EP0814924B1 - Sandformqualität durch ölstrommessung zum presshaupt - Google Patents
Sandformqualität durch ölstrommessung zum presshaupt Download PDFInfo
- Publication number
- EP0814924B1 EP0814924B1 EP96907251A EP96907251A EP0814924B1 EP 0814924 B1 EP0814924 B1 EP 0814924B1 EP 96907251 A EP96907251 A EP 96907251A EP 96907251 A EP96907251 A EP 96907251A EP 0814924 B1 EP0814924 B1 EP 0814924B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sand
- hydraulic fluid
- moulding material
- process according
- oil
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
- B22C15/02—Compacting by pressing devices only
- B22C15/08—Compacting by pressing devices only involving pneumatic or hydraulic mechanisms
Definitions
- the invention relates to a method according to claim 1, in particular the control or regulation of a Multi-stamp press head or block press head of a molding machine for clay-bound molding material (e.g. molding sand).
- clay-bound molding material e.g. molding sand
- An electrode 7 is arranged with two poles on a press plate in order to detect the resistance of a finished pressed mold and also to send a corresponding signal to the control device.
- the same control device calculates the water content of the mold half from the thicknesses and the resistance in order to directly check the properties of the molding sand during the manufacture of the upper and lower mold halves (cf. column 2, lines 15 to 25, 48 to 68 and column 1, Lines 27 to 31).
- the aforementioned document relates to pressing with press plates, while the person skilled in the art also has access to a compacting device with multiple punches, cf. JP-A 57-142 743 ( Komatsu) or JP-A 55-16 786 (Sintokogio).
- the latter document relates to the production of sand molds with the same molding material hardness, even when using a complicated model.
- the relief valve drains oil into a tank (there 12) to keep the specified pressure constant.
- the problem of the invention is to adapt the parameters that can be influenced in a molding machine in order to maintain a good long-term shape. Constant height of the bale of form should be made possible as well as uniformity of compaction. The time for compression should be adjusted so that a minimum time per mold is achieved.
- the parameters are to be obtained directly on the molding machine (measured), including a measurement of the volume, the mass or changing their hydraulic fluid to the press head will (claim 1).
- the measurement of the fluid is surprising a good starting point for the controlled or regulated Improvement of the sand shape.
- the variants can be used individually or cumulatively, up to all four "alternatives" at the same time.
- the method used according to the invention simplifies the apparatus expenditure considerably.
- the measuring principle can be used for the detection of volume flows e.g. Hydraulic oil can be used.
- the principle is based on the controlled generation of Coriolis forces. These powers occur in a system whenever there is a translational (rectilinear) and rotatory (rotating) Movement overlap.
- the Temperature of the measuring tubes detected. This signal corresponds to the Product temperature and is also available for external purposes Available.
- volume per unit of time volume per unit of time
- volume flow and “mass per Unit of time” is a matter of application (Coriolis, Volumeter, piston accumulator ). If a low pressure surge, contactless, low-wear measuring principle is used, the best results are obtained.
- the compressibility correction or the corresponding optimization works long-term, by adding or blocking sludge or about the change in moisture content of the molding sand before it is filled into the Molding box (claim 3, claim 4). With every press (Forming) is available via the hydraulic fluid gradient measurement new measured value for the compressibility available, the one desired change of the sand causes. So far from the If this regulation is still desired, it is based on a setpoint-actual value comparison (claim 5, claim 8).
- the electronic device is also disclosed here Regulation and control technology that the specialist for Carrying out the method based on the measurements of the Uses fluid stream or its derivatives.
- Figure 1 shows schematically in the left half press rams which are connected to a common oil well Q and which penetrate into a sand ridge R with different depths (deep, normal, high).
- a model M can be seen on the bottom of the schematically indicated molding box F.
- the stamps in the left image are too deep in the back of the form penetrated, the stamps in the right drawing are too high.
- the Stamps in the middle part of the picture have the normal position on the The upper edge of the molding box lies.
- the one to the right of the three Curves drawn in diagrams show the mean "normal”, the 30 liter oil volume between the retracted position Stamp and end position "normal” in the diagram shows.
- 45 liters Oil represent the deep penetration of the left stamp in the Diagram and 16 liter oil volume represent that too high lying stamp.
- the respective remaining height of the Sand bales can be seen in the lower right part diagram.
- the stamps are 40mm too high for 16 liters of oil; for 30 liters flowed oil is the specified and set setpoint ⁇ reached zero, and when 45 liters of oil flowed, they penetrate Stamp 30mm too deep in the mold box F.
- a model change is the change from one model volume to another.
- the amount of molding material that can be arranged in the molding box changes, ie if the model is changed from a deep model to a high model M, it is no longer possible to fill the box with as much molding material in order to achieve the same final height after compression.
- the movement of the multi-stamps is as a whole about the oil volume measured. This measurement is carried out using a previously described measuring device (Coriolis, Volumeter, Piston measurement). At the end of the press, the actual oil flow registered. If a lot of oil has flowed, the stamps H stand the stamps are deep, little oil has flowed at the end of the press high.
- a box F after a model change is a changed model filled with the appropriate amount of molding material.
- Via a calibration curve (a) in the control the height of the ram at the end of the press from the amount of oil flowed determined.
- the deviation from the level of the ram before Model changes are counteracted by changing the amount of molding material.
- Another calibration curve is used for this.
- the second calibration curve (b) results from the manufacturing operation for the previously used models or is a permanently installed curve (e.g. from a model database).
- the stamps were set too low, the next impression more sand filled.
- the stamps were due high, the next impression will be less sand filled.
- FIG. 2 represents the reproducibility of the stamp position and shows the start of the multi-stamp press head H in the left part.
- an oil quantity q (t) of 30 liters (for example) has flowed, the stamps have moved into their end position after 1 second. If the oil is withdrawn from the plunger, the oil flowing back is compared with the amount of oil that has flowed until the end of the press. A small tolerance range T B is opened to compensate for inaccuracies. If the amount of oil flowing in and the amount of oil flowing back are not the same, an error message is output.
- the stamps are specifically moved back and forth by positive / negative oil pressures.
- Figure 3 represents an energy consumption and time requirement minimization.
- FIG. 1 illustrates schematically the end of the press at about 1 second and shows that the amount of oil flowed there is only small in the same 10 ms interval (T 0 ). The pressing process can already be stopped here.
- the flow of hydraulic oil per unit of time is determined by monitors the measuring system built into the hydraulic circuit.
- the Situation "pressing end” is when the volume per unit time strives towards zero. Via curves stored in the control the course of the press can be detected during the movement of the multi-punch.
- FIG. 4 represents a compressibility correction (VD) and shows two gradients x, y for sand with high compressibility (normal ⁇ , ⁇ y ) and for low compressibility of the sand (large ⁇ , ⁇ x ), where ⁇ x > ⁇ y . Both diagrams therefore show the change in the oil volume per time, with the start of the respective slope characterizing the point in time at which the punches hit the molding sand.
- VD compressibility correction
- the time period T 1 until the multiple stamp encounters resistance is relatively short; with low compressible sand (high bulk density), it is comparatively long.
- the function "volume per unit time” over time in FIG. 4 runs steeply with low compressible sand, with high compressible sand (VD ⁇ ) runs the function "volume flow per Unit of time "comparatively flat.
- the functions of the courses “Volume per unit of time” over time is recorded.
- the triggered control according to this speed function an adjustment of the amount of sand filled in or a readjustment the moisture / compressibility in the sand preparation in long term (multiple blends spacing).
- Too steep drop means "volume per unit of time” for example too low compressibility. There will be more sand filled (short-term), the amount of moisture (compressibility) over the water control in the mixer increased (long-term) by the Increase compressibility. The same applies vice versa to weak waste per time (less water in the mixer).
- the pressurized units in the molding plant are so regulated that oil consumption is always the same as possible becomes.
- the storage volumes decrease.
- the aggregates are smaller.
- the oil consumption is minimized. Tips in consumption are avoided and no longer need to be buffered.
Description
- Figur 1
- repräsentiert ein Ausführungsbeispiel für das Regelverfahren 1, bei dem die Sandmenge nach einem Modellwechsel geändert wird, um gleiche Sandballen-Höhen zu erreichen.
- Figur 2
- repräsentiert ein Ausführungsbeispiel, mit dem ein nach Preßende ausgerissener Stempel anhand einer Ölmengenmessung erkannt werden kann.
- Figur 3
- betrifft ein Beispiel, wie der Zeitbedarf zur Herstellung einer Sandform aufgrund einer Messung des geflossenen Ölvolumens minimiert werden kann, wodurch auch der Energieverbrauch gesenkt wird.
- Figur 4
- repräsentiert ein Ausführungsbeispiel für eine Korrektur der Verdichtbarkeit des Sandes durch Messung von Ölfluß-Änderung pro Zeitintervall.
Preßende="Abschalten des Druckes"
wird das entsprechende Signal aus dem Istwert
Volumen/Zeiteinheit gegenüber einem Sollwert oder dem Wert Null verglichen und der Preßdruck abgeschaltet.
Allgemein gilt: | ||
Schüttgewicht | groß | niedrig |
Verdichtbarkeit VD | klein | groß |
Fließfähigkeit | stark | klein |
mögliche Preßwege | gering | groß |
Einfüllhöhe | tiefliegend | hochliegend |
Claims (10)
- Verfahren zum Beeinflussen der Qualität von Formstoff-Formen aus Formstoff-Verdichtungseinrichtungen mit einer über Hydraulikfluid ansteuerbaren Verdichtungseinheit, wobei(a) das zur Verdichtungseinheit strömende Hydraulikfluidvolumen (q(t)) oder dessen Masse gemessen wird und der Meßwert direkt und/oder als Änderungswert (q'(t),q"(t)) in einer Steuerung oder Regelung eingesetzt wird;(b) das Volumen, die Masse oder deren Änderung gemäß Gruppe (a) eingesetzt werden, um Parameter des Formstoffes oder der Formstoff-Formung, insbesondere des Sandes bzw. der Sandformung, steuernd oder regelnd zu verändern.
- Verfahren nach Anspruch 1, bei dem(a) die Formstoffmenge verändert wird, die in einen Füllrahmen oder Formkasten eingefüllt wird, bevor der Preßvorgang beginnt; oder/und(b) die Verdichtungseinheit abgeschaltet wird oder eine Fehlermeldung abgegeben wird, wenn bei dem Zurückfahren von Stempeln der Verdichtungseinheit auf eine Referenzposition nicht in etwa dasselbe Hydraulikfluidvolumen oder dieselbe Hydraulikfluidmasse von der Messung erfaßt wird, die beim Pressen zu den Stempeln geflossen ist; oder/und(c) der Meß- oder Rechenwert Fluidvolumen pro Zeiteinheit oder Fluidmasse pro Zeiteinheit mit Null oder einem kleinen Referenzwert verglichen wird, um das Ende eines Preßvorgangs zu erfassen; oder/und(d) die Verdichtbarkeit (VD) des zur Verdichtungseinheit geförderten Formstoffes, insbesondere Formsandes, abhängig von dem Gradienten des Hydraulikfluidvolumens oder dessen Masse verändert wird.
- Verfahren nach Anspruch 1 oder 2, bei dem die Änderung der Hydraulikfluidmasse oder des Hydraulikfluidvolumens, insbesondere das Ölvolumen (q(t)) oder seine zumindest erste Ableitung nach der Zeit (dq(t)/dt), zur Veränderung der Verdichtbarkeit des zur Verdichtungseinheit geförderten Formstoffes, insbesondere Formsandes, verwendet wird.
- Verfahren nach Anspruch 3, bei dem die Veränderung als der Stellgrößeneinfluß zur Steuerung des zur Formung geförderten Formstoffes langfristig erfolgt.
- Verfahren nach einem der Ansprüche 2 bis 4, bei dem der Referenzwert so gewählt wird, daß die Formstoff-Form genügend Härte aufweist, bei gleichzeitig kürzestmöglicher Preßwirkung.
- Verfahren nach einem der Ansprüche 2 bis 5, bei dem eine bzw. die Veränderung der Verdichtbarkeit durch Veränderung der Zugabe von Wasser oder/und durch Änderung der Zugabe von Schlämmstoff, Additiven oder einer Zusammensetzung davon erfolgt.
- Verfahren nach einem der vorigen Ansprüche, bei dem die Hydraulikfluidmessung in der Verdichtungseinrichtung, insbesondere der Formmaschine, integriert ist oder ihr zugehörig ist.
- Verfahren nach Anspruch 2, bei dem die Veränderung der Formstoff-Mengenzufuhr nur bei einem vorhergehendem Modellwechsel aktiviert wird.
- Verfahren nach einem der vorigen Ansprüche, bei dem die Verdichtungseinheit Stempel (H) aufweist und Eichkurven (a,b) zur Formstoff-Mengenveränderung herangezogen werden, die die Abhängigkeit der Stempelstellung von dem Hydraulikfluidvolumen (q) und die Abhängigkeit der Formstoffmenge von einem gemessenen Hydraulikfluidvolumen bzw. seiner Ableitung angeben.
- Verfahren nach einem der vorigen Ansprüche, bei dem die Verdichtungseinheit Stempel (H) aufweist und alle Stempel an einer gemeinsamen Quelle des Hydraulikfluides angekoppelt sind und ein Volumen-Pro-Zeit-Meßgeber in der Zuleitung zu den Stempeln (H) angeordnet ist.
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19509211 | 1995-03-17 | ||
DE19509211 | 1995-03-17 | ||
DE19540466 | 1995-10-30 | ||
DE19540466A DE19540466A1 (de) | 1995-03-17 | 1995-10-30 | Sandformqualität durch Ölstrommessung zum Preßhaupt |
PCT/DE1996/000463 WO1996029163A1 (de) | 1995-03-17 | 1996-03-15 | Sandformqualität durch ölstrommessung zum presshaupt |
US08/937,674 US5980794A (en) | 1995-03-17 | 1997-09-25 | Method of controlling compacting by measuring hydraulic fluid |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0814924A1 EP0814924A1 (de) | 1998-01-07 |
EP0814924B1 true EP0814924B1 (de) | 2000-11-08 |
Family
ID=27214942
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96907251A Expired - Lifetime EP0814924B1 (de) | 1995-03-17 | 1996-03-15 | Sandformqualität durch ölstrommessung zum presshaupt |
Country Status (8)
Country | Link |
---|---|
US (1) | US5980794A (de) |
EP (1) | EP0814924B1 (de) |
CN (1) | CN1063113C (de) |
AT (1) | ATE197418T1 (de) |
DE (2) | DE19540466A1 (de) |
DK (1) | DK0814924T3 (de) |
ES (1) | ES2153953T3 (de) |
WO (1) | WO1996029163A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19652308B4 (de) * | 1995-12-15 | 2007-03-01 | Künkel-Wagner Prozesstechnologie GmbH | Dynamische Iterative Stempel-Regelung des Preßvorganges beim Vielstempelpressen |
JP3400356B2 (ja) * | 1998-07-01 | 2003-04-28 | 新東工業株式会社 | 生型造型方法およびそのシステム |
CN1234481C (zh) * | 2000-04-13 | 2006-01-04 | 新东工业株式会社 | 型砂的压缩方法及其装置 |
WO2001081025A1 (fr) * | 2000-04-21 | 2001-11-01 | Sintokogio, Ltd. | Machine a mouler en matrice et support de modele |
TWI448644B (zh) * | 2007-05-07 | 2014-08-11 | Cree Inc | 照明設備 |
CN102615250A (zh) * | 2012-04-25 | 2012-08-01 | 机械工业第三设计研究院 | 活塞环三工位造型机砂型厚度控制方法及系统 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5039294A (en) * | 1988-05-31 | 1991-08-13 | L'oreal | Apparatus for compacting powder |
US5409052A (en) * | 1992-11-27 | 1995-04-25 | Sintokogio, Ltd. | Device for simultaneously forming cope and drag molds |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5953141B2 (ja) * | 1978-07-25 | 1984-12-24 | 新東工業株式会社 | 分割スキ−ズフ−ト方式の鋳型造型方法およびその装置 |
US4376085A (en) * | 1980-06-04 | 1983-03-08 | Cts Corporation | Method for producing uniform density and weight briquettes |
JPS57142743A (en) * | 1981-02-27 | 1982-09-03 | Komatsu Ltd | Squeeze head for multiple molds of molding machine |
DE3740185A1 (de) * | 1987-06-13 | 1989-06-08 | Badische Maschf Gmbh | Verfahren und vorrichtung zum verdichten von formstoff in giesserei-formmaschinen |
CH681786A5 (de) * | 1990-05-16 | 1993-05-28 | Fischer Ag Georg | |
DE4032659A1 (de) * | 1990-10-15 | 1992-04-16 | Kautex Maschinenbau Gmbh | Verfahren und vorrichtung zur herstellung von hohlkoerpern aus thermoplastischen kunststoff |
DE4114362A1 (de) * | 1991-05-02 | 1992-11-05 | Wagner Heinrich Sinto Masch | Verfahren zum herstellen einer sandform |
JP2520832B2 (ja) * | 1992-11-27 | 1996-07-31 | 日精樹脂工業株式会社 | 射出成形機の制御方法 |
DK169236B1 (da) * | 1993-07-20 | 1994-09-19 | Dansk Ind Syndikat | Fremgangsmåde ved fremstilling af støbeforme eller dele af sådanne ved sammenpresning af partikelmateriale samt apparat til udøvelse af fremgangsmåden |
DE4335403C1 (de) * | 1993-10-18 | 1994-12-15 | Karl Hehl | Hydraulikeinrichtung |
-
1995
- 1995-10-30 DE DE19540466A patent/DE19540466A1/de not_active Withdrawn
-
1996
- 1996-03-15 AT AT96907251T patent/ATE197418T1/de not_active IP Right Cessation
- 1996-03-15 EP EP96907251A patent/EP0814924B1/de not_active Expired - Lifetime
- 1996-03-15 DE DE59606130T patent/DE59606130D1/de not_active Expired - Lifetime
- 1996-03-15 DK DK96907251T patent/DK0814924T3/da active
- 1996-03-15 WO PCT/DE1996/000463 patent/WO1996029163A1/de active IP Right Grant
- 1996-03-15 ES ES96907251T patent/ES2153953T3/es not_active Expired - Lifetime
- 1996-03-15 CN CN96192643A patent/CN1063113C/zh not_active Expired - Lifetime
-
1997
- 1997-09-25 US US08/937,674 patent/US5980794A/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5039294A (en) * | 1988-05-31 | 1991-08-13 | L'oreal | Apparatus for compacting powder |
US5409052A (en) * | 1992-11-27 | 1995-04-25 | Sintokogio, Ltd. | Device for simultaneously forming cope and drag molds |
Also Published As
Publication number | Publication date |
---|---|
ATE197418T1 (de) | 2000-11-11 |
CN1179120A (zh) | 1998-04-15 |
DK0814924T3 (da) | 2001-02-12 |
EP0814924A1 (de) | 1998-01-07 |
DE59606130D1 (de) | 2000-12-14 |
WO1996029163A1 (de) | 1996-09-26 |
ES2153953T3 (es) | 2001-03-16 |
DE19540466A1 (de) | 1996-09-19 |
CN1063113C (zh) | 2001-03-14 |
US5980794A (en) | 1999-11-09 |
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