EP0733422B1 - Verfahren zur Herstellung von Formteilen aus Metall - Google Patents
Verfahren zur Herstellung von Formteilen aus Metall Download PDFInfo
- Publication number
- EP0733422B1 EP0733422B1 EP96810144A EP96810144A EP0733422B1 EP 0733422 B1 EP0733422 B1 EP 0733422B1 EP 96810144 A EP96810144 A EP 96810144A EP 96810144 A EP96810144 A EP 96810144A EP 0733422 B1 EP0733422 B1 EP 0733422B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- metal
- mold
- filling
- piston
- filling chamber
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/004—Thixotropic process, i.e. forging at semi-solid state
-
- 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
- B22D17/007—Semi-solid pressure die casting
-
- 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
Definitions
- the invention relates to a method for producing Molded parts made of metal according to the preamble of claim 1.
- thixoforms The process for the production of molded parts from thixotropic, i.e. partially solid / partially liquid, metal bolt is called Denote thixoforms. All come as metal bolts Bolts from a convertible to a thixotropic state Metal in question.
- the metal bolts can be made of Aluminum, magnesium or zinc and their alloys exist.
- thixotropic metal alloys The thixoforming of thixotropic metal alloys is in itself known. In this process the thixotropic properties partially liquid or partially solid metal alloys exploited. With thixotropic behavior of a metal alloy is understood that a suitably prepared Metal behaves unloaded like a solid, under However, shear stress reduces its viscosity to the extent that it is similar to a molten metal. This involves heating the alloy into the solidification interval between liquidus and solidus temperature required. The temperature should be set so that, for example a structure fraction of 20 to 80 wt.% melted the rest remains in solid form.
- Partially solid / partly liquid metal is used in thixoforming in the form of a thixotropic metal bolt in a common given horizontally arranged filling chamber and by Pressurizing a piston into a mold cavity introduced or shot, in which the thixotropic metal alloy solidifies.
- the mold filling with the partially solid / partially liquid metal takes place in thixoforming as a largely laminar flow.
- the metal forms a closed metal front, which the Air pushes in the direction of the ventilation ducts.
- the air can escape through these channels.
- the mold filling takes place relatively slowly, air and / or other gas components are included in the molded part, which in particular after heat treatment to porosity and can cause bubbles.
- the ventilation ducts can also be used over time, at least partially due to deposits Release agents are blocked. This leads to increased gas pressures in front of the metal front and thus increased gas absorption in the molding. Depending on the degree of contamination of the mold the gas porosity in the molded parts can therefore vary.
- the inventors have the Task, a method of the type mentioned to create with which the gas porosity in the molded parts can be further reduced.
- a method with the features of claim 1 leads to the achievement of the object according to the invention.
- a suitable thixoforming system has a filling chamber Picking up a thixotropic metal bolt, one to the filling chamber subsequent mold cavity and a piston for Pressing the metal bolt out of the filling chamber into the mold cavity on.
- the mold cavity stands with a vacuum container.
- the actuator has a control pin with a Closure head on, the closure head opening and Closing a directly adjoining the mold cavity Vent channel is used.
- the filling chamber can consist of a ceramic material, in particular of Si 3 N 4 . It is also possible to provide the filling chamber with heating devices. These heating devices can, for example, be arranged in the wall of the filling chamber as heating rods or as bores in which a heated medium such as oil flows.
- a thixoforming system 10 shown in FIG. 1 has with a horizontally lying cylindrical filling chamber 12 a filling chamber cavity 14. An opening 18 in the Filling chamber 12 is used to introduce a thixotropic metal bolt 20 in the filling chamber cavity 14. The displacement of the metal bolt 20 within the filling chamber cavity 14 takes place by means of a piston arranged in the filling chamber 12 16, which are moved in the direction of the filling chamber axis x can.
- the filling chamber 12 ends in a fixed mold plate 22, which a movable mold plate 24 is opposite.
- the two Mold plates 22, 24 each take a mold half 26, 28, which form a mold cavity 30 in the closed state, in which, after the metal has solidified, the molded part 32 arises.
- the mold cavity 30 has one or more ventilation channels 34, which may be combined into a collecting channel are.
- the Control pin 38 has a locking head 40 for opening or closing the ventilation channel 34.
- the postponement of the control pin 38 takes place on a flanged to the outside of the movable mold plate 24 Actuating cylinder 42. With this arrangement, the Maintain forced ventilation until the mold is completely filled become. Only when the mold has been filled the venting channel via the locking head 40 of the control bolt 38 34 closed at the end of the mold cavity 30.
- a vacuum line 44 connects to the control insert 36 connected to a vacuum container 48 via a valve 46 is.
- the vacuum container 48 is with a vacuum pump 50 evacuated and kept under vacuum.
- For pressure control manometers 52 are provided.
- the forced venting begins at the earliest when the piston 16 the opening 18 in the filling chamber 12 has closed and ends at the latest when the tool by separating the mold halves 26, 28 is opened again.
- Advantageous and practical Forced ventilation ends as soon as the mold is filled completed, i.e. the piston 16 no longer moves. Forced ventilation can of course also be done earlier end up.
- the switch-on and switch-off points for the forced ventilation can by means of displacement transducers arranged on the piston rod be determined. Switching on and off can also time, speed or pressure controlled. A another possibility is the use of metal front sensors, that trigger a circuit when the metal front is one reached certain point.
- the piston leads the metal to the gate, during a second filling phase, which begins at the time t E of the entry of the metal into the mold cavity, the mold cavity is filled with metal.
- the two filling phases are of approximately the same length and are, for example, 0.5 seconds each.
- the evacuation time is therefore less than 1 second.
- the gases can only be suctioned off when the piston has closed the filling opening.
- the speed of the piston cannot be reduced arbitrarily, since otherwise too much metal would solidify in the filling chamber.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
- Chemically Coating (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Powder Metallurgy (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
Description
- - Fig. 1
- einen Längsschnitt durch eine Thixoforming-Anlage mit Zwangsentlüftung;
- - Fig. 2
- einen typischen Ablauf einer Formfüllung beim Thixoformen.
- Vor der Formfüllung ist das Ventil geschlossen und die Vakuumpumpe 50 baut im Vakuumbehälter 48 einen Unterdruck auf.
- Während einer ersten Füllphase erfolgt ein gesteuertes Oeffnen des Ventils und damit der Beginn der Zwangsentlüftung.
- Bei erfolgter Formfüllung wird das Ventil geschlossen, damit kein Metall in den Vakuumteil der Anlage eintritt. Das Schliessen des Ventils ist auch notwendig, damit die Formhälften 26, 28 getrennt und damit die Form geöffnet und auch der Unterdruck im Vakuumbehälter 48 wieder aufgebaut werden kann.
Claims (3)
- Verfahren zur Herstellung von Formteilen aus Metall durch Einpressen eines thixotropen Metallbolzens (20) mit einem Kolben (16) aus einer Füllkammmer (12) in einen Formhohlraum (30),
dadurch gekennzeichnet,
dass der Formhohlraum (30) zumindest bis zum Zeitpunkt (tE) des Eintritts des Metalls in den Formhohlraum (30) zwangsentlüftet und die Kolbengeschwindigkeit nach dem Zeitpunkt (tE) des Eintritts des Metalls in den Formhohlraum (30) erhöht wird. - Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Zwangsentlüftung bis zur vollständigen Formfüllung aufrechterhalten wird.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Füllkammer (12) wärmeisolierend ausgestaltet ist und/oder beheizt wird.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH79795 | 1995-03-21 | ||
CH00797/95A CH689448A5 (de) | 1995-03-21 | 1995-03-21 | Verfahren und Vorrichtung zur Herstellung von Formteilen aus Metall. |
CH797/95 | 1995-03-21 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0733422A1 EP0733422A1 (de) | 1996-09-25 |
EP0733422B1 true EP0733422B1 (de) | 2000-02-09 |
Family
ID=4195412
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96810144A Expired - Lifetime EP0733422B1 (de) | 1995-03-21 | 1996-03-08 | Verfahren zur Herstellung von Formteilen aus Metall |
Country Status (11)
Country | Link |
---|---|
EP (1) | EP0733422B1 (de) |
JP (1) | JPH08257729A (de) |
AT (1) | ATE189634T1 (de) |
CA (1) | CA2170714A1 (de) |
CH (1) | CH689448A5 (de) |
DE (1) | DE59604390D1 (de) |
DK (1) | DK0733422T3 (de) |
ES (1) | ES2143743T3 (de) |
GR (1) | GR3033176T3 (de) |
NO (1) | NO312182B1 (de) |
PT (1) | PT733422E (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10022560A1 (de) * | 2000-05-10 | 2001-11-15 | Fuchs Lubritech Gmbh | Druckgießmaschine |
DE10043717A1 (de) * | 2000-09-04 | 2002-03-14 | Buehler Druckguss Ag Uzwil | Verfahren und Vorrichtung zum Druckumformen von metallischen Werkstoffen |
DE10144945B4 (de) | 2001-09-12 | 2005-05-04 | Alcan Bdw Gmbh & Co. Kg | Verfahren zum Steuern eines Vakuumventils einer Vakuumdruckgießvorrichtung sowie Vakuumdruckgießvorrichtung |
DE102009033532B4 (de) * | 2009-07-10 | 2020-11-19 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Extruder zur Herstellung eines Bauteils aus Leichtmetall |
JP5556108B2 (ja) * | 2009-09-25 | 2014-07-23 | トヨタ自動車株式会社 | 半溶融金属の鋳造方法、及び半溶融金属の鋳造装置 |
CN104259430B (zh) * | 2014-10-21 | 2016-03-30 | 湖南航天诚远精密机械有限公司 | 金属及其合金真空压铸成形装备及方法 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54151513A (en) * | 1978-04-27 | 1979-11-28 | Leibfried Dieter | Low pressure dieecasting of metal* particularly of ne metal and apparatus therefor |
CA2053990A1 (en) * | 1990-11-30 | 1992-05-31 | Gordon W. Breuker | Apparatus and process for producing shaped articles from semisolid metal preforms |
FR2671992B1 (fr) * | 1991-01-30 | 1997-08-01 | Transvalor Sa | Procede de coulee sous pression, a chambre froide. |
IT1245080B (it) * | 1991-04-19 | 1994-09-13 | Weber Srl | Procedimento per l'ottenimento di pressocolati ad alte prestazioni meccaniche mediante iniezione di una lega metallica allo stato semiliquido. |
-
1995
- 1995-03-21 CH CH00797/95A patent/CH689448A5/de not_active IP Right Cessation
-
1996
- 1996-02-29 CA CA002170714A patent/CA2170714A1/en not_active Abandoned
- 1996-03-08 ES ES96810144T patent/ES2143743T3/es not_active Expired - Lifetime
- 1996-03-08 DE DE59604390T patent/DE59604390D1/de not_active Expired - Fee Related
- 1996-03-08 DK DK96810144T patent/DK0733422T3/da active
- 1996-03-08 EP EP96810144A patent/EP0733422B1/de not_active Expired - Lifetime
- 1996-03-08 PT PT96810144T patent/PT733422E/pt unknown
- 1996-03-08 AT AT96810144T patent/ATE189634T1/de not_active IP Right Cessation
- 1996-03-15 JP JP8058889A patent/JPH08257729A/ja active Pending
- 1996-03-19 NO NO19961110A patent/NO312182B1/no not_active IP Right Cessation
-
2000
- 2000-04-07 GR GR20000400869T patent/GR3033176T3/el not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
PT733422E (pt) | 2000-06-30 |
JPH08257729A (ja) | 1996-10-08 |
NO312182B1 (no) | 2002-04-08 |
EP0733422A1 (de) | 1996-09-25 |
CH689448A5 (de) | 1999-04-30 |
GR3033176T3 (en) | 2000-08-31 |
NO961110L (no) | 1996-09-23 |
ATE189634T1 (de) | 2000-02-15 |
DE59604390D1 (de) | 2000-03-16 |
DK0733422T3 (da) | 2000-07-24 |
CA2170714A1 (en) | 1996-09-22 |
NO961110D0 (no) | 1996-03-19 |
ES2143743T3 (es) | 2000-05-16 |
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