CN109854551A - For molding machine, particularly for the hydraulic system of die casting machine - Google Patents
For molding machine, particularly for the hydraulic system of die casting machine Download PDFInfo
- Publication number
- CN109854551A CN109854551A CN201811444943.8A CN201811444943A CN109854551A CN 109854551 A CN109854551 A CN 109854551A CN 201811444943 A CN201811444943 A CN 201811444943A CN 109854551 A CN109854551 A CN 109854551A
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- Prior art keywords
- valve
- pressure
- hydraulic system
- storage tank
- outflow
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/32—Controlling equipment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/2015—Means for forcing the molten metal into the die
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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
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
- F15B11/032—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters
- F15B11/0325—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters the fluid-pressure converter increasing the working force after an approach stroke
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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
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
- F15B11/036—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of servomotors having a plurality of working chambers
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
- F15B2211/214—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being hydrotransformers
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30505—Non-return valves, i.e. check valves
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
- F15B2211/31552—Directional control characterised by the connections of the valve or valves in the circuit being connected to an output member and a return line
- F15B2211/31558—Directional control characterised by the connections of the valve or valves in the circuit being connected to an output member and a return line having a single output member
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
- F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
- F15B2211/31576—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having a single pressure source and a single output member
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
- F15B2211/40507—Flow control characterised by the type of flow control means or valve with constant throttles or orifices
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
- F15B2211/41554—Flow control characterised by the connections of the flow control means in the circuit being connected to a return line and a directional control valve
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/625—Accumulators
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/775—Combined control, e.g. control of speed and force for providing a high speed approach stroke with low force followed by a low speed working stroke with high force, e.g. for a hydraulic press
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/86—Control during or prevention of abnormal conditions
- F15B2211/8609—Control during or prevention of abnormal conditions the abnormal condition being cavitation
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The present invention relates to a kind of hydraulic systems, the hydraulic system is arranged for molding machine, especially it is used for die casting machine, and the hydraulic system includes pressure medium source, storage tank, ejection cylinder and outflow valve, the ejection cylinder has piston, piston rod and the first pressure room worked on the removal direction of the piston rod, it can be from the pressure medium source to the first pressure room discharge pressure medium, the outflow valve has high voltage interface and the low-voltage interface that can connect with the high voltage interface and described flows out on the annular second pressure room that valve is worked using the immigration direction that the high voltage interface is connected to the piston rod along the ejection cylinder, and fluid path is guided from its low-voltage interface to the storage tank.
Description
Technical field
The present invention relates to a kind of hydraulic system, the hydraulic system is arranged for molding machine, particularly is used for die casting machine,
And the hydraulic system includes that pressure medium source, storage tank, ejection cylinder and outflow valve, the ejection cylinder have piston, piston
Bar and there is the first pressure room worked on the removal direction of the piston rod, it can be from the pressure medium source to institute
State first pressure room discharge pressure medium, the low pressure that the outflow valve has high voltage interface and can connect with the high voltage interface
The interface and outflow valve is connected to using the high voltage interface and is worked along the immigration direction of the piston rod of the ejection cylinder
Annular second pressure room on, and fluid path is guided from its low-voltage interface to the storage tank.
Background technique
This hydraulic system for die casting machine for example by 19 49 360 A1 of DE, by 10 2,004 023 150 B4 of DE or
As known to 10 2,005 035 170 A1 of DE.In the hydraulic system as known to latter document, outflow valve is continuously adjustable
Pressure medium can be expressed to storage tank pipeline and storage from the second pressure room of ejection cylinder by the outflow valve by 2/2 direction valve
In case, using 2/2 direction valve at the first pressure room of pressure-loaded ejection cylinder, it can control and be squeezed from second pressure room
The pressure medium amount of extrusion and thus, it is possible to control the speed of the piston of ejection cylinder and piston rod.
In the hydraulic system for being used for die casting machine as known to 19 49 360 A1 of DE, outflow valve is with direction controlling
The direction valve of valve (Umsteuerschieber), can by the outflow valve by pressure medium from the second pressure room of ejection cylinder
It is expressed in storage tank pipeline and storage tank, can will also be pumped by the direction valve and be connect with the second pressure room of ejection cylinder.In root
In hydraulic system according to 10 2,004 023 150 B4 of DE, the pressure medium squeezed out from the annular space of multiplication cylinder passes through
Identical outflow valve from the pressure medium squeezed out in the second pressure room of ejection cylinder as flowed.Flowing out valve can be different
Open to degree.
Occurs very big pressure medium volume flow in the hydraulic system for machine, wherein the piston of hydraulic cylinder and work
Stopper rod is also moved during operation with very big speed, this such as melts molding machine in die casting machine, touching
(Thixoformingmaschine) and in injection molding machine mold is arrived into liquid or pulpous state material guidance (so-called injection)
It is such case when middle.In injection until the speed of 10 m/s is moved.According to the size of ejection cylinder herein with until
30000 l/min flow into the first pressure room of ejection cylinder, and with until 18000 l/min from the second pressure room of ejection cylinder
Outflow.In general, storage tank is located at the side of machine set relatively, so that long (until 15 m) and thickness (until 300 mm
Diameter) pipeline must be installed in entire machine length.
It is usually very big to lead to storage tank and flowing velocity in storage tank, so that generating vortex, air passes through vortex and pressure
Power media mixing.The bubble rise time of the usually HFC liquid used in the hydraulic system for molding machine compares mineral
Oil is four times high.It is tranquil using having in order to have air before liquid is again sucked into for rising the necessary time
The very big storage tank in section (Beruhigungsstrecken).The bubble for not separating (abscheiden) is pressed under stress
Contracting or dissolution are in the medium.In the low-down position of static pressure, air expands to obtain very fast (gas cavities).It may be damaged herein
Component.
It shrinks the cross section that especially fast and static pressure corresponds to the place of the steam pressure of the temperature of liquid in liquid flowing
Place, pressure fluid are evaporated due to low static pressure and form steam bubble.If these bubbles reach relatively slow with higher static pressure
Pressure fluid speed position, then implosion can occur for steam bubble (steam hole).Here, they go out from component borehole blasting
(sprengen) the smallest material granule, such as outflow valve control edge on.
Hydraulic system with the given feature of beginning should be designed to need smaller construction space and improve system
The service life of component.
Summary of the invention
This is accomplished by the following way, and flowed friction is arranged in from outflow valve and guides into the fluid path of storage tank, and
In the upstream of flowed friction, low pressure memory is connected on the fluid path, so that at least temporarily flowing towards the storage tank
Volume flow be less than simultaneously by the volume flow of the outflow valve flow, and described in poor between described two volume flows flow to
Low pressure memory.
In hydraulic system according to the present invention, injection when from the second pressure room of ejection cylinder squeeze and pass through stream
The pressure medium amount of valve flow is directly accommodated by low pressure memory out, wherein flowed friction upstream and in low pressure memory
Middle pressure rises to low numerical value.Low pressure memory is so designed, and is being sprayed so as to accommodate whole or almost all
The pressure medium amount squeezed from the ejection cylinder during penetrating by flowing out valve.Pressure in low pressure memory herein slightly on
It rises, however should be kept as low.In injection period and then only less volume flow is reached by flowed friction towards storage tank outflow
Several seconds, so that the pipeline in flowed friction downstream can be small through flow cross section.Due to the pressure in low pressure memory, so that casting
Although the pressure made in the second pressure room of cylinder is higher than the pressure in the known hydraulic system for die casting machine in injection.
Higher pressure however only indistinctively reduce pressing force.In the low pressure memory also acted in second pressure room for example
The pressure of 5 bar to 8 bar due to ejection cylinder 2 to 1 common area relationship and so act on: that is, seemingly first pressure
Pressure ratio usual situation in room wants low 2.5 bar to 4 bar.
In hydraulic system according to the present invention, due to low volume flow in injection period and later, in flowed friction
The storage tank pipeline extended between storage tank can be designed to have small through flow cross section, be less than outflow valve low-voltage interface and
The through flow cross section in outflow pipeline between low pressure memory.Since the flowing velocity towards storage tank is smaller, in pressure medium
Middle to generate less vortex, so that less air enters in pressure medium, and the risk of cavitation therefore in system is lower.
Since tranquil section can be made to shorten and less air must be discharged, storage tank volume can reduce.In outflow valve
Storage tank side is commonly applied the low pressure of the size of such as 5 bar to 8 bar.As a result, pressure is not less than steam pressure, so that will not
There is steam hole.Obtain compressed air bubble expansion slower.Thereby reduce gas cavities.It is total as a result,
For, it flows out valve and the service life of existing outflow valve group is improved when necessary, institute is installed or be arranged to outflow valve
It states in outflow valve group or locates.
Preferably, low pressure memory is tightened to low pressure in advance, wherein the low pressure be in 2 bar between 8 bar, preferably
Ground is in 4.5 bar between 5.5 bar.It thus ensures in outflow pipeline and thus straight on the low-voltage interface of outflow valve
It connects and there is certain pressure after it is opened.
The piston memory that low pressure memory is pre-tightened preferably by gas.
The through flow cross section of storage tank pipeline can be so selected, so that storage tank pipeline itself works as throttle mechanism
And there is blockage effect for the pressure medium of outflow, and pressure medium is extruded in low pressure memory.Here, in the presence of
Between in low pressure memory and thus in the outflow pipeline between low pressure memory and the through flow cross section of storage tank pipeline
Correlation.Lesser between the low pressure present in low pressure memory and the through flow cross section of storage tank pipeline is hardly deposited
Correlation be thus achieved, i.e., be connected to pre-tighten after the low-voltage interface of outflow valve and valve and be connected to low pressure memory
On the outflow pipeline extended between outflow valve and preload valve.Pre-tightening valve can be used for, and at least preload pressure is present in outflow always
In pipeline, pre-tightens valve and be adjusted to the preload pressure.The conscious caused resistance to the storage tank pipeline of storage tank is guided from preload valve
Plug effect is unnecessary to this.If low pressure drops to preload pressure, valve closing is pre-tightened.
Pre-tightening valve preferably has closure body and along closing direction load institute as towards storage tank is open in a simple manner
The check-valves for stating the closing spring of closure body, can adjust preload pressure by the closing spring and lead in pressure medium flow
The smallest pressure drop crossing the check-valves and occurring, the check-valves are opened under the preload pressure.If from check-valves
The storage tank pipeline guided towards storage tank does not have significant ponding, then when the low pressure in low pressure memory is higher than preload pressure
When, check-valves opens wide completely.Then pass through low pressure towards the pressure medium amount that storage tank flows by check-valves and passes through non-return
The unlatching cross section (ffnungsquerschnitt) of valve determines.If low pressure drops to preload pressure.
The closing spring of check-valves is preferably so pre-tightened so that the opening pressure of check-valves almost with low pressure memory
Preload pressure is identical.It means that even if in the case where being not provided with other valves, the low pressure memory when pre-tightening valve and closing
Also it is at least almost drained, and under given size, a large amount of pressure medium amounts can be accommodated in injection next time.If
Low pressure memory is tightened to the pressure than pre-tightening valve somewhat higher in advance, then when pre-tightening valve closing, the low pressure memory is complete
Emptying.The resolution element of low pressure memory sticks on stop part in this case.For example, the piston of piston memory reclines
It is covering.On the contrary, being still emptied completely in low pressure memory if low pressure memory is tightened to pressure more lower than preload valve in advance
Before, it pre-tightens valve just to have been switched off, and the backstop of element can be prevented separation.
In order on the one hand by completely open preloads valve have volume flow, by which ensure that low pressure memory up under
Primary injection all largely empties, and in order on the other hand avoid hardy encountering due to resolution element in backstop and
Service life is reduced, can be parallel to and pre-tighten valve arrangement nozzle.Then the preload pressure of low pressure memory is selected to be less than
Pre-tighten the preload pressure of valve.Subsequent low pressure memory passes through open preload valve and nozzle emptying first, until memory pressure
Drop to valve preload pressure.If memory pressure is decreased until valve preload pressure, valve closing is pre-tightened.Other pressure mediums
Nozzle is exited through from low pressure memory now and flows to storage tank, so that low pressure memory is emptied completely.
In injection, ejection cylinder is also referred to as booster-generally by means of multiplication cylinder-on its bottom side and is loaded high pressure.Multiplication
Cylinder have primary piston and relative to primary piston on its acting surface lesser secondary piston, wherein in the side of primary piston
Pressure medium can be expressed in storage tank by upper formation annular space from the annular space by outflow valve.Advantageously, the stream
The low-voltage interface of valve is now connect on low pressure memory out.
It can be preferably by the outflow valve that pressure medium is expressed in storage tank from the second pressure room of ejection cylinder by it
One outflow valve, and pressure medium can be expressed to the outflow valve in storage tank from the annular space of multiplication cylinder by it is second
Valve is flowed out, so that the second pressure room of ejection cylinder is unrelated relative to outflow pipeline with the through flow cross section of the annular space of multiplication cylinder
Ground is controlled each other.
Single outflow valve or multiple outflow valves are preferably the valve of continuously adjustable.
The embodiment of the stage of the filling of mold and the hydraulic system according to the present invention for die casting machine is shown in the accompanying drawings
Out.The present invention will be described in greater detail now by means of the diagram of the attached drawing.
Detailed description of the invention
Wherein:
Fig. 1 shows the strong schematical feelings in initial position when starting die casting workpiece of the die casting machine with casting cylinder
Condition；
Fig. 2 shows the roots during the cast pistons by being moved by casting cylinder close the pre-filling stage after filling opening
According to the die casting machine of Fig. 1；
According to the die casting machine of Fig. 1 when Fig. 3 is shown at the end of pre-filling stage and the mold filling stage starts；
Fig. 4 shows the die casting machine according to Fig. 1 in packing stage, and
Fig. 5 shows the embodiment as hydraulic wiring arrangement (Schaltanordnung).
Specific embodiment
According to Fig. 1 to 4, die casting machine includes ejection cylinder, the ejection cylinder hereinafter because it is applied in die casting machine and by
Cylinder 10 is referred to as cast, and the ejection cylinder is configured to cylinder with differential effect and has piston 11 and piston rod 12, the piston rod is from work
The side of plug 11 begins to pass the internal stretch of casting cylinder and comes out outward covering the shell 13 from casting cylinder.Pass through piston
11, the pressure chamber 15 of the bar side of the pressure chamber 14 and annular of wholly cylindrical bottom side divides each other in the inside of casting cylinder 10
It opens.
Cast pistons 16 are fixed on piston rod 12, the cast pistons are in construction in injection sleeve (Schussbuchse)
It can linearly be moved in spray chamber (Schusskammer) 18 in 17.Filling for liquid or pulpous state moulding material
(the Einf ü ll ffnung) 19 that be open is located in injection sleeve 17, and workpiece to be formed will be made of the moulding material.Injection set
Cylinder 17 and mold (Form) 20 fits together (zusammengebaut), forms mold cavity 21 by it, the forming is empty
Chamber is used to manufacture workpiece filled with moulding material, and by it come the shape of previously given workpiece.Casting channel 22 is from spray
Chamber 18 is penetrated to be directed in mold cavity 21.
According to Fig. 1, casts cylinder 10 and cast pistons 16 are in initial position, piston rod 12 moves completely in the initial position
Enter (einfahren).By filling open in the shown position of cast pistons 16 opening 19, for needed for Forming Workpiece
The amount of moulding material has been filled into spray chamber.It now begins to the first stage of press casting procedure, be also referred to as pre-filling stage,
Cast pistons slowly move forward and move past and close filling opening 19 in the stage.Then the state reached is in Fig. 2
It shows.Then, cast pistons are accelerated, and are eventually arrived at shown in Fig. 3 by the further movement of cast pistons 16 simultaneously
State, moulding material is present on gate (Formanschnitt) in this state.
Now hereinafter also referred to the mold filling stage, press casting procedure second stage quickly to the greatest extent may be used with cast pistons 16
Speed that can be constant carries out.During the second stage, mold utilizes the moulding material with the high flowing velocity of moulding material
It is filled.
All areas of mold cavity 21 are compressed to high pressure in phase III, also referred to as packing stage, moulding material
Also compensating material is lost in domain and herein.The high pressure needed for the packing stage can be in the pressure chamber 14 of casting cylinder
It is either also generated directly by means of high pressure accumulator or pump by means of booster (Druck ü bersetzer), the booster is right
After be counted as high-voltage power supply.
Include visible casting cylinder 10, casting in Fig. 1 to 4 for the hydraulic system of die casting machine shown in Fig. 5
Cylinder has piston 11, piston rod 12, shell 13 and the pressure chamber 14 of bottom side and the pressure chamber 15 of bar side.Exist as pressure source
Have high pressure accumulator 30, multiplication cylinder (Multiplikatorzylinder) 31- be also referred to as booster-and its stroke hold
29,4/3 direction valve 32 of adjustable hydrostatic pump is connected on the hydraulic pump using pump interface P in product (Hubvolumen).
Multiplication cylinder 31 possesses the primary piston 33 with major diameter and the secondary piston 34 with primary piston assembling, the secondary
Piston has the lesser diameter of diameter relative to primary piston.The diameter of secondary piston 34 is less than or equal to the work of casting cylinder 10
The diameter of plug 11.Multiplication cylinder 31 and casting cylinder 10 so assemble in alignment each other, so that the secondary piston 34 of multiplication cylinder 31 is slightly
It hermetically extend into the pressure chamber 14 of casting cylinder 10.Wholly cylindrical pressure chamber 35 is in the primary piston 33 of multiplication cylinder 31
Side on.Annular space is formed by the primary piston and secondary piston 34 on the other side of primary piston 33
(Ringraum) 36.
Since high pressure accumulator 30, can by valve 40 built in 2/2 changeable direction, pass through the pressure of multiplication cylinder 31
Room 35 and between pressure chamber 35 and pressure chamber 14 and will pressure towards the open check-valves 41 in pressure chamber 14 by being arranged in
Power media is conveyed to the pressure chamber 14 of casting cylinder.Valve 40 built in 2/2 direction have main piston 42, the main piston can open (
Fluidly connecting ffnen) and between locking (abzusperren) interface A and interface B, the pressure chamber 35 for the cylinder that doubles and non-return
Valve 41 is connected on the interface A.Main piston is loaded the pressure on interface B on annular surface 43 along opening direction and in
Between rounded face 44 on be loaded pressure on interface A.With the summation same size of annular surface 43 and rounded face 44 backward
Control plane 45 on, main piston 42 can be loaded presence (anstehen) in the pressure on interface B or be unloaded along closing direction
Go (entlasten) pressure.This point by means of can solenoid-operated pilot valve (Pilotventils) 46 control, the guide
Valve have connect with the control space backward being adjacent on control plane 45 interface, with the interface B interface connecting and with storage
The interface of case connection.It is mounted with weak closing spring 47 in control space backward, which applies along closing direction
In power to main piston 42.
In the resting position of pilot valve 46 shown in, control plane 45 backward is removed pressure, keeps main piston 42 logical
Pressure that is being present on interface A or being present on interface B valve 41 built in the promotion from its seat and 2/2 direction is crossed to open.
In the position through manipulating of pilot valve 46, control plane backward is loaded the pressure being present on interface B and along closing side
The pressure being loaded to the power for being loaded closing spring 47 and on annular surface 43 on interface B, and along opening in rounded face
Direction is loaded the pressure for the pressure that can be not more than on interface B being present on interface A.Due to closing spring 47 and therefore mistake
The power of amount is acted on along closing direction, and main piston 42 is made to close or remain turned-off.
Check-valves 41 is encased in the unit being made of the primary piston 33 and secondary piston 34 of multiplication cylinder, so that pressure is situated between
Matter begins through the pressure chamber 14 that the channel in the unit flows to ejection cylinder 10 from high pressure accumulator 30.
The annular space 15 of ejection cylinder with can proportion adjustment electricity hydraulically pre-control outflow valve 50 high voltage interface 51
Connection, the outflow valve also have low-voltage interface 52 other than high voltage interface, and outflow pipeline 53 is connected to the low-voltage interface
On, which guides to the check-valves 54 for pre-tightening valve is used as, which opens towards storage tank 55.Check-valves 54, which has, to close
Closure 56 and closing spring 57, the closing spring apply force on closure body along closing direction, and may be corresponding on closure body
It is equivalent (Druck quivalent) in the pressure of such as 5 bar.When on its outlet end of the pressure ratio on the arrival end in check-valves
Pressure high 5 bar when, therefore which opens.Storage tank pipeline 58 is guided from the outlet end of check-valves 54 to storage tank 55.
Assuming that there are atmospheric pressures in storage tank pipeline 58, when pressure is 5 bar in outflow pipeline 53, therefore the check-valves 54 is beaten
It opens.
It is parallel to check-valves 54, choke block 60 is arranged between outflow pipeline 53 and storage tank pipeline 58.
Low pressure memory 65 is connected on outflow pipeline 53, which is the piston storage with piston 66
Device, the piston separate gas side and the hydraulic fluid side connecting with outflow pipeline 53 in the inside of low pressure memory.Low pressure storage
It is about 5 bar that device, which is pre-tightened,.It means that piston 66 is placed in pressure in the case where the pressure of the hydraulic fluid side less than 5 bar
Under gas extrusion to stop part on.
Double cylinder annular space 36 with can proportion adjustment electricity hydraulically pre-control second outflow valve 70 high-voltage connecting
Mouth 71 connects, which also has low-voltage interface 72, using the low-voltage interface, the outflow other than high voltage interface
Valve is connected to outflow pipeline 53 and is therefore also connected on low pressure memory 65.
4/3 direction valve 32 also has storage tank interface T, customer interface A and customer interface B other than pump interface P,
Using the storage tank interface 4/3 direction valve is connect with storage tank 55, makes 4/3 direction using the customer interface
Valve is made by connecting towards the open check-valves 75 of high pressure accumulator 30 with high pressure accumulator 30 using the customer interface
4/3 direction valve towards the first check-valve 76 of customer interface B locking with the pressure chamber 15 of ejection cylinder 10 by connecting simultaneously
And by equally being connect towards the second check-valve 77 of customer interface B locking with the annular space 34 of multiplication cylinder 31.In direction
The middle position of valve 32, customer interface A and B are unloaded relative to storage tank interface T.Pump interface is locked up.The first side to
In position, customer interface A opens wide (offen) towards pump interface P and customer interface B is opened wide towards storage tank interface T.Phase
Instead, the second side to position in, customer interface B and pump connection and customer interface A connect with storage tank.
It is shown in Fig. 5 and casts the case where cylinder 10 is in its initial position with multiplication cylinder 31 when pre-filling stage starts.
In order to move the piston 11 and piston rod 12 of casting cylinder 10, the electromagnet energization of present pilot valve 46 and thus the pilot valve quilt
It takes in on-position (Schaltstellung), the main piston 42 of valve 40 built in 2/2 direction is backward in the on-position
Control plane 45 be removed pressure.Be present on the lateral interface B of valve 40 built in 2/2 direction from high pressure accumulator 30
Therefore pressure may take main piston 42 in its open position.Pressure in high pressure accumulator may be such as 160 bar.
There are memory pressures in the pressure chamber 14 of casting cylinder 10 and in the pressure chamber 35 of multiplication cylinder 31 now as a result,.Now
This through flow cross section is opened on the outflow valve 50 that can be continuously adjusted, to obtain the desired of the piston rod 12 of casting cylinder
Speed.The piston 33 and 34 of multiplication cylinder 31 does not move, because outflow valve 70 is primarily remain in its lock position.
In order to import the mold filling stage after pre-filling stage, outflow valve 50 is fully opened.Now, for moulding material
The piston 11 and piston rod 12 of injection can accelerate to mold by the power of the generation of the high pressure from high pressure accumulator 30
(Form) in and mobile with high speed.Big volume flow is squeezed out from the pressure chamber 15 of casting cylinder 10, which passes through
Completely it is open outflow valve 50 flowing and ignore by choke block 60 flow to storage tank it is a small amount of in the case where reach low pressure deposit
In reservoir 65.Pressure in low pressure memory 65 reaches the preload pressure on check-valves 54 so that the check-valves open and
Pressure medium is allowed to flow out to storage tank.It is greater than by the volume flow that outflow valve 50 flows and is flowed out by choke block 60 and check-valves 54
Volume flow summation so that low pressure memory 65 is further loaded and terminates in the low pressure memory in the mold filling stage
When in the presence of such as 8 bar low pressure.When packing stage starts, the second outflow valve 70 is more or less beaten to a certain extent
It opens, so that two pistons 33 and 34 of multiplication cylinder 31 start mobile and establish in the pressure chamber 14 of casting cylinder far more than being present in
The pressure of pressure in high pressure accumulator 30.Check-valves 41 is closed immediately.The piston 11 and piston rod 12 for casting cylinder are in pressure maintaining rank
It is still only slowly moved in section, so that the pressure medium amount flowed out out of pressure chamber 15 each chronomere by outflow valve 50
Less than the pressure medium amount flowed by check-valves 54 and choke block 60.Pressure in low pressure memory 65 is therefore in pressure maintaining
It is begun to decline in stage.
It is moved in initial position shown in Fig. 5 to return to cylinder 10 and 31, takes valve 40,50 and 70 to it
It is taken in such position in closed position and by direction valve 32, its customer interface B and pump interface P connects in this position
It connects.The pressure medium conveyed by hydraulic pump 29 passes through direction valve 32 now and two check-valves 76 and 77 flow to the pressure of cylinder 10 and 31
In power room 15 and 36.The pressure chamber 14 and 35 of two cylinders 10 and 31 passes through the direction valve not being shown specifically and storage when returning to mobile
Case connection, so that the return of piston 33 and 34 of the piston 11 and piston rod 12 and the cylinder 31 that doubles of casting cylinder 10 is moved in Fig. 5
Shown in position.
Reference signs list
10 casting cylinders
11 10 piston
12 10 piston rod
13 10 shell
The pressure chamber of 14 10 bottom side
The pressure chamber of 15 10 bar side
16 cast pistons
17 injection sleeves
Spray chamber in 18 17
Filling opening in 19 17
20 molds
21 mold cavities
Casting channel in 22 20
29 hydraulic pumps
30 high pressure accumulators
31 boosters
32 4/3 direction valves
33 31 primary piston
34 31 secondary piston
Wholly cylindrical pressure chamber in 35 31
Annular space in 36 31
Valve built in 40 2/2 directions
41 check-valves
42 40 main piston
Annular surface on 43 42
Rounded face on 44 42
Control plane backward on 45 42
46 pilot valves
47 close spring
50 outflow valves
51 50 high voltage interface
52 50 low-voltage interface
53 outflow pipelines
54 check-valves
55 storage tanks
56 closure bodies
57 close spring
58 storage tank pipelines
60 choke blocks
65 low pressure memories
66 65 piston
70 second outflow valves
71 70 high voltage interface
72 70 low-voltage interface
75 check-valves
76 check-valves
77 check-valves
A valve interface
B valve interface
P valve interface
T valve interface
Claims (12)
1. hydraulic system, the hydraulic system is arranged for molding machine, particularly is used for die casting machine, and the hydraulic system
Including pressure medium source (30,31), storage tank (55), ejection cylinder (10) and outflow valve (50), the ejection cylinder has piston
(11), piston rod (12) and there is the first pressure room (14) worked on the removal direction of the piston rod (12), energy
Enough from the pressure medium source (30,31) Xiang Suoshu first pressure room discharge pressure medium, the outflow valve has high voltage interface
It (51) and can be towards the high voltage interface (51) open low-voltage interface (52) and the outflow valve utilizes the high-voltage connecting
Mouth (51) is connected to the second pressure room of the annular to work in the immigration direction of the piston rod (12) of the ejection cylinder (10)
(15) on and fluid path is guided from its low-voltage interface (52) to the storage tank (55), which is characterized in that
Flowed friction is arranged in from the outflow valve and guides into the fluid path of the storage tank, and in the flowed friction
Upstream, low pressure memory are connected on the fluid path, so that being at least temporarily less than towards the volume flow that the storage tank flows
Simultaneously by the volume flow of the outflow valve flow, and the difference between described two volume flows flows to the low pressure memory.
2. hydraulic system according to claim 1, wherein in the outflow low-voltage interface (52) of valve (50) and described low
Pressure memory (65) between outflow pipeline (53) in fluid path ratio be located at the flowed friction (54,60) downstream and
The fluid path being passed into the storage tank pipeline (58) in the storage tank (55) has bigger through flow cross section.
3. hydraulic system according to claim 1 or 2, wherein the low pressure memory (65) is tightened to low pressure in advance, and
And wherein the low pressure be in 2 bar between 8 bar, preferably in 4.5 bar between 5.5 bar.
4. hydraulic system according to claim 1,2 or 3, wherein the low pressure memory (65) is piston memory.
5. the hydraulic system according to preceding claims, wherein be connected to after the outflow valve (50) as flowed friction
It pre-tightens valve (54), and the low pressure memory (65) is connected to outflow valve (50) and the stream pre-tightened between valve (54)
In body connection.
6. the hydraulic system according to preceding claims, wherein the preload valve (54) is opened wide as towards the storage tank
Check-valves, the check-valves has closure body (56) and loads the closing spring of the closure body (56) along closing direction
(57).
7. hydraulic system according to claim 6, wherein the closing spring (57) of the check-valves (54) is by so pre-
Tightly, so that the opening pressure of the check-valves (54) is approximately equal to the preload pressure of the low pressure memory (65).
8. the hydraulic system according to preceding claims, wherein be connected to the stream as flowed friction after nozzle (60)
Valve (50) out, and the fluid that the low pressure memory (65) is connected between outflow valve (53) and the nozzle (60) connects
It connects.
9. according to claim 8 and hydraulic system according to any one of claims 5 to 7, wherein the nozzle (60)
It is parallel to preload valve (54) arrangement.
10. the hydraulic system according to preceding claims, wherein in order to improve the first pressure room of the ejection cylinder (10)
(14) pressure and presence multiplication cylinder (31) in, the multiplication cylinder is with primary piston (33) and relative to the primary piston
(33) the lesser secondary piston (34) on its acting surface, wherein forming annular space on the side of the primary piston (33)
(36), wherein there are such outflow valve (70), the outflow valve has high voltage interface (71) and can be towards the high-voltage connecting
Mouth (71) open low-voltage interface (72), and the outflow valve is connected to the multiplication cylinder using the high voltage interface (71)
(31) on annular space (36), and fluid path is guided from its low-voltage interface (72) to the storage tank (55), and wherein,
The low-voltage interface (72) of outflow valve (70) is connected on the low pressure memory (65).
11. hydraulic system according to claim 10, wherein the outflow valve (50) is the first outflow valve and the stream
Valve (70) is the second outflow valve out, and can flow out valve by described first will from the second pressure room (15) of the ejection cylinder (10)
Pressure medium is expressed in the storage tank (55), and can flow out annular of the valve from multiplication cylinder (31) by described second
Pressure medium is expressed in the storage tank (55) by space (36).
12. the hydraulic system according to preceding claims, wherein the outflow valve (50,70) is continuously to adjust
Valve.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102017221500.3A DE102017221500A1 (en) | 2017-11-30 | 2017-11-30 | Hydraulic system for a machine for molding, in particular for a die-casting machine |
| DE102017221500.3 | 2017-11-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109854551A true CN109854551A (en) | 2019-06-07 |
| CN109854551B CN109854551B (en) | 2022-12-30 |
Family
ID=66547706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811444943.8A Active CN109854551B (en) | 2017-11-30 | 2018-11-29 | Hydraulic system for a molding machine, in particular for a die-casting machine |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109854551B (en) |
| DE (1) | DE102017221500A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112524101A (en) * | 2020-11-20 | 2021-03-19 | 深圳领威科技有限公司 | Auxiliary energy storage device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102020201216B4 (en) | 2020-01-31 | 2022-09-29 | Robert Bosch Gesellschaft mit beschränkter Haftung | Hydraulic casting unit |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1949360A1 (en) * | 1968-09-30 | 1970-04-23 | Buehler Ag Geb | Die casting machine |
| CN1572392A (en) * | 2003-05-09 | 2005-02-02 | 东芝机械株式会社 | Injection system and casting method of die casting machine |
| DE102005035170A1 (en) * | 2004-10-15 | 2006-04-20 | Bosch Rexroth Ag | Hydraulically operated casting unit |
| CN201650893U (en) * | 2009-11-14 | 2010-11-24 | 翁学海 | High-speed hydraulic system |
| CN103174687A (en) * | 2013-03-25 | 2013-06-26 | 王文雯 | Pressurized and energy storing type energy-saving hydraulic pumping unit |
| CN104608574A (en) * | 2014-12-03 | 2015-05-13 | 中国北方车辆研究所 | Vehicle side-turn-prevention suspension device |
-
2017
- 2017-11-30 DE DE102017221500.3A patent/DE102017221500A1/en active Pending
-
2018
- 2018-11-29 CN CN201811444943.8A patent/CN109854551B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1949360A1 (en) * | 1968-09-30 | 1970-04-23 | Buehler Ag Geb | Die casting machine |
| CN1572392A (en) * | 2003-05-09 | 2005-02-02 | 东芝机械株式会社 | Injection system and casting method of die casting machine |
| DE102005035170A1 (en) * | 2004-10-15 | 2006-04-20 | Bosch Rexroth Ag | Hydraulically operated casting unit |
| CN201650893U (en) * | 2009-11-14 | 2010-11-24 | 翁学海 | High-speed hydraulic system |
| CN103174687A (en) * | 2013-03-25 | 2013-06-26 | 王文雯 | Pressurized and energy storing type energy-saving hydraulic pumping unit |
| CN104608574A (en) * | 2014-12-03 | 2015-05-13 | 中国北方车辆研究所 | Vehicle side-turn-prevention suspension device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112524101A (en) * | 2020-11-20 | 2021-03-19 | 深圳领威科技有限公司 | Auxiliary energy storage device |
| CN112524101B (en) * | 2020-11-20 | 2022-02-08 | 深圳领威科技有限公司 | Auxiliary energy storage device |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102017221500A1 (en) | 2019-06-06 |
| CN109854551B (en) | 2022-12-30 |
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