WO2016128381A1 - Druckübersetzervorrichtung, druckgiessmaschinen-giessaggregat und betriebsverfahren - Google Patents
Druckübersetzervorrichtung, druckgiessmaschinen-giessaggregat und betriebsverfahren Download PDFInfo
- Publication number
- WO2016128381A1 WO2016128381A1 PCT/EP2016/052690 EP2016052690W WO2016128381A1 WO 2016128381 A1 WO2016128381 A1 WO 2016128381A1 EP 2016052690 W EP2016052690 W EP 2016052690W WO 2016128381 A1 WO2016128381 A1 WO 2016128381A1
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- WIPO (PCT)
- Prior art keywords
- piston
- pressure
- casting
- pressure booster
- multiplier
- Prior art date
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Classifications
-
- 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
-
- 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
- F15B3/00—Intensifiers or fluid-pressure converters, e.g. pressure exchangers; Conveying pressure from one fluid system to another, without contact between the fluids
-
- 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
- B22D17/203—Injection pistons
-
- 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
- B22D17/2069—Exerting after-pressure on the moulding material
Definitions
- Pressure booster device pressure casting machine casting line and operating method
- the invention relates to a pressure booster device for pressure increase in a pressure fluid chamber of a piston / cylinder unit according to the preamble of claim 1 and to a casting unit equipped therewith for a die casting machine and to an associated operating method.
- a pressure booster device is used, for example, to increase the pressure in a pressure fluid space of a casting piston / casting cylinder unit with which a casting unit of a die casting machine is equipped.
- it can be used for any other purposes wherever an increase in pressure in a pressure fluid space of a piston / cylinder unit is required, so that a working piston or useful piston of the piston / cylinder unit has a desired working or useful function performs.
- the pressure booster device itself is manufactured as a piston / cylinder unit with a pressure booster cylinder and an axially movable in this pressure booster piston.
- the pressure booster device primarily serves to provide the increased holding pressure for a casting piston towards the end of a casting process.
- the intensifier is often called a multiplier.
- a check valve is incorporated in an inlet to the pressure fluid space of a casting-piston / casting-cylinder unit to be controlled to provide backflow of pressure medium from the pressure-increased pressure fluid space, e.g. back to a pressure fluid store to avoid.
- the check valve is integrated in the multiplier piston.
- the pressure booster cylinder has an outlet region, an inlet region upstream of the outlet region and a piston guide chamber.
- the pressure booster piston contains a piston part guided in the piston guide chamber and a piston part in from the piston part
- Direction of supply range extending piston rod which releases a fluid connection of inlet area and outlet area in a maximally moved back release position and blocked in a maximum advancing blocking position with a free end portion with which it extends into the exit area.
- Patent EP 2 365 888 B1 discloses such a pressure booster device with integrated non-return valve.
- a valve sleeve axially movable with a limited stroke is arranged in this known pressure booster device, which has a conical valve cone seat on its side facing the multiplier piston, which forms a check valve with a correspondingly conical valve cone-shaped free end face of the multiplier piston rod.
- the valve sleeve with its valve seat end face connects axially to the inlet region, which is formed as a cylinder portion with respect to a piston rod guide portion and an inlet-side portion of the outlet region and the valve sleeve of larger diameter.
- the piston rod is guided in the piston rod guide portion of the pressure booster cylinder between the piston guide chamber and the inlet area.
- Check valves are not unproblematic even when used in casting / casting cylinder units of die casting machines. They mean production costs, are prone to failure and susceptible to wear. For spring-actuated valves, spring damage can cause considerable secondary damage.
- the patent specification DE 10 2004 010 438 B3 discloses a hydropneumatic pressure intensifier intended for high-pressure applications with at least one hydraulic cylinder area containing a high pressure area and comprising a working piston and at least one pneumatic cylinder area comprising a pressure booster piston.
- this pressure booster the forward movement of the booster piston is started when the feed pressure exerted on the working piston causes a have reached dynamic pressure value at which, for example, a valve connected upstream of the pressure intensifier switches when a working piston carried by a working tool comes to rest on a tool to be machined.
- a similar differential pressure control of a pressure booster piston is provided for a pressure-intensified power cylinder unit in the published patent application DE 31 45 401 A1.
- fluid pressure is fed back via a suction nozzle or a controlled slide to a pressure booster chamber, so that acts on the pressure booster piston, a differential pressure, which moves it forward when the differential pressure exceeds a corresponding minimum value.
- the Auslegeschrift DE 20 17 951 discloses a die casting machine with multiplier, in which the feed motion of the multiplier piston is then started in a similar manner when towards the end of a pressing or G mankolbenhubs at the end of Formyogllphase a respective casting the pressure in the working space of the pressing / casting cylinder because of the now filled form increases.
- An adjustable to a certain pressure hydraulic pilot element then actuates a Zuschaltventil to introduce pressurized fluid in a multiplier piston chamber.
- the invention is based on the technical problem of providing a pressure booster device of the type mentioned in the introduction, which can be manufactured with relatively little effort and has high functional reliability and low tendency to wear. Further objects of the invention are to provide a casting unit equipped with such a pressure booster device for a die-casting machine and an operating method therefor.
- the outlet region of the pressure booster cylinder has a passage cross-section which is at least as large as a rod cross-section of the free piston rod end section in a section which is passed from the free piston rod end section when moving from its release position to its blocking position. This has the consequence that the pressure booster piston with its piston rod can extend unhindered into the outlet region when it is advanced to provide the desired pressure increase.
- the multiplier piston can advance with its piston rod through the outlet region of the multiplier cylinder and beyond it into the pressure fluid space of the coupled piston / cylinder unit, in order to provide the desired pressure increase by corresponding volume displacement.
- a check valve can be omitted in this pressure booster device, and by eliminating corresponding movable valve components, the manufacturing cost is reduced. Failures and malfunctions that can occur through such a check valve in conventional pressure booster devices, as well as omitted, such as spring breaks of spring-actuated mechanical components.
- a significant return flow of pressure fluid from the pressure fluid chamber of a coupled piston / cylinder unit or from the outlet region of the pressure booster cylinder back into the inlet region is prevented by the multiplier piston blocking the otherwise released fluid connection of the inlet region and outlet region with its piston rod in the blocking position ,
- the blocking of this fluid connection can be realized as a complete shut-off or merely as a predominant shut-off of the maximum passage cross-section of this fluid connection.
- the flow cross-section is significantly less than the maximum flow cross-section with foundedbewegter in the release position piston rod, eg less than 10% and preferably less than 1% of this maximum flow cross-section, in particularly advantageous embodiments in the field from about 0.01% to about 0.1% of the maximum flow area.
- a residual fluid connection may be formed, for example, by one or more corresponding gap regions between the outer periphery of the piston rod and an inner periphery of an opposite cylindrical portion of the exit region. In appropriate applications, it does not lead to a noticeable impairment of the pressure increase function of Pressure translator device, for example, when used in a casting unit of a die casting machine, taking into account the rapid timing of a typical pressure increase phase toward the end of a casting process.
- a pressure booster inlet valve controlled independently of a pressure in the pressure fluid chamber of the piston / cylinder unit is arranged, and the outlet region is check valve-free executed.
- the latter is meant that at a defined volume of this area, including the subsequent pressure fluid space of the piston / cylinder unit no check valve is coupled.
- the feed movement of the pressure booster piston can be controlled in a respectively desired manner, without being influenced by any pressure fluctuations and delay times of the pressure fluid used in the piston / cylinder unit and the pressure exerted by it. It is also possible with this measure, in contrast to the above-described, conventional differential pressure controls to start the forward movement of the pressure booster piston already comparatively early and in particular even before a building up differential pressure has exceeded a predetermined threshold.
- check valve means in addition to the above-mentioned advantages also the elimination of a time-delayed behavior related to the pressure rise time for the pressure increase provided by the pressure booster device pressure increase, which can improve the casting process when used in die casting machines.
- the outlet region of the pressure booster cylinder is designed as a section which is radially narrowed relative to the inlet region.
- the pressure booster piston can block the fluid connection between the inlet area and the outlet area by moving from the inlet area with the larger cross section into the outlet area with the narrowed, narrowed area. moved forward cross section.
- the cross section of the free piston rod end section extending into the exit region is approximately as large or only slightly smaller, for example less than 10%, and preferably less than 1% smaller, than the section of the exit region receiving it, in particular eg less than about 0.01% to about 0.1% thereof.
- a diameter of the respective section of the exit region is greater than a diameter of the free piston rod end section, so that an intermediate annular gap is formed when the piston rod end section advances into the exit region.
- this annular gap can remain open or be sealed by means of a suitable ring seal.
- the peripheral edge of the free piston rod end portion receiving outlet region-cylinder portion on the inlet side on an insertion cone can facilitate the introduction of the piston rod advancing from the inlet area into the outlet area.
- the piston rod can be correspondingly conically shaped on its free end face.
- the pressure booster cylinder is manufactured as a one-piece component. This contributes to minimizing the manufacturing cost.
- the one-piece pressure booster cylinder component can be coupled directly to the pressure fluid space of the piston / cylinder unit, in which the pressure increase is needed, such as to a pressure fluid working space of a casting piston / casting cylinder unit of a die casting machine.
- the pressure booster cylinder has a piston rod guide section between the piston guide chamber and the inlet region. This can support the guidance of the multiplier piston during its axial movement. It may be advantageous in terms of manufacturing technology to design the piston rod guide section with the same diameter as that of the section of the outlet area receiving the advancing piston rod.
- the outlet region and the inlet region of the pressure booster cylinder have sections of the same cross-section, wherein the inlet region also includes a radial inlet bore, which radially into the latter from the outside Inlet area section of the pressure booster cylinder opens.
- the inlet region includes at least one radial bore and an associated with this, the front side Ausmündende axial bore in the free piston rod end portion.
- the pressurized fluid is thus supplied in this embodiment through the free end portion of the multiplier piston rod through the pressure fluid space of the piston / cylinder unit to be controlled.
- the fluid connection of inlet area and outlet area can be blocked by blocking the radial piston rod bore through the outlet area. If necessary, the multiplier piston can extend into the exit region with its piston rod even in the maximum retracted release position, which can further improve the guidance of the multiplier piston in the multiplier cylinder.
- the inlet region includes at least one axial L Lucassnutkanal on a peripheral side of the free end portion of the multiplier piston rod.
- the pressure fluid to be supplied to the piston / cylinder unit to be controlled flows along the one or more axial piston rod L Lucassnutkanäle in the pressure fluid working space of the piston / cylinder unit to be controlled.
- the blocking of the fluid connection of inlet area and outlet area can be effected in this embodiment variant by blocking off the axial longitudinal slot channels or channels from the remaining entry-side inlet area through the outlet area.
- the multiplier piston can still extend into the outlet region with its piston rod in the maximally moved-back release position.
- the pressure booster device includes a useful piston position sensor for detecting the position of a piston of the piston / cylinder unit and / or a multiplier piston position sensor for detecting the position of the pressure booster piston and a controller that the pressure intensifier inlet valve depending on a useful piston position signal of the useful piston position sensor and / or dependent on a multiplier piston position signal of the multiplier piston position sensor controls and / or the pressure booster back pressure valve depending on a useful piston position signal of Nutzkolben-position sensor and / or of a Multiplikatorkolben position signal of the Multiplikatorkolben- Position sensor controls.
- this measure according to the invention makes it possible, if desired, to advance the multiplier piston in its course over its entire stroke from the maximum retracted position to the maximum advanced position or only along a partial section of this total stroke, regardless of the pressure conditions in the various pressure volumes freely defined control or control technology, for example in the form of a predetermined profile of the time course of the movement path or the movement speed of the multiplier piston or a predetermined profile of the time profile of the pressure in the pressure fluid space of the piston / cylinder unit.
- An inventive casting unit for a die casting machine which is equipped with the pressure booster device according to the invention, enables an increased economy of the die casting machine and an increased quality of the thus cast iron casting machine. products.
- the invention also includes a die casting machine having such a casting unit.
- the printing machine casting unit according to the invention can be operated in particular by the method according to the invention, in which case the feed movement of the pressure booster piston of the pressure booster device is characteristically started before the end of the mold filling phase.
- This allows in comparison to conventional operating methods in which the pressure booster piston is started only after the end of Formdrallphase due to the concomitant pressure increase in the casting cylinder, a shortening of the time required for the casting process and also creates the prerequisite for an otherwise optimized flow of the casting process ,
- the advancing movement of the pressure booster piston is controlled or regulated as a function of the useful piston position signal of the useful piston position sensor and / or as a function of the multiplier piston position signal of the multiplier piston position sensor, if the pressure booster device has such a useful piston position sensor or Multiplier piston position sensor features.
- the advancing movement of the pressure booster piston can advantageously be coupled to the advancing movement of the casting piston, without being dependent on the pressure ratios of a working fluid and / or the melt material to be cast in the casting cylinder.
- the advancing movement of the pressure booster piston in its course over its entire stroke from the maximum backward to the maximum advanced position or only along a portion of this total stroke according to a predetermined nominal profile of the time course of the movement path or the speed of movement Controlled or regulated multiplier piston regardless of the pressure conditions in the various participating pressure chambers or in accordance with a predetermined desired profile of the time course of the pressure in the pressure fluid space of the piston / cylinder unit.
- FIG. 1 is a schematic side view of a multiplier device with coupled casting piston / casting cylinder unit of a casting unit of a die casting machine in a starting position
- FIG. 2 is a side view of an exemplary structural realization of the arrangement of Fig. 1,
- Fig. 3 is the view of Fig. 1 in a first casting phase of a casting of the
- FIG. 4 shows the view of FIG. 1 in a second casting phase before the multiplier start
- FIG. 5 shows the view of FIG. 1 during the second casting phase after multiplier start
- FIG. 6 shows the view of FIG. 1 at pressure increase start at the beginning of a third casting phase
- FIG. 7 shows the view of FIG. 1 during a post-compression in the third casting phase
- FIG. 8 shows the view of FIG. 1 at the conclusion of the third casting phase
- FIG. 9 shows the view of FIG. 2 for a variant with annular gap sealing
- Fig. 10 shows the view of Fig. 2 for a variant with cross-section equal inlet
- Exit area, 1 the view of FIG. 2 for a variant with axial inlet bore in the free end portion of the multiplier piston rod,
- Fig. 12 is the view of Fig. 2 for a variant with axial inlet L jossnutkanälen in the free end portion of the multiplier piston rod and Fig. 13 is the view of Fig. 1 for a variant with respect to the driven
- Piston / cylinder unit angled arranged multiplier device Piston / cylinder unit angled arranged multiplier device.
- FIG. 1 The arrangement shown schematically in FIG. 1 comprises a pressure booster device 1, also referred to as a multiplier device or multiplier for short, which is coupled to a piston / cylinder unit, here in the form of a casting piston / casting cylinder unit 2 of a pressure casting machine.
- Fig. 2 shows a possible advantageous structural design of this arrangement. As far as not shown here, have a casting piston / casting cylinder unit 2 comprehensive casting unit and equipped therewith die casting machine on a conventional structure.
- the casting piston / casting-cylinder unit 2 controlled by the multiplier includes a casting cylinder 3 and as a working or useful piston a casting piston 4 which is guided with a head part 4a in the casting cylinder 3.
- the head part 4a is supported in a fluid-tight manner on an inner wall of the casting cylinder 3 via a moving sealing and guiding system 5a and divides it into a casting piston head space 6, which acts as the pressure fluid space of the piston / cylinder unit 2, and a casting piston annulus 7.
- the casting piston 4 extends with a piston rod part at the end, which is opposite to the head part 4a, from the casting cylinder 3 with sealing by a arranged at an associated end-side passage bore of the casting cylinder 3 sealing and guiding system 5b addition.
- a drain line 8 with associated drain valve 9 leads from the casting piston annulus 7.
- the casting piston head space 6 is designed without a check valve, i. there is no check valve connected to this volume.
- the multiplier 1 is likewise embodied as a piston / cylinder unit and comprises a pressure booster cylinder 10 and a pressure booster piston 1 1 guided axially movably in the latter.
- the multiplier cylinder 10 comprises an exit region 12, an inlet region 13 upstream of the outlet region 12 and a piston guide chamber 14. In addition, it has a piston rod guide section 15 between the piston guide chamber 14 and the inlet region 13.
- the multiplier piston 1 1 has at one end a guided in the piston guide chamber 14 piston part 1 1 a and from this from the piston guide chamber 14 out in the direction of inlet region 13 extending piston rod 1 1 b.
- the exit region 12, like the casting piston head space 6, is designed without a check valve.
- the inlet region 13 is designed without check valves.
- the multiplier piston 11 In the maximum retracted initial position shown in FIGS. 1 and 2, the multiplier piston 11 extends with its piston rod 11b into the piston rod guide section 15 and ends there before the inlet region 13. In alternative embodiments, it can also be located in the inlet region 13 end. With its piston part 11a and the associated sealing and guiding system 16, the multiplier piston 11 divides the piston guiding space 14 of the multiplier cylinder 10 into a multiplier piston chamber 14a and a multiplier back pressure chamber 14b, which forms a multiplier annular space 14b here. From the multiplier annulus 14b performs a return pressure line 18, also called drain line, with associated multiplier back pressure valve 19, also called multiplier drain valve, from.
- a return pressure line 18, also called drain line with associated multiplier back pressure valve 19, also called multiplier drain valve
- multiplier piston chamber 14a opens a multiplier supply line 20 with associated multiplier inlet valve 21st
- inlet and outlet in the present case are chosen only for distinction and do not mean that a pressurized fluid is only supplied or removed via the components in question could. Rather, depending on the application pressure fluid can also be supplied via the drain line and / or discharged via the supply line, for example, to provide a back pressure in the back pressure chamber 14b for moving back the multiplier piston 1 1. The back pressure does not have to be overpressure, it is sufficient that there is a corresponding differential pressure between the back pressure chamber 14b and the multiplier piston chamber. In the exemplary embodiment of FIG.
- the outlet region 12 is designed as a section of the multiplier cylinder 10 which is radially narrowed relative to the inlet region 13. This is realized in that both areas are formed by associated axial, cylindrical portions of the multiplier cylinder 10 of different diameters to form a corresponding annular shoulder 24 at the transition of inlet region 13 and outlet region 12.
- the smaller diameter or cross section of the outlet region 12 compared to that of the inlet region 13 can be equal to the diameter or cross section of the piston rod guide section 15, which is arranged as a further cylindrical section of the multiplier cylinder 10 on the side of the inlet region 13 opposite the outlet region 12.
- the diameter or cross section of the inlet 13 and the piston rod guide portion 15 radially extended inlet region 13 may be equal to the diameter or cross section of the piston guide chamber 14, which adjoins the piston rod guide portion 15 on the inlet side 13 opposite side. This pairwise diameter equality can have manufacturing advantages.
- Fig. 2 shows a structurally advantageous embodiment, in which the pressure booster cylinder 10 is made as a one-piece component, which connects with its outlet region 12 directly to the casting piston head space 6 of the casting / casting cylinder unit 2.
- This one-piece construction for the multiplier cylinder 10, which can be mounted with the recorded in him multiplier piston 1 1 directly to the casting cylinder 3 of the casting has manufacturing and functional advantages.
- the various inlet and outlet lines 8, 19, 20, 22 and associated valves 9, 19, 21, 23 omitted, leading to corresponding sources of pressure fluid or Druckfluidsenken, as known in the art itself.
- the term pressurized fluid in the present case means any liquid or gaseous pressure medium which is suitable for the person skilled in the art for use in each particular case of use.
- the pressure booster device 1 has the multiplier piston 11 as the only movable component.
- Other moving components such as a check valve or other movable components to form a backflow preventer, are not necessary. This minimizes the mechanical loads and the susceptibility to wear of the multiplier 1. If the multiplier 1 and 2 moved forward from its starting position shown in FIGS. 1 and 2, to the right in FIGS. 1 and 2, it first enters into the inlet region 13 with its piston rod 11 b and then through the latter into the outlet region 12 into it. As soon as it reaches the exit region 12, it constricts the fluid connection from the inlet region 13 to the outlet region 12, whereby a significant reflux of pressurized fluid from the casting piston head space 6 into the inlet region 13 is prevented.
- multiplier piston rod 1 1 b For safe, centered entry of the multiplier piston rod 1 1 b in the exit region 12 may be provided an insertion aid.
- this is realized in that the peripheral edge of the exit region 12 formed by the annular shoulder 24 at the transition between inlet region 13 and outlet region 12 has a frusto-conical introduction cone 25.
- the multiplier piston rod 1 1 b is optionally provided at its free end side with a corresponding frusto-conical insertion cone 26.
- the multiplier piston 1 1 moves axially forward to provide the required pressure increase in the casting piston head space 6 until it reaches the exit region 12 with the free end section of its piston rod 11 b, wherein it reaches a maximum of depending on design and requirements proposewegten blocking position extends into the outlet region 12 into or beyond this out into the casting piston headspace 6 inside.
- the outlet region 12 has a sufficiently large passage cross section for the free piston rod end portion over a portion, which can be passed from the free end portion of the piston rod 1 1 b during movement of the multiplier piston 1 1.
- this passage cross section is at least as large as a rod cross section of the free end portion of the multiplier piston rod 1 1 b.
- a controller 32 serves to control components of the multiplier device 1 to be controlled in a desired manner. For this purpose, it provides, inter alia, control signals 32a, 32b, 32c, 32d for the aforementioned controllable valves 9, 19, 21 and 23. In particular, in this case, the controller 32 is designed so that it controls the multiplier inlet valve 21 and / or the multiplier discharge valve 19 regardless of the pressure conditions in the casting piston / casting cylinder unit 2.
- the pressure booster device additionally comprises a useful piston position sensor 33 for detecting the position of the casting piston 4 and / or a multiplier piston position sensor 34 for detecting the position of the pressure booster piston 11.
- position sensors 33, 34 can be used any known to those skilled per se sensor types.
- both or only one of the position sensors are provided, and in corresponding embodiments, both valves 19 and 21 or only one of them are driven in this manner.
- FIGS. 3 to 8 a casting operation executable with the arrangement of FIGS. 1 and 2 will be explained below as an exemplary example of the casting unit operating method according to the invention, from which the properties and advantages of this method and of the pressure translator device according to the invention will become more apparent .
- the associated control measures can be performed by the control unit 32. This may be part of an overall control of the die casting machine concerned or designed as a separate unit specifically for the casting unit.
- the casting piston 4 and the multiplier piston 1 1 Prior to a casting process, are each in the starting position shown in FIGS. 1 and 2, which can be defined for example by a respective rear mechanical stop or by an electronic control measure.
- the casting process then starts with the fact that, at the beginning of a first casting phase, pressurized fluid or hydraulic medium is introduced from the associated pressurized fluid source via the casting piston feed line 22 and the opened inlet valve 23 into the inlet region 13 and from there into the exit region 12 of the multiplier.
- gate 1 flows from where it enters the casting piston headspace 6, as illustrated with a flow arrow S1.
- pressure fluid flows out of the casting piston annulus 7 via the associated drain line 8 when the drain valve 9 is open, as illustrated by a flow arrow S2.
- the casting piston 4 moves forward in motion, to the right in FIG. 3, as illustrated by a movement arrow B1.
- the casting piston 4 typically moves at a relatively slow rate, as is adequate for this so-called prefill phase.
- the movement of the multiplier piston 1 1 is thereby controlled or synchronized via the corresponding activation of the associated valves 19 and 21 so that the fluid connection from the inlet region 13 to the outlet region 12 remains freely released, ie in this first casting phase, no inflow restriction of the fluid connection is effective.
- the multiplier piston 1 1 remain in its maximum backward release position or already slightly advanced or accelerated at low speed, but only to a degree that does not lead to an inflow throttling yet.
- Fig. 4 shows the arrangement at the beginning of a subsequent second casting phase, also referred to as Formglallphase.
- the casting piston 4 is typically accelerated to a significantly higher filling speed compared with its velocity during the first casting phase.
- liquid molten metal is injected at high speed into a casting mold of the die casting machine.
- the pressure fluid flows are similar to those of the first casting phase, but with partially different pressure fluid flow rates or valve positions, as known to those skilled in the art.
- the higher casting piston speed compared to the first casting phase is symbolized by an extended movement arrow B2.
- Fig. 5 illustrates the arrangement at a time when the multiplier piston 1 1 has begun its forward movement.
- the multiplier piston chamber 14a is supplied with pressurized fluid or hydraulic medium via the associated supply line 20 when the inlet valve 21 is open, as illustrated by a flow arrow S3.
- the starting time of the multiplier feed movement is control technology using the relevant inlet and / or drain valve technique of the multiplier 1, in particular under appropriate Depending on the needs and application in the time interval of Formyogllphase, ie the second casting phase, as shown in Fig. 5, alternatively also only at the end of Formglallphase or already in the period the prefill phase.
- pressurized fluid is discharged from the multiplier annulus 14 via the associated drain line 18 when the drain valve 19 is open, as illustrated by a flow arrow S4.
- the temporal coordination of the movement of the multiplier piston 1 1 and the casting piston 4 must be precisely tuned with melt, taking into account the other requirements and circumstances of the respective casting process and in particular the beginning and end of the mold filling, so that the constriction or constriction of the fluid connection of inlet region 13 and Exit area 12 neither too early, nor too late. In this way, a favorable transition from the mold filling phase to a subsequent post-compression phase can be achieved, in which the casting piston 4 is strongly braked by melt compression, as is known.
- FIG. 6 illustrates the arrangement at the beginning of a third casting phase subsequent to the second casting phase, the so-called post-pressure phase or post-compression phase.
- the multiplier piston 1 1 has advanced into the outlet region 12 with the free end section of its piston rod 11 b, thereby blocking or blocking the fluid connection between inlet region 13 and outlet region 12.
- the compression of the pressure fluid in the casting piston head space 6 can begin instantaneously or without delay by the multiplier piston 1 1 with its piston rod 1 1 b by its forward movement volume in the exit region 12 and, if he moves so far forward , also displaced in the casting piston headspace 6.
- annular gap 27 may remain between the outer circumference of the multiplier piston rod 11 b and an opposite edge of the exit region 12.
- the annular gap 27 is kept very narrow, so that the fluid connection between inlet region 13 and casting piston head space 6 is almost completely separated.
- an extremely low leakage pressure fluid flow which is not relevant for the pressure casting system in terms of process engineering and control technology, remains depending on the pressure conditions.
- the annular gap has a free annular cross section, which is expediently much smaller than 10% and preferably less than 1%, preferably less than 0.01% to 0.1%, of the cross section of the outlet region 12 with the multiplier piston 1 1 retracted.
- Fig. 7 illustrates the arrangement in a subsequent course of the third casting phase.
- the multiplier piston 1 1 is moved further forward and emerges through the outlet region 12 into the casting piston head space 6.
- the hydraulic pressure in the casting piston head space 6 is increased to a procedurally desired level. Since hereby the melt in the casting mold is also densified, the casting piston 4 still passes through a small residual path in an initial part of the third casting phase, being illustrated in FIG. 7 by a movement arrow B4.
- Fig. 8 illustrates the arrangement at the end of the third casting phase.
- the casting piston 4 has come to a standstill because the melt has been completely compressed with the desired pouring pressure.
- the melt is already partially solidified at this time in relevant areas of the casting run or the mold, and there is no further forward movement of the casting piston 4 more.
- the cast product further cools due to heat extraction in the mold.
- the hydraulic pressure in the casting piston head space 6 is kept constant by means of pressure control.
- the multiplier piston 1 1 is advanced only at extremely low speed, illustrated in Fig. 8 by a shortened movement arrow B5, where he displaces just as much pressurized fluid in the casting piston headspace 6, as by the Annular gap 27 flows back between multiplier piston rod 1 1 b and surrounding outlet region-cylinder edge in the direction of inlet region 13.
- a pressure fluid leakage through this annular gap 27 through the counteracting forward movement of the multiplier piston 1 1 for the purpose of pressure maintenance is compensated in a simple manner.
- the corresponding pressure on the multiplier system and / or on the casting cylinder system can be suitably regulated by the control of the associated valves by means of the controller 32 in a manner known per se.
- the multiplier according to the invention makes it possible to reduce the pressure rise time for the holding pressure phase in comparison to conventional multiplier devices with a check valve.
- the multiplier constricts the flow of pressurized fluid to the casting piston head space, after which the pressure build-up in the casting piston head space follows virtually without delay.
- the multiplier according to the invention can be built robust and compact and realized with the multiplier piston as the only movable component.
- the multiplier piston in particular when using the operating method according to the invention, can already be set in motion sufficiently early to already have a relatively high speed at the end of the mold filling phase or at the beginning of the holding pressure phase, and thus to be able to realize a correspondingly rapid increase in pressure. While in conventional multiplier systems with spring-loaded check valve an unavoidable dead time caused by the closing time, which is caused by the accelerated by spring force valve body, this dead time is omitted here due to the omission of such a check valve. In the present case, therefore, the pressure rise time consists only of the periodic proportion of time remaining due to the finite volume displacement rate for the compression of the pressure fluid in the casting piston head space.
- the pressure intensifier inlet valve is controlled depending on the useful piston position signal of the useful piston position sensor and / or depending on the multiplier piston position signal of the multiplier piston position sensor, and / or the pressure booster back pressure valve is dependent on the useful piston position signal of the useful piston position sensor and / or the multiplier piston Controlled position signal of the multiplier piston position sensor.
- the term of controlling should, unless otherwise stated, encompass both the possibility of pure control and the possibility of regulation.
- the feed movement of the pressure booster piston is thus independent of the pressure conditions in the various pressure chambers involved.
- control unit by appropriate control of the pressure booster inlet valve and / or the pressure booster back pressure valve, the feed movement of the pressure booster piston in its time course along its entire stroke from the maximum backward to the maximum forward position or only along a subsection this total stroke according to a predetermined nominal profile of the time profile of the pressure in the pressure fluid space of the piston / cylinder unit, ie in the casting piston headspace, controls or regulates.
- the control unit uses pressure sensor signals of a conventional and therefore not shown in detail pressure sensor, which is associated with the casting / casting cylinder unit of the die casting machine in the usual way.
- Such a profile-based control of the advancing movement of the multiplier piston can be based, for example, on a precalculation, which in particular includes a precalculation of the desired time at which the multiplier stubs off the pressure fluid flow to the plunger headspace.
- the subsequent multiplier-driven increase in pressure is determined by the area-weighted differential speed of the multiplier piston and the working piston of the piston / cylinder unit, ie in the case of the die casting application of the casting piston or casting cylinder piston.
- the speed of the multiplier piston can be adjusted to the speed of the casting / working piston so that the pressure increase assumes a certain value or follows a desired time course.
- the pressure rise can also be temporarily reduced to zero, ie it is pressure constant before, or temporarily set to a negative value, which then corresponds to a reduction in pressure.
- the multiplier according to the invention requires only a few components and is comparatively easy to install.
- the risk of spring breakage, as it exists in spring-loaded check valves, is completely eliminated. While in conventional systems with spring-loaded check valve selbiges swing depending on the design and flow or even begin to beat, this case for the casting process and the service life of the casting harmful property due to the dropping check valve and the corresponding missing the spring-mass system ,
- a further advantage of the invention when the check valve is omitted is that flow pressure losses are reduced from the pressure fluid source via the inlet valve to the casting piston, in particular during the second casting phase. This allows a smaller design of the casting system and / or a casting with higher casting power.
- the advantages and characteristics of the invention apply equally to systems in which the casting piston speed is controlled, as well as to systems with pure control of the casting piston speed.
- the multiplier according to the invention can be used independently of the type of G confusezylinderan Kunststoffung in a casting unit.
- the usability is also possible regardless of whether and 0 in what way so-called differential controls are present on the casting unit, which feedback the outflowing pressure fluid flow in support of inflowing pressure fluid.
- the multiplier movement provides an additional pressure fluid flow for the casting cylinder through volume displacement.
- the compressibility of the melt is generally extremely low, so that the pressure increase acts essentially via the volume displacement of the advancing multiplier piston.
- FIGS. 9 to 12 exemplarily illustrate some further embodiments of the pressure booster device according to the invention as variants of the design shown in FIG.
- the embodiment of FIG. 9 differs from that of FIG. 2 in that for sealing the annular gap area between the inner edge of the exit region 12 and the advanced multiplier piston rod 11 b, an additional Sealing and / or guide system 28 is provided, preferably as a separate component which is attached to the inner edge of the outlet region 12.
- the additional sealing and / or guiding system 28 provides for a corresponding additional sealing of the annular gap 27 or additional guidance of the multiplier piston rod 11 b in the outlet region 12.
- the sealing and / or guiding system 28 can also have a gap-changing function For example, by design such that it pressure-dependent, for example, depending on the pressure in the casting piston head space 6, the sealing effect is affected, for example, reduces the gap to reduce the leakage-return flow.
- the sealing / guiding system 17 in the region of the piston rod guide portion 15 of the multiplier cylinder 10 can also be realized and arranged in this way.
- the inlet region comprises an axial section 13a and a radial inlet bore 13b which opens out from the outside and extends through a housing wall of the pressure booster cylinder 10.
- the axial inlet section 13a is formed with the same diameter as the outlet region 12 and the piston rod guide section 15 through a common axial central bore in the pressure booster cylinder 10.
- the piston rod guide portion 13, the axial inlet portion 13a and the outlet portion 12 merge into one another without sharp separation.
- a plurality of radial inlet bores can be distributed on the circumference of the multiplier cylinder 10.
- additional sealing and / or guiding systems can be arranged axially in front of and / or behind the orifice parts of the one or more inlet bores 13b in a manner not shown.
- the blocking of the fluid connection of inflow region 13a, 13b and outlet region 12 takes place in that the advancing multiplier piston 1 1 with its piston rod 11 b shuts off the junction of the radial inflow bore 13b into the axial inflow section 13a.
- the multiplier piston rod 1 1 b at its free end portion an end-side opening, axial central bore 29 and one or more radial inlet bores 30, which at a predetermined distance to the front end of the multiplier piston rod 1 first b extend from the outer periphery of the central bore 29.
- the multiplier Piston 1 1 with its piston rod 1 1 b as shown in the maximum backward release position with its free piston rod end portion extend into the exit region 12 into it.
- the pressurized fluid passes from the inlet region 13 via the one or more radial bores 30 to the central bore 29 of the multiplier piston rod 11 b and from there into the casting piston head space 6, as illustrated by a flow arrow S5.
- the multiplier piston 11 is advanced until the radial inlet bores 30 have completely passed out of the inlet region 13 into the outlet region 12.
- the outlet region 12 then blocks with its inner edge the mouth of the one or more radial inlet bores 30 and thus blocks the pressure fluid path between the inlet region 13 and the outlet region 12.
- the mechanical Ein slaughter Anlagen omitted for the occurrence of the multiplier piston rod 1 1 b in the outlet region 12.
- the multiplier piston rod 1 1 b is located along the entire path of movement of the multiplier piston 1 1 between its maximum retracted release position and its maximum advanced blocking position in the exit region 12 and can be guided by this.
- the multiplier piston rod 11b has, at its free end portion, one or more longitudinal groove channels 31 which, on the outside of the free end section of the multiplier piston rod 11b, extend from their front end to a first end groove predetermined channel length are introduced.
- the piston rod 11b of the multiplier piston 11 can always extend into the outlet region 12 in the exemplary embodiment of FIG. 12, even in the maximum retracted release position of the multiplier piston shown in FIG 1 1.
- the pressurized fluid can flow from the inlet region 13 via the longitudinal groove or channels 31 through the outlet region 12 into the casting piston head space 6, as illustrated by a flow arrow S6.
- an insertion aid for the entry of the advancing multiplier piston rod 11b into the exit region 12 can be dispensed with.
- the blocking of the fluid connection of inlet area 13 and outlet area 12 is effected in this example by advancing the multiplier piston rod 11b until the longitudinal groove channels 31 completely out of the inlet area 13 into the outlet area 12 have gotten into it.
- the multiplier piston rod 1 1 b then in turn blocks the pressure fluid path between inlet region 13 and outlet region 12, if appropriate leaving the slight, above-mentioned annular gap.
- the multiplier 1 is arranged as an extension of the piston / cylinder unit 2 which it controls, ie. with aligned longitudinal axes of both piston / cylinder units 1, 2.
- any other geometric arrangement of the multiplier 1 relative to the piston / cylinder unit 2 driven therefrom is possible, in particular angled arrangements in which the longitudinal axis of the multiplier piston 1 1 a includes any predetermined angle to the longitudinal axis of the casting piston 4.
- 13 shows an exemplary embodiment in which a multiplier 1 'is arranged at an angle of 90 ° relative to a piston / cylinder unit 2' controlled by it, wherein, moreover, the multiplier 1 'corresponds to that of FIG.
- the multiplier is arranged with the longitudinal axis of the multiplier piston displaced parallel to the longitudinal axis of the casting piston or in opposite directions. In the latter case, the longitudinal axis of the multiplier piston is parallel to the longitudinal axis of the casting piston, but the multiplier piston moves in the opposite direction to the movement of the casting piston.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
- Supercharger (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16706148.0A EP3256277B1 (de) | 2015-02-09 | 2016-02-09 | Druckübersetzervorrichtung, druckgiessmaschinen-giessaggregat und betriebsverfahren |
CN201680020785.6A CN107427909B (zh) | 2015-02-09 | 2016-02-09 | 增压器装置、压铸机铸造单元和操作方法 |
JP2017541806A JP6787905B2 (ja) | 2015-02-09 | 2016-02-09 | 増圧装置、圧力鋳造機械の鋳造ユニット及び駆動方法 |
US15/549,464 US11015619B2 (en) | 2015-02-09 | 2016-02-09 | Pressure intensifier device, diecasting machine casting unit and operating method |
ES16706148T ES2774500T3 (es) | 2015-02-09 | 2016-02-09 | Dispositivo intensificador de presión, grupo de fundición de máquinas de fundición a presión y método de funcionamiento |
MX2017010194A MX2017010194A (es) | 2015-02-09 | 2016-02-09 | Dispositivo intensificador de presion, unidad de colada de maquinas de fundicion a presion y metodo de operacion. |
HK18106980.9A HK1247590A1 (zh) | 2015-02-09 | 2018-05-29 | 增壓器裝置、壓鑄機鑄造單元和操作方法 |
US17/128,698 US11649836B2 (en) | 2015-02-09 | 2020-12-21 | Pressure intensifier device, diecasting machine casting unit and operating method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102015202273.0 | 2015-02-09 | ||
DE102015202273.0A DE102015202273A1 (de) | 2015-02-09 | 2015-02-09 | Druckübersetzervorrichtung und Druckgießmaschinen-Gießaggregat |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/549,464 A-371-Of-International US11015619B2 (en) | 2015-02-09 | 2016-02-09 | Pressure intensifier device, diecasting machine casting unit and operating method |
US17/128,698 Division US11649836B2 (en) | 2015-02-09 | 2020-12-21 | Pressure intensifier device, diecasting machine casting unit and operating method |
Publications (1)
Publication Number | Publication Date |
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WO2016128381A1 true WO2016128381A1 (de) | 2016-08-18 |
Family
ID=55411357
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/EP2016/052690 WO2016128381A1 (de) | 2015-02-09 | 2016-02-09 | Druckübersetzervorrichtung, druckgiessmaschinen-giessaggregat und betriebsverfahren |
Country Status (9)
Country | Link |
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US (2) | US11015619B2 (de) |
EP (1) | EP3256277B1 (de) |
JP (1) | JP6787905B2 (de) |
CN (1) | CN107427909B (de) |
DE (1) | DE102015202273A1 (de) |
ES (1) | ES2774500T3 (de) |
HK (1) | HK1247590A1 (de) |
MX (1) | MX2017010194A (de) |
WO (1) | WO2016128381A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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EP3421155B1 (de) * | 2017-06-28 | 2019-06-19 | Parker Hannifin Manufacturing Germany GmbH & Co. KG | Hydraulische schaltungsanordnung für eine kaltkammerdruckgussmaschine |
JP7301192B2 (ja) * | 2018-04-13 | 2023-06-30 | 芝浦機械株式会社 | 射出装置及び成形機 |
JP7057707B2 (ja) * | 2018-04-13 | 2022-04-20 | 芝浦機械株式会社 | 射出装置及び成形機 |
CN112276034A (zh) * | 2020-09-11 | 2021-01-29 | 周芮冬 | 一种压铸机二次增压可调节装置 |
CN112303044B (zh) * | 2020-11-03 | 2024-07-16 | 江苏维达机械有限公司 | 增压油缸 |
CN114425612A (zh) * | 2021-12-20 | 2022-05-03 | 大连理工大学 | 一种可延长增压有效时间的冲头装置以及压铸方法 |
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DE3145401A1 (de) * | 1981-11-16 | 1983-05-26 | Unima Maschinenbau Gmbh, 6603 Sulzbach | Druckuebersetzte kraftzylindereinheit |
DE20100122U1 (de) * | 2001-01-05 | 2001-06-21 | Reiplinger, Günter, 54669 Bollendorf | Druckübersetzer |
WO2010070053A1 (de) * | 2008-12-17 | 2010-06-24 | Bühler Druckguss AG | Anordnung für eine druckgiessmaschine und verfahren zum betreiben eines antriebskolbens der druckgiessmaschine |
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DE2017951C2 (de) * | 1970-04-15 | 1978-10-05 | Wotan-Werke Gmbh, 4000 Duesseldorf | Druckgießmaschine mit Multiplikator |
CH497221A (de) | 1968-09-30 | 1970-10-15 | Buehler Ag Geb | Druckgiessmaschine |
JPH0620634B2 (ja) | 1985-02-23 | 1994-03-23 | 東芝機械株式会社 | 射出機の射出増圧制御装置 |
JP3332871B2 (ja) * | 1998-11-02 | 2002-10-07 | 東芝機械株式会社 | ダイカストマシンの射出制御方法および装置 |
JP3364215B1 (ja) | 2002-03-12 | 2003-01-08 | 有限会社本田製作所 | 複動式増圧シリンダ及びシリンダ内増圧方法 |
JP3828857B2 (ja) | 2002-11-12 | 2006-10-04 | 東芝機械株式会社 | ダイカストマシンの射出装置 |
JP3828842B2 (ja) | 2002-08-01 | 2006-10-04 | 東芝機械株式会社 | ダイカストマシンの射出装置 |
JP2005021976A (ja) | 2003-07-03 | 2005-01-27 | Sanko Shoji Co Ltd | ダイカスト鋳造機 |
JP2005083512A (ja) | 2003-09-10 | 2005-03-31 | Koganei Corp | 流体圧シリンダ |
DE102004010438B3 (de) * | 2004-03-01 | 2005-06-30 | Farger & Joosten Maschinenbau Gmbh | Hydropneumatischer Druckübersetzer mit Axial- und Radialdichtungen |
WO2008086181A1 (en) | 2007-01-05 | 2008-07-17 | Buhlerprince, Inc. | Die casting machine with reduced static injection pressure |
DE102008055542A1 (de) | 2008-12-17 | 2010-07-01 | Bühler Druckguss AG | Druckübersetzer mit integriertem Rückschlagventil |
CN204194765U (zh) | 2014-09-16 | 2015-03-11 | 天津千鑫有色金属制品有限公司 | 一种压铸机增压压射装置 |
JP6146878B2 (ja) * | 2015-01-09 | 2017-06-14 | 東芝機械株式会社 | 射出装置、成形装置及び成形方法 |
-
2015
- 2015-02-09 DE DE102015202273.0A patent/DE102015202273A1/de not_active Ceased
-
2016
- 2016-02-09 ES ES16706148T patent/ES2774500T3/es active Active
- 2016-02-09 WO PCT/EP2016/052690 patent/WO2016128381A1/de active Application Filing
- 2016-02-09 JP JP2017541806A patent/JP6787905B2/ja active Active
- 2016-02-09 CN CN201680020785.6A patent/CN107427909B/zh active Active
- 2016-02-09 EP EP16706148.0A patent/EP3256277B1/de active Active
- 2016-02-09 US US15/549,464 patent/US11015619B2/en active Active
- 2016-02-09 MX MX2017010194A patent/MX2017010194A/es unknown
-
2018
- 2018-05-29 HK HK18106980.9A patent/HK1247590A1/zh unknown
-
2020
- 2020-12-21 US US17/128,698 patent/US11649836B2/en active Active
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DE3145401A1 (de) * | 1981-11-16 | 1983-05-26 | Unima Maschinenbau Gmbh, 6603 Sulzbach | Druckuebersetzte kraftzylindereinheit |
DE20100122U1 (de) * | 2001-01-05 | 2001-06-21 | Reiplinger, Günter, 54669 Bollendorf | Druckübersetzer |
WO2010070053A1 (de) * | 2008-12-17 | 2010-06-24 | Bühler Druckguss AG | Anordnung für eine druckgiessmaschine und verfahren zum betreiben eines antriebskolbens der druckgiessmaschine |
Also Published As
Publication number | Publication date |
---|---|
EP3256277B1 (de) | 2019-12-04 |
US20180023597A1 (en) | 2018-01-25 |
US11649836B2 (en) | 2023-05-16 |
CN107427909B (zh) | 2019-11-05 |
HK1247590A1 (zh) | 2018-09-28 |
ES2774500T3 (es) | 2020-07-21 |
CN107427909A (zh) | 2017-12-01 |
JP6787905B2 (ja) | 2020-11-18 |
US11015619B2 (en) | 2021-05-25 |
DE102015202273A1 (de) | 2016-08-11 |
JP2018508363A (ja) | 2018-03-29 |
US20210108655A1 (en) | 2021-04-15 |
MX2017010194A (es) | 2017-12-04 |
EP3256277A1 (de) | 2017-12-20 |
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