EP1146978A1 - Verfahren und vorrichtung zum herstellen von gussstücken - Google Patents
Verfahren und vorrichtung zum herstellen von gussstückenInfo
- Publication number
- EP1146978A1 EP1146978A1 EP00993169A EP00993169A EP1146978A1 EP 1146978 A1 EP1146978 A1 EP 1146978A1 EP 00993169 A EP00993169 A EP 00993169A EP 00993169 A EP00993169 A EP 00993169A EP 1146978 A1 EP1146978 A1 EP 1146978A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chamber
- unit
- volume
- walls
- inlet
- 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- Withdrawn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
- B22D17/20—Accessories: Details
- B22D17/2015—Means for forcing the molten metal into the die
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
- B29C45/54—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw
Definitions
- the invention relates to a method and to an apparatus for producing castings according to the preamble of claim 1 and claim 4, respectively.
- non-generic methods and devices are known, according to which semi-rigid, rod-shaped blanks are either forged or injected into a mold by means of a device not described in detail. From DE 35 00 561 A1 it is known to supply the material to be injected into the mold instead of with a piston device by means of a screw and also to build up the desired injection pressure by means of this screw.
- magnesium is a highly reactive material
- the devices used for casting magnesium require complex measures in order to prevent the ambient air from entering the magnesium melt.
- the invention has for its object to improve a generic method in such a way that this enables the processing of material with simple means excluding the external ambient atmosphere. Furthermore, the invention is based on the object of specifying a suitable device for this.
- the invention proposes to provide a shape-changing chamber from which the plasticized material can be injected directly into the casting mold or initially conveyed further indirectly and then injected into the casting mold from a separate injection unit.
- This variability in the shape of the chamber and the interior space that can be changed thereby, in particular the variable interior volume makes it possible to to minimize the injection process, to the extent that material is conveyed out of the chamber or injected into the mold and consequently the filling volume of the chamber decreases.
- the device can be designed to be comparatively simple and inexpensive.
- the inlet opening and the area of the material supply in front of it are decoupled from the actual injection process, so that pressure can build up in the chamber without backflow into the area of the material. supply can take place.
- the injection pressure curve can therefore be controlled precisely.
- the feed unit in the area of the material feed is not involved in the pressure build-up of the injection process and can accordingly be of a simpler design and easier to control, since it only has to feed the material into the chamber and accordingly essentially only monitors the feed pressure and possibly the temperature must become.
- An additional translational, axial mobility in the conveyor unit as is known in the case of rotary-driven screw conveyors for building up particularly high pressures or for faster injection processes, can be dispensed with, so that simplifications in the design area and with regard to the process control can be achieved.
- the method according to the invention and the device designed accordingly are suitable, for example, for processing magnesium, but this invention can also be used advantageously for processing other materials, in particular if such materials are to be processed in a manner sealed from the external atmosphere. It can be metals, plastics or other materials, these already being supplied to the device in liquid or at least partially liquefied form, or the device can have its own plasticizing unit which is connected upstream of the injection unit and into which solid, e.g. B. granular, input material is entered.
- Chamber walls for controlling the inlet and outlet openings the chamber ie in order to determine the opening and closing times of these openings, can be achieved, for example, by looking at the inlet and outlet of the chamber in the direction of movement of the movable chamber walls, so that movement of the chamber walls can be used to control whether the Inlet or outlet or both openings should be opened or closed at the same time.
- Such a closure also further excludes the possibility of allowing the ambient atmosphere to enter the chamber, since not only that
- Chamber content that is accessible for such an atmosphere is minimized, but the chamber can be closed properly.
- the Device have a tubular chamber, two opposite walls of this tube, for example the two end walls, being formed by the movable walls, these walls then being able to be driven together in the same direction or in opposite directions, in each case either at the same speed or at different speeds, to set the desired conditions inside the chamber.
- the tube can advantageously be designed as a cylinder with a round cross section, so that a comparatively simple reliable sealing of the movable walls with respect to the tube wall can be achieved.
- a screw can have different external geometries along its length in order to be able to process the material in correspondingly different ways during the material transport, for. B. to homogenize, mix, incorporate additives, shear or knead.
- Further conveying units can be connected upstream of the chamber, which, if necessary, can be configured as mixing, conveying and heating units similarly to the above-mentioned heated screw. Through this several conveyor units can be different
- Materials are introduced into the chamber: for example different materials or the same material with different temperatures.
- workpieces can be produced that have zones of different properties, e.g. B. fiber or particle-reinforced zones in the area of threads or abrasively stressed areas, or zones with a sandwich-like structure of the workpiece can result.
- each individual conveying unit or conveying and heating unit advantageously enables the desired dosages to be changed flexibly.
- the opening and closing of these openings can also be controlled by arranging and designing the inlet or outlet openings opening into the chamber and depending on the movement of the movable walls, so that either a basically fixed dosage ratio can be set or the dosage ratio can be influenced by a different control of the wall movements or in that the openings z. B. are variable by sliders.
- Each of the chambers can either be designed to supply a single material or, as mentioned, several different materials.
- granular or powdery particles such. B. SiC, Al 2 O 3 - or carbon particles
- the particles or fibers can be added by adding them directly and unmixed to the chamber.
- the addition advantageously takes place in that the basic material of the material is also supplied in this additional feed unit, for. B. plastic or light metal, but enriched with particles or fibers, so that the desired distribution of particles or fibers can be achieved and at the same time the desired composite material of the base material can be ensured in the workpiece to be produced.
- the particles or fibers are homogeneously mixed with the base material at an external point before entering the chamber and possibly even before entering the feed unit, for. B. by inductive or mechanical stirring.
- Fig. 1, 1 generally designates a device for the production of castings from scatterable, for. B. granular, raw material is used. In particular, it can be provided to process magnesium granules in a process similar to die casting or injection molding.
- an injection unit 2 is shown.
- Injection unit 2 is supplied with the plasticized, that is to say flowable, material by a plasticizing unit 3.
- the plasticizing unit 3 is provided with a screw which, on the one hand, heats the primary material by friction.
- the plasticizing unit 3 is heated to allow further heating of the primary material, and finally the screw also conveys the heated and flowable material through an inlet 4 into the injection unit 2.
- the plasticizing unit 3 thus initially represents a conveyor unit. Since granular starting material is used, the plasticizing unit 3 not only serves to transport this material, but also to soften or plasticize it. When using already liquid or pulpy primary material, the plasticizing unit 3, on the other hand, can be designed exclusively as a conveying unit, possibly with an additional mixing or homogenizing function, but without the task of softening or plasticizing the material.
- the material is then injected from the injection unit 2 through an outlet 5 into a casting mold 6 which is also only indicated schematically.
- the casting mold 6 can be cooled in order to enable rapid solidification and thus rapid removal of the casting from the casting mold 6.
- the injection unit 2 has a chamber 7 which can be filled or emptied through the inlet 4 and the outlet 5.
- the walls of chamber 7 are formed on the one hand by a cylindrical tube 8 and on the other hand by two movable walls 9 and 10, so that a cylindrical chamber 7 with movable end walls is created overall.
- the movable walls 9 and 10 can also be used as pistons
- connecting rods 11 and 12 can be moved, referred to as connecting rods 11 and 12. These connecting rods 11 and 12 can be firmly connected to the pistons 9 and 10, e.g. B. if they are only moved axially and are moved back and forth hydraulically, for example.
- connecting rods 11 and 12 there may also be an articulated connection of the connecting rods 11 and 12 to the pistons 9 and 10, e.g. B. if the connecting rods 11 and 12 are mechanically driven by means of cranks, cams or the like and should be deflected from their axially aligned arrangements shown in FIG. 1 and angled relative to the walls or pistons 9 and 10.
- Fig. 1 shows the beginning of a filling process for the chamber 7: From the plasticizing unit 3, the screw conveys the material that has become fluid into the inlet 4. Due to the correspondingly raised position of the upper piston 9 and the correspondingly lowered position of the lower piston 10, the inlet is 4 open to the chamber 7 so that the material can get into the chamber 7. First - as indicated by the vertical arrow - only the piston 9 is further raised with the aid of the connecting rod 11 in order to increase the volume of the chamber 7 so that it can hold an increasing amount of material. During this filling process, the lower piston 10, supported by the connecting rod 12, remains in a position in which it closes the outlet 5.
- Fig. 2 shows the beginning of the casting process: The lower piston 10 is pulled down by the connecting rod 12 and releases the outlet 5.
- the upper piston 9 is moved in the same direction, so that material already flows through the outlet 5 into the mold 6 due to the pressure prevailing within the chamber 7. Due to the filling pressure prevailing in the chamber 7, this also applies when the two pistons 9 and 10 are moved at the same speed, ie the chamber 7 with the same volume is only displaced.
- the chamber volume can be reduced and thus the pressure within the chamber 7 can be increased or the pressure which initially drops due to the material outlet can be maintained in favor of a faster casting process ,
- the movement of the pistons 9 and 10 can advantageously be controlled during this phase so that the pressure in the chamber 7 does not exceed the filling pressure, that is to say the pressure in the region of the plasticizing unit 3, so that a backflow of the material from the chamber 7 through the inlet 4 is avoided without having to provide check valves or the like.
- Fig. 3 shows a second phase of the casting process, in which the upper piston 9 closes the inlet 4. Now the relative speed between the lower piston 10 and the upper piston 9 can be increased, so that pressures can be built up inside the chamber 7 which are higher than the pressure inside the plasticizing unit 3. For this purpose, the lower piston 10 can be stopped completely or even in opposite directions can be moved towards the upper piston, or the speed of the upper piston 9 can be increased. Because the inlet 4 is closed, a backflow of the material from the chamber 7 into the plasticizing unit 3 is excluded.
- Fig. 3 shows a second phase of the casting process, in which the upper piston 9 closes the inlet 4.
- the screw of the plasticizing unit 3 is withdrawn from the inlet 4, so that it can initially convey material to the inlet 4 solely on account of its rotary movement and later translationally in order to refill the chamber 7 in addition to this rotary conveying movement can be moved in the direction of the inlet 4 in order to enable the chamber 7 to be filled particularly quickly.
- the screw is driven exclusively in rotation, since it is not involved in the pressure build-up in the chamber 7 during the casting process anyway.
- Tube 8 is raised, so that a remaining in the injection unit 2 pouring residue laterally from the injection unit 2 through a corresponding recess 14, which is provided in a machine plate 15, can be ejected.
- the upper piston 9 is pulled up as far as possible in accordance with the arrow indicated on the piston 9 in order to enable a correspondingly wide ejection opening for the chamber 7.
- the upper piston 9 is moved as close as possible to the lower piston 10, so that the chamber contents 7 are minimized or brought to zero, so that accordingly no air from the external atmosphere between the two pistons 9 and 10 can get.
- the two pistons are then moved down together and brought into the position shown in FIG. 1, in which a new working cycle of the injection unit 2 can then begin.
- the recess 14 and an adjoining receiving space for the pouring residue can be ejected through the recess 14 to seal against the external atmosphere, for example in the form of a closed container which receives the pouring residues and only has to be emptied in comparatively larger periods of time, or it can be provided to the recess 14 by a protective gas from the external atmosphere to have the shielded area connected, so that even if the two pistons 9 and 10 cannot be moved against one another down into the tube 8, the penetration of the outside atmosphere into the chamber 7 is avoided.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19956478 | 1999-11-24 | ||
DE19956478A DE19956478C2 (de) | 1999-11-24 | 1999-11-24 | Verfahren und Vorrichtung zum Herstellen von Gußstücken |
PCT/DE2000/004133 WO2001038023A1 (de) | 1999-11-24 | 2000-11-21 | Verfahren und vorrichtung zum herstellen von gussstücken |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1146978A1 true EP1146978A1 (de) | 2001-10-24 |
Family
ID=7930139
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00993169A Withdrawn EP1146978A1 (de) | 1999-11-24 | 2000-11-21 | Verfahren und vorrichtung zum herstellen von gussstücken |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1146978A1 (de) |
JP (1) | JP2003514670A (de) |
KR (1) | KR20010101651A (de) |
BR (1) | BR0007680A (de) |
DE (1) | DE19956478C2 (de) |
TW (1) | TW533104B (de) |
WO (1) | WO2001038023A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10017393B4 (de) * | 2000-04-07 | 2008-04-30 | Volkswagen Ag | Verfahren zur Herstellung von Druckgußkörpern sowie Dauerform |
WO2007098628A1 (de) * | 2006-03-01 | 2007-09-07 | Neopreg Ag | Vorrichtung zur Herstellung von angussfreien Formteilen im Spritz-Pressverfahren und im Spritz-Prägeverfahren |
DE102007001780A1 (de) * | 2007-01-05 | 2008-07-10 | Bühler Druckguss AG | Verfahren zur Herstellung von faserverstärkten Druckgiessteilen |
DE102007060418B4 (de) * | 2007-12-14 | 2010-11-11 | Martin Baumann | Verfahren und Vorrichtung zum Vakuum-Druckgießen zur Herstellung von porenarmen und warmbehandelbaren Gussteilen |
DE102008027682B4 (de) * | 2008-06-10 | 2011-03-17 | Eduard Heidt | Verfahren zum Herstellen von dünnwandigen und hochfesten Bauteilen |
CN110385415A (zh) * | 2018-04-19 | 2019-10-29 | 昆山汉鼎精密金属有限公司 | 成型模具于压铸机台及射出机台上的互换结构 |
EP3827913A1 (de) * | 2019-11-29 | 2021-06-02 | Heraeus Deutschland GmbH & Co KG | Spritzgusssystem für den spritzguss von amorphen metallen |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60147315A (ja) * | 1984-01-12 | 1985-08-03 | Toshiba Mach Co Ltd | 射出成形機の射出装置 |
JP2546077B2 (ja) * | 1991-03-25 | 1996-10-23 | 宇部興産株式会社 | 金型鋳造装置 |
IT1245268B (it) * | 1991-03-28 | 1994-09-13 | Int Press Dev Est | Gruppo di iniezione con ridotta inclusione di aria per macchina per pressofusione |
DE4310755C2 (de) * | 1993-04-01 | 1996-04-25 | Druckgusswerk Moessner Gmbh We | Druckgießvorrichtung |
JP2771512B2 (ja) * | 1996-05-22 | 1998-07-02 | 株式会社御池鐵工所 | 溶融可塑材の射出成形方法と装置 |
CA2227828C (en) * | 1997-01-31 | 2002-11-12 | Amcan Castings Limited | Semi-solid metal forming process |
DE19829336A1 (de) * | 1998-02-12 | 1999-08-26 | Didier Werke Ag | Verfahren zum Vergießen von Metallen unter Druck und Vorrichtung zur Durchführung des Verfahrens |
-
1999
- 1999-11-24 DE DE19956478A patent/DE19956478C2/de not_active Expired - Lifetime
-
2000
- 2000-11-21 JP JP2001539621A patent/JP2003514670A/ja active Pending
- 2000-11-21 WO PCT/DE2000/004133 patent/WO2001038023A1/de not_active Application Discontinuation
- 2000-11-21 EP EP00993169A patent/EP1146978A1/de not_active Withdrawn
- 2000-11-21 BR BR0007680-5A patent/BR0007680A/pt not_active Application Discontinuation
- 2000-11-21 KR KR1020017009281A patent/KR20010101651A/ko not_active Application Discontinuation
- 2000-11-24 TW TW089125026A patent/TW533104B/zh not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO0138023A1 * |
Also Published As
Publication number | Publication date |
---|---|
TW533104B (en) | 2003-05-21 |
KR20010101651A (ko) | 2001-11-14 |
BR0007680A (pt) | 2001-11-06 |
DE19956478A1 (de) | 2001-06-13 |
JP2003514670A (ja) | 2003-04-22 |
WO2001038023A1 (de) | 2001-05-31 |
DE19956478C2 (de) | 2001-10-18 |
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Legal Events
Date | Code | Title | Description |
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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 |
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17P | Request for examination filed |
Effective date: 20010620 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
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AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: HENGST GMBH & CO. KG |
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17Q | First examination report despatched |
Effective date: 20040322 |
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RBV | Designated contracting states (corrected) |
Designated state(s): DE ES FR GB IT SE |
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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 |
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18D | Application deemed to be withdrawn |
Effective date: 20050305 |