Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22C—FOUNDRY MOULDING
  • B22C23/00—Tools; Devices not mentioned before for moulding
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22C—FOUNDRY MOULDING
  • B22C19/00—Components or accessories for moulding machines
• • 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
  • B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22C—FOUNDRY MOULDING
  • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
  • B22C15/23—Compacting by gas pressure or vacuum
  • B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles

Definitions

• the invention relates to a method for producing molds or cores, in particular for foundry purposes, wherein molding material or sand and at least one binder which is at least predominantly inorganic, water-soluble and / or hygroscopic, are mixed by means of a mixing device and wherein this mixture by means of a feeder at least one sand storage unit is fed to a core or molding machine.
• the invention further relates to an apparatus for producing molds or cores, in particular for foundry purposes, with a mixing device for mixing molding material or sand and a binder which is at least predominantly inorganic, water-soluble and / or hygroscopic, and with a feed device for conveying the mixture to a sand storage unit of a core or molding manufacturing device.
• the method defined at the outset provides that the mixture-free region of the mixing device is at least temporarily and / or the mixture-free region of the feed device located between the mixing device and the core or molding production device and / or the mixture-free region of the sand storage unit behind the feed device and moistened or kept moist before the core or mold making apparatus.
• moistening sets in the areas mentioned a high humidity which can prevent or reduce evaporation or leakage of moisture from the mixture.
• the mixture can neither completely nor partially harden or dry or form encrustations. Soiling of the mixing device and / or the feed device and / or the sand storage unit, but also the core or mold production device, can thus be reduced and / or the necessary extended cleaning intervals. In particular, this can have a positive effect on the productivity of the core and mold manufacturing process and, in addition, the cleaning intervals can be extended and the cleaning costs reduced.
• the mixture-free region of the mixing device is at least temporarily moistened or kept moist, at least during the mixing process. Especially by the mixing process moisture could escape from the mixture in the mixture-free area. By moistening the mixture-free area can be easily prevented that moisture exits the mixture, these dries, adheres to parts of the mixing device and dirty the mixing device.
• evaporation or escape of moisture from the mixture is reduced or prevented by keeping the air humidity above the mixture by supplying moisture, in particular to about 70% to 100%, preferably to about 80%. kept up to 100%.
• Such humidity values minimize the moisture gradient between the mixture and the air surrounding the mixture, thereby largely preventing the release of moisture from the mixture to the air by evaporation and concomitant undesired curing of the mixture.
• the liquid used for wetting or the water used for wetting can be atomized to a suspended aerosol by means of ultrasound and to be supplied to the mixing device and / or the feed device and / or the sand storage unit.
• the suspended aerosol points such small liquid components that they can evaporate directly and increase the humidity without condensing and precipitate without condensate in the mixing device and / or the feeder and / or the sand storage unit.
• the size of the fluid particles produced by ultrasound may be on the order of 0.01 mm or less. At the same time a sufficiently high humidity is achieved, which can prevent the drying of the sand-binder mixture. Both the mixing process as well as the supply and storage of the Sandbinderge- mix can be done reliably.
• the aerosol or the quantity of this aerosol which can be aerated and the size of the volumetric flow provided with the aerosol can be adjusted by changing the pulse packets delivered by the ultrasound transmitter (s) and / or by changing the voltage of the ultrasound transmitter (s).
• the amount of the aerosol which can be aerated, with which the mixing device and / or the sand storage unit is moistened can be adapted to the prevailing conditions such as atmospheric humidity, size of the volume to be humidified and ambient temperature.
• a particularly expedient embodiment of the method according to the invention can be that the suspended aerosol is formed and fed via one or more lines of the mixing device and / or the feed device and / or the sand storage unit.
• the generation of the aerosol thus takes place outside the mixing, feeding and / or the sand Vorratssaku.
• For the production of the aerosol so no additional space is needed in the mixing, feeding and / or the sand storage unit. Nevertheless, it is possible to provide a sufficiently high humidity so that a Drying of the sand-binder mixture can be avoided, but without supplying too much liquid, which in particular the binder could possibly be flushed or dissolved.
• the device defined at the outset is characterized in that a humidifying device acting on the inside or opening into the interior of the mixing device and / or on the supply device and / or on the sand storage unit is provided.
• a humidifying device acting on the inside or opening into the interior of the mixing device and / or on the supply device and / or on the sand storage unit is provided.
• the generation and maintenance of the desired air humidity can be achieved in a particularly simple manner, so that the risk of drying due to moisture loss of the mixture in the mixing device and / or in the feed device and / or in the sand storage unit is reduced can.
• This can favorably reduce the contamination of the mixing device and / or the feed device and / or the sand storage unit, but also of the downstream core or mold production device.
• the moistening device has at least one ultrasound transmitter in the form of an ultrasonic atomizer for water or for a liquid containing in particular water.
• the invention thus makes use of the fact or knowledge that with ultrasonic atomizers water or a liquid containing water can be atomized such that the individual droplets can be less than 20 thousandths of a millimeter or even less than 10 thousandths of a millimeter, so that they are in humidity over - Go and hardly or hardly as moisture film on parts of the mixing device and / or the feeder and / or the sand storage unit reflected.
• the / the ultrasonic atomizer and a corresponding liquid reservoir spatially separated from the mixing device and / or from the feeder and / or from the sand storage unit arranged and with the / to be moistened area (s) via at least one Rohroder hose is connected / are.
• the floating aerosol formed by an ultrasonic atomizer from water or from a liquid containing water can be easily transported over several meters through such a conduit to provide at the desired location sufficiently humid air, drying the mixture of sand or molding material and Binder prevents in particular in the mixing device itself, the feeder and / or the sand storage unit, but without too much wet this mixture.
• the liquid reservoir with the / the ultrasound generator (s) can be arranged in an advantageous manner at a location of the forming or core shooter or near this machine, where sufficient space is available.
• the mixing device, the feed device and the sand storage unit are each connected to the moistening device via a pipe or hose line.
• pipe or hose lines present separately for the individual device areas, moist air can be introduced individually to the individual process steps into the mixing device, the feed device and / or the sand storage unit.
• the number of ultrasonic atomizers at least equal to the number of pipe or hose lines and per Rohroder hose line at least one ultrasonic atomizer is provided.
• at least one ultrasonic atomizer per pipe 5 line it is possible that even with different humidity levels in the areas to be humidified a sufficient amount of liquid can be atomized and fed to the respective areas to prevent drying and crusting of the mixture.
• I 5 is arranged in particular above the liquid surface in the liquid reservoir.
• the aerosol could flow, especially with relatively short lines due to its autogenous pressure to the mixing device and / or feeder and / or sand supply unit, however, a fan or a
• the aerosol can also be conveyed upwards, so that the ultrasonic atomizer can also be arranged deeper with the liquid reservoir, where, as a rule, sufficient space is available for this purpose.
• a modified embodiment of the invention can provide that the feed device is at least one movable transport bucket.
• a movable transport bucket as a feeder, it is possible to transport the sand-binder mixture from the mixing device to the sand storage unit of the core or mold manufacturing device over longer distances.
• FIGURE shows a schematic representation of a longitudinal section of a mixing device, a feeder and a sand storage unit with pending Kern- or Formher einsvorraum and a moistening device with two Ultraschallzerstäubern and liquid reservoir and three supply lines, one to the mixing device, one to the feeder and one to the sand storage unit runs.
• a generally designated 1 apparatus for producing molds or cores in the embodiment for the production of cores for foundry purposes, comprises a mixing device 20 with a mixing tool 22 for producing a mixture M by mixing molding material or sand and a binder, a feeder 30 for Forwarding the mixture M to a sand storage unit 40 with a closure device 42 and a core or molding device 50 on.
• a humidifier 2 For moistening the air in the device 1 is a humidifier 2 with two Ultraschallzerstäubern 60 for Water or for a particular water-containing liquid 71 and a liquid reservoir 70. With the help of these ultrasonic atomizers 60, the liquid 71 can be atomized to a fine aerosol. This aerosol is indicated by the two cloud fungi 61 in the interior of the liquid reservoir 70 in the figure.
• an unillustrated embodiment of the device can also provide that three ultrasonic atomizers 60 are provided, one of which is assigned to one of the three pipelines 81, 82 and 83, so that for the liquid supply to the areas to be humidified per pipeline 81, 82 and 83 at least one ultrasonic atomizer is available.
• the amount of moisture for the individual areas can be individually dimensioned and fed.
• the moistening device 2 with the ultrasonic atomizers 60 and the liquid reservoir 70 is spatially separated from the mixing device 20, the feed device 30 and the sand storage unit 40, but connected to the areas to be moistened via conduits 81, 82 and 83 are, which extend directly from the liquid reservoir 70 in said areas of the device 1 and there supply mixture-free areas 21, 31 and 41 with moist air.
• the mixing device 20 not only the mixing device 20, but also the feed unit 30 and the sand storage unit 40 at least temporarily each have a mixture-free region 31 and 41.
• a fan 90 and a compressed gas connection 10 can be seen in the liquid-free region of the liquid reservoir 70.
• a modified, not shown embodiment of the device 1 can provide that the feed device 30 is at least one transport bucket which can be moved, for example, by means of a railroad track or crane between the mixing device 20 and the sand storage unit 40.
• the mixture M is mixed by means of a mixing device 20 and fed by means of a feeder 30 at least one sand storage unit 40 of a core or molding device 50, the mixture-free region 21 30 of the mixing device 20 at least temporarily and / or the feed device 30 located between the mixing device 20 and the core or mold production device 50 and / or the sand storage unit 40 behind the feed device 30 and before the core or molding device 50 by means of a liquid 71 moistened or kept moist, wherein the liquid to be wetted 71 atomized by at least one ultrasonic atomizer 60 to a hoverable aerosol and the mixing device 20 and / or the feeder 30 and / or the Sand stock unit 40 via pipes 81, 82 and 83 is supplied.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Molds, Cores, And Manufacturing Methods Thereof (AREA)
• Mold Materials And Core Materials (AREA)
• Casting Devices For Molds (AREA)
• Nozzles (AREA)
• Jigging Conveyors (AREA)

Priority Applications (12)

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Publications (1)

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Citations (2)

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• 2010
  • 2010-04-29 DE DE102010018751.8A patent/DE102010018751B4/de active Active
• 2011
  • 2011-04-08 US US13/695,446 patent/US20130042989A1/en not_active Abandoned
  • 2011-04-08 AU AU2011247371A patent/AU2011247371B2/en not_active Ceased
  • 2011-04-08 BR BR112012027621A patent/BR112012027621A2/pt not_active IP Right Cessation
  • 2011-04-08 DE DE202011110835.3U patent/DE202011110835U1/de not_active Expired - Lifetime
  • 2011-04-08 PL PL16184969T patent/PL3117928T3/pl unknown
  • 2011-04-08 JP JP2013506521A patent/JP5744183B2/ja active Active
  • 2011-04-08 MX MX2012012332A patent/MX2012012332A/es active IP Right Grant
  • 2011-04-08 WO PCT/EP2011/001757 patent/WO2011134598A1/de active Application Filing
  • 2011-04-08 RU RU2012146853/02A patent/RU2557382C2/ru not_active IP Right Cessation
  • 2011-04-08 EP EP11713707.5A patent/EP2563537B2/de active Active
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  • 2011-04-08 ES ES16184969T patent/ES2713461T3/es active Active
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