CN100509198C - Die cushion control device and die cushion control method - Google Patents
Die cushion control device and die cushion control method Download PDFInfo
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- CN100509198C CN100509198C CNB2005100780470A CN200510078047A CN100509198C CN 100509198 C CN100509198 C CN 100509198C CN B2005100780470 A CNB2005100780470 A CN B2005100780470A CN 200510078047 A CN200510078047 A CN 200510078047A CN 100509198 C CN100509198 C CN 100509198C
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Abstract
A die cushion control device for controlling the movement of a cushion pad, comprising: a cushion driving mechanism, which drives the cushion pad to lift while applying an upward acting force; a position measuring mechanism for measuring the position of the cushion pad; a load measuring means for measuring a load generated on the cushion pad; a timing detection means for detecting the occurrence timing and disappearance timing of the load; a control means for controlling the cushion driving means, the control means performing position control for measuring the position of the cushion pad and controlling the position of the cushion pad so that the measured position value follows a predetermined position pattern; and load control for measuring the load generated on the cushion pad and controlling the load generated on the cushion pad so that the measured load value follows a preset load pattern, wherein the control means switches from position control to load control in accordance with the timing of the detection of the occurrence of the load by the timing detection means; the timing detection means switches from the load control to the position control in accordance with the disappearance timing of the load.
Description
Technical field
The present invention relates to synchronously control the die buffer control device and the die buffer control method of the action of cushion pad with the action of the slide block of press.
Background technology
Wrinkling in order to prevent in deep-draw processing, die cushion (below, abbreviate die-cushion as) is being set on the press.Die-cushion in the past adopts oil pressure or air to cut down output and gives birth to the buffering pressure that drives the cushion pad lifting.In order to improve the deep drawability of press, prevent workpiece fracture or distortion, need the buffering of high accuracy control die-cushion to press, the buffering when especially needing high accuracy control cushion pad down maneuver is pressed.
The die-cushion that only utilizes air to press when cushion pad moves, can not high accuracy control buffering be pressed.Utilize the die-cushion of oil pressure, when cushion pad moves, can press by control oil pressure high accuracy control buffering.But problem is the complex structure of hydraulic machine, needs strict maintenance care in addition.For this reason, in recent years, have simple in structure and do not need the die-cushion of electrical servo motor of strict maintenance care noticeable.
Open in the flat 10-202327 communique the spy, disclose the control technology of mould buffer with revolving electrical servo motor.Figure 18 be represent in the past press and the diagram of control system.
In the press shown here, the eccentric part of the bent axle in slide block 2 and the slide block mechanism 1 links.Slide block 2 is according to the rotary lifting movement of bent axle.Encoder is set on bent axle, according to the rotation of bent axle, from encoder to adjuster 100 output signals.Adjuster 100 adopts this signal to obtain the position of slide block 2.
In addition, in the press shown here, the output shaft of servomotor 16 and the threaded shank 112b of ball screw link, and this threaded shank 112b is screwed on the cushion pad 11.If the threaded shank 112b of ball screw rotates according to the rotation of servomotor 16, then cushion pad 11 is just along threaded shank 112b elevating movement.On servomotor 16, encoder is set, according to the rotation of servomotor 16, from encoder 17 to adjuster 100 output signals.Adjuster 100 adopts this signal to obtain the position of cushion pad.
Move 1 initial stage the stroke from top dead-centre at slide block 2, adjuster 100 is controlled the position of cushion pad 11 according to the position of slide block 2.By this control, cushion pad 11 descends with the speed lower than the decrease speed of slide block 2, and moves with the mode that workpiece 4 contacts with patrix 3a at assigned position.If patrix 3a contacts with workpiece 4, cushion pad 11 just begins to accept the load of slide block 2.At this moment, the current value of servomotor 16 changes.If detect this electric current variation, adjuster 100 is just obtained buffering based on current value and is pressed, and presses the mode of the pressure figure of following the trail of predefined buffering pressure to control servomotor 16 with the buffering of obtaining.So, while producing active force upwards, cushion pad 11 descends, arrive bottom dead centre.
The error effect deep drawability of control becomes the fracture or the deformation reason of workpiece 4.Thereby adjuster 100 need press the mode of following the trail of the tonogram picture of setting to control the motion of cushion pad 11 with the buffering of obtaining.
About the precision of the action of cushion pad, for example open in the flat 10-202327 communique and have problems above-mentioned spy.Generally, FEEDBACK CONTROL must be the physical quantity of measuring on the control object, based on the closed-loop fashion of this measured value control control object.As long as carry out the FEEDBACK CONTROL that the buffering of cushion pad is pressed, just need be determined at the load that cushion pad produces.
Open in the flat 10-202327 communique, do not measure any physical quantity, only measure the current value of the servomotor that drives cushion pad from the cushion pad side the spy.Although the load that produces at cushion pad and the current value of servomotor have relative relation to a certain degree, the accepted argument that also differs has certain relation.Thereby, say that strictly the FEEDBACK CONTROL that above-mentioned spy opens flat 10-202327 communique be we can say and do not formed closed loop.From then on consider, open in the technology of flat 10-202327 communique that the misgivings of action that can not high accuracy control cushion pad are arranged above-mentioned spy.Fracture or distortion take place in workpiece when the most serious.
Summary of the invention
The present invention proposes in view of the above fact, and its purpose is to provide a kind of and cushions the FEEDBACK CONTROL of pressure with closed loop, controls die buffer control device and die buffer control method that the buffering of cushion pad is pressed accurately.
The 1st invention is a kind of die buffer control device that is used to control the action of cushion pad, it is characterized in that having:
The pad driving mechanism drives cushion pad while it applies active force lifting upwards;
Position finding mechanism, it measures the position of cushion pad;
Mechanism is measured in load, and it is used to be determined at the load that cushion pad produces;
Opportunity testing agency, it is used to detect occurrence time and disappearance opportunity of described load;
Controlling organization, it controls described pad driving mechanism,
Described controlling organization carries out Position Control and load control, and described Position Control is to measure the position of cushion pad, so that the mode of the predefined location graphic of position finding value trace is controlled the position of cushion pad; Described load control is to be determined at the load that cushion pad produces, and is controlled at the load that cushion pad produces so that the load measured value is followed the trail of the mode of predefined load figure,
And described controlling organization is accompanied by the occurrence time by described testing agency's detection load on opportunity, switches to load control from Position Control; Be accompanied by disappearance opportunity, switch to Position Control from load control by described testing agency's detection load on opportunity.
As described in the 2nd invention was invented as the 1st, it is characterized in that: described load determination part had deformeter, the distortion that is used to measure described cushion pad or supports the supporter of described cushion pad; Adopt the measurement result of deformeter, obtain the value that is equivalent to load.
The 3rd invention is characterized in that as described in inventing as the 1st: described load determination part has the hydraulic chamber that is installed between described cushion pad and the described pad driving mechanism, the pressure sensor of measuring the pressure in the hydraulic chamber; The measurement result of adopts pressure sensor is obtained the value that is equivalent to load.
The the 1st～the 3rd invention is described.
Bottom at the slide block of press is provided with patrix, above the cushion pad of die-cushion workpiece is set.If along with the descending motion of slide block, patrix contacts with workpiece, just produces the load of the load generation of cause slide block at cushion pad.And cushion pad is by the driving of servomotor, produce upwards active force on one side, synchronous with cushion pad on one side, drop to bottom dead centre (pad driving mechanism).
Deformeter is pasted in side at cushion pad.By this deformeter, the pressure that is determined at the cushion pad generation as load promptly cushions pressure (load determination part).The measured value of deformeter is exported to the pad control part.If produce pressure at cushion pad, the measured value of deformeter just reaches more than the setting.At the pad control part, detect this opportunity, judge the slide block descending motion, patrix contacts with workpiece.In addition, if the pressure of cushion pad disappears, the measured value of deformeter just drops to below the setting.Detect this opportunity at the pad control part, judge that slide block rotates ascending motion (test section on opportunity) from bottom dead centre.At the pad control part, preestablish the pressure figure that buffering is pressed.From the occurrence time of load to the opportunity of disappearance, the force value of pad control part comparative measurements and the pressure figure of setting, in the mode that force value is followed the trail of pressure figure, control servomotor (control part).
Also can replace deformeter, adopts pressure sensor is determined at the load that cushion pad produces.In such cases,, on the part of the load of accepting cushion pad, hydraulic chamber is set for the power-transmission system of cushion pad and servomotor.And, by the pressure in this hydraulic chamber of determination of pressure sensor.
According to the 1st～the 3rd invention, directly measure the value of expression load from the cushion pad of control object, carry out FEEDBACK CONTROL.
The 4th invention is characterized in that as described in the 1st invention: at 1 processing stations of press, have a plurality of described cushion pads, a plurality of described pad driving mechanism, mechanism, a plurality of described control part are measured in a plurality of described load, the action of independent each cushion pad of control.
The 4th invention is described.
1 processing stations at press is provided with a plurality of pads.
Deformeter is pasted in side at each cushion pad, and according to this deformeter, the pressure that is determined at corresponding cushion pad generation as load promptly cushions pressure.The measured value of deformeter is exported to the pad control part.At the pad control part, preestablish the pressure figure that the buffering corresponding with each cushion pad pressed.The force value of pad control part comparative measurements and the pressure figure of setting are with the mode that force value is followed the trail of pressure figure, the servomotor that control is corresponding.
According to the 4th invention, be each cushion pad directly from the control object, measure the value of expression load, each cushion pad is carried out independently FEEDBACK CONTROL respectively.
The 5th invention is the die buffer control method that is used to control the action of cushion pad, it is characterized in that, comprise: the Position Control operation, measure the position of cushion pad, in the mode of the predefined location graphic of position finding value trace, the position of control cushion pad, load control operation, be determined at the load that cushion pad produces,, be controlled at the load that cushion pad produces in the mode that the load measured value is followed the trail of predefined load figure;
Begin to produce opportunity of load at cushion pad, switch to described load control operation from described Position Control operation,
Switch to described Position Control operation from described load control operation the opportunity that the load that produces at cushion pad disappears.
The 5th invention is described.
On press, the impact when contacting with workpiece in order to relax patrix prepares acceleration.In this preparation accelerating period, measure the position of cushion pad, relatively this position finding value and predefined location graphic in the mode of position finding value trace location graphic, are controlled the so-called position feedback control of servomotor.
If patrix contacts with workpiece, cushion pad just begins to produce load.The load that detection produces at cushion pad, or after cushion pad arrives patrix and workpiece position contacting, be determined at the load that cushion pad produces, relatively this load measured value and predefined load figure, in the mode that the load measured value is followed the trail of predefined load figure, control the so-called pressure feedback control of servomotor.
So, on the opportunity that patrix contacts with workpiece, switch to pressure feedback control from position feedback control.
According to the 5th invention, in the preparation accelerating period, be each cushion pad directly from the control object, measure locative value, carry out FEEDBACK CONTROL.After preparation is quickened, be cushion pad directly from the control object, measure locative value, carry out FEEDBACK CONTROL.
According to the present invention, owing to control the timing of the pressure feedback control of cushion pad on demand, feed back the pressure feedback control of the closed loop that the buffering measured from the cushion pad body presses, therefore the buffering of cushion pad is pressed accurately.Thereby can improve the processability of forcing press.
In addition, according to the 4th invention, press owing to can change the interior buffering of 1 processing stations partly, so can improve the precision of press more.
Description of drawings
Fig. 1 is the ideograph of the formation of expression press.
Fig. 2 is the ideograph of the die-cushion of the 1st embodiment.
Fig. 3 is the vertical view of the die-cushion of the 1st embodiment.
Fig. 4 is the control block diagram of the FEEDBACK CONTROL of carrying out in the 1st embodiment.
Fig. 5 is the diagram of the action of expression slide block and die cushion.
Fig. 6 is the ideograph of the die-cushion of the 2nd embodiment.
Fig. 7 is the ideograph of the die-cushion of the 3rd embodiment.
Fig. 8 is the vertical view of the die-cushion of the 3rd embodiment.
Fig. 9 is the control block diagram of the FEEDBACK CONTROL of carrying out in the 3rd embodiment.
Figure 10 is the ideograph of the die-cushion of the 4th embodiment.
Figure 11 is the ideograph of die-cushion of the another way of the 4th embodiment.
Figure 12 is the oil hydraulic circuit figure of the 5th embodiment.
Figure 13 is the control block diagram of the FEEDBACK CONTROL of carrying out in the 5th embodiment.
Figure 14 is the oil hydraulic circuit figure of the another way of the 5th embodiment.
Figure 15 is the oil hydraulic circuit figure of the another way of the 5th embodiment.
Figure 16 is the diagram of the configuration of explanation cushion pad and driving mechanism thereof.
Figure 17 A～Figure 17 D is the vertical view of 1 processing stations.
Figure 18 be represent in the past press and the diagram of control system.
The specific embodiment
Below, with reference to the description of drawings embodiments of the present invention.
Fig. 1 is the ideograph of the formation of expression press.
On press, superposed slide block 2 and the backing plate 8 that is positioned at the bottom are set subtend mutually.Slide block 2 is accepted power from the slide block driving mechanism 1 of top, carries out elevating movement.Patrix 3a is installed in bottom at slide block 2.In addition, backing plate 8 is fixed on the top of lathe bed 9, on the top of backing plate 8 counterdie 3b is installed.A plurality of holes that above-below direction connects are set on backing plate 8 and counterdie 3b, in this hole, run through cushion pins 7.The upper end of cushion pins 7 is connected to the bottom of the holding pad 5 on the recess of being located at counterdie 3b, and the lower end of cushion pins 7 is connected on the cushion pad 11 that is located at the die-cushion 10 in the lathe bed 9.Crossbeam 6 is set, with crossbeam 6 supporting mould buffers 10 between the internal face of lathe bed 9.
[embodiment 1]
Fig. 2 is the ideograph of the die-cushion of the 1st embodiment.Fig. 3 is the vertical view of the die-cushion of the 1st embodiment.
In die-cushion 10, cushion pad 11 via ball screw 12, link parts 25, big belt wheel 13, belt 14 and small pulley 15, and links with the rotating shaft of servomotor 16.Mutual transmission of power freely between cushion pad 11 and servomotor 16.In the bottom of cushion pad 11, link the nut portions 12a of ball screw 12.The threaded shank 12b of ball screw 12 is screwed in the nut portions 12a.The bottom of threaded shank 12b is connected and links on the parts 25.Link parts 25, be supported on the crossbeam 6 by axles such as bearings, its underpart is attached on the big belt wheel 13.Small pulley 15 is attached on the rotating shaft of servomotor 16.Hang belt 14 on big belt wheel 13 and small pulley 15, mutual transmission of power freely.
Revolving servomotor 16 has rotating shaft, by supplying with electric current, the just contrary rotation of rotating shaft.If supply with electric current to servomotor 16, the rotating shaft rotation, small pulley 15, big belt wheel 13, binding parts 25, threaded shank 12b just rotatablely move.Along with rotatablely moving of threaded shank 12b, nut portions 12a is along threaded shank 12b, and above-below direction is a lifting direction rectilinear motion.So, cushion pad 11 and together elevating movement of nut portions 12a.By the electric current of control supply servomotor 16, control imposes on the active force of cushion pad 11 and promptly presses in the buffering that cushion pad 11 produces.
Various determinators are set on die-cushion 10.In order to be determined at the load that cushion pad 11 produces, paste deformeter 17 in the side of cushion pad 11.By this deformeter 17, be determined at the pressure that cushion pad 11 produces.Be provided with the lifting direction as the linear movement pick-up 18 of measuring direction between this external cushion pad 11 and the lathe bed 9.The 18a of scale portion in the linear movement pick-up 18 is located on the internal face of lathe bed 9, and head 18b is fixed on cushion pad 11 sides in the mode near the 18a of scale portion.Along with the elevating movement of cushion pad 11, head 18b moves along the 18a of scale portion.Measure the lifting position of cushion pad 11 by this line level sensor 18.Encoder 19 be located at servomotor 16 rotating shaft around.Measure the rotary speed of servomotor 16 by this encoder 19.Each measured value is inputed to pad control part 30, and output is supplied with electric current to servomotor 16.About the pad control part as described later.
In addition, each side of cushion pad 11 and and the internal face of the lathe bed 9 of each side subtend between guide 21 more than 1 is set.Guide 21 constitutes guide 21a in each side of cushion pad 11 is provided with, guide 21b outside being provided with by guide 21a in a couple of mutual engaging and outer guide 21b on the internal face of lathe bed 9.Guide 21 is to lifting direction guiding cushion pad 11.
Below, the FEEDBACK CONTROL of mould buffer is described.
Fig. 4 is the control block diagram of the FEEDBACK CONTROL of carrying out in the 1st embodiment.
It should be noted that wherein " pressure " in the pressure figure is included on the cushion pad 11 load that produces and the distortion that produces on the parts of cushion pad 11.This is because itself and load and the distortion relation of being mutually related.In addition, when as embodiment 4-5, hydraulic chamber 19 being set, also can utilize the oil pressure in the hydraulic chamber 19.
Here, about the FEEDBACK CONTROL of carrying out, pressure feedback control is described at first at pad control part 30.
The pressure that is determined at cushion pad 11 generations with deformeter 17 promptly cushions pressure, and its value is exported to pressure comparing section 33 as pressure feedback signal Spf.In pressure comparing section 33, the value of comparative pressure feedback signal Spf and the value of pressure controling signal Sp generate pressure correction signal Spc.Spc exports to pressure control part 34 with the pressure correction signal.At pressure control part 34, based on pressure correction signal Spc, obtain the suitable speed of servomotor 16, generate motor speed control signal Sr1.Sr1 exports to speed comparing section 35 with the motor speed control signal.
With the rotary speed of encoder 19 mensuration servomotors 16, its value as feedback speed signal Srf, is exported to speed comparing section 35.In speed comparing section 35, compare the value of motor speed control signal Sr1 (being Sr2) and the value of feedback speed signal Srf when position feedback control, formation speed corrected signal Src.Src exports to speed controlling portion 36 with the speed corrected signal.At speed controlling portion 36, based on speed corrected signal Src, obtain suitable current value to servomotor 16, generate current controling signal Sc.Current controling signal Sc is exported to electric current comparing section 37.
Measure the electric current of supplying with servomotor 16 by current detecting part 39, its value is exported to electric current comparing section 37 as current feedback signal Scf.In electric current comparing section 37, relatively the value of current controling signal Sc and the value of current feedback signal Scf generate electric current corrected signal Scc.Scc exports to current control division 38 with the electric current corrected signal.At current control division 38,, obtain suitable supply electric current I to servomotor 16 based on electric current corrected signal Scc.To supply with electric current I and export to current detecting part 39, supply with servomotor 16 simultaneously.So servomotor 16 drives cushion pad 11.The active force that this moment, cushion pad 11 generations on one side made progress, on one side descending motion.The buffering of so being set is pressed.
Below, position feedback control is described.
Measure the height and position of cushion pad 11 with the head 18b of linear movement pick-up 18, its value is exported to position comparing section 43 as position feed back signal Shf.In position comparing section 43, the value of comparison position feedback signal Shf and the value of position control signal Sh generate position correction signal Shc.Shc exports to position control section 44 with the position correction signal.In position control section 44, position-based corrected signal Shc obtains the suitable speed of servomotor 16, generates motor speed control signal Sr2.Sr2 exports to speed comparing section 35 with the motor speed control signal.The flow direction of the signal that speed comparing section 35 is later is identical with pressure feedback control.
In addition,, also can make adjuster 31 sides have the function that controls to speed controlling portion 36, make amplifier 32 sides have the later function of electric current comparing section 37 at pad control part 30.
By the switching manipulation of switching part 45, switch pressure feedback control and position feedback control.In the present embodiment, under the situation of the 1st switching time that the detection patrix contacts with workpiece, switch to pressure feedback control from position feedback control, under the situation of the 2nd switching time that detects cushion pad 11 arrival bottom dead centres, switch to position feedback control from pressure feedback control.
The 1st switching time, be that the measured value of the measured value of deformeter 17 when the decline of the cushion pad 11 head 18b of (patrix contacts with workpiece, when beginning to produce the pressure of cushion pad 11) or linear movement pick-up 18 when reaching the 1st threshold value is when reaching the 1st assigned position (when cushion pad 11 reaches patrix and workpiece position contacting).The 2nd switching time, be when the decline of cushion pad 11, when the measured value of the head 18b of (patrix separates with workpiece, when the pressure of cushion pad 11 disappears) or linear movement pick-up 18 reached the 2nd assigned position when the measured value of deformeter 17 reached the 2nd threshold value (when cushion pad 11 reaches bottom dead centre).
Below, adopt Fig. 4, Fig. 5, the relation of the action of cushion pad 11 and pressure, position feedback control is described.
Fig. 5 is the diagram of the action of expression slide block and die-cushion, the variation of the position of expression time dependent slide block of companion and die-cushion.
On press, the impact when contacting with workpiece in order to relax patrix is carried out the preparation of cushion pad 11 and is quickened.Prepare acceleration from moment t1 to the t2., carry out position feedback control around here at pad control part 30, in the mode of the predefined location graphic of position finding value trace, the position of control cushion pad 11.Cushion pad 11 descends according to its result.
At moment t2 (the 1st switching time), patrix contacts with workpiece.At this moment, in the switching part 45 of pad control part 30, change-over switch.Switch to pressure feedback control from position feedback control.During from moment t2 to t3, slide block 2 and cushion pad 11 form one and descend the deep-draw processing work.At this moment, carry out pressure feedback control at pad control part 30, the mode of the predefined pressure figure of piezometry value trace, control imposes on the active force of cushion pad 11.Cushion pad 11 descends according to its result.
At moment t3 (the 2nd switching time), slide block 2 and cushion pad 11 arrive bottom dead centre.At this moment, at the switching part 45 of pad control part 30, change-over switch is switched to position feedback control from pressure feedback control.To the t4, slide block 2 and cushion pad 11 form one, the amount of the service hoisting that only rises from moment t3.To the t5, the cushion pad locking temporarily stops ascending motion from moment t4.Begin ascending motion once more at moment t5 cushion pad 11.More than, after the t3, carry out position feedback control constantly, the predefined location graphic of position finding value trace, the position of control cushion pad 11 at pad control part 30.Cushion pad 11 rises according to its result.
In addition, in the present embodiment, the pressure that is determined at cushion pad 11 generations promptly cushions pressure, carries out pressure feedback control, but carries out FEEDBACK CONTROL based on the active force that imposes on cushion pad 11, also belongs to a kind of of pressure feedback control.
According to the 1st embodiment, owing to control the timing of the pressure feedback control of cushion pad on demand, feed back the pressure feedback control of the closed loop that the buffering measured from the cushion pad body presses, therefore the buffering of cushion pad is pressed accurately.Thereby can improve the processability of forcing press.
, the present invention can be used in the multiple kinds of molds buffer.Press embodiment 2～embodiment 6 explanations part wherein below.
[embodiment 2]
Fig. 6 is the ideograph of the die-cushion of the 2nd embodiment.About die-cushion shown in Figure 6 50, the different part of explanation and die-cushion shown in Figure 2 10 only.
In die-cushion 50, cushion pad 11 is via ball screw 52, binding parts 55, big belt wheel 13, belt 14 and small pulley 15, with the rotating shaft binding of servomotor 16.Mutual transmission of power freely between cushion pad 11 and servomotor 16.The threaded shank 52b that links ball screw 52 in the bottom of cushion pad 11.The threaded shank 52b of ball screw 52 is screwed in the nut portions 52a.The bottom of threaded shank 52b is connected and links on the parts 55.Link parts 55, be supported on the crossbeam 6 by axles such as bearings, its underpart is attached on the big belt wheel 13.Small pulley 15 is attached on the rotating shaft of servomotor 16.Hang belt 14 on big belt wheel 13 and small pulley 15, mutual transmission of power freely.
If supply with electric current to servomotor 16, the rotating shaft rotation, small pulley 15, big belt wheel 13, binding parts 55, nut portions 52a just rotatablely move.Along with rotatablely moving of nut portions 52a, threaded shank 52b is lifting direction rectilinear motion along nut portions 52a at above-below direction.So, cushion pad 11 and together elevating movement of threaded shank 52b.By the electric current of control supply servomotor 16, control imposes on the active force of cushion pad 11 and promptly presses in the buffering that cushion pad 11 produces.
In die-cushion 50,, identical with the die-cushion 10 of the 1st embodiment about deformeter 17, linear movement pick-up 18, encoder 19, pad control part 30.In addition, at pad control part 30, carry out the FEEDBACK CONTROL identical with the FEEDBACK CONTROL of the 1st embodiment.
According to the 2nd embodiment, can access same effect with the 1st embodiment.
[embodiment 3]
Fig. 7 is the ideograph according to the die-cushion of the 3rd embodiment.Fig. 8 is the vertical view according to the die-cushion of the 3rd embodiment.About Fig. 7, die-cushion 60 shown in Figure 8, the different part of explanation and die-cushion shown in Figure 2 10 only.
Each side of cushion pad 11 and and the internal face of the lathe bed 9 of its each side subtend between linear servo-actuator 61 is set.Linear servo-actuator 61 is made of a pair of coil portion 61a and the 61b of magnet portion, on each side of cushion pad 11 coil portion 61a is set, and the 61b of magnet portion is set on the internal face of lathe bed 9.Also can in contrast the 61b of magnet portion be set on each side of cushion pad 11, coil portion 61a is set on the internal face of lathe bed 9.In addition, in Fig. 7, only on the internal face of the lathe bed 9 of the right flank of cushion pad 11 and subtend, linear servo-actuator 61 is shown.But, in fact as shown in Figure 8, can on the internal face of the lathe bed 9 of each side of cushion pad 11 and subtend, linear servo-actuator 61 be set.
When being provided with under the situation of coil portion 61a on the cushion pad 11, if coil portion 61a excitation just acts on gravitation and repulsive force between coil portion 61a and the 61b of magnet portion, coil portion 61a and cushion pad 11 are accepted the active force of lifting direction.When being provided with under the situation of the 61b of magnet portion on the cushion pad 11, if coil portion 61a excitation just acts on gravitation and repulsive force between coil portion 61a and the 61b of magnet portion, coil portion 61a and cushion pad 11 are accepted the active force of lifting direction.If the electric current of coil portion 61a is supplied with in control, just can control the active force that imposes on cushion pad 11 and promptly press in the buffering that cushion pad 11 produces.
The balancer 62 of the air pressure type that is made of piston and cylinder is set in the bottom of cushion pad 11.Though not shown, the piston of balancer 62 supports from the below by crossbeam 6.So,, therefore cut off the power supply of linear servo-actuator 61 because cushion pad 11 supports by crossbeam 6 via balancer 62, though coil portion 61a and the 61b of magnet portion between magnetic force disappear, cushion pad 11 can not fall downwards yet.
In die-cushion 60,, identical with the die-cushion 10 of the 1st embodiment about deformeter 17, linear movement pick-up 18, pad control part 30.
About FEEDBACK CONTROL, also the die-cushion 10 with the 1st embodiment is identical basically.But because the servomotor of revolving servomotor and Direct Action Type is structurally variant, so the feedback control system of motor speed is slightly different.This part only is described here.
Fig. 9 is the control block diagram of the FEEDBACK CONTROL of carrying out in the 3rd embodiment.
The speed of so-called linear servo-actuator 61 is meant the relative velocity of coil portion 61a with respect to the 61b of magnet portion, i.e. the rising or falling speed of cushion pad 11.By by time differential addendum modification (addendum modification is with respect to the derivative of time), obtain the rising or falling speed of cushion pad 11.Carry out differential based on the position signalling of being measured by head 18b, it is worth as feedback speed signal Svf, exports to speed comparing section 35.In speed comparing section 35, relatively the value of motor speed control signal Sv1 (being Sv2 when position feedback control) and the value of feedback speed signal Svf generate motor speed corrected signal Svc.Svc exports to speed controlling portion 36 with the motor speed corrected signal.At speed controlling portion 36, based on motor speed corrected signal Svc, obtain the suitable current value of supplying with servomotor 16, generate current controling signal Sc.Current controling signal Sc is exported to electric current comparing section 37.
In addition, pressure feedback control system is identical with the 1st embodiment with Current Feedback Control system.
According to the 3rd embodiment, can access same effect with the 1st embodiment.
In addition, according to the 3rd embodiment, the transmission of power between servomotor and the cushion pad is not that the machinery contact of the engaging member by adopting gear or belt or ball screw etc. is carried out, but is undertaken by the noncontact of adopting magnetic force.Therefore, the mechanical sounds during unpowered transmit can reduce the operating sound of press.
In addition, according to the 3rd embodiment, compare during with the revolving servomotor of employing, component count is few.Therefore be easy to the maintenance of die-cushion.
[embodiment 4]
Figure 10 is the ideograph according to the die-cushion of the 4th embodiment.About die-cushion shown in Figure 10 70, the different part of explanation and die-cushion shown in Figure 2 10 only.
In die-cushion 70, cushion pad 11 is via plunger rod 73, piston 74, ball screw 72, binding parts 75, big belt wheel 13, belt 14 and small pulley 15, with the rotating shaft binding of servomotor 16.Between cushion pad 11 and servomotor 16, mutual transmission of power freely.
The plunger rod 73 that connects column in the bottom of cushion pad 11.Plunger rod 73 is supported by drift guide 76 sliding freely along its side.Drift guide 76 is installed on the crossbeam 6 freely.If drift guide 76 is fixed on the crossbeam 6, Yi Bian plunger rod 73 just be supported on the drift guide 76, Yi Bian elevating movement.Drift guide 76 is to lifting direction pilot punch bar 73 and be attached at cushion pad 11 on the plunger rod 73.
Be formed on the cylinder 73a that following direction has opening in the bottom of plunger rod 73, accommodate piston 74 freely in the slides within of cylinder 73a.Top formation hydraulic chamber 77 with the internal face of cylinder 73a and piston 74.The axle center of hydraulic chamber 77, with the axle center of plunger rod 73 and ball screw 72 on coaxial.The pressure oil that relaxes usefulness is impacted in filling in hydraulic chamber 77.The pressure oil of hydraulic chamber 77 relaxes the impact that produces when patrix contacts with workpiece.
In addition, as shown in figure 11, also can be in hydraulic chamber 77 connecting pipeline 85, be used for to hydraulic chamber's 77 supply pressures oil and from hydraulic chamber's 77 discharge pressure oil.In hydraulic chamber 77,, connect Figure 12, Figure 14, oil hydraulic circuit shown in Figure 15 via pipeline 85.About the details of these oil hydraulic circuits, narration in embodiment 5.
The lower end of piston 74 is connected on the upper end of threaded shank 72b of ball screw 72.Form the concave surface 74a of dome shape in the lower end of piston 74, with the upper end of the threaded shank 72b of this concave surface 74a subtend, form the protuberance 72c of dome shape.On the contrary, also can form convex surface, form concave surface in the upper end of threaded shank 72b in the lower end of piston 78.Although it is strong that the such bar-like member of threaded shank 72b overcomes the ability of the axial power that acts on the end, overcome a little less than the ability of moment of flexure.If the upper end of threaded shank 72b is a spherical shape, if cushion pad 11 tilts, in the upper end of threaded shank 72b moment of flexure takes place, also only to the axial power of threaded shank 72b mass action.By structure so, can prevent the damage of the threaded shank 72b that eccentric load causes.
Between the nut portions 72a of ball screw 72 and big belt wheel 13, clamp and link parts 75, link parts 75 and be supported on the crossbeam 6 by axles such as bearings.On the rotating shaft of servomotor 16, link small pulley 15.Hang belt 14 on big belt wheel 13 and small pulley 15, mutual transmission of power freely.
If supply with electric current to servomotor 16, the rotating shaft rotation, then small pulley 15, big belt wheel 13 just rotatablely move.Because big belt wheel 13, binding parts 75 and nut portions 72a are one, so nut portions 72a together rotatablely moves with the rotation of big belt wheel 13, along with rotatablely moving of nut portions 72a, threaded shank 72b is rectilinear motion on the lifting direction along nut portions 72a at above-below direction.So, cushion pad 11 and threaded shank 72b, piston 74, together elevating movement of plunger rod 73.By the electric current of control supply servomotor 16, control imposes on the active force of cushion pad 11 and promptly presses in the buffering that cushion pad 11 produces.
In die-cushion 70,, identical with the die-cushion 10 of the 1st embodiment about deformeter 17, linear movement pick-up 18, encoder 19, pad control part 30.In addition, at pad control part 30, carry out the FEEDBACK CONTROL same with the FEEDBACK CONTROL of the 1st embodiment.
In addition, deformeter 17 also can: be not located at the side of cushion pad 11, and be located at the side of plunger rod 73.
According to the 4th embodiment, can access the effect identical with the 1st embodiment.
[embodiment 5]
About die-cushion shown in Figure 11 70, also can consider to be determined at the pressure that cushion pad 11 produces, and measure the pressure of hydraulic chamber 77 without deformeter 17.
Figure 12 is the oil hydraulic circuit figure of the 5th embodiment.Figure 13 is the control block diagram of the FEEDBACK CONTROL of carrying out in the 5th embodiment in addition.
The pressure oil outlet of oil pressure pump 83 via check valve 81 and pipeline 85, is communicated with the pressure hydraulic fluid port of hydraulic chamber 77.Connect branch line on the pipeline between oil pressure pump 83 and the check valve 81, this branch line is communicated with safety valve 82.Safety valve 82 is communicated with fuel tank 84 in addition.By safety valve 82, will be set in the pressure of regulation from the pressure oil that oil pressure pump 83 is discharged, remaining pressure oil turns back to fuel tank 84.In addition, by check valve 81, the pressure oscillation in the hydraulic chamber 77 can directly not influence oil pressure pump 83.
Connect branch line on pipeline 85, this branch line is communicated with safety valve 93.In addition, safety valve 93 is communicated with fuel tank 84.Safety valve 93 presses setting to be used to prevent the maximum oil pressure of overload as safety.If the oil pressure in the hydraulic chamber 77 reaches maximum oil pressure, just open the safety-valve 93, the pressure oil in the pipeline 85 just turns back to fuel tank 84 via safety valve 93.So the oil pressure in the hydraulic chamber 77 reduces.If the measured value of pressure sensor 86 drops to below the regulation pressure, not shown adjuster just promptly stops press.Thereby the pressure oil by in fuel tank 84 discharge lines 85 prevents overload.
Figure 14 is the oil hydraulic circuit figure of the another way of the 5th embodiment.
As shown in figure 14, also can: replace the safety valve 93 of Figure 12, directional control valve 88 be set.Usually, directional control valve 88 is located at the guiding valve of self inside or lift valve etc. by elastic force pushing, cuts off pipeline 85 and fuel tank 84.Measured value at pressure sensor 86 surpasses under the situation of regulation pressure, might overload.The measured value of pressure sensor 86 is exported to pressure control part 87, surpass in measured value under the situation of regulation pressure, pressure control part 87 is to directional control valve 88 output safety signals.Directional control valve 88 excitations of input safety signal are located at the coil of himself inside.If the pushing force that the propulsive force that magnetic force forms forms greater than elastic force, guiding valve or lift valve etc. just move.Switching direction control valve 88, connecting pipeline 58 and fuel tank 84 like this.So the pressure oil in the pipeline 85 via directional control valve 88, turns back to fuel tank 84.The adjuster output washout of the press that pressure control part 87 and safety signal one are not shown in the same way.Adjuster, the washout according to input promptly stops press.So prevent overload.
Figure 15 also is the oil hydraulic circuit figure according to the another way of the 5th embodiment.
As shown in figure 15, also can: replace the safety valve 93 of Figure 12, protective valve 95 be set.Protective valve 95 has the 95a of grease chamber of path and the air chamber 95b in big footpath, also has by path piston freely and the piston 95c that slip big footpath piston freely constitutes in air chamber 95b of sliding in the 95a of grease chamber.Pipeline 58 is communicated with the 95a of grease chamber.Air chamber 95b via directional control valve 96, check valve 97 and regulator 98, is communicated with air potential source 99.In the side of the 95a of grease chamber the oil pressure mouth is set.The oil pressure mouth is communicated with fuel tank 84.
Oil pressure in pipeline 85 is to be used to prevent that piston 95c is for balance under the situation of maximum oil pressure of overload, and by regulator 98, the air in the 95b of setting air chamber is pressed.If promptly the oil pressure in the pipeline 85 reaches more than the maximum oil pressure, piston 95c is just to air chamber 95b side shifting.By moving of piston 95c, pipeline 85 is communicated with fuel tank 84.So the pressure oil in the pipeline 85 turns back to fuel tank 84 via protective valve 95.If piston 95c to air chamber 95b side shifting, just detects moving of piston 95c near switch, to the adjuster output washout of not shown press.Adjuster, the washout according to input promptly stops press.So prevent overload.
Usually, directional control valve 96 is located at the guiding valve of self inside or lift valve etc., connecting pipeline 85 and fuel tank 84 by elastic force pushing.If the solenoid coil of directional control valve 96 inside by excitation, just produces the propulsive force that is formed by magnetic force in guiding valve or lift valve etc.If the pushing force that the propulsive force that magnetic force forms forms greater than elastic force, guiding valve or lift valve etc. just move.Like this switching direction control valve 96, the air in the air chamber 95b is emitted to atmosphere via silencer 90.So the oil in the hydraulic chamber 77 turns back to fuel tank 84.Mainly when safeguarding, carry out so operation of directional control valve 96.
According to the 5th embodiment, can access the effect identical with the 1st embodiment.
[embodiment 6]
In each embodiment, single die-cushion has been described, but also can on 1 processing stations of press, a plurality of die-cushions be set.In such cases, preferred, by the position relation of following formation cushion pad and its driving mechanism.About its position relation, with die-cushion shown in Figure 16 70 ' be the example explanation.
Figure 16 is the diagram of the position relation of explanation cushion pad and driving mechanism thereof.
The 1st projection image 91 when at first, imagination is from the vertical direction horizontal plane projection downwards of cushion pad 11.Equally, imagine the vertical direction that is positioned at the driving mechanism of cushion pad 11 belows from plunger rod 73, drift guide 76, ball screw 72 and servomotor 16 etc., the 2nd projection image 92 during horizontal plane projection downwards.And, be included in mode in the 1st projection image 91, configuration cushion pad 11 and driving mechanism thereof with whole the 2nd projection image 92.By configuration like this, die-cushion 70 ' the space that is provided with of horizontal direction can be greater than the top area of cushion pad 11.That is, even be adjacent to be provided with cushion pad 11 mutually, also can not interfere each cushion pad 11 the bottom driving mechanism to each other, can 1 processing stations be provided with in abutting connection with ground a plurality of die-cushions 70 '.
In addition, in Figure 16, the projection image below the trend of purchasing of servomotor 16, belt 14 and small pulley 15 is positioned under the situation outside the 1st projection image 91, by making the height difference of belt 14, or dispose servomotor 16 on the contrary, also can closely be provided with the die-cushion 70 of adjacency '.Thus, can dwindle more each die-cushion 70 ' the area of cushion pad 11, be easy to dispose die-cushion 70 ', increase the free degree of configuration simultaneously.
Figure 17 A～Figure 17 D is the vertical view of 1 processing stations.In Figure 17 A, 1 processing stations of press be provided with 1 die-cushion 70 ', in Figure 17 B, 1 processing stations of press be provided with two die-cushions 70 ', in Figure 17 C, 1 processing stations of press be provided with 4 die-cushions 70 ', in Figure 17 D, 1 processing stations of press be provided with 8 die-cushions 70 '.
Control independently each die-cushion 70 '.Thereby the buffering that can change in 1 processing stations is pressed.Also can make each die-cushion 70 ' interlock in addition.
If 1 cushion pad with a plurality of driving mechanisms relatively is set on 1 processing stations, situation when controlling the action of this cushion pad, has the cushion pad of 1 driving mechanism with a plurality of settings on 1 processing stations, situation when controlling the action of cushion pad respectively, because the latter separates cushion pad, its independent controlled height thus.
In the present embodiment, be located at 1 die-cushion on the processing stations as a plurality of, with the equal die-cushion 70 of die-cushion shown in Figure 10 70 ' be that example is illustrated.But also can be with the equal die-cushion of die-cushion 10 shown in Figure 2 or die-cushion 50 shown in Figure 6 or die-cushion shown in Figure 7 70.But the guiding parts of each die-cushion of guiding need be set in this case, in the subtend side of the cushion pad 11 that adjoins each other.For die- cushion 10,50,60, be drift guide 76 because cushion pad 70 (70 ') itself has guiding parts, so the mutual guiding parts of guiding need be set on cushion pad 11.
According to the 6th embodiment, can access the effect same with the 1st embodiment.
In addition, according to the 6th embodiment, press owing to can partly change the interior buffering of 1 processing stations, thereby can improve the precision of press more.
Claims (5)
1. die buffer control device, the action that it is used to control cushion pad is characterized in that, has:
The pad driving mechanism drives the cushion pad lifting while it applies active force upwards;
Position finding mechanism, it measures the position of cushion pad;
Mechanism is measured in load, and it is used to be determined at the load that cushion pad produces;
Opportunity testing agency, it is used to detect occurrence time and disappearance opportunity of described load;
Controlling organization, it controls described pad driving mechanism,
Described controlling organization carries out Position Control and load control, and described Position Control is to measure the position of cushion pad, so that the mode of the predefined location graphic of position finding value trace is controlled the position of cushion pad; Described load control is to be determined at the load that cushion pad produces, and is controlled at the load that cushion pad produces so that the load measured value is followed the trail of the mode of predefined load figure,
And described controlling organization is accompanied by the occurrence time by described testing agency's detection load on opportunity, switches to load control from Position Control; Be accompanied by disappearance opportunity, switch to Position Control from load control by described testing agency's detection load on opportunity.
2. die buffer control device as claimed in claim 1 is characterized in that:
Described load is measured mechanism and is had deformeter, the distortion that is used to measure described cushion pad or supports the supporter of described cushion pad;
Utilize the measurement result of deformeter, obtain the value that is equivalent to load.
3. die buffer control device as claimed in claim 1 is characterized in that:
Described load is measured mechanism and is had: the pressure sensor that is installed in the hydraulic chamber between described cushion pad and the described pad driving mechanism and measures the pressure in the hydraulic chamber;
Utilize the measurement result of pressure sensor to obtain the value that is equivalent to load.
4. die buffer control device as claimed in claim 1 is characterized in that:
Have a plurality of described cushion pads, a plurality of described pad driving mechanism, a plurality of described load at 1 processing stations of press and measure mechanism, a plurality of described controlling organization, and the action of independent each cushion pad of control.
5. die buffer control method, the action that it is used to control cushion pad is characterized in that,
Comprise:
The Position Control operation is measured the position of cushion pad, controls the position of cushion pad in the mode of the predefined location graphic of position finding value trace; And
Load control operation is determined at the load that cushion pad produces, and the mode of following the trail of predefined load figure with the load measured value is controlled at the load that cushion pad produces;
Switch to described load control operation from described Position Control operation the opportunity that begins to produce load at cushion pad,
Switch to described Position Control operation from described load control operation the opportunity that the load that produces at cushion pad disappears.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004175581 | 2004-06-14 | ||
| JP2004175581 | 2004-06-14 | ||
| JP2005168519 | 2005-06-08 |
Publications (2)
| Publication Number | Publication Date |
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| CN1714961A CN1714961A (en) | 2006-01-04 |
| CN100509198C true CN100509198C (en) | 2009-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100780470A Active CN100509198C (en) | 2004-06-14 | 2005-06-14 | Die cushion control device and die cushion control method |
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| CN (1) | CN100509198C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006122944A (en) * | 2004-10-28 | 2006-05-18 | Fanuc Ltd | Die cushion control device |
| JP4986112B2 (en) * | 2006-02-27 | 2012-07-25 | 株式会社Ｉｈｉ | Cushion load control device and press machine equipped with cushion load control device |
| JP4787642B2 (en) * | 2006-03-22 | 2011-10-05 | コマツ産機株式会社 | Die cushion control device for press machine |
| US8348249B2 (en) * | 2008-10-07 | 2013-01-08 | Dadco, Inc. | Reaction device for forming equipment |
| CN103648674B (en) * | 2012-03-29 | 2015-06-17 | 株式会社Ihi | Die cushion control device |
| JP5680121B2 (en) * | 2013-01-24 | 2015-03-04 | アイダエンジニアリング株式会社 | Die cushion device and die cushion control method for press machine |
| FR3061863B1 (en) * | 2017-01-18 | 2019-05-24 | Adm28 S.Ar.L | MAGNETOFORMING PADDING DEVICE AND ASSOCIATED METHOD |
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