CN106368993B - Double accumulators provide the electrichydraulic control press of hydraulic power - Google Patents
Double accumulators provide the electrichydraulic control press of hydraulic power Download PDFInfo
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- CN106368993B CN106368993B CN201611033968.XA CN201611033968A CN106368993B CN 106368993 B CN106368993 B CN 106368993B CN 201611033968 A CN201611033968 A CN 201611033968A CN 106368993 B CN106368993 B CN 106368993B
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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
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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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Presses (AREA)
- Press Drives And Press Lines (AREA)
Abstract
The invention discloses a kind of double accumulators to provide the electrichydraulic control press of hydraulic power, and hydraulic control includes: the first, second accumulator；First, second and third fluid pressure line；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, and pressure constantly increases, to meet the requirement that workpiece gradually increases pressure in elastic-plastic deformation.The pressure and power of hydraulic control provide (the first accumulator and the second accumulator) by two accumulators, first accumulator and the second accumulator are respectively pressure and feeding power needed for three trip segments of punch rod provide workpiece, the pressure that the pressure ratio oil pump that accumulator provides provides is more stable, to keep the workpiece stability processed good, interchangeability is higher.
Description
Technical field
The present invention relates to electrohydraulic control technology fields more particularly to a kind of double accumulators to provide the electrichydraulic control of hydraulic power
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 double accumulators provide the electrichydraulic control press of hydraulic power.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
A kind of electrichydraulic control press of double accumulator offer hydraulic powers, is used for stamped workpieces, including executing agency
And pressure is provided for the executing agency and controls 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:
The pressure of first accumulator and the second accumulator, hydraulic oil provided by first accumulator is less than described second
The pressure of hydraulic oil provided by accumulator；
First, second and third fluid pressure line, the first fluid pressure line are connect with first accumulator, the second fluid pressure line and
Two fluid pressure lines are connect with second accumulator；
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 third accumulator, and the middle part chamber is connected to the third accumulator, the third accumulator
Highest limit pressure be less than hydraulic second pipeline pressure；
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, double accumulators
The electrichydraulic control press for providing hydraulic power further includes trigger mechanism, and the trigger mechanism includes changing with the Mechanical Driven
It is connected to the spool of valve and the mandril stretched out towards the punch rod direction and the first protruding portion for being arranged in the punch rod,
First protruding portion extends the distance of third trip section in the direction of feed of the punch rod, when the punch rod is from the
When two trip segments are fed to third trip section, first protruding portion pushes against the mandril so that the mandril drives the machinery
The spool of driving reversal valve switches 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, double accumulators of the invention provide the beneficial effect of the electrichydraulic control press of hydraulic power
Fruit is: the booster body of hydraulic control and hydraulically-damped control mechanism cooperate so that punch rod enter third trip section with
When making workpiece that elastic-plastic deformation occur, pressure is constantly increased, and gradually increases in elastic-plastic deformation to pressure to meet workpiece
Requirement, since hydraulic control of the invention makes punch rod meet the variation of three trip segment pressure, to make punching press
Workpiece stiffness out is 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.
Double accumulators of the invention provide the hydraulic control in the electrichydraulic control press of hydraulic power relative to
Hydraulic control in the prior art, can more meet the actual requirement of workpiece deformation, and the workpiece of punching press is better than using existing
The workpiece that the hydraulic control of technology 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 cylinder body when making punch rod backhaul
Generate impact.
The pressure and power of hydraulic control are provided (the first accumulator and the second accumulator) by two accumulators, and first
Accumulator and the second accumulator are respectively pressure and feeding power needed for three trip segments of punch rod provide workpiece, accumulator
The pressure that the pressure ratio oil pump of offer provides is more stable, to keep the workpiece stability processed good, interchangeability is higher.
Detailed description of the invention
Fig. 1 provides the structural schematic diagram of the electrichydraulic control press of hydraulic power for double accumulators of the invention.
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；The first accumulator of 6-；The first control piper of 7-；The second control piper of 8-；9- third connecting pipe；10- first is controlled
Unit；The second control unit of 11-；12- third control unit；The 4th control unit of 13-；14- first piston；15- second piston；
16- second connecting rod；17- path chamber；18- major diameter chamber；Chamber in the middle part of 19-；20- executes cylinder body；21- executes piston；22- punching
Compression bar；23- backhaul control-rod；24- left chamber；25- right chamber；26- buffer chamber；27- buffer spring；The first protruding portion of 28-；
29- mandril；30- first connecting rod；The second protruding portion of 31-；32- trigger switch；33- fuel tank；34- throttle valve；35- damper piston；
36- third accumulator；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 spring；The 4th connecting pipeline of 43-；The second accumulator of 44-.
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 the electrichydraulic control press that double accumulators offer hydraulic power of the invention is provided, introduces be stamped first
Several trip segments of the punch rod 22 (or pressure head) of the process of workpiece Pressing Deformation and stamped workpieces in entire punching course
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
Double accumulators of power provide the electrichydraulic control press of hydraulic power.
As shown in Figure 1, embodiment of the invention discloses a kind of double accumulators to provide the electrichydraulic control pressure of hydraulic power
Machinery is used for stamped workpieces, including executing agency and provides pressure for executing agency and control the hydraulic control of executing agency
Mechanism；Wherein: executing agency includes executing cylinder body 20, setting to divide in execution cylinder body 20 and by execution cylinder body 20 for left chamber 24
The rushing for stamped workpieces for connecting with the execution piston 21 of right chamber 25 and with execution piston 21 and being stretched out from left chamber 24
Compression bar 22, punch rod 22, which has, is fed to the first stroke section contacted with workpiece, by the of workpiece punching press to initial deformation state
Two trip segments and by the stamping forming third trip section of workpiece；Hydraulic control includes: the first accumulator 6 and the second accumulation of energy
Device 44, the pressure of the pressure of hydraulic oil provided by the first accumulator 6 less than hydraulic oil provided by the second accumulator 44；The
One, two, three fluid pressure line, the first fluid pressure line 1 are connect with the first accumulator 6, the second fluid pressure line 2 and the second fluid pressure line 2
It is connect with the second accumulator 44；First control unit 10 controls the first fluid pressure line 1 and the according to the trip segment of punch rod 22
The on-off of two fluid pressure lines 2 and right chamber 25, so that the first fluid pressure line 1 is logical when punch rod 22 is when first stroke section is fed
The first connecting pipeline 4 is crossed to be connected to right chamber 25, when punch rod 22 is fed to second stroke section from first stroke section, the second liquid
Pressure pipe road 2 is connected to by the first connecting pipeline 4 with right chamber 25；Booster body comprising variable diameter plunger shaft, setting are living in variable diameter
Fill in chamber diameter segment in first piston 14, be arranged in the larger-diameter section of variable diameter plunger shaft second piston 15,
It is fixed on the first connecting rod 30 stated on first piston 14 and is fixed in second piston 15 and is oppositely arranged with first connecting rod 30
Second connecting rod 16, wherein variable diameter plunger shaft is divided into path chamber 17, major diameter chamber by first piston 14 and second piston 15
18 and middle part chamber 19, first connecting rod 30 and second connecting rod 16 be located in middle part chamber 19, third fluid pressure line 3 leads to major diameter
Chamber 18, path chamber 17 are connected to by the second connecting pipeline 5 with right chamber 25；Second control unit 11 is arranged in third
On fluid pressure line 3, the second control unit 11 controls the on-off of third fluid pressure line 3 according to the trip segment of punch rod 22, so as to work as
When punch rod 22 is fed to third trip section from second stroke section, third fluid pressure line 3 is connected；Hydraulically-damped control mechanism,
It is buffered in cylinder body including being fixed on the buffering cylinder body of the end of first connecting rod 30, being fixed on the end of second connecting rod 16 and protrude into
Damper piston 35, wherein damper piston 35 and buffering cylinder body surround a buffer chamber 26, are provided in buffer chamber 26 for supporting
By the buffer spring 27 of damper piston 35, buffer chamber 26 is connected to by throttle valve 34 with third accumulator 36, middle part chamber 19
It is connected to third accumulator 36, the highest of third accumulator 36 limits pressure of the pressure less than the second pipeline；Backhaul pressure-keeping mechanism,
It is used for when punch rod 22 is by workpiece punch forming backhaul, and backhaul pressure-keeping mechanism makes right chamber 25 have predetermined pressure.
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,
The electrichydraulic control press that double accumulators provide hydraulic power further includes trigger mechanism, and trigger mechanism includes changing with Mechanical Driven
It is connected to the spool of valve and the mandril 29 stretched out towards 22 direction of punch rod and the first protruding portion 28 for being arranged in punch rod 22,
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 from second stroke
When section is fed to third trip section, the first protruding portion 28 pushes against mandril 29 so that mandril 29 drives the spool of Mechanical Driven reversal valve
First position is switched to 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, double accumulators of the invention are described below and provide
The electrichydraulic control press course of work of hydraulic power.
Before introducing double accumulators and the electrichydraulic control press course of work of hydraulic power is provided, introduce first
Double accumulators of the invention provide the pressurization principle and fluid power of the booster body in the electrichydraulic control press of hydraulic power
The working principle of buffer control mechanism, to better understand the electrichydraulic control press course of work of the invention.
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 third accumulator simultaneously
36 provide the hydraulic oil of certain pressure into buffer chamber 26, so that first connecting rod 30 and second connecting rod 16 be made to keep relatively quiet
Only, buffer spring 27 is in lesser compressive state, at this point, hydraulic in major diameter chamber 18, path chamber 17, middle part chamber 19
The pressure and buffer spring 27 of oil make first piston 14 and second piston to the thrust of first connecting rod 30 and second connecting rod 16
15 are in static and equilibrium state, and first piston 14 and second piston 15 are regarded as generally in equilibrium state.When to major diameter chamber
18 when being passed through the higher hydraulic oil of relative pressure (pressure provided greater than third accumulator 36), the hydraulic oil in major diameter chamber 18
For pushing and pressing second piston 15 to make balance break, second piston 15 drives damper piston 35 towards first piston under the action of thrust
14 is mobile, and the movement of simultaneous buffering piston 35 makes the hydraulic oil in buffer chamber 26 constantly pass through throttle valve 34 to third accumulator
Energy is filled in 36 punchings, and buffer spring 27 is constantly compressed, and in the process, first connecting rod 30 and second connecting rod 16 are always towards path chamber
17 is mobile, but so that two connecting rods be made to be formed, differential namely second is living greater than first connecting rod 30 for the movement speed of second connecting rod 16
Plug 15 forms differential with first piston 14, until after being compressed completely to buffer spring 27, the first company is just synchronous with second connecting rod 16
Movement namely second piston 15 are moved synchronously with first piston 14, at this time the stress balance of first piston 14 and second piston 15
It establishes again.According to the above-mentioned pressurization principle to booster body, when first piston 14 and second piston 15 are in equilibrium state
When, the pressure P1 of the hydraulic oil in path chamber 17 could be greater than the pressure P2 of the hydraulic oil in major diameter chamber 18, slow in fluid power
When rushing the original state of control mechanism, smaller pressure in major diameter chamber 18 is Pa, to make the pressure in path chamber 17
Pb, when be passed through into major diameter chamber 18 pressure be Pa ' (Pa ') Pa) hydraulic oil when, between first piston 14 and second piston 15 because
Provided with hydraulically-damped control mechanism, so that there is no be increased to equilibrium-like at once for the hydraulic fluid pressure in the path chamber 17 made
Pb ' corresponding with Pa ' when state, and slowly rising since Pb, until buffer spring 27 is fully compressed, first piston 14 and the
Two pistons 15 move synchronously after reaching new balance, and 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 of double accumulators offer hydraulic power of the invention is used for presser
The executive component of part is punch rod 22, and hydraulic control is used to provide power for punch rod 22 and make stamping parts in above three
Corresponding pressure is applied to workpiece in 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 hydraulic oil of the first fluid pressure line 1 is (in first fluid pressure line 1
Hydraulic oil because being connect with the first accumulator 6, pressure is lower, and pressure provided by the first accumulator 6 is less than the second accumulator 44
Provided pressure) pass through hydraulic directional valve (as first control unit 10), into the first connecting pipeline 4, connect by first
Enter right chamber 25 behind siphunculus road 4, hydraulic oil enters after right chamber 25 because pressure itself is lower, to only provide for punch rod 22
Feed motion (certainly, can also provide pressure lesser power) simultaneously, to make punch rod 22 constantly feed and then connect with workpiece
Touching, after punch rod 22 and workpiece contact, workpiece generates reaction force to punch rod 22 to resist the flexible deformation of workpiece, punching press
Counter-force is passed to and executes piston 21 by bar 22, so that the pressure of the hydraulic oil in right chamber 25 be made to increase, the pressure of the increase is logical
The right end that the second control piper 8 is transferred to the spool of hydraulic directional valve (as first control unit 10) is crossed, so that driving is surged
The spool of reversal valve (as first control unit 10) 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 (second fluid pressure line 2 because being connect with the second accumulator 44, in
Hydraulic oil pressure it is higher with respect to the pressure of the first fluid pressure line 1, pressure provided by the first accumulator 6 be lower than the second accumulation of energy
Pressure provided by device 44, and pressure provided by second fluid pressure line 2 can make punch rod 22 make workpiece to workpiece punching press
Generate the flexible deformation of original state, subsequent detailed) it begins through hydraulic directional valve (as first control unit 10) and enters the
A connecting pipe road 4, and right chamber 25 is entered by the first connecting pipeline 4, since the pressure in the second fluid pressure line 2 is greater than first
Pressure in fluid pressure line 1, and the pressure of the hydraulic oil in right chamber 25 is equal to the pressure in the second fluid pressure line 2, also, will
The pressure of second fluid pressure line 2 is arranged to that the hydraulic oil of the pressure is made to push against execution piston 21, makes punch rod 22 to workpiece
Pressure meets the flexible deformation that original state occurs for workpiece, so that punch rod 22 occurs that workpiece just
The flexible deformation of beginning state, to complete second stroke section, workpiece completes 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 the institute of third accumulator 36 to the hydraulic oil of third fluid pressure line 3
The pressure of offer, 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
Power) 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, buffering
Piston 35 makes the hydraulic oil in buffer chamber 26 enter third accumulator 36 by throttle valve 34 under the driving of second piston 15,
And buffer spring 27 is compressed simultaneously, in the process, first piston 14 and second piston 15 are mobile towards path chamber 17, only
The movement speed of second piston 15 be greater than first piston 14 movement speed, thus formed it is differential, at this point, with first piston 14
It is gradually risen with the pressure of the continuous movement of second piston 15, the hydraulic oil in path chamber 17, to make punch rod 22
Triple-travel section constantly increases the pressure of workpiece, after buffer spring 27 is fully compressed, first piston 14 and second piston 15
Start to move synchronously, 15 stress balance of first piston 14 and second piston, so that the pressure of the hydraulic oil in path chamber 17
Power reaches maximum, so that punch rod 22 be made to 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 cylinder body 20 is executed when 22 backhaul of punch rod.
Another inventive point of the invention is: the pressure and power of hydraulic control provide (by two accumulators
One accumulator 6 and the second accumulator 44), three trip segments of the first accumulator 6 and the second accumulator 44 respectively punch rod 22
Pressure and feeding power needed for providing workpiece, the pressure that the pressure ratio oil pump that accumulator provides provides is more stable, to make to add
The workpiece stability that work goes out is good, and interchangeability is higher.
Double accumulators of the invention provide the hydraulic control in the electrichydraulic control press of hydraulic power relative to existing
There is the hydraulic control in technology, can more meet the actual requirement of workpiece deformation, the workpiece of punching press is better than utilizing existing skill
The workpiece that the hydraulic control of art stamps out.
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 double accumulators provide the electrichydraulic control press of hydraulic power, it to be used for stamped workpieces, which is characterized in that including
Executing agency and pressure is provided for the executing agency and controls the hydraulic control of the executing agency；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:
The pressure of first accumulator and the second accumulator, hydraulic oil provided by first accumulator is less than second accumulation of energy
The pressure of hydraulic oil provided by device；
First, second and third fluid pressure line, the first fluid pressure line are connect with first accumulator, the second fluid pressure line and the second liquid
Pressure pipe road is connect with second accumulator；
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 third accumulator, the middle part chamber is connected to the third accumulator, and the third accumulator is most
Height limits the pressure that pressure is less than 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. double accumulators according to claim 1 provide the electrichydraulic control press of hydraulic power, which is characterized in that institute
Stating first control unit is hydraulic directional valve, and the spool of the hydraulic directional valve, which has, makes first fluid pressure line by first
Connecting pipeline be connected to the right chamber and the first position that simultaneously disconnects second fluid pressure line and the right chamber with
And second fluid pressure line is made to be connected to the right chamber by the first connecting pipeline and make first fluid pressure line simultaneously
The second position disconnected with the right chamber；The spool of the hydraulic directional valve passes through first be connected to respectively with the left chamber
The control of control piper and the second control piper being connected to the right chamber switches between the first position and the second position, with
Make when the punch rod is fed to second stroke section from first stroke section, the spool of the hydraulic directional valve is cut by first position
Shift to the second position.
3. double accumulators according to claim 1 provide the electrichydraulic control press of hydraulic power, which is characterized in that institute
Stating the second control unit is Mechanical Driven reversal valve, and the spool of the Mechanical Driven reversal valve, which has, is connected third fluid pressure line
First position and the second position that disconnects the third fluid pressure line, double accumulators the electro-hydraulic of hydraulic powers is provided
Controlling press further includes trigger mechanism, and the trigger mechanism includes that simultaneously court is connect with the spool of the Mechanical Driven reversal valve
The mandril that the punch rod direction is stretched out and the first protruding portion being arranged in the punch rod, first protruding portion is in institute
The distance for extending third trip section in the direction of feed of punch rod is stated, to be fed to third from second stroke section when the punch rod
When trip segment, first protruding portion push against the mandril so that the mandril drive the spool of the Mechanical Driven reversal valve from
The second position switches to first position.
4. double accumulators according to claim 2 provide the electrichydraulic control press of hydraulic power, which is characterized in that
The backhaul pressure-keeping mechanism includes pressure maintaining cylinder body, setting in the intracorporal pressure maintaining piston of the holding tank, and the pressure maintaining piston is by institute
Pressure maintaining cylinder body is stated respectively into left pressure maintaining chamber and right pressure maintaining chamber, is provided with pressure maintaining spring, the right side in the right pressure maintaining chamber
The check valve that pressure maintaining chamber is set with predetermined conducting pressure by one is connect with fuel tank, and the electrichydraulic control press further includes
Trigger switch, the third control unit being electrically connected with the trigger switch and the 4th control unit are also set on the execution piston
It is equipped with the backhaul control-rod for stretching out the right chamber, for triggering the trigger switch is provided on the backhaul control-rod
Two protruding portions, the third control unit are arranged on first connecting pipeline, and three control unit has and makes described the
The first state of a connecting pipe road conducting and make that first connecting pipeline disconnects and connect the right chamber by the 4th
Second state on siphunculus road and the left pressure maintaining chamber, the 4th control unit are arranged in first control piper
On, the 4th control unit has the first state for making the first control piper conducting and makes first control piper
The second state disconnected, when the punch rod completes third trip section, second protruding portion trigger the trigger switch with
So that the third control unit is switched to the second state by its first state, switches the 4th control unit by first state
To the second state；First fluid pressure line is connected to by third connecting pipe with the left chamber.
5. double accumulators according to claim 4 provide the electrichydraulic control press of hydraulic power, which is characterized in that institute
Stating third control unit and the 4th control unit is solenoid directional control valve.
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| CN201611033968.XA CN106368993B (en) | 2016-11-22 | 2016-11-22 | Double accumulators provide the electrichydraulic control press of hydraulic power |
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| CN201611033968.XA CN106368993B (en) | 2016-11-22 | 2016-11-22 | Double accumulators provide the electrichydraulic control press of hydraulic power |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| AT349856B (en) * | 1976-04-14 | 1979-04-25 | Balcke Duerr Ag | DEVICE FOR EXPANDING PIPE END WITHIN A PIPE DISC |
| 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 |
| EP1279488B1 (en) * | 2000-03-06 | 2010-06-30 | Amada Company, Ltd. | Device and method for controlling stop of hydraulic press and device and method for detecting trouble of speed selector valve |
| CN201389592Y (en) * | 2009-05-08 | 2010-01-27 | 九江财兴卫浴实业有限公司 | Hydraulic expansion machine |
| 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: 20190313 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 B105 room, Binhu tower, Central Lake Road, Hexi District, Tianjin. Applicant before: Tianjin Shao Hui Technology Co., Ltd. |
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