speed of a machine tool changes greatly, so that the yield of products is improved.
Drawings
FIG. 1 is a hardware block diagram of an electronic cam;
FIG. 2(a) is a timing chart of parking in the vertex single action mode, and FIG. 2(b) is a timing chart of parking in the vertex interlocking mode;
FIG. 3 is a flowchart of a procedure of the vertex correction method.
Detailed Description
The invention is further explained below with reference to the drawings.
Fig. 1 is a hardware structure diagram of an electronic cam, wherein the single chip microcomputer adopts SMT32F103R8T6 of ST company, which is a 32-bit ARM single chip microcomputer, and not only has fast operation speed, powerful integration function and low price, but also an optical coupler CMOS04010 is arranged between the single chip microcomputer and an input-output interface of the electronic cam. The magnetic encoder is connected with the single chip microcomputer through the SPI serial interface, and the magnetic encoder can collect angle signals of the machine tool and feed the angle signals back to the single chip microcomputer. The input of the power supply is 24V direct current, the direct current is converted into 5V direct current through the chip TD1501 to be output to the magnetic encoder to supply power, and the direct current is converted into 3.3V direct current through the chip AMS1117 to be supplied to the single chip microcomputer to be used. The nixie tube display unit is dynamic display and is used for displaying the cam angular speed and the frequency of 100 Hz. The marquee module comprises 36 marquee, the marquee is divided into 4 dot matrix by 9 dot matrix, 4 anodes are connected with the pins of the second ARM single chip microcomputer through current-limiting resistors, 9 cathodes are connected with the output end of the driving chip 74LS145, the marquee is displayed according to the cam angle value, the cam angle is 360 degrees, the marquee corresponds to 36 marquee, one lamp corresponding to every 10 degrees is on, and the frequency is 1000 Hz.
FIG. 2(a) is a timing chart of parking IN the zenith single action mode, IN-2 is a parking button input signal, IN-3 is a machine tool motor power input signal, OUT-2 is an electronic cam output stop signal, ON represents ON, and OFF represents OFF. IN the single-action mode, an external key changes an IN-2 signal from an ON state to an OFF state, when the work starts, namely at the time of T1, the IN-3 signal is changed from the OFF state to the ON state, at the time, a controller calculates a correction angle theta, the singlechip sends an instruction to control an OUT-2 signal to change the OUT-2 signal to the OFF state after finishing the correction angle, namely at the time of T2, the singlechip receives the IN-3 signal, controls the IN-3 signal to change from the ON state to the OFF state at the time of T3, and sends the instruction to control the OUT-2 signal after detecting that the IN-3 signal is changed to the OFF state, and the OUT-2 signal is changed to the ON state at the time of T4. IN the linkage mode, as shown IN FIG. 2(b), the external key changes the IN-2 signal from OFF state to ON state, changes the IN-3 signal from OFF state to ON state at the time of T5, changes the IN-2 signal from ON state to OFF state at the time of T6, at this time, the controller calculates the correction angle theta, completes the correction angle time, namely T7, the single chip microcomputer sends OUT a command to control the OUT-2 signal, the OUT-2 signal changes from ON state to OFF state, the single chip microcomputer receives the IN-3 signal, at the time of T8, the single chip microcomputer sends OUT a command to control the OUT-2 signal after detecting that the IN-3 signal changes to OFF state, and the OUT-2 signal changes to ON at the time of T9;
the correction angle is calculated according to the flowchart shown in fig. 3. The sliding distance from the electronic cam controlled braking to the complete stopping of the machine tool is mainly related to the electronic and mechanical reaction delay time, the speed of the machine tool movement and the acceleration during braking. That is, θ ═ ω t + ω2And/2 a, the circular motion can be regarded as uniform or uniformly accelerated.
Where θ represents a slide angle of a flywheel of the machine tool, ω represents a speed of a movement before braking of the machine tool, t represents a time from when the electronic cam controller sends a stop signal to when the IN-3 signal becomes OFF, and a represents an acceleration at the time of braking. Omega is collected by a magnetic encoder, then the current running angular speed is calculated, the speed is a known value, the sliding time t is the delay of an electronic actuating mechanism, mainly the delay time of a relay or an electromagnetic valve, and can be calculated by a feedback IN-3 signal, and the sliding angle theta can also be calculated by a signal fed back by the encoder. Therefore, the acceleration a becomes a unique variable which is related to the characteristics of the machine tool, so that the electronic cam controller can calculate the value of different machine tools, and the electronic cam controller has wide applicability. However, since various errors of the acquired signals and actual working conditions are not in an ideal state, a great deal of verification and experiments are needed, and in long-term practice, the value of a needs to be dynamically corrected, and the value of a is also dynamically changed due to the fact that the brake pad is prone to wear. In addition, a self-learning process is needed when the device is installed on a machine tool, and a multi-time averaging method is adopted to make the calculated result as practical as possible. Now modified, the electronic cam control stops the top dead center even after each speed change.
Fig. 3 is a flowchart of a specific procedure for calculating the correction, which begins to represent that a motor starts a machine tool to start working, the operation speed is collected to calculate the operation speed of the machine tool through a signal fed back by magnetic coding, the stop signal is detected to receive an OFF signal of IN-2, parameters such as the current operation speed, time point, angle point and the like are recorded, the stop signal is sent, the point which should be stopped at this time is calculated according to a formula according to the calculated value of a, the stop signal is sent, and signals such as the current time, speed, angle position and the like are recorded. The calculation of the acceleration a means that the value of a at this time is calculated according to a formula based on the recorded information such as the time, angular position, and speed before the stop at this time after the machine tool is completely stopped, such as a signal fed back from a magnetic encoder. If the difference value of the a value is too large compared with the previous value, the a value is excluded to be close to the real value, if the a value of the current time is in a reasonable range, the a value is weighted and averaged with the value of the a calculated before, so that a new a value is obtained, the electric reaction delay time t is found to be changed little or almost unchanged in long-term practice and can be regarded as a constant, and omega can be directly calculated according to a position signal fed back by a magnetic encoder when the machine tool starts to work, and a is also calculated, so that the next sliding angle can be estimated according to a formula, the sliding distance is required to be used as a correction angle in advance for stopping the top dead center, the braking point can be calculated, and a new cycle is started.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (2)
1. Intelligent vertex correction of electronic cam controllerThe method is characterized in that the electronic cam controller comprises a 32-bit RAM single chip microcomputer, a magnetic encoder, a nixie tube display, a horse race lamp unit, a power supply, a storage unit and an electronic cam input/output interface, the single chip microcomputer is connected with the nixie tube display, the horse race lamp unit and the storage unit, the single chip microcomputer is connected with the electronic cam input/output interface through an optical coupler, the magnetic encoder is arranged on an external machine tool and used for detecting the running angle of the machine tool, the magnetic encoder is connected with the single chip microcomputer through an SPI serial interface, a 24V power supply is converted into 5V direct current through a DC/DC conversion chip TD1501 to be supplied to the magnetic encoder, the output 5V direct current is converted into 3.3V direct current through a chip AMS1117 to be supplied to the single chip microcomputer for use, the nixie tube displays the angle and the speed of a cam, the horse race lamp module comprises 36 horse race lamps, corresponding to 36 marquees, one lamp is on every 10 degrees, IN-2 is a parking button input signal, IN-3 is a machine tool motor power supply input signal, OUT-2 is an electronic cam output stop signal, when IN a single-action mode, the external key changes the IN-2 signal from ON state to OFF state, and when the operation is started, that is, at the time T1, the IN-3 signal is turned from OFF to ON, at this time, the controller calculates the correction angle theta, completes the correction angle time, at the time of T2, the single-chip microcomputer sends OUT command to control OUT-2 signal to turn OFF signal, the single-chip microcomputer receives IN-3 signal, at time T3, the IN-3 signal is controlled to change from the ON state to the OFF state, and after detecting that the IN-3 signal has changed to OFF, the single chip microcomputer sends an instruction to control the OUT-2 signal, and the OUT-2 signal is turned ON at the time of T4; IN the linkage mode, the external key changes an IN-2 signal from an OFF state to an ON state, changes an IN-3 signal from an OFF state to an ON state at the time of T5, changes the IN-2 signal from an ON state to an OFF state at the time of T6, calculates a correction angle theta, finishes the correction angle time, namely the time of T7, the singlechip sends a command to control an OUT-2 signal, the OUT-2 signal changes from an ON state to an OFF state, the singlechip receives the IN-3 signal, controls the IN-3 signal to change from the ON state to the OFF state at the time of T8, and sends a command to control the OUT-2 signal after detecting that the IN-3 signal changes to the OFF state, and the OUT-2 signal changes to the ON state at the time of T9; calculating the correction angle theta according to a formula2/2a, electronic cam controllerThe time T from the signal OUT-2 to the signal IN-3 to be OFF, namely T3-T2 during single action, T8-T7 during linkage, theta represents the sliding angle of a flywheel of the machine tool, namely a correction angle, omega represents the speed of the movement of the machine tool before braking, omega is calculated by collecting the angle difference collected by a magnetic encoder and the collected time difference, a represents the acceleration during braking, the delay time T can be calculated according to the signal collection time, so that the acceleration a becomes a unique variable, the value of a can be directly calculated, a is related to the characteristics of the machine tool, the electric reaction delay time T is small IN change or almost constant and is regarded as a constant, omega can be directly calculated according to a position signal fed back by the magnetic encoder when the machine tool starts to work, a is calculated according to the action constant of the machine tool at the last time, therefore, the next sliding distance is estimated according to a formula, the sliding angle is used as the correction angle, the braking point can be calculated, and the upper dead point can be stopped.
2. The method as claimed in claim 1, wherein the optical coupler is CMOS 04010.
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| CN201810662873.7A CN110632894A (en) | 2018-06-25 | 2018-06-25 | Intelligent vertex correction method for electronic cam controller |
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