CN106424278A - Electrohydraulically-controlled pressure machine with return stroke pressure retaining function - Google Patents
Electrohydraulically-controlled pressure machine with return stroke pressure retaining function Download PDFInfo
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- CN106424278A CN106424278A CN201611036751.4A CN201611036751A CN106424278A CN 106424278 A CN106424278 A CN 106424278A CN 201611036751 A CN201611036751 A CN 201611036751A CN 106424278 A CN106424278 A CN 106424278A
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- Prior art keywords
- control
- chamber
- pressure
- punch rod
- fluid pressure
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
- B30B15/18—Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram
- B30B15/186—Controlling the return movement of the ram, e.g. decompression valves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
- B30B15/18—Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram
- B30B15/20—Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram controlling the speed of the ram, e.g. the speed of the approach, pressing or return strokes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
- B30B15/22—Control arrangements for fluid-driven presses controlling the degree of pressure applied by the ram during the pressing stroke
Abstract
The invention discloses an electrohydraulically-controlled pressure machine with a return stroke pressure retaining function. The electrohydraulically-controlled pressure machine with the return stroke pressure retaining function comprises an executing mechanism and a hydraulic control mechanism, wherein the hydraulic control mechanism comprises a first hydraulic pipe, a second hydraulic pipe, a third hydraulic pipe, a pressure reducing valve, a first control unit, a pressurizing mechanism, a second control unit, a magnetic force control mechanism and a return stroke pressure retaining mechanism. Through matching of the pressurizing mechanism and the magnetic force control mechanism in the hydraulic control mechanism, when a stamping rod enters a third stroke section to cause elastoplastic deformation of a workpiece, the pressure increases ceaselessly, so that a requirement on a gradually increasing pressure during the elastoplastic deformation of the workpiece is met, and thus the stamped workpiece has relatively good stiffness. The return stroke pressure retaining mechanism is arranged on an oil returning pipe of the hydraulic control mechanism, the return stroke pressure retaining mechanism endows a right chamber with a certain pressure, and the pressure enables the returning speed of the stamping rod stable, so that the stamping rod does not impact an executing oil cylinder in a return stroke.
Description
Technical field
The present invention relates to electro-mechanical arts, more particularly, to a kind of electrichydraulic control press with backhaul pressure holding function.
Background technology
In prior art, workpiece is carried out with punching press and generally utilizes two kinds of power form, one is as dynamic using machine driving
Power, i.e. machine power；Two is as power, i.e. hydraulic power using hydraulic drive.Generally, reduce when workpiece deforms, and workpiece
Elastoplasticity modulus less, workpiece deformation desirable pressure less when, more suitable using machine power, because machine power makes
The punching press action obtaining punch rod is very fast.When workpiece deformation is larger, and the elastoplasticity modulus of workpiece is larger, and workpiece deforms desirable pressure
When larger, more suitable using hydraulic power, because hydraulic power can provide larger pressure such that it is able to make workpiece become
Shape is to final preset shape, and the mechanical property of the workpiece after punching press is preferable.
Engineers and technicians thought in the past, and during workpiece Pressing Deformation, workpiece need be only limited by constant stamping press and is
Can complete to be molded, however, applicant finds, in punching press after utilizing elastic plastic theory analysis and summary in substantial amounts of shock pressure experiments
Cheng Zhong, workpiece has the deformation in two stages, i.e. the simple elastic deformation of starting stage and the elastoplasticity to after final molding
Mixed deformation, in the deformation process of starting stage, constant pressure can so that workpiece occurs constant deformation, and be worked as follow-up
The elastic-plastic deformation stage, need gradual supercharging that workpiece just can be made to continue deformation, thus final molding.In order that workpiece can
Final molding, actual pressure punch rod being disposed above all the time to the pressure of workpiece needed for elastic-plastic deformation of engineers and technicians
Power, and make this pressure keep constant (because engineers and technicians think that whole deformation pressure process is constant), thus ability
Make workpiece punch forming, so that workpiece is in the elastic deformation of starting stage, the pressure being subject to is much larger than desirable pressure, so
And, this higher constant pressure makes the deformation in this stage very fast, thus leading to this stage to be unable to homogeneous deformation, can not in this stage
Homogeneous deformation leads to shaping workpiece mechanical property poor, as poor in rigidity, or punching press failure.
Because technical staff thinks that stamped workpieces only need higher constant pressure, therefore, engineers and technicians are setting
Meter or during from mechanically or hydraulically power, only need to make punch rod keep constant higher forced feed.Therefore, existing skill
The hydraulic system for driving punch rod in art can only provide constant pressure to punch rod, according to the foregoing description of applicant
Understand, the workpiece mechanics being stamped out using this hydraulic system is poor.
According to the foregoing description of applicant, punch rod should have three trip segment carrying out punching course, and that is, punch rod is entered
To elastic deformation trip segment (the second stroke making workpiece elastic deformation to the idle stroke section (the first trip segment) of workpiece, punch rod
Section) and punch rod make workpiece that elastic-plastic deformation final stamping forming elastic-plastic deformation trip segment (third trip to occur
Section).
Additionally, the hydraulic system being used for punching press in prior art also has the disadvantages that：
1st, the backhaul of punch rod controls complexity, and backhaul reaction is not sensitiveer.
2nd, during punch rod backhaul, opening speed is unstable, causes each return interval different.
3rd, the first stage of punch rod and second stage feed speed are unstable, and pressure change response is slower.
Content of the invention
For above-mentioned technical problem present in existing technology, the implementing of the present invention provides one kind and can solve the problem that above-mentioned one
The electrichydraulic control press with backhaul pressure holding function of individual or Railway Project.
For solving above-mentioned technical problem, the technical solution used in the present invention is：
A kind of electrichydraulic control press with backhaul pressure holding function, for stamped workpieces, including executing agency and
There is provided pressure for described executing agency and control the hydraulic control of described executing agency；Wherein：
Described executing agency includes executing cylinder body, be arranged in described execution cylinder body and described execution cylinder body being divided into left chamber
The execution piston of room and right chamber room and be connected with described execution piston and stretch out from described left chamber for stamped workpieces
Punch rod, described punch rod have be fed to the first trip segment of absorption surface, by workpiece punching press to initial deformation state
Second trip segment and by stamping forming for workpiece third trip section；
Hydraulic control includes：
First, second and third fluid pressure line, three is all connected with hydraulic system；
Pressure-reducing valve, it is arranged on the first fluid pressure line；
First control unit, its according to the trip segment of described punch rod control the first fluid pressure line and the second fluid pressure line with
The break-make of described right chamber room, so that when described punch rod feeds in the first trip segment, described first fluid pressure line passes through first
Connecting pipeline and described right chamber, when described punch rod is fed to the second trip segment from described first trip segment, described
Second fluid pressure line passes through the first connecting pipeline and described right chamber；
Booster body, it includes reducing plunger shaft, in the diameter segment that is arranged on described reducing plunger shaft first lives
Plug, be arranged in the larger-diameter section of described reducing plunger shaft second piston and connect described first piston and described the
The connecting rod of two pistons, wherein, reducing plunger shaft is divided into path chamber, big footpath chamber by described first piston and described second piston
Room and middle part chamber, described 3rd fluid pressure line leads to described big footpath chamber, and described path chamber passes through the second connecting pipeline
With described right chamber；
Second control unit, it is arranged on described 3rd fluid pressure line, and described second control unit is according to described punching press
The trip segment of bar controls the break-make of described 3rd fluid pressure line, so that when described punch rod is fed to the third line from the second trip segment
During journey section, described 3rd fluid pressure line conducting；
Magnetic Control mechanism, it includes being arranged on described middle part within the chamber two electromagnetism for pushing against described second piston
Iron, it is arranged on described execution cylinder body and for obtaining the displacement transducer of trip segment of described punch rod and according to institute's rheme
The controller of the size of magnetic repulsion of feeding Process flowchart two electromagnet of the third trip section acquired in displacement sensor, so that work as
After described punch rod is fed to third trip section, described controller controls the magnetic repulsion between electromagnet described in two so that magnetic repulsion
Reduce with the feeding process of described punch rod, so that pressure the entering with described punch rod of the hydraulic oil of described path within the chamber
Feed journey raises from the pressure value of the hydraulic oil indoor equal to left chamber；
Backhaul pressure-keeping mechanism, it is used for when described punch rod is by workpiece punch forming backhaul, described backhaul pressure-keeping mechanism
Described right chamber room is made to have predetermined pressure.
Preferably, described first control unit is hydraulicchange-over valve, and the valve element of described hydraulicchange-over valve has makes described the
One fluid pressure line passes through the first connecting pipeline makes described second fluid pressure line with described right chamber room break with described right chamber room and simultaneously
The primary importance opened and make described second fluid pressure line connect the first connecting pipeline to make institute with described right chamber and simultaneously
State the second place that the first fluid pressure line is disconnected with described right chamber room；The valve element of described hydraulicchange-over valve pass through respectively with a described left side
First control piper of chamber and with the control of the second control piper of described right chamber in primary importance and second
Switch between position, so that when described punch rod is fed to the second trip segment from the first trip segment, described hydraulicchange-over valve
Valve element switches to the second place by primary importance.
Preferably, described second control unit is Mechanical Driven reversal valve, and the valve element of described Mechanical Driven reversal valve has
Make the primary importance of the 3rd fluid pressure line conducting and the second place making described 3rd fluid pressure line disconnection, described have backhaul
The electrichydraulic control press of pressure holding function also includes trigger mechanism, and described trigger mechanism includes and described Mechanical Driven reversal valve
The valve element push rod that connects and stretch out towards described punch rod direction and be arranged on the first protuberance in described punch rod, described
First protuberance extends the distance of third trip section in the direction of feed of described punch rod, with when described punch rod is from the second row
When journey section is fed to third trip section, described first protuberance pushes against described push rod so that described push rod drives described Mechanical Driven
The valve element of reversal valve switches to primary importance from the second place.
Preferably, described backhaul pressure-keeping mechanism includes pressurize cylinder body, the pressurize piston being arranged in described pressurize cylinder body, institute
State pressurize piston and described pressurize cylinder body is become left pressurize chamber and right pressurize chamber respectively, described right pressurize within the chamber is provided with guarantor
Pressing spring, described right pressurize chamber is connected with fuel tank by a check valve being set with predetermined conducting pressure, and described have backhaul
The electrichydraulic control press of pressure holding function also include the 3rd control unit that trigger switch electrically connected with described trigger switch and
4th control unit, described piston is additionally provided with the backhaul control bar stretching out described right chamber room, described backhaul control bar sets
It is equipped with the second protuberance for triggering described trigger switch, described 3rd control unit is arranged on described first connecting pipeline
On, described three control units have the first state making described first connecting pipeline conducting and so that described first connecting pipeline is broken
Opening and the second state of making described right chamber room pass through the 4th connecting pipeline and described left pressurize chamber, described 4th control
Unit is arranged on described first control piper, and described 4th control unit has makes the first of described first control piper conducting
State and make the second state that described first control piper disconnects, when described punch rod completes third trip section, described the
Two protuberances trigger described trigger switch so that described 3rd control unit switches to the second state by its first state, make described
4th control unit switches to the second state by first state；Described first fluid pressure line passes through third connecting pipe and a described left side
Chamber.
Preferably, described 3rd control unit and described 4th control unit are solenoid directional control valve.
Compared with prior art, the beneficial effect of the electrichydraulic control press with backhaul pressure holding function of the present invention
It is：Setting booster body and Magnetic Control mechanism in hydraulic control, this booster body and the cooperation of Magnetic Control mechanism make
Obtain punch rod and enter third trip section so that when workpiece occurs elastic-plastic deformation, pressure constantly raises, thus meet workpiece existing
Requirement during elastic-plastic deformation, pressure being gradually increased, because the hydraulic control of the present invention makes punch rod meet three row
The change of journey section pressure, so that the workpiece stiffness stamping out is preferably, and the scrappage of stamped workpieces is relatively low.In hydraulic control
Backhaul pressure-keeping mechanism is provided with the return line of mechanism, this backhaul pressure-keeping mechanism makes right chamber room have certain pressure, this pressure
Power makes the opening speed of punch rod stable, so that will not produce impact to execution oil cylinder during punch rod backhaul.
Brief description
Fig. 1 is the structural representation of the electrichydraulic control press with backhaul pressure holding function of the present invention.
In figure：
1- first fluid pressure line；2- second fluid pressure line；3- the 3rd fluid pressure line；4- first connecting pipeline；5- second is even
Siphunculus road；6- pressure-reducing valve；7- first control piper；8- second control piper；9- third connecting pipe；10- first control unit；
11- second control unit；12- the 3rd control unit；13- the 4th control unit；14- first piston；15- second piston；16- is even
Bar；17- path chamber；18- big footpath chamber；Chamber in the middle part of 19-；20- executes cylinder body；21- executes piston；22- punch rod；23-
Backhaul control bar；24- left chamber；25- right chamber room；26- controller；27- displacement transducer；28- first protuberance；29- push rod；
30- electromagnet；31- second protuberance；32- trigger switch；33- fuel tank；34- check valve；35- pressurize cylinder body；36- pressurize is lived
Plug；37- left pressurize chamber；38- right pressurize chamber；39- pressurize spring；40- the 4th connecting pipeline.
Specific embodiment
For making those skilled in the art be better understood from technical scheme, below in conjunction with the accompanying drawings and specific embodiment party
Formula elaborates to the present invention.
Introduce the present invention there is the electrichydraulic control press of backhaul pressure holding function before, introduce the workpiece that is stamped first
The process of Pressing Deformation, and the punch rod 22 (or claiming pressure head) of stamped workpieces whole punching course several trip segment so that
Deep enough can understand technical scheme and friendship effect.
Tradition thinks, it is plastic that workpiece needs by enough and constant pressure, however, workpiece is in practical distortion
In, the deformation desirable pressure with different phase is different.From the two kinds of deformation of experience altogether of blank to shaping, one is the starting stage to workpiece
Simple elastic deformation, now, the enough constant pressure of 22 need of punch rod can make workpiece carry out elastic deformation；Two are
Elastoplasticity mixed deformation, both there is elastic deformation in this stage has presence plastic deformation, and now, punch rod 22 is in the colleague of feeding
Need to be gradually increased pressure, so that workpiece final molding.
From the foregoing, it will be observed that needing there is three trip segment in punching course for punch rod 22, that is, punch rod 22 is fed to work
The idle stroke section (the first trip segment) of part, punch rod 22 make the elastic deformation trip segment (the second trip segment) of workpiece elastic deformation with
And punch rod 22 makes workpiece that elastic-plastic deformation final stamping forming elastic-plastic deformation trip segment (third trip section) to occur.
In the first trip segment, actuating unit (can be machine power or hydraulic power) only need to provide motion for punch rod 22
, in the second trip segment, actuating unit will provide certain constant pressure for punch rod 22 so that workpiece elastic deformation,
Third trip section, actuating unit will provide the pressure of start bit second trip segment for punch rod 22, and the feeding with punch rod 22
The pressure that pressure gradually rises, so that elastic-plastic deformation realized by workpiece.
The present invention is based on foregoing description, there is provided one kind enables punch rod 22 can provide corresponding pressure in three trip segment
The electrichydraulic control press with backhaul pressure holding function of power
As shown in figure 1, embodiment of the invention discloses that a kind of electrichydraulic control press with backhaul pressure holding function,
For stamped workpieces, provide pressure including executing agency and for executing agency and control the hydraulic control of executing agency；
Wherein：Executing agency includes executing cylinder body 20, be arranged in execution cylinder body 20 and execution cylinder body 20 being divided into left chamber 24 and the right side
The execution piston 21 of chamber 25 and the punch rod for stamped workpieces being connected with execution piston 21 and stretching out from left chamber 24
22, punch rod 22 have be fed to the first trip segment of absorption surface, by the second row of workpiece punching press to initial deformation state
Journey section and by stamping forming for workpiece third trip section；Hydraulic control includes：First, second and third fluid pressure line, San Zhejun
It is connected with hydraulic system；Pressure-reducing valve 6, it is arranged on the first fluid pressure line 1；First control unit 10, it is according to punch rod 22
Trip segment control the break-make of the first fluid pressure line 1 and the second fluid pressure line 2 and right chamber room 25, so that when punch rod 22 is first
During trip segment feeding, the first fluid pressure line 1 is connected with right chamber room 25 by the first connecting pipeline 4, when punch rod 22 is from the first row
When journey section is fed to the second trip segment, the second fluid pressure line 2 is connected with right chamber room 25 by the first connecting pipeline 4；Booster body,
It includes reducing plunger shaft, be arranged on reducing plunger shaft the first piston 14 in diameter segment, it is arranged on reducing plunger shaft
Larger-diameter section in second piston 15 and the connecting rod 16 connecting first piston 14 and second piston 15, wherein, first
Reducing plunger shaft is divided into path chamber 17, big footpath chamber 18 and middle part chamber 19 by piston 14 and second piston 15, and the 3rd
Fluid pressure line 3 leads to big footpath chamber 18, and path chamber 17 is connected with right chamber room 25 by the second connecting pipeline 5；Second controls list
Unit 11, it is arranged on the 3rd fluid pressure line 3, and the second control unit 11 controls the 3rd hydraulic tube according to the trip segment of punch rod 22
The break-make on road 3, so that when punch rod 22 is fed to third trip section from the second trip segment, the 3rd fluid pressure line 3 turns on；Magnetic force
Controlling organization, it includes being arranged in middle part chamber 19 and for pushing against two electromagnet 30 of second piston 15, being arranged on execution
On cylinder body 20 and for obtaining the displacement transducer 27 of trip segment of punch rod 22 and according to acquired in displacement transducer 27
The controller 26 of the size of magnetic repulsion of feeding Process flowchart two electromagnet 30 of third trip section, so that when punch rod 22 feeds
To third trip section, controller 26 control two electromagnet 30 between magnetic repulsion so that magnetic repulsion with punch rod 22 enter feed
Journey and reduce so that the pressure of the hydraulic oil in path chamber 17 with punch rod 22 feeding process from equal in left chamber 24
The pressure value of hydraulic oil rises and raises；Backhaul pressure-keeping mechanism, it is used for when punch rod 22 is by workpiece punch forming backhaul, backhaul
Pressure-keeping mechanism makes right chamber room 25 have predetermined pressure.
As shown in figure 1, in a preferred embodiment of the invention, the first control unit 10 is hydraulicchange-over valve, surges
The valve element of reversal valve has makes the first fluid pressure line 1 pass through the first connecting pipeline 4 and right chamber room 25 and make the second hydraulic tube simultaneously
Primary importance that road 2 is disconnected with right chamber room 25 and make the second fluid pressure line 2 connect the first connecting pipeline 4 to connect with right chamber room 25
And make the second place of the first fluid pressure line 1 and right chamber room 25 disconnection simultaneously；The valve element of hydraulicchange-over valve pass through respectively with left chamber
The control of the first control piper 7 of room 24 connection and the second control piper 8 connecting with right chamber room 25 is in primary importance and second
Switch between position so that when punch rod 22 is fed to the second trip segment from the first trip segment, the valve element of hydraulicchange-over valve by
Primary importance switches to the second place.
As shown in figure 1, in a preferred embodiment of the invention, the second control unit 11 is Mechanical Driven reversal valve,
The valve element of Mechanical Driven reversal valve has the primary importance making the 3rd fluid pressure line 3 conducting and so that the 3rd fluid pressure line 3 is disconnected
The second place, the electrichydraulic control press with backhaul pressure holding function also includes trigger mechanism, and trigger mechanism includes and machine
Tool drives the push rod 29 that the valve element of reversal valve connects and stretch out towards punch rod 22 direction and is arranged in punch rod 22 first
Protuberance 28, the first protuberance 28 extends the distance of third trip section in the direction of feed of punch rod 22, with when punch rod 22
When the second trip segment is fed to third trip section, the first protuberance 28 pushing and pressing push rod 29 is so that the driving of push rod 29 driving mechanical is changed
Switch to primary importance to the valve element of valve from the second place.
As shown in figure 1, in a preferred embodiment of the invention, backhaul pressure-keeping mechanism includes pressurize cylinder body 35, setting
Pressurize piston 36 in pressurize cylinder body 35, pressurize cylinder body 35 is become left pressurize chamber 37 and right pressurize chamber by pressurize piston 36 respectively
Room 38, is provided with pressurize spring 39 in right pressurize chamber 38, right pressurize chamber 38 is by a list being set with predetermined conducting pressure
It is connected to valve 34 with fuel tank 33, the electrichydraulic control press with backhaul pressure holding function also includes trigger switch 32 and triggering
3rd control unit 12 of switch 32 electrical connection and the 4th control unit 13, piston is additionally provided with the backhaul stretching out right chamber room 25
Control bar 23, backhaul control bar 23 is provided with the second protuberance 31 for triggering trigger switch 32, the 3rd control unit 12
It is arranged on the first connecting pipeline 4, the 3rd control unit 12 has to be made first state that the first connecting pipeline 4 turns on and make the
It is that a connecting pipe road 4 disconnects and make the second state that right chamber room 25 connected with left pressurize chamber 37 by the 4th connecting pipeline 40,
4th control unit 13 is arranged on the first control piper 7, and the 4th control unit 13 has make that the first control piper 7 turns on the
One state and the second state making the first control piper 7 disconnection, when punch rod 22 completes third trip section, the second protuberance
31 triggering trigger switch 32, so that the 3rd control unit 12 switches to the second state by its first state, make the 4th control unit 13
Second state is switched to by first state；First fluid pressure line 1 is connected with left chamber 24 by third connecting pipe 9.
Wherein, the predetermined conducting pressure of check valve 34 refers to, when punch rod 22 backhaul, the pressure rise of right chamber room 25 is arrived
When pressurize spring 39 is fully compressed, pressure in right chamber room 25 and left pressurize chamber 37, namely check valve 34 open pressure.
As shown in figure 1, in a preferred embodiment of the invention, the 3rd control unit 12 and the 4th control unit 13 are equal
For solenoid directional control valve.
Understand technical scheme and beneficial effect for convenience, the present invention is described below has backhaul pressurize
The electrichydraulic control press course of work of function.
Before introducing the electrichydraulic control press course of work with backhaul pressure holding function, introduce this first
The supercharging principle of the booster body in the bright electrichydraulic control press with backhaul pressure holding function.
If first piston 14 and second piston 15 are subject to the thrusts of hydraulic oil and stress balance, the liquid in path chamber 17
Press oil the thrust that the thrust to first piston 14 should be equal to the hydraulic oil in big footpath chamber 18 to second piston 15, i.e. P1S1=
(wherein, P1 is the pressure of the hydraulic oil in path chamber 17 to P2S2, and P2 is the pressure of the hydraulic oil in big footpath chamber 18, and S1 is
The area of section of first piston 14；S2 is the area of section of second piston 15), the area of section S2 due to second piston 15 is more than
The area of section S1 of first piston 14, so that the pressure P1 of the hydraulic oil in path chamber 17 is more than the liquid in big footpath chamber 18
The pressure P1 of force feed, therefore, after hydraulic oil enters big footpath chamber 18 of booster body, when the hydraulic oil of path chamber 17 conveying
Pressure be more than the pressure of the hydraulic oil in big footpath chamber 18, specific size relation and first piston 14 is cut with second piston 15
Face area is than relevant.
Should explain：Before the pressure change relation of above-mentioned booster body is built upon the thrust that piston is only subject to hydraulic oil
Put and draw.
As shown in figure 1, the electrichydraulic control press with backhaul pressure holding function of the present invention for stamped workpieces
Executive component is punch rod 22, and hydraulic control is used for providing power for punch rod 22 and making stamping parts in above three stroke
In section, corresponding pressure is applied to workpiece, and be additionally operable to control the backhaul of punch rod 22.
After hydraulic system starts fuel feeding, punch rod 22 starts near workpiece and contacts workpiece, now, as the first control
The valve element of the hydraulicchange-over valve of unit 10 is in primary importance, and the first fluid pressure line 1 reduces after pressure through surging through pressure-reducing valve 6
Reversal valve (as the first control unit 10), enters the first connecting pipeline 4, enters right chamber room 25 after the first connecting pipeline 4,
Because pressure itself is relatively low behind hydraulic oil entrance right chamber room 25, thus only providing feed motion (certainly, also can work together for punch rod 22
There is provided the less power of pressure), so that punch rod 22 constantly feed and then and absorption surface, when punch rod 22 and absorption surface
Afterwards, workpiece produces reaction force to punch rod 22 and passes to counter-force and execute work to resist the elastic deformation of workpiece, punch rod 22
Plug 21, so that the pressure of the hydraulic oil in right chamber room 25 increases, the pressure of this increase is transferred to liquid by the second control piper 8
The right-hand member of the valve element of dynamic reversal valve (as the first control unit 10), thus drive hydraulicchange-over valve (as the first control unit
10) valve element switches to the second place from primary importance.
After punch rod 22 contact workpiece, punch rod 22 initially enters the second trip segment, now, hydraulicchange-over valve (first
Control unit 10) valve element switch to the second place from primary importance, the first fluid pressure line 1 is by hydraulicchange-over valve (as
One control unit 10) to close, the second fluid pressure line 2 begins through hydraulicchange-over valve (as first control unit 10) and enters first
Connecting pipeline 4, and right chamber room 25 is entered by the first connecting pipeline 4, it is not provided with pressure-reducing valve 6 due on the second fluid pressure line 2,
Pressure in second fluid pressure line 2 is more than the pressure in the first fluid pressure line 1, and the pressure of the hydraulic oil in right chamber room 25 is equal to
Pressure in second fluid pressure line 2, and, the hydraulic oil that the pressure of this second fluid pressure line 2 is arranged to make this pressure pushes against
Execution piston 21, makes punch rod 22 that the pressure of workpiece is met with the elastic deformation that workpiece occurs original state, thus punch rod 22
Make workpiece that the elastic deformation of original state to occur in the second trip segment feeding, thus completing the second trip segment, workpiece completes just
The elastic deformation of beginning state.
After punch rod 22 feeding completes the second trip segment, initially enter third trip section, first in punch rod 22 dashes forward
The position going out portion 28 setting just can be when punch rod 22 enters into third trip section, and the first protuberance 28 just and triggers machine
The push rod 29 of structure contacts, and pushes against push rod 29, and this push rod 29 drives the Mechanical Driven reversal valve as the second control unit 11
Valve element switches to primary importance from the second place, so that the 3rd fluid pressure line 3 (the 3rd fluid pressure line 3 and the second hydraulic tube
Road 2 connects, and its pressure is identical with the second fluid pressure line 2) conducting, so that the hydraulic oil in the 3rd fluid pressure line 3 enters supercharging
The big footpath chamber 18 of mechanism, according to the above-mentioned pressurization of booster body, if being not provided with electromagnet 30 in middle part chamber 19,
The pressure in path chamber 17 is then made to raise at once, so that the pressure entering the hydraulic oil in right chamber room 25 raises at once,
So that punch rod 22 is when being fed to third trip section, the pressure of workpiece is raised at once, this does not obviously meet workpiece in bullet
(workpiece requires pressure gradually to rise from the pressure of elastic deformation stage in elastic-plastic deformation for the requirement to pressure for the plastic period
High), for preventing pressure from raising suddenly, the present invention arranges two electromagnets in middle part chamber 19, and an electromagnet 30 is fixed on
In second piston 15, another is fixed on the chamber wall relative with second piston 15, and the controlled device 26 of electromagnet 30 controls,
And execute the concrete trip segment that the displacement transducer 27 on cylinder body 20 is capable of identify that punch rod 22 feeding, when punch rod 22 enters
After third trip section, displacement transducer 27 constantly sends the displacement information of punch rod 22 to controller 26, this controller 26
Control two electromagnet 30 to produce initial magnetic repulsion according to displacement information, and constantly feed in third trip section with punch rod 22, make magnetic
Repulsion constantly reduces, and this initial magnetic repulsion should meet the pressure quilt exceeding in big footpath chamber 18 making in path chamber 17
This initial magnetic repulsion is offset, that is, meeting pressure balanced balanced type is：P1S1+F=P2S2 (wherein F be magnetic repulsion) is big as F
Little for initial magnetic repulsion when, P1=P2, when magnetic repulsion F with the feeding of punch rod 22 constantly little when, the pressure in path chamber 17
Pressure in power and right chamber room 25 constantly raises, so that punch rod 22 is when third trip section feeds, pressure constantly raises,
Meet the requirement to pressure for the workpiece elastic-plastic deformation.Because the first protuberance 28 is along the axially extending third trip section of punch rod 22
Distance so that punch rod 22 is when third trip section feeds, the 3rd fluid pressure line 3 turns on all the time, so that booster body
Constantly make pressure rise, so that workpiece punch forming.
After workpiece punch forming, the second protuberance 31 in backhaul control bar 23 contacts trigger switch 32 just, triggering
Switch 32 controls the 3rd control unit 12 and the 4th control unit 13, makes the hydraulic oil in right chamber room 25 enter backhaul pressure-keeping mechanism
In left pressurize chamber 37 in, for being provided with pressurize spring 39 in right chamber room 25, for making pressurize piston 36 be in poised state,
Hydraulic oil in left pressurize chamber 37 has certain pressure, so that the hydraulic oil in right chamber room 25 has certain pressure, but this
When right chamber room 25 in the pressure of hydraulic oil be less than the pressure of the hydraulic oil in left chamber 24, hydraulic oil in left chamber 24 drives
Execution piston 21, so that punch rod 22 backhaul.So far, punch rod 22 completes a punching course, processes a workpiece.
One key point of the present invention is：Setting booster body and Magnetic Control mechanism in hydraulic control, should
Booster body and the cooperation of Magnetic Control mechanism make punch rod 22 enter third trip section so that workpiece occurs elastic-plastic deformation
When, pressure constantly raises, thus meeting the requirement that workpiece is gradually increased to pressure in elastic-plastic deformation, due to the liquid of the present invention
Pressure controlling organization makes punch rod 22 meet the change of three trip segment pressure, so that the workpiece stiffness stamping out is preferably, and
And the scrappage of stamped workpieces is relatively low.
The present invention has hydraulic control in the electrichydraulic control press of backhaul pressure holding function with respect to existing skill
Hydraulic control in art, more can meet the actual requirement of workpiece deformation, and the workpiece of punching press is better than using prior art
The workpiece that hydraulic control stamps out.
Another key point of the present invention is：Backhaul pressure-maintaining machine is provided with the return line of hydraulic control
Structure, this backhaul pressure-keeping mechanism makes right chamber room 25 have certain pressure, and this pressure makes the opening speed of punch rod 22 stable, from
And make to produce impact to execution oil cylinder during punch rod 22 backhaul.
Claims (5)
1. a kind of electrichydraulic control press with backhaul pressure holding function, for stamped workpieces it is characterised in that including execution
Mechanism and provide pressure for described executing agency and control the hydraulic control of described executing agency；Wherein：
Described executing agency include execute cylinder body, be arranged on described execution cylinder body in and by described execution cylinder body be divided into left chamber and
The execution piston of right chamber room and the punching press for stamped workpieces being connected with described execution piston and stretching out from described left chamber
Bar, described punch rod have be fed to the first trip segment of absorption surface, by workpiece punching press to the second of initial deformation state
Trip segment and by stamping forming for workpiece third trip section；
Hydraulic control includes：
First, second and third fluid pressure line, three is all connected with hydraulic system；
Pressure-reducing valve, it is arranged on the first fluid pressure line；
First control unit, its according to the trip segment of described punch rod control the first fluid pressure line and the second fluid pressure line with described
The break-make of right chamber room, so that when described punch rod feeds in the first trip segment, described first fluid pressure line passes through first and connects
Pipeline and described right chamber, when described punch rod is fed to the second trip segment from described first trip segment, described second
Fluid pressure line passes through the first connecting pipeline and described right chamber；
Booster body, it includes reducing plunger shaft, the first piston in the diameter segment that is arranged on described reducing plunger shaft, set
Put in the larger-diameter section of described reducing plunger shaft second piston and connect described first piston and described second live
The connecting rod of plug, wherein, described first piston and described second piston by reducing plunger shaft be divided into path chamber, big footpath chamber with
And middle part chamber, described 3rd fluid pressure line leads to described big footpath chamber, and described path chamber passes through the second connecting pipeline and institute
State right chamber；
Second control unit, it is arranged on described 3rd fluid pressure line, and described second control unit is according to described punch rod
Trip segment controls the break-make of described 3rd fluid pressure line, so that when described punch rod is fed to third trip section from the second trip segment
When, described 3rd fluid pressure line conducting；
Magnetic Control mechanism, it include being arranged on described middle part within the chamber and for push against described second piston two electromagnet,
It is arranged on described execution cylinder body and for obtaining the displacement transducer of trip segment of described punch rod and according to described displacement
The controller of the size of magnetic repulsion of feeding Process flowchart two electromagnet of the third trip section acquired in sensor, so that work as institute
State after punch rod is fed to third trip section, described controller control the magnetic repulsion between electromagnet described in two so that magnetic repulsion with
The feeding process of described punch rod and reduce, so that the pressure of the hydraulic oil of described path within the chamber is with the feeding of described punch rod
Process raises from the pressure value of the hydraulic oil indoor equal to left chamber；
Backhaul pressure-keeping mechanism, it is used for when described punch rod is by workpiece punch forming backhaul, and described backhaul pressure-keeping mechanism makes
Described right chamber room has predetermined pressure.
2. the electrichydraulic control press with backhaul pressure holding function according to claim 1 is it is characterised in that described
One control unit is hydraulicchange-over valve, and the valve element of described hydraulicchange-over valve has makes described first fluid pressure line pass through the first connection
Pipeline makes the primary importance of described second fluid pressure line and described right chamber room disconnection and make described with described right chamber room and simultaneously
Second fluid pressure line connects the first connecting pipeline and makes described first fluid pressure line and the described right side with described right chamber and simultaneously
The second place that chamber disconnects；The valve element of described hydraulicchange-over valve passes through the first control piper connecting respectively with described left chamber
With switch between the first position and the second position with the control of the second control piper of described right chamber, so that when described
When the first trip segment is fed to the second trip segment, the valve element of described hydraulicchange-over valve switches to second by primary importance to punch rod
Position.
3. the electrichydraulic control press with backhaul pressure holding function according to claim 1 is it is characterised in that described
Two control units are Mechanical Driven reversal valve, and the valve element of described Mechanical Driven reversal valve has makes the of the 3rd fluid pressure line conducting
One position and the second place making described 3rd fluid pressure line disconnection, the described electrichydraulic control pressure with backhaul pressure holding function
Machinery also includes trigger mechanism, and described trigger mechanism includes being connected and towards described punching press with the valve element of described Mechanical Driven reversal valve
Push rod that bar direction is stretched out and be arranged on the first protuberance in described punch rod, described first protuberance is in described punch rod
Direction of feed on extend third trip section distance, to be fed to third trip section when described punch rod from the second trip segment
When, described first protuberance pushes against described push rod so that described push rod drives the valve element of described Mechanical Driven reversal valve from second
Put and switch to primary importance.
4. the electrichydraulic control press with backhaul pressure holding function according to claim 1 is it is characterised in that described time
Journey pressure-keeping mechanism includes pressurize cylinder body, the pressurize piston being arranged in described pressurize cylinder body, and described pressurize piston is by described pressurize
Cylinder body becomes left pressurize chamber and right pressurize chamber respectively, and described right pressurize within the chamber is provided with pressurize spring, described right pressurize chamber
Room is connected with fuel tank by a check valve being set with predetermined conducting pressure, the described electrichydraulic control pressure with backhaul pressure holding function
Power machinery also includes the 3rd control unit and the 4th control unit that trigger switch is electrically connected, described work with described trigger switch
It is additionally provided with the backhaul control bar stretching out described right chamber room beyond the Great Wall, described backhaul control bar is provided with for triggering described triggering
Second protuberance of switch, described 3rd control unit is arranged on described first connecting pipeline, and described three control units have
Make the first state of described first connecting pipeline conducting and make that described first connecting pipeline disconnects and so that described right chamber room is led to
Cross the second state of the 4th connecting pipeline and described left pressurize chamber, described 4th control unit is arranged on described first control
On tubulation road, described 4th control unit has the first state making described first control piper conducting and makes described first control
The second state that tubulation road disconnects, when described punch rod completes third trip section, described second protuberance triggers described triggering
Switch, so that described 3rd control unit switches to the second state by its first state, makes described 4th control unit by the first shape
State switches to the second state；Described first fluid pressure line is connected with described left chamber by third connecting pipe.
5. the electrichydraulic control press with backhaul pressure holding function according to claim 4 is it is characterised in that described
Three control units and described 4th control unit are solenoid directional control valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611036751.4A CN106424278B (en) | 2016-11-22 | 2016-11-22 | Electrichydraulic control press with backhaul pressure holding function |
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| CN201611036751.4A CN106424278B (en) | 2016-11-22 | 2016-11-22 | Electrichydraulic control press with backhaul pressure holding function |
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| CN106424278B CN106424278B (en) | 2019-05-17 |
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| CN108435923A (en) * | 2018-06-11 | 2018-08-24 | 安祖桂 | Full-automatic press forming die |
| CN108889818A (en) * | 2018-06-11 | 2018-11-27 | 安祖桂 | Automatic stamping Matched Molds device |
| CN111872243A (en) * | 2020-07-27 | 2020-11-03 | 昆山盛世伟图电子科技有限公司 | Intelligent control hydraulic tool |
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| CN2188474Y (en) * | 1994-01-08 | 1995-02-01 | 福州海源石材机械有限公司 | Hydraulic amplifier for presser |
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| CN108435923A (en) * | 2018-06-11 | 2018-08-24 | 安祖桂 | Full-automatic press forming die |
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| CN111872243B (en) * | 2020-07-27 | 2022-04-01 | 昆山盛世伟图电子科技有限公司 | Intelligent control hydraulic tool |
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| CN106424278B (en) | 2019-05-17 |
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Effective date of registration: 20190419 Address after: 223300 Factory Building A17 of Wenzhou Industrial Park, Huaiyin District, Huaian City, Jiangsu Province Applicant after: Huai'an Lifute Mechanical and Electrical Co., Ltd. Address before: 300000 Negative Floor B111 of Binhu Building, Huanhu Middle Road, Hexi District, Tianjin Applicant before: Tianjin Jie Jie Technology Co., Ltd. |
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