WO2020177832A1 - Dispositif et procédé pour produire des noyaux à partir d'une matière de moulage - Google Patents

Dispositif et procédé pour produire des noyaux à partir d'une matière de moulage Download PDF

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Publication number
WO2020177832A1
WO2020177832A1 PCT/EP2019/000117 EP2019000117W WO2020177832A1 WO 2020177832 A1 WO2020177832 A1 WO 2020177832A1 EP 2019000117 W EP2019000117 W EP 2019000117W WO 2020177832 A1 WO2020177832 A1 WO 2020177832A1
Authority
WO
WIPO (PCT)
Prior art keywords
working channel
mold cavity
ventilation
area
core box
Prior art date
Application number
PCT/EP2019/000117
Other languages
German (de)
English (en)
Inventor
Reiner Brühl
Original Assignee
Kramer+Grebe Gmbh & Co. Kg Modellbau
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 Kramer+Grebe Gmbh & Co. Kg Modellbau filed Critical Kramer+Grebe Gmbh & Co. Kg Modellbau
Publication of WO2020177832A1 publication Critical patent/WO2020177832A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/06—Core boxes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C13/00—Moulding machines for making moulds or cores of particular shapes
    • B22C13/12—Moulding machines for making moulds or cores of particular shapes for cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C17/00—Moulding machines characterised by the mechanism for separating the pattern from the mould or for turning over the flask or the pattern plate
    • B22C17/02—Moulding machines with pin lifting arrangement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/06—Core boxes
    • B22C7/065—Venting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/06—Core boxes
    • B22C7/067—Ejector elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores

Definitions

  • the invention relates to a device and a method for producing cores from molding material, each having the features of the independent claims.
  • An object made of a molding material for forming internal contours or undercuts of external contours of a cast part is referred to as a core.
  • a core An inner core in the form of a cavity is placed inside the casting mold at the point at which a cavity is to be created in the casting.
  • molding material All materials for the manufacture of cores are referred to as molding material, their structure and composition being determined by the requirements to which this material is subject in the process of core manufacture and the manufacture of the cast part.
  • the molding material can consist of or comprise a natural material, in particular quartz sand, but also, for example, of salt, chrome ore or other mineral substances. Furthermore, the molding material can be semi-synthetic or fully synthetic.
  • Cores can be produced reproducibly using a molding tool, a so-called core box.
  • a core box consists of at least two parts with a mold cavity with the contour of the core to be produced, which can be positioned against each other for closing or opening.
  • Devices of the generic type for producing cores from molding material comprise a core box with the mold cavity, which can be charged with molding material and / or a fluid by means of a filling device. When the mold cavity is open, the core produced is demolded by means of a demolding device and removed from the mold cavity.
  • the molding sand is filled into the mold cavity of a core box and compacted with, as a rule, very high air or gas pressure.
  • a binding fluid is added to the molding material.
  • Slot nozzles are at suitable positions for the removal of fluids during the filling and compression process and any gases that may arise during the hardening of the binding fluid, as well as flushing air
  • the mold cavity when the mold cavity is filled, the mold cavity is vented through vent openings with stationary vent cross-sections or vent volume flows that are optimized for the filling process.
  • the device according to the invention for producing cores from molding material comprises a core box, with a mold cavity arranged inside the core box, a venting device for venting the mold cavity to which a working channel is connected, and a control element movable in the working channel, the working channel at least a section a ventilation path forms.
  • the invention is based on the knowledge that the movable control element in the working channel covers a cross-section that is not available for venting and that the effective venting cross-section can also be varied and set with a change in the position of the control element in the working channel.
  • a guide surface for the control element is advantageously retained in the area of the ventilation aperture, so that guidance in the working channel is ensured. Because the ventilation aperture extends in the circumferential surface by less than 180 ° around the longitudinal axis, the control element in the working channel can be guided past the ventilation aperture without tilting.
  • the guide surface can be smooth or have a structured surface, for example knobs.
  • the guide surface can be continuous in the entire working channel in the longitudinal direction, i. be uninterrupted in the axial direction.
  • the guide surface is designed as segments in the axial direction, i.e. can be interrupted in the axial direction.
  • the venting device can be part of a demolding device for demolding the cores produced from the mold cavity.
  • a space-saving ventilation device can advantageously be created.
  • the demolding device has at least one demolding element which is designed to be movable in the working channel.
  • the ejector pin can advantageously have a rod-shaped section with an end region oriented towards the mold cavity, the working channel can have a second region arranged upstream of the first region, the ejector pin axially in the working channel can be moved between a first position in which the end area lies in the second area and a second position in which the end area lies in the first area and a connection to an outlet of the ventilation path is established in the first area.
  • Vent apertures can be arranged equidistant from one another in the circumferential surface.
  • Control element can be guided symmetrically.
  • three ventilation apertures can be arranged equidistantly in the circumferential surface.
  • the cloverleaf-like arrangement provides a particularly favorable, effective ventilation cross-section.
  • the device for producing cores according to the firing principle is equipped with a firing head or a fluidization head, whereby the two most important structural designs of such devices are expediently covered by the invention.
  • the core box has at least one further venting hole for fluids leading from the mold cavity to an outside of the core box, whereby an additional stationary, non-temporally dynamic venting is implemented, which is particularly important when converting existing systems, which already have such air openings, means a simplification.
  • the core box is designed in at least three parts, with at least two parts being positionable against each other to open and / or close the mold cavity, which expediently enables greater flexibility of the device and is particularly advantageous when retrofitting of existing systems.
  • the method according to the invention for producing cores from molding material has the advantages corresponding to the device according to the invention.
  • the core box 10 is designed in two parts with a first part 10a and a second part 10b.
  • a separating region 10c is arranged between the first part 10a and the second part 10b.
  • the working channel 60 and the working channel 60 ' fluidly connect the mold cavity 100 to an outer side 10d of the second part 10b of the core box 10 and each form a venting path of the mold cavity 100.
  • the venting path can have one or more further subsections in addition to the working duct 60, 60' include. It goes without saying that the ventilation path can also be arranged transversely to the working channel 60, 60 '.
  • the vent hole 30 can be omitted. Then, in order to vent the mold cavity 100 while the molding material is being charged, at least one vent path formed by a working channel 60, 60 and leading from the mold cavity 100 to the outside of the core box 10 must be opened in a predetermined time interval.
  • the working channel 60, 60 ' is delimited by a circumferential surface 62, 62' which preferably has a constant cross section along a longitudinal axis 61, 6T of the working channel 60, 60 '.
  • the circumferential surface 62, 62 ' serves to guide the control element 70a, 70’a along the longitudinal axis 61, 6T.
  • the circumferential surface 62, 62 ' is interrupted in the circumferential direction by the ventilation apertures 60a, 60'a, but the effective cross section of the working channel 60, 60' remains limited by the circumferential surface 62, 62 '.
  • the area of the circumferential surface 62, 62 ' is designed as a guide surface 68'68' so that the control element 70a, 70'a can be guided in the first area 60b, 60'b in a tilt-proof manner.
  • the second region 110, 110 ′ can extend up to a predetermined distance from a connection point of the working channel 60, 60 ′ to the mold cavity 100.
  • the first region 60b, 60b can begin at the predetermined distance and extend to an outside of the box 100.
  • the controls 70, 70 ' are a means of an axially movable plate 80 at the lower ends of the controls 70, 70' is arranged a, is moved synchronously. It goes without saying that a drive unit (not shown) is provided for moving the plate 80, which drive unit can be assigned to the core box 10 or to a further device not shown.
  • the plate 80 basically enables the position of the control elements 70, 70'a to be stabilized. This increases process security.
  • the pin 70a, 70'a is axially movable in the working channel 60, 60 'between a first position in which the end area 71, 71' lies in the second area 1, 10, 10 'and a second position in which the end area 71, 71 'lies in the first area 60b, 60'b and in the first area 60b, 60'b a connection to the vent path is established.
  • the ventilation aperture 60a, 60'a is released in areas corresponding to the axial position of the pin 70a, 70'a in the working channel 60, 60 '.
  • FIG. 2 shows a sectional view of an embodiment of the device according to the invention for producing cores from molding material with two ventilation paths with a core box 10 which has a mold cavity 100 arranged in its interior and which is charged with molding material. All materials for the production of cores can be used as molding material.
  • the figure shows the device for in one operating state of a cycle, it being understood that further operating states are not excluded.
  • the core box 10 is shown in this figure in the closed state. In the open state of the core box 10, the first part 10a is spaced apart from the second part 10b. It goes without saying that a vertically arranged or a more complex separation area is also possible. It is further understood that the invention also comprises a core box with three or more parts.
  • the mold cavity 100 is also, as is known per se, for stationary venting via a vent opening 20 arranged in the second part 10b with a vent hole 30 and a vent insert 40 connected to the outside 10d.
  • the vent hole 30 can in principle, if necessary, be arranged in any area of the mold cavity 100. Furthermore, several vent holes can be provided.
  • the demolding device 70 shown in FIG. 2 comprises a working channel 60 and a further working channel 60 ' .
  • the working channel 60 is 60 'as a Entformungselement 70' a trained control 70'a allocated designed as a control Entformungselement 70a and 70a of the working channel.
  • the demolding elements 70, 70 ' a are movable in the working channel 60, 60 ' . It goes without saying that the invention also includes embodiments with only one working channel and / or only one ventilation channel and a correspondingly adapted demolding device.
  • the working channel 60 and the working channel 60 ' fluidly connect the mold cavity 100 to an outer side 10d of the second part 10b of the core box 10 and each form a venting path of the mold cavity 100.
  • the venting path can have one or more further subsections in addition to the working duct 60, 60' include. It goes without saying that the ventilation path can also be arranged transversely to the working channel 60, 60 '.
  • the working channel 60, 60 ' is delimited by a circumferential surface 62, 62' which preferably has a constant cross section along a longitudinal axis 61, 6T of the working channel 60, 60 '.
  • the circumferential surface 62, 62 ‘is used to guide the demolding element 70a, 70’a along the longitudinal axis 61, 61‘.
  • the circumferential surface 62, 62 ' is interrupted in the circumferential direction by the ventilation apertures 60a, 60'a, but the effective cross section of the working channel 60, 60' remains limited by the circumferential surface 62, 62 '.
  • the area of the circumferential surface 62, 62 ' is designed as a guide surface 68' 68 'so that the demolding element 70a, 70'a can be guided in the first area 60b, 60'b in a tilt-proof manner.
  • the working channel 60, 60 ' comprises a second area 110, 110' ', in which a relatively small venting cross section can be implemented depending on the position of the demolding element 70a, 70' a.
  • the second region 110, 110 ′ can extend up to a predetermined distance from a connection point of the working channel 60, 60 ′ to the mold cavity 100.
  • the first region 60b, 60b can begin at the predetermined distance and extend to an outside of the box 100.
  • each of the ventilation apertures 60a, 60‘a is followed by a cavity 66, 66 ', which open in the direction of the outside 10d.
  • the cavity 66 is arranged parallel to the working channel 60, 60 '.
  • the Entformungsetti 70, 70 ' are a means of an axially movable plate 80 at the lower ends of the Entformungs institute 70, 70' is arranged a, is moved synchronously. It goes without saying that a drive unit (not shown) is provided for moving the plate 80, which drive unit can be assigned to the core box 10 or to a further device not shown.
  • the demolding device 70 can be designed as an ejector device and the demolding element 70a, 70‘a as an ejector pin 70a, 70‘a.
  • the ejector pin 70a, 70‘a has a rod-shaped section with an end region 71 oriented towards the mold cavity 100.
  • the ejector pin 70a, 70'a is axially movable in the working channel 60, 60 'between a first position in which the end area 71, 71' is in the second area 1 10, 110 'and a second position in which the end area 71, 71' is in the first Area 60b, 60'b and in the first area 60b, 60'b a connection to an outlet of the ventilation path is established.
  • the Ventilation aperture 60a, 60'a released in areas corresponding to the axial position of the ejector pin 70a, 70'a in the working channel 60, 60 '.
  • the Entformungsetti 70a, 70 'a are retracted in Figure 1, to their upper end portions 71, 71' is arranged in the first region 60b, 60'b. Relatively large effective ventilation cross-sections are set in this position. In this situation, for flushing of the molding material can be a vent on the area 110, 110 'of the working channel 60, 60' and the only little of the Entformungs instituten 70a, 70 'a completed first section 60b, 60'b.
  • FIGS. 3 to 5 show a further embodiment of a part 10b of a core box of the device according to the invention in different views.
  • FIG. 3 shows part 10b of the core box in a sectional view with a demolding device 70.
  • FIG. 4 shows a perspective top view of the upper side of part 10b of the core box from FIG. 3, and
  • FIG. 5 shows a perspective top view of the underside of part 10b of the core box Figure 3.
  • the lower part 10b of the core box is shown with a part of the mold cavity 100.
  • the mold cavity 100 is connected to an outside 10d for stationary ventilation via a ventilation opening 20 arranged in the second part 10b with a ventilation bore 30 and a ventilation insert 40 .
  • the vent hole 30 can in principle, if necessary, be arranged in any area of the mold cavity 100. Furthermore, several vent holes can be provided.
  • the demolding device 70 has, for example, two demolding elements 70a, 70'a which can be moved individually in the working channel 60, 60 'along the longitudinal axis 61, 6T in the form of ejector pins which, in contrast to the previous exemplary embodiment, are not connected to a common axially movable plate. It is understood, however, that such can be present.
  • the Entformungsetti 70a, 70 'a are retracted in Figure 3, is disposed to their upper end portions 71, 7 in the first region 60b, 60'b. Relatively large effective ventilation cross-sections are set in this position. In this situation, for flushing of the molding material can be a vent on the area 110, 110 'of the working channel 60, 60' and the only little of the Entformungs instituten 70a, 70 'a completed first section 60b, 60'b.
  • a ventilation aperture 60a, 60'a is arranged in the working channel 60, 60 'in the first area 60b, 60'b, to which a cavity 66 adjoins and connects the working channel 60, 60' to the outside 10d of the part 10b.
  • the cavity 66 is arranged on the side of the working channel 60, 60 ′ facing away from the ventilation bore 30. It goes without saying that a different arrangement of the cavity 66 is also possible.
  • the ventilation aperture 60a, 60'a extends less than 180 ° around the longitudinal axis 61, 6T, so that the majority of the circumference of the demolding element 70a, 70'a is guided in the first area of the working channel 60, 60 'in a tilt-proof manner.
  • FIGS. 6 and 7 show a device according to the invention according to a further embodiment.
  • two working channels 60, 60 ' are provided by way of example, in which individually axially movable demolding elements 70a, 70'a can be moved along a longitudinal axis 61, 6T.
  • FIG. 6 shows a perspective top view of the underside of a part 10b of the device according to the invention.
  • FIG. 7 shows a sectional illustration with a demolding element 70a which can be moved axially between a first and a second position. 70‘a, without core with empty mold cavity 100.
  • the working channel (60) has at least one first area (60b) to which a subarea (114) of the ventilation path is connected, the subarea (114) at least in the connection area to the first area (60b) being inclined or perpendicular to the working channel (60 ), a guide surface (68) for the control element (70a) being arranged at least on the side of the first region (60b) facing away from the mold cavity (100).
  • the guide surface (68) is arranged in or on an element (12) arranged on the core box (10) or connected to the core box (10).
  • the element (12) arranged on the core box (10) can be designed as a closing element of the partial area (114).
  • the element 12a is a particularly preferred embodiment of the element 12.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

L'invention concerne un dispositif pour produire des noyaux (120) à partir d'une matière de moulage, comprenant une boîte à noyaux (10), une cavité de moulage (100) disposée à l'intérieur de la boîte à noyaux (10), un système d'aération (70) pour aérer la cavité de moulage (100), à laquelle est raccordé un canal de travail (60), et un élément de commande (70a) mobile dans le canal de travail (60), le canal de travail (60) formant au moins une portion (110) d'un trajet d'aération. Selon l'invention, le canal de travail (60) présente au moins dans une première zone (60b) une surface périphérique (62) qui est parallèle à un axe longitudinal (61) du canal de travail (60), la première zone (60b) présentant au moins une ouverture d'aération (60a) qui est raccordée au trajet d'aération, une surface de guidage (68) formée le long de l'axe longitudinal (61) pour l'élément de commande (70a) étant disposée dans la première zone (60b), et l'ouverture d'aération (60) s'étendant à moins de 180° autour de l'axe longitudinal (61) dans la surface périphérique (62). L'invention concerne en outre un procédé pour faire fonctionner le dispositif.
PCT/EP2019/000117 2018-04-12 2019-04-12 Dispositif et procédé pour produire des noyaux à partir d'une matière de moulage WO2020177832A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102018108735 2018-04-12
DE102019105819.8A DE102019105819B3 (de) 2018-04-12 2019-03-07 Vorrichtung zur Herstellung von Kernen aus Formstoff
DEDE102019105819.8 2019-03-07

Publications (1)

Publication Number Publication Date
WO2020177832A1 true WO2020177832A1 (fr) 2020-09-10

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Application Number Title Priority Date Filing Date
PCT/EP2019/000117 WO2020177832A1 (fr) 2018-04-12 2019-04-12 Dispositif et procédé pour produire des noyaux à partir d'une matière de moulage

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DE (2) DE202018107002U1 (fr)
WO (1) WO2020177832A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109940126A (zh) * 2019-05-05 2019-06-28 合肥江淮铸造有限责任公司 一种随形式排气顶芯杆
DE102019116531B3 (de) * 2019-06-18 2020-03-26 Krämer + Grebe GmbH & Co. KG Modellbau Vorrichtung zur Herstellung von Kernen aus Formstoff

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1980002121A1 (fr) 1979-04-04 1980-10-16 Fischer Ag Georg Procede et dispositif pour comprimer la matiere d'un moule
EP0036434A1 (fr) * 1980-03-25 1981-09-30 Eugen Dipl.-Ing. Bühler Procédé et dispositif pour comprimer des moules en fonte
EP0128974A1 (fr) 1983-06-16 1984-12-27 Harald Steffens Giessereimaschinen Machine à mouler pour la production de moules ou noyaux de sable de moulage
US5042562A (en) * 1988-03-18 1991-08-27 Eisenwerk Bruhl Gmbh Wear resistant mold part for the manufacture of molds for casting purposes
US20100122790A1 (en) * 2008-11-14 2010-05-20 Ivo Herzog Casting tool and core-making machine
DE102009031604A1 (de) * 2009-07-07 2011-01-20 Herzog & Herzog Holding Und Service Gmbh Sandgusswerkzeug
CN106424553A (zh) * 2016-12-14 2017-02-22 苏州明志科技有限公司 一种芯盒排气调整控制装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010007812B4 (de) * 2010-02-11 2017-04-20 Ksm Castings Group Gmbh Verfahren und Vorrichtung zur Herstellung von Kraftfahrzeug-Fahrwerksteilen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1980002121A1 (fr) 1979-04-04 1980-10-16 Fischer Ag Georg Procede et dispositif pour comprimer la matiere d'un moule
EP0036434A1 (fr) * 1980-03-25 1981-09-30 Eugen Dipl.-Ing. Bühler Procédé et dispositif pour comprimer des moules en fonte
EP0128974A1 (fr) 1983-06-16 1984-12-27 Harald Steffens Giessereimaschinen Machine à mouler pour la production de moules ou noyaux de sable de moulage
US5042562A (en) * 1988-03-18 1991-08-27 Eisenwerk Bruhl Gmbh Wear resistant mold part for the manufacture of molds for casting purposes
US20100122790A1 (en) * 2008-11-14 2010-05-20 Ivo Herzog Casting tool and core-making machine
DE102009031604A1 (de) * 2009-07-07 2011-01-20 Herzog & Herzog Holding Und Service Gmbh Sandgusswerkzeug
CN106424553A (zh) * 2016-12-14 2017-02-22 苏州明志科技有限公司 一种芯盒排气调整控制装置

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DE202018107002U1 (de) 2019-03-14

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