CN104174743A - High accuracy sheet metal part stamping forming control system and control method thereof - Google Patents
High accuracy sheet metal part stamping forming control system and control method thereof Download PDFInfo
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- CN104174743A CN104174743A CN201410401749.7A CN201410401749A CN104174743A CN 104174743 A CN104174743 A CN 104174743A CN 201410401749 A CN201410401749 A CN 201410401749A CN 104174743 A CN104174743 A CN 104174743A
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- pressure
- drawbead
- blank holder
- sheet metal
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Abstract
The invention discloses a high accuracy sheet metal part stamping forming control system and a control method thereof. In the high accuracy sheet metal part stamping forming control system, a molding die and a stamping control module are adopted, wherein the molding die includes a blank holder with a molding port formed in the middle; a draw bead ejection cylinder is arranged on the periphery of the molding port; draw beads are arranged in the draw bead ejection cylinder; the draw bead ejection cylinder is connected with the return circuit of the stamping control module. Based on the control method of the high accuracy sheet metal part stamping forming control system, the closed loop control method is adopted during stamping to control the pressure of the draw bead ejection cylinder, so that the stretching heights of the draw beads are changed and local flow limiting or flow opening of the sheet metal part is implemented; the blank holder force is controlled to vary according to the pre-set curve, so that the overall plastic flow of the sheet metal part is effectively controlled.
Description
Technical field
The present invention relates to the high-accuracy stamping control system of a kind of sheet metal component and control method thereof.
Background technology
The high-accuracy stamping requirement of sheet metal component is controlled the resilience producing in sheet metal component forming process, how accurately predicting resilience be that high-performance Accurate Shaping manufacturing discipline is needed one of problem in science of solution badly to its control.
Pressure variable edge force technology is by adjustable pressure or hydraulic pressure, the technology that pressure-pad-force that pressure pad or hydraulic die cushion provide is changed along with stroke, and it can control the Plastic Flow of sheet material effectively, thereby controls the resilience of sheet material.But accurately determine that to control the pressure-pad-force of resilience still more difficult, be mainly reflected in and obtain that to optimize time of pressure variable edge force curve cost too many, or existing method awaits further raising improving on plate sheet metal component forming accuracy.Current pressure variable edge force technology can only be controlled the sheet metal component overall situation, needs local carrying out current limliting or open stream for more complicated sheet metal component, could control better the resilience of sheet material.
Carry out current limliting or open stream in order to realize sheet metal component part, scholar has proposed the technical research of piecemeal blank holder, and blank holder circumferentially or is radially divided into some, respectively it is controlled.But it is defectiveness also, blank holder separates the blank holder surface height difference that control makes, and leaves larger impression on drip molding, also comparatively difficult to its piecemeal pressure-pad-force control, can not realize overall parabolical Optimal Control track route.
Summary of the invention
In order to solve the deficiencies in the prior art, the present invention proposes the high-accuracy stamping control system of a kind of sheet metal component and control method thereof.The present invention, by adjustable drawbead and the acting in conjunction of variation pressure-pad-force, effectively controls the Plastic Flow of sheet material, makes the high-accuracy shaping of sheet metal component.
Technical scheme of the present invention is as described below:
The high-accuracy stamping control system of sheet metal component, it is characterized in that, comprise plastotype mould and punching press control module, described plastotype mould comprises blank holder, in the middle of blank holder, leave plastotype mouth, the surrounding of plastotype mouth is provided with drawbead liftout tank, in drawbead liftout tank, is provided with drawbead, and drawbead liftout tank connects the loop of punching press control module;
Described punching press control module comprises sensor, analog-to-digital conversion card, host computer, proportional pressure control valve, and described sensor comprises displacement transducer, the first pressure sensor and the second pressure sensor; Displacement transducer connects blank holder, for detection of the displacement information of blank holder; The first pressure sensor connects drawbead liftout tank, for detection of the pressure of drawbead liftout tank; The second pressure sensor connects blank holder, for detection of pressure-pad-force; Displacement transducer, the first pressure sensor and the second pressure sensor connect analog-to-digital conversion card, and analog-to-digital conversion card connects host computer, and host computer is connected with digital-to-analogue conversion card, and digital-to-analogue conversion cartoon is crossed proportional amplifier connecting electronic proportional pressure control valve.
The high-accuracy stamping control system of sheet metal component of the present invention, the output of described the first pressure sensor and the second pressure sensor connects dynamic strain indicator, and displacement transducer and dynamic strain indicator connect analog-to-digital conversion card through voltage signal limiter.
The high-accuracy stamping control system of sheet metal component of the present invention, described plastotype mould also comprises die and hydraulic cylinder, and hydraulic cylinder is communicated with blank holder, and die and blank holder interval arrange.
According to the high-accuracy stamping control system of above-mentioned sheet metal component, propose a kind ofly by adjustable drawbead and change the closed loop control method that combines of pressure-pad-force, adopt following steps:
(1) on host computer, preset pressure history and the pressure-pad-force change curve of blank holder displacement changing curve, drawbead liftout tank, on host computer, set current/voltage value corresponding to pressure-pad-force zero-bit;
(2) it is up that hydraulic cylinder drives blank holder, displacement transducer is changed to data signal by the displacement signal of blank holder and is uploaded to host computer, compare with setting blank holder displacement changing curve, reach after predefined pressure-pad-force zero-bit, host computer is sent out control instruction by up valve power-off, makes blank holder in place in precalculated position;
(3) blank holder in place after, sheet metal component is placed between blank holder and die and starts punching press, displacement transducer detects the punching press displacement signal of blank holder, the pressure signal that the first pressure sensor detects drawbead liftout tank, the second pressure sensor detects pressure-pad-force signal, the pressure signal of punching press displacement signal, drawbead liftout tank and pressure-pad-force signal is converted to respectively to data signal and is uploaded to host computer;
(4) host computer is compared the data signal of reception respectively with pressure history and the pressure-pad-force change curve of drawbead liftout tank, according to the punching press situation of comparison result prediction sheet metal component, and output control signal;
(5) control signal is converted to drive current, drive the oil drain quantity of controlling electronics proportional pressure control valve, thereby pressure and the pressure-pad-force of controlling drawbead liftout tank, repeating step (3) is until sheet stamping forming is realized the high-accuracy stamping closed-loop control of sheet metal component.
In described step (1), current/voltage value corresponding to the pressure history of predefined drawbead displacement changing curve, drawbead liftout tank, pressure-pad-force change curve and pressure-pad-force zero-bit is to control the optimum value of sheet metal component Plastic Flow.
In described step (3), the pressure signal of drawbead liftout tank and pressure-pad-force signal are first converted to voltage signal through dynamic strain indicator, voltage signal after conversion is connected analog-to-digital conversion card with the displacement signal of drawbead through voltage signal limiter, and the data signal after conversion is uploaded to respectively to host computer.
Control signal is first converted to voltage signal through digital-to-analogue conversion card in described step (5), then provides suitable drive current through proportional amplifier for electronics proportional pressure control valve.
In described step (5), drive the oil drain quantity of controlling electronics proportional pressure control valve, thereby control the pressure of drawbead liftout tank, change the stretching height of drawbead, sheet metal component is carried out local current limliting or opens stream.
In described step (5), drive the oil drain quantity of controlling electronics proportional pressure control valve, provide thereby control hydraulic cylinder the pressure-pad-force changing with punching press progress.
The present invention adopts technique scheme, and the useful technique effect of obtaining is as follows:
Based on the control method of the high-accuracy stamping control system of sheet metal component, in punching course, adopt the pressure of closed loop control method control drawbead liftout tank, change the stretching height of drawbead, sheet metal component is carried out local current limliting or opens stream.The size of controlling pressure-pad-force, makes pressure-pad-force change according to predefined curve, effectively controls the Plastic Flow of sheet metal component entirety.
The pressure signal of drawbead liftout tank and pressure-pad-force signal are first converted to voltage signal through dynamic strain indicator, carry out in real time adaptability to changes test.
The current/voltage value corresponding to pressure history, pressure-pad-force change curve and pressure-pad-force zero-bit of predefined drawbead displacement changing curve, drawbead liftout tank is to control the optimum value of sheet metal component Plastic Flow.Realize the adjustment of best drawbead height, and the setting of optimum punching press track.
Brief description of the drawings
Fig. 1 is blank holder structural representation.
Fig. 2 is drawbead structural representation.
Fig. 3 is the high-accuracy stamping control program schematic diagram of sheet metal component.
Fig. 4 is the high-accuracy stamping control system structured flowchart of sheet metal component.
Detailed description of the invention
1 to 4 pair of the specific embodiment of the present invention is described further by reference to the accompanying drawings:
The high-accuracy stamping control system of sheet metal component, comprises plastotype mould and punching press control module.Plastotype mould comprises blank holder 3, in the middle of blank holder, leaves plastotype mouth 2, and the surrounding of plastotype mouth 2 is provided with drawbead liftout tank, is provided with drawbead 1 in drawbead liftout tank, and drawbead liftout tank connects the loop 4 of punching press control module.Plastotype mould also comprises die and hydraulic cylinder, and hydraulic cylinder is communicated with blank holder, and die and blank holder interval arrange.
Punching press control module comprises sensor, analog-to-digital conversion card, host computer, proportional pressure control valve, and described sensor comprises displacement transducer, the first pressure sensor and the second pressure sensor; Displacement transducer connects blank holder, for detection of the displacement information of blank holder; The first pressure sensor connects drawbead liftout tank, for detection of the pressure of drawbead liftout tank; The second pressure sensor connects blank holder, for detection of pressure-pad-force; Displacement transducer, the first pressure sensor and the second pressure sensor connect analog-to-digital conversion card, and analog-to-digital conversion card connects host computer, and host computer is connected with digital-to-analogue conversion card, and digital-to-analogue conversion cartoon is crossed proportional amplifier connecting electronic proportional pressure control valve.The output of the first pressure sensor and the second pressure sensor connects dynamic strain indicator, and displacement transducer and dynamic strain indicator connect analog-to-digital conversion card through voltage signal limiter.
Analog-to-digital conversion card and digital-to-analogue conversion card all have multiplexer channel, and analog-to-digital conversion card is connected with host computer by pci bus as I/O equipment, and host computer is linked and connect by pci bus and digital-to-analogue conversion.
According to the high-accuracy stamping control system of above-mentioned sheet metal component, propose a kind ofly by adjustable drawbead and change the closed loop control method that combines of pressure-pad-force, adopt following steps:
(1) on host computer, preset pressure history and the pressure-pad-force change curve of blank holder displacement changing curve, drawbead liftout tank, on host computer, set current/voltage value corresponding to pressure-pad-force zero-bit;
The current/voltage value corresponding to pressure history, pressure-pad-force change curve and pressure-pad-force zero-bit of predefined drawbead displacement changing curve, drawbead liftout tank is to control the optimum value of sheet metal component Plastic Flow.
(2) it is up that hydraulic cylinder drives blank holder, displacement transducer is changed to data signal by the displacement signal of blank holder and is uploaded to host computer, compare with setting blank holder displacement changing curve, reach after predefined pressure-pad-force zero-bit, host computer is sent out control instruction by up valve power-off, makes blank holder in place in precalculated position.
(3) blank holder in place after, sheet metal component is placed between blank holder and die and starts punching press, displacement transducer detects the punching press displacement signal of blank holder, the pressure signal that the first pressure sensor detects drawbead liftout tank, the second pressure sensor detects pressure-pad-force signal, the pressure signal of punching press displacement signal, drawbead liftout tank and pressure-pad-force signal is converted to respectively to data signal and is uploaded to host computer;
The pressure signal of drawbead liftout tank and pressure-pad-force signal are first converted to voltage signal through dynamic strain indicator, voltage signal after conversion is connected analog-to-digital conversion card with the displacement signal of drawbead through voltage signal limiter, and the data signal after conversion is uploaded to respectively to host computer.
(4) host computer is compared the data signal of reception respectively with pressure history and the pressure-pad-force change curve of drawbead liftout tank, according to the punching press situation of comparison result prediction sheet metal component, and output control signal.
(5) control signal is converted to drive current, drive the oil drain quantity of controlling electronics proportional pressure control valve, thereby pressure and the pressure-pad-force of controlling drawbead liftout tank, repeating step (3) is until sheet stamping forming is realized the high-accuracy stamping closed-loop control of sheet metal component.
Control signal is first converted to voltage signal through digital-to-analogue conversion card in step (5), then provides suitable drive current through proportional amplifier for electronics proportional pressure control valve.
In step (5), drive the oil drain quantity of controlling electronics proportional pressure control valve, thereby control the pressure of drawbead liftout tank, change the stretching height of drawbead, sheet metal component is carried out local current limliting or opens stream.
In step (5), drive the oil drain quantity of controlling electronics proportional pressure control valve, provide thereby control hydraulic cylinder the pressure-pad-force changing with punching press progress.
Based on the control method of the high-accuracy stamping control system of sheet metal component, in punching course, adopt the pressure of closed loop control method control drawbead liftout tank, change the stretching height of drawbead, sheet metal component is carried out local current limliting or opens stream.The size of controlling pressure-pad-force, makes pressure-pad-force change according to predefined curve, effectively controls the Plastic Flow of sheet metal component entirety.
A kind of effective control program that the present invention has been the high-accuracy stamping proposition of sheet metal component, realizes the drawbead height adjustment of differing heights and the best of breed of pressure variable edge force in zones of different, controls carrying out precision in sheet metal component punching course.May be used in production line, improve the forming accuracy of stamping parts.
Certainly; more than explanation is only preferred embodiment of the present invention; the present invention is not limited to enumerate above-described embodiment; should be noted that; any those of ordinary skill in the art are under the guidance of this description; that makes is allly equal to alternative, obvious form of distortion, within all dropping on the essential scope of this description, ought to be subject to protection of the present invention.
Claims (9)
1. the high-accuracy stamping control system of sheet metal component, it is characterized in that, comprise plastotype mould and punching press control module, described plastotype mould comprises blank holder, in the middle of blank holder, leave plastotype mouth, the surrounding of plastotype mouth is provided with drawbead liftout tank, in drawbead liftout tank, is provided with drawbead, and drawbead liftout tank connects the loop of punching press control module;
Described punching press control module comprises sensor, analog-to-digital conversion card, host computer, proportional pressure control valve, and described sensor comprises displacement transducer, the first pressure sensor and the second pressure sensor; Displacement transducer connects blank holder, for detection of the displacement information of blank holder; The first pressure sensor connects drawbead liftout tank, for detection of the pressure of drawbead liftout tank; The second pressure sensor connects blank holder, for detection of pressure-pad-force; Displacement transducer, the first pressure sensor and the second pressure sensor connect analog-to-digital conversion card, and analog-to-digital conversion card connects host computer, and host computer is connected with digital-to-analogue conversion card, and digital-to-analogue conversion cartoon is crossed proportional amplifier connecting electronic proportional pressure control valve.
2. the high-accuracy stamping control system of sheet metal component according to claim 1, it is characterized in that, the output of described the first pressure sensor and the second pressure sensor connects dynamic strain indicator, and displacement transducer and dynamic strain indicator connect analog-to-digital conversion card through voltage signal limiter.
3. the high-accuracy stamping control system of sheet metal component according to claim 2, is characterized in that, described plastotype mould also comprises die and hydraulic cylinder, and hydraulic cylinder is communicated with blank holder, and die and blank holder interval arrange.
4. the control method of the high-accuracy stamping control system of sheet metal component as claimed in claim 3, is characterized in that, described control method adopts following steps:
(1) on host computer, preset pressure history and the pressure-pad-force change curve of blank holder displacement changing curve, drawbead liftout tank, on host computer, set current/voltage value corresponding to pressure-pad-force zero-bit;
(2) it is up that hydraulic cylinder drives blank holder, displacement transducer is changed to data signal by the displacement signal of blank holder and is uploaded to host computer, compare with setting blank holder displacement changing curve, reach after predefined pressure-pad-force zero-bit, host computer is sent out control instruction by up valve power-off, makes blank holder in place in precalculated position;
(3) blank holder in place after, sheet metal component is placed between blank holder and die and starts punching press, displacement transducer detects the punching press displacement signal of blank holder, the pressure signal that the first pressure sensor detects drawbead liftout tank, the second pressure sensor detects pressure-pad-force signal, the pressure signal of punching press displacement signal, drawbead liftout tank and pressure-pad-force signal is converted to respectively to data signal and is uploaded to host computer;
(4) host computer is compared the data signal of reception respectively with pressure history and the pressure-pad-force change curve of drawbead liftout tank, according to the punching press situation of comparison result prediction sheet metal component, and output control signal;
(5) control signal is converted to drive current, drive the oil drain quantity of controlling electronics proportional pressure control valve, thereby pressure and the pressure-pad-force of controlling drawbead liftout tank, repeating step (3) is until sheet stamping forming is realized the high-accuracy stamping closed-loop control of sheet metal component.
5. control method according to claim 4, it is characterized in that, in described step (1), current/voltage value corresponding to the pressure history of predefined drawbead displacement changing curve, drawbead liftout tank, pressure-pad-force change curve and pressure-pad-force zero-bit is to control the optimum value of sheet metal component Plastic Flow.
6. control method according to claim 4, it is characterized in that, in described step (3), the pressure signal of drawbead liftout tank and pressure-pad-force signal are first converted to voltage signal through dynamic strain indicator, voltage signal after conversion is connected analog-to-digital conversion card with the displacement signal of drawbead through voltage signal limiter, and the data signal after conversion is uploaded to respectively to host computer.
7. control method according to claim 4, is characterized in that, control signal is first converted to voltage signal through digital-to-analogue conversion card in described step (5), then provides suitable drive current through proportional amplifier for electronics proportional pressure control valve.
8. control method according to claim 4, it is characterized in that, in described step (5), drive the oil drain quantity of controlling electronics proportional pressure control valve, thereby control the pressure of drawbead liftout tank, the stretching height that changes drawbead, carries out local current limliting or opens stream sheet metal component.
9. control method according to claim 4, is characterized in that, drives the oil drain quantity of controlling electronics proportional pressure control valve in described step (5), provides thereby control hydraulic cylinder the pressure-pad-force changing with punching press progress.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410401749.7A CN104174743B (en) | 2014-08-15 | 2014-08-15 | The high-accuracy stamping control system of sheet metal component and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410401749.7A CN104174743B (en) | 2014-08-15 | 2014-08-15 | The high-accuracy stamping control system of sheet metal component and control method thereof |
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| CN104174743A true CN104174743A (en) | 2014-12-03 |
| CN104174743B CN104174743B (en) | 2016-03-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111266452A (en) * | 2020-02-11 | 2020-06-12 | 燕山大学 | Blocking and edge pressing device based on electric control permanent magnet technology and edge pressing force control method |
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| US4195510A (en) * | 1978-06-26 | 1980-04-01 | Juergens William A | Draw bead having alternating pressure surfaces and grooves |
| JP2003266132A (en) * | 2002-03-15 | 2003-09-24 | Toyota Motor Corp | Hydraulic forming method, and hydraulic forming device |
| CN101290280A (en) * | 2008-06-05 | 2008-10-22 | 北京航空航天大学 | Tepid environment universal sheet shaping test machine |
| CN201380239Y (en) * | 2009-04-09 | 2010-01-13 | 重庆工学院 | Die capable of changing resistance force of draw bead |
| DE102009028769A1 (en) * | 2009-08-21 | 2011-02-24 | Ford Global Technologies, LLC, Dearborn | Double-acting thermoforming device for shaping metal sheets, has drive device comprising deflection device interconnected between drawing punch and draw bead so that movement step of fitting of bead and drawing groove is drivable by punch |
| CN102327945A (en) * | 2010-07-14 | 2012-01-25 | 成都飞机工业（集团）有限责任公司 | Hydrodynamic deep drawing equipment for forming deep cavity parts |
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2014
- 2014-08-15 CN CN201410401749.7A patent/CN104174743B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4195510A (en) * | 1978-06-26 | 1980-04-01 | Juergens William A | Draw bead having alternating pressure surfaces and grooves |
| JP2003266132A (en) * | 2002-03-15 | 2003-09-24 | Toyota Motor Corp | Hydraulic forming method, and hydraulic forming device |
| CN101290280A (en) * | 2008-06-05 | 2008-10-22 | 北京航空航天大学 | Tepid environment universal sheet shaping test machine |
| CN201380239Y (en) * | 2009-04-09 | 2010-01-13 | 重庆工学院 | Die capable of changing resistance force of draw bead |
| DE102009028769A1 (en) * | 2009-08-21 | 2011-02-24 | Ford Global Technologies, LLC, Dearborn | Double-acting thermoforming device for shaping metal sheets, has drive device comprising deflection device interconnected between drawing punch and draw bead so that movement step of fitting of bead and drawing groove is drivable by punch |
| CN102327945A (en) * | 2010-07-14 | 2012-01-25 | 成都飞机工业（集团）有限责任公司 | Hydrodynamic deep drawing equipment for forming deep cavity parts |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111266452A (en) * | 2020-02-11 | 2020-06-12 | 燕山大学 | Blocking and edge pressing device based on electric control permanent magnet technology and edge pressing force control method |
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| CN104174743B (en) | 2016-03-16 |
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