EP3140065A2 - Verfahren zum betreiben einer vakuumdruckgussmaschine - Google Patents
Verfahren zum betreiben einer vakuumdruckgussmaschineInfo
- Publication number
- EP3140065A2 EP3140065A2 EP15719481.2A EP15719481A EP3140065A2 EP 3140065 A2 EP3140065 A2 EP 3140065A2 EP 15719481 A EP15719481 A EP 15719481A EP 3140065 A2 EP3140065 A2 EP 3140065A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- casting
- chamber
- die
- casting chamber
- negative pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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
- B22D17/08—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled
- B22D17/10—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled with horizontal press motion
-
- 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
- B22D17/14—Machines with evacuated die cavity
-
- 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
- B22D17/32—Controlling equipment
Definitions
- the present invention relates to a method for operating a vacuum pressure casting machine with which a casting cycle can be carried out effi cient ⁇ and faster.
- a die casting machine includes fully a casting mold which consists of at least two mold halves (ei ⁇ ner fixed and a movable mold half), which together form a corresponding to the component to be produced cavity (also referred to as a cavity or shape contour).
- a melt of the material to be molded in ⁇ example aluminum, using a casting piston at high speed and high pressure pressed.
- the mold is opened by movement of the movable mold half and eject the finished molded casting with the aid of ejectors.
- WO 2008/131571 A1 describes a horizontal two-plate die-casting machine.
- This two-plate die casting machine comprises a movable clamping plate (BAP) and a fixed clamping plate (FAP), to each of which a
- Mold half is arranged.
- the die By moving the movable platen, the die can be opened and closed.
- the two clamping plates In the closed position, the two clamping plates are pressed firmly against one another so that the two mold halves form a closed mold.
- a molten metal is introduced under pressure and cooled under He ⁇ stiffening.
- the solidified casting can after opening the Form (by moving the movable platen) are removed.
- the die casting machine with a powerful vacuum equipment (in particular a powerful vacuum pump and a good vacuum regulation) is provided and the mold and Giessgarnitur can be sealed well against the environment.
- a powerful vacuum equipment in particular a powerful vacuum pump and a good vacuum regulation
- a flow channel is provided in the casting mold, which flows out of the cavity (Also referred to as cavity or shape contour), which corresponds to the component to be produced, leads into a gas line, wel ⁇ che is connected to a vacuum pump.
- the fluidic connection between Ver ⁇ cavity and vacuum pump can by means of a closing device, preferably a valve opened, and ge ⁇ closed.
- the casting chamber can also be connected via a suction hole arranged in the casting chamber to a vacuum pump in order to be able to carry out the process of evacuating the machine even faster or more efficiently.
- the fluidic connection between the casting chamber and the vacuum pump can be opened and closed by means of a closing device, preferably a valve.
- a corresponding Vakuumdruckgussma ⁇ machine is shown for example in DE 10 2004 057 324 AI.
- Fig. 1 In the first phase of a casting cycle, make sure that the casting piston does not exceed a certain critical speed. This is shown in Fig. 1.
- the casting piston pushes a wave of melt in front of it as it moves within the casting chamber.
- a gas space remains in the casting chamber above the melt, which increases the risk of air inclusions.
- the melt shaft rolls over, which also leads to air inclusions.
- the wave of melt has an optimum height (FIG. 1b), and the risk of air pockets is minimized.
- the implementation of a casting cycle in a die casting machine is carried out on the basis of the so-called casting curve.
- Under the pouring curve is defined as the course of the casting plunger in from ⁇ dependence of Giesskolbenwegs or after finishing ⁇ mold filling the course of the casting pressure as a function of time.
- the casting curve is divided into three phases.
- the melt is first dammed up in the casting chamber with a comparatively low piston speed and transported in the direction of the mold cavity.
- the second phase of the injection plunger will be ⁇ accelerated to a high speed to fill the component cavity completely within a very short time.
- the casting curve is still being created empirically by the person operating the die casting machine. To overcome the associated shortcomings, automation of the casting curve making process would be highly desirable. It was the object of the present invention to provide a method for operating a vacuum die casting machine with which a casting cycle can be carried out more efficiently and faster.
- the above object is achieved by determining the position of the filling opening in the casting chamber or other openings in the casting chamber in a previous learning cycle.
- the present invention thus relates to a method for loading ⁇ humor of the position of at least one opening in a casting chamber of a die casting machine, with a casting piston is contained in the casting chamber, comprising the steps of:
- the positions of the openings in the casting chamber are geometric parameters of the die-casting machine which do not remain constant but are subject to changes, for example, due to changes in shape or wear.
- the positions of the openings in the casting chamber are therefore to be determined regularly.
- the at least one opening is the filling opening of a casting chamber of a cold chamber die casting machine.
- Casting chambers of cold chamber die casting machines are well known.
- a casting piston which can be moved by means of a casting cylinder, preferably hydraulically.
- the casting piston is dimensioned in a vacuum die casting machine such that it divides the casting chamber into an annular space and a piston space, which are fluidically sealed against one another.
- the casting chamber is filled with the material to be poured via a filling opening.
- this is a molten metal of conventionally used for die-casting is implemented ⁇ metals or metal alloys. But it is also possible to use other melts. For example, salt cores can be produced from corresponding salt melts.
- the filling opening is preferably arranged in a horizontally arranged casting chamber in the ceiling of the casting chamber.
- the casting chamber of a vacuum die casting machine is in Verbin ⁇ -making to the actual mold cavity.
- the filled in the casting chamber melt is transferred by movement of the casting piston in the mold cavity, where it solidifies and forms the actual casting ⁇ tee.
- a Strö ⁇ flow duct is provided which leads out of the mold cavity in a Gaslei ⁇ device (connecting line) which is connected to a vacuum pump.
- the fluidic connection between the cavity and vacuum pump can thus take place through a suction hole, wherein the connection with the aid of a closing device, preferably a valve, can be opened and closed.
- a closing device preferably a valve
- the filling opening In order to generate negative pressure in the casting chamber and thus also in the mold cavity, the filling opening must be sealed. This can be achieved by moving the casting piston within the casting chamber into a position in which it fluidically decouples the part of the casting chamber in communication with the molding cavity from the filling opening. For this purpose, the casting piston must at least be moved to a position in which is its front end facing the mold end on the same Posi ⁇ tion as that of the mold facing the end of the filler opening is located. Once the casting piston has been moved to this position, an effective negative pressure in the mold cavity and the casting chamber can be generated with the aid of the vacuum pump.
- any vacuum pump can be used, as they are conventionally used in vacuum die-casting machines.
- Such vacuum pumps are known to the person skilled in the art.
- a negative pressure in the mold cavity and / or the Giesskam ⁇ mer of the vacuum die casting machine ie a below atmospheric pressure of 101,325 kPa (1.013 bar) lie ⁇ gender pressure.
- a tank This is a buffering container, which can be evacuated quickly with a comparatively small vacuum pump and in turn can quickly generate the desired negative pressure in a vacuum ⁇ die casting machine.
- the tank is arranged in a connecting line between the vacuum pump and die casting machine and can be opened and closed both with respect to the vacuum pump and with respect to the die casting machine by means of a closing device, preferably a valve. It is also known and possible to provide a plurality of such tanks between the vacuum pump and the mold cavity be ⁇ casting chamber.
- the above method for determining the position of the filling opening is carried out with the die closed and the connection of the casting chamber with a vacuum generating pump via a suction hole of the die.
- the casting chamber has its own intake opening through which it communicates with the Vaku ⁇ cuum.
- the fluidic connection between the casting chamber and the vacuum pump can be opened and closed by means of a closing device, preferably a valve. If present, this suction opening is located in a region of the casting chamber between the filling opening and the connection of the casting chamber to the mold cavity. Preferably, in a horizontally disposed casting chamber, the suction opening is arranged in the ceiling.
- the position of the suction opening can also be determined with the aid of the method according to the invention.
- the method is carried out with the die open and the connection of the casting chamber with a negative pressure generating pump or brought to the pump to negative pressure tank via the connected to a suction port in the casting chamber connecting line.
- the position of the filling opening of a casting chamber is determined in a first implementation of steps a) to c) with the die closed, as described above, and in a second implementation of steps a) to c) with an open die casting mold the position of the suction opening in the casting chamber determined by the suction port is connected to the vacuum generating pump or brought to the negative pressure pump on the tank via a connecting line, then the casting piston is moved to a position in which no communication between the suction port and the Giesshunt more is possible, and is determined based on the negative pressure in the connection ⁇ line, when the casting piston has reached this position.
- the suction opening is located in a region of the casting chamber between the filling opening and the connection of the casting chamber to the mold cavity.
- the casting piston in the casting chamber is moved in the direction of the suction opening, the casting piston finally reaches a position in which it seals the suction opening.
- the connecting line between intake and vacuum pump or tank now creates a negative pressure again. This negative pressure can be used to determine the position of the intake.
- the inventive method for Po ⁇ sitionsbetician of openings in a casting chamber as described above is thus carried out by determining a negative pressure at a certain position of the casting piston.
- the position of the casting piston at which the negative pressure at the measuring position becomes a predetermined value is taken as representative of the position of the entspre ⁇ sponding opening.
- the pressure measurement within the connecting lines from the vacuum pump or tank to the mold cavity or casting chamber preferably takes place.
- Devices for measuring pressure are known to the person skilled in the art.
- a gas cleaning device is preferably located between the vacuum-generating pump or the tank and the casting chamber. This is to prevent contamination of the vacuum pump by components of the melt, which could be sucked in by the vacuum pump.
- Such Gasrei ⁇ n may be sucked in by the vacuum pump.
- Such Gasrei ⁇ n such as filters, are known in the art.
- An inventively preferred Gastherapiesvorrich ⁇ tion is described in the European patent application no. EP 13178708.7 the same applicant. This is a gas cleaning device in which a Tangentialabscheider (cyclone cleaner) and a conventional filter element are sequentially arranged sequentially in a device.
- a pressure measurement upstream ⁇ Form Home and downstream of such gas cleaning device in order to detect a possible blockage of the Gaußsvorraum.
- the casting mold is closed at the beginning of the process and thus the mold cavity is sealed from the environment.
- the casting piston is now moved forward in the casting chamber until its front end has reached approximately the middle of the filling opening.
- the piston with a sufficient speed, for example in the range of 0.13 to 0.16 m / s, moved further forward, and the vacuum ⁇ pump is activated.
- the vacuum pump or the tank evacuated by it is connected to the suction hole of the mold cavity and / or the suction opening of the casting chamber.
- the pressure in the casting chamber sinks only marginally, since the filling opening is still partially open.
- the casting chamber is sealed from the environment, and the pressure in the casting chamber drops significantly. From a certain negative pressure can be assumed that the casting chamber is sealed from the environment.
- the position of the front, facing the mold end of the injection piston is determined and assumed to be representative of the position of the prede ⁇ reindeer, facing the shaped edge of the filling opening.
- the piston can now be stopped and the procedure for determining the position of the filling opening be terminated.
- the mold can now be opened and the vacuum pump switched off.
- the existing in the casting chamber vacuum disappears.
- the casting piston is moved in the casting chamber to a position in which its front end is located approximately in the middle of the suction opening.
- the vacuum pump is activated and the pump or a tank evacuated by it is connected via a connecting line with the suction opening of the casting chamber.
- the pressure in the connecting line drops only marginally, since the intake opening is still partially open.
- the casting chamber is sealed from the vacuum pump and the pressure in the connecting line between the vacuum pump and the casting chamber drops significantly. From a certain negative pressure, it can be assumed that the casting chamber is sealed off from the vacuum pump.
- the position of the front end of the casting piston is be ⁇ true and assumed as representative of the position of the edge of the intake. According to the invention, the position of the front end of the casting piston facing the mold, in which the second derivative of the pressure curve (cf., FIG. 3) assumes the value zero, ie, a point of inflection, is also used here.
- the thus determined position of the filling opening and optionally the suction opening of the casting chamber can be used to determine a casting curve.
- a casting curve for an inventive vacuum pressure casting ⁇ machine is essentially based on the speed of Giesskol ⁇ bens in the casting chamber.
- the speed of the Giesskol ⁇ bens must be carefully chosen in the casting chamber described with reference to Fig. 1 a) -c) to prevent unwanted air inclusions in the melt. It is advantageous to choose the speed of the casting piston in the Giess ⁇ chamber such that it as far as possible corresponds to the embodiment shown in Fig. La) -c) critical speed.
- the present invention thus further relates to a method for operating a vacuum pressure casting machine, characterized in that a casting curve for carrying out a Giesszyk- lus based on predetermined and / or experimentally determined characteristics of the die casting machine is determined by means of a Computerpro ⁇ program product for operation of the die casting machine ,
- the operator of the machine receives a Druckgussma ⁇ casting curve for carrying out a casting cycle superiors which allows the casting cycle to be carried out faster, especially in the first phase of the casting cycle.
- This casting curve is determined by a computer program product with which the die casting machine is operated.
- Computer program products for operating die casting machines are known.
- the program Dat @ net logon ⁇ rin be mentioned.
- Die casting machines have corresponding components such as processors and memory modules, with the help of a Com ⁇ computer program product can be operated.
- a sectional ⁇ spot such as a monitor and an associated input device such as a keyboard, mouse or touch screen, the die casting machine can be operated using the computer program product of Bedie ⁇ planning staff.
- the computer program product determines a casting curve on the basis of predetermined and / or experimente11 specific characteristics of the die casting machine. These characteristic values change, for example, depending on the die used or due to wear and must therefore be regularly adjusted or redetermined.
- the characteristic values for determining the casting curve can be entered manually into the computer program product. But these characteristics are accordance with the invention preferably at least partly ⁇ consistently experimentally determined and experimentally ⁇ len obtained data transferred directly to the computer program product.
- a desired negative pressure in a casting chamber and the associated closed mold cavity can only be produced when the casting chamber is sealed from the environment, i. the filling opening of the casting chamber is closed by the casting piston.
- According to an inventive embodiment is to iden averaging a casting curve previously a learning cycle performed, in which the evacuation time, ie the time to reach a predetermined negative pressure in the mold cavity, experimentally it is ⁇ averages.
- this learning cycle is carried out taking into account the position of the filling opening and optionally the suction opening of the casting chamber, which were determined by the method described above nen ⁇ . This allows for faster and more efficient process management.
- the die casting mold is closed and the casting piston within the casting chamber is moved to a position in which its front, the mold-facing end is located approximately at the height of the center of the filling opening.
- the casting chamber either directly via a Ansaugöff ⁇ tion of the casting chamber or indirectly via a suction hole of the mold cavity connected to the mold cavity, be connected to the vacuum pump BE relationship, as evacuated by the vacuum pump tank.
- the casting piston is moved as described above into a position in which it seals the casting chamber by closing the filling opening against the environment. It we now determines the time until the negative pressure in the casting chamber reaches a predetermined value.
- the time is preferable in the invention to reach a negative pressure until a negative pressure is determined corresponding to 100% of the preset negative pressure in the Formkavi ⁇ ty corresponding to 90% of the predetermined vacuum pressure in the mold cavity and the time. This allows a more accurate determination of the radio ⁇ tion capability of the vacuum system of the die casting machine.
- the Un ⁇ tertik in the connected to the vacuum pump or an evacuated tank connection line is determined before it is fluidly connected to the casting chamber and / or the mold cavity.
- the corresponding negative pressure in the connecting line must be present. If the negative pressure determined the learning cycle in the first step in the link ⁇ pipe lie above the reduced pressure to be subsequently achieved in the casting chamber and / or the mold cavity, the learning cycle is aborted and an error analysis vorzuneh ⁇ men (for example, search for a leak in the apparatus or after a clogged gas cleaning device).
- the learning cycle is performed as described above.
- the evacuation time to be determined, but the overall condition of Va ⁇ kuumsystems.
- a predetermined negative pressure in a predetermined time must be able to be achieved, for example, a vacuum of 100 mbar within 3 seconds from sealing the casting chamber from the environment. Should within the learning cycle these predetermined Values are not reached, a fault analysis fürzuprint ⁇ ren before the actual die-casting process is initiated.
- the value determined in this way can be used to evaluate the suction capacity of the vacuum device of the die casting machine .
- the time until a predetermined negative pressure in the mold cavity is reached is checked at regular intervals in order to identify any leaks or clogging of a gas cleaning device.
- the casting curve is additionally determined as a function of the degree of filling of the casting chamber.
- the degree of filling in the casting chamber i. the amount of melt in the casting chamber in relation to the maximum amount of melt to be poured into the casting chamber is an essential factor for the behavior of the melt in the casting chamber, as shown in FIG.
- the computer program product determines the casting curve ⁇ a cold chamber die casting machine according to the invention preferably in Depending ⁇ speed of the ascertained in the learning cycle evacuation time as well as of a predetermined degree of filling.
- a degree of filling of the casting chamber of from 20 to 50%, preferably from 30 to 40%, based on a casting chamber having a casting piston in the starting position (ie in the position as far as possible from the mold), is preferably used.
- the computer program product for the determination of the casting curve prefers further geometric characteristic data the die-casting machine used.
- the positions of the filling opening and the suction opening of the casting chamber determined in the previous positioning method are taken into account in order to optimally adjust the speed of the casting piston and the process of evacuation of the casting chamber and the mold cavity.
- the speed of the casting piston is determined at a position in which its front end to the mold wall fed ⁇ th edge has reached the suction opening located in the casting chamber. According to the invention this speed is in From ⁇ dependence determined by the reciprocal of the degree of filling of the casting chamber and taken into account in the calculation of the other points of the casting curve.
- the diameter of the casting piston the ak ⁇ tive length of the casting chamber (ie, standing for the casting process available length of the casting chamber), the weight of the manufactured cast ingot (with and without bleed), the density of the casting and the density factor liquid / solid considered the be translated ⁇ th melt.
- the casting curve is thus determined case-specifically on the basis of predetermined and / or previously determined characteristic data with the aid of a computer program product.
- One skilled in the art may make necesser ⁇ surface modification of a computer program product conventionally used in vacuum pressure casting ⁇ machine basis of his expert knowledge and, where necessary, when the casting curve determined by the computer program product when Druckgusspro- process does not provide optimum and / or desired results. With the help of the present invention, it is possible to
- Casting cycle in particular the first phase of the casting cycle, faster and more efficient.
- a time saving of 1 to 10 s, preferably 2 to 5 s, can be achieved per casting cycle. In the production of castings in large quantities, this results in a significant economic advantage.
- the present invention further relates to a Computerpro ⁇ program product for operating a vacuum pressure casting machine, wherein the software product executes the step of determining a casting curve for carrying out a casting cycle based on predetermined and / or experimentally determined characteristics of the die casting machine.
- Computer program products for operating die casting machines are known.
- the program Dat @ net logon ⁇ rin be mentioned.
- the inventive computer program product ent ⁇ speaks preferably such a known Computerprogrammpro ⁇ domestic product and has been modified so that it can perform the inventive step of determining a casting curve described above.
- the skilled artisan can make the necessary modification of a computer program product conventionally used in vacuum die casting machines due to its auswis ⁇ sens and if necessary adjust, when the casting curve determined by Compu ⁇ program product does not provide optimal and / or desired results at the pressure casting process.
- Fig. 2 A schematic representation of an embodiment ⁇ form of an inventive die casting machine
- Fig. 3 is a schematic representation of an embodiment ⁇ form the vacuum arrangement of an inventive die casting machine
- Fig. 4 is a schematic representation of an embodiment ⁇ form of the inventive method for determining the position of the filling opening and the suction port
- FIG. 2 shows a schematic illustration of an embodiment of a die-casting machine 1 according to the invention. It is a cold chamber vacuum die casting machine.
- the pressure casting machine 1 5 comprises a movable platen 2 arranged thereon half-mold 4 and a fixed Aufspannplat ⁇ te 3 arranged thereon mold half, the mold halves 4 and 5 form in the closed condition, the mold cavity 11 from corresponding wel ⁇ cher the shape of the casting to be produced.
- the die-casting machine 1 according to FIG. 2 furthermore has a
- Casting chamber 6, which corresponds through the fixed platen 3 and the mold half 5 to the mold cavity 11 and is in fluid communication with the mold cavity 11.
- the casting piston 7 has a front end 7a and is connected via the casting rod 8 to a casting cylinder (not shown).
- a filling opening 9 for filling the casting chamber 6 with melt and a suction opening 10 for connecting the casting chamber 6 with a vacuum pump 17 are arranged.
- the mold cavity 11 is connected via a flow line 12 and a valve 13 (referred to as chill-vent) in fluid communication with the vacuum pump 17.
- the suction port 10 and the flow ⁇ line 12 are connected via lines 14 and 15 to a tank 16.
- the tank 16 may be 11 generate a desired negative pressure to be evacuated via the vacuum pump, and in turn in the casting chamber 6 and the mold ⁇ cavity.
- This arrangement has the advantage that with a comparatively small variation Cooling pump in the tank 16 a comparatively large volume can be brought to the desired negative pressure.
- This tank volume can be used, in a short time interval in the casting chamber 6 and the mold cavity 11 to produce a ge ⁇ desired underpressure.
- the time can be used during the casting cycle to re-establish the vacuum pump 17 in the tank 16 the desired negative pressure, to 6 and the shape ⁇ cavity 11 to be able to set a desired negative pressure again if necessary in the casting chamber.
- FIG. 3 is a schematic representation of an embodiment ⁇ form of the vacuum arrangement of a die casting machine according to the invention is shown, wherein like reference numerals in Figures 1 and 2 denote the same elements.
- the casting chamber 6 comprises a suction opening 10 which is connected via a connecting line 15 to a tank 16 which can be evacuated by a vacuum pump 17.
- a gas cleaning device 20 is arranged in the connecting line 15 . It is preferable that in the tung Gasworkssvorrich ⁇ a device, such as the same Applicant is described in European patent application no. EP 13178708.7. This is a gas cleaning device in which a Tangentialabscheider (cyclone cleaner) and a conventional filter element are sequentially arranged sequentially in a device.
- pressure measuring means 19 Upstream and downstream of the gas purification device 20 pressure measuring means 19 are arranged, which via valves 21 can be decoupled from the connecting line 15. With the pressure measuring devices 19, the pressure in the connecting line 15 and thus in the casting chamber 6 can be determined. In addition, it can be checked with the pressure measuring devices 19, whether the gas cleaning device 19 is functional or, for example, clogged.
- the casting chamber 6 can be decoupled from the tank 16 and the vacuum pump 17 by means of a valve 22.
- the mold cavity 11 is connected via a flow channel 12 and a connecting line 14 with the tank 16, which can be evacuated by a vacuum pump 17. Also in the connecting line 14, a gas cleaning device 20a is arranged.
- the gas purification device is preferably a device as described in the European patent application no. EP 13178708.7 of the same Applicant. This is a gas cleaning device in which a device in a tangential separator (cyclone cleaner) and a conventional filter element are arranged sequentially aufeinan ⁇ der devisd.
- a pressure measuring device 19 is arranged, which can be decoupled via a valve 21 from the connecting line 14. With the pressure measuring device 19, the pressure in the connecting line 14 and thus in the mold cavity 11 can be determined.
- the vacuum cavity 11 can be decoupled from the tank 16 and the vacuum pump 17 by means of a valve 23.
- a valve 23 Optional may be integrally Schlos ⁇ sen to the system a hydraulic closing unit 24 which can be decoupled via a valve 25, as shown in Fig. 3.
- FIG. 4 is a schematic representation of an execution ⁇ form of the inventive method for determining the position of the filling opening and the suction opening is shown.
- FIG. 4 the pressure curve during the performance of erfindungsge ⁇ MAESSEN process depending on the position of the Giesskol- bens is shown.
- the casting piston 7 is in the casting chamber 6 in a position s ⁇ , o, in which the filling opening 9 of the casting chamber 6 is not sealed and located in the piston chamber of the casting piston 7.
- the mold halves 4 and 5 are closed by movement of the movable platen 2 in closed position, so that the mold cavity is sealed from the environment at ⁇ .
- ⁇ point prevails in the casting chamber 6 normal pressure (about 1000 mbar), since the casting chamber 6 via the filling opening 9 is in contact with the environment.
- the casting piston 7 is now moved in the casting chamber 6 in a position in which its front end 7a is located approximately at the level of the center of the filling opening 9 (position "Vacuum
- valve 13 to the mold cavity 11 is closed and the valve 22 is opened to the intake opening 10.
- valve 22 can also be closed to the intake opening 10 and the valve 13 can be opened to the mold cavity 11.
- a slight pressure drop ⁇ ⁇ occurs in FIG the casting chamber 6.
- the casting piston 7 is now moved in the casting chamber 6 until its front end 7a reaches the edge of the filling opening 9 facing the mold.
- This position is called s ho i fin. From this position s ho i In the casting piston 7, the casting chamber 6 is sealed against the environment and there is a significant pressure drop. The casting piston is moved a little further up to a position at which the pressure curve has a turning point, ie the second derivative of the pS curve assumes the value 0.
- This ⁇ positi on is referred to as P s h e ffi and as representative of the Po ⁇ sition of the filling opening 9 (more precisely, its shape facing edge) viewed.
- the casting piston 7 is now stopped and the evacuation of the casting chamber 6 is ended.
- the tank 16 is evaku ⁇ ated with the vacuum pump 17 to the desired value, and the mold halves 4 and 5 are opened from each other by movement of the movable platen 2 in the open position (position "vacuum stop 1").
- Characterized the mold cavity 11 is contact with the Environment, and the pressure in the casting chamber 6 connected to the mold cavity 11 rises again to normal pressure, and the casting piston 7 in the casting chamber 6 is then moved to a position in which its front end 7a is approximately at the level of the center of the suction opening 10 is located (position "Vacuum start”).
- the valve 13 to the mold cavity 11 is closed and the valve 22 to the intake port 10 is opened.
- the evacuation of the connecting line 15 is now ended. If the casting piston 7 is now moved further forward in the casting chamber 6, it releases the suction opening 10 from the position "vacuum stop 2." The connecting line 15 thereby comes into contact with the casting chamber 6 and the mold cavity 11, which is in contact with the environment Contact ste ⁇ hen. Thereby, the pressure in the connecting line 15 rises again to approximately atmospheric pressure.
- the evacuation times tl and t2 are illustrated, which are determined currency ⁇ rend a learning cycle of an inventive embodiment of the present invention.
- the time period tl corresponds to the period in which the direction indicated by the bold line curve A pressure variation in the kauslei ⁇ tung 14 or 15 between the casting chamber 6 or mold cavity 11 and through the vacuum pump 17 evacuated tank 16 corresponds to a pressure drop from atmospheric pressure to a value of corresponds to the predetermined, to be reached negative pressure to 90%.
- the period of time t2 corresponds to the period in which the direction indicated by the bold line curve A pressure variation in the kauslei ⁇ tung 15, 15 between the casting chamber 6 or mold cavity 11 and through the vacuum pump 17 evacuated tank 16 a pressure drop of the level reached after the time tl value corresponds to the predetermined, to be reached negative pressure.
- the thin curve B corresponds to the parallel pressure curve in the tank 16. There, the pressure rises by receiving gas from the casting chamber 6 or mold cavity 11 at. Before the next evacuation, the tank 16 must be brought back to the appropriate negative pressure.
- FIG. 6 shows an example of a casting curve according to the invention. Shown is the course of the speed of the Giesskolbens 7 as a function of the piston stroke and the Variegated ⁇ tion of the degree of filling of the casting chamber 6 in response to the Be ⁇ movement of the casting piston 7.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14167184 | 2014-05-06 | ||
PCT/EP2015/059779 WO2015169777A2 (de) | 2014-05-06 | 2015-05-05 | Verfahren zum betreiben einer vakuumdruckgussmaschine |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3140065A2 true EP3140065A2 (de) | 2017-03-15 |
Family
ID=50678015
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15719481.2A Withdrawn EP3140065A2 (de) | 2014-05-06 | 2015-05-05 | Verfahren zum betreiben einer vakuumdruckgussmaschine |
Country Status (4)
Country | Link |
---|---|
US (1) | US20170182552A1 (de) |
EP (1) | EP3140065A2 (de) |
CN (1) | CN106457373A (de) |
WO (1) | WO2015169777A2 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107335789B (zh) * | 2017-08-30 | 2023-06-16 | 鞍山海望真空设备制造有限公司 | 双独立系统压铸高真空装置 |
CN107649660A (zh) * | 2017-09-01 | 2018-02-02 | 东风精密铸造安徽有限公司 | 一种真空压铸双回路系统 |
JP7159745B2 (ja) * | 2018-09-25 | 2022-10-25 | トヨタ自動車株式会社 | 油分分離装置及び真空ダイカスト装置 |
CN110935863A (zh) * | 2018-09-25 | 2020-03-31 | 沈阳明瑞汽车部件有限公司 | 一种新型抽真空熔杯 |
CN109175297B (zh) * | 2018-11-09 | 2024-07-02 | 杭州龙盛工贸有限公司 | 一种防水型安防监控设备结构件的压铸装置 |
CN116833388B (zh) * | 2023-09-04 | 2023-12-15 | 宁波吉烨汽配模具有限公司 | 一种用于钣金的压铸设备 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5511605A (en) * | 1993-07-07 | 1996-04-30 | Toshiba Kikai Kabushiki Kaisha | Method and apparatus for vacuum die casting |
JP3490188B2 (ja) * | 1995-06-08 | 2004-01-26 | 東芝機械株式会社 | 真空ダイカストにおける真空制御方法およびその装置 |
JP3373362B2 (ja) * | 1996-07-22 | 2003-02-04 | 東芝機械株式会社 | ダイカスト金型キャビティの圧力監視装置 |
US6082438A (en) * | 1997-10-08 | 2000-07-04 | Outboard Marine Corporation | Method and system for the control of a vacuum valve of a vacuum die casting machine |
JPH11254118A (ja) * | 1998-03-16 | 1999-09-21 | Toshiba Mach Co Ltd | 真空度調整装置 |
JPH11254117A (ja) * | 1998-03-16 | 1999-09-21 | Toshiba Mach Co Ltd | 真空度調整装置 |
DE10022560A1 (de) * | 2000-05-10 | 2001-11-15 | Fuchs Lubritech Gmbh | Druckgießmaschine |
JP3921513B2 (ja) * | 2002-04-17 | 2007-05-30 | 株式会社木村工業 | 成型装置及びそれに用いる型ユニット |
US7004223B2 (en) * | 2003-12-19 | 2006-02-28 | Spx Corporation | Method and apparatus for vacuum measurement during die casting |
DE102004057324A1 (de) * | 2004-11-27 | 2006-06-01 | Pfeiffer Vacuum Gmbh | Vakuumdruckgussverfahren |
DE102006010560A1 (de) * | 2006-03-06 | 2007-09-13 | Pfeiffer Vacuum Gmbh | Vakuumdruckgussanlage und Verfahren zum Betrieb |
DE102008055536A1 (de) * | 2008-12-17 | 2010-07-01 | Bühler Druckguss AG | Verfahren zum Betreiben eines Antriebskolbens einer Druckgiessmaschine und Vorrichtung zur Durchführung des Verfahrens |
CN103567413A (zh) * | 2013-09-30 | 2014-02-12 | 胜赛思精密压铸(扬州)有限公司 | 一种解决压铸产品气孔缺陷的压铸装置及其压铸过程 |
-
2015
- 2015-05-05 EP EP15719481.2A patent/EP3140065A2/de not_active Withdrawn
- 2015-05-05 WO PCT/EP2015/059779 patent/WO2015169777A2/de active Application Filing
- 2015-05-05 CN CN201580023250.XA patent/CN106457373A/zh active Pending
- 2015-05-05 US US15/308,677 patent/US20170182552A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
WO2015169777A2 (de) | 2015-11-12 |
WO2015169777A3 (de) | 2016-03-31 |
CN106457373A (zh) | 2017-02-22 |
US20170182552A1 (en) | 2017-06-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2015169777A2 (de) | Verfahren zum betreiben einer vakuumdruckgussmaschine | |
EP2239070B1 (de) | Giessvorrichtung | |
DE69515226T2 (de) | Verfahren und Vorrichtung zum Steuern eines Nachpresskolbens in Druckgiessmaschinen | |
EP1819465B1 (de) | Vakuumdruckgussverfahren | |
DE112013006075B4 (de) | Giessvorrichtung und Giessverfahren | |
DE3727640C2 (de) | ||
DE19705524A1 (de) | Verfahren und Vorrichtung zum Spritzgießen | |
EP2536519B1 (de) | Verfahren zu Einstellung des Formhohlraumdrucks in einer Druckgießmaschine | |
EP2946852B1 (de) | Vakuumdruckgussanlage und verfahren zum betrieb einer vakuumdruckgussanlage | |
DE2953474C2 (de) | Druckgießverfahren mit Nachverdichtung | |
DE1249464B (de) | Druckgießverfahren und Druckgießmaschine | |
EP2855051B1 (de) | Fördervorrichtung für eine metallschmelze in einem spritzdruckaggregat | |
DE102012023608A1 (de) | Verfahren und Vorrichtung zum Herstellen eines Formteils | |
DE102007060418B4 (de) | Verfahren und Vorrichtung zum Vakuum-Druckgießen zur Herstellung von porenarmen und warmbehandelbaren Gussteilen | |
EP3587286B1 (de) | Verfahren zur prozessparameterbestimmung an einer verpackungsmaschine | |
DE4313800B4 (de) | Vakuumdruckgussverfahren | |
EP2588261B1 (de) | Verfahren zum befüllen des formhohlraums einer druckgiessvorrichtung sowie ventilanordnung und druckgiessvorrichtung zur durchführung des verfahrens | |
DE69903862T2 (de) | Verfahren zum steuern der bewegung der pressplatten einer formanlage und formanlage | |
WO2007107223A1 (de) | Verfahren zum befüllen des formhohlraums einer druckgiessvorrichtung mit giessmaterial und druckgiessvorrichtung zur durchführung des verfahrens | |
DE2505648A1 (de) | Einspritzvorrichtung fuer spritzgussmaschinen | |
EP1284168B1 (de) | Verfahren zum Betrieb einer Warmkammer-Druckgiessmaschine und Druckgiessmaschine | |
EP3511090B1 (de) | Kaltkammerdruckgiessmaschine | |
DE112014004304T5 (de) | Hochdruckgussvorrichtung und Hochdruckgussverfahren | |
DE69808892T2 (de) | Verfahren und niederdruckgiessanlage mit keramischer kokille | |
DE102008055506A1 (de) | Druckgiessverfahren und Vorrichtung zum Druckgiessen |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20161027 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: BA ME |
|
DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
17Q | First examination report despatched |
Effective date: 20171013 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20180224 |