CN101623827A - Positioning numerical control device and method used for bending machine tool - Google Patents
Positioning numerical control device and method used for bending machine tool Download PDFInfo
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- CN101623827A CN101623827A CN200910056515A CN200910056515A CN101623827A CN 101623827 A CN101623827 A CN 101623827A CN 200910056515 A CN200910056515 A CN 200910056515A CN 200910056515 A CN200910056515 A CN 200910056515A CN 101623827 A CN101623827 A CN 101623827A
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Abstract
The invention relates to a positioning numerical control device used for a bending machine tool, comprising an alternating current motor (4), a screw rod (5), a rear stop (6), a working platform (7), a proximity switch, namely a calibrated sensor (8), a metal piece (9) and a belt transmission mechanism (10). The positioning numerical control device is characterized in that one end of a main shaft of the positioning numerical control device is connected with a photoelectric encoder (1); and a controller (2) and a driving module (3) are serially connected between the alternating current motor (4) and the photoelectric encoder (1). Compared with similar products, the positioning numerical control device greatly saves the whole manufacturing cost, adopts the calibrated sensor to eliminate accumulative error, and guarantees that the controller also can ensure a certain positioning precision and repetitiveness after used for long time. The positioning numerical control device is not excessively dependent on a movement model, has simple structure and controls the precision to meet practical indexes.
Description
Technical field
The invention belongs to machinery manufacturing technology field, particularly relate to a kind of positioning numerical control device and method that is used for bending machine tool.
Background technology
Utilize position feed back signal to realize that the location is the basic task of numerical control bending lathe fast, accurately.This is that a class is used Digit Control Machine Tool very widely, more common method is to pass through motor speed control device at present, reduce operating rate during near target at the back backgauge, in low cruise, realize accurately location then, the defective of this localization method is the cost height, and the present invention is for the new approach that provides is provided.
Patent publication No. CN1848664 utilizes the operation number of turns of the calculated signals motor that the Hall element of dc brushless motor inside sends and controls its running speed, must measure motor in advance and slide the number of turns, according to this number of turns early cut-off motor power supply, the limitation of this method is can't be applied on the AC asynchronous motor with low cost then.
Patent publication No. CN1694344 utilizes the residual electromotive force of dc motor to carry out the short circuit braking, and its limitation is that braking effect is limited, and does not describe concrete localization method.
Summary of the invention
Technical problem to be solved by this invention provides a kind of dynamic brake method and realizes fast the precisely positioning numerical control device and method that is used for bending machine tool of location.
The technical solution adopted for the present invention to solve the technical problems is: a kind of positioning numerical control device that is used for bending machine tool is provided, comprise ac motor, screw mandrel, back backgauge, workbench, be that calibration sensor, sheet metal and belt gear are formed near switch, one end of the main shaft of described positioning numerical control device links to each other with photoelectric encoder, series controller and driver module between described ac motor and photoelectric encoder.
Between described ac motor and driver module, be associated with transfer relay, just delivering after stream contactor and the counter-rotating A.C. contactor parallel connection in parallel with transfer relay, power transformer is just being delivered the stream contactor and is being linked to each other with controller with the counter-rotating A.C. contactor by travel switch and another group transfer relay identical with above-mentioned annexation of two series connection.
Described driver module is made up of rectification module, dropping resistor, diode, voltage-stabiliser tube, electric capacity, optocoupler, MOSFET, current-limiting resistance and fly-wheel diode, the negative pole of described fly-wheel diode links to each other with rectification module by current-limiting resistance, rectification module joins by dropping resistor, diode and voltage-stabiliser tube parallel with one another and electric capacity and optocoupler, and optocoupler links to each other with MOSFET.
Described controller is equipped with LED demonstration and operation keyboard and suitable I/O interface, the built-in switch power supply by 8 chip microcontroller.
A kind of use is used for the method for the positioning numerical control device of bending machine tool, comprises the following steps:
(1) main shaft photoelectric encoder output signal, current location, speed and the acceleration of back backgauge are discerned in the processing of process controller;
(2) controller sends instruction according to the Place object of setting and makes alternating current generator direction running in accordance with regulations;
(3) after backstop expected to reach desired location, controller sent motor dead electricity signal;
(4) owing to effect of inertia, back backgauge slides continuing, and at this moment, controller is predicted the distance that it will slide, and sent the brake signal of suitable size on this basis according to current speed and the positional information of back backgauge;
(5) when motion object during very near target, controller sends final brake signal, finishes disposable accurate location.
A kind of use according to claim 5 is used for the method for the positioning numerical control device of bending machine tool, it is characterized in that: the sheet metal on the described back backgauge just carries out an automated location when passing through calibration sensor and demarcates.
Inventive principle of the present invention:
(1) the present invention adopts a kind of dynamic brake method of uniqueness to realize fast precisely location.After the motor dead electricity, back backgauge has a coast stage, the present invention is according to its state that slides, send suitable brake signal, this signal acts on motor through the brake force that changes into corresponding size behind the driver module, the back speed of backgauge near the target location time is dropped within certain scope, and then send final brake signal, thereby guarantee that backstop anticipates the rapidity and the accuracy of position according to the target location.The present invention compares and adopts the method for electric machine speed regulation location to save expensive motor speed control device in the past, and adopts common squirrel-cage asynchronism three phase alternating current motor, greatly reduces manufacturing cost.
What (2) the present invention adopted is a kind of controlled DC injection braking mode of uniqueness.When the asynchronous motor stator winding applies DC voltage, stator produces static stationary magnetic field, and rotor rotated is cut this magnetic field and produced braking moment, forces motor rotor to stop quickly.With respect to other modes of braking such as dynamic braking, reversing brakings, the response speed of DC injection braking is fast, and braking moment is big, controls more flexible.Utilize these advantages of DC injection braking just, the present invention has designed the Intelligent Dynamic control method of braking moment, has reached low-cost, quick, pinpoint purpose.
The course of work of the present invention is described below (referring to Fig. 2): an at first given target location, under the enabled instruction effect, back backgauge in time t0～t1 full speed running to the A point; Controller sends cutoff command, the motor dead electricity, in the process of back backgauge art skating, rely on the brake force of dynamically adjusting that the back backgauge is carried out speed governing, to the t2 moment (B point), controller sends a final brake signal stops on the target location motor just, finishes location fast, accurately.This moment is not if apply braking action, and back backgauge stops art skating to the t3 moment (C point).
Beneficial effect
The present invention does not need motor speed control device, do not need reducing motor, also do not need gearbox, only need common threephase asynchronous and driver module just can finish the speed adjustment of back shelves material and accurately locate, totally manufacturing cost is saved greatly than like product.
Adopt calibration sensor to eliminate accumulated error, guaranteed that controller still can guarantee certain positioning accuracy and repeatability after long-time the use.
Dependence motion model within reason, simple structure, control accuracy satisfies practical index.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is a course of work schematic diagram of the present invention.
Fig. 3 is the electrical schematic diagram of driver module of the present invention.
Fig. 4 is an electric control system schematic diagram of the present invention.
The specific embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
1. system mechanics structure
The present invention is by photoelectric encoder 1, controller 2, drive circuit 3, ac motor 4, screw mandrel 5, back backgauge 6, workbench 7, form near switch 8 (calibration sensor), sheet metal 9 and belt gear 10, and system architecture as shown in Figure 1.Except drive circuit 3, controller and photoelectric encoder 1, other facility and common folding brake and indistinction.
2. electrical installation principle
Electric control system principle of the present invention as shown in Figure 4.This system is mainly by photoelectric encoder 1, controller 2, driver module 3, motor 4, form near switch 8 (as calibration sensor), transfer relay 11, A.C. contactor 12 (just changeing), A.C. contactor 13 (counter-rotating), power transformer 14 and travel switch 15,16. A.C. contactor 12,13 interlockings are used for the rotating of drive motor; During normal the operation, transfer relay 11 is in power failure state, when the needs motor brake stops, only after A.C. contactor 12 or 13 dead electricity, just may getting; By transfer relay 11, controller 2 sends pulse-width signal and is applied on the winding of motor 4 through the required DC voltage of driver module 3 output brakings; Controller 2 calculates the target location and the current location of back backgauge according to the electro-optical package encoder, sends control signal in good time, finishes the accurate location fast of backgauge 6 behind the folding brake.The effect of travel switch 15,16 is to guarantee that back backgauge 6 moves in the scope of safety.
3. braking driver module
The electrical principle of driver module 3 as shown in Figure 3, it is made up of rectification module 21, dropping resistor 22, diode 23, voltage-stabiliser tube 24, electric capacity 25, optocoupler 26, MOSFET27, current-limiting resistance 28 and fly-wheel diode 29 etc.This module is the drive circuit between controller 1 and ac motor 4, it has mainly acted on two: the one, three-phase alternating current is converted to direct current, the 2nd, according to the brake signal of numerical control device output, suitable direct current is put on the stator winding of ac motor 4, make it to produce braking moment.
4. position probing and control
The present invention utilizes the output signal of main shaft photoelectric encoder 1, discerns current location, speed and the acceleration of back backgauge 6 through the processing of controller 2.Controller 2 sends instruction according to the Place object of setting and makes alternating current generator 4 direction running in accordance with regulations; When after after backgauge 6 arrives appropriate locations, controller 2 sends motor dead electricity signal; Because effect of inertia, back backgauge 6 slides continuing, and at this moment, speed and positional information that controller 2 is current according to back backgauge 6 are predicted the distance that it will slide, and sent the brake signal of suitable size on this basis; When motion object during very near target, controller 2 sends final brake signal, finishes disposable accurate location.
5. certainty of measurement is from dynamic(al) correction
Because the back and forth movement of back backgauge 6 can produce accumulated error unavoidably, the present invention has designed calibration sensor 8, demarcates whenever the sheet metal 9 of back on the backgauge 6 just carries out an automated location during through calibration sensor 8, thereby eliminates accumulated error effectively.
6. safety interlocking
The present invention utilizes a transfer relay 11 to realize the safety interlocking of brake signal; Have only when the instruction of motor dead electricity and send, after the three- phase ac contactor 12,13 of drive motor was threaded off, this relay 11 just inserted motor 4 loops with driver module 3; After finishing, braking cuts off the brake circuit of driver module 3 again automatically.
7. make a concession automatically
To close-in target, in order to guarantee enough coasting distances, controller can make back shelves material make automatically and make a concession action.
8. controller
Controller is equipped with LED demonstration and operation keyboard and suitable I/O interface, the built-in switch power supply by 8 general chip microcontroller.
The function that the present invention realizes is as follows:
● the back backgauge to bender positions control.
● the dead block of bender vertical slipper is positioned control.
● three row's charactrons show simultaneously: work step presses down number of times, X-axis position, the information of Y-axis position.
●
Control accuracy can reach ± 0.10mm.
●
Effectively eliminate accumulated error.
● unidirectional and two-way location, eliminate the leading screw gap.
● make a concession automatically and prevent to escape material, avoid the interference of rear material stopping device and workpiece, reduce wear, improve positioning accuracy.
● have the de-energized memory function, parameter, position and program are carried out scene protection.
● have quick position tutorial function.
● manual, semi-automatic, automatic (programming) three kinds of operational modes are arranged.
● the multiplex (MUX) goes on foot programming can realize that the multiplex (MUX) goes on foot part by one-step processing, enhances productivity.
● the parameter of the automatic memory operation personnel setting of system.
● have the soft limit function of electronics.
Claims (6)
1. positioning numerical control device that is used for bending machine tool, comprise ac motor (4), screw mandrel (5), back backgauge (6), workbench (7), be that calibration sensor (8), sheet metal (9) and belt gear (10) are formed near switch, it is characterized in that: an end of the main shaft of described positioning numerical control device links to each other with photoelectric encoder (1), series controller (2) and driver module (3) between described ac motor (4) and photoelectric encoder (1).
2. a kind of positioning numerical control device that is used for bending machine tool according to claim 1, it is characterized in that: between described ac motor (4) and driver module (3), be associated with transfer relay (11), it is in parallel with transfer relay (11) just to deliver stream contactor (12) and counter-rotating A.C. contactor (13) back in parallel, power transformer (14) is just being delivered the stream contactor and is being linked to each other with controller (2) with the counter-rotating A.C. contactor by travel switch and another group transfer relay identical with above-mentioned annexation of two series connection.
3. a kind of positioning numerical control device that is used for bending machine tool according to claim 1, it is characterized in that: described driver module (3) is by rectification module (21), dropping resistor (22), diode (23), voltage-stabiliser tube (24), electric capacity (25), optocoupler (26), MOSFET (27), current-limiting resistance (28) and fly-wheel diode (29) are formed, the negative pole of described fly-wheel diode (29) links to each other with rectification module (21) by current-limiting resistance (28), rectification module (21) is by dropping resistor (22), diode (23) and voltage-stabiliser tube (24) parallel with one another and electric capacity (25) and optocoupler (26) join, and optocoupler (26) links to each other with MOSFET (27).
4. a kind of positioning numerical control device that is used for bending machine tool according to claim 1 is characterized in that: described controller (2) is equipped with LED demonstration and operation keyboard and suitable I/O interface, the built-in switch power supply by 8 chip microcontroller.
5. one kind is used the described a kind of method that is used for the positioning numerical control device of bending machine tool of claim 1, comprises the following steps:
(1) main shaft photoelectric encoder output signal, current location, speed and the acceleration of back backgauge are discerned in the processing of process controller;
(2) controller sends instruction according to the Place object of setting and makes alternating current generator direction running in accordance with regulations;
(3) after backstop expected to reach desired location, controller sent motor dead electricity signal;
(4) owing to effect of inertia, back backgauge slides continuing, and at this moment, controller is predicted the distance that it will slide, and sent the brake signal of suitable size on this basis according to current speed and the positional information of back backgauge;
(5) when motion object during very near target, controller sends final brake signal, finishes disposable accurate location.
6. a kind of use according to claim 5 is used for the method for the positioning numerical control device of bending machine tool, it is characterized in that:
Sheet metal on the described back backgauge just carries out an automated location when passing through calibration sensor and demarcates.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100565152A CN101623827B (en) | 2009-08-14 | 2009-08-14 | Positioning numerical control device and method used for bending machine tool |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100565152A CN101623827B (en) | 2009-08-14 | 2009-08-14 | Positioning numerical control device and method used for bending machine tool |
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| CN101623827A true CN101623827A (en) | 2010-01-13 |
| CN101623827B CN101623827B (en) | 2012-05-09 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102299504A (en) * | 2010-06-25 | 2011-12-28 | 上海宝钢工业检测公司 | Unbalance protection method for forward and reverse rotation switching operating asynchronous motor |
| CN102332851A (en) * | 2011-08-23 | 2012-01-25 | 中国北车股份有限公司大连电力牵引研发中心 | Forward/reverse interlocking device of motor |
| CN103008772A (en) * | 2012-12-13 | 2013-04-03 | 南京埃斯顿自动化股份有限公司 | Positioning method and positioning system for back barrier material of sheet shear or bending machine |
| CN104460507A (en) * | 2014-11-18 | 2015-03-25 | 天津市津达执行器有限公司 | Non-braking intelligent control method for electric actuating mechanism |
| CN105537676A (en) * | 2015-12-30 | 2016-05-04 | 南京埃斯顿自动化股份有限公司 | Intelligent positioning method for shearing and bending machine tool |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2508894Y (en) * | 2001-03-08 | 2002-09-04 | 南京埃斯顿工业自动化有限公司 | Special Digital control system for economic plate shearing machine and bender |
| CN100384588C (en) * | 2005-07-13 | 2008-04-30 | 南京埃斯顿数字技术有限公司 | Bending machine control method and system |
| CN100504696C (en) * | 2006-10-19 | 2009-06-24 | 南京埃斯顿工业自动化有限公司 | Method and system for rear material-fending positioning compensation of plate shearing machine and bending machine |
-
2009
- 2009-08-14 CN CN2009100565152A patent/CN101623827B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102299504A (en) * | 2010-06-25 | 2011-12-28 | 上海宝钢工业检测公司 | Unbalance protection method for forward and reverse rotation switching operating asynchronous motor |
| CN102332851A (en) * | 2011-08-23 | 2012-01-25 | 中国北车股份有限公司大连电力牵引研发中心 | Forward/reverse interlocking device of motor |
| CN103008772A (en) * | 2012-12-13 | 2013-04-03 | 南京埃斯顿自动化股份有限公司 | Positioning method and positioning system for back barrier material of sheet shear or bending machine |
| CN103008772B (en) * | 2012-12-13 | 2015-10-14 | 南京埃斯顿自动化股份有限公司 | The localization method of a kind of plate shearing machine or rear baffle of bending machine and navigation system |
| CN104460507A (en) * | 2014-11-18 | 2015-03-25 | 天津市津达执行器有限公司 | Non-braking intelligent control method for electric actuating mechanism |
| CN105537676A (en) * | 2015-12-30 | 2016-05-04 | 南京埃斯顿自动化股份有限公司 | Intelligent positioning method for shearing and bending machine tool |
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| CN101623827B (en) | 2012-05-09 |
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