EP4032635A1 - Dispositif d'alimentation d'un outil de formation de noyau par un gaz durcisseur - Google Patents

Dispositif d'alimentation d'un outil de formation de noyau par un gaz durcisseur Download PDF

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Publication number
EP4032635A1
EP4032635A1 EP21401003.5A EP21401003A EP4032635A1 EP 4032635 A1 EP4032635 A1 EP 4032635A1 EP 21401003 A EP21401003 A EP 21401003A EP 4032635 A1 EP4032635 A1 EP 4032635A1
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EP
European Patent Office
Prior art keywords
carrier gas
flow channel
heating device
energy storage
storage elements
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Withdrawn
Application number
EP21401003.5A
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German (de)
English (en)
Inventor
Helge HÄNSEL
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.)
Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP21401003.5A priority Critical patent/EP4032635A1/fr
Publication of EP4032635A1 publication Critical patent/EP4032635A1/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/162—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents use of a gaseous treating agent for hardening the binder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/12—Treating moulds or cores, e.g. drying, hardening
    • B22C9/123—Gas-hardening

Definitions

  • the invention relates to a device for supplying a core mold tool for producing a sand core for castings with a gaseous curing medium for the sand core, the curing medium consisting of a carrier gas or a mixture of carrier gas and a catalyst element, with a preheating device, a heating device for the carrier gas and a Dosing unit for the catalyst element.
  • Sand cores are manufactured in metal foundries and used in casting molds in order to be able to form cavities in the castings in question.
  • the sand cores usually consist of a basic mold material such as sand, to which a binding agent is added in order to give the cores suitable dimensional stability and strength after a hardening process. The strength must be such that the cores are dimensionally stable during the casting process, but can then be easily removed from the cast part.
  • organic binders and inorganic binders are known.
  • the sand cores are manufactured industrially using production units such as core shooters.
  • the gas-hardening process consists of a heated carrier gas, for example compressed air, and a catalyst element that is fed in to accelerate the reaction rate of the binder.
  • the carrier gas for example compressed air
  • the catalyst element becomes gaseous under the influence of the heated carrier gas and thus forms a gaseous curing medium which is passed through the permeable sand core.
  • the application of temperature to the carrier gas and the supply of the catalyst element to the carrier gas are carried out outside the production unit, for example a core shooter, in a suitable technical unit.
  • the hardening medium prepared in this way is then fed to the sand core, for example via a compressed air line within the production unit.
  • a gassing hood or gassing plate which is part of the production unit, is placed pressure-tight on the core mold tool, and the hardening medium is transferred under pressure into the bullet holes of the core molding box via connection bores located on the underside of the gassing hood or gassing plate, and fed to and passed through the sand core.
  • the carrier gas used is heated to a temperature in the range of up to 130° C. by a heating device of the external technical unit already mentioned. It is easy to understand that this requires a not inconsiderable amount of energy, which has a significant impact on the cost of producing the cast part.
  • the heated carrier gas also has the task of converting the catalyst element used from the liquid to the gaseous state of aggregation in order to bring about the catalytically accelerated curing of the binder. In practice, this can lead to condensation phenomena on the catalytic converter element, so that an excess is also used for the catalytic converter element. It should also be noted that great care must be taken when using the catalyst element and the carrier gas, in particular due to the temperature impact, since the catalyst element and the carrier gas can form an explosive mixture under certain circumstances. In this context, the respective safety-related explosion limits must be observed.
  • gassing hoods and gassing plates are used to supply the gaseous curing medium to the molding material in the core mold.
  • design features of the known gassing hoods and gassing plates are of manageable complexity.
  • the object of the present invention is therefore to further develop a device with the features described in the generic term of claim 1, in which the energy expenditure required for the hardening process of a sand core and the use of catalyst can be reduced and in which the repair and maintenance costs of conventional devices known from the prior art are optimized and that safe handling of the catalyst element and the carrier gas is ensured.
  • the heating device and the preheating device must be arranged directly adjacent to one another, since the waste heat from the heating device is to be absorbed by the preheating device.
  • the waste heat caused by the heated curing medium in the mold material which is used to store the mold material inside the shooting head of the core shooter, will cause a hardening reaction in the area of the shot openings. It is then no longer possible to fill the core tool with molding material.
  • the inventive idea also lies in the fact that, in addition to the energy savings and savings in the catalyst element through the structure and in particular the arrangement of the individual modules, the heating device and preheating device in modular design inside, for example, by substituting the conventional gassing hood or gassing plate with the device described here and outside of the core shooter and then to connect these units to the dosing unit inside the core shooter. This prevents the openings in the shooting head from hardening.
  • the modular design of the device according to the invention enables, on the one hand, simpler and faster replacement of components in the event of malfunctions compared to conventional gassing hoods and gassing plates.
  • a splitting of the functional units used into individual components allows a quick adaptation to changed framework conditions for the use of the curing media used.
  • the division into individual units naturally also increases the flexibility of the overall device with regard to the use of the available space inside and outside the core shooter.
  • this heat transfer to the preheating device can help ensure that the heating device, which is primarily used to heat the carrier gas, no longer emits its heat radiation energy to the extent that is usually known from the prior art in the direction of the shooting head positioned close to the heating device.
  • a shooting head is used within the core shooter to store the molding material for the sand core and to transfer the molding material into the cavity of the core tool through fluidization with the help of compressed air via corresponding injection openings.
  • At least one flow-promoting carrier gas channel in the heating device, it being possible for the walls of the carrier gas channel to be of corrugated design. This measure considerably improves the transfer of heat between the heating element located in the carrier gas channel and its surface and the carrier gas passing through.
  • the metering device has a flow channel which has a connection opening pointing to the heating device and an outlet opening pointing to the core molding tool, with a streamlined flow channel narrowing being present between the connecting opening and the outlet opening of the metering device and a metering channel for the catalyst element opening in the region of this flow channel narrowing.
  • This structural design increases the flow speed in the flow channel of the metering device in this area, so that the carrier gas can be mixed more effectively with the catalyst element introduced into the metering unit through the metering channel.
  • the catalyst element is metered using a metering unit, for example in the form of a double-piston pump. This is intended to ensure a defined, reproducible quantity of the catalyst element in the carrier gas.
  • an additional unit for example in the form of a flow measuring unit, can monitor the dosing process and thus ensure a concentration of the catalyst element in the carrier gas in the range of the respective explosion limits.
  • Another feature of the present invention is the separation of the heating device and the dosing device in a modular design. This is to ensure that the carrier gas/catalyst mixture cannot ignite, for example due to the hot surface of a built-in heating element.
  • the dosing of the catalyst element and the heating of the carrier gas are decoupled from each other.
  • a negative pressure is established in the dosing channel, which supports the complete supply of the dosed catalyst element.
  • the energy storage elements can have different aerodynamic shape, for example a spherical or elliptical outer shape.
  • Preferred materials for the energy storage elements are highly conductive materials such as Fe, Cu or Al.
  • the energy storage elements can be solid or have a hollow space in their interior that is filled with an energy carrier medium.
  • the use of the energy storage elements serves to generate a diffuse flow within the flow channel, which supports effective mixing of the carrier gas with the catalyst element.
  • the energy storage elements have the property of storing thermal energy. This property serves to support the change of the aggregate state of the catalyst element used from the liquid state to the gaseous phase.
  • the packing density of the energy storage elements is designed in such a way that there is always sufficient permeability of the bed for the gas mixture flowing through.
  • the application of the device according to the invention with the features described above can be designed for both organically and inorganically bound binders, provided that it can take place by means of gas curing.
  • organically or inorganically used binders there is a significant difference in the different temperature levels of the curing medium.
  • a so-called cold box process is primarily used, in which the hardening is essentially effected by the catalyst element and the temperature level is in the range of preferably up to 130°C.
  • a carrier gas such as compressed air, is used for curing.
  • the preferred temperature level for this application is 180°C.
  • the one in the figure 1 Schematically shown device according to the invention has several blocks designed as individual modules in which the gaseous hardening medium necessary for the supply of a core mold for the production of a sand core for castings is prepared for the sand core for its function.
  • the curing medium consists of a mixture of carrier gas and a catalyst element.
  • the carrier gas is through a in the figure 1 not shown carrier gas source provided.
  • the source of the carrier gas can be, for example, a carrier gas system that is available in many industrial companies and has a plurality of tapping points distributed throughout the company, to which carrier gas tools can also be connected if necessary.
  • Such a carrier gas source usually provides carrier gas at a pressure of up to 6 bar at an ambient temperature of 20 degrees.
  • the temperature of the carrier gas provided is not sufficient for the specific application in the device for supplying a core molding tool, since carrier gas temperatures of, for example, up to 130° C. in the organic area and up to 180 degrees in the area of inorganic binders are necessary.
  • the carrier gas is according to figure 1 from the carrier gas source via an appropriate pipeline or hose to the inlet connector 1, which is part of a preheating device 2 for the carrier gas.
  • a carrier gas channel is incorporated in the preheating device 2 , through which the carrier gas is guided from the inlet connection 1 to the connecting pipe 3 .
  • the carrier gas absorbs thermal energy of the preheater housing.
  • the connecting pipe 3 leads the carrier gas from the preheating device 2 to a heating device 4 in which the preheated carrier gas is heated to the temperature of up to 180 degrees required for its function as a curing medium.
  • the heating is preferably carried out electrically by appropriate heating rods in the figure 1 are not shown in detail.
  • the dosing unit 5 has a flow channel 7 which has a connection opening 8 pointing to the heating device 4 and one from the figure 3 visible outlet opening 9 shows as a transition to a core mold.
  • the preheating device 2 belonging to the device dissipates part of the thermal energy that is used to heat the carrier gas in the heating device and thus makes it possible to preheat the carrier gas, as described above.
  • this measure significantly reduces the overall use of thermal energy required to produce the required carrier gas temperature.
  • the carrier gas channel 10 is fluidically optimized in a serpentine form. How from the figure 2 As can be seen, the walls of the carrier gas channel 10 have a wavy shape.
  • the carrier gas flowing through the carrier gas channel 10 is guided by heating rods, not shown in detail, from the inlet opening 11 as a connection to the connecting tube 3 to the outlet opening 12 as a connection to the connection opening 8 of the flow channel 7 of the dosing unit 5 .
  • the flow channel 7 serves to mix the carrier gas with the catalyst element.
  • the catalyst element is approximately centrally in the flow channel 7 through a connection opening 13, which is part of the metering channel 6 is introduced.
  • the catalyst element is dosed by using a dosing unit which is connected to the dosing channel 6 .
  • the flow channel 7 is narrowed in the area of the connection opening 13, it being possible for the cross section of the flow channel 7 to be designed to be streamlined.
  • This special configuration has the advantage that the flow rate of the carrier gas in the flow channel 7 in the area of the flow channel constriction 14 is increased, so that the carrier gas is more effectively mixed with the catalyst element introduced through the connection opening 13 of the metering channel 6 .
  • FIG 4 is the flow channel 7 in analogy to figure 3 shown, a plurality of energy storage elements 15 being introduced into the flow channel 7 in the area before and after the flow channel constriction 14 .
  • the energy storage elements 15 can, as in figure 4 shown have different shapes, for example spherical and or in elliptical design.
  • the use of the energy storage elements 15 also has the effect that a diffuse flow results within the carrier gas channel.
  • Preferred materials for the energy storage elements 15 are highly conductive materials such as iron, copper or aluminum.
  • the energy storage elements 15 can be solid or have an energy carrier medium inside them within a cavity.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
EP21401003.5A 2021-01-22 2021-01-22 Dispositif d'alimentation d'un outil de formation de noyau par un gaz durcisseur Withdrawn EP4032635A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21401003.5A EP4032635A1 (fr) 2021-01-22 2021-01-22 Dispositif d'alimentation d'un outil de formation de noyau par un gaz durcisseur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21401003.5A EP4032635A1 (fr) 2021-01-22 2021-01-22 Dispositif d'alimentation d'un outil de formation de noyau par un gaz durcisseur

Publications (1)

Publication Number Publication Date
EP4032635A1 true EP4032635A1 (fr) 2022-07-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP21401003.5A Withdrawn EP4032635A1 (fr) 2021-01-22 2021-01-22 Dispositif d'alimentation d'un outil de formation de noyau par un gaz durcisseur

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EP (1) EP4032635A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011050264A1 (de) * 2011-05-11 2012-11-15 Stephanus Bigos Vorrichtung zum Begasen von Gusskernen
DE102018120993A1 (de) * 2018-08-28 2020-03-05 Fritz Winter Eisengiesserei Gmbh & Co. Kg Verfahren zur Begasung von für die Herstellung von Gießkernen in einen Kernkasten eingeschossenem Formstoff mit einem Katalysatorgas
KR102150851B1 (ko) * 2020-05-21 2020-09-02 태원금속 주식회사 아민 가스 공급 장치
DE112018002628T5 (de) * 2018-10-16 2020-10-29 Suzhou Mingzhi Technology Co., Ltd. Blashaube, Kernfertigungsvorrichtung und Blasverfahren

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011050264A1 (de) * 2011-05-11 2012-11-15 Stephanus Bigos Vorrichtung zum Begasen von Gusskernen
DE102018120993A1 (de) * 2018-08-28 2020-03-05 Fritz Winter Eisengiesserei Gmbh & Co. Kg Verfahren zur Begasung von für die Herstellung von Gießkernen in einen Kernkasten eingeschossenem Formstoff mit einem Katalysatorgas
DE112018002628T5 (de) * 2018-10-16 2020-10-29 Suzhou Mingzhi Technology Co., Ltd. Blashaube, Kernfertigungsvorrichtung und Blasverfahren
KR102150851B1 (ko) * 2020-05-21 2020-09-02 태원금속 주식회사 아민 가스 공급 장치

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