EP0015530B1 - Verfahren und Vorrichtung zur automatischen Wasserdosierung zum Betreiben einer Giessereikühltrommel für das gleichzeitige Kühlen von Form- und Kernsand und Guss - Google Patents

Verfahren und Vorrichtung zur automatischen Wasserdosierung zum Betreiben einer Giessereikühltrommel für das gleichzeitige Kühlen von Form- und Kernsand und Guss Download PDF

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Publication number
EP0015530B1
EP0015530B1 EP80101056A EP80101056A EP0015530B1 EP 0015530 B1 EP0015530 B1 EP 0015530B1 EP 80101056 A EP80101056 A EP 80101056A EP 80101056 A EP80101056 A EP 80101056A EP 0015530 B1 EP0015530 B1 EP 0015530B1
Authority
EP
European Patent Office
Prior art keywords
water
cooling drum
sand
cooling
temperature
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
Application number
EP80101056A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0015530A1 (de
Inventor
Hans Schetter
Rudi Münkel
Günter Hertlein
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carl Schenck AG
Original Assignee
Dossmann Eisengiesserei und Maschinenfabrik GmbH
Dossmann Eisengiesserei und Maschinenfabrik GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dossmann Eisengiesserei und Maschinenfabrik GmbH, Dossmann Eisengiesserei und Maschinenfabrik GmbH filed Critical Dossmann Eisengiesserei und Maschinenfabrik GmbH
Priority to AT80101056T priority Critical patent/ATE1570T1/de
Publication of EP0015530A1 publication Critical patent/EP0015530A1/de
Application granted granted Critical
Publication of EP0015530B1 publication Critical patent/EP0015530B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying
    • B22C5/085—Cooling or drying the sand together with the castings

Definitions

  • the invention relates to the fully automatic operation of a foundry cooling drum for the simultaneous cooling of mold and core sand and casting emptied from the mold, and to the automatic metering of the amount of water required for optimal cooling conditions.
  • Such cooling drums are e.g. known from DE-A-2431 509 and DE-A-2822333.
  • the cooling drums are important facilities. On the one hand, they allow a faster and automated operating process. On the other hand, a more uniform and stress-avoiding cooling is achieved in the demolded casting that is circulated together with the sand, and the molding sand is available for reuse more quickly. In addition to these production advantages, these cooling drums are becoming increasingly important because less noise, less heat radiation and less dust are produced compared to previous working methods, and more environmentally friendly and humane conditions are created at the workplace.
  • These cooling drums are rotated around the horizontal or slightly inclined drum axis, whereby the material to be cooled moves from the inlet to the outlet.
  • the cooling takes place by means of water evaporation and there is the problem at all times of supplying the amount of water with which the given conditions, which are subject to constant changes both at the inlet and during the passage, are currently taken into account: these conditions, especially the introduced one Amount of heat change, for example in that different casting temperatures are used, in that the time intervals between casting and entry into the cooling drum and thus in the inlet temperatures change, or in that there is a changing volume ratio of casting to sand.
  • the passage of the casting through the cooling drum over time can also be subject to changes depending on the weight and shape of the casting.
  • the amount of water should be measured so that the sand does not clump and remains free-flowing at every point of the drum, on the one hand so that it causes good water evaporation due to the large surface area, and on the other hand due to good and versatile contact with the metal surfaces .
  • the sand must not become too dry either, since otherwise the heat dissipation will decrease, losses of bentonite and coal dust, which are not negligible due to the development of dust, and the exhaust air cleaning system will be heavily polluted.
  • the sand should also be conditioned to a certain extent for reuse. For a good operation, it was found that the sand at the outlet of the drum should have a temperature below 50 ° C and a water content of 1 to 2% and the casting should have a temperature of 60 to 100 ° C.
  • None of the known methods permits a metering of the water addition which responds directly to the current temperature, and much less a correction of the water addition in accordance with the temperature change over the course of the passage of the material to be cooled in the drum.
  • the invention relates to a method and an apparatus for solving this problem.
  • the method for automatic water metering for operating a foundry cooling drum for the simultaneous cooling of molding sand and core sand and cast iron is characterized in that in the interior of the cooling drum, the temperature emanating from the material to be cooled, which is to be cooled, is contactless and continuously at short intervals by means of at least one infrared camera it is measured that electrical signals corresponding to the measured temperatures are formed in a transmitter, that a control signal is formed from each of these signals or from the mean of several signals in a control device, which then controls the positioner of a motorized, pneumatic or hydraulic valve for the Water supply controls.
  • the time intervals between two measurements can be approximately 0.1 to 10 seconds.
  • Usable mean values are already obtained from two measurements. For the calculation of mean values, successive measured values of an infrared camera or the measured values of several infrared cameras can be used.
  • each measuring range serves a complete and independently working dosing system.
  • the cooling drum 1 has an inlet 2 for the goods to be cooled and an outlet 3 where the cooled castings are removed.
  • the cooled sand trickles through perforations at the outlet end of the cooling drum 1 on a conveyor belt.
  • the infrared camera 4a is installed for the first measuring range, seen from the inlet.
  • the optics of this infrared camera 4a (as well as any other infrared camera 4), as can be seen in FIG. 2, is preferably directed to a central location or a location of approximately the greatest thickness of the refrigerated goods 11, as is the result of the , the rotation of the cooling drum indicated by the arrow (see FIG. 2).
  • the measuring object distance depends on the optics used.
  • the first measuring and water metering area should be where the water brought along by the sand has largely evaporated and the lumps of sand coming out of the mold have disintegrated.
  • the electrical line 15a leads from the infrared camera 4a or its built-in transmitter to the control device 5a.
  • a control signal is formed and given to the positioner 6a of the motorized, hydraulically or pneumatically operated metering valve 7a in the water supply line 8a. Pneumatic positioners are preferably used.
  • the individual measured value signals or an average of several successive measured value signals can be used to form the control signal.
  • a plurality of infrared cameras can be used for each measuring and metering area, from whose measured value signals an average is formed.
  • the water supply line 8a is led into the interior of the cooling drum 1, where it is opti through one or more outlet pipes, spray or spray nozzles 9a for the desired cooling and cohesion effect delivers the amount of water.
  • the outlet pipes, spray or spray nozzles 9 are directed upward so that their mouths are above the water supply line 8a.
  • shut-off valve 10a In the direction of flow before the metering valve 7a there is the shut-off valve 10a, with which the water supply is interrupted immediately when the cooling drum is at a standstill. It is advantageous to use an electromagnetically operated shut-off valve which is controlled by the control current of the cooling drum drive.
  • the zero position of the metering valve 7a can be regulated.
  • the device works fully automatically in such a way that the current temperature acts immediately and therefore very quickly and reliably on the water supply or its metering, and that only so much water is added per measuring and metering area that the sand remains capable of traveling, but not too dry becomes.
  • a second measuring range with an independently operating metering system is also provided.
  • This is constructed in the same way as the system described above and includes the infrared camera 4b, the electrical line 15b, the control device 5b, the positioner 6b, the metering valve 7b, the water supply line 8b, the outlet pipes, spray or spray nozzles 9b and that Shut-off valve 10b.
  • the distance between the two measuring and dosing areas is dimensioned such that after the water added in the first area has largely evaporated, further water is added in the second area depending on the temperature measured there.
  • the drum length and diameter as well as the speed of rotation also play a role.
  • the arrangement of two and possibly even more ranges means that the temperature conditions in the interior of the cooling drum, or the ones introduced, are constantly and often irregularly changing both at the entrance and during the passage Amount of heat better recorded, so that the amount of water required just there is supplied to the cooling drum at every point and optimum cooling is achieved.
  • multiple equipment e.g. Length, diameter, operating speed and other design and operating features of the cooling drum as well as the type of casting program are decisive.
  • infrared cameras which in addition to the normal cooling jacket are provided with a further jacket through which compressed air is passed so that it exits around the camera lens and has a flow direction such that dust, vapors and gases are not used Lens can reach.
  • 3 shows the diagram of such a camera.
  • the infrared camera 4 is surrounded by a protective housing 12 so that a space is formed around the outer walls of the camera. Compressed air is introduced through the inlet connection 13 and flows around the camera, as indicated by the arrows, and flows out around the optics and then flows out through the protective tube 16 extending beyond the optics. 14 with the connecting cable and 17 with the pipeline for the flow medium of the normal cooling system.
  • the protective housing 12 is also used for thermal insulation and protection against mechanical damage.
  • the invention offers the advantage that for every casting program, every ratio of sand to metal and every casting size, the optimal amount of water is supplied fully automatically, this automatic also being fully effective in all irregularities that are unavoidable in the foundry operation and when the casting program is changed and the water supply is achieved in a matter of seconds adapts to the current situation.
  • the device is structurally simple and adaptable, on the one hand to all cooling drum constructions, on the other hand to all operating characteristics.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Casting Devices For Molds (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Sampling And Sample Adjustment (AREA)
EP80101056A 1979-03-07 1980-03-03 Verfahren und Vorrichtung zur automatischen Wasserdosierung zum Betreiben einer Giessereikühltrommel für das gleichzeitige Kühlen von Form- und Kernsand und Guss Expired EP0015530B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80101056T ATE1570T1 (de) 1979-03-07 1980-03-03 Verfahren und vorrichtung zur automatischen wasserdosierung zum betreiben einer giessereikuehltrommel fuer das gleichzeitige kuehlen von form- und kernsand und guss.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2908861 1979-03-07
DE2908861A DE2908861C3 (de) 1979-03-07 1979-03-07 Verfahren und Vorrichtung zur automatischen Wasserdosierung beim Betreiben einer Gießereikühltrommel für das gleichzeitige Kühlen von Form- und Kernsand und Guß

Publications (2)

Publication Number Publication Date
EP0015530A1 EP0015530A1 (de) 1980-09-17
EP0015530B1 true EP0015530B1 (de) 1982-09-22

Family

ID=6064696

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80101056A Expired EP0015530B1 (de) 1979-03-07 1980-03-03 Verfahren und Vorrichtung zur automatischen Wasserdosierung zum Betreiben einer Giessereikühltrommel für das gleichzeitige Kühlen von Form- und Kernsand und Guss

Country Status (4)

Country Link
EP (1) EP0015530B1 (da)
AT (1) ATE1570T1 (da)
DE (1) DE2908861C3 (da)
DK (1) DK160679C (da)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06126383A (ja) * 1992-10-23 1994-05-10 Sintokogio Ltd 金型鋳造設備における金型温度の制御方法およびその装置
US5505247A (en) * 1993-05-21 1996-04-09 General Kinematics Corporation Casting process and system

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT227978B (de) * 1957-07-11 1963-06-25 Dietert Co Harry W Einrichtung zum Regulieren des Feuchtigkeitsgehaltes von körnigem Schüttgut
DE1808998C3 (de) * 1968-11-15 1972-01-20 Kurt Ahrenberg Verfahren und Vorrichtung zur automatischen Befeuchtung von Mischguetern
US3599649A (en) * 1969-04-10 1971-08-17 Nat Eng Co Apparatus for cooling granular material
NL7309900A (nl) * 1973-07-16 1975-01-20 Expert Nv Koelerdroger van gietstukken en vormzand.
DE2607265C3 (de) * 1976-02-23 1979-04-19 Mec-Fond S.P.A., S. Prospero, Modena (Italien) Vorrichtung zum Kühlen von Gußteilen und Formsand
DE2651154B1 (de) * 1976-11-09 1977-12-29 Fischer Ag Georg Einrichtung zur temperaturkompensation bei der regelung der formbarkeit von koernigem material
DE2702301A1 (de) * 1977-01-21 1978-07-27 Polysius Ag Verfahren und einrichtung zur bestimmung der temperaturverhaeltnisse bei einem drehrohrofen
GB1603082A (en) * 1977-05-27 1981-11-18 Wallwork & Co Ltd Henry Casting installations

Also Published As

Publication number Publication date
DE2908861A1 (de) 1980-09-18
DE2908861C3 (de) 1981-12-17
EP0015530A1 (de) 1980-09-17
DE2908861B2 (de) 1981-04-16
DK97480A (da) 1980-09-08
DK160679B (da) 1991-04-08
ATE1570T1 (de) 1982-10-15
DK160679C (da) 1991-09-23

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