EP0577632A1 - Verfahren zum giessen von metallen sowie vorrichtung zur durchführung eines solchen verfahrens. - Google Patents
Verfahren zum giessen von metallen sowie vorrichtung zur durchführung eines solchen verfahrens.Info
- Publication number
- EP0577632A1 EP0577632A1 EP92906424A EP92906424A EP0577632A1 EP 0577632 A1 EP0577632 A1 EP 0577632A1 EP 92906424 A EP92906424 A EP 92906424A EP 92906424 A EP92906424 A EP 92906424A EP 0577632 A1 EP0577632 A1 EP 0577632A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- casting
- section
- mold
- channel
- pouring
- 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.)
- Granted
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
-
- 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
- B22D17/12—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled with vertical press motion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/02—Pressure casting making use of mechanical pressure devices, e.g. cast-forging
Definitions
- the invention relates to a method for casting metals, in particular alloys with a low melting point, in which the liquid metal is poured into a mold from bottom to top via a pouring channel and a pouring opening arranged at the lowest point of the mold , and a device for carrying out such a method.
- the object of the invention is therefore to develop a method or a device with which a casting can be produced without a sprue or sprue and can be used directly without reworking.
- this object is essentially achieved in that, after the casting mold has been completely filled and only partially solidified the metal in the casting mold, the casting pressure is reduced or switched off, so that a backflow of liquid metal from the casting mold via a return ⁇ flow channel, the cross section of which is substantially smaller than the cross section of the pouring channel, and that a stamp, the end face of which corresponds to the size and shape of the outer contour of the casting in the region of the pouring opening, at least over the last section of the pouring channel with displacement of this section existing liquid metal in the casting mold is adjusted so far in the direction of the inside of the casting mold until the end face of the stamp is aligned with the inner contour of the casting mold.
- the core Due to the adaptation of the end face of the stamp to the desired outer contour of the core in the region of the pouring opening, the core is now in a completely closed casting mold and solidifies without forming a pouring spigot to be reworked.
- the plunger displaces liquid material, which would not be possible with conventional methods, since the mold is completely filled with liquid metal without air pockets. Due to the backflow of the liquid metal according to the invention from the casting mold after reducing or switching off the casting pressure, however, a cavity is created in the casting mold, into which the stamp can push liquid metal when the pouring opening is closed.
- the control of the reflux quantity is achieved in that the cross section of the reflux channel is considerably smaller than the cross section of the pouring channel. This ensures that until the gate is closed by the plunger, not too much liquid metal has flowed back and the cavity inside the casting mold does not become too large.
- the stamp closes the pouring channel when the metal is pressed into the casting mold before the end face of the stamp is aligned with the inner contour of the casting mold. This ensures that the metal displaced by the punch is pressed securely into the casting mold and is not partially removed via the casting channel, which would prevent a defined filling of the cavity in the casting mold.
- the volume of the metal flowing back from the casting mold is greater than or equal to the volume V ⁇ of the metal displaced from the stamp into the interior of the casting mold is.
- a residual cavity which may always remain in the area of still liquid metal inside the casting mold, is kept very small by the method according to the invention and in no way limits the use of the casting. Defined conditions for the backflow of the liquid metal and the closing of the pouring opening are expediently achieved in that the stamp is adjusted by means of freely definable time control.
- the period of time for filling the casting mold via the pouring channel with metal is preferably approximately 20 seconds, the period of time from the end of filling the casting mold with metal to reducing or switching off the casting pressure is approximately 40 seconds and the entire period of time from the beginning of Pour the casting aisle until the gate is closed by the stamp for approx. 80 seconds. It has been found that if these standard times are observed, the cavity remaining in the casting mold can be kept very small or, in the ideal case, can even be avoided entirely.
- the invention is also directed to a device for carrying out the above method, which is characterized in that a check valve opening in the casting direction is arranged in the pouring channel outside the section covered by the stamp, and that a check valve bridging the check valve is arranged.
- the bypass duct for the check valve is provided in the pouring duct, the cross section of the return duct being substantially smaller than the cross section of the pouring duct.
- the check valve prevents the backflow of the liquid metal through the pouring channel after the casting pressure has been switched off, so that only a relatively small proportion of the liquid metal can flow back through the backflow channel bypassing the check valve.
- the ratio of the cross section of the return flow channel to the cross section of the pouring channel is in the order of 1:10 to 1:50.
- This cross section of the return flow channel can preferably be changed, for example by means of an adjusting screw, in order, if necessary, to be adapted to different conditions when casting different alloys.
- the solution according to the invention is characterized in that the pouring channel has a last section, seen in the filling direction, opening into the pouring opening, which runs coaxially with the punch and its direction of displacement, and that there is a laterally angled inlet section on the last section of the pouring channel , in which the check valve is arranged.
- the stamp is preferably guided in a bore of the casting mold, which runs coaxially to the last section of the casting channel, so that the stamp is fed exactly onto the pouring opening of the casting mold.
- the stamp Since the end face of the stamp is adapted to the desired outer contour of the casting, which may not be rotationally symmetrical, the stamp is preferably guided in the bore so that it cannot rotate.
- the necessary forces for moving the liquid metal are applied according to the invention in that the plunger can be driven hydraulically.
- the closing of the pouring channel after the pouring pressure has been switched off is ensured in that the check valve is pressed against a valve seat by a return spring.
- the metal in the pouring channel must be kept liquid so as not to impede the stamp when closing the pouring opening.
- the temperature in the pouring channel must therefore be greater than or equal to the melting temperature of the alloy to be cast, while the temperature of the casting mold in which the casting is to solidify must be lower. It is therefore provided in a development of the invention that a substantial part of the pouring channel and the stamp are arranged in a housing which is detachably connected to the casting mold with the interposition of a thermal barrier. This reduces the temperature loss from the housing to the mold.
- the single figure shows a schematic representation of a casting device according to the invention.
- Liquid metal in particular an alloy with a low melting point, is poured from bottom to top into a casting mold 3 consisting of two mold halves 1, 2 via a pouring channel 4 and a pouring opening 5 arranged at the lowest point of the casting mold 3.
- the liquid metal is pressed under pressure into the casting mold 3, the air contained in the casting mold 3 escaping through the gap 6 existing between the mold halves 1, 2.
- the gap 6 is too small for the liquid metal to flow through it could. In this way it is ensured that no unwanted attachment occurs in the parting plane of the casting mold 3.
- the metal contained in the casting mold 3 begins to solidify, progressing inwards beginning at the outer edges of the casting 7.
- the lines 8, 9 in the drawing each mean lines of the same solidification.
- the casting pressure is switched off.
- liquid metal flows out of the casting mold 3 under the action of gravity.
- the backflow of the liquid metal through the pouring channel 4 is prevented, however, by arranging in the pouring channel 4 a check valve 10 opening in the pouring direction, the valve body 24 of which is pressed by a return spring 11 against a valve seat 12 and thereby the pouring channel 4 is ver ⁇ in the absence of casting pressure closes.
- the return flow of the liquid metal can therefore only take place via a return flow passage 13, which bypasses the check valve 10 and acts as a bypass passage, the cross section of which is considerably smaller than the cross section of the pouring passage 4.
- the ratio of the cross section of the return flow passage 13 to the cross section of the Pouring channel 4 in the order of 1:10 to 1:50.
- the cross section of the return flow channel 13 is, for example Can be changed by means of an adjusting screw 14, in order, if necessary, to be able to make adjustments to different alloys and casting volumes.
- the pouring channel 4 is divided into a last section 16 opening into the pouring opening 5 and a laterally angled inlet section 17, in which the check valve 10 is arranged.
- a ram 18 can be displaced coaxially with the last section 16 of the casting channel 4 and is guided in a bore 19 of the casting mold 3 which runs coaxially with the last section 16 of the casting channel 4.
- the end face 20 of the stamp 18 corresponds to the size and shape of the contour of the casting 7 in the region of the gate opening 5. Since this contour of the casting 7 is generally not rotationally symmetrical, the stamp 18 is guided in the bore 19 in a rotationally secure manner.
- part of the liquid metal flows back from the casting mold 3 into the casting channel 4, as a result of which a cavity 15 is formed in the casting 7.
- the metal flows back very slowly due to the small cross section of the return flow channel 13, so that the size of the resulting cavity 15 can be precisely determined by time control.
- the die 18 is pushed forward, the liquid metal present in the last section 16 of the pouring channel 4 is pressed back into the casting mold 3.
- the amount of metal that has flowed back and thus the volume of the cavity 15 that is formed can be precisely matched to that of the metal that is pressed back into the casting mold 3 by the stamp 18, so that the cavity 15 is completely or at least almost completely filled again.
- the end face 20 of the stamp 18 corresponds in size and shape to the outer contour of the casting 7 in the region of the pouring opening 5, so that the inner contour of the completely closed casting mold 3 after the pouring opening 5 has been closed by the stamp 18 corresponds exactly to the desired outer contour of the casting 7 corresponds.
- a sprue or sprue therefore does not form, so that the casting 7 can be used after removal from the mold 3 without further processing.
- the stamp 18 is driven by a hydraulic drive 21.
- An essential part of the pouring channel 4 and the stamp 18 are arranged in a heatable housing 22, which is detachably connected to the casting mold 3 with the interposition of a thermal barrier 23.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Casting Devices For Molds (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4109793 | 1991-03-26 | ||
DE4109793A DE4109793A1 (de) | 1991-03-26 | 1991-03-26 | Verfahren zum giessen von metallen sowie vorrichtung zur durchfuehrung eines solchen verfahrens |
PCT/EP1992/000547 WO1992017296A1 (de) | 1991-03-26 | 1992-03-12 | Verfahren zum giessen von metallen sowie vorrichtung zur durchführung eines solchen verfahrens |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0577632A1 true EP0577632A1 (de) | 1994-01-12 |
EP0577632B1 EP0577632B1 (de) | 1995-06-07 |
Family
ID=6428164
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92906424A Expired - Lifetime EP0577632B1 (de) | 1991-03-26 | 1992-03-12 | Verfahren zum giessen von metallen sowie vorrichtung zur durchführung eines solchen verfahrens |
Country Status (6)
Country | Link |
---|---|
US (1) | US5447188A (de) |
EP (1) | EP0577632B1 (de) |
CA (1) | CA2106075A1 (de) |
DE (2) | DE4109793A1 (de) |
ES (1) | ES2074882T3 (de) |
WO (1) | WO1992017296A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9501263D0 (en) * | 1995-01-23 | 1995-03-15 | Snowden Pte Ltd | A door assembly |
DE10017393B4 (de) * | 2000-04-07 | 2008-04-30 | Volkswagen Ag | Verfahren zur Herstellung von Druckgußkörpern sowie Dauerform |
WO2002090020A1 (en) * | 2001-05-04 | 2002-11-14 | Alcast S.R.L. | Method and device for quickly and economically forming at least one die casting without casting material wastage |
ITMI20020223A1 (it) * | 2002-02-07 | 2003-08-07 | Claudio Frulla | Apparecchiatura per la realizzazione di oggetti in alluminio leghe dialluminio leghe leggere e simili |
GB2531663B (en) | 2015-12-02 | 2017-02-08 | Kws South Wales Ltd | Temperature controlled casting process |
EP3175938B1 (de) * | 2015-12-02 | 2020-09-30 | KWS South Wales Limited | Temperaturgesteuertes giessverfahren |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US969539A (en) * | 1908-06-16 | 1910-09-06 | Compressed Metal Company | Casting apparatus. |
DE597704C (de) * | 1932-04-08 | 1934-05-29 | Josef Polak | Verfahren und Vorrichtung zum Betrieb von Pressgussmaschinen |
DE2855200C2 (de) * | 1978-12-21 | 1982-05-27 | Owens-Illinois, Inc., 43666 Toledo, Ohio | Spritzvorrichtung zum Herstellen von Gegenständen aus thermoplastischem Kunststoff |
JPS55106668A (en) * | 1979-02-06 | 1980-08-15 | Hitachi Metals Ltd | Method and apparatus for constant rate feeding of molten metal |
JPS58125358A (ja) * | 1982-01-20 | 1983-07-26 | Hitachi Ltd | 溶湯鍛造装置 |
DE3528691A1 (de) * | 1985-08-09 | 1987-02-12 | Interatom | Verfahren und vorrichtung zum druckgiessen von fluessigmetall |
JPS63194864A (ja) * | 1987-02-06 | 1988-08-12 | Meichiyuu Seiki Kk | 溶融金属注湯方法 |
US4991641A (en) * | 1990-05-07 | 1991-02-12 | Electrovert Ltd. | Method of and apparatus for metal casting |
US5109914A (en) * | 1990-09-04 | 1992-05-05 | Electrovert Ltd. | Injection nozzle for casting metal alloys with low melting temperatures |
-
1991
- 1991-03-26 DE DE4109793A patent/DE4109793A1/de not_active Withdrawn
-
1992
- 1992-03-12 EP EP92906424A patent/EP0577632B1/de not_active Expired - Lifetime
- 1992-03-12 ES ES92906424T patent/ES2074882T3/es not_active Expired - Lifetime
- 1992-03-12 DE DE59202464T patent/DE59202464D1/de not_active Expired - Fee Related
- 1992-03-12 CA CA002106075A patent/CA2106075A1/en not_active Abandoned
- 1992-03-12 US US08/119,114 patent/US5447188A/en not_active Expired - Fee Related
- 1992-03-12 WO PCT/EP1992/000547 patent/WO1992017296A1/de active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9217296A1 * |
Also Published As
Publication number | Publication date |
---|---|
ES2074882T3 (es) | 1995-09-16 |
EP0577632B1 (de) | 1995-06-07 |
CA2106075A1 (en) | 1992-09-27 |
DE4109793A1 (de) | 1992-10-01 |
WO1992017296A1 (de) | 1992-10-15 |
US5447188A (en) | 1995-09-05 |
DE59202464D1 (de) | 1995-07-13 |
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