CN106368995B - Electrichydraulic control press with feeding function of increasing pressure and backhaul pressure holding function - Google Patents
Electrichydraulic control press with feeding function of increasing pressure and backhaul pressure holding function Download PDFInfo
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- CN106368995B CN106368995B CN201611036762.2A CN201611036762A CN106368995B CN 106368995 B CN106368995 B CN 106368995B CN 201611036762 A CN201611036762 A CN 201611036762A CN 106368995 B CN106368995 B CN 106368995B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
Abstract
The invention discloses a kind of electrichydraulic control press with feeding function of increasing pressure and backhaul pressure holding function, including executing agency and hydraulic control；Hydraulic control includes: the first, second and third fluid pressure line；Pressure reducing valve；First control unit；Booster body；Second control unit；Hydraulically-damped control mechanism.The booster body of hydraulic control and hydraulically-damped control mechanism cooperate so that punch rod is when entering third trip section so that elastic-plastic deformation occurs for workpiece, to meet the requirement that workpiece gradually increases pressure in elastic-plastic deformation, since hydraulic control of the invention makes punch rod meet the variation of three trip segment pressure, to keep the workpiece stiffness stamped out preferable.Backhaul pressure-keeping mechanism is provided on the oil return line of hydraulic control, which makes right chamber have certain pressure, which stablize the opening speed of punch rod, to will not generate impact to oil cylinder is executed when making punch rod backhaul.
Description
Technical field
The present invention relates to electrohydraulic control technology fields, more particularly to one kind to have feeding function of increasing pressure and backhaul pressure holding function
Electrichydraulic control press.
Background technique
In the prior art, punching press is carried out to workpiece and usually utilizes two kinds of power forms, first is that using machine driving as dynamic
Power, i.e. machine power；Second is that using hydraulic drive as power, i.e. hydraulic power.In general, when workpiece deformation reduces, and workpiece
Elastoplasticity modulus it is smaller, workpiece deform needed for pressure it is smaller when, it is more appropriate using machine power because machine power makes
The punching press movement for obtaining punch rod is very fast.When workpiece deforms larger, and the elastoplasticity modulus of workpiece is larger, pressure needed for workpiece deforms
It is more appropriate using hydraulic power when larger, because hydraulic power is capable of providing biggish pressure, so as to become workpiece
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 needs be only limited by constant stamping press i.e.
Achievable molding, however, applicant is had found after analysis and summary in a large amount of shock pressure experiments using elastic plastic theory, in punching press
Cheng Zhong, workpiece tool is there are two the deformation in stage, i.e. the simple flexible deformation of initial stage and to the elastoplasticity after final molding
Mixed deformation, in the deformation process of initial stage, constant pressure can just make workpiece that constant deformation occur, and when subsequent
The elastic-plastic deformation stage, need gradually be pressurized just workpiece can be made to continue to deform, thus final molding.In order to enable workpiece
Final molding, pressure needed for pressure of the punch rod to workpiece is actually disposed above elastic-plastic deformation by engineers and technicians always
Power, and the pressure is made to keep constant (because engineers and technicians think that whole deformation pressure process is constant), thus ability
Make workpiece punch forming, to make workpiece in the flexible deformation of initial stage, the pressure being subject to is much larger than required pressure, so
And the higher constant pressure keeps the deformation in the stage very fast, is unable to homogeneous deformation so as to cause the stage, at this stage cannot
Homogeneous deformation causes shaping workpiece mechanical property poor, as rigidity is poor or punching press failure.
Higher constant pressure is needed since technical staff thinks stamped workpieces only, engineers and technicians are setting
When counting or selecting mechanically or hydraulically power, it need to only make the higher forced feed that punch rod is kept constant.Therefore, existing skill
It is used to drive the hydraulic system of punch rod that can only provide constant pressure to punch rod in art, according to the foregoing description of applicant
It is found that poor using the workpiece mechanics that the hydraulic system stamps out.
According to the foregoing description of applicant, punch rod should have there are three trip segment carrying out punching course, i.e., punch rod into
Make the flexible deformation trip segment (second stroke of workpiece flexible deformation to idle stroke section (first stroke section), the punch rod to workpiece
Section) and punch rod make workpiece that elastic-plastic deformation and final stamping forming elastic-plastic deformation trip segment (third trip occur
Section).
In addition, also being had the disadvantages that for the hydraulic system of punching press in the prior art
1, the backhaul of punch rod controls complicated, and backhaul reaction is not sensitiveer.
2, when punch rod backhaul, opening speed is unstable, causes each return interval different.
3, the first stage of punch rod and second stage feed speed are unstable, and pressure change response is slower.
Summary of the invention
For above-mentioned technical problem present in existing technology, of the invention implementing provides one kind and is able to solve above-mentioned one
A or Railway Project electrichydraulic control press with feeding function of increasing pressure and backhaul pressure holding function.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
A kind of electrichydraulic control press with feeding function of increasing pressure and backhaul pressure holding function is used for stamped workpieces, packet
It includes executing agency and provides pressure for the executing agency and control the hydraulic control of the executing agency；Wherein:
The executing agency includes executing cylinder body, be arranged in the execution cylinder body and the execution cylinder body being divided into left chamber
The execution piston of room and right chamber and connect with the execution piston and that stretches out from the left chamber is used for stamped workpieces
Punch rod, the punch rod, which has, is fed to the first stroke section contacted with workpiece, by workpiece punching press to initial deformation state
Second stroke section and by the stamping forming third trip section of workpiece；
Hydraulic control includes:
First, second and third fluid pressure line, three connect with hydraulic system；
Pressure reducing valve is arranged on the first fluid pressure line；
First control unit, according to the trip segment of the punch rod control the first fluid pressure line and the second fluid pressure line with
The on-off of the right chamber, so that first fluid pressure line passes through first when the punch rod is when first stroke section is fed
Connecting pipeline is connected to the right chamber, described when the punch rod is fed to second stroke section from the first stroke section
Second fluid pressure line is connected to by the first connecting pipeline with the right chamber；
Booster body comprising variable diameter plunger shaft, first be arranged in the diameter segment of the variable diameter plunger shaft are living
The second piston that fill in, is arranged in the larger-diameter section of the variable diameter plunger shaft is fixed on the first connecting rod stated on first piston
And the second connecting rod for being fixed in the second piston and being oppositely arranged with the first connecting rod, wherein the first piston
Variable diameter plunger shaft is divided into path chamber, major diameter chamber and middle part chamber with the second piston, the first connecting rod and
The second connecting rod is located in the middle part chamber, and the third fluid pressure line leads to the major diameter chamber, the path chamber
It is connected to by the second connecting pipeline with the right chamber；
Second control unit is arranged on the third fluid pressure line, and second control unit is according to the punching press
The trip segment of bar controls the on-off of the third fluid pressure line, so that when the punch rod is fed to the third line from second stroke section
When journey section, the third fluid pressure line conducting；
Hydraulically-damped control mechanism comprising be fixed on the buffering cylinder body of the end of the first connecting rod, be fixed on it is described
The damper piston in the buffering cylinder body is simultaneously protruded into the end of second connecting rod, wherein the damper piston and the buffering cylinder body
A buffer chamber is surrounded, the cushion chamber falls are provided with for the buffer spring against the damper piston, the cushion chamber
Room is connected to by throttle valve with accumulator, and the middle part chamber is connected to the accumulator, and the highest of the accumulator limits pressure
Power is less than the pressure of second fluid pressure line；
Backhaul pressure-keeping mechanism is used for when the punch rod is by workpiece punch forming backhaul, the backhaul pressure-keeping mechanism
So that the right chamber has predetermined pressure.
Preferably, the first control unit is hydraulic directional valve, and the spool of the hydraulic directional valve has and makes described the
One fluid pressure line is connected to the right chamber by the first connecting pipeline and makes second fluid pressure line and the right chamber simultaneously
The first position and be connected to second fluid pressure line with the right chamber and simultaneously by the first connecting pipeline that room disconnects
The second position for disconnecting first fluid pressure line and the right chamber；The spool of the hydraulic directional valve by respectively with institute
State the control of the first control piper and the second control piper being connected to the right chamber of left chamber's connection in first position and
Switch between the second position, so that when the punch rod is fed to second stroke section from first stroke section, the commutation of surging
The spool of valve switches to the second position by first position.
Preferably, second control unit is Mechanical Driven reversal valve, and the spool of the Mechanical Driven reversal valve has
The first position that third fluid pressure line is connected and the second position for disconnecting the third fluid pressure line, it is described that there is feeding
Function of increasing pressure and the electrichydraulic control press of backhaul pressure holding function further include trigger mechanism, the trigger mechanism include with it is described
The spool of Mechanical Driven reversal valve connects and the mandril that stretches out towards the punch rod direction and is arranged in the punch rod
First protruding portion, first protruding portion extends the distance of third trip section in the direction of feed of the punch rod, to work as
When stating punch rod and being fed to third trip section from second stroke section, first protruding portion pushes against the mandril so that the mandril
The spool of the Mechanical Driven reversal valve is driven to switch to first position from the second position.
Preferably, the backhaul pressure-keeping mechanism includes pressure maintaining cylinder body, is arranged in the intracorporal pressure maintaining piston of the holding tank, institute
Pressure maintaining piston is stated by the pressure maintaining cylinder body respectively at left pressure maintaining chamber and right pressure maintaining chamber, is provided with guarantor in the right pressure maintaining chamber
Pressing spring, the check valve that the right pressure maintaining chamber is set with predetermined conducting pressure by one are connect with fuel tank, the electrichydraulic control
Press further includes trigger switch, the third control unit being electrically connected with the trigger switch and the 4th control unit, described
It executes and is additionally provided with the backhaul control-rod for stretching out the right chamber on piston, be provided on the backhaul control-rod for triggering
The second protruding portion of trigger switch is stated, the third control unit is arranged on first connecting pipeline, and three control is single
Member there is the first state for making first connecting pipeline conducting and make that first connecting pipeline disconnects and make the right side
Chamber passes through the second state of the 4th connecting pipeline and the left pressure maintaining chamber, and the 4th control unit is arranged described
On first control piper, the 4th control unit has the first state for making the first control piper conducting and makes described
The second state that first control piper disconnects, when the punch rod completes third trip section, second protruding portion triggers institute
Trigger switch is stated so that the third control unit switches to the second state by its first state, make the 4th control unit by
First state switches to the second state；First fluid pressure line is connected to by third connecting pipe with the left chamber.
Preferably, the third control unit and the 4th control unit are solenoid directional control valve.
Compared with prior art, the electrichydraulic control press machine with feeding function of increasing pressure and backhaul pressure holding function of the invention
The beneficial effect of tool is: the booster body of hydraulic control and hydraulically-damped control mechanism cooperate so that punch rod is entering the
When triple-travel section is so that elastic-plastic deformation occurs for workpiece, pressure is constantly increased, to meet workpiece in elastic-plastic deformation to pressure
The requirement that power gradually increases, since hydraulic control of the invention makes punch rod meet the variation of three trip segment pressure,
To keep the workpiece stiffness stamped out preferable, and the scrappage of stamped workpieces is lower.
The opening size of the throttle valve can control first piston and second piston is in the time of differential state, also control
The displacement that first piston and second piston are advanced when being in differential state, when being reacted to punch rod, that is, throttle valve can be controlled
Punch rod unit displacement (feeding displacement) processed can also control the punch rod unit time to workpiece pressure to the increment rate of workpiece pressure
The increment rate of power.So as to control workpiece in the increase change rate of the requirement pressure in elastic-plastic deformation stage, so that punching press is not
With the workpiece of material and size, it is allowed to form.
Hydraulic control in the electrichydraulic control press with feeding function of increasing pressure and backhaul pressure holding function of the invention
Mechanism compared with the existing technology in hydraulic control, can more meet the actual requirement of workpiece deformation, the workpiece of punching press is excellent
In the workpiece that the hydraulic control using the prior art stamps out.
Backhaul pressure-keeping mechanism is provided on the oil return line of hydraulic control, which makes right chamber
With certain pressure, which stablize the opening speed of punch rod, thus will not be to execution oil cylinder when making punch rod backhaul
Generate impact.
Detailed description of the invention
Fig. 1 is that the structure with the electrichydraulic control press of feeding function of increasing pressure and backhaul pressure holding function of the invention is shown
It is intended to.
In figure:
The first fluid pressure line of 1-；The second fluid pressure line of 2-；3- third fluid pressure line；The first connecting pipeline of 4-；5- second connects
Siphunculus road；6- pressure reducing valve；The first control piper of 7-；The second control piper of 8-；9- third connecting pipe；10- first control unit；
The second control unit of 11-；12- third control unit；The 4th control unit of 13-；14- first piston；15- second piston；16-
Two connecting rods；17- path chamber；18- major diameter chamber；Chamber in the middle part of 19-；20- executes cylinder body；21- executes piston；22- punch rod；
23- backhaul control-rod；24- left chamber；25- right chamber；26- buffer chamber；27- buffer spring；The first protruding portion of 28-；The top 29-
Bar；30- first connecting rod；The second protruding portion of 31-；32- trigger switch；33- fuel tank；34- throttle valve；35- damper piston；36- stores
It can device；37- check valve；38- pressure maintaining cylinder body；39- pressure maintaining piston；The left pressure maintaining chamber of 40-；The right pressure maintaining chamber of 41-；42- pressure maintaining bullet
Spring；The 4th connecting pipeline of 43-.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, with reference to the accompanying drawing and specific embodiment party
Formula elaborates to the present invention.
Before introducing the electrichydraulic control press with feeding function of increasing pressure and backhaul pressure holding function of the invention, first
The process for the workpiece Pressing Deformation that is stamped and the punch rod 22 (or pressure head) of stamped workpieces are introduced in entire punching course
Several trip segments are so as to deeply understand technical solution of the present invention and beneficial effect.
Traditionally, workpiece needs i.e. plastic by enough and constant pressure, however, workpiece is in practical distortion
In, pressure needed for the deformation with different phase is different.Workpiece undergoes two kinds of deformations to molding from blank altogether, first is that the initial stage
Simple flexible deformation, at this point, the enough constant pressure of 22 need of punch rod can make workpiece carry out flexible deformation；Second is that
Elastoplasticity mixed deformation, both there is flexible deformation in this stage has in the presence of being plastically deformed, at this point, punch rod 22 is while feeding
It needs to gradually increase pressure, to make workpiece final molding.
From the foregoing, it will be observed that needing to have there are three trip segment in punching course for punch rod 22, i.e. punch rod 22 is fed to work
Idle stroke section (first stroke section), the punch rod 22 of part make the flexible deformation trip segment (second stroke section) of workpiece flexible deformation with
And punch rod 22 makes workpiece that elastic-plastic deformation and final stamping forming elastic-plastic deformation trip segment (third trip section) occur.
In first stroke section, power mechanism (can be machine power or hydraulic power) only need to be that punch rod 22 provides movement
, in second stroke section, power mechanism to provide certain constant pressure for punch rod 22 so that workpiece flexible deformation,
Third trip section, power mechanism will provide the pressure of start bit second stroke section for punch rod 22, and with the feeding of punch rod 22
The pressure that pressure gradually rises, so that workpiece be made to realize elastic-plastic deformation.
The present invention is based on foregoing descriptions, and providing one kind enables punch rod 22 to be capable of providing corresponding pressure in three trip segments
The electrichydraulic control press with feeding function of increasing pressure and backhaul pressure holding function of power
As shown in Figure 1, embodiment of the invention discloses a kind of electricity with feeding function of increasing pressure and backhaul pressure holding function
Hydraulic control pressing pressure is mechanical, is used for stamped workpieces, this has the electrichydraulic control press machine of feeding function of increasing pressure and backhaul pressure holding function
Tool includes executing agency and provides pressure for executing agency and control the hydraulic control of executing agency；Wherein: executing machine
Structure includes executing cylinder body 20, being arranged in execution cylinder body 20 and divide cylinder body 20 is executed for the execution of left chamber 24 and right chamber 25
Piston 21 and with execute piston 21 connect and from left chamber 24 stretch out the punch rod 22 for stamped workpieces, punch rod 22 tool
Have and is fed to the first stroke section contacted with workpiece, by the second stroke section of workpiece punching press to initial deformation state and by workpiece
Stamping forming third trip section；Hydraulic control includes: the first, second and third fluid pressure line, and three connects with hydraulic system
It connects；Pressure reducing valve 6 is arranged on the first fluid pressure line 1；First control unit 10 is controlled according to the trip segment of punch rod 22
The on-off of first fluid pressure line 1 and the second fluid pressure line 2 and right chamber 25, so that when punch rod 22 is fed in first stroke section
When, the first fluid pressure line 1 is connected to by the first connecting pipeline 4 with right chamber 25, when punch rod 22 is fed to from first stroke section
When second stroke section, the second fluid pressure line 2 is connected to by the first connecting pipeline 4 with right chamber 25；Booster body comprising variable diameter
Plunger shaft, the first piston 14 being arranged in the diameter segment of variable diameter plunger shaft, the larger diameter that variable diameter plunger shaft is set
Section in second piston 15, be fixed on the first connecting rod 30 stated on first piston 14 and be fixed in second piston 15 and with
The second connecting rod 16 that first connecting rod 30 is oppositely arranged, wherein variable diameter plunger shaft is divided by first piston 14 and second piston 15
Path chamber 17, major diameter chamber 18 and middle part chamber 19, first connecting rod 30 and second connecting rod 16 are located in middle part chamber 19, the
Three fluid pressure lines 3 lead to major diameter chamber 18, and path chamber 17 is connected to by the second connecting pipeline 5 with right chamber 25；Second control
Unit 11 is arranged on third fluid pressure line 3, and the second control unit 11 is hydraulic according to the trip segment of punch rod 22 control third
The on-off of pipeline 3, so that third fluid pressure line 3 is connected when punch rod 22 is fed to third trip section from second stroke section；Liquid
Power buffer control mechanism comprising be fixed on the buffering cylinder body of the end of first connecting rod 30, be fixed on the end of second connecting rod 16
And protrude into the damper piston 35 in buffering cylinder body, wherein damper piston 35 and buffering cylinder body surround a buffer chamber 26, cushion chamber
It is provided in room 26 for the buffer spring 27 against damper piston 35, buffer chamber 26 is connected by throttle valve 34 and accumulator 36
Logical, middle part chamber 19 is connected to accumulator 36, and the highest of accumulator 36 limits pressure of the pressure less than the second pipeline；Backhaul pressure maintaining
Mechanism is used for when punch rod 22 is by workpiece punch forming backhaul, and backhaul pressure-keeping mechanism makes right chamber 25 have pre- level pressure
Power.
In a preferred embodiment of the invention, first control unit 10 is hydraulic directional valve, the valve of hydraulic directional valve
Core has and so that the first fluid pressure line 1 is passed through the first connecting pipeline 4 and right chamber 25 and make the second fluid pressure line 2 and right chamber simultaneously
25 first positions disconnected and make the second fluid pressure line 2 be connected to the first connecting pipeline 4 to be connected to right chamber 25 and make the simultaneously
The second position that one fluid pressure line 1 is disconnected with right chamber 25；The spool of hydraulic directional valve, which passes through, to be respectively connected to left chamber 24
The control of first control piper 7 and the second control piper 8 being connected to right chamber 25 is cut between the first position and the second position
It changes, so that the spool of hydraulic directional valve is cut by first position when punch rod 22 is fed to second stroke section from first stroke section
Shift to the second position.
In a preferred embodiment of the invention, the second control unit 11 is Mechanical Driven reversal valve, and Mechanical Driven is changed
The second position that there is the first position that third fluid pressure line 3 is connected to the spool of valve and disconnect third fluid pressure line 3,
Electrichydraulic control press with feeding function of increasing pressure and backhaul pressure holding function further includes trigger mechanism, trigger mechanism include with
The spool of Mechanical Driven reversal valve connects and the mandril 29 that stretches out towards 22 direction of punch rod and be arranged in punch rod 22 the
One protruding portion 28, the first protruding portion 28 extends the distance of third trip section in the direction of feed of punch rod 22, to work as punch rod
22 when being fed to third trip section from second stroke section, and the first protruding portion 28 pushes against mandril 29 so that mandril 29 drives Mechanical Driven
The spool of reversal valve switches to first position from the second position.
In a preferred embodiment of the invention, backhaul pressure-keeping mechanism includes pressure maintaining cylinder body 38, is arranged in pressure maintaining cylinder body
Pressure maintaining piston 39 in 38, pressure maintaining piston 39 is by pressure maintaining cylinder body 38 respectively at left pressure maintaining chamber 40 and right pressure maintaining chamber 41, right guarantor
Pressure maintaining spring 42, the check valve 37 and oil that right pressure maintaining chamber 41 is set with predetermined conducting pressure by one are provided in pressure chamber 41
Case 33 connects, and electrichydraulic control press further includes trigger switch 32, the third control unit being electrically connected with trigger switch 32 12
With the 4th control unit 13, it is additionally provided with the backhaul control-rod 23 for stretching out right chamber 25 on piston, is arranged on backhaul control-rod 23
There is the second protruding portion 31 for triggering trigger switch 32, third control unit 12 is arranged on the first connecting pipeline 4, three controls
Unit there is the first state that the first connecting pipeline 4 is connected and make that the first connecting pipeline 4 disconnects and keep right chamber 25 logical
The second state that the 4th connecting pipeline 43 is connected to left pressure maintaining chamber 40 is crossed, the 4th control unit 13 is arranged in the first control piper
On 7, the 4th control unit 13 has the first state that the first control piper 7 is connected and disconnects the first control piper 7
Second state, when punch rod 22 completes third trip section, the second protruding portion 31 triggers trigger switch 32 so that third control is single
Member 12 switches to the second state by its first state, and the 4th control unit 13 is made to switch to the second state by first state；First
Fluid pressure line 1 is connected to by third connecting pipe 9 with left chamber 24.
Wherein, the predetermined conducting pressure of check valve 37 refers to that, when 22 backhaul of punch rod, the pressure rise of right chamber 25 is arrived
When pressure maintaining spring 42 is fully compressed, the opening pressure of right chamber 25 and pressure namely check valve 37 in left pressure maintaining chamber 40.
In a preferred embodiment of the invention, third control unit 12 and the 4th control unit 13 are electromagnetic switch
Valve.
For convenience of technical solution of the present invention and beneficial effect is understood, being described below of the invention has feeding pressurization
The electrichydraulic control press course of work of function and backhaul pressure holding function.
It is first before introducing the electrichydraulic control press course of work with feeding function of increasing pressure and backhaul pressure holding function
First introduce the supercharger in the electrichydraulic control press with feeding function of increasing pressure and backhaul pressure holding function of the invention
The pressurization principle of structure and the working principle of hydraulically-damped control mechanism, to better understand electrichydraulic control pressure of the invention
Machine work process.
If first piston 14 and the second piston 15 only stress balance by the thrust of hydraulic oil, and 14 He of first piston
The rigid connection of both second pistons 15, i.e., first piston 14 is connected with second piston 15 by a connecting rod, 14 He of first piston
Second piston 15 moves synchronously always, and the hydraulic oil in path chamber 17 should be equal to major diameter chamber to the thrust of first piston 14
Hydraulic oil in 18 is to the thrust of second piston 15, i.e. (wherein, P1 is the pressure of the hydraulic oil in path chamber 17 to P1S1=P2S2
Power, P2 are the pressure of the hydraulic oil in major diameter chamber 18, and S1 is the area of section of first piston 14；S2 is cutting for second piston 15
Face area), since the area of section S2 of second piston 15 is greater than the area of section S1 of first piston 14, to make path chamber 17
The pressure P1 of interior hydraulic oil is greater than the pressure P2 of the hydraulic oil in major diameter chamber 18, therefore, when hydraulic oil enters booster body
Major diameter chamber 18 after, path chamber 17 convey hydraulic oil pressure be greater than major diameter chamber 18 in hydraulic oil pressure, tool
Body size relation and first piston 14 are related with the area of section of second piston 15 ratio.
Should explain: the pressure change relationship of above-mentioned booster body be built upon two-piston only by hydraulic oil thrust simultaneously
And two-piston move synchronously (such as two-piston rigid connection) under the premise of obtain.
Hydraulically-damped control mechanism makes first piston 14 and second piston 15 pass through first connecting rod 30 and second connecting rod 16
Connection, when the major diameter chamber 18 in booster body is not passed through or is passed through the hydraulic oil of lower pressure, and simultaneously accumulator 36 to
The hydraulic oil of certain pressure is provided in buffer chamber 26, so that first connecting rod 30 and second connecting rod 16 be made to keep opposing stationary, is delayed
It rushes spring 27 and is in lesser compressive state, at this point, major diameter chamber 18, path chamber 17, hydraulic oil in middle part chamber 19
Pressure and buffer spring 27 make at first piston 14 and second piston 15 thrust of first connecting rod 30 and second connecting rod 16
In static and equilibrium state, first piston 14 and second piston 15 are regarded as generally in equilibrium state.When logical to major diameter chamber 18
Hydraulic oil pushing and pressing second when the higher hydraulic oil of relative pressure (pressure provided greater than accumulator 36) is provided, in major diameter chamber 18
For piston 15 to make balance break, second piston 15 drives damper piston 35 mobile towards first piston 14 under the action of thrust,
The movement of simultaneous buffering piston 35 make the hydraulic oil in buffer chamber 26 constantly pass through throttle valve 34 to accumulator 36 punching fill can, delay
Spring 27 is rushed constantly to be compressed, in the process, first connecting rod 30 and second connecting rod 16 are mobile towards path chamber 17 always, but the
The movement speed of two connecting rods 16 is greater than first connecting rod 30 to make two connecting rods form differential namely second piston 15 and first and live
Plug 14 forms differential, and to after being compressed completely to buffer spring 27, the first company just moves synchronously namely second with second connecting rod 16
Piston 15 is moved synchronously with first piston 14, and first piston 14 and the stress balance of second piston 15 are established again at this time.According to
The above-mentioned pressurization principle to booster body, when first piston 14 is in equilibrium state with second piston 15, path chamber 17
The pressure P1 of interior hydraulic oil could be greater than the pressure P2 of the hydraulic oil in major diameter chamber 18, in the first of hydraulically-damped control mechanism
When beginning state, smaller pressure in major diameter chamber 18 is Pa, to make the pressure Pb in path chamber 17, when to major diameter chamber
It is Pa ' (Pa ') Pa that pressure is passed through in 18) hydraulic oil when, because provided with hydraulically-damped between first piston 14 and second piston 15
Control mechanism, so that the hydraulic fluid pressure in the path chamber 17 made is corresponding with Pa ' when equilibrium state there is no being increased at once
Pb ', and slowly rise since Pb, until buffer spring 27 is fully compressed, first piston 14 is synchronous with second piston 15
It moves after reaching new balance, the pressure in path chamber 17 just reaches Pb ' from Pb.
It can be seen from the above, booster body and hydraulically-damped control mechanism can make the pressure in path chamber 17 initial from one
The predetermined pressure of pressure rise, to make the pressure in right chamber 25 gradually rise, to keep stamping parts right in third trip section
Workpiece generates constantly raised pressure, to meet the requirement of workpiece elastic-plastic deformation.
As shown in Figure 1, the electrichydraulic control press with feeding function of increasing pressure and backhaul pressure holding function of the invention
Executive component for stamped workpieces is punch rod 22, and hydraulic control is used to provide power for punch rod 22 and make stamping parts
Corresponding pressure is applied to workpiece in above three trip segment, and is also used to control the backhaul of punch rod 22.
After hydraulic system starts fuel feeding, punch rod 22 starts close to workpiece and contact workpiece, at this point, as the first control
The spool of the hydraulic directional valve of unit 10 is in first position, and the first fluid pressure line 1 is after pressure reducing valve 6 reduces pressure by surging
Reversal valve (as first control unit 10) enters right chamber 25 into the first connecting pipeline 4 after the first connecting pipeline 4,
Hydraulic oil enters after right chamber 25 because pressure itself is lower, so that only providing feed motion for punch rod 22 (certainly, can also be simultaneously
The lesser power of pressure is provided), to make punch rod 22 constantly feed and then be contacted with workpiece, when punch rod 22 is contacted with workpiece
Afterwards, workpiece generates reaction force to punch rod 22 to resist the flexible deformation of workpiece, and punch rod 22, which passes to counter-force, executes work
Plug 21, so that the pressure of the hydraulic oil in right chamber 25 be made to increase, the pressure of the increase is transferred to liquid by the second control piper 8
The right end of the spool of dynamic reversal valve (as first control unit 10), to drive hydraulic directional valve (as first control unit
10) spool switches to the second position from first position.
After 22 contact workpiece of punch rod, punch rod 22 initially enters second stroke section, at this point, hydraulic directional valve (as
First control unit 10) spool switch to the second position from first position, the first fluid pressure line 1 (is made by hydraulic directional valve
For first control unit 10) it closes, the second fluid pressure line 2 begins through hydraulic directional valve (as first control unit 10) entrance
First connecting pipeline 4, and right chamber 25 is entered by the first connecting pipeline 4, due to being not provided with decompression on the second fluid pressure line 2
Valve 6, the pressure in the second fluid pressure line 2 are greater than the pressure in the first fluid pressure line 1, and the pressure of the hydraulic oil in right chamber 25
Equal to the pressure in the second fluid pressure line 2, also, the pressure of second fluid pressure line 2 is arranged to make the hydraulic oil of the pressure
Pushing and pressing execute piston 21, so that punch rod 22 is met the flexible deformation that original state occurs for workpiece to the pressure of workpiece, thus punching press
Bar 22 makes workpiece that the flexible deformation of original state occur when second stroke section is fed, to complete second stroke section, workpiece is complete
At the flexible deformation of original state.
After punch rod 22, which is fed, completes second stroke section, third trip section is initially entered, first in punch rod 22 is prominent
Out portion 28 be arranged position just can when punch rod 22 enters third trip section, the first protruding portion 28 just with triggering machine
The mandril 29 of structure contacts, and pushes against mandril 29, which drives the Mechanical Driven reversal valve as the second control unit 11
Spool switches to first position from the second position, to make third fluid pressure line 3 (the third fluid pressure line 3 and the second hydraulic tube
Road 2 is connected to, and pressure is identical as the second fluid pressure line 2) conducting, so that the hydraulic oil in third fluid pressure line 3 be made to enter pressurization
The major diameter chamber 18 of mechanism, can according to the above-mentioned buffering course of the above-mentioned pressurization of booster body and hydraulically-damped control mechanism
Know, when the spool of Mechanical Driven reversal valve (as the second control unit 11) is in the second position, i.e., punch rod 22 also in
It is since right chamber 25 is connected to by the second connecting pipeline 5 with path chamber 17, then hydraulic in right chamber 25 when second stroke section
The pressure of oil is equal to the pressure of the hydraulic oil in path chamber 17, which can make 22 stamped workpieces of punch rod make workpiece
Flexible deformation, therefore, when punch rod 22 just starts to be fed to third trip section, the pressure in path chamber 17 is equal to punch rod
22 in second stroke section hydraulic oil pressure, when the spool of Mechanical Driven reversal valve (as the second control unit 11) is from second
After position switches to first position, (pressure of the hydraulic oil is higher than being provided for accumulator 36 to the hydraulic oil of third fluid pressure line 3
Pressure, namely greater than the pressure of the hydraulic oil in buffer chamber 26, and the pressure for the hydraulic oil being equal in path chamber 17) into
Enter in major diameter chamber 18, the hydraulic oil in the major diameter chamber 18 pushes against second piston 15 towards the movement of first piston 14, damper piston
35 make the hydraulic oil in buffer chamber 26 enter accumulator 36 by throttle valve 34 under the driving of second piston 15, and press simultaneously
Contracting buffer spring 27, in the process, first piston 14 and second piston 15 are mobile towards path chamber 17, only second piston
15 movement speed is greater than the movement speed of first piston 14, thus formed it is differential, at this point, with first piston 14 and second living
The pressure of the continuous movement of plug 15, the hydraulic oil in path chamber 17 gradually rises, thus make punch rod 22 in third trip section,
The pressure of workpiece is constantly increased, after buffer spring 27 is fully compressed, first piston 14 starts synchronous with second piston 15
Movement, 15 stress balance of first piston 14 and second piston, so that the pressure of the hydraulic oil in path chamber 17 reaches most
Greatly, to make punch rod 22 reach maximum to the pressure of workpiece, punch rod 22 makes workpiece punch forming.
After workpiece punch forming, the second protruding portion 31 on backhaul control-rod 23 is exactly in contact with trigger switch 32, triggering
Switch 32 controls third control unit 12 and the 4th control unit 13, and the hydraulic oil in right chamber 25 is made to enter backhaul pressure-keeping mechanism
In left pressure maintaining chamber 40 in, for being provided with pressure maintaining spring 42 in right chamber 25, to make pressure maintaining piston 39 be in equilibrium state,
Hydraulic oil in left pressure maintaining chamber 40 has certain pressure, so that the hydraulic oil in right chamber 25 be made to have certain pressure, but this
When right chamber 25 in the pressure of hydraulic oil be less than the pressure of the hydraulic oil in left chamber 24, the hydraulic oil driving in left chamber 24
Piston 21 is executed, to make 22 backhaul of punch rod.So far, punch rod 22 completes a punching course, processes a workpiece.
A key point of the invention is: the booster body of hydraulic control makes with the cooperation of hydraulically-damped control mechanism
Punch rod 22 is obtained when entering third trip section so that elastic-plastic deformation occurs for workpiece, pressure constantly increases, to meet workpiece
The requirement that pressure is gradually increased in elastic-plastic deformation, since hydraulic control of the invention makes punch rod 22 meet three
The variation of a trip segment pressure, to keep the workpiece stiffness stamped out preferable, and the scrappage of stamped workpieces is lower.
It should illustrate: in hydraulically-damped control mechanism, it should make the area of section and first piston 14 of second piston 15
The ratio between area of section be equal to pressure and workpiece of the workpiece needed for the elastic deformation stage maximum required in elastic-plastic deformation
The ratio between pressure, that is to say, that can be according to pressure of the workpiece needed for elastic deformation stage and workpiece in elastic-plastic deformation when institute
The maximum pressure needed designs the area of section of two-piston.
Hydraulically-damped control mechanism control punch rod 22 is setting to a key factor of the rate of pressure rise of workpiece
Throttle valve 34, the opening size of the throttle valve 34 can control first piston 14 and second piston 15 be in differential state when
Between, the displacement that first piston 14 and second piston 15 are advanced when being in differential state is also controlled, when being reacted to punch rod 22,
That is, throttle valve 34 can control 22 unit displacement of punch rod (feeding displacement) to the increment rate of workpiece pressure, punching can be also controlled
Increment rate of 22 unit time of compression bar to workpiece pressure.So as to control workpiece in the requirement pressure in elastic-plastic deformation stage
Increase change rate, so that the workpiece of punching press different materials and size, is allowed to form.
Another key point of the invention is: backhaul pressure-maintaining machine is provided on the oil return line of hydraulic control
Structure, the backhaul pressure-keeping mechanism make right chamber 25 have certain pressure, which stablize the opening speed of punch rod 22, from
And make that impact will not be generated to oil cylinder is executed when 22 backhaul of punch rod.
The present invention has the hydraulic control machine in feeding function of increasing pressure and the electrichydraulic control press of backhaul pressure holding function
Structure compared with the existing technology in hydraulic control, can more meet the actual requirement of workpiece deformation, the workpiece of punching press is better than
The workpiece stamped out using the hydraulic control of the prior art.
Above embodiments are only exemplary embodiment of the present invention, are not used in the limitation present invention, protection scope of the present invention
It is defined by the claims.Those skilled in the art can within the spirit and scope of the present invention make respectively the present invention
Kind modification or equivalent replacement, this modification or equivalent replacement also should be regarded as being within the scope of the present invention.
Claims (5)
1. a kind of electrichydraulic control press with feeding function of increasing pressure and backhaul pressure holding function is used for stamped workpieces, special
Sign is, including executing agency and provides pressure for the executing agency and controls the hydraulic control machine of the executing agency
Structure；Wherein:
The executing agency include execute cylinder body, be arranged in the execution cylinder body and by the execution cylinder body be divided into left chamber and
The execution piston of right chamber and the punching press for stamped workpieces for connecting and being stretched out from the left chamber with the execution piston
Bar, the punch rod have be fed to the first stroke section contacted with workpiece, by workpiece punching press to initial deformation state second
Trip segment and by the stamping forming third trip section of workpiece；
Hydraulic control includes:
First, second and third fluid pressure line, three connect with hydraulic system；
Pressure reducing valve is arranged on the first fluid pressure line；
First control unit, according to the trip segment of the punch rod control the first fluid pressure line and the second fluid pressure line with it is described
The on-off of right chamber, so that first fluid pressure line passes through the first connection when the punch rod is when first stroke section is fed
Pipeline is connected to the right chamber, when the punch rod is fed to second stroke section from the first stroke section, described second
Fluid pressure line is connected to by the first connecting pipeline with the right chamber；
Booster body comprising variable diameter plunger shaft, is set the first piston being arranged in the diameter segment of the variable diameter plunger shaft
The second piston in the larger-diameter section of the variable diameter plunger shaft is set, the first connecting rod stated on first piston is fixed on and consolidates
The second connecting rod for being scheduled in the second piston and being oppositely arranged with the first connecting rod, wherein the first piston and described
Variable diameter plunger shaft is divided into path chamber, major diameter chamber and middle part chamber, the first connecting rod and described by second piston
Two connecting rods are located in the middle part chamber, and the third fluid pressure line leads to the major diameter chamber, and the path chamber passes through the
Two connecting pipelines are connected to the right chamber；
Second control unit is arranged on the third fluid pressure line, and second control unit is according to the punch rod
Trip segment controls the on-off of the third fluid pressure line, so that when the punch rod is fed to third trip section from second stroke section
When, the third fluid pressure line conducting；
Hydraulically-damped control mechanism comprising be fixed on the buffering cylinder body of the end of the first connecting rod, be fixed on described second
The damper piston in the buffering cylinder body is simultaneously protruded into the end of connecting rod, wherein the damper piston is surrounded with the buffering cylinder body
One buffer chamber, the cushion chamber falls are provided with for the buffer spring against the damper piston, and the buffer chamber is logical
It crosses throttle valve to be connected to accumulator, the middle part chamber is connected to the accumulator, and it is small that the highest of the accumulator limits pressure
In the pressure of second fluid pressure line；
Backhaul pressure-keeping mechanism is used for when the punch rod is by workpiece punch forming backhaul, and the backhaul pressure-keeping mechanism makes
The right chamber has predetermined pressure.
2. the electrichydraulic control press with feeding function of increasing pressure and backhaul pressure holding function according to claim 1,
Be characterized in that, the first control unit is hydraulic directional valve, the spool of the hydraulic directional valve have make it is described first hydraulic
Pipeline is connected to the right chamber by the first connecting pipeline and makes simultaneously second fluid pressure line and the right chamber to disconnect
First position and be connected to second fluid pressure line by the first connecting pipeline with the right chamber and described in making simultaneously
The second position that first fluid pressure line and the right chamber disconnect；The spool of the hydraulic directional valve by respectively with the left chamber
The control of the first control piper and the second control piper being connected to the right chamber of room connection is in first position and second
Switch between setting, so that when the punch rod is fed to second stroke section from first stroke section, the valve of the hydraulic directional valve
Core switches to the second position by first position.
3. the electrichydraulic control press with feeding function of increasing pressure and backhaul pressure holding function according to claim 1,
It is characterized in that, second control unit is Mechanical Driven reversal valve, and the spool of the Mechanical Driven reversal valve has and makes third
The first position of fluid pressure line conducting and the second position for disconnecting the third fluid pressure line, it is described that there is feeding pressurization function
It can further include trigger mechanism with the electrichydraulic control press of backhaul pressure holding function, the trigger mechanism includes and the machinery drives
The spool connection of dynamic reversal valve and the mandril stretched out towards the punch rod direction and it is arranged in the punch rod first prominent
Portion out, first protruding portion extend the distance of third trip section in the direction of feed of the punch rod, to work as the punching press
When bar is fed to third trip section from second stroke section, first protruding portion pushes against the mandril so that the mandril drives institute
The spool for stating Mechanical Driven reversal valve switches to first position from the second position.
4. the electrichydraulic control press with feeding function of increasing pressure and backhaul pressure holding function according to claim 2,
It is characterized in that, the backhaul pressure-keeping mechanism includes pressure maintaining cylinder body, is arranged in the intracorporal pressure maintaining piston of the holding tank, the pressure maintaining
The pressure maintaining cylinder body respectively at left pressure maintaining chamber and right pressure maintaining chamber, is provided with pressure maintaining bullet in the right pressure maintaining chamber by piston
Spring, the check valve that the right pressure maintaining chamber is set with predetermined conducting pressure by one are connect with fuel tank, the electrichydraulic control pressure
Machinery further includes trigger switch, the third control unit being electrically connected with the trigger switch and the 4th control unit, the execution
It is additionally provided with the backhaul control-rod for stretching out the right chamber on piston, is provided on the backhaul control-rod for triggering the touching
The second protruding portion of switch is sent out, the third control unit is arranged on first connecting pipeline, the three control units tool
Have the first state for making first connecting pipeline conducting and make that first connecting pipeline disconnects and make the right chamber
By the second state of the 4th connecting pipeline and the left pressure maintaining chamber, the 4th control unit is arranged described first
On control piper, the 4th control unit has the first state for making first control piper conducting and makes described first
The second state that control piper disconnects, when the punch rod completes third trip section, second protruding portion triggers the touching
Hair switchs so that the third control unit switches to the second state by its first state, makes the 4th control unit by first
State switches to the second state；First fluid pressure line is connected to by third connecting pipe with the left chamber.
5. the electrichydraulic control press with feeding function of increasing pressure and backhaul pressure holding function according to claim 4,
It is characterized in that, the third control unit and the 4th control unit are solenoid directional control valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611036762.2A CN106368995B (en) | 2016-11-22 | 2016-11-22 | Electrichydraulic control press with feeding function of increasing pressure and backhaul pressure holding function |
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| CN201611036762.2A CN106368995B (en) | 2016-11-22 | 2016-11-22 | Electrichydraulic control press with feeding function of increasing pressure and backhaul pressure holding function |
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| CN106368995B true CN106368995B (en) | 2019-04-09 |
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| CN109838424A (en) * | 2017-11-27 | 2019-06-04 | 江苏华澳橡胶机械有限公司 | A kind of high-precision locked mode pressure hydraulic control circuit and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS58212831A (en) * | 1982-06-03 | 1983-12-10 | Sumitomo Heavy Ind Ltd | Bottom knock out device of forging press |
| CN2052107U (en) * | 1989-03-29 | 1990-01-31 | 杜正义 | Gas pressurizer |
| WO2001066340A1 (en) * | 2000-03-06 | 2001-09-13 | Amada Company, Limited | Device and method for controlling stop of hydraulic press and device and method for detecting trouble of speed selector valve |
| JP2004237341A (en) * | 2003-02-07 | 2004-08-26 | Amada Co Ltd | Breakthrough shock absorber |
| CN201389592Y (en) * | 2009-05-08 | 2010-01-27 | 九江财兴卫浴实业有限公司 | Hydraulic expansion machine |
| US9719521B2 (en) * | 2012-06-18 | 2017-08-01 | Flowserve Management Company | Fluid intensifier for a dry gas seal system |
| CN205446218U (en) * | 2015-12-27 | 2016-08-10 | 天津尚吉液压设备有限公司 | Novel gas -liquid pressure cylinder |
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Effective date of registration: 20190314 Address after: 226600 Jiangzhuang Village Industrial Concentration Zone, Libao Town, Haian City, Nantong City, Jiangsu Province Applicant after: Nantong Kang Hai lathe 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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