EP0581201B1 - Verfahren zum Einbetten von Modellen für das Vollformgiessverfahren - Google Patents
Verfahren zum Einbetten von Modellen für das Vollformgiessverfahren Download PDFInfo
- Publication number
- EP0581201B1 EP0581201B1 EP93111778A EP93111778A EP0581201B1 EP 0581201 B1 EP0581201 B1 EP 0581201B1 EP 93111778 A EP93111778 A EP 93111778A EP 93111778 A EP93111778 A EP 93111778A EP 0581201 B1 EP0581201 B1 EP 0581201B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- moulding material
- molding material
- full
- model
- beat frequency
- 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
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
- B22C15/10—Compacting by jarring devices only
Definitions
- the main advantage of the full mold casting process over the usual hollow molding process using split permanent models is that a one-piece positive image of the casting as a model can be used and that no cores are needed to Fill in undercuts and interiors of the casting. This eliminates the effort for the production and insertion of the cores and for that Reworking inevitably in the mold division level and on the Ridges forming core brands.
- the object of the invention is therefore to provide a method for embedding
- this object is achieved in a method according to claim 1 solved in that the molding material is caused to beat during its entry into the molding container.
- the method according to the invention requires neither equipment nor control technology a special effort. Rather, it is sufficient to use the Vibration tables with two vibration exciters used in full mold casting equip, which are independently adjustable, so the optimal beat behavior can be selected for every application can. Also, the speed of the molding material no longer needs to be made dependent on the fill level of the molded container, but will (at least in the individual filling levels of the sand in the molding container) preferably kept constant.
- the drawing schematically shows a full-mold casting model 1 made of polystyrene rigid foam in the extreme shape of a dome open at the bottom, the inlet and any feeders are not shown.
- the model 1 is fastened in a sand-tight molded container 2.
- the location of the Model such that its hollow interior 3 only opens downwards due to casting technology and is the reason for when embedding the model in the molding material 4 (dry quartz sand occurring in this example Problems. If the model is positioned in such a way that the interior 3 opening up or to the side would make embedding problems expected to be controllable by the known vibration technology, but these two layers are disadvantageous in terms of casting technology.
- the molded container 2 is attached to a vibrating table 5, which with two vibration exciters operated at slightly different frequencies is set in beats that affect the incoming molding material 4 transfer.
- the vibration exciters are not shown any further.
- You can driven in the usual way by compressed air or by an electric motor accordingly, and are regulated either pneumatically or electrically. Their arrangement can be such that they are both vertically on the Vibrating table 5 act or that one vertically and the other horizontally acts on the vibrating table 5.
- the characteristic data for the fundamental vibrations and the resulting beats depend on the one hand on the type and design of the vibration system and on the other hand on the shape of the model to be embedded (type and position of the undercuts).
- Typical areas are as follows: Fundamental vibrations vertical basic amplitude 0.3 to 0.6 mm vertical fundamental frequency 25 to 50 Hz horizontal basic amplitude 0.05 to 0.15 mm horizontal fundamental frequency 25 to 50 Hz Resulting beats resulting fundamental frequency 25 to 50 Hz resulting amplitude min 0.10 mm / max 1.00 mm preferably min 0.15 mm / max 0.75 mm Frequency of beats 0.3 to 5.0 Hz preferably 0.5 to 2.0 Hz
- the invention is not based on the use of quartz sand limited, but applicable to any dry, free-flowing molding material.
- This also includes iron granules, which are used in the (a variant of the full mold casting process representative) magnetic molding process can be used.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Devices For Molds (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
Grundschwingungen | |
vertikale Grundamplitude | 0,3 bis 0,6 mm |
vertikale Grundfrequenz | 25 bis 50 Hz |
horizontale Grundamplitude | 0,05 bis 0,15 mm |
horizontale Grundfrequenz | 25 bis 50 Hz |
Resultierende Schwebungen | |
resultierende Grundfrequenz | 25 bis 50 Hz |
resultierende Amplitude | min 0,10 mm / max 1,00 mm |
vorzugsweise | min 0,15 mm / max 0,75 mm |
Frequenz der Schwebungen | 0,3 bis 5,0 Hz |
vorzugsweise | 0,5 bis 2,0 Hz |
Claims (5)
- Verfahren zum Einbetten von Modellen für das Vollformgießverfahren unter Verwendung von rieselfähigem, bindemittelfreiem Formstoff, dadurch gekennzeichnet, daß der Formstoff während seines Einlaufens in den Formbehälter in Schwebungen versetzt wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Schwebungen aus zwei in der Amplitude gleichen oder nahezu gleichen Grundschwingungen erzeugt werden, die eine regelbare, leicht unterschiedliche Grundfrequenz und/oder Grundphase aufweisen.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Grundschwingungen in horizontaler und/oder vertikaler Richtung auf den Formbehälter einwirken.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß mit einer Schwebungsfrequenz von 0,3 bis 5 Hz (vorzugsweise 0,5 bis 2,0 Hz) bei Schwebungsamplituden zwischen minimal 0,10 mm (vorzugsweise 0,15 mm) und maximal 1,00 mm (vorzugsweise 0,75 mm) gearbeitet wird.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Formstoff mit einer in den einzelnen Füllebenen weitgehend konstanten Einlaufgeschwindigkeit in den Formbehälter eingefüllt wird.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4225245A DE4225245A1 (de) | 1992-07-30 | 1992-07-30 | Verfahren zum Einbetten von Modellen für das Vollformverfahren |
DE4225245 | 1992-07-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0581201A1 EP0581201A1 (de) | 1994-02-02 |
EP0581201B1 true EP0581201B1 (de) | 1998-02-04 |
Family
ID=6464490
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93111778A Expired - Lifetime EP0581201B1 (de) | 1992-07-30 | 1993-07-22 | Verfahren zum Einbetten von Modellen für das Vollformgiessverfahren |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0581201B1 (de) |
AT (1) | ATE162967T1 (de) |
DE (2) | DE4225245A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004027638B3 (de) * | 2004-06-05 | 2006-02-09 | Albert Handtmann Metallgusswerk Gmbh & Co. Kg | Verfahren und Vorrichtung zum Transport und zur Verdichtung der Formstoffpartikel bei der Formherstellung mittels Vollformgießverfahrens |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE830424C (de) * | 1949-09-11 | 1952-02-04 | Carl Schenck Maschinenfabrik D | Verfahren und Vorrichtung zum Vibrieren von dreh- oder schwenkbar gelagerten Koerpern, z.B. Formen, Behaeltern, Sieben o. dgl. |
DE1203920B (de) * | 1960-07-06 | 1965-10-28 | Heinrich Nellen | Verfahren zur Herstellung von Giessformen |
-
1992
- 1992-07-30 DE DE4225245A patent/DE4225245A1/de not_active Withdrawn
-
1993
- 1993-07-22 AT AT93111778T patent/ATE162967T1/de not_active IP Right Cessation
- 1993-07-22 DE DE59308089T patent/DE59308089D1/de not_active Expired - Fee Related
- 1993-07-22 EP EP93111778A patent/EP0581201B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE59308089D1 (de) | 1998-03-12 |
EP0581201A1 (de) | 1994-02-02 |
DE4225245A1 (de) | 1994-02-03 |
ATE162967T1 (de) | 1998-02-15 |
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